Chinese name: methyl benzoate English name: methyl benzoate alias: methyl benzoate chemical formula: C8H8O2 molecular weight: 136. 15 CAS login number: 93-58-3 EINECS login number: 202-259-7 melting point:-12. 3 boiling point: 198 water solubility: insoluble in water density: 1.09 appearance: colorless and transparent oily liquid, fragrant flash point: 82.8 safety description: S23? S26？ S36？ S36/S37/S39 Hazard Symbol: Xn (Harmful) Hazard Description: R22? R36/37/38？ R42/43 Physical properties, chemical properties, preparation, functions and uses, precautions, hazard overview, first-aid measures, fire-fighting measures, emergency treatment of leakage, handling and storage, physical properties Inchi =1/C8H8O2/c1-kloc-0/0-8 (9) Melting point (℃):- 12.3 Relative density (water = 1): 1.09 Boiling point (℃): 198 Relative vapor density (air = 1): 4.68 Molecular formula: C8H8O2. Molecular structure data: 1, molar refractive index: 38.02; 2. Molar volume (m3/mol):127.3; 3. Isotonic specific volume (90.2 k): 312.1; 4. Surface tension (dyne/cm): 36.1; 5. Polarity (10-24cm3): 15.07. When exposed to open flame and high heat energy, chemical properties will lead to combustion and explosion. Contact with oxidant and react violently. Toxicological data: acute toxicity LD50:1117 mg/kg (by mouth in rats); 3330mg/kg (taken orally by mice); 2 170mg/kg (taken orally by rabbits). Ecological data: 1. Eco-toxicity EC50: 4.6 mg/L (30 minutes) (Microbiological toxicity test). 2. No data on biodegradability. 3. Non-biodegradable: When the pH value is 7 and 9, the hydrolysis half-life is 2.8a and 10d, respectively. In air, when the concentration of hydroxyl radical is 5.00× 105 /cm3, the degradation half-life is 18.5d (theoretically). Preparation 1, refining method: it often contains free impurities such as benzoic acid and methanol. Washing with sodium bicarbonate or potassium carbonate solution, drying with anhydrous potassium carbonate or sodium sulfate, and rectifying. 2. Put benzoic acid and methanol into a container, slowly add sulfuric acid while stirring, and heat 12h for reaction. After the reaction, methanol is recovered, then washed, dried and distilled under reduced pressure to obtain the finished product. 3. Methyl benzoate exists in natural clove oil, ylang ylang oil and moonlit sesame oil, and can be distilled from essential oil. Industrial production is carried out by esterification of benzoic acid with methanol in the presence of sulfuric acid. Mix benzoic acid with methanol, slowly add concentrated sulfuric acid, heat to about 70℃ and reflux for 4 hours to evaporate excess methanol. Cooling, separating acid solution, washing, drying, vacuum distilling, and collecting 104- 105℃(5.2kPa) fraction to obtain the finished product. The yield is above 90%. Function and use: 1, used as solvent for cellulose ether, cellulose ester, synthetic resin and rubber, and dyeing assistant for polyester fiber; In the aspect of perfume, it is mostly used for the preparation of artificial ylang ylang perfume and soap essence, and for the preparation of rose essence. It can also be used as a solvent in microscopic analysis. 2. Used for preparing essence, and also used as solvent for cellulose ester, cellulose ether, resin, rubber, etc. 3. It is a common perfume for preparing ylang ylang and tuberose. It is also used for the fragrance of daffodils, lavender, cloves and Spanish leather. It can be used with rock rose products, oak moss or tree moss products and vetiver oil to match the fragrance and obtain a pleasant flower fragrance. It can be used as cheap detergent, odor masking agent and industrial essence. It is also widely used in edible spices, such as strawberries. Precautions: health hazards: inhalation, oral administration or percutaneous absorption are harmful to the body. Steam or fog is harmful to eyes and upper respiratory tract. * * * On the skin. Sensitive to respiratory tract and skin. Danger of explosion: This product is flammable, toxic and allergic. Safety terminology s36 Wear appropriate protective clothing. Wear appropriate protective clothing. Risk term R22 is harmful if swallowed. Harmful if swallowed. First-aid measures for skin contact: take off contaminated clothes and thoroughly wash the skin with soapy water and clean water. Eye contact: Lift eyelids and rinse with running water or normal saline. See a doctor. Inhalation: leave the scene quickly and go to a place with fresh air. Keep the respiratory tract unobstructed. If you have difficulty breathing, give oxygen. If breathing stops, give artificial respiration immediately. See a doctor. Intake: Drink enough warm water to induce vomiting. See a doctor. Harmful combustion products of fire protection measures: carbon monoxide and carbon dioxide. Fire extinguishing method: use foam, dry powder, carbon dioxide and sand to extinguish the fire. Emergency treatment of leakage: evacuate the personnel in the leakage and pollution area to a safe area quickly, isolate them, and strictly restrict access. Cut off the fire. It is recommended that emergency personnel wear self-contained positive pressure breathing apparatus and protective clothing. Cut off the leakage source as much as possible. Prevent it from flowing into confined spaces such as sewers and flood discharge ditches. Small amount of leakage: adsorbed or absorbed by sand or other nonflammable substances. You can also brush the emulsion made of incombustible dispersant, and dilute the emulsion and put it into the wastewater system. A large number of leaks: damming or digging holes to contain them. Cover with foam to reduce steam disaster. Pump it into a tank car or a special collector with a pump, and recycle it or transport it to a waste disposal site for treatment. Precautions for operation, handling and storage: closed operation and local ventilation. Operators must be specially trained and strictly abide by the operating procedures. Operators are advised to wear self-priming filter gas mask (half mask), chemical safety glasses, permeable gas protective clothing and chemical gloves. Stay away from fire and heat sources, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation system and equipment. Prevent the steam in the workplace from leaking into the air. Avoid contact with oxidants and alkalis. When handling, handle with care to prevent the packaging and containers from being damaged. Equipped with corresponding varieties and quantities of fire fighting equipment and leakage emergency treatment equipment. Empty containers may leave harmful substances behind. Precautions for storage: Store in a cool and ventilated warehouse. Stay away from fire and heat sources. The reservoir temperature should not exceed 30℃. Keep the container sealed. Should be stored separately from oxidants, alkalis and edible chemicals, and should not be mixed. Equipped with corresponding varieties and quantities of fire fighting equipment. The storage area should be equipped with emergency response equipment for leakage and suitable accommodation materials.