purify oxygen
91Zinc smelting — is the process of converting zinc concentrates (ores that contain zinc) into pure zinc. The most common zinc concentrate processed is zinc sulfide,Citation | title = Compilation of Air Pollutant Emission Factors | publisher = U.S. Environmental… …
92Duluth Works — The Duluth Works was an industrial steel and cement manufacturing complex located in Duluth, Minnesota, in operation 1915 to 1987. The complex was operated by the United States Steel Corporation. Officially, the plant s purpose was to supply the… …
93History of chromatography — The history of chromatography spans from the mid 19th century to the 21st. Chromatography, literally color writing , was used mdash;and named mdash; in the first decade of the 20th century, primarily for the separation of plant pigments such as… …
94petroleum refining — Introduction conversion of crude oil into useful products. History Distillation of kerosene and naphtha The refining of crude petroleum owes its origin to the successful drilling of the first oil well in Titusville, Pa., in 1859. Prior to… …
95thorium processing — Introduction preparation of the ore for use in various products. Thorium (Th) is a dense (11.7 grams per cubic centimetre), silvery metal that is softer than steel. It has a high melting temperature of approximately 1,750° C (3,180°… …
96water purification — ▪ public health treatment of water to make it safe and acceptable for human use. Such treatment grew vastly in importance in the 20th century because of the growth of cities and development of industry and, consequently, of pollution. A… …
97Pathogen inactivation — A process designed to eliminate most pathogens viruses, bacteria and fungi from water, air or donated blood. Sewage purification systems depend upon pathogen inactivation to purify water to the extent it may sometimes even be safe enough to drink …
98distillation — Volatilization of a liquid by heat and subsequent condensation of the vapor; a means of separating the volatile from the nonvolatile, or the more volatile from the less volatile, part of a liquid mixture. [L. de (di …
99Discovery and development of cyclooxygenase 2 inhibitors — Cyclooxygenases are enzymes that take part in a complex biosynthetic cascade that results in the conversion of polyunsaturated fatty acids to prostaglandins and thromboxane(s).[1] Their main role is to catalyze the transformation of arachidonic… …
100Desulfonylation reactions — are chemical reactions leading to the removal of a sulfonyl group from organic compounds. As the sulfonyl functional group is electron withdrawing, methods for cleaving the sulfur carbon bonds of sulfones are typically reductive in nature.… …
