Method for removing polymer scale deposited on reactor walls and

Details Method for removing polymer scale deposited on reactor walls and Method for removing polymer scale deposited on reactor walls and

1985-03-12

1986-05-27

Corbin, Arthur L.

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

134 2219, 134 28, 134 29, 252144, 252159, 252163, 252164, 252165, B08B 900

Patent

active

045913919

ABSTRACT:
The invention provides an efficient method for removing polymer scale deposited on the walls of the polymerization reactor after completion of a polymerization run of an ethylenically unsaturated monomer, e.g. vinyl chloride, in an aqueous medium. The polymer scale adhering to the walls is soaked with a scale-remover solution containing a soluble cellulose derivative, such as ethyl cellulose, hydroxypropyl methyl cellulose and the like, applied thereto and, after standing as wet for a while, washed down easily with water. Certain additives to the solution, e.g. acids, alkalis, paraffins and emulsifying agents, may further enhance the effectiveness of the remover solution.

REFERENCES:
patent: T957003 (1977-04-01), Freshour
patent: 3356614 (1967-12-01), Gilbert
patent: 3574123 (1971-04-01), Laugle
patent: 3619295 (1971-11-01), Nishizaki et al.
patent: 3954648 (1976-05-01), Belcak et al.
patent: 4274884 (1981-06-01), Cartwright
patent: 4370174 (1983-01-01), Braithwaite

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