Process for removal of chloroform and carbon tetrachloride from

Details Process for removal of chloroform and carbon tetrachloride from Process for removal of chloroform and carbon tetrachloride from

1977-10-11

1979-04-03

Levin, Stanford M.

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

Synthetic resins

Treating polymer containing material or treating a solid...

526 17, 528495, 528497, 528498, C08F 822

Patent

active

041478592

ABSTRACT:
A process is disclosed for continuously stripping chloroform (CHCl.sub.3) and carbon tetrachloride (CCl.sub.4) contaminants from a slurry of agglomerated particles or macro-granules of chlorinated polyvinyl chloride (CPVC) utilizing a stripping agent chosen from a lower primary alcohol and a lower normally liquid alkane. In this process, the stripping agent has a peculiar affinity for each of these contaminants, does not dissolve or otherwise deleteriously affect the CPVC macro-granules, and efficiently reduces the level of the contaminants in the CPVC to less than 10 ppm each of CHCl.sub.3 and CCl.sub.4, based on solid resin.

REFERENCES:
patent: 2996489 (1961-08-01), Dannis et al.
patent: 3100762 (1963-08-01), Shockney
patent: 3167535 (1965-01-01), Gateff et al.
patent: 3355442 (1967-11-01), Taylor
patent: 3454542 (1969-07-01), Cheape et al.

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