Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound
Patent
1996-12-05
1998-07-28
Bhat, Nina
Distillation: processes, separatory
Adding material to distilland except water or steam per se
Organic compound
562600, B01D 334
Patent
active
057858217
ABSTRACT:
The present invention provides an improved process for production of acrylic acid by subjecting propylene and/or acrolein to catalytic gas-phase oxidation with a molecular oxygen-containing gas. In the process, the mixed gas obtained by the catalytic gas-phase oxidation is contacted with an aqueous collecting agent containing acrylic acid, acetic acid and a poorly-soluble-in-water solvent, to form an aqueous acrylic acid solution; and the aqueous acrylic acid solution is subjected to azeotropic distillation in the presence of a poorly-soluble-in-water solvent to remove by-products and obtain high-purity acrylic acid.
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Akazawa Yohji
Nakahara Sei
Sakamoto Kazuhiko
Takeda Takahiro
Ueoka Masatoshi
Bhat Nina
Nippon Shokubai Co. , Ltd.
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