PROCESS FOR PRODUCING METHACROLEIN AND METHACRYLIC ACID

Title:

PROCESS FOR PRODUCING METHACROLEIN AND METHACRYLIC ACID

Document Type and Number:

WIPO Patent Application WO/1991/008185

Kind Code:

A1

Abstract:

A process for producing methacrolein and methacrylic acid by the vapor phase catalytic oxidation of at least one of isobutylene, t-butanol and methyl t-butyl ether with molecular oxygen or a gas containing the same in a fixed bed multitubular reactor, characterized in that: $g(a) the catalyst used herein is a composite oxide of general formula (I) Mo¿a?W¿b?Bi¿c?Fe¿d?A¿e?B¿f?C¿g?D¿h?E¿i?O¿x?; wherein Mo represents molybdenum; W represents tungsten; Bi represents bismuth; Fe represents iron; A represents at least one element selected between nickel and cobalt; B represents at least one element selected from among alkali metals and thallium; C represents at least one element selected from among alkaline earth metals; D represents at least one element selected from among phosphorus, tellurium, antimony, tin, cerium, lead, niobium, manganese, arsenic and zinc; E represents at least one element selected from among silicon, aluminium, titanium and zirconium; O represents oxygen; a, b, c, d, e, f, g, h, i, and x are the numbers of atoms represented by Mo, W, Bi, Fe, A, B, C, D, E and O, respectively; and b is 0-10, c is 0.1-10, d is 0.1-20, e is 2-20, f is 0-10, g is 0-10, h is 0-4, i is 0-30, and x is a value dependent on the oxidation state of each element, when a is 12, $g(b) a plurality of reaction zones are provided by dividing a catalyst layer into at least two layers in the axial direction of each reaction tube, and $g(g) catalysts with different activities prepared by varying the kinds and/or amounts of the elements of groups A, B, C, D and E in general formula (I) of the item $g(a), and/or catalysts with different activities prepared by varying the amount of at least one element selected from among W, Bi and Fe are packed in said plurality of reaction zones in such a manner that the catalytic activity increases along a path from the feed port of starting gas to the discharge port.

Inventors:

ONODERA HIDEO (JP)
OHNO SHIGERU (JP)
KURIMOTO IKUO (JP)
AOKI YUKIO (JP)

Application Number:

PCT/JP1990/001594

Publication Date:

June 13, 1991

Filing Date:

December 06, 1990

Export Citation:

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Assignee:

NIPPON CATALYTIC CHEM IND (JP)

International Classes:

B01J8/06; B01J23/88; B01J23/887; B01J23/888; B01J27/057; B01J27/186; B01J27/192; C07C27/12; C07C45/32; C07C45/35; C07C45/37; C07C51/23; C07C51/235; C07C51/25; C07C57/05; (IPC1-7): B01J23/88; B01J37/08; C07C27/00; C07C45/32; C07C45/35; C07C47/22; C07C51/21; C07C57/05

Foreign References:

JPS55113730A	1980-09-02
JPS58119346A	1983-07-15
JPS5946132A	1984-03-15
JPS51127013A	1976-11-05
JPS543008A	1979-01-11
JPS6133135A	1986-02-17
JPS58143843A	1983-08-26
JPS5547144A	1980-04-03
JPS5096513A	1975-07-31
JPS4931606A	1974-03-22

Other References: