Patent ID: 7951886
Filing Date: 2011-05-31
Classification: B01J,C08F

Abstract:
1. A continuous production method of a water-soluble polymer, comprising: circulating a circulation liquid containing a monomer having a polymerizable unsaturated bond through a reaction apparatus having a tank and a circulation line comprising a piping circulating outside the tank, and thereby producing a water-soluble polymer continuously; and discharging part of the circulation liquid from a discharge line, wherein the circulation line is provided with a cooling device at least at one position; wherein a circulation ratio being calculated by dividing an amount of liquid returning to the tank by an amount of liquid discharged from the discharge line to the outside of the production apparatus is 3 or more and wherein a retention time of the circulation liquid in the tank and the circulation line (=a total amount of a reaction liquid /an amount of the reaction liquid discharged per unit time) is 240 minutes or less, and wherein in the reaction apparatus, the tank, the cooling device, and the raw material supply port are disposed in this order in the flow passage direction of the circulation liquid, and the discharge line is positioned between the tank and the cooling device or the tank, the raw material supply port and the cooling device are disposed in this order in the flow passage direction of the circulation liquid, and the discharge line is positioned between the tank and the raw material supply port.