Toxicity and exposure. Xylenes are not acutely toxic, for example the LD50 (rat, oral) is 4300 mg/kg. p-Xylene vapor exposure over the recommended exposure limit of 100 parts per million (ppm) can cause irritation to eye, nose, and throat and possible chest tightening and an abnormal gait.
Is Para xylene carcinogenic?
The Department of Health and Human Services (DHHS) has not classified xylene as to its carcinogenicity. Both IARC and EPA have determined that xylene is not classifiable as to its carcinogenicity in humans, due to inadequate evidence for the carcinogenicity of xylenes in humans and animals.
What is P-Xylene used for?
Paraxylene is widely used as a feedstock (or “building block”) to manufacture other industrial chemicals, notably terephthalic acid (TPA), purified terephthalic acid (PTA) and dimethyl-terephthalate (DMT). TPA, PTA and DMT are used to manufacture polyethylene terephthalate (PET) polyesters, a kind of plastic.
Is P-xylene reactive?
Highly flammable. Insoluble in water. P-XYLENE may react with oxidizing materials.
Why is xylene banned?
Actually, IFRA banned musk xylene in June 2009 [3], based on risk assessments carried out by an independent Expert Panel [4] that deemed the substance had potential effects on the environment. According to IFRA, its membership accounts for approximately 90% of the global volume of fragrance materials.
What is P xylene soluble in?
P-XYLENE Properties 138 °C (lit.) Store at +5°C to +30°C. solubility water: soluble0.2g/L form Liquid pka >15 (Christensen et al., 1975) color Colorless Relative polarity 0.074 Odor. Like benzene; characteristic aromatic.
What makes xylene toxic?
Acute Exposure CNS toxicity may be due to the liposolubility of xylene in the neuronal membrane. It has been suggested that xylene interferes with the normal function of neuronal proteins. It has also been suggested that the toxicity of xylene may be due to some of its metabolic intermediates.
What xylene does to the body?
Short-term exposure of people to high levels of xylene can cause irritation of the skin, eyes, nose, and throat; difficulty in breathing; impaired function of the lungs; delayed response to a visual stimulus; impaired memory; stomach discomfort; and possible changes in the liver and kidneys.
Why is xylene a good solvent?
Xylene is a hydrocarbon composed solely of carbon and hydrogen and like other hydrocarbons it does not dissolve well in water. This makes it an excellent solvent for hydrocarbons and many hydrophobic or water-insoluble compounds like greases and various pesticides and herbicides.
How does xylene affect the body?
Why is xylene used in Diels Alder reaction?
Xylene (dimethylbenzene) is used as a high-boiling solvent so that the reaction will work fast enough to complete conveniently. The “cyclohexene” ring produced in every Diels-Alder reaction is hard to visualize, but consists of the six labeled atoms in the product.
How long does xylene stay in your system?
Usually, most of the xylene that is taken in leaves the body within 18 hours after exposure ends. About 4–10% of absorbed xylene may be stored in fat, which may prolong the time needed for xylene to leave the body.
What is the freezing point of p-xylene?
Freezing point is 56°F. (USCG, 1999) P-xylene is a xylene with methyl groups at positions 1 and 4. Commercial or mixed xylene usually contains about 40-65% m-xylene and up to 20% each of o-xylene and p-xylene and ethylbenzene.
Is p-xylene a hydrocarbon?
Laboratory Chemical Safety Summary (LCSS) p-Xylene is an aromatic hydrocarbon based on benzene with two methyl substituents with the chemical formula C8H10 or C6H4(CH3)2. P-XYLENE is a colorless watery liquid with a sweet odor. P-xylene is a xylene with methyl groups at positions 1 and 4.
Is mixed xylene a carcinogen?
EPA has classified mixed xylenes as a Group D, not classifiable as to human carcinogenicity. 1,4-xylene Computed by Lexichem TK 2.7.0 (PubChem release 2021.05.07)
What is the percentage of xylene in commercial xylene?
Commercial or mixed xylene usually contains about 40-65% m-xylene and up to 20% each of o-xylene and p-xylene and ethylbenzene. Xylenes are released into the atmosphere as fugitive emissions from industrial sources, from auto exhaust, and through volatilization from their use as solvents.
