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Showing papers on "Activated alumina published in 1978"



Patent
26 May 1978
TL;DR: The method of preparing granulated activated alumina consists in that alumina trihydrate is decomposed by bringing it in contact with a bed of a solid heat carrier having the temperature of 350° to 600° C, the contact time being from 0.05 to 0.5 second, to obtain a product of decomposition in the form of amorphous aluminium hydroxide as mentioned in this paper.
Abstract: The method of preparing granulated activated alumina consists in that alumina trihydrate is decomposed by bringing it in contact with a bed of a solid heat carrier having the temperature of 350° to 600° C., the contact time being from 0.05 to 0.5 second, to obtain a product of decomposition in the form of amorphous aluminium hydroxide. Said decomposition product is mixed with water into a suspension having the concentration of 100-500 g/liter, calculating with reference to aluminium oxide, and hydrated at a temperature of 20°-100° C. and the pH of 5 to 12 for 0.5 to 10 hours. The hydrated decomposition product is then treated with an acid, that can form water-soluble basic salts of aluminium, at a temperature of 20° to 150° C., granulated, dried at a temperature of 20° to 150° C., and calcined at a temperature of 400° to 600° C. The granulated activated alumina can be used as an adsorbing material, as a catalyst, or a support for active components in chemical and petrochemical industry.

27 citations


Patent
John R. Dodd1
21 Aug 1978
TL;DR: In this paper, the authors present a process for preparing 1-methylnaphthalene and 2-methyl naphthalenes in the vapor phase at elevated temperatures and optionally under pressure in the presence of activated alumina catalyst.
Abstract: Broadly, the present invention is directed to a process for preparing 1-methylnaphthalene and 2-methylnaphthalene wherein the process comprises reacting naphthalene and methanol in the vapor phase at elevated temperatures and optionally under pressure in the presence of an effective amount of activated alumina catalyst. In a preferred embodiment the invention is directed to a process for preparing 2-methylnaphthalene in high selectivity by reacting naphthalene and methanol in the vapor phase at elevated temperatures in the range of about 500° to about 650° C. in the presence of an effective amount of activated alumina catalyst.

20 citations


Patent
10 Apr 1978
TL;DR: In this paper, a gasoline boiling range hydrocarbon stream obtained by fractionation of overhead vapors from a delayed coker is treated for removal of organic silicon compounds prior to being processed in a desulfurizer and catalytic reformer.
Abstract: A gasoline boiling range hydrocarbon stream obtained by fractionation of overhead vapors from a delayed coker is treated for removal of organic silicon compounds prior to being processed in a desulfurizer and catalytic reformer. The stream is treated by a bed of material such as alumina, activated alumina or spent alumina-based desulfurizer catalyst at elevated temperature to reduce the level of organic silicon compounds. The organic silicon compounds, if not removed, are detrimental to desulfurizer and reformer catalysts. The organic silicon compounds are conventionally added to a delayed coker to control foaming.

20 citations


Patent
31 Mar 1978
TL;DR: In this article, a mixture is prepared by mixing alumina sol and activated alumina which contains not less than 60 Wt % of delta-alumina and then the mixture is thereafter coated on a relatively small specific surface area monolithic catalyst carrier.
Abstract: A mixture is prepared by mixing alumina sol and activated alumina which contains not less than 60 Wt % of delta-alumina. The mixture is thereafter coated on a relatively small specific surface area monolithic catalyst carrier. After being dried, the coated carrier is fired to give a high specific surface area catalyst carrier.

19 citations


Patent
03 Nov 1978
TL;DR: In the presence of a high surface area activated alumina containing a relatively low amount of sodium oxide (Na2 O) to form 1-olefin, it is used as a catalyst for the isomerization of isomeric n-butenes as discussed by the authors.
Abstract: Aliphatic monoolefins which can be normal or branched are isomerized at temperatures in the approximate range 500°-1200° F. in presence of a high surface area activated alumina containing a relatively low amount of sodium oxide (Na2 O) to form 1-olefin. Generally, from about 0.13 to about 0.39 milliequivalents of Na2 O per gram of the activated alumina containing the Na2 O, supplied by such sodium compounds as are disclosed, the activated alumina having a large surface area, i.e., about 300-400 m2 per gram, is used as a catalyst for the isomerization of, say, isomeric n-butenes. Generally, the olefin treated will have from 4 to about 20 carbon atoms per molecule.

17 citations


Journal ArticleDOI
TL;DR: In this article, water was added to alumina samples following their activation in vacuo at both 723 and 1023 K. Reactions of [2H0]propene and of CD2CH-CH3 were then studied on these catalysts.
Abstract: Water was added to alumina samples following their activation in vacuo at both 723 and 1023 K. Reactions of [2H0]propene and of CD2CH—CH3 were then studied on these catalysts. Adsorption of water (2.7 × 1018 molecule m–2) at ∼300 K is molecular and serves only slightly to poison catalytic activity at ∼300 K. Adsorption of water at > 453 K occurs dissociatively and completely poisons those sites on the fresh catalyst surface which promote reactions at ∼300 K. Reaction of propene occurs on such a water poisoned catalyst at ∼483 K and proceeds with incorporation of D+(from D2O) through an associative mechanism involving carbonium ions, in contrast to a dissociative mechanism at a reaction temperature of 300 K on an unpoisoned catalyst. Water “added-back” to activated alumina at > 453 K is therefore effective in producing Brϕnsted acid centres on the surface and it is suggested that residual hydroxyls, those left following activation, can also participate in carbonium ion formation from propene at > 453 K. Therefore, not only is the activity of alumina strongly influenced by its activation temperature but it is also determined by the temperature used for subsequent alkene catalysis.

6 citations


Patent
Hsiun P. Hsieh1
20 Sep 1978
TL;DR: In this article, an improved process for dispersing alumina trihydrate in a polyester resin is disclosed wherein the improvement comprises reducing the times required to accomplish the gelling and curing of polyester resins by blending two to ten percent activated alumina, based on the total weight of alumina with the alumina trhydrate.
Abstract: An improved process for dispersing alumina trihydrate in a polyester resin is disclosed wherein the improvement comprises reducing the times required to accomplish the gelling and curing of a polyester resin by blending two to ten percent activated alumina, based on the total weight of alumina, with the alumina trihydrate.

5 citations


Patent
07 Jun 1978
TL;DR: In this article, a ternary catalyst exhibiting exhaust gas treating power regardless of sharp fluctuations in exhaust gas components by supporting a Ce component on activated alumina followed by calcination and support of Rh or Rh and one or more kinds of other platinum group metals.
Abstract: PURPOSE:To provide a durable ternary catalyst exhibiting exhaust gas treating power regardless of sharp fluctuations in exhaust gas components by supporting a Ce component on activated alumina followed by calcination and support of Rh or Rh and one or more kinds of other platinum group metals. CONSTITUTION:Activated alumina carrier is impregnated with a 0.01-1.0 mol/l aq. soln. of a Ce cpd. such as Ce(NO3)3 and calcined at above 600 deg.C, esp. above 1000 deg.C. The amt. of Ce supported is 0.01-1.0 mol per liter of carrier. The Ce- supported carrier is then impregnated with an aq. soln. of Rh salt or Rh and other platinum group metal salts and calcined at above 600 deg.C to prepare a desired exhaust gas cleaning catalyst. It is desirable to support 0.1 g of Rh and above 0.2 g of other platinum group metals to 1 l of the carrier.

5 citations


Patent
27 Dec 1978
TL;DR: In this article, a honeycomb type oxidation catalyst of long life and high activity for purification of exhaust gases from internal combustion engines by supporting a heavy metal and activated alumina on a specified carrier in a predetermined wt. ratio was presented.
Abstract: PURPOSE:To obtain a honeycomb type oxidation catalyst of long life and high activity for purification of exhaust gases from internal combustion engines by supporting a heavy metal and activated alumina on a specified carrier in a predetermined wt. ratio and specifying the thickness of the catalyst layer and the grain size distribution of the activated alumina fine powder used.

3 citations


Patent
26 Jun 1978
TL;DR: In this article, a sophorolipid derivative is heated and stirred in the presence of an alumina adsorbent, and hydrogenated at high temperature and pressure, pref. at 50W270°C and 10W 300 hg/cm 2 G in the case of a hydrogenation catalyst such as Pd, Pt, etc.
Abstract: PURPOSE: To obtain pure sophorolipid useful as a cosmetic base and capable of being deodorized by the additional treatment, economically, by treating a crude sophorolipid derivative with a specific adsorbent and then hydrogenating and decoloring the treated product. CONSTITUTION: Sophorolipid derivative I (R 1 is methyl, H; R 2 is 11W15C hydrocarbon group when R 1 is methyl, and 12W16C hydrocarbon group when R 1 is H; R 3 is 1W20C hydrocarbon group; A is -CH 2 -CH 2 -0-, etc.; a+b+c+d+e+f+ g=1W60), or II is heated and stirred in the presence of an alumina adsorbent, and hydrogenated at high temperature and pressure, pref. at 50W270°C and 10W 300 hg/cm 2 G in the presence of a hydrogenation catalyst such as Pd, Pt, etc. The preferable examples of the alumina adsorbent are aluminium silicate, activated kaolin, activated alumina, etc. COPYRIGHT: (C)1980,JPO&Japio

Patent
14 Jan 1978
TL;DR: In this paper, an exhaust gas treatment catalyst which is inert to SO2 in exhaust gas and oxidizes HC and CO to harmless products with high conversion rate by supporting a complex of the Pt group metals and EDTA salts on activated alumina carrier is presented.
Abstract: PURPOSE:To obtain an exhaust gas treatment catalyst which is inert to SO2 in exhaust gas and oxidizes HC and CO to harmless products with high conversion rate by supporting a complex of the Pt group metals and EDTA salts on activated alumina carrier and calcining the supported carrier.

Patent
11 Mar 1978
TL;DR: In this article, a method of removing fluorine ions contained in waste water, in which zeolite treatment and carbonic acid removing treatment are preparatorily applied to waste water and then removed efficiently by the use of activated alumina.
Abstract: PURPOSE:To provide a method of removing fluorine ions contained in waste water, in which zeolite treatment and carbonic acid removing treatment are preparatorily applied to waste water, whereafter fluorine ions contained in the waste water can be removed efficiently by the use of activated alumina

Patent
11 Oct 1978
TL;DR: In this paper, the authors proposed to produce activated alumina of high strength by rapidly drying aluminum hydroxide in a hot gas followed by cooling, which is a technique similar to ours.
Abstract: PURPOSE:To produce activated alumina of high strength by rapidly drying aluminum hydroxide in a hot gas followed by cooling.

Patent
24 Apr 1978
TL;DR: In this paper, activated alumina of large specific surface area was attached to the inner surfaces of the pores of a carrier material comprising refractories to provide a catalyst carrier and catalyst with excellent purification characteristics, mechanical strength and durability.
Abstract: PURPOSE:To provide a catalyst carrier and catalyst with excellent purification characteristics, mechanical strength and durability by attaching activated alumina of large specific surface area to the inner surfaces of the pores of a carrier material comprising refractories.

Patent
05 Jun 1978
TL;DR: In this paper, water is added to partially rehydratable transition alumina with an average grain size of about 50 μ, and the amt of water added is about 20W70 wt%, and below 10 wt% of an auxiliary such as crystalline cellulose may be added to the alumina.
Abstract: PURPOSE: To produce activated alumina with high compressive strength, superior wear resistance and large specific surface area suitable for catalyst or carrier by molding water-added transition alumina followed by partial rehydration in steam, rehydration in steam of higher temp., and heat activation. CONSTITUTION: Water is added to partially rehydratable transition alumina with an average grain size of about 50 μ, transition alumina-contg. substance, i.e., χ- alumina or ρ-alumina, these alumina-contg. alumina or alumina hydroxide, and the water- added alumina is molded. The amt. of water added is about 20W70 wt%, and below 10 wt% of an auxiliary such as crystalline cellulose may be added to the alumina. The molded alumina is then rehydrated partially and gradually in steam of about 0W50, esp. 10W30°C, rehydrated substantially in steam of about 50W150, esp. 100W120°C, and heat activated at about 300W900°C. COPYRIGHT: (C)1979,JPO&Japio

Journal ArticleDOI
TL;DR: In this paper, the co-pyrolysis of 1,2-dichloropropane (DCP) and methanol on activated alumina was carried out at 270°C.
Abstract: The co-pyrolysis of 1,2-dichloropropane (DCP) and methanol on activated alumina was carried out at 270°C. The reaction products contained a significant amount of oxygen-containing compounds as well as the ordinary pyrolysis compounds. The formation of acetone and acrolein increased as a function of the time factor.