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1. (WO2018037998) METHOD FOR PRODUCING CATALYST FOR METHACRYLIC ACID PRODUCTION, METHOD FOR PRODUCING METHACRYLIC ACID AND METHOD FOR PRODUCING METHACRYLIC ACID ESTER

Pub. No.:    WO/2018/037998    International Application No.:    PCT/JP2017/029556
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Fri Aug 18 01:59:59 CEST 2017
IPC: B01J 37/04
B01J 27/199
Applicants: MITSUBISHI CHEMICAL CORPORATION
三菱ケミカル株式会社
Inventors: KATO Yuki
加藤 裕樹
TAGAWA Yuichi
田川 雄一
Title: METHOD FOR PRODUCING CATALYST FOR METHACRYLIC ACID PRODUCTION, METHOD FOR PRODUCING METHACRYLIC ACID AND METHOD FOR PRODUCING METHACRYLIC ACID ESTER
Abstract:
Provided is a catalyst for methacrylic acid production, which has high methacrylic acid yield. A method for producing a catalyst for methacrylic acid production, which comprises: (1) a step for preparing a catalyst starting material liquid A that contains Mo, P and V; (2) a step for preparing a catalyst starting material liquid B that contains a cationic starting material; and (3) a step for preparing a liquid that contains a heteropolyacid having a Keggin-type structure or a salt of the heteropolyacid by adding one of the catalyst starting material liquid A and the catalyst starting material liquid B to the other and mixing together. In the step (3), formulae (i) and (ii) are satisfied. 3.0 ≤ T/(3√V) ≤ 13.0 (i) 0.01 ≤ u1 ≤ 1.0 (ii) (In formulae (i) and (ii), V represents the volume [m3] of the catalyst starting material liquid A; T represents the number of addition ports through which the other liquid is added; u1 represents the volumetric flow rate [L/minute] of the other liquid added; and u1 represents the average in cases where T is 2 or more.)