1. joint law: oil generated after pyrolysis of vinyl chloride ethylene dichloride, and then cracking under pressure off hydrogen chloride, by-product hydrogen chloride vinyl chloride reacts with acetylene.

2. vinyl-acetylene method: chemical reactions with the legal difference is raw material ethylene and acetylene gas mixture, should be naphtha cracking.

3. acetylene: acetylene reacts with hydrogen chloride vinyl chloride, this high energy consumption, high production costs, low investment, simple technology, higher conversion rates, higher purity.

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