Production Raw Materials Oxidation Trimellitic Anhydride (TMA) CAS 552-30-7 Tma

• Customization: Available
• CAS No.: 552-30-7
• Formula: C9h4o5
• EINECS: 209-008-0
• Source: Organic Acids
• Appearance: White Podwer
• Grade Standard: Industrial Grade
• Colour: White
• Transport Package: 25kg/1.1tons
• Specification: 25KG/1.1TONS
• Origin: Jiangsu
• HS Code: 29173980
• Production Capacity: 50000000

Product Description

Detailed product description of trimellitic anhydride (TMA) and its main application industries: 

Product Description: Trimellitic Anhydride (TMA) 

1. Product Overview
Chemical Name: 1,2,4-Benzene Tricarboxylic Anhydride; Parabenzene Tricarboxylic Anhydride
Molecular Formula:C9H4O5
Molecular Weight: 192.13 g/mol
CAS Number: 552-30-7
Appearance: White to slightly yellow flaky, needle-like crystals or powder, with a slight special odor.
Main Source: Industrially, it is mainly produced by liquid-phase air catalytic oxidation of parabenzene (1,2,4-trimethylbenzene). The oxidation product is parabenzene acid, and then dehydrated cyclization yields parabenzene tricarboxylic anhydride.

It is a key monomer for synthesizing various high-performance chemicals. 
2. Key Physical and Chemical Properties
Melting point: Approximately 164 - 168 °C (dehydration cyclization temperature)
Boiling point: Approximately 240 - 245 °C (sublimes at 14 mmHg, readily decomposes at normal pressure)
Density: Approximately 1.54 g/cm³ (solid)
Flash point: Approximately 227 °C (open cup) - Flammable solid. Solubility:
It dissolves in organic solvents butanone, dimethylformamide (DMF), dimethylsulfoxide (DMSO), and hot xylene.

Hygroscopicity: It is prone to absorbing moisture, and after absorbing water, it hydrolyzes to form (losing reactivity), so it must be strictly sealed and stored in a moisture-proof environment. 
3. Main Specifications (Typical Industrial Grade)
Purity: ≥ 99.0% or ≥ 99.5%
Appearance: White to slightly yellow crystalline or powder.
Melting Point: 164 - 168 °C
Acid Value: ≥ 865 mg KOH/g (Theoretical Value: 875)
Color (APHA): ≤ 50 or lower (Melted state or solution).
Free Acid (based on phthalic acid): ≤ 0.5%
Moisture: ≤ 0.1%
Ash Content: ≤ 0.01% 
4. Safety and Storage
Key point: Strictly prevent moisture! Store in a cool, dry, well-ventilated warehouse. Sealed packaging, avoid contact with air (moisture).
Keep away from fire sources, heat sources.
Personal protection during operation:
Top priority: Prevent inhalation and contact of dust!
Operators must wear dust masks (N95 or higher grade), chemical safety goggles, chemical-resistant gloves (such as nitrile rubber, chloroprene rubber), and anti-static work clothes.