Process for the hydrolysis of dicarboxylic acid triglycerides
AssigneeNovamont S.p.A.
InventorFrancesca Digioia
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Abstract
This invention relates to an improved hydrolysis process for the preparation of dicarboxylic acids in which an organic phase comprising triglycerides of carboxylic acids having more than one acid functional group and a mixture comprising dicarboxylic acids, glycerine and partial esters of glycerine are mixed with water and hydrolysed at temperatures of between 50 and 350° C., and at pressures of or above the equilibrium vapor pressure. This process makes it possible to obtain high hydrolysis yields, even in short times.
Claims20
A process for the preparation of dicarboxylic acids from triglycerides of carboxylic acids having more than one acid functional group comprising the steps of:
- a) mixing water with an organic phase consisting of triglycerides of carboxylic acids having more than one acid function and from 3 to 20% by weight with respect to the weight of the organic phase of a mixture comprising partial esters of glycerine with at least a dicarboxylic acid;
- and
- b) hydrolysing the mixture obtained at the end of step a) in one or more hydrolysis reactors at temperatures of between 150 and 350° C., and at pressures corresponding to or higher than the equilibrium vapor pressure;
- c) separating the dicarboxylic acids from the hydrolysis product obtained in step b).
Dependencies are inferred from the claim text.