Method of removing iodine compounds from crude acetic anhydride

Details Method of removing iodine compounds from crude acetic anhydride Method of removing iodine compounds from crude acetic anhydride

1996-06-03

1997-08-05

Manoharan, Virgina

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

203 38, 203 73, 203 74, 203 88, 203 99, 203DIG19, 562608, B01D 306, B01D 334, C07C 5144

Patent

active

056538537

ABSTRACT:
A process by which iodine compounds contained in crude acetic anhydride or a mixture of crude acetic anhydride and crude acetic acid can be converted into methyl iodide having a low boiling point and which can be separated by distillation and efficiently removed by the combination of the conversion step with the heat treatment step and distillation step. The process includes the steps of heat-treating the crude acetic anhydride or the mixture of crude acetic anhydride and crude acetic acid in the presence of methanol and/or methyl acetate in a treatment tank and distilling the heat-treated crude acetic anhydride or the heat-treated mixture of crude acetic anhydride and crude acetic acid, in the presence of an alkali metal salt and/or an alkaline earth metal salt if necessary.

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