Overview
Biphenyl, also known as diphenyl, is an organic compound consisting of two benzene rings connected by a single covalent bond. It is a colorless to pale yellow crystalline solid with a distinct aromatic odor. Biphenyl is naturally found in coal tar and crude oil but is primarily produced synthetically for industrial applications. Due to its stability and low reactivity, biphenyl serves as a versatile intermediate in chemical synthesis. It is also used as a heat transfer fluid and as a preservative in citrus fruit packaging. The compound's unique properties make it valuable in various industrial processes.
Physical and Chemical Properties
Biphenyl exhibits moderate solubility in organic solvents like ethanol and ether but is virtually insoluble in water. Its melting point is 69.2°C, and it boils at 255°C under standard conditions. The compound's density is 1.04 g/cm³, and it has a vapor pressure of 0.01 mmHg at 20°C. Chemically, biphenyl is relatively stable but can undergo electrophilic aromatic substitution reactions. It is resistant to oxidation under normal conditions, which contributes to its use in high-temperature applications. The compound's aromatic structure gives it characteristic UV absorption properties, making it useful in spectroscopic analysis.
Main Applications
In industrial settings, biphenyl is primarily used as a heat transfer fluid in high-temperature systems, particularly in the form of eutectic mixtures with diphenyl ether. These mixtures can operate at temperatures up to 400°C without significant decomposition. The compound also serves as a key intermediate in the production of polychlorinated biphenyls (PCBs), although PCB production is now heavily regulated. Other applications include use as a fungicide for citrus fruits, a dye carrier in textile processing, and a solvent in organic synthesis. In laboratories, biphenyl is sometimes used as a calibration standard for chromatography.
Safety and Storage
Biphenyl is classified as harmful if swallowed or inhaled, and it can cause skin and eye irritation. Proper personal protective equipment (PPE) including gloves, goggles, and respiratory protection should be used when handling the compound, especially in powder form. For storage, biphenyl should be kept in tightly sealed containers in a cool, dry, well-ventilated area away from oxidizing agents. The compound is stable under normal storage conditions but may form explosive dust-air mixtures at high concentrations. Spills should be contained and cleaned up immediately using appropriate absorbent materials.
B2B Procurement Guide
When procuring biphenyl for industrial use, buyers should specify the required purity grade, which typically ranges from technical grade (90-95%) to high purity (99%+). Technical grade is sufficient for most heat transfer applications, while higher purity is needed for chemical synthesis. Key procurement considerations include verifying supplier certifications, requesting material safety data sheets (MSDS), and confirming packaging options (typically 25kg bags or drums). Buyers should also inquire about batch testing documentation and the supplier's quality control procedures. For large-volume purchases, consider negotiating long-term contracts to stabilize pricing.
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