Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2006-05-02
2006-05-02
Richter, Johann (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C562S549000
Reexamination Certificate
active
07038081
ABSTRACT:
A method for producing polyacrylic acid includes a combined process of an acrylic acid production process and a polyacrylic acid production process. The acrylic acid production process includes the steps of catalytically oxidizing propylene and/or propane in a gaseous phase to generate reaction product, absorbing the reaction product in a solvent, and purifying acrylic acid from an acrylic acid aqueous solution containing the solvent by purification. The polyacrylic acid production process includes the step of utilizing heat medium recovered in the acrylic acid production process to purify polyacrylic acid from the acrylic acid aqueous solution or from acrylic acid.
REFERENCES:
patent: 0 922 717 (1999-06-01), None
patent: 2 095 688 (1982-10-01), None
patent: 52111986 (1977-09-01), None
Chemical Abstracts, vol. 88, No. 14, Apr. 3, 1978, Columbus, Ohio, U.S.; abstract No. 90451, “Continuous Polymerization of Sodium Acrylate”, p. 29, col. 1; XP002253377 & JP 77 111986 A (Sumitomo Chem., Co. Ltd.), Sep. 20, 1977.
Ishizaki Kunihiko
Matsumoto Yukihiro
Nakahara Sei
Nippon Shokubai Co. , Ltd.
Puttlitz Karl
Richter Johann
Wenderoth , Lind & Ponack, L.L.P.
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