Showing papers on "Sodium sulfite published in 1984"

Disinfection of contact lenses

Abstract: A contact lens is disinfected in an aqueous H 2 O 2 solution. The H 2 O 2 solution is neutralized and transformed in situ into a buffered, saline storage solution by adding a neutralizer such as sodium sulfite or sodium thiosulfate, and optional buffering agents. The neutralizer has a coating which dissolves to release the ingredients only a period of time after it is added, so that it can be put into the H 2 O 2 solution at the same time that the lens is.

Experimental study of sulfur isotope fractionation factors between sulfate and sulfide in high temperature melts

Abstract: Sulfur isotope fractionation factors between sulfate and sulfide at 600 to 1, 000°C were experimentally determined by decomposing anhydrous Na2SO3 in melts of NaCl and LiCl-KCl mixture (6 : 4 molar ratio). Sulfur isotope exchange equilibrium was attained between sulfate and sulfide formed by decomposition of sodium sulfite within 120 minutes at 600°C in the LiCl-KCl melt and within 30 minutes at 810°C in the NaCl melt. The observed fractionation factors (α) obey the relationship in the experimental temperature range: 1000 lnαsulfate-sulfide = 7.4 × 106/T2 − 0.19. In alkali chloride melts, sulfide would exist as HS-, S2-, NaHS and NaS-, and sulfate as SO42- and NaSO4-, respectively, in an analogy with aqueous sodium chloride solution. The observed fractionation factors are considered to represent those between bulk sulfate and sulfide ions. The fractionation factor between gaseous H2S and dissolved sulfate in melt at 600 and 700°C is about 1 and 0.7‰ smaller than those between dissolved sulfide and sulfate in melt, respectively, and may be approximated by the following equation in the experimental temperature range: 1000 lnαsulfate-H2S = (6.5 ± 0.3) × 106/T2.

Emulsifiers for bituminous emulsions

Abstract: Reaction products of polyamines with certain polycarboxylic acid anhydrides are modified by reacting with formaldehyde and sodium sulfite or bisulfite, formaldehyde and phosphorus acid, haloalkane sulfonic acid salts, γ-propane sultone, haloalkane phosphoric acid, acrylic acid, fumaric acid, maleic acid and haloalkanoic acids which give emulsions capable of producing medium set mixing grade asphalt emulsions, rapid set asphalt emulsions, and quick set slurry seal emulsions. Solventless asphalts as well as asphalts containing up to 15% by volume of a hydrocarbon oil can be used for emulsification.

Amphoterics as emulsifiers for bituminous emulsions

Abstract: Novel amphoteric emulsifiers are disclosed for solventless and solvent containing mixing grade, oil-in-water anionic and cationic bituminous emulsions, which emulsifiers are the modified reaction products of polyamines with certain polycarboxylic acids and sulfonated carboxylic acids. Modifications are carried out by reacting the nitrogen-containing intermediate with formaldehyde and sodium sulfite or bisulfite, chloroalkane sulfonic acid salts, γ-propane sultone, chloroalkane phosphonic acids, acrylic acid, fumaric acid, maleic acid and chloroethanoic acid.

Process for preparing lignosulfonates

Abstract: Disclosed herein is a process for preparing sulfonated lignins by selectively isolating lignins having molecular weights greater than 5,000 and subsequently reacting the lignin with sodium sulfite and an aldehyde. The resulting sulfonated lignins are useful as dispersants for disperse dyes and vat dyes.

Dyestuff composition: disperse or vat dye and lignin sulphonate

Abstract: Improved dyestuff compositions are disclosed herein comprising, as dispersants, sulfonated lignins prepared by selectively isolating lignins having molecular weights greater than 5,000 and subsequently reacting the lignin with sodium sulfite and an aldehyde.

Degradative insertion reactions of nido-7,9-C2B9H–12.Synthesis and properties of 4-thia -6,8-dicarba-arachno-nonborane (10),4,6,8-SC2B6H10

Abstract: The reaction of 7,9-C2B9H–12(1)with NaNO2and Na2SO3in dilute hydrochloric acid affords 6,8-C2B7H13(2)and the new thiacarbaborane 4,6,8-SC2B6H10(3)the structure of which is proposed on the basis of 1H and 11B n.m.r. spectra.

Process and kit for sodium sulfite neutralization of H2O2 in contact lenses

Abstract: @ Residual H 2 O 2 remaining on a contact lens that has been disinfected in an H 2 O 2 solution is neutralized by placing the lens in a buffered saline solution which contains an effective amount of sodium sulfite. Provided is also a kit including means for washing the tenses and a source for sodium sulfite.

Straight-chain fluorine-containing anionic compound and its preparation

Abstract: NEW MATERIAL:A compound shown by the formula I [Rf is 1-20C polyfluoroalkyl, polyfluoroalkenyl, etc; Z is bifunctional connecting group; Q1 is (CH2)l (l is 1-6), (CH2)m-O-(CH2)n (m and n are 2-6), etc; R is H, 1-6C alkyl, etc; a is 0, or 1; Y is O, or S(O when a=0); Q2 is group shown by the formula II(s, t, u, and v are 0-6), etc; A is anion such as COO , SO3 , etc; M is H, or cation] USE:An anionic fluorine-containing surface active agent Useful as a foam fire extinguishant, foaming agent, etc having improved stability to change is pH PROCESS:A fluorine-containing compound shown by the formula III (X is Cl, Br, or I) is reacted with an alkali metal salt of sulfite (eg, potassium sulfite, sodium sulfite, etc) in an organic solvent at 0-150 degC for 3-25hr, to give a compound shown by the formula I (when A is SO3 and M is Na)

A modified method for determination of dehydrogenases activity of activated sludge

Abstract: Examination of the different methods employed to detect dehydrogenases activity of activated sludge by reduction of triphenyl tetrazolium chloride (TTC) indicated the non‐uniformity of the procedures. A modified method is, therefore, developed which consists of incubation of a dilute sonicated sample of mixed liquor suspended solids (MLSS) of activated sludge with TTC in the presence of sodium sulfite, phosphate buffer and cyanide. Triphenyl formazan (TF) formed is first dissolved in acetic acid and later extracted by toluene. Optical density (OD) of the color is measured at 485 nm. Dehydrogenases activity is calculated from the OD and expressed as specific activity per unit weight of protein. Modified method gave less relative dispersion compared to the values obtained on the same but unsonicated samples of MLSS.

Two stage process for sulfonating mechanical pulp fibers

Abstract: A two stage sulfonation system includes a mixing tank, a retention tank, a thickening press, a pressurized vessel, and a liquor recovery press in series relation. The system is designed to receive mechanical pulp, in a slurry form, first introduced into the mixing tank simultaneously with a metered charge of sodium sulfite solution from the holding tank, the sodium sulfite content of which is at a level from about 40 to about 200 g/l. The solution is mixed into the slurry to provide a relatively uniform and intimate contact thereof with its fiber content. This slurry is transferred to the retention tank and there held subject to a sub-boiling temperature between 140 to 210 degrees F., producing a first stage sulfonation of the fiber content. The slurry is then passed to the pressurized vessel, in the course of which it is subjected to a pressing action, extracting liquor which inherently contains a majority of the original sodium sulfite charge directed to the mixing tank. A second stage sulfonation occurs in the pressurized vessel, producing a fiber which after refining is suited for use as reinforcing pulp in newsprint or specialty grade paper, without need for addition of conventional chemical pulp.

Method for the disposal of waste water containing iron-cyanide complexes

Abstract: The invention provides an improvement in the disposal of a waste water coining iron-cyanide complexes including ferricyanides by the reduction of the ferricyanide ions into ferrocyanide in the presence of a zinc salt to precipitate the ferrocyanide ions in the form of zinc ferrocyanide. The improvement comprises the use of a sulfite, e.g. sodium sulfite, and a thiosulfate, e.g. sodium thiosulfate, in combination as the reducing agent whereby the reduction of the ferricyanide ions is complete within a relatively short time without being affected by the atmospheric oxygen or other factors.

Production of highly concentrated aqueous solution of sulfonated amino resin

Abstract: PURPOSE:To produce the titled aqueous solution excellent in storage stability, by reacting melamine, etc., with formaldehyde and a sulfite in an aqueous medium and, after adding amido-sulfonic acid, reacting the resulting reaction mixture. CONSTITUTION:A melamine-based amino group-containing substance (a substance consisting of melamine and about 0-20wt%, urea, etc. based thereon,) is reacted with formaldehyde and a sulfite (e.g., sodium sulfite) in an aqueous medium by heating for 20-60min under conditions including an NH2:CH2O:SO3 molar ratio of 1:0.9-1.1:0.3-0.4, a pH of 10-13, and a temperature of 60-80 deg.C. After adjusting the pH to 4-6 by adding amidosulfonic acid, the resulting reaction mixture is reacted at 40-60 deg.C for 50-300min and then, after adjusting the pH to 11.5-13.5, this is cooled to obtain a highly concentrated aqueous solution of sulfonated amino resin.

Study of the Disproportionation of Sodium Thiosulfate by X-Ray Photoelectron Spectroscopy

Abstract: The disproportionation of sodium thiosulfate to form sodium sulfite and elemental sulfur has been studied in the temperature range 495–548°K by means of X-ray photoelectron spectroscopy (XPS). The disproportionation started with an induction period, followed by a steady-state disproportionation rate regime, and ended up with a diffusion rate-controlling process. The duration of the induction period was inversely proportional to the temperature of heating. The disproportionation in the steady-state regime followed a first-order reaction rate law with the enthalpy and entropy of activation H* = 26.0 kcal/ mol and S* = -14.9 eu.

Production of vinyl polymer particle

Abstract: PURPOSE:To produce a vinyl polymer particles having no bubbles within particles and having a narrow particle size distribution, by suspension-polymerizing a vinyl monomer in a specified manner. CONSTITUTION:A vinyl monomer (e.g., styrene) is suspension-polymerized in the presence of a difficultly soluble phosphate as a principal suspending agent, e.g., tricalcium phosphate of a particle diameter of about 0.2-0.05mu, and an anionic surfactant as a suspending aid, e.g., dodecylbenzenesulfonate. The polymerization is started first in the presence of (i) the anionic surfactant and about 1/4-3/4 time the total of the difficultly soluble phosphate, (ii) 0.001-0.05wt%, based on the monomer, of water-soluble sulfite (or precursor thereof), e.g., sodium sulfite, is added before the conversion to polymer has reached 30wt%, and (iii) the remainder of the difficultly soluble phosphate is added when the conversion to polymer is 20-60wt% to bring the polymerization to completion.

Degradation of (+)-Cyanidanol-3 by Sodium Sulfite in Aqueous Solution. II. Reactivity of Several (+)-Cyanidanol-3 Derivatives with Sodium Sulfite

Abstract: The reactivity of several (+)-cyanidanol-3 (cianidanol) derivatives with sodium sulfite in aqueous solution was investigated at pH 7.5 and 60°C. 5, 7-O-Dimethylcianidanol was degraded by sodium sulfite to yield a water-soluble degradation product, which was assumed to be 5, 7-O-dimethylepicatechin carrying the sodium sulfonate function in place of the aliphatic hydroxy group at the C-3 position. The degradation by sodium sulfite was inhibited by the addition of boric acid and by lowering the pH of the solution to 3.0. On the other hand, 3', 4'-O-dimethylcianidanol and 5, 7, 3', 4'-O-tetramethylcianidanol were very stable in aqueous solution containing sodium sulfite. The mechanism of the attack of sulfite ion and/or bisulfite ion at the C-3 position of the dissociated form of cianidanol or 5, 7-O-dimethylcianidanol is discussed.

1-substituted-2,6-dicyanopiperidine derivative

Abstract: NEW MATERIAL:1-Substituted-2-6-dicyanopiperidine of formula I (R is phenyl, p- methoxyphenyl, benzyl) EXAMPLE: 1-Benzyl-2,6-dicyanopiperidine USE: A synthetic intermediate of medicines, agricultural chemicals and naturally occurring compounds PREPARATION: Aqueous glutaraldehyde of formula II is allowed to react with aqueous sodium hydrogen sulfite at room temperature or under cooling with ice to protect the aldehyde groups Then, an aqueous solution of aniline or benzylamine is added dropwise to the reaction mixture to effect ring closure, followed by the substitution of the sodium sulfite group in the 2,6-disodium sulfite of the 1-substituted piperidine formed with cyano group The above reaction mixture after ring closure is confirmed to be basic or neutral, then potassium cyanide is added in the form of solid at room temperature to give the compound of formula I COPYRIGHT: (C)1985,JPO&Japio

Method for delaying gelation of aequeous polymer solutions, solutions obtained by said method, and their use in oil wells

Abstract: A method has been discovered to delay the onset of gelation of partially hydrolysed polyacrylamides using polyphosphonate additives in the presence of a hexavalent chromium compound and a reducing agent. The preferred reducing agents are thiourea and sodium sulfite. By altering the temperature, pH and solution composition, high delays in gelation have been observed.

The ubiquitous sulfites.

Abstract: Sulfiting agents, including sulfur dioxide, potassium metabisulfite, sodium sulfite, sodium metabisulfite, sodium bisulfite, and potassium bisulfite, are effective antioxidants. As such they are used widely as additives in processed beverages and foods, including fruit juices, soft drinks, wines, beers, cider, vinegar, potato chips, dried fruits, and vegetables.1Their antibrowning property makes them useful in preventing spoilage of commercially prepared or displayed fresh foods such as ingredients of salad bars, dips, seafoods (particularly shrimp), fruits, and vegetables. One also encounters sulfur dioxide as a common air pollutant. Koepke et al2point out still another source of exposure—use of medications containing these substances. The irony of their observation is not lost on a profession whose guiding words areprimum non nocere. The case history they describe is of an asthma patient with presumed sulfite sensitivity whose prescribed bronchodilator contains a sulfiting agent. The adverse effects of ingested sulfiting agents in

Treatment of mercury-containing waste water

Abstract: PURPOSE:To extend the life of an adsorbent and to improve the efficiency of removing mercury by adding a reducing agent such as sodium hydrogensulfite, etc. to mercury-contg. waste water then bringing the same into contact with activated carbon deposited thereon with a sulfur compd., etc. CONSTITUTION:A sulfur compd. such as dithiocarbanic acid deriv., thiourea deriv., thiole deriv., etc. is deposited on active carbon. A reducing agent such as sodium hydrogensulfite, sodium sulfite, sulfur dioxide, ferrous chloride or the like is added to the mercury-contg. waste water discharged from a waste treating plant such as a refuse incineration plant or the like and a production plant, etc. for products associating to mercury such as caustic soda, fluorescent lamps or the like. The waste water is then brought into contact with said activated carbon to remove mercury. The amt. of the reducing agent to be used is adequately 100- 10,000mg/l in terms of a pure component by the flow rate of the waste water although said amt. varies with the kind and treating object of the waste water. The reaction time is adequately 5-30min.

Water internal paint for molding rubber product

Abstract: PURPOSE: To prevent bladder surface from deteriorating by containing sodium sulfite and/or potasium sulfite at a specified rate. CONSTITUTION: Sodium sulfite and/or potasium sulfite of 0.01W15wt% in total are/is added to water internal paint comprising liquid component, solid lubricant component, dispersant, emulsifier, thickener and water. Since this prevents sulfur from dispersing to the bladder, the bladder can restore its heat-resisting properties and elongate its life remarkably. COPYRIGHT: (C)1985,JPO&Japio

Conditioner for muddy water for boring

Abstract: PURPOSE:To provide the titled muddy water conditioner which consists of a complex compd. of sulfoalkylated humic acid (or sulfoalkylated lignite), a zirconium compd. and an iron compd. and is suitable for boring of well for petroleum, natural gas, terrestrial heat, etc. CONSTITUTION:About 0.5-80pts.wt. zirconium compd. (e.g. zirconium sulfate) and iron compd. (e.g. ferric sulfate heptahydrate) are added to 100pts.wt. sulfoalkylated humic acid (obtained by sulfoalkylating humic acid with a water- soluble carbonyl compd. such as formaldehyde and sodium sulfite) or sulfoalkylated lignite (obtained by sulfoalkylating lignite in the same manner as above). Water is added to the mixture under stirring for reaction and the resultant complex compd. is used as muddy water conditioner. (Polyacrylic acid and sulfuric acid may also be added.)

Rinsing acceleration liquid for photography

Abstract: PURPOSE:To obtain a stable rinsing acceleration liquid for photography by which decomposition of sulfite ion is suppressed by adding a bishydroxyethyl-ethylenediaminediacetic acid (salt) to a compd. which releases the sulfite ion. CONSTITUTION:The bishydroxylethyl-ethylenediaminediacetic acid or its salt specified by the formula (H and an alkali metal such as Na, K or the like, NH4, etc.) is added to a compd. which releases sulfite ion (e.g.; sodium sulfite, ammonium bisulfite, etc.). A rinsing acceleration liquid for photography by which the decomposition of the sulfite ion is suppressed, and which is lessened in the deterioration in the effect of accelerating rinsing owing to aging after the prepn. of the liquid and has high stability with age is obtd.