Steam distillation of polyvinyl chlorine slurry in presence of m

Details Steam distillation of polyvinyl chlorine slurry in presence of m Steam distillation of polyvinyl chlorine slurry in presence of m

1975-03-24

1976-08-17

Bascomb, Jr., Wilbur L.

Concentrating evaporators

Processes

Involving waste liquid

159 16S, 159DIG10, 203 33, 203 39, 203 53, 203 96, 260 296PT, 528500, 526344, B01D 114, B01D 338, C08F11402

Patent

active

039752305

ABSTRACT:
An improvement in the process for removing vinyl chloride from a water-polyvinyl chloride slurry, which contains unreacted vinyl chloride, by steam distillation is disclosed. In many instances, steam distillation of the slurry results in an increase in the number of gels or fish eyes. The improvement comprises conducting the steam distillation in the presence of a minor, but effective, amount of an alkali metal sulfite or carbonate. The improved process results in a polyvinyl chloride having no substantial increase in, or a reduced amount of, gels or fish eyes, while still having good heat stability and porosity properties.

REFERENCES:
patent: 2662867 (1953-12-01), Hoertz
patent: 3052663 (1962-09-01), Boedlander et al.
patent: 3053820 (1962-09-01), Weschler et al.
patent: 3414547 (1968-12-01), Thompson et al.
patent: 3440148 (1969-04-01), Melancini et al.

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