Solvent system and method for removing polymer scale from vinyl

Details Solvent system and method for removing polymer scale from vinyl Solvent system and method for removing polymer scale from vinyl

1997-11-19

1998-07-21

Warden, Jill

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

134 2, 134 221, 134 2216, 134 2217, 134 35, 134 38, 134 40, 510188, 510435, 510499, 510505, 510506, B08B 900

Patent

active

057829896

ABSTRACT:
Polymer scale removal from vinyl polymerization reactors is effected without the use of polar aprotic solvents or aromatic solvents, by adding to the reactor, a scale removal composition comprising acetone, a most minor amount of a strong base, and a minor amount of a hydroxyl- or amino-functional polar organic solvent. The composition may contain surfactants, chelating or sequestering agents, detergent builders, and the like, and water in amounts of up to about 3 weight percent. Scale removal is efficient and rapid when the scale removing composition is agitated in the reactor at temperatures ranging from about 50.degree. C. to 120.degree. C.

REFERENCES:
patent: 4098972 (1978-07-01), Ogawa et al.
patent: 4588613 (1986-05-01), Liau et al.
patent: 4661569 (1987-04-01), Kleine et al.
patent: 5424003 (1995-06-01), Shimizu et al.

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