摘要:
An alcohol such as methanol is reacted with carbon monoxide in a liquid reaction medium including a catalyst, an alkyl iodide such as methyl iodide, alkyl acetate such as methyl acetate in specified proportions, an additive, and an effective amount of water, where the additive increases an ionic character of the hydrogen iodide bond and the effective amount of water is sufficient to facilitate carboxylic acid release after carbonylation at the catalyst and to reduce anhydride formation. The present reaction system not only provides an acid product at water levels considerable below levels currently used, but also provides unexpected reaction rates and unexpected high catalyst stability.
摘要:
A method for removing aldehyde impurities from an acetic acid stream is disclosed. The method comprises reacting an acetic acid stream containing aldehyde impurities with a hydroxyl compound to form corresponding acetals. The acetals are subsequently removed from the acetic acid by, e.g., distillation.
摘要:
An improved process for producing high activity and high selectivity supported palladium-gold catalysts is provided. The process involves calcining the support impregnated with a palladium salt and gold salt in a non-reducing atmosphere and at a temperature ranging from 100.degree. C. to 600.degree. C. prior to reducing the metals. Catalysts of the invention are useful for the production of vinyl acetate in the vapor phase by reaction of ethylene, acetic acid and oxygen.
摘要:
A process for the telomerization of a conjugated alkadiene with an organic hydroxy compound to produce an organo-oxyalkadiene is disclosed. A palladium catalyst having an ionic ligand is employed in a substantially oxygen-free environment in the presence of an aprotic polar solvent so that the reaction products may be separated from the catalyst by solvent extraction with a hydrocarbon solvent.
摘要:
A new class of compounds, the alkyl 9-alkoxy-7-nonenoates, is disclosed. These compounds are important intermediates in the synthesis of sebacic acid.
摘要:
Methyl tertiary-butyl ether (MTBE), a high-octane blending agent for motor fuels, is prepared in high yield by the process which comprises reacting isobutylene and methanol in the presence of a catalytically effective amount of at least one heterogeneous catalyst selected from the group consisting of boron phosphate, blue tungsten oxide and crystalline aluminosilicate zeolite having a silica to alumina mole ratio of at least about 12:1 and a constraint index of from 1 to about 12.
摘要:
Ethylenically unsaturated polymerization catalyst compositions including an active catalytic metal component and an ionic compound component and methods for making and using same.
摘要:
A method is disclosed for the production of esters by reaction of an alkyl acyclic allylic ether such as 8-methoxy-1,6-octadiene with carbon monoxide in the presence of a halide of nickel, cobalt or iron as a catalyst and especially nickel iodide for the production of esters. Carbonylation of 8-methoxy-1,6-octadiene results in the production of methyl-3,8-nonadienoate; 2-(carbomethoxymethyl)-vinylcyclopentane; 2-(carbomethoxymethyl)-6-vinylcyclohexanone and 2-carbomethoxymethylbicyclo(3.3.0)-octan-3-one.
摘要:
A process for the telomerization of a conjugated alkadiene with an alkanol is disclosed for the production of an organo-oxyalkadiene. A palladium catalyst having a phosphine or stibene ligand is employed in a substantially oxygen-free environment and in the presence of a high boiling solvent so that the reaction products may be separated from the catalyst by distillation. Vacuum fractional distillation is a preferred method for separating the products.
摘要:
Disclosed is a method for removing aldehyde impurities from a methyl acetate supply. The method comprises reacting the methyl acetate supply with a polyol and converting the aldehyde impurities to cyclic acetals. The acetals are subsequently removed from the methyl acetate supply by, e.g., distillation. The purified methyl acetate supply is used for carbonylation to produce acetic acid.