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公开(公告)号：US20230406807A1
公开(公告)日：2023-12-21
申请号：US18240466
申请日：2023-08-31
发明人： Lei WU , Kunpeng CHENG , Xueming LI , Runrun HONG , Qing'ai SHI , Chuang WANG , Guodong HUANG , Guiyang ZHOU
IPC分类号： C07C67/035 , B01J19/00 , B01J21/06 , B01J23/04
CPC分类号： C07C67/035 , B01J19/0006 , B01J21/066 , B01J23/04
摘要： A method and apparatus for preparing methyl methacrylate (MMA) are provided. The method includes an aldol condensation reaction, a first distillation, a second distillation, a third distillation, a phase splitting, and a fourth distillation. Through the control of the process, the aldol condensation reaction can be performed when methyl propionate is used as the ninth material stream and formalin solution is used as the fifteenth stream material, MMA is obtained as the final product from the third material stream, and the waste with low content of residual formaldehyde is recovered from the eighth material stream.
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公开(公告)号：US20220080400A1
公开(公告)日：2022-03-17
申请号：US17258439
申请日：2019-11-06
申请人： ZHEJIANG NHU COMPANY LTD. , ZHEJIANG UNIVERSITY , SHANDONG NHU PHARMACEUTICAL CO., LTD. , SHANDONG NHU VITAMIN CO., LTD.
发明人： Yong WANG , Zhe WANG , Yutong GONG , Lei WU , Lili YU , Haoran LI , Zhirong CHEN , Xiao MA , Jianyong MAO
摘要： A hydroformylation catalyst, a preparation method thereof and a use thereof. The hydroformylation catalyst including an active component and a carrier carrying the active component, wherein the active component includes a transition metal as a center atom, and a polyhydroxy aromatic ring group bonded to the transition metal; and the transition metal and the polyhydroxy aromatic ring groups are bonded by at least one of metal-hydroxyl coordination bond and at least one of metal-oxygen covalent bond, and the active component has at least one of the metal-hydroxyl coordination bond and at least one of the metal-oxygen covalent bond.
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