发明名称 |
BYPRODUCT STREAM PURIFICATION IN THE PREPARATION OF 1,3-PROPANEDIOL-BASED POLYESTERS. |
摘要 |
<p>A process for preparing a 1,3-propanediol-based polyester which comprises contacting an aqueous stream containing acrolein byproduct with a base for a time effective to reduce the acrolein content of the aqueous stream. In a specific embodiment, a poly(propylene terephthalate) preparation process comprises the steps of: (a) contacting 1,3-propanediol and terephthalic acid at elevated temperature to produce a reaction product mixture comprising a poly(propylene terephthalate) and an aqueous solution comprising acrolein; (b) removing a major portion of the aqueous solution from said reaction product mixture; (c) adding a sufficient quantity of a base to the aqueous solution to form a basic solution having a pH greater than 7.5 and maintening the basic solution for a time effective to lower the acrolein content thereof; (d) optionally, diluting the basic solution with water; and (e) optionally, biotreating the dilute basic solution. The process of the invention provides a polyester byproduct stream containing reduced levels of acrolein.</p> |
申请公布号 |
MX9706480(A) |
申请公布日期 |
1997.11.29 |
申请号 |
MX19970006480 |
申请日期 |
1996.02.26 |
申请人 |
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV |
发明人 |
CHARLES CHI-SU CHOU;DONALD ROSS KELSEY |
分类号 |
C08G63/183;C08G63/78;C08G63/90;(IPC1-7):C08G63/78 |
主分类号 |
C08G63/183 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|