By the method for hydrogen chloride and oxygen production chlorine

By the method for hydrogen chloride and oxygen production chlorine

  • CN 104,192,801 B
  • Filed: 05/10/2007
  • Issued: 12/14/2018
  • Est. Priority Date: 05/18/2006
  • Status: Active Grant
First Claim
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1. a kind of method for aoxidizing production chlorine by the multistage below:

  • A) react hydrogen chloride with the Non-heat activated of oxygen with oxygen thermal response or by hydrogen chloride using catalyst,Wherein react a) in formed admixture of gas, by target product chlorine and water, unreacted hydrogen chloride and oxygen withAnd other submember compositions,B) being cooled makes salt acid condensation, andC) aqueous solution (hydrochloric acid) for the hydrogen chloride to be formed is isolated from admixture of gas, the method is characterized in thatD) hydrochloric acid isolated at least partly is transported to electrochemical oxidation, wherein at least part aqueous hydrochloric acid solution is oxidized to chlorineGas, and wherein the gas-diffusion electrode used as the work of oxygen absorption cathode as cathode,E) chlorine generated in step d) is optionally added in the admixture of gas generated in step c) and in step d)Excessive oxygen is partly used in the reacting of hydrogen chloride and oxygen in step a),F) by removing residual water present in step c) and admixture of gas e) with sulfuric acid scrubbing,G) admixture of gas of the rich chlorine formed is not oxygenous and is optionally free of submember;

    The fraction of stream of the anolyte acid logistics of hydrochloric acid dilution from electrolysis is wherein introduced into the salt absorbed from HClIn acid, wherein being kept completely separate out hydrogen chloride according to step b) and c) from admixture of gas with hydrochloric acid, and according to stepB) and c) separating hydrogen chloride is carried out by adding washing gas mixture with water or dilute hydrochloric acid from admixture of gas.

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