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Urea, also known as carbamide, is an organic compound with chemical formula CO(NH₂)₂. This amide has two –NH₂ groups joined by a carbonyl functional group. Urea serves an important role in the metabolism of nitrogen-containing compounds by animals and is the main nitrogen-containing substance in the urine of mammals
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Mixed xylenes are the second-most-important aromatic product in terms of world consumption for chemical manufacture, ranking behind benzene and ahead of toluene. Mixed xylenes refers to the equilibrium mixture of four isomers with the same C8H10 chemical formula. The isomers in order of natural occurrence are meta-xylene, ortho-xylene, para-xylene, and ethylbenzene.
Xylenes are produced with different processes. When in refineries, oil cuts enter the reforming units, aromatic compounds comprise a great proportion of the outflow material. Separating this flow into its components, accounts for more than 70 percent of global xylene supply. Also in the steam cracking process in olefin units, some quantity of Mixed Xylene is produced. In addition, disproportioning Toluene into Benzene and Xylene and treating Pyrolysis Gasoline are also different ways to produce Mixed Xylene.