Patent ID: 8038958

Claim:
An apparatus for decomposing and recovering an isocyanate compound, which comprises: a reactor adapted to bring water at high pressure and high temperature into contact with an isocyanate compound having at least one isocyanate group or group derived from an isocyanate group to cause a decomposition reaction; a water supply line adapted to continuously supply the water at high pressure and high temperature to the reactor; a compound supply line adapted to continuously supply isocyanate compound in a molten state or solution state to the water supply line; an on-off valve adapted to communicate the compound supply line with a vicinity of a communication portion of the water supply line to the reactor; a dehydrating device adapted to conduct a dehydration of a decomposition reaction product discharged from the reactor; and a purification device adapted to purify the decomposition reaction product after the dehydration, wherein the reactor includes: a vertical cylindrical vessel body having a discharge port for the decomposition reaction product at the top thereof and a liquid mixture supply port in communication with the water supply line at the bottom thereof, and a liquid swirling device disposed in the vessel body, which ascends a liquid mixture entering from the liquid mixture supply port as a swirling flow, and wherein the liquid swirling device includes: a blade support member disposed at the radial center of the vessel body, and a spiral blade fixed spirally to the blade support member, the spiral blade having an outer circumferential end which contacts with the inner peripheral surface of the vessel body.