Method and system for recycling byproduct hydrogen chloride in aromatic chlorination production process

Method and system for recycling byproduct hydrogen chloride in aromatic chlorination production process

  • CN 105,566,054 A
  • Filed: 12/16/2015
  • Published: 05/11/2016
  • Est. Priority Date: 12/16/2015
  • Status: Active Application
First Claim
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1. an aromatic hydrocarbons chlorination production byproduct in process thing hydrogenchloride circulation utilization method, carry out catalyzed oxidation after it is characterized in that aromatic hydrocarbons chlorination reaction is produced the byproduct hydrogen chloride waste-gas cleaning of chlorinated aromatic hydrocarbons process, the chlorine of oxidation gained is recycled to aromatic hydrocarbons chlorination reaction;

  • Specifically comprise the following steps;

    (1), absorption cleaning;

    byproduct hydrogen chloride waste gas passes in tower from hydrogen chloride purifying tower bottom, with absorption liquid counter current contact in hydrogen chloride purifying tower, by the aromatic hydrocarbon impurities in absorption liquid absorption removing hydrogen chloride gas;

    (2), catalyzed oxidation;

    the hydrogen chloride emission after absorption cleaning and oxygen carry out catalytic oxidation under oxide catalyst effect, make the catalytic oxidation of hydrogen chloride be converted into chlorine;

    (3), freezingly to dewater;

    the mixed gas after hydrogen chloride oxidation reaction passes through the chilled brine heat exchange of-15 ~-25 DEG C, makes the water vapor condensation in gas mixture become the unreacted hydrogenchloride of liquid water, part to be dissolved in liquid water and forms waste hydrochloric acid;

    Freezing dewater after mixed gas directly and fresh chlorine, fresh aromatic hydrocarbons carry out continuous catalysis chlorination production chlorinated aromatic hydrocarbons;

    Hydrogen chloride emission containing aromatic hydrocarbon impurities enters hydrogen chloride purifying tower from hydrogen chloride purifying tower bottom and again carries out absorption cleaning.

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