PROCESS FOR THE PREPARATION OF CARBOXYLIC ESTERS OF HEXITOLS
A process is described for preparing carboxylic acid esters of hexitols by rapidly heating the hexitol and carboxylic acid to 210 DEG to 250 DEG C. in the presence of alkaline catalysts, continuing the esterification reaction at this temperature, while simultaneously driving off the water formed, un...
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| Format: | Patent |
| Sprache: | eng ; ger |
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| Zusammenfassung: | A process is described for preparing carboxylic acid esters of hexitols by rapidly heating the hexitol and carboxylic acid to 210 DEG to 250 DEG C. in the presence of alkaline catalysts, continuing the esterification reaction at this temperature, while simultaneously driving off the water formed, until an acid number of 2 to 15 has been reached, and then rapidly cooling down to at least 145 DEG C. This process produces hexitol carboxylates which are essentially free of anhydro compounds and have good color quality. The hexitol carboxylates are surface-active substances, in particular high-grade emulsifiers and lubricants. |
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