Patent ID: 8968521
Filing Date: 2015-03-03
Classification: B01D,C01B,Y10S

Abstract:
1. A trihalosilane refining method, comprising: supplying a feed containing a trihalosilane into a divided wall distillation column; and introducing an effluent flowing out from the divided wall distillation column into a first distillation column, wherein the divided wall distillation column has an upper column region, a preliminary separation region, a main separation region and a lower column region formed therein, and comprises: an inlet port installed to introduce a feed containing a trihalosilane into the preliminary separation region; a first outlet port installed to enable outflow of a component in the upper column region; a second outlet port installed to enable outflow of a component in the main separation region; and a third outlet port installed to enable outflow of a component in the lower column region, wherein operating conditions of the divided wall distillation column are adjusted to satisfy the following Expressions 2 and 3, wherein the component flowing out through the second outlet port is introduced into the first distillation column, and wherein the first distillation column is maintained at an operating pressure of −0.6 Kg/sqcmG to 9.0 Kg/sqcmG and an operating temperature of 37° C. to 145° C.: wherein Tt represents a temperature of the first outlet port or the component flowing out through the first outlet port, Tb represents a temperature of the third outlet port or the component flowing out through the third outlet port, and P represents an operating pressure of the upper column region of the divided wall distillation column.