Process for absorbing tail gas in process for preparing chlorocyclohexane by cyclohexane method by high-salt wastewater
A technology for chlorinated cyclohexane and high-salt wastewater, applied in separation methods, chlorine/hydrogen chloride, alkali metal chlorides, etc., can solve the problems of large amount of steam consumption, high treatment cost, strong corrosion and destructiveness of treatment equipment, etc. Achieve the effect of reducing the difficulty of material selection and prolonging the service life
Active Publication Date: 2013-02-13
SHANDONG YANGGU HUATAI CHEM
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Problems solved by technology
Among them, the evaporation method has the best treatment effect, but this method consumes a large amount of steam and the treatment cost is high. In addition, this method is treated at high temperature, and the high-salt high-temperature wastewater is highly destructive to the treatment equipment. Even if it is titanium, Its service life is not more than two years
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Embodiment Construction
[0014] The embodiments of the present invention will be described in detail below.
[0015] Chlorine gas is fed into the reactor containing cyclohexane according to the pressure and speed specified in the process, and the reaction generates chlorocyclohexane and hydrochloric acid gas. Hydrochloric acid gas and a small amount of overflowing chlorine gas are discharged from the reactor through the tail gas discharge port, and are absorbed by the cycle. The tower absorbs at a temperature of 5-10°C and a pressure of -900--1200Pa, and uses high-concentration sodium chloride industrial wastewater instead of clear water as the absorbent. Industrial wastewater containing sodium chloride absorbs hydrochloric acid gas to form salt-containing hydrochloric acid. As the concentration of hydrochloric acid increases, a large amount of sodium chloride will crystallize and precipitate. When the concentration of hydrochloric acid is greater than 30%, put the salt-containing hydrochloric acid sol...
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The invention relates to a process for absorbing tail gas in a process for preparing chlorocyclohexane by a cyclohexane method by high-salt wastewater. The process is characterized in that high-concentration sodium chloride industrial wastewater instead of clean water is used as an absorbent. By the process, the tail gas, namely byproduct hydrochloric acid in the process for preparing the chlorocyclohexane by the cyclohexane method can be absorbed, high-concentration sodium chloride industrial wastewater is treated, byproduct industrial sodium chloride is prepared, material selecting difficulty of equipment for treating the high-concentration sodium chloride industrial wastewater is reduced, and the service life of the equipment is prolonged.
Description
technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to a process for producing chlorinated cyclohexane tail gas by absorbing cyclohexane from high-salt wastewater. Background technique [0002] Chlorocyclohexane is a basic raw material for organic synthesis and an important fine chemical product. It is mainly used in intermediates of rubber anti-scorch agent CTP, pharmaceutical dihemidylated hydrochloride, pesticide tricyclic tin and other products; it can also be used in polyurethane foaming catalyst N, N-dimethylcyclohexylamine, rust inhibitor, etc. synthesis. The preparation methods of chlorocyclohexane include cyclohexene hydrogen chloride addition method, cyclohexane chlorination method and cyclohexanol hydrogen chloride substitution method, etc., wherein the cyclohexane method uses cyclohexane and chlorine as raw materials, and chlorine atoms replace rings. A hydrogen atom on the hexane ring produces chlorocyclohexan...
Claims
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IPC IPC(8): B01D53/78C02F1/58C01D3/04C01B7/01
Inventor 郑崇纳马德龙李宪索夏宇
Owner SHANDONG YANGGU HUATAI CHEM