Treatment of hydrolyzer systems in propylene oxide production

Details Treatment of hydrolyzer systems in propylene oxide production Treatment of hydrolyzer systems in propylene oxide production

1994-07-15

1995-09-26

McCarthy, Neil

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

549522, C02F 510

Patent

active

054532043

ABSTRACT:
Production of propylene oxide by hydrolysis of propylene chlorohydrin in an aqueous alkaline reaction medium having a pH above 12 and a temperature of at least about 85.degree. C., is conducted in the presence of a small scale-inhibiting amount of a scale inhibitor added as a water-soluble polymer of acrylic acid having a weight average molecular weight in the range of about 1000 to about 5000, and in the absence of any phosphorus-containing additive component. A significant increase in acrylic polymer performance occurs under these high pH conditions as compared to performance at lower pH. Moreover, experiments have shown that no scale deposits were formed in a hydrolyzer unit operated for 180 days under conditions which normally require removal of deposits after 90 days of operation.

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ACUMER.TM. water treatment polymers brochure, "ACUMER.TM. 2000 Anti-Scale Deposition Polymer For all-Organic Cooling Water Treatment", Copyright 1990, Rohm and Haas Company (14 pages).
ACUMER.TM. water treatment polymers brochure, "ACUMER.TM. 1000 ACUMER.TM. 1020 ACUMER.TM. 1100 ACUMER.TM. 9300 Scale Inhibitors", Copyright 1993, Rohm and Haas Company (22 pages).
Betz, Handbook of Industrial Water Conditioning Eighth Edition, 1980, pp. 197-197.

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