Removal of an impurity from a mixture with a codistillant

Details Removal of an impurity from a mixture with a codistillant Removal of an impurity from a mixture with a codistillant

1999-04-14

1999-11-02

Richter, Johann

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

Organic compounds

Nitriles

C07C25500

Patent

active

059773979

ABSTRACT:
Disclosed is a method of removing an acid halide, anhydride, or ester impurity from a mixture with a desired product with which it codistills. At least about a stoichiometric amount of a primary or secondary amine having a boiling point at least 10.degree. C. higher or lower than the boiling point of said desired product is added to the mixture. The desired product is not an acid halide, anhydride, or ester and does not react with the amine. The amine forms a reaction product with the impurity that has a boiling point at least 10.degree. C. higher or lower than the boiling point of the desired product. The mixture is distilled to isolate the desired product.

REFERENCES:
patent: 5866709 (1999-02-01), Hausladen et al.

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