[Chemical Knowledge]：Specification for storage and transport of 3-nitro-orthoxylene

3-Nitro-o-xylene (3-Nitro-o-xylene) is a common raw material for chemical production. Due to its flammable, toxic and harmful properties, it is necessary to strictly comply with relevant safety regulations during storage and transportation. In this paper, the physical and chemical properties, risk overview, first aid measures, fire control measures, leakage emergency treatment, operation disposal and storage, contact control/individual protection, physical and chemical characteristics, stability and reactivity, toxicological data, ecological data, waste disposal, transportation information, regulatory information and other contents of 3-nitro-orthoxylene are introduced in detail to ensure its safety and reliability.

1. physicochemical properties

3-nitro-o-xylene is a colorless or yellowish transparent liquid with aromatic odor. Molecular formula C8H7NO2, relative molecular mass 149.15, melting point -9.3 ℃, boiling point 222 ℃, density 1.169g/cm3, flash point 107 ℃, refractive index 1.5497, vapor pressure 0.098kPa(25 ℃). Insoluble in water, soluble in ethanol, ether and other organic solvents.

2. Hazard Overview

3-Nitro-o-xylene belongs to class 6.1 toxic substances and class 3 flammable liquids, with high toxicity and flammability, which is harmful to human body and environment. Long-term exposure may lead to chronic poisoning, acute poisoning can cause headache, dizziness, nausea, vomiting and other symptoms. At the same time, its steam and air can form an explosive mixture, which can cause combustion and explosion when exposed to open flame and high heat.

3. first aid measures

inhalation: quickly leave the scene to fresh air, keep the respiratory tract unobstructed. If it is difficult to breathe, give oxygen, if breathing stops, immediately carry out artificial respiration and seek medical treatment in time.

skin contact: immediately remove contaminated clothing, rinse with plenty of flowing water for at least 15 minutes, and seek medical attention.

eye contact: immediately lift the eyelid, rinse thoroughly with plenty of flowing water or normal saline for at least 15 minutes, and seek medical advice.

ingestion: gargle with water, drink milk or egg white, and seek medical attention in time.

4. fire protection measures

harmful combustion products: carbon monoxide, carbon dioxide, nitrogen oxides.

fire extinguishing method: move the container from the fire site to the open area as much as possible, spray water to keep the fire site container cool until the end of the fire extinguishing. Containers in a fire scene that have discolored or produced sound from the safety pressure relief device must be evacuated immediately. Spray the escaping liquid with water to dilute it into a non-combustible mixture and protect firefighters with misty water. Fire extinguishing agent can be selected from water, foam, dry powder, carbon dioxide, etc.
Emergency Treatment
for
5. Leakage
evacuate personnel from the contaminated area to the safety zone, isolate them, and strictly restrict access. Cut off the fire source. It is recommended that emergency personnel wear self-contained positive pressure breathing apparatus and protective clothing. Cut off the leak source as much as possible. Prevent from flowing into restricted spaces such as sewers and flood drainage ditches. Small amount of leakage: adsorption or absorption with sand or other non-combustible materials. Large leakage: build embankments or dig pits to contain. Transfer to tank truck or special collector by pump, recycle or transport to waste disposal site.

6. operation disposal and storage

operation precautions: closed operation, full ventilation. Operators must be specially trained and strictly abide by the operating procedures. It is recommended that the operator wear self-priming filtering gas mask (half mask), chemical safety goggles, anti-poison penetration overalls and rubber oil-resistant gloves. Keep away from fire and heat sources. Smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Prevent vapor leakage into the workplace air. Avoid contact with oxidizing agents. Handle lightly 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 leave harmful substances.

storage precautions: stored in a cool, ventilated warehouse. Keep away from fire and heat source. The temperature of the warehouse shall not exceed 37 ℃, and the container shall be kept sealed. Should be stored separately from the oxidant, do not mix storage. Explosion-proof lighting and ventilation facilities shall be adopted. It is forbidden to use mechanical equipment and tools that are easy to produce sparks. The storage area should be equipped with leakage emergency treatment equipment and suitable containment materials.

7. Exposure Control/Personal Protection

Occupational Exposure Limit: China MAC(mg/m3): No Standard; MAC(mg/m3) of the former Soviet Union: No Standard; TLVTN: No Standard; TLVWN: No Standard; Monitoring method: gas chromatography; Engineering control: production process is closed and fully ventilated; Respiratory system protection: when the concentration in the air exceeds the standard, wear self-priming filtering respirator (half mask). In case of emergency rescue or evacuation, it is recommended to wear air respirator; eye protection: wear chemical safety protection glasses; body protection: wear anti-poison penetration work clothes; hand protection: wear rubber and oil-resistant gloves; other protection: smoking, eating and drinking water are prohibited on the work site. After work, shower and change clothes. Maintain good hygiene habits.

8. physical and chemical properties

appearance and properties: colorless transparent liquid with aromatic odor; Melting point (℃):-9.3; Boiling point (℃):222; Relative density (water = 1):1.17; Relative vapor density (air = 1):4.53; Saturated vapor pressure