Process and apparatus for treating polyvinyl alcohol...

Details Process and apparatus for treating polyvinyl alcohol... Process and apparatus for treating polyvinyl alcohol...

C - Chemistry, Metallurgy

08

F

23/376, 402/496

C08F 116/06 (2006.01) C02F 1/58 (2006.01) C08J 11/00 (2006.01)

Patent

CA 1073597

ABSTRACT OF THE DISCLOSURE A process and an apparatus for treating waste liquid containing polyvinyl alcohol (hereinafter will be called PVA) wherein the waste liquid which is generated through textile pro- duct treating processes such as desizing, scouring, etc. is col- lected in a reaction tank. Reaction is carried out in the tank by adding a PVA binder such as formalin, salt cake, soda ash, bo- rax, etc. with air or steam blown in as required to produce the insoluble solid of PVA. The insoluble solid of PVA is separated from the waste liquid and an apparatus comprising a waste liquid treating reaction tank, a chemical tank, an air or steam blowing- in mechanism, a centrifugal separator or a filtrating mechanism with a timing control mechanism, a treating liquid reservoir, a solid receiving tank, etc.

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