Patent ID: 7767160

Claim:
An apparatus for continuously producing polyisocyanate by reacting polyamine with carbonyl chloride, comprising: a reactor and a circulatory unit for circulating a reaction solution to the reactor, the circulatory unit comprising: 1) a circulatory line for circulating the reaction solution, 2) polyamine supplying unit for supplying polyamine to the circulatory line, 3) carbonyl chloride supplying unit for supplying carbonyl chloride to the circulatory line, 4) polyamine-carbonyl chloride contacting unit for contacting the polyamine supplied from the polyamine supplying unit to the circulatory line and the carbonyl chloride supplied from the carbonyl chloride supplying unit to the circulatory line in the presence of the circulating reaction solution, and 5) mixing unit for mixing the carbonyl chloride and the polyamine contacted by the contacting unit, and the circulated reaction solution by shearing, wherein the polyamine supplied from the polyamine supplying unit, the carbonyl chloride supplied from the carbonyl supplying unit, and the reaction solution substantially form three layers from the contacting unit to the mixing unit.