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Method for preparing polyvinyl alcohol and polyvinyl acetate latex by use of the bottom residue from vinyl acetate production process
Method for preparing polyvinyl alcohol and polyvinyl acetate latex by use of the bottom residue from vinyl acetate production process
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机译:利用醋酸乙烯酯生产过程中残渣制备聚乙烯醇和醋酸乙烯酯胶乳的方法
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摘要
A method for preparing polyvinyl alcohol and polyvinyl acetate latex by use of a kettle bottom residue from vinyl acetate production process includes: distilling a kettle bottom residue of vinyl acetate to obtain a crude acetic acid and a distillation residue; multiple washing the distillation residue with water under boiling condition to obtain a washing residue containing polyvinyl acetate; dissolving a first portion of the washing residue into a first solvent to obtain a first polyvinyl acetate solution; subjecting the first polyvinyl acetate solution to saponification with an alkali aqueous solution; dissolving a second portion of the washing residue into a second solvent; and dispersing the second polyvinyl acetate solution into the polyvinyl alcohol solution, and optionally recovering the solvent to obtain a polyvinyl acetate latex; or adding the second polyvinyl acetate solution into an emulsion reaction system and optionally recovering vinyl acetate, to obtain a polyvinyl acetate latex.
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