摘要:
This invention relates to a process for producing alpha-hydroxy ketones by condensation of one or more aldehydes in a liquid reaction system in the presence of an active condensation catalyst wherein the catalyst upon deactivation is reactivated by removal of water therefrom and recycled to the reaction system. Dihydroxyacetone is a vital raw material for the production of glycerol.
摘要:
This invention relates to a process for the catalytic hydrogenation of alpha-hydroxy ketones to the corresponding alcohol in a heterogeneous liquid phase reaction medium which contains a carboxylic acid. The carboxylic acid may be a simple carboxylic acid or a hydroxy carboxylic acid. The presence of the carboxylic acid improves both the yield of and selectivity to the alcohol product.
摘要:
This invention relates to a process for synthesis of glycerol from formaldehyde, wherein formaldehyde under substantially anhydrous condition is self-condensed in a catalytic step to dihydroxyacetone which is separated from the self-condensation catalyst and hydrogenated catalytically to glycerol. The feature of the invention is to have less than 0.4% w/w of water in the self-condensation reaction mixture thereby improving the process to produce glycerol in commercially viable rates and yields.
摘要:
This invention relates to an improved process for the production of hydroxyketones, especially dihydroxyacetone, by the condensation of one or more aldehydes in the presence of a catalyst and the use of specific process train. The product of this process is a relatively pure and any waste products from the reaction are environmentally friendly because none of the chemical components are discharged into the waste streams.
摘要:
This invention relates to a process for making butyraldehyde from an n-butenyl ester of a carboxylic acid, said process comprising hydrolysing the n-butenyl ester to form the corresponding n-butenyl alcohol and ii) isomerising the n-butenyl alcohol produced in step i) to form butyraldehyde.
摘要:
This invention relates to a process for synthesis of glycerol from formaldehyde, wherein formaldehyde under substantially anhydrous condition is self-condensed in a catalytic step to dihydroxyacetone which is separated from the self-condensation catalyst and hydrogenated catalytically to glycerol. The feature of the invention is to have less than 0.4% w/w of water in the self-condensation reaction mixture thereby improving the process to produce glycerol in commercially viable rates and yields.
摘要:
A process for the production of glycerol from formaldehyde which process comprises reacting at elevated temperature formaldehyde in a liquid reaction medium with hydrogen in the presence of a catalyst system comprising as essential components (i) a thiazolium or imidazolium salt, (ii) a proton abstractor, and (iii) a compound or mixture containing (a) a rhodium or ruthenium moiety and optionally (b) a moiety of the formula XR₃ wherein X is either phosphorus, nitrogen arsenic or antimony and the groups R are independently either hydrogen or hydrocarbyl or substituted hydrocarbyl groups.