摘要:
Amines are prepared from an olefin and ammonia or a primary or secondary amine, or a mixture of these, in the presence of a borosilicate or borogermanate zeolite of the pentasil type as a catalyst, by a process in which the amine obtained is isolated from the reaction mixture, and unreacted starting materials are recycled.
摘要:
Amines are prepared from an olefin and ammonia or a primary and/or secondary amine in the presence of a zeolite catalyst of the pentasil type. Iron silicate zeolites of the pentasil type having an SiO.sub.2 /Fe.sub.2 O.sub.3 ratio greater than or equal to 10 are preferably used.
摘要翻译:胺在戊烯型沸石催化剂存在下由烯烃和氨或初级和/或仲胺制备。 优选使用SiO 2 / Fe 2 O 3比例大于或等于10的pentasil型铁硅酸盐沸石。
摘要:
.delta.-Formylvalerates are prepared by a process wherein a 3-pentenoate is treated with an isomerization catalyst at elevated temperatures and a 4-pentenoate is distilled off, and the resulting 4-pentenoate is reacted with carbon monoxide and hydrogen at from 80 to 160.degree. C. under from 1 to 30 bar in the presence of a rhodium carbonyl complex which has been modified with tertiary organic phosphines or phosphites.
摘要:
Ethanol is produced continuously via the carbonylation of methanol, by(a) carbonylating methanol, in a reactor R, in the presence of a carbonyl complex of a metal of group VIII of the periodic table and of a halogen compound,(b) separating, in a distillation column D1, the reactor discharge, into a top fraction comprising methyl acetate, methanol, dimethyl ether and an organohalogen compound, and into a bottom fraction comprising water, small quantities of acetic acid and the catalyst, if the latter is not in a fixed bed, the residence time being so adjusted that the greater part of the acetic acid reacts with the methanol present to give methyl acetate,(c) separating the top fraction from D1, in a distillation column D2, into a top fraction comprising small quantities of methyl acetate, methanol, dimethyl ether and the organo-halogen compound, and a bottom fraction comprising methyl acetate and methanol, and recycling the top fraction to reactor R,(d) distilling off, via the top of distillation column D3, the greater part of the water from the bottom fraction from D1and removing this water from circulation, and recycling to reactor R the bottom fraction consisting of small quantities of water, acetic acid and the catalyst,(e) using hydrogen to hydrogenate, in the hydrogenation reactor H, the bottom fraction from D2, in a conventional manner, to give a mixture of methanol and ethanol, and(f) separating the mixture into ethanol and methanol in a distillation column D4, and recycling the methanol to reactor R.
摘要:
A process for purifying carboxylic acid esters which have been obtained by reacting olefinically unsaturated compounds with carbon monoxide and alkanols and which contain aldehydes or acetals, wherein the said esters are treated with a strongly acidic agent, with or without addition of water.
摘要:
A process for the preparation of butanedicarboxylic acid esters, wherein(a) an aqueous cobalt salt solution is treated with excess carbon monoxide and hydrogen in the presence of active charcoal laden with cobalt carbonyl,(b) the resulting aqueous solution of cobalt carbonyl hydride is extracted with butadiene or a butadiene containing hydrocarbon mixture and the aqueous phase is separated off,(c) the butadiene, or butadiene/hydrocarbon mixture, containing cobalt carbonyl hydride, cobalt carbonyl and butenyl-cobalt tricarbonyl, is reacted with carbon monoxide and excess C.sub.1 -C.sub.4 -alkanol in the presence of a tertiary nitrogen base,(d) the resulting reaction mixture is freed from the tertiary nitrogen base contained therein, down to a content of from 0.1 to 0.3 mole per mole of pentenoic acid ester, and from excess hydrocarbons, and the pentenoic acid ester remaining in the reaction mixture is reacted with carbon monoxide and excess C.sub.1 -C.sub.4 -alkanol in the presence of the cobalt carbonyl and tertiary nitrogen base contained in the reaction mixture,(e) the reaction mixture is treated with an oxidizing agent in the presence of the aqueous acid solution which has been separated off in stage (b), and the mixture is separated into an organic phase, from which butanedicarboxylic acid esters are isolated by distillation, and an aqueous phase, and(f) the aqueous phase is extracted with water-immiscible solvents, the phases are separated, and the resulting aqueous phase is freed from alkanols and tertiary nitrogen base and is recycled to stage (a).
摘要:
Carboxylates which contain aldehydes, acetals and/or unsaturated compounds and are obtained by reacting an olefinically unsaturated compound with carbon monoxide and an alkanol are purified by a process wherein the said carboxylates are treated with hydrogen at elevated temperatures in the presence of an acidic ion exchanger or zeolite doped with one or more metals of group VIII of the periodic table, and the resulting low and/or high boilers are separated off by distillation.
摘要:
A process for the preparation of C.sub.1 -C.sub.4 -alkyl pent-3-enoates, wherein butadiene, or a hydrocarbon mixture containing butadiene, either of which contains not more than 0.1% by weight of butynes, is reacted with carbon monoxide and an alkanol of 1 to 4 carbon atoms in the presence of a cobalt carbonyl catalyst and a tertiary nitrogen base, having a pK.sub.A of 3-11, at from 100.degree. to 140.degree. C. under a pressure of from 300 to 1,000 bar.
摘要:
5-Methylbutyrolactone is prepared by a process in which a pentenoic ester of the formula IX--CO.sub.2 R (I),where X is CH.sub.2 .dbd.CH--CH.sub.2 --CH.sub.2 --, CH.sub.3 --CH.dbd.CH--CH.sub.2 -- or CH.sub.3 --CH.sub.2 --CH.dbd.CH-- and R is alkyl, cycloalkyl, aralkyl or aryl, or a mixture of these esters is reacted with water at from 50.degree. to 350.degree. C. in the presence or absence of a diluenta) over a zeolite and/or phosphate catalyst orb) in the presence of from 0.01 to 0.25 mole of a sulfonic acid, a Lewis acid and/or a non-oxidizing mineral acid per mole of pentenoic ester or over from 0.1 to 40% by weight, based on the pentenoic ester, of a strongly acidic ion exchanger as a catalyst in a first stage, or the pentenoic ester of the formula I, where X and R have the stated meanings, is hydrolyzed in a first stage with the aid of a strongly acidic ion exchanger as a catalyst to give the pentenoic acid of the formula I, where R is hydrogen, and the resulting pentenoic acid is subjected to cyclization in a second stage in the presence of from 0.005 to 0.1 mole of a sulfonic acid, a Lewis acid or a non-oxidizing mineral acid per mole of pentenoic acid or over from 0.1 to 20% by weight, based on the pentenoic acid, of a strongly acidic ion exchanger at from 50.degree. to 350.degree. C.
摘要:
A process for the manufacture of salts of alkanedicarboxylic acids of 4 to 12 carbon atoms and alkanediamines of 3 to 14 carbon atoms, comprising reacting esters of alkanols of 1 to 4 carbon atoms and alkanedicarboxylic acids of 4 to 12 carbon atoms with alkanediamines of 3 to 14 carbon atoms in stoichiometric amounts in the presence of water at an elevated temperature, with continuous removal of the alkanols formed, in which process the reaction is carried out, from the start, in the presence of the particular salt of alkanedicarboxylic acid and alkanediamine which is to be manufactured.