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Method for producing polychloroethylene and hydrochloric acid

A technology of polyvinyl chloride and hydrochloric acid, applied in the preparation of sulfate/bisulfate, chlorine/hydrogen chloride, calcium/strontium/barium sulfate, etc., can solve the problems of restricting the development of PVC, achieve low cost, and solve environmental pollution problems , the effect of less investment

Inactive Publication Date: 2008-06-18
康仁
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AI Technical Summary

Problems solved by technology

After the caustic soda market is saturated and excessive, no more caustic soda plants can be built, which limits the development of PVC

Method used

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  • Method for producing polychloroethylene and hydrochloric acid
  • Method for producing polychloroethylene and hydrochloric acid
  • Method for producing polychloroethylene and hydrochloric acid

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specific Embodiment approach ( 2

[0055] Where conditions are suitable, salt (NaCl) can also be used to produce hydrogen chloride, which can further produce PVC and hydrochloric acid. The process of producing hydrogen chloride is shown in Figure 2.

[0056] As shown in Figure 2, the salt (NaCl) is formulated into a solution of about 25%, and heated to about 90°C. Pour the salt solution into a stirred jacketed reactor heated by steam, gradually add preheated and slightly excessive concentrated sulfuric acid into the reactor, and at the same time turn on the mixer, and keep the reaction temperature at about 90°C.

[0057] After the reaction is completed, the reaction product sodium sulfate is in a supersaturated state, which is sent to the evaporator for further dehydration, and the resulting crystals are centrifuged and air-dried to make Yuanming powder. The centrifuge mother liquor is sent back to the evaporator to continue to evaporate.

[0058] HCl is extracted from the top of the reactor, and the entraine...

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Abstract

The invention discloses a method of producing PVC and hydrochloric acid, adopting technical proposal that: the CaCl2 or NaCl concentrated solutions and the strong sulfuric acid generate reaction under the condition of heating so as to produce corresponding sulfate and release HCl, the released HCl is utilized to produce vinyl chloride and hydrochloric acid. The invention can realize PVC cogeneration of pure soda plant (ammonia-soda process), the waste liquid (containing 10 percent of CaCl2) drained in the pure soda plant is utilized to produce the HCl which is supplied for the PVC plant to produce PVC. The carbide slag drained in PVC plant can be prepared into liming slurry for the use of pure soda plant, the lime kiln gas discharged in the PVC plant is also utilized by the pure soda plant, so that the waste becomes treason, moreover the problem about severe environmental pollution is solved. The invention is very good process route with energy saving and consumption reduction, and also is a representative circulated economical mode.

Description

Technical field: [0001] The invention belongs to the field of chemical industry. Specifically, it is the field of organic chemical industry (polyvinyl chloride) and the field of inorganic chemical industry (hydrochloric acid). Background technique: [0002] Polyvinyl chloride (hereinafter referred to as PVC) is a general-purpose polymer that can be formulated into products with different components. These products have a wide range of excellent physical, chemical, thermal, optical, electrical and other properties. Now PVC is competing with metal, wood, leather, rubber, ceramics, glass, paper, textiles, etc. and has succeeded in partially or mostly replacing them. Therefore, the PVC market is very broad. And the manufacture of PVC must have hydrogen chloride. As the PVC market is tight, so is the market for hydrochloric acid made from hydrogen chloride. [0003] At present, there is basically only one method for producing hydrogen chloride-salt (NaCl) electrolysis. Throu...

Claims

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Application Information

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IPC IPC(8): C01B7/01C08F114/06C01F11/46C01F11/02C01D5/02
Inventor 康仁
Owner 康仁
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