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|Payment Terms:||L/C, T/T, WU||Production Capacity:||400 Ton/Year|
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Paradichlorobenzene (CAS: 106-46-7)
White flaky or particle crystal
Schistose % ≥
Chlorobenzene % ≤
1,3-Dichlorobenzene % ≤
o-Dichlorobenzene % ≤
Trichlorobenzene % ≤
1,4-Dichlorobenzene (p-DCB, para-dichlorobenzene) is an organic compound with the formula C6H4Cl2. This colorless solid has a strong odor. In terms of its structure, the molecule consists of two chlorine atoms substituted for hydrogen at opposing sites on a benzene ring. p-DCB is used as a pesticide and a deodorant, most familiarly in mothballs in which it is a replacement for the more traditional naphthalene. p-DCB is also used as a precursor in the production of the polymer poly(p-phenylene sulfide).
p-DCB is produced by chlorination of benzene using ferric chloride as a catalyst:
C6H6 + 2 Cl2 → C6H4Cl2 + 2 HCl
The chief impurity is the 1,2 isomer. The compound can be purified by fractional crystallisation, taking advantage of its relatively high melting point of 53.5 °C; the isomeric dichlorobenzenes and chlorobenzene melt well below room temperature.
Disinfectant, deodorant, and pesticide
p-DCB is used to control moths, moulds, and mildew. It also finds use as a disinfectant in waste containers and restrooms and is the characteristic smell associated with urinal cakes. Its usefulness for these applications arises from p-DCB's low solubility in water and its relatively high volatility: it sublimes readily near room temperature.
Environmental and health effects
p-DCB is poorly soluble in water and is not easily broken down by soil organisms. Like many hydrocarbons, p-DCB islipophilic and will accumulate in the fatty tissues.
The United States Department of Health and Human Services (DHHS) and the International Agency for Research on Cancer(IARC) have determined that p-DCB may reasonably be anticipated to be a carcinogen, although there is no direct evidence. Animals given very high levels in water developed liver and kidney tumors.The United States Environmental Protection Agency (EPA) has set a target maximum contaminant level of 75 micrograms of p-DCB per liter ofdrinking water (75 μg/L). p-DCB is also an EPA-registered pesticide. The United States Occupational Safety and Health Administration (OSHA) has set a maximum level of 75 parts of p-DCB per million parts air in the workplace (75 ppm) for an 8-hour day, 40-hour workweek.
Under California's Proposition 65, p-DCB is listed as "known to the State to cause cancer".
Category: Other Chemical Products