Washing method for distillation system of nitrogen-containing polymerizable monomers
AssigneeNippon Shokubai Co., Ltd.
InventorsYoshihisa Oka, Kenichi Takematsu
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Abstract
There is provided a method of efficiently removing polymer stuck to the inside and/or on the surface of packings of a distillation tower, when nitrogen-containing polymerizable monomers (for example, ethyleneimine) are distilled. Said method consists of washing the inside and/or packings of a distillation tower with an acidic liquid (for example, aqueous solution of acetic acid).
Claims10
A method for washing a distillation system which has been used for distilling alkyleneimines, comprising the steps of providing a distillation system having polymerized alkyleneimines therein, and washing an inside of the distillation system with an acidic liquid to remove the polymerized alkyleneimines therein.
A method for washing packings packed in a distillation system which has been used for distilling alkyleneimine, comprising the steps of providing a distillation system having packings therein, said packings having alkyleneimines therein, and washing said packings of the distillation system with an acidic liquid to remove the polymerized alkyleneimines therein.
Dependencies are inferred from the claim text.