Terephthaloyl Chloride CAS No. 100-20-9

Terephthaloyl Chloride 

CAS No.: 100-20-9 | EC No.: 202-829-5

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1. Chemical Identification

Property	Specification
IUPAC Name	Benzene-1,4-dicarbonyl dichloride
Molecular Formula	C₈H₄Cl₂O₂
Molecular Weight	203.02 g/mol
Appearance	White to off-white flakes
Melting Point	79-81°C
Boiling Point	266°C
Density	1.34 g/cm³
pH	<0.5 (aqueous solution)

Synonyms:
TPC, Terephthaloyl dichloride, 1,4-Benzenedicarbonyl chloride

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2. Key Applications

Polymer Industry

High-Performance Fibers:
✓ Aramid fibers (Kevlar®-type)
✓ Flame-retardant textiles
✓ Nylon reinforcementSpecialty Plastics:
✓ Heat-resistant polyamides
✓ Engineering thermoplastics

Chemical Synthesis

Pharmaceutical Intermediates:
✓ UV absorber production
✓ Drug synthesisAgrochemicals:
✓ Pesticide intermediate

Industrial Applications

Dye and pigment manufacturingCrosslinking agent for resins

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3. Product Advantages

✔ High Reactivity – Excellent diacyl chloride for polycondensation
✔ Thermal Stability – Suitable for high-temperature processing
✔ Fiber Reinforcement – Enhances mechanical properties

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4. Physical & Chemical Properties

Solubility:Reacts with water/alcoholsSoluble in chlorinated solventsMoisture Sensitivity:Hydrolyzes rapidly in moist air

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5. Handling & Storage

Parameter	Requirement
Storage Temp	<25°C (under inert gas)
Packaging	25kg moisture-proof drums
Shelf Life	12 months
Special Notes	Handle under dry nitrogen

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6. Safety Information

Danger!

H314: Causes severe skin burns and eye damageH335: May cause respiratory irritationH290: May be corrosive to metals

Protective Measures:

P280: Wear acid-resistant gloves/face shieldP303+P361+P353: Skin contact wash procedureP305+P351+P338: Eye contact rinse protocol

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7. Quality Specifications

Purity: ≥99% (GC)Acid Content: ≤0.5%Iron Content: ≤10 ppm

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