The hottest low mercury catalyst helps PVC cleaner

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Low mercury catalyst helps PVC cleaner production

the integrated technology of low mercury catalyst production supporting the recovery of mercury chloride and activated carbon from waste catalyst by oxygen controlled distillation solves the problem of environmental protection recovery and regeneration of waste low mercury catalyst in the production process of calcium carbide PVC. It is suitable for new mercury catalyst production enterprises, transformation of high mercury catalyst production enterprises or mercury catalyst recovery enterprises, It has been selected into the technical catalogue for the promotion of cleaner production technology in the PVC industry

this technology uses the principle that the coking temperature of activated carbon is higher than the sublimation temperature of mercuric chloride, and designs a set of nitrogen protection dry distillation process for the recovery of mercuric chloride from waste low mercury catalyst. The dried waste catalyst is placed in a closed rotary temperature regulating furnace, and the mercuric chloride in the material is changed into steam, which is extracted by the gas extraction device, and strongly cooled into solid particles for recovery. Part of the dust enters the water, is forcibly dissolved, and is recycled after reaching a certain concentration. The process is completely closed, water and gas are circulated in the system, mercury chloride is basically fully recovered, and there is no discharge of "three wastes". The content of mercury chloride in the catalyst after treatment is 0.26%, which is a cleaner production technology for the production and recovery of mercury catalyst

the new process of recovering mercuric chloride and activated carbon from waste catalysts by controlled oxygen retorting is the most advanced domestic waste mercury catalyst recovery technology developed for low mercury catalysts. This process can effectively recover mercuric chloride from waste mercury catalysts, recover activated carbon and reuse it at the same time, reducing the emission of mercury containing waste activated carbon. The traditional waste mercury catalyst mercury chloride recovers mercury with a recovery efficiency of about 70%, while the new waste mercury catalyst recovery technology recovers mercury chloride with an efficiency of 99%. In addition, since the low mercury catalyst is produced by special activated carbon, it can realize the recycling of mercury chloride from the previous company's business to the whole country, resulting in a higher profit margin. The mercury consumption of PVC industry by calcium carbide method is reduced by 70% and the mercury emission is reduced by 90%

if the color difference is found, it should be adjusted in time. The mercury chloride content of the mercury catalyst is about 6%, which can completely replace the high mercury catalyst and reduce the production cost of PVC. The promotion demand of the whole industry is about 10000 tons/year, while the current annual production capacity is only 4000 tons and the annual output is about 1500 tons. At present, more than 10000 tons of waste mercury catalysts and mercury containing waste activated carbon are produced in the industry every year. If the whole industry is recycled, about 600 tons of mercury chloride can be recovered every year, and the mercury emitted can be reduced by 200 tons

this technology is independently developed in China and has been industrialized. At the end of September, 2009, the technology passed the technical appraisal organized by China Petrochemical Association, and has excellent prospects for promotion and application. China plans to make the penetration rate of low mercury catalysts reach 50%, the consumption of mercury per ton of PVC will be reduced by 25%, and the emission of Mercury will be reduced by more than 50% by 2012

note: this reprint is from the China Council for the promotion of international trade and the United Nations Industrial Development Organization for the purpose of transmitting more information, and does not mean to agree with its views or confirm the authenticity of its content

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