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Terephthalic Acid

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  • Terephthalic acid is a carboxylic acid. Terephthalic acid donates hydrogen ions if a base is present to accept them. This "neutralization" generates substantial amounts of heat and produces water plus a salt.
  • Terephthalic acid is a sand-like white powder. It is used as a reagent to neutralize alkali in wool, as an additive to poultry feeds, and to increase the effectiveness of certain antibiotics.
  • PTA is used to manufacture light-coloured adhesives to bond metal, wood, paper and synthetics. Specific uses for these high-strength, solvent-free adhesives include shoe fabrication, lamination and automotive sub-assembly.
  • Purified Terephthalic Acid (PTA) is used in the industrial fiber industry as one of the raw materials to make polyethylene terephthalate, more  commonly known as polyester.
  • End products produced from PTA include polyester fabrics, recording tapes, tire cord, food packaging, and soft drink bottles.
  • Terephthalic acid is a key raw material for polyester production and ranks 25 th in tonnage of all chemicals produced in the world.
  • Terephthalic acid (TPA) is made by air oxidation of p-xylene and requires purification for use in polyester fiber manufacture.
  • PTA is made by causing a reaction between the secondary petroleum product paraxylene (PX) and acetic acid.
  • Terephthalic acid (TA), one of the largest volume commodity chemicals, is commercially manufactured, by dioxygen oxidation of para-xylene (PX), in a homogeneous acetic acid (HOAc) medium, using a catalyst combination of cobalt and manganese salts and bromide ion promoter .
  • Terephthalic acid (TA), one of the largest volume commodity chemicals, is commercially manufactured, by dioxygen oxidation of para-xylene (PX), in a homogeneous acetic acid (HOAc) medium, using a catalyst combination of cobalt and manganese salts and bromide ion promoter.
  • The oxidation of para-xylene to crude terephthalic acid (CTA) catalyzed by metals and bromide is accomplished in acetic acid. The CTA is then purified to obtain purified terephthalic acid (PTA).
  • More than 60% of the DMT/TPA produced in the world is used to manufacture PET polymer for polyester fibers. Another 31% goes into the manufacture of PET solid-state resin for bottles and other packaging applications.
  • China is by far the largest TPA producer in the world and accounted for a share of about 28% in 2009. Other major producers are the Republic of Korea, Taiwan and Thailand. The latter three export about half of the TPA produced, accounting for nearly 80% of the global trade, with the rest consumed in PET solid-state applications.
  • Nearly all purified terephthalic acid (PTA) is consumed in polyester production including polyester fibre, polyethylene terephthalate (PET) bottle
    resin and polyester film. For most grades of polyester used in textiles and food and beverage containers, it is more economical to use PTA than the alternative dimethyl terephthalate (DMT) intermediate.
  • The remaining PTA is used in making cyclohexanedimethanol, terephthaloyl chloride, copolyester-ether elastomers, plasticisers and liquid crystal
    polymers.
  • A major challenge facing the PTA industry is the growing overcapacity caused by huge capacity additions of nearly 9m tonne/year under development, mainly in China. Up to three PTA units could be started up in China by mid-2009 although two of these could face delays.

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