Method for preparing polyethylene glycol terephthalate by adopting anchoring agent

Abstract

The invention relates to a method for preparing chemical, in particular to a method for preparing polyethylene glycol terephthalate by adopting anchoring agent. The method is as follows by the technical scheme provided by the invention: orthobenzene dicarboxylic acid and glycol which are taken as basic materials are prepared to be sizing agent at the mole ratio of 1:1-2.5 and the sizing agent is put in a reaction kettle for esterification reaction by a sizing agent pump to generate oligopolymer; the oligopolymer after the esterification reaction is injected in a prepolycondensate reaction kettle by a pump through an oligopolymer pipeline and additive is added to the oligopolymer pipeline simultaneously by a metering pump; and the generated product enters a final polycondensation reaction kettle with the temperature of 285-295 DEG C, the vacuum degree smaller than or equal to 1mm Hg for polycondensation reaction of 0.5-5 hour so as to form the polyethylene glycol terephthalate. The invention can shorten the polycondensation reaction time and SSP time.

Description

technical field [0001] The invention relates to a method for producing chemical products, in particular to a method for preparing polyethylene terephthalate with a tackifier. Background technique [0002] Polyethylene terephthalate (referred to as polyester, polyethylene terephthalate, PET) has excellent physical and chemical properties and a wide range of uses, and is now used in polyester fiber, food bottles, daily necessities bottle packaging (such as wine, beverage , edible oil, condiments, medicines, daily cosmetics, films, films, engineering plastics, etc.) have been applied. It has become the polyester product with the largest output and the most varieties, constantly replacing other plastics and fibers. The polyester industry has always been the focus of the development of my country's chemical fiber industry, with an annual growth rate of more than 10%. At present, the output of polyester in the world is 32.5 million tons, and the output of polyester in my country ...

AI Technical Summary

Problems solved by technology

At present, the international advanced PTA method has become the main production process and development direction. The world's major polyester manufacturers are very representative: DuPont of the United States, ZIMMER of Germany, INVENTA of Switzerland, and Bell Spinning of Japan. However, the difference is that the United States DuPont adopts three-pot process (esterification kettle, pre-condensation kettle, final polycondensation kettle) technology, while other technologies are five-pot process (first esterification kettle, second esterification kettle, pre-condensation kettle, polycondensation kettle, final polycondensation kettle) kettle), however, no matter which way, there is a shortage of high energy consumption. According to industrialization data, the energy consumption required for the polycondensation process in the three-pot process accounts for about 50% to 60% of the energy consumption of the product, and the SSP consumption Energy accounts for about 30% to 40% of the energy consumption of products, and has become a key problem to be solved for the high energy consumption of polyester in the world today.

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