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Recovery of polyvinyl chloride from tetra:hydro-furan - by addn. water with surfactant to prevent deposit
Recovery of polyvinyl chloride from tetra:hydro-furan - by addn. water with surfactant to prevent deposit
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机译：通过加成从四氢呋喃中回收聚氯乙烯。含表面活性剂的水以防止沉积
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摘要
The parent patent refers to a method of separating PVC from soln. in THF, in which the water content is adjusted to 10-50 wt. % before distn. In this addn. 0.1-3.0%, wrt. to the water, of a surfactant is also added before distn. The original method effected practically complete recovery of THF leaving a PVC residue which was easily removable from the distn. vessel and easy to filter. Because of the complete separation of tetrahydrofuran the residue was neither noxious nor polluting. However, the method caused a deposit to form on the wall of the distn. vessel which has to be removed mechanically. The addn. of a surfactant eliminates this defect.
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