Steam inside-heat-transfer type composite reaction kettle for AC foaming agent

Abstract

The invention relates to a steam inside-heat-transfer type composite reaction kettle for an AC foaming agent. By being controlled by a DCS system, the composite reaction kettle is used for condensation reaction of biurea. The purity of an obtained product is more than 99 percent, and the yield of hydrazine hydrate by virtue of the biurea is within 96-98 percent. By a special design, heating components (11) which are adjustable in number and area are arranged in the kettle, the heating components are in looped connection and convenient to mount and dismount, and the kettle is changeable in size; a steam distribution part (9) and a waste heat steam recovery part (14) are connected outside the kettle and can ensure that condensate water is not deposited in the heating components. By virtue of the DCS system, according to the monitoring of the real-time kettle temperature and the kettle pressure in the kettle, the temperature in the kettle can be quickly adjusted, the temperature rise rate and the holding temperature of the reaction are accurately controlled, the occurrence of side reaction is reduced, the raw material waste and potential safety hazards caused by the violent reaction are effectively prevented, the purity of the product is greatly improved and the yield of the product is greatly increased. Meanwhile, steam and cooling water can be used to the maximum extent, and steam and water resources are saved.

Description

technical field [0001] The invention relates to a reactor, in particular to an AC foaming agent steam internal heat transfer composite reactor controlled by a DCS system. Background technique [0002] The traditional reaction kettles used in the preparation of biurea by the urea method in AC foaming agent are all jacketed enamel kettles. During the entire preparation reaction process of biurea, the temperature changes, the pH value changes, and the changes in the state of the material are very obvious. The overall anti-corrosion performance and durability have higher requirements. [0003] Reactor mainly contains in the prior art of domestic AC foaming agent urea method diurea preparation existing technology at present: 1, enamel reaction kettle, double enamel in the kettle, jacket type heating, stirring device is also enamel; 2, Chinese Patent Publication No. CN 202015614U Publication date October 26, 2011, introduced a foaming agent condensation reaction kettle, the react...

AI Technical Summary

Problems solved by technology

Directly use point and line heating, the heating area is limited, and the disadvantage is that the heating rate is slow

[0004] The Chinese Patent Publication No. CN201720056 discloses a reaction kettle with a heater, which consists of a kettle body, a kettle cover, a fixed body, a feed inlet, a discharge outlet, a stirrer and a tubular heater. The heater has two upper and lower heaters. Two pipes are connected to the outside of the reactor body. If the cross-sectional area of ​​the reactor heater is large, it will affect the normal operation of the agitator inside the reactor. On the contrary, if the area is small, the theoretical temperature and uniform effect cannot be achieved.

However, if the temperature rises too fast and too high during the condensation reaction, accidents may occur

Images