Method for jointly producing sodium carbonate and polyvinyl chloride
A polyvinyl chloride and joint production technology, applied in the chemical industry, can solve pollution and other problems and achieve the effect of reducing energy consumption
Inactive Publication Date: 2010-08-04
康仁
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[0008] Soda ash and polyvinyl chloride use the same main raw materials, because they are independent, resulting in serious pollution
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[0052] 1. Combined production of soda ash and polyvinyl chloride by ammonia-soda method
[0053] 1. Preparation of anhydrous CaCl from soda ash waste liquid 2
[0054] The soda ash waste liquid is clarified, and the clear liquid contains CaCl 2 100g / L, NaCl 45g / L. Send the clarified liquid to the evaporation tank to evaporate to CaCl 2 When the concentration reaches about 40%, NaCl crystallizes out. The NaCl is separated by a centrifuge and sent back to the soda ash plant for use. Continue to evaporate the centrifuged mother liquor, when CaCl 2 When the concentration reaches about 70%, it is sent to the film maker to make flaky calcium chloride dihydrate (CaCl 2 2H 2 O). See figure 2
[0055] Dehydrate the flaky calcium chloride dihydrate at a temperature of 260-300°C to obtain anhydrous calcium chloride. The reaction formula is as follows:
[0056] CaCl 2 2H 2 O=CaCl 2 +2H 2 o
[0057] 2. Use anhydrous CaCl 2 Manufacture of HCl:
[0058] take over Figure...
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The invention discloses a method for jointly producing sodium carbonate and polyvinyl chloride. For sodium carbonate produced by ammonia-soda process, the method comprises the following process flows: producing hydrogen chloride by using calcium chloride anhydrous produced by using a sodium carbonate waste liquid, delivering the hydrogen chloride to a polyvinyl chloride plant to produce the polyvinyl chloride; and delivering waste carbide mud residue of the polyvinyl chloride plant and kiln gas of a limekiln to a sodium carbonate plant for use. Therefore, three waste materials which cause serious environmental pollution are changed into valuable raw materials. For the sodium carbonate produced by joint soda process, the method comprises the following process flow of producing hydrogen chloride by using ammonium chloride produced by the sodium carbonate plant and delivering the hydrogen chloride to the polyvinyl chloride plant to produce the polyvinyl chloride. The polyvinyl chloride plant does not need to build a high-energy-consumption electrolytic caustic soda device. After the sodium carbonate and the polyvinyl chloride are produced by the process, the polyvinyl chloride plant which has one hundred thousand tons of production per year can reduce emission of 2,300 tons of SO and 220 tons of CO every year. When the sodium carbonate is produced by the joint soda process, plants of the sodium carbonate and the polyvinyl chloride can be built in different places, so the problem of hydrogen chloride supply of inland polyvinyl chloride plants which are far away from the sodium carbonate plant can be solved, and also the problem of draggy sale of the ammonium chloride can be solved.
Description
[0001] Technical field: the invention belongs to the field of chemical industry, specifically soda ash and polyvinyl chloride industries. Background technique: [0002] Now, soda ash (including ammonia soda method and combined soda ash method) and polyvinyl chloride belong to two different chemical industries. Soda ash belongs to the inorganic chemical industry, and polyvinyl chloride belongs to the organic chemical industry. Soda ash and polyvinyl chloride are completely independent from the establishment of the factory to the production without any relationship. [0003] Ammonia-soda soda ash is made from salt (NaCl) and limestone (Ca 2 CO 3 ) as the main raw material, a large amount of waste liquid is discharged during the production process. Produce 1 ton of soda ash and discharge 10m of waste liquid 3 , the waste liquid contains calcium chloride (CaCl 2 ) 100g / L, containing salt (NaCl) 43-50g / L. These waste liquids have caused serious environmental pollution, which h...
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IPC IPC(8): C01D7/18C08F14/06
Inventor 康仁
Owner 康仁