Showing papers on "Isopropyl alcohol published in 2002"
TL;DR: In this article, the effects of temperature, pressure and the addition of co-solvent (ethanol (EtOH) and isopropyl alcohol (IsoC3), both at 1.17% (mass)) on the kinetics of extraction of ginger oleoresin were studied.
Abstract: The effects of temperature, pressure and the addition of co-solvent (ethanol (EtOH) and isopropyl alcohol (IsoC3), both at 1.17% (mass)) on the kinetics of extraction of ginger oleoresin were studied. The design used was a 2×2×3 factorial (pressure 200 and 250 bar; temperature: 25 and 35 °C; solvent: CO2, CO2+EtOH, CO2+IsoC3). The experimental setup used was a fixed bed extractor with diameter of 2.76×10−2 m and length of 0.387 m. The assays were carried out at a mean solvent flow rate of 5.86×10−5 kg/s and with a bed apparent density of 350 kg/m3. The identification of the substances present in the oleoresin was performed by GC-MS; GC-FID was used to determine the ginger extract compositions. The antioxidant activity of the extract fractions was determined using the coupled oxidation of linolenic acid and β-carotene. The results show that the temperature and the interaction of the pressure and the solvent significantly affected the total yield. For the mass transfer rate, the effect of the interaction of the pressure and the solvent was significant; the mass transfer rate increased with the pressure in the absence of the co-solvent and decreased when ethanol and isopropyl alcohol were used. The major substances present in the ginger extracts were α-zingiberene, gingerols and shogaols; the amounts of these compounds were significantly affected by temperature, pressure and solvent. Nonetheless, the antioxidant activity of the ginger extracts remained constant at ≈80% and decreased to ≈60% in the absence of gingerols and shogaols. The Sovova's model quantitatively described the overall extraction curves.
229 citations
TL;DR: In this paper, different alcohol additives to KOH solution have been studied and it was stated that the alcohols result in changing silicon etching anisotropy and caused deterioration of surface finish.
Abstract: Different alcohol additives to KOH solution have been studied. It was stated that the alcohols result in changing silicon etching anisotropy. The alcohols with one hydroxyl group exhibited similar effect as isopropyl alcohol. They caused strong reduction of etch rates of (h h 1) type planes, usually developing at the side-walls of etched convex figures. This was the reason of the reduction of convex corner undercut. The alcohols with more than one hydroxyl group did not influence the etching anisotropy and caused deterioration of surface finish. The connection of alcohol properties with (h h 1) etch rate reduction have been analysed. It has been stated that the advantageous effect of the alcohols from propanol and butanol groups is connected with their low surface tension.
95 citations
Patent•
10 Jun 2002
TL;DR: Wide spectrum disinfecting and antiseptic composition for use in the fields of human medicine, veterinary science and industry, characterized because it includes: Hydrogen peroxide, lactic acid and halogen salts (Br, I) with surfactant agents, either cationic, like chlorhexidine and/or quaternary ammonium salts, like didecyl-methyl-polyoxy-ethyl-ammonium propionate, together with excipients, some of which may be ethyl or isopropyl alcohol as mentioned in this paper.
Abstract: Wide spectrum disinfecting and antiseptic composition for use in the fields of human medicine, veterinary science and industry, characterized because it includes: Hydrogen peroxide, lactic acid and halogen salts (Br, I) and/or salts of heavy metals (for example, silver halides) with surfactant agents, either cationic, like chlorhexidine and/or quaternary ammonium salts, like didecyl-methyl-polyoxy-ethyl-ammonium propionate, chlorides of ammonium or compounds of ammonium propylamide or anionic, like lauryl sulphate, dodecyl sulphate or alkyl succinic salts, with suitable excipients, some of which may be ethyl or isopropyl alcohol, chlorhexidine, non-chlorinated quaternary ammonium salts, like didecyl-methyl-polyoxy-ethyl-ammonium propionate, combined or not with iodine, and/or its salts, together with excipients, some of which may be ethyl or isopropyl alcohol.
72 citations
TL;DR: Palygorskite clays containing 2, 4, 6 or 10% lanthanum (w/w) were prepared by ion exchange from acid-leached natural clays as mentioned in this paper.
53 citations
TL;DR: In this paper, a flow sheet has been developed for the application of catalytic distillation technology to the production of isopropyl alcohol (IPA) by hydration of propylene.
Abstract: A novel process flow sheet has been developed for the application of catalytic distillation technology to the production of isopropyl alcohol (IPA) by hydration of propylene. Operation of the catalytic distillation column has been simulated using an equilibrium-stage model for the distillation sections and an equilibrium-reaction model for the catalytic sections. High-purity IPA (99.9mol%) is produced as a liquid product stream from a catalytic distillation column having dual catalyst beds, operating at a pressure of 2 MPa.
32 citations
TL;DR: In this paper, the effects of collets versus flake with hexane and IPA as extraction solvents at various alcohol concentrations (88, 93, 95 and 97% IPA levels) were examined.
Abstract: Isopropyl alcohol (IPA) is one of the most favorable alternatives to hexane for oil extraction. Compared to hexane and other solvents such as ethanol, IPA is less flammable and less toxic and is free of restrictive governmental regulations. Thus, the effects of collets versus flake with hexane and IPA as extraction solvents at various alcohol concentrations (88, 93, 95 and 97% IPA levels) were examined. Cottonseed meats were flaked and cooked before they were processed using a Hivex expander. The solvent extractions were carried out using a seven-stage countercurrent laboratory extraction unit. Extractability of collets with 95% IPA was better than that of flakes. The residual oil content and solvent hold-up of the collets were 1.6 and 33.0% compared 4.5; and 53.2% for the flakes, respectively. The aqueous IPA extraction proceeded more slowly and showed a lower oil carrying capacity than that of hexane. The residual oil content of the cottonseed collets extracted with hexane was 1.2% while the solvents containing 97, 93, and 88% IPA resulted in 1.5, 1.9, and 2.4%, respectively. Reduction in water content improved the extraction efficiency of IPA.
29 citations
TL;DR: 1,2,3-triazole reacts with isopropyl alcohol in concentrated sulfuric acid to yield 1-isophropyl-1H-1, 2, 3, 4, 5 triazole as the only reaction product.
18 citations
TL;DR: In this article, the isopropyl alcohol complex [2,3,4,5-Ph4(η4-C4CO)](CO)2Ru(H2NCHMe2) (4a) was shown to be an isopropylamine complex.
18 citations
TL;DR: Protein of endosperm of maize grains originating from three wild-type inbreds and their opaque-2 versions were solubilized in diverse extracts (E) by the sequential use of 0.5 M NaCl, water, alcohol, and salt plus a reducing agent and the presence of zeins was revealed.
Abstract: Protein of endosperm of maize grains originating from three wild-type inbreds and their opaque-2 versions were solubilized in diverse extracts (E) by the sequential use of 0.5 M NaCl, water (E1,2), alcohol plus a reducing agent (E3), and salt plus a reducing agent (E4). Zeins were isolated in extracts E3 and E4 obtained by using 55% (w/w) isopropyl alcohol (i-PrOH) + 0.2% dithiothreitol (DTT) followed by 0.5 M NaCl + 0.2% DTT buffered at pH 10 or 60% tert-butyl alcohol (t-BuOH) + 0.2% DTT followed by 0.5% sodium acetate + 0.2% DTT in 30% t-BuOH. For a given genotype the percentage of extracted zeins was independent of the nature of the alcohol. The latter had a slight effect on the respective magnitude of E3 and E4: E3 increased at the expense of E4 when t-BuOH was substituted to i-PrOH for their isolation. The percentage of the total endosperm nitrogen present in E3 + E4 was identical to that of fractions FII + FIII + FIV isolated according to the classical Landry−Moureaux extraction procedure. SDS-PAGE...
17 citations
TL;DR: Catalytic amounts of glucose oxidase from Aspergillus niger (GO) are active in the reduction of O2 to H2O2 in the presence of irradiated suspensions of TiO2 and isopropyl alcohol as electron donor, which has a marked positive effect on both the oxidation of isoproyl alcohol to acetone and the formation of radical intermediates.
Abstract: Catalytic amounts of glucose oxidase from Aspergillus niger (GO) are active in the reduction of O2 to H2O2 in the presence of irradiated suspensions of TiO2 and isopropyl alcohol as electron donor. An explanation of this behaviour is given on the basis of the ability of the enzyme to capture electrons from the photoexcited TiO2 instead of its natural substrate, glucose. This process has a marked positive effect on both the oxidation of isopropyl alcohol to acetone and the formation of radical intermediates, which have been detected, for the first time, by EPR-spin trapping investigation.
15 citations
TL;DR: The concentration of the hydroxide ion and the parent molecules decreased with the dose, while that of the halide ions and the organic products, with less halogen atoms than the parent, increased as mentioned in this paper.
TL;DR: In this article, the catalytic activity of H-ZSM-5 was investigated in the synthesis of N -isopropylacrylamide from acrylonitrile.
TL;DR: In this article, the authors investigated the effect of Cr addition on the performance of the Mo/HZSM-5 catalyst and found that much higher methane conversion was obtained over Mo-Cr/HzSM-1 catalyst than over Mo/CZSM5 catalyst.
Abstract: The promotional effect of Cr addition on the methane aromatization performance of the Mo/HZSM-5 catalyst was investigated. It was found that much higher methane conversion was obtained over Mo–Cr/HZSM-5 catalyst than over Mo/HZSM-5. The results indicate that when the Cr/Mo molar ratio is 0.07, the methane conversion and aromatics selectivity reach 11.6 and 97.3% respectively at a reaction temperature of 973 K. Raising the temperature is beneficial to the methane conversion and 15.82% conversion is obtained at 1023 K. Modern measurements such as isopropyl alcohol decomposition and temperature desorption of ammonia (NH3-TPD) were used to characterized the catalysts. The results of isopropyl alcohol decomposition show that the surface acidity of Mo–Cr/HZSM-5 is increased at high temperature. The NH3-TPD findings imply that the Mo–Cr/HZSM-5 catalyst has much stronger acidity and more acid sites than Mo/HZSM-5, most likely one of the reasons for the enhanced activity for methane aromatization using Mo–Cr/HZSM-5 catalyst.
Patent•
03 Sep 2002TL;DR: In this article, a process of concomitant scouring and oxidizing cellulose in a solution of nitrogen oxide and perfluorinated hydrocarbon and subsequent washings of the oxidized fabric with isopropyl alcohol is described.
Abstract: The present invention is directed to a process of concomitant scouring and oxidizing cellulose in a solution of nitrogen oxide and perfluorinated hydrocarbon and subsequent washings of the oxidized fabric with isopropyl alcohol, where the perfluorinated hydrocarbon solvent preferably has a boiling point in the range of between about 30° C. and about 100° C., the nitrogen oxide concentration in the solution is in the range between about 2% and about 12% by weight, the reactants are maintained at a temperature between about 25 ° C. to about 40° C. for a total time duration of at least about 7 hours, the oxidized cellulose is subsequently washed with Fluorinert solvent, cold water, 50:50 isopropyl alcohol:water and 100% isopropyl alcohol, followed by drying with warm nitrogen gas. The resulting oxidized fabric exhibits a residual oil content substantially equivalent to fabric that has been scoured in hot aqueous and detergent but does not suffer the shrinkage associated with aqueous scouring.
TL;DR: In this article, the alkylation of benzene with isopropyl alcohol was studied in an integral pressure reactor over silicon substituted aluminophosphate molecular sieves, SAPO-5.
Abstract: The alkylation of benzene with isopropyl alcohol was studied in an integral pressure reactor over silicon substituted aluminophosphate molecular sieves, SAPO-5. The influence of various process parameters such as temperature, pressure, time on stream, weight hourly space velocity, and mole ratio of reactants on cumene yield and selectivity were investigated. The activity of SAPO-5 was compared with that of Hbeta for this reaction under similar conditions and in the same reactor. At pressures higher than atmospheric, almost the theoretical maximum yields of cumene were achieved on this SAPO-5. Among the diisopropyl benzenes formed by the alkylation of cumene, the meta-isomer was found to form in a significant amount followed by the para-isomer. The ortho-isomer with relatively high strain energy of 4.26 kcal/mol was almost negligible. The cumene yield goes through a maximum in the temperature range 498-543 K studied. Cumene selectivity was found to decrease at higher temperatures, higher pressures and lower benzene to isopropanol mole ratios.
Patent•
13 Feb 2002
TL;DR: The composite scavenger for super large scale IC chip consists of nonyl phenol polyethenoxy ether, coconut oil diethanolamide, oxypropylene oxyethylene glycerin ether betaine type surfactant, amino acid surfactants, EDTA, citric acid, iodine, isopropyl alcohol, ethanol, ethanolamine and deionized water.
Abstract: The composite scavenger for superlarge scale IC chip consists of nonyl phenol polyethenoxy ether, coconut oil diethanolamide, oxypropylene oxyethylene glycerin ether betaine type surfactant, amino acid surfactant, EDTA, citric acid, iodine, isopropyl alcohol, ethanol, ethanolamine and deionized water. It is prepared through ion exchange to purity the components to MOS purity, mixing, recompounding, stirring, defoaming, and filtering. It may be used to replace sulfuric acid, nitric acid, hydrochloric acid, hydrogen peroxide, ammonia water and other chemicals in traditional scavenger and has similar cleaning effect but greatly reduce cost. It has no toxicity, no corrosion, no harm to human body and no environmental pollution.
Patent•
25 Nov 2002
TL;DR: In this article, a heat exchanger that is coated with hydrophilic, deodorizing and antibacterial coating is provided, which can oxidize odorous sources without sunlight of ultraviolet spectrum by metal ion substitution.
Abstract: PURPOSE: A heat exchanger that is coated with hydrophilic, deodorizing and antibacterial coating is provided, which can oxidize odorous sources without sunlight of ultraviolet spectrum by metal ion substitution. CONSTITUTION: The method for fabricating a coating of heat exchanger includes the steps of preparing a photoconductive ceramics composite comprising (i) TiO2 0.57 mol/L prepared by using titanium isopropoxide £Ti(OCH(CH3)2)4| and isopropyl alcohol £(CH3)2CHOH|, (ii) SiO2 0.44 mol/L prepared by using tetraethyl orthosilicate tetraethoxysilane (C8H20O4Si) isopropyl alcohol £(CH3)2CHOH|, (iii) ZnO 0.5 mol/L prepared by using Zn acetate £Zn(C2H3O2)2| and (iv) silver, wherein weight percent of each component is TiO2 50 %, SiO2 40 %, ZnO 9 % and silver 1 %; mixing the photoconductive ceramics composite with a hydrophilic coating solution; applying the mixture solution on heat exchanger; and drying the coat at less than 300 deg.C.
TL;DR: In this article, various materials consisting of magnesium (mMgPO) or aluminium phosphates (mAlPO) were synthesized from microemulsions and characterized in structural terms using X-ray diffraction (XRD), energy dispersive Xray analysis (EDAX), thermal analysis, and solid-state 31 P and 27 Al NMR spectroscopies.
Abstract: Various materials consisting of magnesium (mMgPO-1 and mMgPO-2) or aluminium phosphates (mAlPO-1 and mAlPO-2) were synthesized from microemulsions and characterized in structural terms using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), thermal analysis, and solid-state 31 P and 27 Al NMR spectroscopies. The morphology of the solids was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and their surfaces properties were determined from N 2 adsorption–desorption isotherms. The new materials thus prepared are structurally and compositionally similar to solids obtained by precipitation from solutions; their specific surface areas, however, are substantially greater and their pore size distribution more narrow. The catalytic activity of the materials in the dehydration–dehydrogenation of isopropyl alcohol was found to be similar to or greater than that of catalysts obtained by precipitation from aqueous solutions. The magnesium orthophosphates yielded acetone (the major product) and propene from 2-propanol; the aluminium orthophosphates, which possess dehydrating activity only, yielded propene alone.
Patent•
18 Dec 2002
TL;DR: In this article, a method for manufacturing fine nickel powder with a particle size distribution of 100 to 1000 nm using liquid reaction method is provided, which includes the steps of reacting a neutralizing agent with one metal precursor selected from (Ni(NO3)2·6H 2O), (NiCl2x·H2O) and (NiSO4·6HO) in aqueous solution to obtain precipitates; solving the precipitates in an organic solvent; treating above slurry at 200 to 300 deg.C under a pressure of 0.1 to 4 MP
Abstract: PURPOSE: A method for manufacturing fine nickel powder with a particle size distribution of 100 to 1000 nm using liquid reaction method is provided. CONSTITUTION: The method includes the steps of reacting a neutralizing agent with one metal precursor selected from (Ni(NO3)2·6H2O), (NiCl2x·H2O) and (NiSO4·6H2O) in aqueous solution to obtain precipitates; solving the precipitates in an organic solvent; treating above slurry at 200 to 300 deg.C under a pressure of 0.1 to 4 MPa to obtain fine metal powder; and extracting the organic solvent from the obtained fine metal powder by using solvents such as ethanol, acetone, isopropyl alcohol a methanol. The method is characterized in that the neutralizing agent is selected from KOH, NaOH and NH4OH; the organic solvent is selected from ethylene glycol, polyethylene glycol and butanediol.
Patent•
16 Oct 2002
TL;DR: An improved isopropyl alcohol compound contains cooling, itch-relieving, antibacterial, antifingal and deodorizing properties and herbal fragrance of pure, natural peppermint oil as mentioned in this paper.
Abstract: An improved isopropyl alcohol compound contains the cooling,.soothing, itch-relieving, antibacterial, antifingal and deodorizing properties and herbal fragrance of pure, natural peppermint oil. Its ideal uses are for foot deodorizing and therapy, sanitizing and deodorizing the insides of shoes and various surfaces, for oily hair and scalp and dandruff therapy, spa treatment massage, and the removal of body perspiration and odor in areas that are not sensitive to isopropyl alcohol. The compound is identifiable from other alcohol compounds by its pink color, produced by small amounts of FD&C natural liquid colorings.
Patent•
23 Apr 2002
TL;DR: In this paper, a method for producing isopropyl alcohol from acetone and hydrogen is proposed, by which the highly pure isopro-pyl alcohol can be produced using crude acetone, a process liquid of an acetone production process without positively using highly purified acetone.
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing isopropyl alcohol, comprising obtaining the isopropyl alcohol from acetone and hydrogen, by which the highly pure isopropyl alcohol can be produced using crude acetone, a process liquid of an acetone production process, without positively using highly purified acetone. SOLUTION: This method for producing the isopropyl alcohol, comprising reacting the acetone with the hydrogen, characterized in that the total amount of aldehydes, alcohols and ketones (excluding the acetone) in the acetone of raw material is <=0.3 wt.%.
Patent•
20 Feb 2002
TL;DR: In this article, a mixture of a surfactant, a transdermal absorption promotor, a water-solubilization of lidocaine, and a polyoxyethylene castor oil such as cremophor is used to obtain a soft, agreeable to the touch and easy to wash without irritation when applied to the skin.
Abstract: PURPOSE: Hydrogel obtained by solubilization of lidocaine to a mixed solution of a surfactant, a surfactant aid and oils, adding to an aqueous phase and then adding a water soluble polymer and a transdermal absorption promotor is provided, which has the advantages of being soft, agreeable to the touch and easy to wash without irritation when applied to the skin. CONSTITUTION: The pharmaceutical composition contains 5 to 30% by weight of one selected from Tween having an HLB value of 10 or more and polyoxyethylene castor oil such as cremophor as a surfactant, 5 to 30% by weight of one selected from ethanol, benzyl alcohol, isopropyl alcohol as a surfactant aid, 5 to 30% by weight of one selected from isopropyl myristate, labrafac CC, Labrafil M1944CS, labrafac lipophile and Labrafil WL2609BS as oils, 0.1 to 5% by weight of one selected from carbopol, sodium alginate and carboxymethylcellulose as a water soluble polymer, 1 to 20% by weight of one selected from ethyl digol, isopropyl alcohol and oleic acid as a transdermal absorption promotor and 40 to 80% by weight of water or purified water.
TL;DR: In this paper, the radiation-chemical reduction of Ru(III) was studied in aqueous RuCl3 solutions containing isopropyl alcohol, and the stable colloids of ruthenium were formed with spherical particles 4-8 nm in diameter.
Abstract: The radiation-chemical reduction of Ru(III) is studied in aqueous RuCl3 solutions containing isopropyl alcohol. In the presence of sodium polyacrylate, the stable sols of metal are formed with spherical particles 4–8 nm in diameter. The optical spectrum of nanoparticles is characterized by an increasing absorption in the UV spectral region with no maximum (e200 = 7.2 × 1030 l mol–1 cm–1). The colloids of ruthenium in an aqueous solution are stable in the open air.
Patent•
01 Feb 2002
TL;DR: In this paper, an alcohol-based fuel composition of the present invention has approximately equal power to gasoline while exhibiting reduced exhaust emission and credible engine start-up even at low temperature conditions.
Abstract: PURPOSE: An alcohol-based fuel composition of the present invention has approximately equal power to gasoline while exhibiting reduced exhaust emission and credible engine start-up even at low temperature conditions. CONSTITUTION: The alcohol-based fuel composition comprises 35-55wt.% of ethanol/methanol, 5-15wt.% of isopropyl alcohol, 5-15wt.% of butanol, 25-45wt.% of toluene, 1-10wt.% of non aromatic raffinate, and further 1-20wt.% of isopentene.
Patent•
18 Dec 2002
TL;DR: In this paper, a simple preparation method of high purity and fine titanate(TiO2) powder by a dissolution method using ethylene glycol is provided to save production costs and increase yield of TiO2 powder.
Abstract: PURPOSE: A simple preparation method of high purity and fine titanate(TiO2) powder by a dissolution method using ethylene glycol is provided to save production costs and increase yield of TiO2 powder. CONSTITUTION: The preparation method of TiO2 powder comprises the steps of: (i) dissolving titanium isopropoxide or titanium isopropoxide(Ti(OC3H7)4) and metal nitrate as metal cations into ethylene glycol at 60-80deg.C, where the weight ratio of metal cations and ethylene glycol is 1:1-1:8, and metal nitrate is one compound selected from Ba(NO3)2, Sr(NO3)2, Al(NO3)3, Dy(NO3)3 and Ca(NO3)2: (ii) drying the solution at 100-120deg.C to form gel type precursors; (iii) calcining at 600-700deg.C and crystallizing at 700-900deg.C, resulting in TiO2 powder with 5.3-14.3m¬2/g surface area and 0.8-20micrometer size; (iv) wet ball-milling formed TiO2 powder in the medium of isopropyl alcohol to get fine TiO2 with a narrow particle size distribution, 14-25m¬2/g surface area and 0.04-1.2micrometer size.
TL;DR: FIGURE.
Abstract: FIGURE. Decrease in colony-forming units (CFU) after application of 2% chlorhexidine gluconate in 70% isopropyl alcohol on the abdomen. REFERENCES 1. Higgins S, Walls E, Fisher A, Smith D, Humphries T. The establishment and validation of the mobile immunization team concept at a clinic level. Mil Med 1991;156:53-55. 2. Subbarao K. Influenza vaccines: present and future. Adv Virus Res 1999;54:349-373. 3. Beguin C, Boland B, Ninane J. Health care workers: vectors of influenza virus? Low vaccination rate among hospital health care workers. Am J Med Qual 1998;13:223-227. 4. Szucs T. The socio-economic burden of influenza. / Antimicrob Chemother 1999;44: 11-15. 5. Walls C. Reasons that healthcare workers decline influenza vaccination in a New Zealand hospital environment. Infect Control Hosp Epidemiol 2000;21:249-250. Letter.
Patent•
18 May 2002
TL;DR: In this paper, a chitosan derivative, its preparation method using amino acids or organic acids and its use are provided, wherein chitoshan derivative is improved in the antibacterial activity and the water solubility.
Abstract: PURPOSE: A novel chitosan derivative, its preparation method using amino acids or organic acids and its use are provided, wherein chitosan derivative is improved in the antibacterial activity and the water solubility. CONSTITUTION: The chitosan derivative is represented by the formula I or II, wherein n is a degree of polymerization of 0-10,000, and a degree of acetylation is 20-100. The preparation method comprises the steps of protecting the acid group by using an amino acid or an organic acid or reacting the N-formyl amino acid derivative with chitosan; and reducing the obtained compound by using alkyl amide or by hydrogenation. The N-formyl amino acid derivative is prepared by the formylation of an amino group using acetic acid or formic acid. The solvent is selected from the group consisting of methanol, ethanol, acetonitrile, isopropyl alcohol, acetic acid, lactic acid, HCl and their mixtures.
Patent•
29 Apr 2002
TL;DR: Disclosed as discussed by the authors is a stripping composition for removing resist, comprising 5-50% by weight of at least one product obtained from the reaction of alkyl acetoacetate or acetic acid with fatty acid amine, and 50-95% of a solvent selected from the group consisting of water, an aqueous 25 wt % tetramethyl ammonium hydroxide solution, glycol, and organic polar solvents.
Abstract: Disclosed is a stripping composition for removing resist, comprising 5-50% by weight of at least one product obtained from the reaction of alkyl acetoacetate or acetic acid with fatty acid amine, and 50-95% by weight of a solvent selected from the group consisting of water, an aqueous 25 wt % tetramethyl ammonium hydroxide solution, glycol, and organic polar solvents. The stripping composition is so excellent in terms of stripability as to require only a rinsing process with ultra-pure water without passing through a stripping composition removal process with an air knife and a rinsing process with isopropyl alcohol. Also, with low volatility and toxicity, the composition produces as little pollution of the environment as possible, in addition to not encroaching on metal undercoats and pipe substrates such as O-rings, even without corrosion preventives.
Patent•
20 Aug 2002
TL;DR: In this article, a mixture of butylcelvosolve and isopropyl alcohol is used for acid treatment to increase the penetrating capacity of acid composition into low-permeability formation and to remove spent solution and reaction products from treatment zone.
Abstract: oil and gas producing industry SUBSTANCE: method includes successive injection of reagent and buffer fluid into formation Buffer fluid is used in form of mutual solvent and reagent in form of acid composition with mutual solvent Prior to injection of reagent, buffer fluid is injected treatment is carried out in dynamic conditions without letting stand for reaction with no stopping at stages of injection and completion and also between them Acid composition is used in form of butylcelvosolve, or its mixture with isopropyl alcohol EFFECT: higher efficiency of acid treatment due to increase of penetrating capacity of acid composition into low-permeability formation and fuller removal of spent solution and reaction products from treatment zone 3 cl