Process for purifying (meth)acrylic acid and process for...

Details Process for purifying (meth)acrylic acid and process for... Process for purifying (meth)acrylic acid and process for...

2006-12-12

2006-12-12

Zucker, Paul A. (Department: 1621)

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

Organic compounds

Carboxylic acid esters

C562S600000

Reexamination Certificate

active

07148373

ABSTRACT:
There is provided a process for purifying (meth)acrylic acid by efficiently removing transition metal components from crude (meth)acrylic acid containing the transition metal components as impurities. When the crude (meth)acrylic acid containing the transition metal components as impurities is contacted with the cation exchange resin to remove the transition metal components therefrom, water is previously added to the crude (meth)acrylic acid prior to contacting the crude (meth)acrylic acid with the cation exchange resin. In the preferred embodiment of the present invention, the transition metal component is manganese.

REFERENCES:
patent: 4269705 (1981-05-01), Yoshioka et al.
patent: 09-157213 (1997-06-01), None
patent: 10-237012 (1998-09-01), None
patent: 10-306052 (1998-11-01), None
patent: 2001-213839 (2001-08-01), None

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