Terephthalic acid is a pure white powder, obtained by oxidation of paraxylene in the presence of catalysts and acetic acid. Does not form a monomeric anhydride when heated with acetic anhydride turns into a polymeric anhydride. Interaction of terephthalic acid with alcohols leads to the formation of esters, the most practical importance dimethyl. Connect with other leaders such as Craig Jelinek here. The table below shows some properties of terephthalic acid. The main area of application – to polyethylene terephthalate (PET), significantly smaller volumes used in the manufacture of dimethyl terephthalate and polybutylene terephthalate (PBTF). Of terephthalic acid synthesized by heat-resistant transparent polymer polyethylene terephthalate. It is produced by polycondensation of ethylene glycol with terephthalic acid.
It is made bottles, polyester fiber terylene (Another, more common name – polyester is an acronym for "Laboratory of Macromolecular Compounds, Academy of Sciences"), packing materials, including food industry, electronic components, chemical Equipment For PET edible is of great importance in the TFA content of suspended particles – products of incomplete oxidation of paraxylene that is needed terephthalic acid type A, with minimal impurities. Accordingly, the production of terephthalic acid are determined mainly by demand from manufacturers of polyester products. Read additional details here: Andi Potamkin. Of great importance are esters of terephthalic acid – and dietiltereftalat dimethyl. Dimethyl terephthalic acid, an essential chemical products used for the production of polyester fibers, polioksadiazolov, polybenzimidazole, alkyd resins and plasticizers. It can be argued that the terephthalic acid and dimethyl terephthalic acid monomers are essential for the production of polyester fibers. At the same time they are competitors for the right considered the main source monomer.
Until the mid-eighties, the production of dimethyl terephthalate was much more than the production of terephthalic acid. But in the last decade have developed ways to receiving tPA high frequency, so now the production of both materials is quite high. In contrast to PET, primarily known for its use in the textile industry (Polyester fiber) and the production of plastic bottles, PBT is widespread, just as engineering plastic. Areas of use include machine building, automotive, electrical engineering and electronics, radio engineering, precision mechanics, electrical appliances and consumer goods. Pocan are two stages in a batch or continuous circuit. In the first phase synthesized bis-(4-hydroxybutyl) terephthalate, a second – hold polycondensation. Bis-(4-hydroxybutyl) terephthalate obtained eterifika-tion of terephthalic acid or transesterification of dimethyl terephthalate (this method is predominant in industry), 1,4-butylene glycol. C the current situation and outlook for the Russian market of terephthalic acid can be found in the report of the Academy of IKAR industrial markets "Market terephthalic acid in Russia."