Environmental Hazards Editor

I. Health hazards

Route of invasion: Inhalation, ingestion, percutaneous absorption.

Health hazards: Similar to aniline, but weaker than aniline, can cause ulceration on skin contact. Absorption leads to the formation of methemoglobin and cyanosis. Nausea, dizziness, headache and blood effects can occur after contact.

Toxicological data and environmental behaviour

Acute toxicity: LD501410mg/kg (rat oral); 1770mg/kg (rabbit percutaneous)

HAZARDOUS PROPERTIES: In case of open flame, high heat or contact with oxidizing agent, there is a risk of burning and explosion. Toxic nitrogen oxide fumes are released by heat decomposition.

Combustion (decomposition) products: carbon monoxide, carbon dioxide, nitrogen oxides.

Monitoring method editing

Gas Chromatography Method for the Determination of Hazardous Substances in Air (Second Edition), edited by Hang Shih-ping [2]

Environmental standards editor

former Soviet Union

Maximum permissible concentrations of hazardous substances in the air in the vehicle room

0.2mg/m3

Former USSR (1977)

Maximum permissible concentrations of harmful substances in the atmosphere in residential areas

0.0055mg/m3(maximum value, day/night average)

Former USSR (1975)

Maximum permissible concentration of hazardous substances in water bodies

0.1mg/L

Disposal method editing

Spill response

Evacuate personnel from the spill contaminated area to a safe area, prohibit unrelated personnel from entering the contaminated area, and cut off the fire source. It is recommended that emergency responders wear self-contained breathing apparatus (SCBA) and chemical protective clothing. Do not come into direct contact with the spill, and plug the leak while ensuring safety. Spraying water mist will reduce evaporation, but will not reduce the flammability of the spill in the confined space. Absorb with a mixture of sand or other nonflammable sorbent and collect for disposal at a waste disposal site. If large spills are spilled, containment using berms is used, followed by collection, transfer, recycling, or disposal without hazardous treatment.

Waste disposal method: incineration, incinerator with afterburning chamber, nitrogen oxides from incinerator through the scrubber to remove.

Protective measures

Respiratory protection: Wear a gas mask when there is a risk of exposure to vapours. Wear a self-contained breathing apparatus (SCBA) in the event of an emergency rescue or escape.

Eye protection: Wear chemical safety glasses.

Protective Clothing: Wear tight-sleeved overalls and long rubber boots.

Hand protection: Wear rubber gloves.

Others: Smoking, eating and drinking are strictly prohibited at the work site. Change and wash work clothes promptly. Do not drink alcohol before or after work, and use warm water for bathing. Monitor for toxins. Conduct pre-employment and periodic medical examinations.

First Aid Measures

Skin contact: Remove contaminated clothing immediately and rinse thoroughly with soap and water. Pay attention to hands, feet and nails.

Eye Contact: Immediately lift eyelids and rinse with plenty of running water or saline solution.

Inhalation: quickly remove from scene to fresh air. Administer oxygen if respiratory distress occurs. If respiratory arrest occurs, resuscitate immediately. Seek medical attention.

Ingestion: gargle, drink water, lavage stomach and then give oral activated charcoal to induce diarrhea in case of accidental ingestion. Seek medical attention.

Fire extinguishing method: fog water, foam, carbon dioxide, dry powder, sand.

Production method editing

It is obtained by the reaction between aniline and methanol in the presence of sulfuric acid at high temperature and high pressure. The consumption of raw materials: aniline 790kg/t, methanol 625kg/t, sulfuric acid 85kg/t. The reaction of aniline and trimethyl phosphate can be prepared in the laboratory.

Function and use editing

It is the main raw material of the anti-inflammatory and analgesic drug “Mefenamic acid”, and can also be used as an intermediate material of dyestuff, pesticides and other chemical products.

Solubility: Insoluble in water, soluble in acid solution, ethanol, ether, chloroform, carbon tetrachloride, benzene.

Main Uses: Used as intermediate of dyestuff, used in the production of vanillin, azo dyestuff, triphenylmethane dyestuff, also can be used as solvent, stabilizer, analytical reagent, etc.

Application: Usually a 10% solution of styrene, known as #2 accelerant. Often used in conjunction with 2# curing agent (dibenzoyl peroxide). It is a very effective curing system where the resin contains a large amount of free phenol or where the polyester molecular chain contains a large molecular branched structure. (e.g. for vinyl ester resin curing, bisphenol A type polyester resin curing, chlorinated bridge anhydride type polyester resin, etc.)

Production method

edit

It is obtained by the reaction between aniline and methanol in the presence of sulfuric acid at high temperature and high pressure. The consumption of raw materials: aniline 790kg/t, methanol 625kg/t, sulfuric acid 85kg/t. The reaction of aniline and trimethyl phosphate can be prepared in the laboratory.

Function and use

edit

It is the main raw material of the anti-inflammatory and analgesic drug “Mefenamic acid”, and can also be used as an intermediate material of dyestuff, pesticides and other chemical products.

Solubility: Insoluble in water, soluble in acid solution, ethanol, ether, chloroform, carbon tetrachloride, benzene.

Main Uses: Used as intermediate of dyestuff, used in the production of vanillin, azo dyestuff, triphenylmethane dyestuff, also can be used as solvent, stabilizer, analytical reagent, etc.

Application: Usually a 10% solution of styrene, known as #2 accelerant. Often used in conjunction with 2# curing agent (dibenzoyl peroxide). It is a very effective curing system where the resin contains a large amount of free phenol or where the polyester molecular chain contains a large molecular branched structure. (e.g., for vinyl ester resin curing, curing of bisphenol A polyester resins, chlorinated bridge anhydride polyester resins, etc.)

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