C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/482
C08F 6/10 (2006.01) C08F 6/00 (2006.01)
Patent
CA 1139496
C-14-53 0232 PROCESS FOR REMOVING UNREACTED MONOMERS FROM POLYMERIZATION SLURRIES ABSTRACT OF THE DISCLOSURE The method of recovering unreacted mono-olefinic monomers from an acrylonitrile polymerization slurry contain- ing 30 to 50 weight percent of polymer solids and 70 to 50 weight percent of unreacted monomers wherein the slurry is first diluted with a solvent for the polymer and then fed in series through first and second treatment zones, with each of the treatment zones having a first stage for mixing the slurry with a solvent in vapor form to vaporize some of the unreacted monomers from the slurry and form a polymer solu- tion and a second stage for separating monomer vapors from the liquid polymer solution. Fresh solvent, in vapor form and at an elevated temperature is supplied to the mixing stage of the second treatment zone and the vaporized solvent and unreacted monomers from the separation stage of the sec- ond treatment zone are fed to the mixing stage of the first treatment zone. The preferred ratio of solvent to slurry being fed to the mixing stages is 0.8 to 1.2. The slurry leaving the separation stage of the second treatment zone has a very low content of unreacted monomers.
325181
Armstrong Arthur A.
Baur Gerd R.
Carpenter Charles N.
Folk Edwin W.
Stookey Donald J.
Mcfadden Fincham
Solutia Inc.
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