Is it still reasonable for the chlor-alkali industry to support PVC production?
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Many chlor-alkali industries require PVC production equipment as supporting equipment. With the development of technology, will there be better technology to deal with the excess Cl2? Is it necessary to support PVC?
It is not necessary. You can use chlorine gas to produce chlorinated paraffins and pesticides (Taian, Shandong Province). Generally, the equipment is less than 50,000 tons. If it is larger, PVC is a better choice, or vinylidene chloride (which is a bit difficult). The amount of inorganic chemicals is very small, and there is gas phase silica. . . Seems a bit more difficult
There are many chlorine products. We currently have chloroacetic acid and trichlorosilane. However, due to limitations of equipment scale, production capacity, and downstream markets, we mainly rely on polyvinyl chloride to consume chlorine gas. I heard that the 300,000 tons of caustic soda in Feng County, Xuzhou is not going to be matched with polyvinyl chloride. The specific situation is not clear yet. Some friends who know about it can tell me. This post was finally written by wang * neng edited at 2009-3-18 08:30 ]
The supporting products need to have sales volume. PVC is used in large quantities, and many chlorine-consuming products have little demand. Can’t scale!
Xuzhou Fengxian’s is 300,000 tons of caustic soda and 300,000 tons of PVC. Our company's new chloroacetic acid is used to consume chlorine gas, and the market is very good.
This is what I did for my graduation project. I calculated the 100,000-ton PVC synthesis workshop. Isn’t 100,000 tons very small now?~~~
As far as chlorine-consuming products are concerned, PVC should be an absolute chlorine-consuming product. In addition, PVC’s wide application and economic applicability have not been replaced by other products so far. Therefore, I personally think that PVC is still inevitable for the chlor-alkali industry, at least it cannot be changed for a long period of time.
According to the current PVC industry access rules, a scale of at least 300,000 tons/year is allowed to be launched.
* * The National Development and Reform Commission, together with relevant departments, formulated the "Chlor-Alkali (Caustic Soda, Polyvinyl Chloride) Access Conditions" (hereinafter referred to as the "Access Conditions"), which regulates the future development of the chlor-alkali industry from five aspects: industrial layout, scale and technology, energy consumption, safety and environmental protection, and supervision and management. Review: The "Access Conditions" mainly cover the following points:: 1. New chlor-alkali projects should comprehensively consider resources and operating advantages, and must be far away from areas with higher environmental and safety requirements. Especially in the eastern region, in principle, there will be no new calcium carbide chlor-alkali projects. 2. Except for special reasons (relocation of old enterprises, etc.), the production scale of new or expanded caustic soda and polyvinyl chloride projects cannot be less than 300,000 tons/year, and projects using calcium carbide process must simultaneously build calcium carbide slag cement-making and other comprehensive utilization devices. The production scale of a single set must reach 2,000 tons/day (newly built) and 1,000 tons/day (existing) respectively. Encourage enterprises to adopt advanced production processes such as ethylene oxychlorination, dry ethylene production, and mercury-free catalysts. 3. Set maximum limits for energy and resource consumption of existing and newly built chlor-alkali projects, encourage the development of combined heat and power, direct purchase of electricity, etc., promote the concept of circular economy, and improve energy utilization. 4. Industry associations and functional departments at provincial level and above will strictly control new construction, renovation and expansion of chlor-alkali projects.
Due to blind expansion in recent years, domestic PVC production capacity is now oversaturated.* * Policy adjustments have caused calcium carbide prices to remain high, and the profit margins of calcium carbide PVC production have been greatly squeezed. Some manufacturers in the eastern coastal areas have been losing money and are struggling to survive. Some have completely stopped production. It is no longer a good choice for chlor-alkali projects to support PVC to consume chlorine.