Waste water zero-discharge acetylene production technology

Abstract

The invention relates to a wet method production technology for preparing acetylene from calcium carbide. Crude acetylene from a generator needs a large volume of sodium hypochlorite solution for cleaning, After the generated waste sodium hypochlorite solution goes through a first desorption tower and acetylene is recovered, part of the solution is used for compounding of a sodium hypochlorite solution, and part of the solution goes through a transition tank and goes into a concentration tank for reuse. Through adjusting of the compounding proportion, all the waste water generated in the technology can be reused without discharge. After a diluted calcium carbide slag slurry overflowed from the generator goes through a second desorption tower and acetylene is recovered, the diluted calcium carbide slag slurry goes into the concentration tank for concentration; the supernatant in the concentration tank is cooled in water cooling tower, a heat exchanger is added in front of an acetylene generator, circulating water cooling is carried out, stable water input temperature and water inflow of the acetylene generator are ensured, and the stability and the controllability of technology production are raised. The provided technology raises the acetylene yield, ensures water balance, achieves waste water zero discharge and has good economic and environmental protection benefits compared with traditional technologies.

Description

Technical field [0001] The present invention involves a wet process for the production of acetylene to produce acetylene. This process realizes the reclaiming process of sodium hypochlorite, so that the wastewater of the process is zero emissions. At the same timeAcetylene device in the production process of polyvinyl chloride. Background technique [0002] Acetylene production process is mainly divided into electrical and ethylene method, and the stone method is divided into dry and wet method.At present, it is commonly used in the country to produce acetracks and wetting techniques.As we all know, the reaction of the electric stones and the water will generate acetylene and release a lot of heat. The reaction equation is shown in the following formula. [0003] CAC 2 +2H 2 O → C 2 H 2 +CA (OH) 2 +129.8kj / mol [0004] Because electrical stones often contain a small amount of impurities such as sulfide, phosphide, and the generated acetylene gas, which contains a small amount of ...

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Problems solved by technology

[0007] The calcium carbide slurry from the acetylene generator not only contains dissolved acetylene, but more importantly, it contains a lot of undecomposed tiny calcium carbide particles. The surface of these calcium carbide particles is "wrapped" by the calcium carbide slurry, resulting in calcium carbide and water. Incomplete response

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