Tetrachloroethylene production device and method

Abstract

The invention discloses a tetrachloroethylene production device and a tetrachloroethylene production method. The tetrachloroethylene production device comprises a first-stage chlorination reactor, a second-stage chlorination reactor, a cooling washing tower, a condenser, a hydrochloric acid absorbing tower, a fractionating tower and a rectifying tower, wherein chlorine and chloride methane material pipelines are arranged on the first-stage chlorination reactor; dichloromethane and trichloromethane material pipelines are arranged on the second-stage chlorination reactor. According to the tetrachloroethylene production device, the second-stage chlorination reactor is arranged additionally; after the dichloromethane and the trichloromethane are filled in the second-stage chlorination reactor, the excess chlorine in the outlet gas of the first-stage chlorination reactor is converted completely; and the rest of dichloromethane and trichloromethane are fractionated to return into the first-stage chlorination reactor to be used. The tetrachloroethylene production device can completely convert the chlorine, so that the processes for recovering the chlorine are reduced, and the investment cost and the operating cost are reduced. When the tetrachloroethylene is produced, the operation of lowering the chlorine ratio or increasing the reaction temperature is not required, so that the product yield is high and the byproduct quantity is low.

Description

technical field [0001] The invention relates to a tetrachlorethylene production device and method, in particular to a thermal chlorination tetrachlorethylene production device and method. Background technique [0002] The main process flow of the domestic existing thermal chlorination tetrachlorethylene production plant is as follows: figure 1 Shown: Chlorine is mixed with monochloromethane and then added with diluent (trichloromethane or carbon tetrachloride) to mix, enter the chlorination reactor, and react at a temperature of about 570°C to form tetrachloroethylene and hydrogen chloride. Chlorine reaction, the main components in the outlet gas of the chlorination reactor include tetrachloroethylene, carbon tetrachloride, hexachloroethane, hydrogen chloride and excess chlorine gas; the outlet gas of the chlorination reactor is cooled and condensed in the subsequent process to obtain crude chlorination The crude chlorinated liquid is fractionated in the fractionating towe...

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Problems solved by technology

[0003] Because this process has only one-stage chlorination reactor, and it is an excessive reaction of chlorine gas, the excess chlorine gas in the outlet gas of the chlorination reactor is brought into the subsequent process, and the process route from excess chlorine gas to recovery is too long: first, the requirements for equipment materials are high, The investment cost is high; the second is that the operation is difficult; the third is that the safety risk is large; the fourth is that the device operation cost is high

However, if the chlorine ratio is reduced and the chlorine gas is fully converted, the conversion rate of tetrachlorethylene will be reduced, and the product yield will be reduced; if the reaction temperature is increased and the chlorine gas will be fully converted, the by-product high chloride will increase.

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