Pretreatment of a reactor with alkali metal carbonate and bicarb

Details Pretreatment of a reactor with alkali metal carbonate and bicarb Pretreatment of a reactor with alkali metal carbonate and bicarb

1978-09-01

1980-09-23

Wong, Jr., Harry

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymerizing in reactor of specified material, or in reactor...

C08F 1406

Patent

active

042244242

ABSTRACT:
This invention relates to an improvement for reducing the amount of wall fouling in the suspension polymerization of vinyl chloride in stainless steel reactors. The improvement resides in wetting the reactor surface with a solution containing an alkali metal carbonate or alkali metal bicarbonate or both prior to charging the vinyl chloride recipe to the reactor. The alkaline material is included in a proportion which is effective for reducing wall fouling and typically this concentration is from about 1.25-25 percent for the carbonate and approximately 5-25 percent for the bicarbonate. Preferably, the surface of the reactor, after wetting, is heated to a temperature of about 40-100.degree. C. prior to charging the recipe.

REFERENCES:
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patent: 3559946 (1972-06-01), Koyanagi et al.
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patent: 3778423 (1973-12-01), Reiter
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patent: 3926910 (1975-12-01), Mowdood
patent: 3997707 (1976-12-01), Aruga et al.
patent: 4024301 (1977-05-01), Witenhafer et al.
patent: 4024330 (1977-05-01), Morningstar et al.
patent: 4081248 (1978-03-01), Cohen

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