After refining hydrogen chloride gas due to a small amount of impurity (especially organic matter), so it is widely used, the following simple description of its use.

● Production of hydrochloric acid

     The refined HCl gas (in packed or membrane absorber) can be absorbed with water to produce industrial-grade hydrochloric acid, which is the method adopted by most enterprises. The hydrochloric acid can be used in metal cleaning, oil well acidification, hydrometallurgy (such as dealing with clay, kaolin or carbonaceous shale producing alumina, instead of sulfuric acid processing titanium iron ore production of titanium dioxide, such as noble metal chloride hydrometallurgy production), instead of sulfuric acid to react with sodium chlorate production of chlorine dioxide, phosphate acid phosphate fertilizer production, the manufacture of inorganic matter (such as

     The nanpo Coal Mine Bureau of Liaoning Province uses hydrochloric acid to treat coal gangue to produce crystalline aluminum chloride and polyaluminum chloride water treatment agent. The crystalline aluminum chloride and polyaluminum chloride are respectively 10,000 t/a, 50,000 T/A consumed by industrial hydrochloric acid, and organic synthesis (such as aromatic acid esterification). In addition, the hydrochloric acid produced can be heated, desorbed, condensed, filtered and adsorbed to obtain high yield and high purity hydrogen chloride, making it more widely used.

● High purity HCl gas production

     High purity HCl gas can be produced by absorption - desorption - condensation - filtration - adsorption process. The uses of this high purity hydrogen chloride gas are as follows:

● PVC production

     High purity HCl gas can be used to synthesize chloroethylene with ethylene, and can also be used to produce chlorinated hydrocarbon by catalytic oxychlorination reaction with hydrocarbon, air (or oxygen). The most important oxychlorination reaction in industry is the production of dichloroethane. The resulting dichloroethane is cracked to make vinyl chloride and produces HCl gas as a by-product, which can be recycled.

● NH4Cl production

     Ammonia and HCl can be directly synthesized to produce NH 4 Cl, and phosphorus chloride can also be used as an intermediate of 4-hydroxymethyl phosphorus chloride.

● Metal chloride production

     Silicon tetrachloride can be prepared by the reaction of silicon carbon and hydrogen chloride in the presence of phosgene and NiCl 2 at a temperature of 700 ℃. The chlorides of Mo, Nb, Ta, Ti, Zr, Hf, Cr, W and other metals can also be prepared by the corresponding reaction of metal nitride and hydrogen chloride.

● Chlorinated hydrocarbon production

     Hydrogen chloride can be produced by addition reaction with alkenes and alkanes. For example, at 35 ~ 40 ℃, hydrogen chloride and ethane are reacted in the liquid phase to produce chloroethane. The industrial production of 1, 1-dichloroethane and 1,1, 1-trichloroethane is produced from chloroethane and hydrogen chloride.

● Organic synthesis

      In the synthesis of organic matter, hydrogen chloride can be used directly as a chlorination agent, for example, various alkyl chlorides can be prepared by chlorinating corresponding alcohols with hydrogen chloride.

● Other applications

     Hcl-h2 mixture can be used for heavy oil desulfurization. High temperature dissociation of HCl has been applied to chemical plasma reactions, through which various chlorocarbons and chlorinated hydrocarbons of C 1 and C 2 can be synthesized from carbon and hydrogen chloride.