Patent ID: 8859809
Filing Date: 2014-10-14
Classification: B01D,C07C

Abstract:
1. A process for crystallizing (meth)acrylic acid using a device for crystallizing (meth)acrylic acid, wherein the device for crystallizing (meth)acrylic acid includes: a crude (meth)acrylic acid solution supply part, a crystallization tube, a heat medium supply tube, a heat medium discharge tube, a storage part of a crude (meth)acrylic acid solution passed through the crystallization tube, a tube for circulating and supplying the crude (meth)acrylic acid solution to the supply part from the storage part, and a pump for circulating and supplying the crude (meth)acrylic acid solution to the supply part from the storage part; and a pressure meter in the circulate-supply tube, the device being used for carrying out dynamic crystallization in a batch manner by circulating the crude (meth)acrylic acid solution to flow the crude solution downward along the inner wall of the crystallization tube in a coating film-like state, said process for crystallizing (meth)acrylic acid comprising: decreasing a circulation flow rate of the crude (meth)acrylic acid solution to the supply part from the storage part when the pressure value measured by the pressure meter exceeds a predetermined value.