Benzoyl chloride, a colorless liquid with a pungent odor. Soluble in ether, chloroform and benzene. It will gradually decompose in contact with water or ethanol to produce benzoic acid or ethyl benzoate and hydrogen chloride. Benzoyl chloride is an important intermediate for the preparation of dyes, perfumes, organic peroxides, medicines and resins. Benzoyl chloride is also used in photography and the production of artificial tannins, and has also been used as an irritant gas in chemical warfare.
Basic information
A compound in which the hydroxyl group in benzoic acid is replaced by a chlorine atom. The vapor is tear-gassing. Soluble in ether, chloroform and benzene. It will gradually decompose in contact with water or ethanol to produce benzoic acid or ethyl benzoate and hydrogen chloride.
Character description
Colorless, transparent and flammable liquid, smokes when exposed to the air. There is a special pungent smell. The vapor irritates the mucous membranes of the eyes and causes tears. Freezing point -1.0℃, refractive index 1.5537. When it meets water, ammonia or ethanol, it gradually decomposes to produce benzoic acid, benzamide or ethyl benzoate and hydrogen chloride.
Use
Benzoyl chloride is used as a raw material for organic synthesis, dyes and pharmaceuticals, to produce initiator dibenzoyl peroxide, tert-butyl peroxybenzoate, pesticides and herbicides. In terms of pesticides, a new type of inducible insecticide is an intermediate of Isoxathion (Karphos). Benzoyl chloride is an important benzoylation and benzylation reagent. Most of the benzoyl chloride is used to produce benzoyl peroxide, followed by the production of important chemical raw materials such as benzophenone, benzyl benzoate, benzyl cellulose and benzamide. Benzoyl peroxide is used in plastics. Polymerization initiator for polymer, catalyst for polyester, epoxy, acrylic resin production, self-setting agent for glass fiber material, crosslinking agent for silicone fluorine rubber, oil refining, flour bleaching, fiber decolorization, etc. There are more than 20 original benzoyl chloride manufacturers in China, and some benzoic acid manufacturers also produce benzoyl chloride with a production capacity of 10,000 tons. However, according to a survey in 2003, most manufacturers stopped production due to low-polluting routes, which were too low to produce profit, and the use of more polluting routes was restricted by the government, and the price of raw materials increased. In addition, the reaction of benzoic acid and benzoyl chloride can also produce benzoic anhydride. The main use of benzoic anhydride is as an acylating agent, and also as a component in bleaching agent and flux. It can also be used to prepare benzoyl peroxide. .
Benzoyl chloride is an important intermediate for the preparation of dyes, perfumes, organic peroxides, medicines and resins. Benzoyl chloride is also used in photography and the production of artificial tannins, and has also been used as an irritant gas in chemical warfare.
Emergency handling methods
1. Leakage emergency treatment
Evacuate personnel from the contaminated area to a safe area, and prohibit irrelevant personnel from entering the contaminated area. It is recommended that emergency personnel wear self-contained breathing apparatus and chemical protective clothing. Do not directly touch the leakage, and stop the leakage under safe conditions. Spray water mist to slow down volatilization (or diffusion), but do not spray water directly on the leakage or the leakage point. Do not let the leaked material come into contact with combustible materials (wood, paper, oil, etc.), absorb it with sand, vermiculite or other inert materials, and then collect and transport it to the waste disposal site for disposal. A large amount of leakage: It is best not to treat with water, and remove it under the guidance of a technician.
2. Protective measures
Respiratory protection: You must wear a gas mask when you may be exposed to its vapor or smoke. It is recommended to wear self-contained breathing apparatus during emergency rescue or escape.
Eye protection: wear chemical safety glasses.
Protective clothing: wear work clothes (made of anti-corrosion materials).
Hand protection: wear rubber gloves.
Others: After work, take a shower and change clothes. Store clothes contaminated by poisons separately and wash them before use. Maintain good hygiene.
First aid measures
Skin contact: Take off contaminated clothing and rinse thoroughly with soap and water. If burns occur, seek medical attention.
Eye contact: Lift the eyelid immediately and rinse with running water or normal saline for at least 15 minutes. Seek medical attention.
Inhalation: quickly leave the scene to a place with fresh air. Keep the airway unobstructed. Give artificial respiration if necessary. Seek medical attention.
Ingestion: When the patient is awake, rinse his mouth immediately and drink milk or egg white. Seek medical attention.
Extinguishing methods: dry powder, sand, carbon dioxide, foam. Water is forbidden.
Storage and transportation characteristics
[Operation precautions] Airtight operation, local exhaust. The operation is as mechanized and automated as possible. Operators must undergo special training and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter gas masks (full face masks), wear rubber acid and alkali resistant clothing, and rubber acid and alkali resistant gloves. Keep away from fire and heat sources, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Avoid producing smoke. Prevent the release of smoke and vapor into the air of the workplace. Avoid contact with oxidants, alkalis and alcohols. Particular attention should be paid to avoid contact with water. Operate and dispose in nitrogen. When handling, load and unload with care to prevent damage to packaging and containers. Equipped with corresponding types and quantities of fire-fighting equipment and leakage emergency treatment equipment. Empty containers may be harmful residues.
【Storage Precautions】Store in a cool, dry and well-ventilated warehouse. Keep away from fire and heat sources. The storage temperature does not exceed 25℃, and the relative humidity does not exceed 75%. Keep the container tightly closed. It should be stored separately from oxidants, alkalis, alcohols, and edible chemicals, and avoid mixed storage. Equipped with the appropriate variety and quantity of fire equipment. The storage area should be equipped with leakage emergency treatment equipment and suitable storage materials. The "five pairs" management system for extremely toxic substances should be strictly implemented.