Patent ID: 8974642
Filing Date: 2015-03-10
Classification: B01D,C01B,Y10S

Abstract:
1. A trihalosilane refining method, comprising: introducing a feed containing a trihalosilane into a divided wall distillation column having a divided wall, which has a length of at least 30% with respect to a total theoretical plate number thereof, installed therein; and introducing an effluent flowing out from the divided wall distillation column into a first distillation column, wherein the divided wall distillation column comprises an upper column region, a preliminary separation region, a main separation region and a lower column region, and has an inlet port installed therein to introduce the feed containing a trihalosilane into the preliminary separation region, a first outlet port, a second outlet port and a third outlet port, wherein the effluent flowing out through the second outlet port is introduced into the first distillation column, wherein the second outlet port or the effluent flowing out through the second outlet port is maintained at a temperature of 86.4° C. to 116.4° C., 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.