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Phase behavior Triple point: 286.3 K (13.15 °C), ? Pa Critical point: 617 K (344 °C), 3500 kPa Std enthalpy change of fusion, Δ fus H o: 17.1 kJ/mol Std entropy change
p-Xylene (para-xylene) is an aromatic hydrocarbon. It is one of the three isomers of dimethylbenzene known collectively as xylenes . The p- stands for para- , indicating that the two methyl groups in p -xylene occupy the diametrically opposite substituent positions 1 and 4.
p-Xylene is the principal precursor to terephthalic acid and dimethyl terephthalate, both monomers used in the production of polyethylene terephthalate (PET) plastic bottles and polyester clothing. 98% of p-xylene production, and half of all xylenes produced is consumed in this manner. [10] [14] o-Xylene is an important precursor to phthalic ...
Despite the observed chemistry of para-xylylene (i.e. its rapid polymerization to poly-p-xylylene), which suggests the compound exists as a diradical, physical evidence unanimously concludes that the lowest electronic state of p-xylylene is a closed shell singlet. Additionally, several computational methods confirm this assignment. [13]
It is the fifth-highest point in the state, and the highest outside the San Francisco Peaks in the Flagstaff area. [9] An unnamed sub-peak with an elevation of 10,890 feet (3,319 m) exists approximately 0.5 miles (0.8 km) to the north of the summit that is off reservation and accessible to the public via maintained trail. [10] [11] A third peak ...
The Rio de Flag, which has historically been known as the River de Flag [2] and San Francisco river, [3] is a river in Arizona that runs through Flagstaff, originating from the San Francisco Peaks before draining into the Little Colorado River.
multiple broad peaks C─O alcohols: primary 1040–1060 strong, broad secondary ~1100 strong tertiary 1150–1200 medium phenols any 1200 ethers aliphatic 1120 aromatic 1220–1260 carboxylic acids any 1250–1300 esters any 1100–1300 two bands (distinct from ketones, which do not possess a C─O bond) C─N aliphatic amines any 1020–1220
In the petroleum refining and petrochemical industries, the initialism BTX refers to mixtures of benzene, toluene, and the three xylene isomers, all of which are aromatic hydrocarbons. The xylene isomers are distinguished by the designations ortho – (or o –), meta – (or m –), and para – (or p –) as indicated in the adjacent diagram.