发明名称 |
Semi-continuous process for preparing phosphorus trichloride |
摘要 |
There is disclosed an improved process for the semi-continuous production of phosphorus trichloride by the reaction of elemental phosphorus and chlorine in a liquid phosphorus trichloride layer. In accordance with the present invention periodic termination of the process by discontinuing phosphorus feed thereby creating a heel containing residual phosphorus is rendered more safe and less waste is produced by the improvement which comprises chlorinating the residual phosphorus at a substantially constant flow rate and continuing the chlorine feed rate until after observing at least one of either a step-wise decrease in the pressure within the reactor or a step-wise decrease in the flow rate of phosphorus trichloride removed from the reactor and then terminating the chlorine feed when said pressure and flow rate achieve a substantially steady state at a lower value.
|
申请公布号 |
US5252306(A) |
申请公布日期 |
1993.10.12 |
申请号 |
US19920844071 |
申请日期 |
1992.03.02 |
申请人 |
MONSANTO COMPANY |
发明人 |
CHAMPION, JAMES L.;SHEN, CHUNG Y.;YANG, CHEN-HSYONG |
分类号 |
C01B25/10;(IPC1-7):C01B25/10 |
主分类号 |
C01B25/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|