发明名称 |
PROCESS FOR PREPARING A PARTICULARLY PURE GLYCOLIC ACID |
摘要 |
The present invention relates to a process for preparing a particularly pure glycolic acid by saponification with chloroacetic acid with an excess of alkali metal hydroxide, with the resulting alkali metal chloride being filtered off, and the 20 to 70% strength by weight glycolic acid solution being subsequently subjected to anelectrodialysis at 20 to 40.degree.C and a cell voltage of 0.5 to 2.5 V per cell pair. The process of the invention permits optimum removal of sodium chloride and chloroacetic acid as necessary for preparing a particularly pure glycolic acid. Other organic acids, nitrogen compounds, aldehydes and salts are not produced in this process and thus do not affect the product quality.
|
申请公布号 |
CA2194739(A1) |
申请公布日期 |
1997.07.11 |
申请号 |
CA19972194739 |
申请日期 |
1997.01.09 |
申请人 |
HOECHST AKTIENGESELLSCHAFT |
发明人 |
EBMEYER, FRANK;HABERLEIN, HARALD;MOHN, HOLGER |
分类号 |
B01D61/44;C07C51/367;C07C51/42;C07C59/06;(IPC1-7):C07C59/06 |
主分类号 |
B01D61/44 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|