Dimethylbenzene NEW

1. Keep the container sealed and stored in a cool, dry place, and ensure that the workplace has good ventilation or exhaust.

2. For the packaging and storage of this product, see benzene. Packaging, marking, storage, transportation and delivery acceptance shall be carried out according to ZBE300005.

1. If used and stored according to the specifications, it will not decompose, there is no known dangerous reaction, and oxides should be avoided.

2. It is a colorless transparent liquid with moderate toxicity. Operators should wear protective equipment.

3. This product has moderate toxicity. After being absorbed through the skin, the impact on health is much smaller than that of benzene. When the content of xylene in the air reaches 0.71×10-6, the odor can be felt, the content of toluene is 0.48×10-6, and that of benzene is 1.5×10-6. At such concentrations, benzene poses a risk of chronic poisoning, while p-xylene is of little concern. High-concentration xylene vapor, for example: above 1000×10-6, in addition to damaging mucous membranes and irritating the respiratory tract, it also exhibits excitement and anesthesia, and even causes hemorrhagic emphysema and death. Xylene has rarely caused poisoning by oral administration. If xylene or a solvent containing xylene is accidentally taken orally, it will strongly stimulate the esophagus and stomach, and cause vomiting, and may also cause hemorrhagic pneumonia. You should drink liquid paraffin immediately and seek medical treatment. The LC of xylene vapor to mice is 6000×10-6, and the minimum lethal dose to rats is 4000mg/kg.　

4. It is a mixture of o-xylene, m-xylene and p-xylene, called mixed xylene, and the content of m-xylene is more.

1. Molar refractive index: 35.9

2. Molar volume (cm 3 /mol) : 121.9

3. Isotonic specific volume (90.2K): 282.5

4. Surface tension (dyne/cm): 28.7

5. Dielectric constant: 2.39

6. Polarizability (10 -24 cm 3 ): 14.23

7. Monoisotope mass: 106.07825 Da

8. Nominal mass: 106 Da

9. Average mass: 106.165 Da

1. Hydrophobic parameter calculation reference value (XlogP): 3.2

2. Number of hydrogen bond donors: 0

3. Number of hydrogen bond acceptors: 0

4. Number of rotatable chemical bonds: 0

5. Topological Molecular Polar Surface Area (TPSA): 0

6. Number of heavy atoms: 8

7. Surface charge: 0

8. Complexity: 58.4

9. Number of isotope atoms: 0

10. Determine the number of atomic stereocenters: 0

11. Uncertain number of atomic stereocenters: 0

12. Determine the number of stereocenters of chemical bonds: 0

13. Uncertain number of chemical bond stereocenters: 0

14. Number of covalent bond units: 1

1. Properties: Colorless, transparent, flammable and volatile liquid with aromatic odor and poisonous.

2. Density (g/mL, 25/4°C): 0.86

3. Relative vapor density (g/mL, air=1): 3.7

4. Melting point (°C): -34

5. Boiling point (ºC, normal pressure): 137-140

6. Boiling point (ºC, 5.2kPa): not determined

7. Refractive index: 1.497

8. Flash point (°C): 25

9. Specific rotation (º): not determined

10. Autoignition point or ignition temperature (ºC): 463.8

11. Vapor pressure (kPa, 25ºC): not determined

12. Saturated vapor pressure (kPa, 60ºC): not determined

13. Heat of combustion (KJ/mol): not determined

14. Critical temperature (ºC): not determined

15. Critical pressure (KPa): Undetermined

16. The logarithm of the oil-water (octanol/water) partition coefficient: not determined

17. Upper limit of explosion (%, V/V): 7

18. Lower explosion limit (%, V/V): 1.1

19. Solubility: Compatible with various organic solvents such as ethanol, ether, and chloroform, but insoluble in water.