Factory Supply Phthalic anhydride Powder CAS 85-44-9 Raw Materials

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Phthalic anhydride powder is an important chemical raw material. The most important use of Phthalic anhydride Powder in China is for the production of phthalate plasticizers, followed by the production of alkyd resins and amino resin coatings; Phthalic anhydride Powder can be used in the production of unsaturated polyesters and in the dye industry for the synthesis of anthraquinone.

Phthalic anhydride CAS 85-44-9 is an important organic chemical material, which is a general-purpose anti-coking agent for natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber and nitrile rubber to prevent scorching and improve operational safety. Phthalic anhydride CAS 85-44-9 is particularly effective in thiazole-guanidine and thiazole-kiuram accelerator systems and in rubber materials with alkaline accelerators, but is not suitable for thiuram-free vulcanization systems. Phthalic anhydride is not very polluting, but it has a slight discoloration when white rubber is exposed to light, so it is generally not suitable for white rubber.

Phthalic anhydride Raw Materials are used together with sodium carbonate to increase the foaming effect when used in high promotion sponge products. phthalic anhydride Raw Materials are most used as organic intermediates in the production of plasticizers, coatings and unsaturated polyester resins. phthalic anhydride Raw Materials is also a widely used anhydride-based epoxy resin curing agent. It is inexpensive, cures with little heat, and is particularly suitable for large castings and laminates.

Phthalic anhydride CAS 85-44-9 appearance is white needle crystal, relative density is 1.527, melting point is not less than 131.61℃, boiling point is 295.1℃. Can sublimate. Soluble in acetone, ethanol, slightly soluble in benzene and ether, insoluble in gasoline and water. It is converted into phthalic acid when it meets boiling water or acts with water for a long time. Stable in storage. Flammable. Dust-air mixture is explosive, lower limit of combustion mass concentration 12.6g/cm3. deposited dust is fire hazard. Burning temperature of aerosol is 160°C, spontaneous combustion temperature is 545°C. Toxic, the limit allowable mass concentration is 1mg/m3.

Application/Function of Phthalic anhydride Powder

Phthalic anhydride CAS 85-44-9 is widely used in chemical, pharmaceutical, electronic, agricultural, coating, fine chemical and other industrial sectors. Phthalic anhydride Raw Materials in China are mainly used in the production of phthalic anhydride plasticizers, consuming about 60% of the total consumption of phthalic anhydride, 25% of dyes and paints, and about 15% of unsaturated resins and other products. phthalic anhydride Raw Materials is an important It is mainly used in the production of plastic plasticizers, alkyd resins, dyes, unsaturated resins, and certain pharmaceuticals and pesticides.

Phthalic anhydride Raw Materials are white needle-like crystals with a slight odor. Slightly soluble in hot water and ether, soluble in ethanol, benzene and pyridine.

• Phthalic anhydride powder is one of the important organic chemical materials, used in the production of plasticizers, alkyd resins, unsaturated polyester resins, dyes and pigments, pharmaceuticals and pesticides, etc.
• Phthalic anhydride Powder phthalic anhydride for short, is a fungicide sterilant, insecticide iminothion, herbicide methoprene intermediate.
• Phthalic anhydride CAS 85-44-9 is one of the most important organic chemical materials, its main derivatives are dibutyl phthalate, dioctyl ester and diisobutyl ester, etc. It is used as a plasticizer for PVC, etc. It is also used in the production of unsaturated polyester resin, alkyd resin, dyes and pigments, many kinds of paints, food additives, laxative phenolphthalein in medicine, pesticide 
• Phthalic anhydride CAS 85-44-9 is used as analytical reagent, also used in organic synthesis
• Phthalic anhydride Raw Materials Standard solution for calibrating bases, separating primary alcohols from secondary alcohols and tertiary alcohols. Detects primary amines and aromatic hydrocarbons depending on the solubility point of the formed derivatives. Removal of thiophene from benzene.

Property and Stability of Phthalic anhydride Powder

Phthalic anhydride Raw Materials is white needle crystal in appearance, with relative density of 1.527, melting point of 131.61℃ and boiling point of 295.1℃. Phthalic anhydride Raw Materials is soluble in acetone, ethanol, slightly soluble in benzene and ether, insoluble in gasoline and water. phthalic anhydride powder is converted to phthalic acid when it meets boiling water or acts with water for a long time. Stable in storage. Flammable. Dust-air mixture is explosive, lower limit of combustion mass concentration 12.6g/cm3. deposited dust is fire hazard. Burning temperature of aerosol is 160°C, spontaneous combustion temperature is 545°C. Toxic, the limit allowable mass concentration is 1mg/m3.

Phthalic anhydride powder can be used instead of phthalic acid. It mainly reacts with mono-alcohols to form esters, such as dibutyl phthalate and dioctyl phthalate, which are important plasticizers. Phthalic anhydride CAS 85-44-9 is also used as a raw material for the synthesis of benzoic acid and terephthalic acid, as well as for the synthesis of pharmaceuticals.

Production method of Phthalic anhydride Powder

Phthalic anhydride CAS 85-44-9 is prepared by the catalytic oxidation of naphthalene or o-xylene, and now most of the domestic oxidation of o-xylene has been used, which is described below.
 

1.  Naphthalene oxidation method                                                                                                                                                                                                                                                                                                                                              There are boiling bed and fixed bed method, domestic mainly using boiling bed. The process is: hot air into the boiling bed oxidizer equipped with vanadium catalyst (V2O5) to 300 ~ 340 ℃, the catalyst will be activated for several hours, then the air into the oxidizer, the melted naphthalene sprayed into the oxidizer catalytic layer, the reaction temperature of 360 ~ 380 ℃, the reaction of phthalic anhydride gas produced by the top of the boiling bed filter tube to filter the catalyst, after the condenser multi-stage condensation, and then the exhaust gas through the water spray tower. The exhaust gas is then absorbed by the water spray tower, the hot engine oil is sent to the finned tube of the hot melt condenser, and the phthalic anhydride is melted into liquid and flows into the storage tank that is the crude product, which is treated with concentrated sulfuric acid and neutralized by sodium carbonate respectively, and then refined distilled to get the finished product.
2. o-Xylene oxidation method

          This method is divided into fixed bed method and boiling bed method (fluidized bed method).

• ① fluidized bed method to vanadium a potassium a antimony oxide as the active component, to expand the pore silica as a carrier, made of powder catalyst, oxidation reaction in the fluidized bed, o-xylene and air in the gasifier mixed into the fluidized bed reactor, the reaction temperature of 365 ~ 380 ℃ under.
• ②Fixed-bed method with vanadium pentoxide as the main vanadium catalyst is carried out in a column tube type fixed bed. The filtered dust-free air is compressed, preheated and mixed with the vaporized o-xylene vapor into the reactor, and the oxidation reaction is carried out at 400-460℃ with a feed air speed of 2000-3000h-1 and the concentration of o-xylene in the air of 40-60g/m2, and the reaction heat is brought out by the molten salt circulating outside the tube. Reaction products into the vapor generator, was cooled by further cooling of the reaction gas to recover crude phthalic anhydride, the tail gas by water washing to recover maleic anhydride, crude phthalic anhydride by reduced pressure crude distillation, the top of the tower fractionation of low boiling point maleic anhydride, etc., the material at the bottom of the tower and then vacuum distillation, to obtain finished phthalic anhydride.

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