A process of isolating dihydroxyacetone which is a useful intermediate in organic chemistry as well as being a sun-tanning agent. The process comprises passing a reaction mixture containing dihydroxyacetone in an organic solvent through at least one thin film evaporator to distil dihydroxyacetone separately from the solvent.
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.
This invention relates to a process for condensing aldehydes to alpha-hydroxyketones in a liquid system containing an aldehyde and an active condensation catalyst formed by the abstraction of HX from a thiazolium salt in which X is the anion. The reaction is carried out in the absence of a base (other than the active catalyst) and the anion X. The catalyst is rendered free of the undesirable base and the anion X because these are the cause of premature deactivation of the catalyst.
本发明涉及一种在含有醛和活性缩合催化剂的液体体系中将醛缩合成α-羟基酮的工艺,活性缩合催化剂是通过从噻唑盐(其中 X 为阴离子)中抽取 HX 而形成的。反应是在没有碱(活性催化剂除外)和阴离子 X 的情况下进行的。催化剂中没有不需要的碱和阴离子 X,因为它们是催化剂过早失活的原因。
Process for the production of glycerol from formaldehyde