Rhenium oxide catalyst for metathesis of olefinic hydrocarbons, method of preparation thereof, and a propylene synthesis process involving use thereof
FIELD: petrochemical processes and catalysts.
SUBSTANCE: invention provides rhenium oxide catalyst on anion-containing gamma-alumina-based support: 0.1-10.0% Re2O3 and 0.2-4.0% fluorine based on the weight of alumina. Catalyst is prepared by impregnating alumina, including 0.2-4.0 wt % fluorine, with rhenium compound solution, drying resulting mass, and subjecting it to heat treatment in oxidative and/or inert medium at 600-900°C. Propylene synthesis process including metathesis of C2-C4-olefinic hydrocarbon blend or ethylene alone is also described.
EFFECT: increased catalytic activity and simplified technology.
7 cl, 2 tbl, 8 ex
The technical field to which the invention relates.
The invention relates to catalysts for metathesis of olefinic hydrocarbons and relates to the rhenium oxide catalyst on bionaturae media on the basis of gamma-aluminium oxide, method of producing rhenium oxide catalyst and method for the synthesis of propylene by metathesis of olefinic hydrocarbons using a specified catalyst.
The level of technology
It is known that the rhenium oxide catalysts based on aluminum oxide have low activity in the reaction of metathesis of olefinic hydrocarbons, if the concentration of rhenium in them does not exceed 1 wt.% [.Amigues, Y.Chauvin and D.Commereuc, Stepd, ..Lai, Y.H.Liu; Metathesis of ethylene-butene mixtures to propylene with rhenium on alumina catalysts (Metathesis of ethylene-butenova mixtures to obtain propylene using rhenium catalysts on alumina). Journal of Molecular Catalysis, t (1991), cc.39-50]. Given the high cost of rhenium, the active catalyst with a low content of rhenium can significantly reduce the cost of preparation of the catalyst.
A method of obtaining a rhenium oxide catalyst for the metathesis of olefins, comprising impregnation with a solution of compounds of rhenium gamma-aluminum oxide, pretreated with an acid solution, inorganic (e.g., hydrochloric acid) or organic (e.g., acetic acid), sleduushuu drying the resulting paste, the calcination in an oxidizing atmosphere at 300-900°and a final treatment in an inert gas. The content of the oxide of rhenium in the catalyst is 0.1-40 wt.% (GB 1106015, 1968). The disadvantages of this method is the need for pre-treatment of the alumina with solutions of acids, which complicates the preparation method of the catalyst, as well as a high content of oxide of rhenium, which leads to high cost of the catalyst.
Closest to the proposed invention is the rhenium oxide catalyst for metathesis of olefinic hydrocarbons prepared by impregnation of alumina containing anionic additive, a solution of the compound of rhenium, drying the mass, and subsequent heat treatment in air and inert gas at 580°C. For the introduction of aluminum oxide anionic additives used mineral acids (e.g., H2SO4or their salts, such as phosphates (for example, (NH4)2HPO4), fluoride (NH4F), vanadates. When the content of aluminum oxide of more than 0.1 wt.% chemically related anions their excess is removed by washing with water or an alkaline solution (GB 1216587, 1970). The disadvantage of this catalyst is its low activity. The disadvantage of this method of preparation of the catalyst is the need for pre-treatment of the oxide is of luminia salt solutions and rinsing it with water or alkaline solution, what complicates the process.
The known method for the synthesis of propylene by metathesis reaction of ethylene and butenes-2 using rhenium oxide catalyst, in which the concentration of rhenium is 0.01-20 wt.% rhenium, and the carrier is γ-alumina or a mixture containing at least 20 wt.% aluminum oxide and other oxides (US 4795734, 1989). The disadvantage of this method of synthesis of propylene is that this way you cannot get only propylene from ethylene.
Disclosure of inventions
The task to be solved by the invention is the development of high activity rhenium oxide catalyst for metathesis of olefinic hydrocarbons with low cost. The result is achieved that for the preparation of the catalyst with a lower content of rhenium is used anion-containing medium on the basis of gamma-alumina, comprising 0.2 to 4.0 wt.% fluorine as an anion.
In accordance with this object of the proposed invention is the rhenium oxide catalyst for metathesis of olefinic hydrocarbon anion-containing media with a basis of gamma-alumina, which includes fluoride as an anion, with the following content of components in the calculation of the gamma-aluminum oxide, wt.%: Re2O7- 0,1-10,0; fluorine - 0,2-4,0. The preferred content of the oxide of rhenium in ka is alistare is 0.5 to 8.0 wt.% in the calculation of the gamma-alumina. The preferred fluorine content is 0.2-2.2 wt.% in the calculation of the gamma-alumina.
Another object of the invention is a method for production of rhenium oxide catalyst for metathesis of olefinic hydrocarbons, including impregnation bionaturae media with a basis of aluminium oxide with a solution of the compound of rhenium, drying the resulting mass and subsequent heat treatment in an oxidizing and/or inert medium, in which as bionaturae media use gamma-alumina, comprising 0.2 to 4.0 wt.% fluorine calculated on gamma-alumina, and heat treatment is carried out at a temperature of 600-900°C.
As starting compounds of rhenium may be used any compound which is in the process of heat treatment decomposes with the formation of oxide of rhenium Re207, for example a compound selected from the group comprising an oxide of rhenium (VII), ammonium perrhenate, rhenium acid.
In the particular case of the complete method corresponding to the invention, heat treatment is carried out at a temperature of 600-800°C.
Another object of the invention is a method for the synthesis of propylene, comprising the metathesis reaction mixture of olefinic hydrocarbons With2-C4or one only of ethylene in the presence of rhenium oxide catalyst, corresponding to the invention.
Domestic the inventions
For preparation of rhenium oxide catalyst for metathesis of olefinic hydrocarbons using gamma-alumina, comprising fluorine in amount of 0.2 to 4.0 wt.%, that allows you to increase the activity of the catalyst corresponding to the invention, while maintaining the high selectivity and significantly reduce the content of rhenium in the catalyst. Rhenium oxide catalyst for metathesis of olefinic hydrocarbon contains 0.1 to 10.0 wt.% oxide of rhenium in the calculation of the gamma-alumina (γ-Al2O3), the content of fluorine in γ-Al2About3is 0.2 to 4.0 wt.%.
Getting rhenium oxide catalyst for the metathesis of olefins carried out by impregnation bionaturae media with a basis of gamma-alumina, comprising 0.2 to 4.0 wt.% fluorine as an anion in an aqueous solution of compounds of rhenium at 20-70°With at least 5 hours, drying the mass to remove the main quantity of the solvent and heat treatment in an oxidizing and/or inert atmosphere at a temperature of 600-900°for the decomposition of compounds of rhenium. The preferred mode of heat treatment is annealing of the catalyst in novosstroitelnaya atmosphere in the temperature range 600-800°C. Storing the thus prepared rhenium oxide catalyst is carried out in an inert gas environment.
Implemented the e method of producing propylene by using a rhenium oxide catalyst, relevant to the proposed invention is illustrated by Examples 1-8. The results of testing the proposed rhenium oxide catalyst in the metathesis reaction of ethylene (GOST 25070-87) and butenes-2 (99,1%, of the company "Aldrich") at 25-30°and atmospheric pressure are given in Table 1.
Obtaining propylene by metathesis reaction of ethylene and butenes-2
|Example||The composition of the catalyst, % wt.||Conditions on ignition||Conversion of butenes-2, %||The selectivity for C3H6, %|
|fluoride||Re2O7||T °||Wednesday||10 min||70 min||10 min||70 min|
|The known method||0,17||12||550||the air||62,2||-||99,9||-|
|1||2,0||12||550||the air||84,2||81,0||98,1||of 99.1|
|3||2,0||2||750||the air||82,3||79,7||of 98.2||99,2|
|7||2,0||6||750||the air||80,5||-||of 99.1||-|
|8||2,0||0,5||750||the air||57,6||-||of 98.2||-|
The results of using the proposed rhenium oxide catalyst in the reaction of synthesis of only propylene from ethylene using stage metathesis are shown in Table 2.
The conversion of ethylene
|Catalysis torus in example No.||T °C||About the lending rate, h-1||The conversion of ethylene, %||The selectivity of the formation of products, mol.%|
Rhenium oxide catalyst was prepared by impregnating 10 grams of gamma-alumina containing 2.0 wt.% fluoride, an aqueous solution of ammonium perrhenate NH4ReO4when 20-70°C for 6 hours, dried at 110°and conducting thermal treatment in air at 550°C for 2 hours, replace the air purge with argon and the catalyst for 1 hour at the same temperature. The catalyst contains 12 wt.% Re2O7in the calculation of the gamma-alumina.
A mixture of ethylene and butenes-2 in a molar ratio of 2.7:1 served in a flow reactor with a bulk velocity 645 h at room temperature and atmospheric pressure. A sample taken after 10 min and 7 min after establishing the desired mode (table 1).
For comparison, the prepared catalyst in a known manner (Patent GB 1216587) and tested in the reaction of metathesis of ethylene and butenes-2 (as in Example 1).
Getting rhenium oxide catalyst is carried out as in Example 1, but the amount of ammonium perrhenate in aqueous solution for impregnation of gamma-aluminum oxide is taken as a sample containing 2 wt.% Re2O7in the calculation of the gamma-alumina. The catalyst was tested in the reaction of metathesis of ethylene and butenes-2 (as in Example 1).
Getting rhenium oxide catalyst is conducted according to Example 2, but the temperature treatment is carried out at 750°in an atmosphere of air, and then cooling the sample to 500°replace the air with an inert gas (argon), aged in inert gas for 1 hour. The catalyst was tested in the reaction of metathesis of ethylene and butenes-2 (as in Example 1).
The catalyst was prepared for comparison. Obtaining catalyst is conducted according to Example 3, but using gamma-aluminum oxide with a fluorine content of 0.17 wt.%. The catalyst was tested in the reaction of metathesis of ethylene and butene-2 (as in Example 1).
Getting rhenium oxide catalyst is conducted according to Example 3, but the amount of ammonium perrhenate in aqueous solution for impregnation of gamma-aluminum oxide is taken as a sample of the composition of 1 mA is.% Re 2O7in the calculation of the gamma-alumina. The catalyst was tested in the reaction of metathesis of ethylene and butenes-2 (as in Example 1).
Getting rhenium oxide catalyst is conducted according to Example 5, but the temperature treatment is carried out at 750°With inert gas (argon). The catalyst was tested in the reaction of metathesis of ethylene and butenes-2 (as in Example 1) and in the conversion of only ethylene, the ethylene concentration in the initial mixture was 16-32%. (Table 2).
Obtaining catalyst is conducted according to Example 3, but as the parent compound of rhenium using the oxide of rhenium Re2O7that is, dissolving, gives rhenium acid. The number of Re2O7in aqueous solution for impregnation of gamma-alumina obtained for a sample of 6 wt.% Re2O7in the calculation of the gamma-alumina. A mixture of ethylene and butenes-2 in a molar ratio of 2.1:1 served in a flow reactor with a bulk velocity 645 h-1at 26°and atmospheric pressure.
Getting rhenium oxide catalyst is conducted according to Example 3, but the amount of ammonium perrhenate in aqueous solution for impregnation of gamma-aluminum oxide is taken as a sample composition of 0.5 wt.% Re2O7in the calculation of the gamma-alumina. The catalyst was tested in the reaction of metathesis of ethylene and butenes-2 (as, the example1).
Rhenium oxide catalyst corresponding to the proposed invention can be used in the processes of metathesis of olefinic hydrocarbons and allows high yield and selectivity to propylene get transformations as a mixture of olefins With2-C4and only one of ethylene. Rhenium oxide catalyst corresponding to the proposed invention, is characterized by thermal stability and low content of rhenium oxide, which reduces the cost of preparation of the rhenium oxide catalyst.
1. Rhenium oxide catalyst for metathesis of olefinic hydrocarbons to bionaturae form the basis of gamma-alumina, which includes fluoride as an anion at the following content of components in the calculation of the gamma-aluminum oxide, wt.%:
2. Rhenium oxide catalyst according to claim 1, in which the content Re2O7in the calculation of the gamma-aluminum oxide is 0.5 to 8.0 wt.%.
3. Rhenium oxide catalyst according to claim 1, in which the content of fluorine in the calculation of the gamma-aluminum oxide is 0.2-2.2 wt.%.
4. The method of obtaining the rhenium oxide catalyst for metathesis of olefinic hydrocarbons, including the non-impregnated bionaturae media with a basis of aluminium oxide with a solution of the compound of rhenium, drying the resulting mass and subsequent heat treatment in an oxidizing and/or inert medium, characterized in that as bionaturae media use gamma-alumina, comprising 0.2 to 4.0 wt.% fluorine calculated on gamma-alumina, and heat treatment is carried out at 600-900°C.
5. The method according to claim 4, characterized in that compounds of rhenium is chosen from the group comprising an oxide of rhenium (VII), ammonium perrhenate, rhenium acid.
6. The method according to claim 4, characterized in that the heat treatment is carried out at 600-800°C.
7. The method of synthesis of propylene, comprising the reaction of metathesis of olefinic hydrocarbon, C2-C4, characterized in that the reaction is carried out in the presence of a catalyst according to claims 1 to 3, and is subjected to metathesis mixture of olefinic hydrocarbons With2-C4or only one ethylene.
FIELD: petrochemical processes and catalysts.
SUBSTANCE: invention relates to supported olefin metathesis catalyst and to a olefin metathesis process using the latter. Catalyst is essentially composed of transition metal or oxide thereof, or a mixture of such metals, or oxides thereof deposited on high-purity silicon dioxide containing less than: 150 ppm magnesium, 900 ppm calcium, 900 ppm sodium, 200 ppm aluminum, and 40 ppm iron. When pure 1-butene comes into interaction with this catalyst under metathesis reaction conditions, reaction proceeds with 2-hexene formation selectivity at least 55 wt %. Use of catalyst according to invention in olefin metathesis process minimizes double bond isomerization reactions.
EFFECT: increased olefin metathesis selectivity regarding specific products.
17 cl, 2 tbl, 2 ex
FIELD: petrochemical processes.
SUBSTANCE: narrow-range hydrocarbon stock is fed into reaction-distillation tower at a level located between lower and upper tower parts to perform isomerization and disproportionation of hydrocarbons. Reaction mixture is maintained in vapor-liquid equilibrium state to concentrate lighter reaction products in vapor phase and higher ones in liquid phase by means of controlling temperature profile and in-tower pressure. Higher olefins are withdrawn as bottom product and lighter olefins from the top of tower.
EFFECT: increased yield of desired product.
41 cl, 4 dwg, 5 ex
FIELD: organic chemistry, petroleum chemistry, chemical technology.
SUBSTANCE: method involves preparing ethylene and hexane-1 from butene-1 by the exchange reaction of butene-1 and the isomerization reaction of synthesized hexane-3 to hexane-1. The parent material represents a mixed butene flow wherein butene-1 is isomerized to butene-2 after separation of isobutylene followed by the isomerization reaction of butene-2 to butene-1. Butene-1 is a raw for the exchange reaction.
EFFECT: improved preparing method, simplified technology process.
32 cl, 4 tbl, 4 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for synthesis of primary amine by the hydrogenation reaction of nitriles. Method involves carrying out the conversion reaction in reaction mixture that contains: (a) at least one nitrile; (b) hydrogen; (c) ammonia, if necessary, and (d) at least one cobalt or nickel catalyst modified ex situ by adsorption of alkaline metal carbonate or alkaline metal hydrocarbonate that comprises alkaline metal carbonate or hydrocarbonate taken in the amount from 2 to 12 wt.-%. Also, invention relates to a catalyst used in the method by cl. 1 and representing modified cobalt or nickel catalyst prepared by adsorption of alkaline metal carbonate or alkaline metal hydrocarbonate taken in the amount from 2 to 12 wt.-% on usual cobalt or nickel catalyst.
EFFECT: improved method of synthesis.
24 cl, 6 tbl, 48 ex
FIELD: alternate fuels.
SUBSTANCE: invention relates to production of synthetic gas via catalytic hydrocarbon conversion in presence of oxygen-containing gases and/or water steam as well as to catalysts suitable for this process. Invention provides catalyst, which is complex composite constituted by supported precious element, or supported mixed oxide, simple oxide, transition element, wherein support is a metallic carrier made from metallic chromium and/or chromium/aluminum alloy coated with chromium and aluminum oxides or coated with oxides of chromium, aluminum, or mixtures thereof. Catalyst preparation procedure and synthetic gas production process are also described.
EFFECT: increased conversion of hydrocarbons, selectivity regarding synthetic gas, and heat resistance of catalyst at lack of carbonization thereof.
4 cl, 3 tbl, 9 ex
FIELD: petroleum processing catalysts.
SUBSTANCE: invention provides gasoline fraction reforming catalyst containing 0.1-0.5% platinum, 0.1-0.4% rhenium, halogen (chorine, 0.7-1.5%, or chorine and fluorine, 0.05-0.1%), and carrier: surface compound of dehydrated aluminum monosulfatozirconate of general formula Al2O3·[ZrO(SO4)]x with weight stoichiometric coefficient x = 0.45·10-2 - 9.7·10-2 and real density 3.3±0.01 g/cm3. Catalyst preparation process comprises preparation of carrier by mixing (i) aluminum hydroxide, from which iron and sodium impurities were washed out (to 0.02%) and which has pseudoboehemite structure, with (ii) aqueous solution of monosulfatozirconic acid HZrO(SO4)OH containing organic components (formic, acetic, oxalic, and citric acids) followed by drying, molding, and calcination. Carrier is treated in two steps: first at temperature no higher than and then at temperature not below 70°C.
EFFECT: enabled production of reforming gasolines with octane number not below 97 points (research method) with yield not less than 86% and increased activity and selectivity of catalyst.
4 cl, 2 tbl, 13 ex
FIELD: inorganic synthesis catalysts.
SUBSTANCE: ammonia synthesis catalyst is based on ruthenium on carrier of inoxidizable pure polycrystalline graphite having specific BET surface above 10 m2/g, said graphite being characterized by diffraction pattern comprising only diffraction lines typical of crystalline graphite in absence of corresponding bands of amorphous carbon and which graphite being activated with at least one element selected from barium, cesium, and potassium and formed as pellets with minimal dimensions 2x2 mm (diameter x height). Catalyst is prepared by impregnating above-defined catalyst with aqueous potassium ruthenate solution, removing water, drying, reduction to ruthenium metal in hydrogen flow, cooling in nitrogen flow, water flushing-mediated removal of potassium, impregnation with aqueous solution of BaNO3 and/or CsOH, and/or KOH followed by removal of water and pelletizing of catalyst.
EFFECT: increased activity of catalyst even when charging ruthenium in amount considerably below known amounts and increased resistance of catalyst to methane formation.
12 cl, 1 tbl
FIELD: methods of preparation of catalysts for reforming of gasoline fractions in oil producing and petrochemical industries for production of high-octane motor fuels, aromatic hydrocarbons and commercial hydrogen.
SUBSTANCE: proposed method includes vacuum treatment of carrier, recirculation through aqueous solution of hydrochloric and acetic acids under vacuum, recirculation of impregnating solution; solutions of chloro-platinous and rhenium acids are introduced into impregnating solution at constant rate, after which solution is subjected to drying and calcination; treatment of carrier with impregnating solution is carried out at three stages: at first and second stages, temperature of circulating impregnating solution does not exceed 30°C and at third stage its temperature is not below 70°C.
EFFECT: enhanced activity, selectivity and stability of catalyst; reduced usage of metals; reduction of wastes and losses of platinum and rhenium.
10 cl, 2 dwg, 1 tbl, 8 ex
FIELD: oil refining; preparation of catalysts for refining of oil fractions; preparation of catalysts for benzene hydroisomerization process.
SUBSTANCE: proposed method includes mixing of components: zeolite component-mordenite with binder-aluminum hydroxide, plastification by means of peptizing by acid solution, granulation, application of platinum and reduction of catalyst; components are mixed at mass ratio of from 1:9 to 2:3 in terms of calcined mordenite and aluminum hydroxide; after application of platinum, heat treatment is carried out at two stages at temperature of 100-110°C at first stage and not above 250-300°C at second stage; reduction of catalyst is performed at temperature not below 500°C. Used as aluminum hydroxide is pseudo-boehmite of Catapal A grade. Used as zeolite component is high-modulus mordenite at silicate modulus M=20-30 at its content in catalyst of 20-30%. Used as zeolite component is low-modulus mordenite at silicate modulus M=10 at its content in catalyst not exceeding 10%.
EFFECT: enhanced selectivity of catalyst; considerable reduction of power requirements.
1 tbl, 3 ex
FIELD: catalytic chemistry; method of afterburning of organic admixtures and waste gases; chemical and petrochemical industries.
SUBSTANCE: proposed method is used for cleaning waste gases from styrene, toluene, isopropyl benzene, formaldehyde and oxidation products of higher fatty acids. Proposed method includes evacuation and impregnation of globular aluminosilicate zeolite-containing carrier; used as carrier is highly thermostable cracking catalyst to 100-% absorption by aqua solution of H2PtCl6 or PdCl2 at concentration of platinum or palladium of 0.4-0.8 g/l and volume ratio of impregnating solution to carrier of (0.6-0.08):1.0 of followed by sulfidizing with hydrogen sulfide and drying of catalyst. Proposed method makes it possible to clean waste gases from organic admixtures by 99.5-100%.
EFFECT: enhanced efficiency.
1 tbl, 5 ex
FIELD: organic chemistry, chemical technology, catalysts.
SUBSTANCE: invention describes a catalyst for dehydrogenation of (C2-C5)-hydrocarbons that comprises aluminum, chrome oxides, compound of modifying metal, alkaline and/or alkaline-earth metal. Catalyst comprises additionally silicon and/or boron compounds and as a modifying agent the proposed catalyst comprises at least one compound chosen from the following group: zirconium, titanium, iron, gallium, cobalt, molybdenum, manganese, tin. The catalyst is formed in the process of thermal treatment of aluminum compound of the formula Al2O3. n H2O wherein n = 0.3-1.5 and in common with compounds of abovementioned elements and shows the following composition, wt.-% (as measure for oxide): chrome oxide as measured for Cr2O3, 12-23; compound of a modifying metal from the group: Zr, Ti, Ga, Co, Sn, Mo and Mn, 0.1-1.5; silicon and/or boron compound, 0.1-10.0; alkaline and/or alkaline-earth metal compound, 0.5-3.5, and aluminum oxide, the balance. Catalyst shows the specific surface value 50-150 m2/g, the pore volume value 0.15-0.4 cm3/g and particles size 40-200 mcm. Also, invention describes a method for preparing this catalyst. Invention provides preparing the catalyst showing the enhanced strength and catalytic activity.
EFFECT: improved and valuable properties of catalyst.
12 cl, 2 tbl
FIELD: petroleum processing catalysts.
SUBSTANCE: catalyst designed for using in petroleum fraction hydrofining, which contains oxides of cobalt, molybdenum, phosphorus, lanthanum, boron, and aluminum, is prepared by mixing aluminum hydroxide with boric acid solution and nitric acid solution of lanthanum carbonate followed by drying, calcination, impregnation of resulting carrier with cobalt nitrate and ammonium paramolybdate solution in nitric acid at pH 2.0-3.5 and 40-80°C in presence of phosphoric acid followed by drying and calcination at elevated temperature.
EFFECT: enabled production of hydrogenate with reduced content of sulfur compounds.
FIELD: engineering of Fischer-Tropsch catalysts, technology for producing these and method for producing hydrocarbons using said catalyst.
SUBSTANCE: catalyst includes cobalt in amount ranging from 5 to 20 percents of mass of whole catalyst on argil substrate. Aforementioned substrate has specific surface area ranging from 5 to 50 m2/g. Catalyst is produced by thermal processing of argil particles at temperature ranging from 700 to 1300°C during period of time from 1 to 15 hours and by saturating thermally processed particles with cobalt. Method for producing hydrocarbon is realized accordingly to Fischer-Tropsch method in presence of proposed catalyst.
EFFECT: possible achievement of high selectivity relatively to C5+ at low values of diffusion resistance inside particles.
3 cl, 9 ex, 9 dwg
FIELD: organic synthesis catalysts.
SUBSTANCE: catalyst includes Cu and Mg compounds deposited on alumina as carrier and has copper compounds, expressed as Cu, from 2 to 8%, Mg/Cu atomic ratio ranging from 1.2 to 2.5, wherein concentration of copper atoms is higher in the interior of catalyst particle than on the surface (layer 20-30 Å thick) thereof and concentration of magnesium atoms prevails on the surface of catalyst particle, while specific surface of catalyst ranged from 30 to 130 m2/g. Oxychlorination of ethylene is carried out under fluidized bed conditions using air and/or oxygen as oxidants in presence of above-defined catalyst. Catalyst is prepared by impregnating alumina with aqueous Cu and Mg solutions acidified with hydrochloric acid solution or other strong acids using volume of solution equal or lesser than porosity of alumina.
EFFECT: increased activity of catalyst at high temperatures and avoided adhesion of catalyst particles and loss of active components.
8 cl, 2 tbl, 5 ex
FIELD: industrial organic synthesis catalysts.
SUBSTANCE: invention provides catalyst for oxidation of ethylene into ethylene oxide, which catalyst contains no rhenium and no transition metals and comprises up to 30% silver on solid support and promoter combination mainly consisted of (i) component containing alkali metal on amount from 700 to 3000 ppm of the mass of catalyst and (ii) component containing sulfur in amount from 40 to 100% by weight of amount required to form alkali metal sulfate and, optionally, a fluorine-containing component in amount from 10 to 300 ppm of the mass of catalyst. Ethylene oxide is produced via reaction of ethylene with molecular oxygen in presence of above-defined catalyst.
EFFECT: increased selectivity of catalyst.
9 cl, 3 tbl
FIELD: catalyst preparation methods.
SUBSTANCE: modified zeolite-containing catalyst preparation comprising heat treatment of initial catalyst in air flow and ion exchange is characterized by that initial catalyst utilized is zeolite Zeokar 10 used in petroleum processing for cracking of petroleum fractions, which catalyst is heated in flow-type reactor with air flow to 500-550°C for 6-12 h, after which treated for 4-6 h with 0.5-0.15 N hydrochloric acid solution, rinsed with water, heated once again for 6-12 h in air flow to 500-550°C, treated for 4-6 h with 0.5-0.15 N aqueous magnesium acetate solution, rinsed with water, and finally heated for 5-12 in air flow to 500-550°C.
EFFECT: increased catalytic activity and productivity in liquid phase at reduced temperatures (140-250°C) and pressures (1 to 30 atm), and enabled use of catalyst in continuous condensation and alkylation processes.
FIELD: industrial organic synthesis catalysts.
SUBSTANCE: catalyst is composed of alumina-supported active palladium component and promoter taken in following proportions: palladium 0.12-0.62%, promoter F 0.1-0.5% or promoter K 0.1-2.5%, the rest being alumina.
EFFECT: increased catalytic activity and lowered process temperature.
4 tbl, 12 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to a method for preparing vinyl chloride monomer and to a catalyst sued in catalytic preparing vinyl chloride monomer from flows comprising ethylene. Method for preparing vinyl chloride from ethylene is carried out by the oxidehydrochlorination reaction. Method involves combining reagents including ethylene, the source of oxygen and chlorine in the catalyst-containing reactor at temperature 350-500°C and under pressure from atmosphere to 3.5 MPa, i. e. under conditions providing preparing the product flow comprising vinyl chloride and ethylene. Catalyst comprises one or some rare-earth elements under condition that the atomic ratio between rare-earth metal and oxidative-reductive metal (iron and copper) is above 10 in the catalyst and under the following condition: when cerium presents then the catalyst comprises additionally at least one rare-earth element distinctive from cerium. Ethylene is recirculated from the product flow inversely for using at stage for combining reagents. Invention proposes a variant for a method for preparing vinyl chloride. Also, invention proposes variants of a method for catalytic dehydrochlorination of raw comprising one or some components taken among ethyl chloride, 1,2-dichloroethane and 1,1,2-trichloroethane in the presence of catalyst. Catalyst represents the composition of the formula MOCl or MCl3 wherein M represents a rare-earth element or mixture of rare-earth elements taken among lanthanum, cerium, neodymium, praseodymium, dysprosium, samarium, yttrium, gadolinium, erbium, ytterbium, holmium, terbium, europium, thulium and lutetium. The catalytic composition has the surface area BET value from 12 m2/g to 200 m2/g. Invention provides simplifying technology and enhanced selectivity of the method.
EFFECT: improved conversion method.
61 cl, 8 tbl, 32 ex
FIELD: conversion processes of chlorohydrocarbons; catalysts for joint production of chloroform and alkane chlorides.
SUBSTANCE: proposed catalyst is just product of interaction of ferrous chloride with nitrogen-containing organic derivative - amino alcohols of common formula R2NR1OH, where R=H or alkyl C1-C2, R1=C2-C5 alkyl applied on silica gel at content of FeCl2 of 0.7-1.5 mass-% of mass of silica gel at mass ratio of FeCl2/amino alcohol 1 : (5-20). Proposed catalyst makes it possible to increase life of heterogeneous catalyst, thus excluding stage of cleaning the products of process of joint production of chloroform and alkane chlorides and decreasing the cost of process due to replacement of copper chloride by ferrous chloride in the amount lesser by at least three times.
EFFECT: enhanced efficiency.
1 tbl, 12 ex