Water-saving and environment-friendly chlorinated polyethylene production method

Abstract

The invention discloses and provides a water-saving and environment-friendly chlorinated polyethylene production method and belongs to the field of chlorinated polyethylene preparation. The method comprises the specific steps as follows: water is added to a chlorination reactor firstly; water in the reactor is heated, polyethylene, magnesium oxide and a reaction aid are added after stirring is started, and heating is started; liquid chlorine is introduced into the reactor, the chlorine ratio is 50%-60% when the reaction temperature is increased to 130 DEG C from 60 DEG C, the rest liquid chlorine is introduced at the constant temperature of about 130 DEG C, and the reaction is ended when the set chlorine introduction amount is reached; centrifugal separation and drying are performed on thematerial in the reactor, and chlorinated polyethylene and industrial magnesium chloride are prepared. The problem of corrosion to a centrifuge screen due to short-term contact with high-concentrationhydrochloric acid is solved, equipment loss is reduced, and the service life of equipment is prolonged; washing of acid with a lot of water is avoided, the water resource is saved, the phenomenon that acid is not thoroughly washed with water is avoided, and the acid is washed thoroughly; meanwhile industrial magnesium chloride can be produced.

Description

technical field [0001] The invention belongs to the field of chlorinated polyethylene rubber preparation, and in particular relates to a water-saving and environment-friendly production method of chlorinated polyethylene. Background technique [0002] The current water phase process is polyethylene (PE) in water phase with CL 2 The reaction produces CPE, the concentration of by-product hydrochloric acid is 7-8%, and hydrochloric acid will induce the decomposition of CPE during the processing of CPE and cause the quality of the finished product to decrease. It is also necessary to use a neutralization tank to add alkali to neutralize to further remove the acid inside the CPE. In 2017, the domestic output of chlorinated polyethylene (CPE) in my country was about 900,000 tons, most of which were produced by the water phase method. Deacidification was carried out to separate CPE from hydrochloric acid. After deacidification, the CPE wet material was washed by process water to f...

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Problems solved by technology

[0003] The present invention provides a water-saving and environment-friendly production method of chlorinated polyethylene to solve the existing problems. Appropriate magnesium oxide is added to the raw material, which can react with the remaining acid through a reasonable process flow, and solves the problem of the centrifuge screen. Corrosion caused by short-term contact with high-concentration hydrochloric acid reduces equipment loss and improves equipment service life; avoids using a large amount of water to flush the acid, saves water resources, and avoids the phenomenon that the acid cannot be cleaned with water. Clean thoroughly; at the same time, it can also generate industrial magnesium chloride, which meets the quality requirements of GB / T2605-2003 (industrial magnesium chloride)

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