Reaction kettle for synthesizing carbamates compound by urea method

The utility model discloses a reaction kettle for synthesizing a carbamates compound by a urea method. The reaction kettle comprises a pressure-free or high-pressure reaction kettle body, a gas-liquid mixer and a powerful circulating pump, wherein a liquid inlet is formed in the top of the pressure-free or high-pressure reaction kettle body and a liquid outlet is formed in the bottom of the pressure-free or high-pressure reaction kettle body; the gas-liquid mixer is arranged at the outer part of the reaction kettle body; the gas-liquid mixer comprises a pipe body, a gas inlet nozzle, a gas inlet connector and a liquid outlet connector; the reaction kettle body is connected with the powerful circulating pump by the liquid outlet through a pipeline; the powerful circulating pump is connected with the gas-liquid mixer through a pipeline; the gas-liquid mixer is connected with the liquid inlet at the top of the reaction kettle body through a pipeline to form a circulating system. According to the reaction kettle, the problem that the mass and heat transferring is not uniform is solved, the reaction time is shortened and the industrial scale-up risk is reduced; meanwhile, a by-product ammonia gas generated by a reaction is discharged out of a reaction system in time to push a reaction to forward; the conversion rate and the yield are greatly improved; the reaction kettle is simple and practical, is easy to realize industrialization and has higher economical efficiency.