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Title:
PREPARATION OF ACRYLIC ACID OR METHACRYLIC ACID
Document Type and Number:
Japanese Patent JPS60246342
Kind Code:
A
Abstract:

PURPOSE: To prepare acrylic acid in high selectivity and yield, by catalytically reacting acetic acid or propionic acid with formaldehyde in the vapor phase in the presence of a solid acid catalyst having a moderately strong acid strength.

CONSTITUTION: Acetic acid or propionic acid in the vapor phase is brought into contact with formaldehyde in the presence of a solid catalyst to give acrylic acid or methacrylic acid. In the process, a solid catalyst having acid sites exhibiting ≤-3.0pKa, particularly within ≥-8.2pKa and ≤-3.0pKa range acid strength such as silica alumina is used as the catalyst exhibiting high activity, selectivity and conversion. The acid strength of acid sites even in an oxide or compound oxide having no acid site exhibiting within ≤-3.0pKa range can be increased, and such catalyst can be used.


Inventors:
NIITSUMA HIROSHI
ITOU TSUTOMU
MIKI TOSHIROU
KOJIMA SHIROU
AZUMA TAKASHIROU
KATOU HIROYUKI
MURAKAMI YUUICHI
Application Number:
JP10041884A
Publication Date:
December 06, 1985
Filing Date:
May 21, 1984
Export Citation:
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Assignee:
TOA GOSEI CHEM IND
International Classes:
C07C57/04; B01J21/00; B01J21/12; B01J27/00; B01J27/16; C07B61/00; C07C51/00; C07C51/353; C07C57/05; C07C67/00; (IPC1-7): B01J21/12; B01J27/16; C07C51/353; C07C57/04