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Hydroquinone, also known as benzene-1,4-diol or quinol, is an aromatic organic compound that is a type of phenol, a derivative of benzene, having the chemical formula C 6 H 4 (OH) 2. It has two hydroxyl groups bonded to a benzene ring in a para position. It is a white granular solid. Substituted derivatives of this parent compound are also ...
There are three structural isomers: 1,2-dihydroxybenzene (the ortho isomer) is commonly known as catechol, 1,3-dihydroxybenzene (the meta isomer) is commonly known as resorcinol, and 1,4-dihydroxybenzene (the para isomer) is commonly known as hydroquinone.
5.1: Liquid Any material which exhibits a mean pressure rise time less than or equal to the pressure rise time of a 1:1 nitric acid (65 percent)/cellulose mixture and the criteria for Packing Group I and II are not met. Group II 5.2: All All Division 5.2 materials do not have a packing group in Column 5 of the 49 CFR 172.101 Table.
An essential oil is a concentrated hydrophobic liquid containing volatile (easily evaporated at normal temperatures) chemical compounds from plants.Essential oils are also known as volatile oils, ethereal oils, aetheroleum, or simply as the oil of the plant from which they were extracted, such as oil of clove.
The S&P 500 fell 0.5% to 5,955.25, falling as much as 1.2% during the day. The Nasdaq composite sank 1.4% to 19,026.39 as several influential Big Tech companies lost momentum and screeched lower.
Number 5 fuel oil is a residual-type industrial heating oil requiring preheating to 77–104 °C (171–219 °F) for proper atomization at the burners. [8] It may be obtained from the heavy gas oil cut, [ 7 ] or it may be a blend of residual oil with enough number 2 oil to adjust viscosity until it can be pumped without preheating. [ 8 ]
Through November, the United States had imported 70 million barrels of crude oil from Colombia, worth almost $5.4 billion. In 2023, the U.S. imported $5.6 billion worth of Colombian crude. Colombia was the No. 6 source of imported crude to the United States, accounting for just over 3% of oil imports in 2023.
Seed oils are characterized by the industrial process used to extract the oil from the seed and a high content of polyunsaturated fatty acids (PUFAs). [10] Critics' "hateful eight" oils consist of canola, corn, cottonseed, soy, sunflower, safflower, grapeseed, and rice bran oils, [ 8 ] which are creations of industrialization in the early ...