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[Chemical Knowledge]：Production process and preparation method of PTA

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1, an overview
of PTA
for many people, the word PTA may be relatively unfamiliar, then what is PTA? PTA is "terephthalic acid polyester compound" (Polyethylene Terephthalate) abbreviation, it is a widely used plastic material, is the main raw material for making bottles, fibers and packaging film. Due to the wide application of PTA, the production process and preparation method of PTA have been studied in depth.

2, PTA production process

PTA production process mainly includes raw material preparation, reactor reaction, distillation and crystallization.

is the first preparation of raw materials. The raw materials of PTA are mainly p-xylene and carbon dioxide, which need to be reacted at a suitable temperature and pressure to prepare PTA. In the reactor reaction link, it is first necessary to add p-xylene into the reactor, gradually add oxygen into the reactor through an air compressor, so that the reactor maintains a certain pressure, and then add a benzaldehyde catalyst, so that the reaction can be started. As the reaction proceeds, dimethyl carbonate is gradually generated, while formaldehyde is gradually consumed, the product is PTA.

is followed by distillation, which is the process of separating the solvent and impurities of PTA. This link is very important, the use of high temperature and high pressure steam, PTA has become the melt at the bottom of the distillation tower. Next, the PTA at the bottom of the tower is decomposed into two parts by steam pressure reduction in the middle: the parts are sent to the next evaporator to evacuate the gas; The heavy parts are lifted to the head of the tower and condensed and crystallized in the tower drum to become white particles.

is the last part of crystallization, crystallization culture method is one of the main methods of PTA crystallization, it uses the kinetic principle of crystal growth suspension in liquid phase, through the initial crystallization, growth and stable period of continuous crystallization.

3, PTA preparation method

There are two main preparation methods of PTA: petrochemical raw material method and biomass raw material method.

petroleum raw material method is the mainstream production method, mainly using petrochemical engineering technology to convert petrochemical raw materials (such as p-xylene, etc.) into PTA, which has the advantages of mature process, stable process and high product purity. The biomass raw material method is a new method for the preparation of PTA, which is the process of preparing PTA through the process of biological conversion, reactor reaction, distillation and crystallization with biomass as the main raw material. This method has the advantages of good environmental protection and strong resource sustainability, which is the key direction of PTA research in the future.

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