Distillation: processes – separatory – With measuring – testing or inspecting – Of concentration
Reexamination Certificate
2006-05-23
2006-05-23
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
With measuring, testing or inspecting
Of concentration
C203S008000, C203S038000, C203S059000, C562S600000
Reexamination Certificate
active
07048834
ABSTRACT:
The present invention provides an industrially easy and economical method for purification of acrylic acid which enables to efficiently eliminate impurities from a crude acrylic acid containing aldehydes as the impurities while the formation of acrylic acid polymer is inhibited. The method for purification of acrylic acid includes the step of distilling a crude acrylic acid which is charged with an aldehyde treatment chemical, wherein the concentration ratio of furfural to acrolein by weight in the crude acrylic acid is adjusted so as to satisfy the following equation:in-line-formulae description="In-line Formulae" end="lead"?(furfural concentration by weight)/(acrolein concentration by weight)≦100.in-line-formulae description="In-line Formulae" end="tail"?
REFERENCES:
patent: 5482597 (1996-01-01), Herbst et al.
patent: 5571386 (1996-11-01), Bauer et al.
patent: 5746892 (1998-05-01), Bauer et al.
patent: 5759358 (1998-06-01), Bauer, Jr. et al.
patent: 6179966 (2001-01-01), Shimizu et al.
patent: 6207022 (2001-03-01), Dockner et al.
patent: 6228227 (2001-05-01), Herbst et al.
patent: 6352619 (2002-03-01), Fauconet et al.
patent: 6458989 (2002-10-01), Aichinger et al.
patent: 6787001 (2004-09-01), Sakamoto et al.
patent: 2 753 445 (1998-03-01), None
patent: 2 285 046 (1995-06-01), None
patent: 7-228548 (1995-08-01), None
patent: 9-316027 (1997-12-01), None
Ishii Yoshitake
Mitsumoto Tetsuji
Nakahara Sei
Nakama Hisao
Nishimura Takeshi
Manoharan Virginia
Nippon Shokubai Co. , Ltd.
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