Maleic anhydride Maleic anhydride

Structural formula

• Numbering system
• Physical property data
• Toxicological data
• Ecological data
• Molecular structure data
• Computing chemical data
• More
  • Properties and Stability
  • Storage method
  • Synthesis method
  • Purpose

Numbering system

CAS number:108-31-6

MDL number:MFCD00005518

EINECS number:203-571-6

RTECS number:ON3675000

BRN number:106909

PubChem number:24897084

Physical property data

1. Properties: White oblique needle-shaped crystals with a strong pungent odor.

2. Density (g/mL, 60℃): 1.484

3. Relative vapor density (g/mL, air=1): 3.38

4. Melting point (ºC): 52.8

5. Boiling point (ºC, normal pressure): 202, 63.4ºC (0.67kpa)

6. Boiling point (ºC, 1.33 kPa): 78.7

7. Relative density (20℃, 4℃): 1.314⁶⁰

8. Flash point (ºC): 103.3

9. Relative density (25℃, 4℃): 1.2593¹⁰⁰

10. Autoignition point or ignition temperature (ºC): 447

11. Vapor pressure (mmHg, 20ºC): 0.02

12. Gas phase standard combustion heat (enthalpy) (kJ·mol^-1): -1461.5

13. Heat of combustion (KJ/mol): 1390

14. Standard heat of combustion (enthalpy) of crystalline phase (kJ·mol^-1): -1390.0

15. Crystal phase standard claims heat (enthalpy) (kJ·mol^-1): -469.8

16. Crystal phase standard hot melt (J·mol^-1·K^-1): 119

17. Explosion upper limit (%, V/V): 7.1

18 . Lower explosion limit (%, V/V): 1.4

19. Solubility: soluble in most organic solvents such as water, acetone, benzene, and chloroform.

20. Freezing point (ºC): 52.8

21. Gas phase standard claims heat (enthalpy) (kJ·mol^-1): -398.3

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22. Gas phase standard entropy (J·mol^-1·K^-1): 300.8

23. Gas phase standard generation is free Energy (kJ·mol^-1): -350.50

24. Refractive index_(n²⁰_{D )}：1.515

Toxicological data

1. Acute toxicity: ratResins, alkyd resins, nylon-4, etc. are also the main raw materials for the production of paper treatment agents, adhesives, inks, paints, fungicides, herbicides, insecticides, and plant growth regulators. 2.A reagent for measuring organic compounds with conjugated double bonds. It is also used in synthetic resins, coatings, pesticides, medicines, foods, and lubricant additives. 3.Used in organic synthesis and synthetic fiber intermediates. Used as analytical reagents, such as reagents for the determination of organic compounds with conjugated double bonds. 4.Used as a curing agent for epoxy resin, the reference dosage is 19 to 27 parts by mass. Due to high reactivity and volatility, it is not suitable to be used alone. When used, it is usually mixed with other acid anhydrides or tougheners (such as pyromellitic dianhydride). Curing conditions: 160~200℃/(2~4h). It can also be used to graft with EVA and PE blends to prepare new polymers for hot melt adhesives to improve adhesion. It can also be used as a modified monomer in the production of acrylic emulsion and grafted with SBS. In organic synthesis, it can be used to produce succinic acid, succinic anhydride, γ-butyrolactone, tetrahydrofuran, succinimide, succinic acid chloride, unsaturated polyester resin, dibutyl maleate (plasticizer agent) and other products. In the pesticide industry, it is used to manufacture malathion, maleic acid hydrazide, fungicides, herbicides, etc. In the pharmaceutical industry, it is used to manufacture long-acting sulfonamides, aminophylline and other drugs. In the food industry, it is used to produce sour agents such as malic acid and tartaric acid. It is also used as paper sizing agent, lubricating oil pour point depressant, water quality stabilizer, ink additive, fabric softening agent and used in the manufacture of surfactants, etc.