Process of preparaing methyl acrylate by waste organic glass and apparatus thereof

Abstract

The invention relates to a technique of preparing methyl methacrylate (MMA) by waste organic glass and its device, disclosing a semicontinuous cracking method and an integrated cracking and distilling device. It implements a technique of combining cracking and distilling and the technical courses: crushing the waste organic glass, adding the made glass particles in cracking kettles continuously, orderly and properly, temperature range 140-380 deg.C, as the glass particles reaches a certain quantity, stopping feeding and making final-period cracking and processing, where the average time of cracking and distilling in each a kettle in a cycle (by 1000 kg raw material) is 5-7 hours. On at 140 deg.C can it generate cracked MMA; the MMA product at 140-280 deg.C is dehydrated and becomes a transparent and clear liquid; the MMA purity is 97-99% and the MMA yield is 85-92%.

Description

technical field [0001] The invention relates to recycling of waste and old organic glass, specifically refers to the preparation of methyl methacrylate by using waste and old organic glass as a raw material by adopting a semi-continuous cracking process and an integrated cracking and distillation device. Background technique [0002] The waste generated in the production process of plexiglass, the cutting materials and debris produced in mechanical processing, and the waste plexiglass after use, such as: billboards, lamps, light boxes, handicrafts, decorative plates, mahjong, etc., according to the current incomplete According to statistics, its amount accounts for about 30-40% of the production of plexiglass. With the development of plexiglass application and the increase of waste and old plexiglass, theoretically speaking, the waste and old plexiglass is equivalent to the production volume. Recycling of waste plexiglass, especially pyrolysis, to re-produce monomer methyl ...

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Problems solved by technology

[0005] The purpose of the present invention one is in order to overcome the auxiliary time that batch method exists, and slag discharge is frequent, causes the defect that the production cycle of each kettle is up to nearly 20-30 hours; High requirements, difficult to master the production process, resulting in defects not adopted by manufacturers; at the same time overcome the shortcomings of the separation of cracking and distillation in the above two methods, and large energy consumption

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