Continuous alcoholysis and continuous transesterification recovery method of waste polyester material
A recycling method and polyester material technology, applied in plastic recycling, recycling technology, chemical instruments and methods, etc., can solve problems such as long alcoholysis time, uneven quality, multi-configuration concentration equipment, etc., to avoid side reactions, Short alcoholysis time and stable product quality
Active Publication Date: 2019-11-29
AVANTGARDE SHANGHAI ENVIRONMENTAL TECH CO LTD
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Problems solved by technology
[0005] For this reason, it is necessary to provide a continuous alcoholysis and continuous transesterification recovery method for waste polyester materials, so as to solve the problems of long alcoholysis time and uneven quality caused by intermittent reactions in the background technology, and the quality of alcoholyzed products and transesterified products is not good. Stable, need to configure more enrichment equipment
Method used
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Embodiment 2
[0106] In embodiment 2, only the raw material is changed into waste polyester film, and processed into pieces of 5-10mm×5-10mm, other steps are all the same.
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Abstract
The invention relates to a recovery method of a waste polyester material, particularly to a method for preparing dimethyl terephthalate (DMT) by chemically recovering waste polyester, and belongs to the technical field of waste polyester recycling. According to the method, a process comprising continuous feeding, continuous alcoholysis and continuous transesterification is adopted, such that materials are subjected to homogeneous alcoholysis in a molten state so as to achieve a short required alcoholysis time; more than two alcoholysis kettles are connected in series to carry out continuous alcoholysis, such that the alcoholysis product has stable quality; and the alcoholysis product continuously enters a transesterification kettle, and is subjected to a continuous transesterification reaction, and the EG generated by the transesterification reaction can be recycled in the alcoholysis step, such that the generation of side reactions and the unstable transesterification product qualityare avoided, and the purity and the yield of the waste polyester recovery product are greatly improved.
Description
technical field [0001] The invention relates to a method and device for recycling waste polyester materials, in particular to a method and device for preparing dimethyl terephthalate (DMT) through chemical recovery of waste polyester, belonging to the technical field of waste polyester recycling . Background technique [0002] Polyester (polyethylene terephthalate, PET) is the synthetic fiber material with the largest output, which is widely used in fibers, textile fabrics, clothing, polyester bottles, films, sheets and other products. Based on the enhancement of environmental awareness, resource conservation and sustainability needs, how to deal with the scraps produced in the manufacture of polyester products and the waste of polyester products after use has become an urgent problem to be solved. The recycling of waste polyester has become a green textile development. direction. [0003] At present, the recycling methods of waste polyester mainly include physical recycli...
Claims
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IPC IPC(8): C07C67/03C07C69/82
CPCC07C67/03C07C69/82C08J11/24C08J2367/02C08J11/16Y02W30/62C07C67/30B01J20/20C08J11/22C08J2367/00
Inventor 方华玉朱恩斌李天源陈锦程吴建通陈建华林胜尧王国德
Owner AVANTGARDE SHANGHAI ENVIRONMENTAL TECH CO LTD
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