Process for the preparation of pure crotonic acids

Details Process for the preparation of pure crotonic acids Process for the preparation of pure crotonic acids

1985-10-02

1990-04-17

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

562598, C07C 5143, C07C 5708

Patent

active

049182250

ABSTRACT:
The invention relates to a process for the preparation of pure cis- or trans-crotonic acid from a mixture of the two isomers by melt crystallization. To prepare trans-crotonic acid, an isomer mixture I containing at least 40% by weight of trans-crotonic acid is used as the starting material. On the other hand, if cis-crotonic acid is to be prepared, an isomer mixture II containing at least 80% by weight of cis-crotonic acid is used as the starting material. The particular isomer mixture is melted and then left to cool, trans-crotonic acid being allowed to crystrallize out of mixture I to a residual content of at least 35% by weight, and cis-crotonic acid being allowed to crystallize out of mixture II to a residual content of at least 75% by weight.

REFERENCES:
patent: 3375082 (1968-03-01), Graf et al.
Kirk-Othmer, Encyclopedia of Chemical Technology, 2nd ed., vol. 6, John Wiley & Sons Inc., N.Y., 1965, pp. 464-467.

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