Method for producing acrylic acid

Details Method for producing acrylic acid Method for producing acrylic acid

2008-03-11

2008-03-11

Puttlitz, Karl (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S600000

Reexamination Certificate

active

11634133

ABSTRACT:
A method for producing acrylic acid, comprising (a) a absorption step of absorbing acrylic acid-containing gas obtained by oxidizing raw material gas in gas phase as crude acrylic acid-containing solution, (b1) a step of separating high boiling point components that separates the crude high boiling point components at a distillation column as (b) a step of purifying the acrylic acid-containing solution, and further, (c) a decomposition step of decomposing Michael adducts contained in the high boiling point components to prepare acrylic acid and (d) a collection step of collecting acrylic acid generated in the decomposition step (c), whereby the proportion of the amount of maleic acid to a sum of the sum of the maleic acid and maleic anhydride in the high boiling point components that are fed from the high boiling point component separation step (b1) to the decomposition step (c) satisfies a equation below:[Equation⁢⁢1]⁢`[Maleic⁢⁢acid⁢⁢(mass)][Maleic⁢⁢acid⁢⁢(mass)]+[Maleic⁢⁢anhydride⁡(mass)]×100≦70⁢⁢%⁢.(1)

REFERENCES:
patent: 3868410 (1975-02-01), Horlenko et al.
patent: 5897749 (1999-04-01), Kroker et al.
patent: 6383973 (2002-05-01), Kimura et al.
patent: 6482981 (2002-11-01), Ueno et al.
patent: 6498272 (2002-12-01), Schröder et al.
patent: 6870066 (2005-03-01), Shibusawa et al.
patent: 2004/0015014 (2004-01-01), Nishimura et al.
patent: 2004/0220426 (2004-11-01), Yada et al.
patent: 2004/0220427 (2004-11-01), Yada et al.
patent: 0 887 334 (1998-12-01), None
patent: 1 162 192 (2001-12-01), None
patent: 47-40621 (1972-10-01), None
patent: 49-55614 (1974-05-01), None
patent: 53-41637 (1978-11-01), None
patent: 8-206504 (1996-08-01), None
patent: 9-110778 (1997-04-01), None
patent: 11-12222 (1999-01-01), None
patent: 2000-325795 (2000-11-01), None
patent: 2001-199931 (2001-07-01), None
patent: 1 162 192 (2001-12-01), None
patent: 2001-348358 (2001-12-01), None
patent: 2001-348359 (2001-12-01), None
patent: 2001-348360 (2001-12-01), None
patent: 2002-539104 (2002-11-01), None
patent: 2003-160532 (2003-06-01), None
patent: 2003-171342 (2003-06-01), None
patent: 2003-246765 (2003-09-01), None
patent: 2003-321418 (2003-11-01), None
patent: 2004-51489 (2004-02-01), None
patent: 2005-15478 (2005-01-01), None

Affiliated with

Also associated with

Rating

Method for producing acrylic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for producing acrylic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for producing acrylic acid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3934799