Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound
Patent
1982-09-20
1983-09-06
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
Adding material to distilland except water or steam per se
Organic compound
203 52, 203 68, 203 70, 203 84, 556466, 556472, B01D 340, C07F 720
Patent
active
044027974
ABSTRACT:
An improved method for the separation of close-boiling chlorosilanes is described. The method consists of the extractive distillation of the close-boiling chlorosilanes using sulfolane as the extractive solvent and thereafter separating the higher-boiling chlorosilane and sulfolane by distilling the higher-boiling chlorosilane from the higher-boiling chlorosilane and sulfolane mixture to which is added a hydrocarbon solvent. Preferred hydrocarbon solvents include normal-heptane, normal-nonane, and 2,2,4-trimethylpentane. The sulfolane obtained from the higher-boiling chlorosilane and sulfolane mixture is suitable for recycling to the extractive distillation process as the sulfolane contains only limited amounts of dissolved chlorosilane.
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Halm Roland L.
Rentsch Stefan F.
Bascomb, Jr. Wilbur L.
Dow Corning Corporation
Kaba Richard A.
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