Method for producing (meth)acrylic acid and (meth)acrylic esters
AssigneeShanghai Huayi Acrylic Acid Co., Ltd.
InventorsJingming Shao, Jun Yin, Shuju Liu, Xiaodong Chu, Shengxian Xu
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Abstract
There is provided a method for rectifying a vinyl compound liquor. The method includes the steps of a) providing a rectification column operated at a temperature and pressure and b) feeding the vinyl compound liquor to be rectified into the rectification column, wherein the pressure of the rectification column and the temperature of the fed vinyl compound liquor are controlled, such that the temperature of the fed vinyl compound liquor ranges from its bubble point at the pressure of the rectification column to 10° C. lower than the bubble point.
Claims8
A method for rectifying a vinyl compound liquor, comprising:
- a) providing a rectification column operated at a temperature of from 40 to 130° C. and a pressure of from 1 to 80 kPa;
- b) feeding the vinyl compound liquor into the rectification column, which is heated by the operating temperature of the rectification column in a), when an overhead output in the rectification column is more than a bottom discharge, said vinyl compound liquor comprises a vinyl compound, said vinyl compound is one selected from the group consisting of (meth)acrylic acid, (meth)acrylate salt and (meth)acrylic esters;
- wherein
- the temperature of said fed vinyl compound liquor is controlled to be in a range of from its bubble point at the pressure of said rectification column to 10° C. lower than said bubble point, so that the rectification column is not clogged caused by spontaneous polymerization of the vinyl compound.
Dependencies are inferred from the claim text.