Phthalic anhydride powder Raw Materials CAS 85-44-9

MF:C8H4O3

MW:148.12

EINECS:201-607-5

Specification:Phthalic anhydride powder

Sample:Phthalic anhydride powder

Brand:Phthalic anhydride powder

Appearance: powder

Storage: Cool Dry Place

Brand: Globalchemical

Shelf Life: 2 Years

Test Method: HPLC

Uses and synthesis of Phthalic anhydride powder

Phthalic anhydride powder, abbreviated as phthalic anhydride, is an important chemical raw material. Phthalic anhydride is mainly used for the production of phthalate plasticisers in China, followed by the production of alkyd resins and amino resin coatings;

Phthalic anhydride CAS 85-44-9 can be used in the production of unsaturated polyester, used in the dye industry for the synthesis of anthraquinone. White needle-like crystals, with a slight odour. Phthalic anhydride Raw Materials slightly soluble in hot water and ether, soluble in ethanol, benzene and pyridine.

Applications / Functions of Phthalic anhydride powder

1. Phthalic anhydride powder is one of the important organic chemical materials, used in the production of plasticisers, alkyd resins, unsaturated polyester resins, dyestuffs and pigments, pharmaceuticals and pesticides, and so on.
2. Phthalic anhydride CAS 85-44-9 is an intermediate for the fungicide Sulfentrazone, the insecticide Imidophos, and the herbicide Methamidophos.
3. Phthalic anhydride Raw Materials is one of the most important organic chemical materials, its main derivatives are dibutyl phthalate, dioctyl phthalate and diisobutyl phthalate, etc., which are used as plasticizers for PVC, etc.; they can also be used in the production of unsaturated polyester resins, alkyd resins, dyestuffs and pigments, many kinds of paints, food additives, laxative phenolphthalein in pharmaceuticals, pesticides and other chemicals. 

Phthalic anhydride CAS 85-44-9 Used as analytical reagent, also used in organic synthesis

Standard solution of alkali calibration, separation of primary alcohols from secondary alcohols, tertiary alcohols. Detect primary amines and aromatic hydrocarbons according to the different solubility points of the formed derivatives. Removes thiophene from benzene.

Physicochemical Property of Phthalic anhydride powder

Appearance is white needle crystal, relative density is 1.527, melting point is not less than 131.61°C, boiling point is 295.1°C. It can sublimate. Phthalic anhydride powder is soluble in acetone, ethanol, slightly soluble in benzene and ether, insoluble in gasoline and water. When encountered with boiling water or long time with the role of water is converted to phthalic acid. Stable in storage. Combustible.

Production methodprocess of Phthalic anhydride powder

Phthalic anhydride oxidation method is divided into fixed bed method and boiling bed method (fluidised bed method).

• ①Fluid bed method to vanadium a potassium an antimony oxide as the active component, with expanded silica gel as the carrier, made of powder catalyst, in the fluid bed oxidation reaction, o-xylene and air in the gasifier mixed into the fluid bed reactor, the reaction temperature of 365 ~ 380 ℃ under the reaction temperature.
• ② Fixed-bed method with vanadium pentoxide-based vanadium catalyst is carried out in a column-tube fixed bed. The filtered dust-free air is compressed, preheated and mixed with gasified o-xylene vapour into the reactor, and the oxidation reaction is carried out at 400～460°C. The feed air velocity is 2000～3000h-1, the concentration of o-xylene in the air is 40～60g/m2, and the heat of the reaction is carried out by the circulating molten salt outside the tube. The reaction product enters the vapour generator, the cooled reaction gas is further cooled to recover the crude phthalic anhydride, the tail gas is washed to recover the maleic anhydride, the crude phthalic anhydride is roughly distilled by decompression, the top of the tower is fractionated to produce the maleic anhydride with a low boiling point and so on, and the material at the bottom of the tower is then distilled under vacuum to obtain Phthalic anhydride CAS 85-44-9 .