公开(公告)号：WO1995017369A1

公开(公告)日：1995-06-29

申请号：PCT/US1994014540

申请日：1994-12-15

Applicant: EXXON CHEMICAL PATENTS INC.

Inventor： EXXON CHEMICAL PATENTS INC. ,  SALEH, Ramzi, Yanni ,  MICHAELSON, Robert, Charles ,  SUCIU, Elena, Nausicaa ,  KUHLMANN, Barbara

IPC: C07C68/00

CPC classification number: B01J31/122 ,  B01J3/04 ,  B01J19/1881 ,  B01J2219/00101 ,  B01J2219/00155 ,  B01J2219/00162 ,  C07C68/00 ,  C07C69/96

Abstract: A process for making a dialkyl carbonate which comprises reacting urea with a first alcohol in a carbamate reactor at a temperature and pressure sufficient to convert said urea to an alkyl carbamate; and reacting the alkyl carbamate with a second alcohol in the presence of a dialkyl isocyanato alkoxy tin catalyst or derivatives in a carbonate reactor at a temperature and pressure sufficient to convert the alkyl carbamate to a dialkyl carbonate, wherein the molar ratio of alkyl carbamate to second alcohol is in the range between about 2:1 to about 10:1 and wherein dialkyl carbonate is present within the carbonate reactor in an amount between about 1 to about 3 weight %, based on total alkyl carbamate and second alcohol content, and wherein the second alcohol is either the same as or different from the first alcohol or a mixture of alcohols.

Abstract translation: 一种制备碳酸二烷基酯的方法，其包括使氨基甲酸酯反应器中的脲与第一醇在足以将所述脲转化为氨基甲酸烷基酯的温度和压力下反应; 和在碳酸酯反应器中的二烷基异氰酸酯基烷氧基锡催化剂或其衍生物的存在下，使烷基氨基甲酸酯与第二种醇反应，其温度和压力足以将氨基甲酸烷基酯转化为碳酸二烷基酯，其中氨基甲酸烷基酯与第二 醇在约2:1至约10:1之间的范围内，其中碳酸二烷基酯在碳酸酯反应器内以基于总烷基氨基甲酸酯和第二醇含量为约1至约3重量％的量存在，并且其中 第二醇与第一种醇或醇的混合物相同或不同。