Production method of acrylic acid

Details Production method of acrylic acid Production method of acrylic acid

1998-10-27

2000-05-30

Keys, Rosalynd

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

Organic compounds

Carboxylic acids and salts thereof

562546, 562547, 422196, 422198, 422201, 422211, C07C 5116, C07C 5125

Patent

active

060692715

ABSTRACT:
A method for producing acrylic acid from propylene at high efficiency by two-stage catalytic oxidation using a single fixed bed shell-and-tube heat exchanger type reactor is provided. The method comprises dividing the shell space of said reactor into an upper space and lower space with a partition plate, allowing a heating medium to circulate in each of the spaces substantially independently of each other, and carrying out the vapor phase oxidation under specific conditions. Said specific conditions including providing a first stage catalyst layer at lower portion of each of the reaction tubes, a second stage catalyst layer at upper portion thereof and an inert substance layer therebetween, and making void ratio of the inert substance layer 40-99.5%.

REFERENCES:
patent: 3147084 (1964-09-01), Franzen et al.
patent: 4203906 (1980-05-01), Takada et al.
patent: 4873368 (1989-10-01), Kadowaki et al.
patent: 4954650 (1990-09-01), Abe et al.
patent: 5048601 (1991-09-01), Yamaguchi et al.
patent: 5144091 (1992-09-01), Martan et al.

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