Desolution, centrifugation and drying integrated process of poly (propylene carbonate) industrial production

Abstract

The invention relates to the exsolution, centrifugation and drying integrated technology in the industrial production of poly propylene carbonate, which belongs to the technical field of the synthesis of the industrial production of the poly propylene carbonate and the post treatment of the product. The technology comprises: injecting the poly propylene carbonate slurry continuously into a sealedelevated tank by a slurry pump; entering a centrifuge after leaving the elevated tank; putting the slurry continuously into the centrifuge to be centrifugalized to ensure that the moisture content (weight) of the wet material is less than 50 percent; putting the wet material coming out of the centrifuge into a horizontal drier to be dried for 1-6 hours and putting mother liquor into a mother liquor tank; putting the solids with less than 1 percent of moisture content (weight) coming out of the horizontal drier continually into a vertical drier to be dried for 1-4 hours to ensure the moisture content (weight) is less than 0.2 percent after drying; obtaining the ultimate solid which is the finished product of the poly propylene carbonate; and condensing and recovering the fugitive constituents to be led into the mother liquor tank. The technology of the invention has the advantages of complete sealed entire process, complete liquid constituent recovery, continuous technological process,smooth and integrated design, simple equipment and low production and labor cost, which is particularly suitable for industrial production.

Description

technical field [0001] The invention relates to an integrated process of precipitation, centrifugation and drying in the industrial production of polypropylene carbonate, and belongs to the technical field of synthesis of industrial production of polypropylene carbonate and post-treatment of products. Background technique [0002] Polypropylene carbonate, a polymer of carbon dioxide and propylene oxide, has properties close to ordinary plastics, and has complete biodegradability, which can replace ordinary plastics; at the same time, this process can effectively use carbon dioxide and reduce greenhouse gas emissions, so it realizes its industrial production It is the dream of entrepreneurs and chemical experts in recent years. Mengxi Group took the lead in realizing the industrialized production of carbon dioxide and propylene oxide polymerization in 2002. [0003] The polymerization reaction of carbon dioxide and propylene oxide is bulk polymerization. After the reaction, ...

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Problems solved by technology

However, there is no detailed public report on the specific details of the subsequent centrifugation and drying and the integrated process of precipitation, centrifugation and drying.

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