Continuous reaction process for urea synthesis of cyclic carbonate and horizontal continuous mixer for raw materials and horizontal continuous reactor

Abstract

A urea synthesis cyclic carbonate continuous reaction process is as follows: polyol, urea and a catalyst are separately and continuously delivered from the front; under the effect of stirring of a mixer, an upper mixer baffle and a lower mixer baffle, the mixture flows out through an outlet port of at a rear portion of the horizontal raw material continuous mixer and enters the horizontal continuous reactor through a reactor raw material inlet port at the front; and a raw material liquid mixture moves from the front to the rear and reacts in the horizontal continuous reactor, an ammonia and a polyol gas that are generated enter directly into a condenser through a gas outlet port of the reactor; the condensed polyol returns to the horizontal continuous reactor; the ammonia goes to a vacuum system; a reaction solution consisted of ungasified polyol, the cyclic carbonate and the catalyst is taken out from a reaction solution outlet port at the rear portion and then goes to a post-treatment process. The urea synthesis cyclic carbonate continuous reaction process, horizontal raw material continuous mixer and horizontal continuous reactor have the advantages of being simple in operation and being convenient for large-scale industrial implementation.

Description

technical field [0001] The invention belongs to a reaction process for preparing cyclic carbonates, in particular to a continuous reaction process for synthesizing cyclic carbonates with urea and polyols as raw materials, a horizontal raw material mixer and a horizontal continuous reactor. [0002] technical background [0003] Cyclic carbonates (ethylene carbonate, propylene carbonate, glycerol carbonate, etc.) are new "green" chemical products that have attracted much attention at home and abroad in recent years. Among them, ethylene carbonate is a good solvent for polyacrylonitrile and polyvinyl chloride. It can be used as a spinning liquid on textiles, and can also be directly used as a solvent for removing acid gases and as an additive for concrete. It can be used as a pharmaceutical agent in medicine. Components and raw materials, can also be used as plastic foaming agent and stabilizer of synthetic lubricating oil, can be used as an excellent solvent for lithium batter...

AI Technical Summary

Problems solved by technology

Although the device can meet the requirements of the production process, it adopts a separate tank-type batch reaction process, which is not convenient for large-scale industrial production.

Chinese patent CN104059047A has invented a continuous reaction process for urea synthesis of cyclic carbonate, a raw material mixer and a tank reactor. It is composed of a special tank reactor, a vacuum system, a reaction liquid heating system, a gas phase condensation reflux system during the reaction process, a vacuum switching discharge tank, and an adjustment control system. Although the process can achieve continuous reaction, the operation control is relatively cumbersome.

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