Title:
METHOD FOR PREPARING POLYVINYL ALCOHOL AND POLYVINYL ACETATE LATEX BY USE OF THE BOTTOM RESIDUE FROM VINYL ACETATE PRODUCTION PROCESS
Document Type and Number:
WIPO Patent Application WO/2010/066193
Kind Code:
A1
Abstract:
A method for preparing polyvinyl alcohol and polyvinyl acetate latex by use of the bottom residue from vinyl acetate production process comprises: (1)distilling the bottom residue from vinyl acetate production process to obtain crude acetic acid and still residue;(2)washing the said still residue with water many times under boiling condition to obtain the washing residue containing polyvinyl acetate;(3)dissolving the first portion of the said washing residue into the first solvent to obtain the first polyvinyl acetate solution;(4)reacting the first polyvinyl acetate solution with an alkali aqueous solution to carry out saponification so as to obtain polyvinyl alcohol solution;(5)dissolving the second portion of the said washing residue into the second solvent to obtain the second polyvinyl acetate solution; and (6) dispersing the second polyvinyl acetate solution into the said polyvinyl alcohol solution or adding the second polyvinyl acetate solution into a reaction system containing the said polyvinyl alcohol solution, emulsifier, vinyl acetate and initiator to react.
Inventors:
WAN XIAOWEN (CN)
Application Number:
PCT/CN2009/075428
Publication Date:
June 17, 2010
Filing Date:
December 09, 2009
Export Citation:
Assignee:
WAN XIAOWEN (CN)
International Classes:
C08F18/08; C07C69/15; C08F116/06
Foreign References:
| CN1231296A | 1999-10-13 | |||
| SU878761A1 | 1981-11-07 | |||
| DE3408239A1 | 1985-09-26 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (Scitech PlaceNo.22, Jian Guo Men Wai Ave., Chao Yang District, Beijing 4, CN)
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