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p-Phthalic acid (p-Phthalic acid)

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p-Phthalic acid

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TEREPHTHALIC ACID FOR SYNTHESIS
benzene-1,4-dicarboxylic acid
p-Phthalic acid
Terephthalic acid
Terephthalic Acid
Terephthalicacid
Caffeic acid
TEREPHTHALIC ACID (TPA)
TEREPHTHALIC ACID/BENZENE-1,4-DICARBOXYLIC ACID
p-Phthalic Acid
PURIFIED TEREPHTHALIC ACID
1,4-Benzenedicarboxylic acid
Benzene-1,4-dicarboxylic Acid
P-BENZENEDICARBOXYLIC ACID

+Expand -Stow

100-21-0

C8H6O4

166.131

2917361100

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Nature Description

White needle crystal or powder. The relative density is 1.510g/cm3, soluble in alkali solution, slightly soluble in hot ethanol, insoluble in water, ether, glacial acetic acid and chloroform.

Product Applications

It is an important raw material for manufacturing polyester resin, film, fiber, insulating paint and engineering plastics.

Production method

1. The most widely used and economical production method in industry is high-temperature liquid phase oxidation with p-xylene as raw material. Other production methods of terephthalic acid include low-temperature oxidation of p-xylene, phthalic anhydride transposition method, Toluene oxidation disproportionation method, etc. 1. High-temperature oxidation of p-xylylene p-dimethylbenzene using acetic acid as solvent, cobalt acetate-manganese acetate as catalyst, using tetrabromoethane as cocatalyst, oxidation at 221-225 ℃,2.5-3.0MPa to produce terephthalic acid. Terephthalic acid has little solubility in acetic acid, and the oxidation product is mud-like. After centrifugal separation and drying, crude terephthalic acid is obtained. Among them, the most harmful impurity is p-carboxyl benzaldehyde with a content of 1000-5000ppm. The crude product is dissolved in water at 280-290 ℃ and about 7MPa pressure, and then hydrotreated in the presence of catalyst to remove P-carboxylic benzoic acid. After crystallization, filtration, washing and drying, fiber grade terephthalic acid is obtained. 2. Low-temperature oxidation raw material of p-xylene in acetic acid solvent, cobalt acetate (or manganese acetate) and bromide are used as catalysts, triacetaldehyde is used as oxidation promoter, and under the temperature of 100-130 ℃ and pressure of 3MPa, one step low-temperature oxidation with air, the reaction product is washed with acetic acid, and then the product is dried to terephthalic acid.

100-21-0 preparation

2. It can be obtained by oxidation of p-xylene or rehydrolysis of p-xylene to terephthalic nitrile by ammonia oxidation.

Security

Dangerous Goods Marking： Xi

Safety instructions： S24/25: prevent contact between skin and eyes.

Storage conditions： Store in a cool and ventilated warehouse. Keep away from fire and heat source. It should be stored separately with oxidant and alkali, and should not be mixed. Equipped with corresponding varieties and quantities of fire fighting equipment. The storage area should be equipped with appropriate materials to accommodate leaks. Packed with plastic bag coat cloth bag or polypropylene woven bag, each bag is 20kg. Store in a cool, ventilated and dry place. Heat-proof, sun-proof and moisture-proof. Storage and Transportation according to general combustible chemicals regulations.

Hazard Statement： R36/37/38