Para-Benzoquinone(PBQ)

1. Basic Information

Chemical Name: p-Benzoquinone (1,4-Benzoquinone)

Synonyms: Para-Benzoquinone, PBQ, p-Quinone

CAS No.: 106-51-4

Molecular Formula: C₆H₄O₂

Molecular Weight: 108.09 g/mol

EINECS No.: 203-405-2

2. Product Specifications

- Appearance: Yellow crystalline powder

- Assay: ≥99.0%

- Melting Point: 112.0–116.0°C

- Moisture: ≤0.5%

- Residue on Ignition: ≤0.05%

3. Physical & Chemical Properties

Appearance: Yellow crystalline powder with pungent odor

Melting Point: 112.0–116.0°C (sublimes readily)

Boiling Point: Sublimes at atmospheric pressure (no boiling point)

Density: 1.318 g/cm³ at 20°C

Solubility: Soluble in ethanol, ether, benzene; slightly soluble in cold water

Stability: Readily sublimes; decomposes under light or high temperature; exhibits oxidizing properties

4. Main Applications

- Used as a polymerization inhibitor for vinyl monomers to prevent uncontrolled polymerization

- Key intermediate for the synthesis of dyes, pharmaceuticals, and rubber additives

- Used in photographic chemicals, analytical reagents, leather tanning and wood preservation

- Used as oxidizing and dehydrogenating agent in organic synthesis

 5. Packaging & Storage

Packaging: 25kg net fiber drum, lined with polyethylene plastic bag

Storage: Store sealed in a cool, dry, well-ventilated warehouse. Keep away from fire, strong reducing agents, and direct sunlight.

6. Safety Information

Strong irritant to skin, eyes and respiratory tract. Wear safety goggles, gas mask and chemical-resistant gloves during operation.

 Flammable. Do not store or transport with strong reducing agents and organic combustibles.

In case of accidental contact, rinse affected area with plenty of water immediately and seek medical attention.