Phthalic anhydride, anhydride phtalique, Anhydrid kyseliny ftalove, AKOS BBS-00004337, 85-44-9

Phthalic anhydride, anhydride phtalique, Anhydrid kyseliny ftalove, AKOS BBS-00004337, 85-44-9

Phthalic anhydride

CAS: 85-44-9

Molecular Formula: C8H4O3

Names and Identifiers

Physico-chemical Properties

Risk and Safety

Hazard Symbols	Xn - Harmful
Risk Codes	R22 - Harmful if swallowed R37/38 - Irritating to respiratory system and skin. R41 - Risk of serious damage to eyes R42/43 - May cause sensitization by inhalation and skin contact.
Safety Description	S23 - Do not breathe vapour. S24/25 - Avoid contact with skin and eyes. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection S46 - If swallowed, seek medical advice immediately and show this container or label. S22 - Do not breathe dust.
UN IDs	2214
WGK Germany	1
RTECS	TI3150000
FLUKA BRAND F CODES	10-21
TSCA	Yes
HS Code	29173500
Hazard Class	8
Packing Group	III
Toxicity	LD50 orally in Rabbit: 1530 mg/kg LD50 dermal Rabbit > 3160 mg/kg

Upstream Downstream Industry

Nature

White needle-like crystals, flammable, sublimate below the boiling point, with a slight odor. The relative density was 1. 527. Melting point 131.6 °c. Boiling point 295 °c (sublimation). Flash point (Open Cup) 151.7 °c. Ignition point: 584 ℃. Slightly soluble in hot water and ether, soluble in ethanol, benzene and pyridine.

Preparation Method

1. catalytic oxidation of naphthalene after fusion gasification of naphthalene and air in a fluidized bed or fixed bed reactor, in the presence of vanadium pentoxide catalyst, catalytic oxidation to generate phthalic anhydride gas, the crude anhydride is obtained by condensation and hot melting, and purified phthalic anhydride is obtained by distillation, condensation and separation under reduced pressure after heat treatment.
2. O-xylene oxidation using O-xylene as raw material, gas phase oxidation with air in the presence of a catalyst such as vanadium pentoxide in a fixed-bed reactor to phthalic anhydride is obtained by refining.

Use

One of the important organic chemical raw materials. It can be used as an intermediate of organic compounds such as plasticizer, alkyd resin, unsaturated polyester resin, dye and pigment, medicine, food additive and pesticide.

Safety

• this product and benzoic acid on the skin, mucous membranes have local irritation, sometimes cause severe inflammation and blisters, and there are many forms of difficult to cure ulcers, its toxicity is slightly smaller than benzoic acid, oral LD508.Og/kg for rats. The maximum allowable concentration in air is 2 × 10-6. In the production, the concentration of phthalic anhydride in the air of the workshop can be reduced by spraying and trapping water, and the operator should wear the labor protection equipment.
• The Flake phthalic anhydride is packed in a woven bag lined with a plastic bag or a multi-layer moisture-proof Kraft paper bag. The liquid phthalic anhydride shall be shipped in an insulated tank truck. Stored in a dry, ventilated, light-protected, fire-free environment, temperature below 40 ℃, shelf life of three months. During transport, the packaging should be kept intact, moisture-proof, fire-proof, etc.

Research Progress of Catalysts for Phthalic Anhydride Synthesis

Summary:

Introduces the basic catalysts for the catalytic oxidation of naphthalene, o-xylene, and n-pentane to synthesize phthalic anhydride, such as catalysts based on V2O5, molybdenum oxide catalysts, V2O5-TiO2-K2SO4 catalysts and VPO catalysts, and expounds the adjacent synthesis of phthalic anhydride The role of each component of the catalyst, proposed that the development of a new type of catalyst should implement a new idea of the three-party joint development of catalyst research, expand ideas to replace imported catalysts with domestic catalysts as soon as possible.

Progress in Phthalic Anhydride Production Technology

Summary:

Several technologies for the production of phthalic anhydride through the o-xylene process route are introduced, including the traditional single fixed bed oxidation reactor, the developed double fixed bed reactor, the recovery of phthalic anhydride using maleic anhydride as a liquid eutectic mixture, and a fluidized bed reactor based on an improved wear-resistant catalyst. The economics of production technology are discussed, and the catalyst technology, process research and development and its industrial status are reviewed.

Introduction

Phthalic anhydride, chemical formula C6H5COR (where R represents alkyl, aryl, etc.), is an important organic compound. The following is a description of the nature, use, formulation and safety information of the Phthalic anhydride:

Nature:
1. Appearance: Phthalic anhydride is a colorless or yellow liquid.
2. Odor: a pungent aroma.
3. Density: Phthalic anhydride has a high density, usually between 1.1-1.2g/cm³.
4. Boiling point: The boiling point of Phthalic anhydride is higher, usually between 200-230 ℃.
5. Solubility: Phthalic anhydride is soluble in many organic solvents, such as ethanol, ether and benzene.

Use:
1. Industry: Phthalic anhydride is an important organic compound, which is widely used as an intermediate and solvent in industries such as dyes, pharmaceuticals, coatings and plastics.
2. Medicine: Phthalic anhydride is used in the pharmaceutical industry to synthesize various drugs, such as antibiotics, analgesics and anti-cancer drugs.
3. Pesticide: Phthalic anhydride is also used in the manufacture of pesticides for the prevention and control of pests.

Preparation Method:
Phthalic anhydride can be prepared in a variety of ways, including:
1. Air oxidation method: Phthalic anhydride can be prepared by reacting benzene with oxygen under the action of a catalyst.
2. Oxidation method of side-chain alkylbenzene: Oxidation of side-chain alkylbenzene with oxygen under the action of a catalyst to the corresponding Phthalic anhydride.
3. Aromatic carboxylic acid ester hydrolysis method: aromatic carboxylic acid ester and water under acidic conditions to generate Phthalic anhydride.

Safety Information:
1. Phthalic anhydride is a flammable liquid and should be avoided in contact with open flames or high temperature sources.
2. Use should wear appropriate personal protective equipment, such as chemical protective gloves and goggles.
3. If the Phthalic anhydride leaks, it should be cleaned with appropriate adsorption materials and protective equipment.
4. Avoid contacting the Phthalic anhydride with skin, eyes and respiratory tract. If contact is accidental, please rinse with plenty of water immediately and seek medical assistance.
5. When using and storing Phthalic anhydride, it is necessary to comply with relevant safety operation regulations and regulations, and properly dispose of waste.

Please note that the information mentioned above is for reference only, and the specific operation and application need to be carried out according to the actual situation and relevant safety regulations.