Method for production of acrylic acid

Details Method for production of acrylic acid Method for production of acrylic acid

2006-12-19

2006-12-19

Oh, Taylor Victor (Department: 1625)

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

Organic compounds

Carboxylic acids and salts thereof

C562S600000

Reexamination Certificate

active

07151194

ABSTRACT:
A method for producing acrylic acid from an acrylic acid-containing solution of high concentration without performing azeotropic distillation is provided. This method of producing acrylic acid comprises steps of absorbing acrylic acid-containing gas, distilling the acrylic acid-containing solution without using an azeotropic solvent thereby obtaining crude acrylic acid as a column bottom stream and/or a column side stream, and supplying the crude acrylic acid to a crystallizing step and melt crystallizing the crude acrylic acid thereby obtaining purified acrylic acid.

REFERENCES:
patent: 5315037 (1994-05-01), Sakamoto et al.
patent: 5817865 (1998-10-01), Machhammer et al.
patent: 6482981 (2002-11-01), Ueno et al.
patent: 1 059 281 (2000-05-01), None

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