Distillation: processes – separatory – With measuring – testing or inspecting
Reexamination Certificate
2007-08-21
2007-08-21
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
With measuring, testing or inspecting
C203S002000, C203S003000, C203S096000, C203S029000, C203SDIG021, C203SDIG025, C562S532000, C562S600000
Reexamination Certificate
active
10828340
ABSTRACT:
A method for collecting acrylic acid is provided, which includes the step of collecting acrylic acid using an aqueous medium from a reaction gas containing acrylic acid obtained by catalytic vapor-phase oxidation of propane, propylene, and/or acrolein, the step being conducted so as to satisfy the following formula (1) (B/A)<1.25 (1) wherein A represents a weight fraction of acrylic acid to all condensable ingredients in the reaction gas before collecting acrylic acid and B represents a weight fraction of acrylic acid in bottoms of a collection device used in the step of collecting. According to the method, acrylic acid can be efficiently collected from the reaction gas containing acrylic acid obtained by catalytic vapor-phase oxidation.
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Jinno Kimikatsu
Ogawa Yasushi
Suzuki Yoshiro
Yada Shuhei
Manoharan Virginia
Mitsubishi Chemical Corporation
Wenderoth , Lind & Ponack, L.L.P.
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