公开(公告)号：US07271120B2

公开(公告)日：2007-09-18

申请号：US11209052

申请日：2005-08-22

Applicant: Yuhan Sun ,  Wei Wei ,  Ning Zhao ,  Baoyuan Sun ,  Bingsheng Zhang ,  Yanjun Chen

Inventor： Yuhan Sun ,  Wei Wei ,  Ning Zhao ,  Baoyuan Sun ,  Bingsheng Zhang ,  Yanjun Chen

IPC: B01J31/02 ,  B01J371/10 ,  B01J6/00

CPC classification number: B01J23/14 ,  B01J23/02 ,  B01J23/06 ,  B01J23/10 ,  B01J23/34 ,  C07C68/00 ,  Y02P20/127 ,  C07C69/96

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.

Abstract translation: 用于由尿素和甲醇制备碳酸二甲酯的催化剂，其重量基础为：活性组分为20至50重量％，载体为80至50重量％，并通过等体积喷涂和浸渍法制备 被披露。 合成碳酸二甲酯的方法可以在催化精馏反应器中进行，所述方法包括：（1）将脲溶于甲醇中形成尿素甲醇溶液; 和（2）将尿素和甲醇的甲醇溶液反向进料到反应区中，其中反应在包括反应温度为120℃至250℃的条件下进行，反应压力为0.1MPa至 5MPa，釜底温度为70℃至210℃，汽提段温度为70℃至250℃，精馏段温度为70℃至280℃，回流 比例为1：1至20：1。 根据本发明的催化剂的制备是简单的并且具有良好的重复性，并且催化剂可以进一步提高DMC的收率以及催化精馏反应器中尿素的转化率。