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

A polypropylene carbonate and drying technology, which is applied in the chemical industry, sustainable manufacturing/processing, climate sustainability, etc., can solve the problems of no detailed public reports on the process, and solve industrialization problems, production costs and labor costs. The effect of low cost and simple equipment

Active Publication Date: 2009-06-17
INNER MONGOLIA MENG XI HIGH TECH GRP CO LTD
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Problems solved by technology

However, there is no detailed public report on the specific details of the subsequent ce...

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

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Embodiment Construction

[0013] The washing tank is sealed, and the inside is a slurry of polypropylene carbonate desolvated three times with methanol. Use a slurry pump to continuously drive the polypropylene carbonate slurry into the sealed high-level tank, and enter the centrifuge from the high-level tank. The slurry can be continuously entered into the centrifuge for centrifugation, so that the moisture content (weight) of the wet material < 50%; the mesh of the centrifuge filter is 50-300 mesh, and the wet material coming out of the centrifuge enters a horizontal dryer with a vacuum degree of 0-0.08MPa to dry for 1-6 hours, and the mother liquor enters the mother liquor tank; The wet material of the type dryer is dried with a moisture content (weight) < 1%, and the volatile matter is condensed and recovered into the mother liquor tank; the solids with a moisture content (weight) < 1% from the horizontal dryer continue to enter the vacuum Dry in a vertical dryer with a pressure of 0-0.08MPa for 1-...

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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 sealed elevated 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, ...

Claims

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Application Information

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IPC IPC(8): C08G64/40C08G64/34
CPCY02P20/10
Inventor 刘埃林汪英杰张光军陈有业海山李云飞牛丽刚高振勇李成军黄云生徐晓燕
Owner INNER MONGOLIA MENG XI HIGH TECH GRP CO LTD
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