Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Reexamination Certificate
2007-09-18
2007-09-18
Anderson, Rebecca (Department: 1626)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
C502S329000, C502S224000, C502S226000, C502S342000, C502S104000, C502S107000, C502S113000, C502S115000, C502S116000, C502S133000, C502S134000, C502S151000, C502S178000, C502S181000, C502S182000, C502S183000, C502S184000, C502S304000, C502S324000, C502S328000
Reexamination Certificate
active
11209052
ABSTRACT:
A catalyst for the preparation of dimethyl carbonate from urea and methanol having a composition on weight base of: active component of from 20 to 50 wt %, and carrier of from 80 to 50 wt %, and prepared by equal-volume spraying and impregnating method is disclosed. The method for the synthesis of dimethyl carbonate can be carried out in a catalytic rectification reactor, said method comprising: (1) dissolving urea in methanol to form a methanol solution of urea; and (2) feeding the methanol solution of urea and methanol counter-currently into the reaction zone, wherein the reaction is carried out at conditions including reaction temperature of from 120° C. to 250° C., reaction pressure of from 0.1 MPa to 5 MPa, kettle bottom temperature of from 70° C. to 210° C., stripping section temperature of from 70° C. to 250° C., rectifying section temperature of from 70° C. to 280° C., and reflux ratio of from 1:1 to 20:1. The preparation of the catalyst according to the present invention is simple and has good repeatability, and the catalyst could further enhance the yield of DMC as well as conversion of urea in the catalytic rectification reactor.
REFERENCES:
patent: 4900705 (1990-02-01), Sawicki et al.
patent: 5436362 (1995-07-01), Kondoh et al.
patent: 478073 (1991-09-01), None
Chen Yanjun
Sun Baoyuan
Sun Yuhan
Wei Wei
Zhang Bingsheng
Anderson Rebecca
Chu Yong
Feicheng Acid Chemicals Co., Ltd.
Hunton & Williams LLP
Institute of Coal Chemistry, Chinese Academy of Sciences
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