Comparative Analysis Of PVC Resin Calcium Carbide Method And Ethylene Method.

PVC Introduction to the process of calcium carbide acetylene method：

 

This method involves the direct synthesis of vinyl chloride (VCM) from acetylene and hydrogen chloride in the presence of mercuric chloride catalyst, followed by polymerization to produce polyvinyl chloride. The production process can be divided into acetylene preparation and purification, vinyl chloride synthesis, product refining, and vinyl chloride polymerization. This method has a relatively simple process and equipment, low investment, and high yield; However, due to high energy consumption, high raw material costs, and high toxicity of mercury salts in catalysts, they are constrained by environmental protection and other factors.

 

 

Introduction to the process of Ethylene Oxychloride method:

 

At present, the popular ethylene base pvc oxychlorination process for producing VCM consists of 8 units, namely direct ethylene chlorination, ethylene oxychlorination, dichloroethane (EDC) distillation, EDC cracking, HCl hydrogenation and acetylene removal, VCM refining, wastewater treatment, and incineration. Ethylene chlorination is divided into low-temperature method (50 ℃), medium temperature method (90 ℃), and high-temperature method (120 ℃).

 

 

Advantages and disadvantages：

 

The main advantage of the ethylene oxychlorination method is the use of hydrogen chloride produced by the thermal cracking of dichloroethane as a chlorinating agent, thereby fully utilizing chlorine. Due to the simplicity of the calcium carbide acetylene method and the longer process of the ethylene method, the investment is large. However, the chlorine in the latter can be fully utilized, and the "three wastes" can be treated without discharge.

 

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