Process of continuously hydrolyzing acrylic fiber silk waste to produce polyacrylonitrile ammonium salt
The invention belongs to the field of chemical industry, and discloses a process of continuously hydrolyzing acrylic fiber silk waste to produce polyacrylonitrile ammonium salt . The method comprises the steps of: using waste polyacrylonitrile fiber as a raw material, and obtaining a concentrated hy...
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Zusammenfassung: | The invention belongs to the field of chemical industry, and discloses a process of continuously hydrolyzing acrylic fiber silk waste to produce polyacrylonitrile ammonium salt . The method comprises the steps of: using waste polyacrylonitrile fiber as a raw material, and obtaining a concentrated hydrolyzed liquid by continuously and sequentially feeding the waste polyacrylonitrile fiber to a first hydrolysis kettle, a second hydrolysis kettle and a third hydrolysis kettle; the hydrolyzed liquid entering a plurality of vacuum evaporators that are connected in series in sequence, for further concentration; finally the hydrolyzate entering a dryer so that a solid finished product of polyacrylonitrile ammonium salt is obtained. According to the method, continuous high temperature and high pressure hydrolysis can be performed on the waste polyacrylonitrile fiber, so that the production manner is changed from an intermittent manner to a continuous manner, thereby avoiding a cumbersome process of periodic feeding-temperature boosting and pressure boosting- hydrolysis-discharging-emptying-pressure relieving-opening a lid and filling-and the like of a high temperature and high pressure hydrolysis kettle, and improving working efficiency. The hydrolysis rate reaches 100%. The method is not only beneficial to energy saving and emission reduction, reducing environmental pollution, improving working environment and raising labor productivity, but is beneficial to keeping product quality balanced and stable. |
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