A new choice for PVC companies
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This post was last edited by fmch6605 on 2012-12-31 12:39 Currently, the domestic production of vinylidene chloride is based on the calcium carbide VCM method that has been eliminated from abroad. It has high costs, many side reactions, and serious pollution. If the EDC method is used, in addition to absolute advantages in cost and investment, it also has the advantages of good quality and less pollution. The northwest calcium carbide method has a huge PVC production capacity and produces a large amount of EDC as a by-product. The export price is low. It can be used as a raw material for VDC after simple processing, and can then derive a series of polymer products. It is also a good product for balancing chlorine. It has a very broad market prospect and considerable economic benefits. Welcome to discuss it together.
The poster has some ideas. I know very little about vinylidene chloride. I hope you can educate me on it. Thank you.
Can the calcium carbide method produce EDC by-product? I really don’t know. Isn’t EDC coming from ethylene?
This post was finally edited by fmch6605 on 2013-1-6 21:15. Asked such a question? Fortunately, you are from a calcium carbide PVC company. Who is your teacher? :lol
I really don’t have a teacher, so you don’t need to be so anxious. I only know about EDC production, and it seems that they all use vinyl. I have never heard of using calcium carbide, and you can find it on Baidu. . . . . .
VDC has many uses, but its usage is not large. There is no polymerization production technology for high-end materials in China, so Juhua’s PVDC sells for more than 30,000, and DOW’s sells for more than 100,000.
When you say EDC, do you mean the by-product of vinyl chloride distillation?
This post was last edited by fmch6605 on 2013-1-10 11:55 Yes, generally acetylene plus hydrogen chloride to produce VCM will produce 2~3% EDC as a by-product. At present, domestic PVC factories sell it at low prices to surrounding small chemical industries and make crude solvents for take-out. It is a waste.
The stability of the supply is a problem. In addition, the content of dichloroethane shipped from different manufacturers is different, which is difficult to operate. Another thing is that the northwest has a large output, but there is not much dichloroethane to resume production. I think the 2%-5% data you mentioned above is inaccurate.
The content of high-boiling substances in crude vinyl chloride is generally 0.1% to 0.5% (mass fraction), and the content of 1,1-dichloroethane in high-boiling substances is generally 20% to 50%. Factories generally use batch distillation to recover vinyl chloride monomer and dichloroethane, and dichloroethane is generally used as a solvent. I know quite a bit about the EDC process for producing vinyl chloride that the poster mentioned, but I don’t know much about the production of vinylidene chloride. I personally agree with some of the limiting factors mentioned by Buzhu. I hope that the poster can explain your method in detail, so that everyone can share it! Furthermore, Bamboo should show up more and increase the popularity of the PVC area! :victory: