Process for removing insoluable N-vinyl amide polymer from equipment
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United States of America Patent
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Jun 23, 1998
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app pub date -
Apr 4, 1995
filing date -
Apr 4, 1995
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Abstract
Insoluble polymer formed during the distillation of N-vinylformamide is removed by contacting the insoluble polymer with an aqueous weakly basis solution in a closed system at elevated temperature. Polymer (up to 50 wt % polymer gel or 5.5 wt % dry polymer in reaction mixture) is treated with an aqueous solution of an amine, alkanolamine or weak inorganic base having a concentration of at least 1 molar. Solvents like alcohols, glycol ethers or amides may be added as a cosolvent in an amount of from 0 to about 85% by weight.
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