Polyether_Polyether Polyol Knowledge 1,2,3,4-Benzenetetracarboxylic acid

1,2,3,4-Benzenetetracarboxylic acid

1,2,3,4-Benzenetetracarboxylic acid structural formula

Structural formula

Business number 020E
Molecular formula C10H6O8
Molecular weight 254.15
label

1,2,4,5-tetracarboxylic acid benzene,

Pyromellitic acid,

Pyromellitic acid,

Pyromellitic acid,

C6H2(CO2H)4

Numbering system

CAS number:89-05-4

MDL number:MFCD00002471

EINECS number:201-879-5

RTECS number:DB9275000

BRN number:None

PubChem number:24891744

Physical property data

1. Properties: White to slightly yellow powdery crystal.

2. Density (g/mL, 25/4℃): 1.79

3. Melting point (ºC): Undetermined

4. Melting point (ºC) ): 276℃ (anhydrous), 242℃ (with 2 molecules of crystal water),

5. Crystalline phase standard combustion heat (enthalpy) (kJ·mol-1): -3244.02

6. Crystal phase standard claims heat (enthalpy) (kJ·mol-1): -1548.58

7. Crystal phase Phase standard combustion heat (enthalpy) (kJ·mol-1): -3221.76

8. Crystal phase standard claim heat (enthalpy) (kJ·mol-1 ): -1570.84

9. Specific rotation (º): Undetermined

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

11. Vapor pressure (kPa, 25ºC): Undetermined

12. Saturated vapor pressure (kPa, 60ºC): Undetermined

13. Heat of combustion (KJ/ mol): Undetermined

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Oil and water ( Log value of the partition coefficient (octanol/water): Undetermined

17. Explosion upper limit (%, V/V): Undetermined

18. Explosion lower limit (%, V/ V): Undetermined

19. Solubility: Easily soluble in alcohol, slightly soluble in ether and water. Can be sublimated.

Toxicological data

None

Ecological data

None

Molecular structure data

1. Molar refractive index: 53.97

2. Molar volume (cm3/mol): 139.5

3. Isotonic specific volume (90.2K ): 455.7

4. Surface tension (dyne/cm): 113.7

5. Polarizability (10-24cm3): 21.39

Computational ChemistryData

1. Hydrophobic parameter calculation reference value (XlogP): 0

2. Number of hydrogen bond donors: 4

3. Number of hydrogen bond acceptors: 8

4. Number of rotatable chemical bonds: 4

5. Number of tautomers:

6. Topological molecular polar surface area (TPSA): 149

7. Number of heavy atoms: 18

8. Surface charge: 0

9. Complexity: 327

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the number of chemical bond stereocenters Number: 0

14. Number of uncertain chemical bond stereocenters: 0

15. Number of covalent bond units: 1

Properties and stability

None

Storage method

This product should be stored in a sealed, cool and dry place.

Synthesis method

Obtained from the oxidation of 1,2,4,5-tetramethylbenzene (or 5-isopropyl-1,2,4-trimethylbenzene), or from the chloromethylation and oxidation of xylene.

Purpose

Organic synthesis. Epoxy resin hardener. Intermediate of polyimide ester.

This article is from the Internet, does not represent the position of Toluene diisocyanate reproduced please specify the source.https://www.polyether-factory.com/archives/18994

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