[Chemical Knowledge]：The nature, use, upstream and downstream raw materials, storage methods, resorcinol Baidu Encyclopedia.

Properties of isophthalonitrile

Two benzene two nitrile (English name: Isophthalonitrile, referred to as IPN), chemical formula C8H4N2, is a kind of aromatic compounds with two cyano substituents. Its physical properties appear as a white crystalline solid with a melting point between 99-101°C and a boiling point of about 265°C. Isophthalonitrile is insoluble in water, but soluble in most organic solvents, such as ethanol, ether, benzene and so on. It has certain toxicity and irritation, and may cause harm to the human body when it is in contact with the skin or inhaled, so it is necessary to pay attention to protective measures when using and handling.

Chemical Properties of Isophthalonitrile

Isophthalonitrile has high reactivity due to the presence of two cyano groups (-CN) in the molecule. Under appropriate reaction conditions, cyano can undergo hydrolysis, reduction, substitution and other reactions to generate a series of organic compounds. For example, isophthalic acid can be generated by the hydrolysis reaction of the cyano group; in the presence of a catalyst, the cyano group can be reduced to an amine group, thereby generating m-phenylenediamine. Isophthalonitrile can also be used as an intermediate in organic synthesis to generate other functional materials through various chemical reactions.

The main use of benzene two nitrile

Isophthalonitrile is widely used in a variety of fields, including the following aspects:

1. High-performance resins: Isophthalonitrile is an important raw material for the production of high-performance engineering plastics and resins, especially in the synthesis of polyamides and polyesters. These materials usually have excellent mechanical properties, chemical resistance and heat resistance, and are widely used in the electronic, electrical and automotive industries.

2. Pharmaceuticals and pesticides: As an organic synthesis intermediate, isophthalonitrile can be used to synthesize a variety of drugs and pesticides. For example, some antibacterial drugs and herbicides contain a isophthalonitrile group in the molecular structure, and through its structural modification, compounds with specific pharmacological activities can be obtained.

3. Dyes and Pigments: Isophthalonitrile and its derivatives are also used in the production of dyes and pigments. These compounds can provide bright colors and have good light and weather resistance in textiles, plastics and coatings.

Upstream feed

The production of isophthalonitrile usually starts with m-xylene (m-Xylene). M-xylene is oxidized by catalytic reaction to produce isophthalic acid (Isophthalic acid), and then in the presence of dehydrating agent, isophthalic acid is further dehydrated to produce isophthalonitrile. The production process also involves the use of hydrocyanic acid (HCN) as a source for supplying the cyano group (-CN). The optimization and improvement of the production process, especially in the selection of catalysts and reaction conditions, is of great significance to improve the yield and purity of isophthalonitrile.

Isophthalonitrile Downstream Products

As an important organic chemical intermediate, there are many downstream products, including:

1. Polyamide (nylon): isophthalonitrile can be synthesized into nylon resin, which has excellent wear resistance and mechanical properties, and is widely used in the fields of fiber, plastic and engineering materials.

2. Isophthaloyl chloride: isophthaloyl chloride can be generated by the chlorination reaction of isophthaloyl chloride, which is an important raw material for the synthesis of polyester, polyamide and polyimide.

3. Pharmaceutical intermediates: isophthalonitrile can be derived from a variety of biologically active compounds through chemical reactions, which are used in the synthesis of anticancer drugs, antibacterial drugs and antiviral drugs.

Production process of isophthalonitrile

The industrial production of isophthalonitrile mainly uses two steps: catalytic oxidation and dehydration reaction. m-xylene is oxidized to isophthalic acid under high temperature and high pressure by the action of metal cobalt or manganese salt catalyst. Next, in the presence of a dehydrating agent such as phosphoric acid, isophthalic acid is subjected to a dehydration reaction to produce isophthalonitrile. In this process, controlling the reaction conditions such as temperature, pressure and catalyst dosage plays an important role in improving the yield and product purity.

Storing method of isophthalonitrile

Because isophthalonitrile has a certain toxicity and irritation, and easy to volatilize, it is necessary to take appropriate protective measures during storage. Isophthalonitrile should be stored in a cool, ventilated and dry warehouse, away from fire and heat sources to prevent its volatilization and decomposition. The isophthalonitrile should be stored in a sealed container to avoid long-term contact with air. During storage, the tightness of the container should also be checked regularly to prevent leakage. During operation and handling, workers should wear appropriate protective equipment, such as gloves, masks and protective clothing, to prevent contact and inhalation.

Isophthalonitrile Safety and Environmental Protection

Isophthalonitrile has certain hazards to the human body and the environment, so in the process of production and use, safety and environmental protection regulations must be strictly observed. Avoid skin contact and inhalation of its vapors when handling isophthalonitrile, and wear protective equipment when necessary. The waste gas, waste water and waste residue generated in the production process should be treated and discharged after reaching the standard to avoid pollution to the environment. In particular, the treatment of cyanide requires the use of professional wastewater treatment technology to ensure that it does not cause harm to the ecosystem.

Summary

As an important chemical raw material, because of its unique chemical properties and wide application prospects, it has an important position in the fields of high-performance resin, medicine, pesticide, dye and so on. The technical optimization and safety management in the process of production and application are of great significance to enhance the added value and environmental friendliness of the industrial chain. In the future, with the progress of science and technology and the increase of demand, the application field and market prospect of isophthalonitrile will be further expanded.