Title:
METHOD FOR PRODUCING 1,4-BUTANEDIOL AND CO-PRODUCING SUCCINIC ANHYDRIDE BY MEANS OF DIRECT HYDROGENATION OF MALEIC ANHYDRIDE
Document Type and Number:
WIPO Patent Application WO/2023/115843
Kind Code:
A1
Abstract:
Disclosed in the present invention is a method for producing 1,4-butanediol and co-producing succinic anhydride by means of direct hydrogenation of maleic anhydride. Maleic anhydride and hydrogen are used as raw materials to obtain 1,4-butanediol by means of two-step hydrogenation. In the first-step hydrogenation reaction of maleic anhydride, γ-butyrolactone and succinic anhydride products are obtained by means of multi-column rectification separation. The second-step hydrogenation reaction relates to γ-butyrolactone hydrogenation to obtain a 1,4-butanediol product by means of rectification separation. The method specifically comprises the following steps: a, maleic anhydride hydrogenation; b, refining of a succinic anhydride product; c, γ-butyrolactone hydrogenation; and d, refining of a 1,4-butanediol product. Compared with the existing method, the hydrogenation product in the present invention is richer, particularly, succinic anhydride can be co-produced, the conversion rate of maleic anhydride is 99% or above, the total selectivity of 1,4-butanediol, succinic anhydride and other products is 90% or above, and the proportion of each product can be adjusted by properly adjusting the conditions of the first-step hydrogenation reaction of maleic anhydride so as to adapt to market requirements.
Inventors:
ZHU JUNCHENG (CN)
XU ZHIGANG (CN)
WU FEIKE (CN)
HE CHENGGANG (CN)
ZHANG ZUNLIANG (CN)
XU ZHIGANG (CN)
WU FEIKE (CN)
HE CHENGGANG (CN)
ZHANG ZUNLIANG (CN)
Application Number:
PCT/CN2022/099098
Publication Date:
June 29, 2023
Filing Date:
June 16, 2022
Export Citation:
Assignee:
CHANGZHOU RUIHUA CHEMICAL ENGINEERING TECH CO LTD (CN)
International Classes:
C07C29/149; C07C29/80; C07C31/20; C07D307/33; C07D307/60
Foreign References:
| CN114181038A | 2022-03-15 | |||
| US5196602A | 1993-03-23 | |||
| CN107253938A | 2017-10-17 | |||
| CN1255914A | 2000-06-07 | |||
| CN1182732A | 1998-05-27 | |||
| JPH02233632A | 1990-09-17 | |||
| US4795824A | 1989-01-03 | |||
| US4584419A | 1986-04-22 | |||
| US4751334A | 1988-06-14 | |||
| CN103360209A | 2013-10-23 |
Other References:
WU, ZHIGANG; ZHAO, YONG XIANG; DONG, HAI LIN; XU, LIN PING; LIU, DIAN SHENG: "Advances in catalyst systems for hydrogenation of maleic anhydride", MODERN CHEMICAL INDUSTRY, vol. 23, no. 3, 31 March 2003 (2003-03-31), CN , pages 22 - 24, 26, XP009541541, ISSN: 0253-4320
Attorney, Agent or Firm:
BEIJING YINGKE LAW FIRM (CN)
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