Discussion on the dehydration issue of acetylene and HCl in VCM production via the acetylene method!
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The production of PVC using the acetylene method is quite common in our country. . Regarding the dehydration issue in the vinyl chloride (VCM) production plant, I believe it is necessary to make improvements, as poor dehydration leads to the remaining water reacting with HCl to form hydrochloric acid, which corrodes the equipment. As a result, the equipment often has to be shut down for cleaning and maintenance, thereby increasing the production cycle and costs. At present, most manufacturers first mix acetylene with HCl and then carry out condensation to remove water; after dehydration, the water content is generally between 0.03% and 0.06%. In my opinion, it would be entirely feasible to first condense acetylene and HCl separately before mixing them together and feeding them into the reactor. I did the calculations, and the dehydration effect is much better than before, reaching 0.001%. If any of you are interested in this, let’s discuss it with me.
I agree with the original poster’s view, but there are also issues. HCl gas can be dehydrated using freezing, achieving a water content of 2 ppm. But what about acetylene? If caustic soda is used, the cost is high and there are many waste by-products. On the forum, there are methods that use concentrated sulfuric acid for dehydration, but C is formed in the actual production process. I have also conducted research on the dehydration issue in the vinyl chloride production section using the acetylene method. I think the mixers also need improvement; the poor mixing quality of traditional mixers plays a significant role in this as well.
Keeping the water content in the water entering the reactor below 0.03% ensures that the equipment is largely unaffected by corrosion during operation. Won’t undressing it too much instead affect operating costs and equipment costs?