发明名称 |
PROCESS |
摘要 |
<p>A continuous process is described for the production of a substantially acid free dialkyl maleate, for example diethyl maleate, from a feed stream containing a major amount of dialkyl maleate and a minor amount of the corresponding monoalkyl maleate. This comprises continuously distilling the feed stream in a primary distillation zone, which can comprise a single distillation column or a series of distillation columns connected in series, so as to give (i) a bottom fraction containing monoalkyl maleate and dialkyl maleate in admixture, (ii) a vaporous fraction comprising alkanol, and (iii) an intermediate fraction that is substantially free from alkanol and comprises a major proportion of diethyl maleate and a minor proportion of maleic anhydride. The intermediate fraction (iii) is redistilled in a secondary distillation zone to yield (i) an overhead fraction containing maleic anhydride and (ii) a bottom fraction containing substantially acid free dialkyl maleate. The vaporous stream can be condensed to recover alkanol for recycle to a dialkyl maleate production facility.</p> |
申请公布号 |
GR3001824(T3) |
申请公布日期 |
1992.11.23 |
申请号 |
GR19910400232T |
申请日期 |
1991.04.23 |
申请人 |
DAVY MCKEE (LONDON) LIMITED |
发明人 |
HARRIS, NORMAN;RATHMELL, COLIN;TURNER, KEITH;SCARLETT, JOHN |
分类号 |
C07C67/60;C07C67/08;C07C67/54;C07C69/60;(IPC1-7):C07C69/60 |
主分类号 |
C07C67/60 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|