Process for producing acrylic acid

Details Process for producing acrylic acid Process for producing acrylic acid

2005-09-27

2005-09-27

Zucker, Paul A. (Department: 1621)

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

Organic compounds

Carboxylic acids and salts thereof

C562S532000

Reexamination Certificate

active

06949675

ABSTRACT:
The present invention provides a process for producing acrylic acid, by which process the problem, such that the catalyst placed on the gas inlet side deteriorates faster than that placed on the gas outlet side, is solved, so that the catalyst can be used stably for a long time. The process for producing acrylic acid, according to the present invention, comprises the step of carrying out catalytic gas phase oxidation with a fixed-bed shell-and-tube reactor as packed with a catalyst, wherein: used as the catalyst is an oxide shown by the following general formula (1): MOaVbAcBdCeOf(1) (wherein: A shows at least one member selected from the group consisting of niobium and tungsten; B shows at least one member selected from the group consisting of chromium, manganese, iron, cobalt, nickel, copper, zinc, and bismuth; C shows at least one member selected from the group consisting of phosphorus, tin, antimony, and tellurium); and at least two reaction zones as provided by dividing the inside of each reaction tube in a direction of an axis of the tube in the reactor are packed with the catalyst such that there are regulated the kind and/or amount of the A component and/or the kind and/or amount of the B component.

REFERENCES:
patent: 3567772 (1971-03-01), Yanagita et al.
patent: 3801634 (1974-04-01), Krabetz et al.
patent: 4223161 (1980-09-01), Shaw et al.
patent: 4415752 (1983-11-01), Decker et al.
patent: 5177260 (1993-01-01), Kawajiri et al.
patent: 5206431 (1993-04-01), Hashiba et al.
patent: 5719318 (1998-02-01), Kawajiri et al.
patent: 6403829 (2002-06-01), Unverricht et al.
patent: WO 00/53559 (2000-10-01), None
patent: 1 055 662 (2000-11-01), None
patent: 1 488 044 (1977-10-01), None
patent: 1488889 (1977-10-01), None
patent: 1488890 (1977-10-01), None
patent: 1 566 314 (1980-04-01), None
patent: 44-26287 (1969-11-01), None
patent: 50-25914 (1975-08-01), None
patent: 53-30688 (1978-08-01), None
patent: 57-54172 (1982-11-01), None
patent: 3-218334 (1991-09-01), None
patent: 7-10802 (1995-01-01), None
patent: 9-241209 (1997-09-01), None
patent: 2000-336060 (2000-12-01), None

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3421026