Xem 1-20 trên 42 kết quả Petroleum chemical
  • Petroleum products are everywhere around us. They appear in visible forms, such as gasoline, diesel, kerosene, and aircraft fuels, and in less visible forms over the entire spectrum of industry, such as automobile lubricants, greases, carbon black for truck tires, bitumen for road building, the waterproofing in house roofs, feedstock for petrochemicals, synthetic fibers, and plastics. Petroleum feedstock is used in the manufacture of white mineral oils in eye ointment, hair oils, cosmetics, petroleum solvents, and pest control sprays....

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  • References to oil and gas production handbook, author Virgil B. Guthrie. Hopefully documents provide useful knowledge for engineering and technology students specializing in chemical industry - oil and gas.

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  • Petroleum mixtures consist primarily of relatively unreactive complex hydrocarbons covering a wide boiling range. Such mixtures are difficult to separate by most analytical techniques. Therefore, the petroleum industry has for many years played a leading role in the development of chromatographic methods of analysis. Since the last book specifically concerned with chromatographic analysis of petroleum appeared 15 years ago, numerous advances have been made including developments in liquid and supercritical fluid chromatography, ...

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  • In petroleum industry, it is desirable to produce lighter hydrocarbons such as gasoline, kerosene and gas–oil from unused heavy oils. Thus we have developed zirconia-supporting iron oxide catalysts View the MathML source to decompose petroleum residual oil (atmospheric distilled residual oil) with steam.

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  • Nolan, Dennis P. Application of HAZOP and What-If safety reviews to the petroleum, petrochemical & chemical industries by Dennis P. Nolan. p. cm. Includes bibliographical references and index. ISBN O-8155-1353-4 1. Chemical engineering--Safety measures.

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  • Low specific speed centrifugal pumps have low flow rates and high heads. They are widely applied in the petroleum, chemical, aerospace, pharmaceuticals, metallurgy, and light industries, among others. With the development of space technology and petrol chemical industry, the highly stable cavitation performance of centrifugal pumps has been put forward. Poor cavitation performance is one of the key problems in low specific speed centrifugal pumps.

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  • In the next instant, a frightening figure surged from beneath the water. Formed of the rats’ bones, the creature stood eight feet tall, built square and broad-chested as an ape. It stood on bowed legs that were whitely visible through the murky water. Instead of two arms, the bone creature possessed four, all longer than the legs. When it closed its hands, horns formed of ribs and rats’ teeth stuck out of the creature’s fists, rendering them into morningstars for all intents and purposes. The horns looked sharp-edged, constructed for slashing as well as stabbing.

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  • Hydrogen peroxide is a strong oxidant that can be injected into a contaminated zone to destroy petroleum contaminants. When injected to groundwater, hydrogen peroxide is unstable, and reacts with organic contaminants and subsurface materials. It decomposes to oxygen and water within hours of its introduction into groundwater generating heat in the process. Peroxide is typically shipped to a remediation site in liquid form at dose concentrations ranging from five percent to 50 percent by weight.

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  • Hydrogen peroxide is particularly effective when it reacts with ferrous iron (Fe2+ ) to produce Fenton's Reagent. Ferrous iron may be naturally present in the subsurface soils and/or groundwater, or it can be added as a catalyst solution together with the hydrogen peroxide to produce this aggressive chemical reaction. Hydrogen peroxide in the presence of ferrous iron (Fe2+ ) reacts to form hydroxyl radicals (OH•), ferric iron (Fe3+ ), and hydroxyl ions (OH- ). The hydroxyl ions are very powerful oxidizers, and react particularly with organic compounds.

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  • CHEMICAL ENGINEERING occupies a special place among scientific and engineering disciplines. It is an engineering discipline with deep roots in the world of atoms, molecules, and molecular transformations. The principles and approaches that make up chemical engineering have a long and rich history of contributions to the nation's technological needs. Chemical engineers play a key role in industries as varied as petroleum, food, artificial fibers, petrochemicals, plastics, ceramics, primary metals, glass, and specialty chemicals.

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  • Soil reactivity with chemical oxidants is also important when considering the costs of the use of chemical oxidation. Excessive loss of a chemical oxidant that is reacting with organics in soil, instead of reacting with the contaminants, may preclude the use of the technology as an economically viable approach to site remediation. Different chemical oxidation technologies are most appropriate for particular hydrogeologic conditions. For example, Fenton’s Reagant may not be ideal for groundwater with high concentrations of carbonate.

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  • Controlled oxidation is increasingly being practiced using solid peroxides, pH modifiers, and catalysts that promote the generation of free radicals. This new approach moderates the rate of dissolution and peroxide generation, which in turn controls that rate of reaction between peroxide and the petroleum contaminants. The use of slurried peroxides creates the opportunity to release oxidants and oxygen over a longer period, which can promote subsequent aerobic remediation.

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  • The main objective of the Citizen's Charter is to improve the quality of public services. This is done by letting people know the mandate of the Corporation, how one can get in touch with its officials, what to expect by way of services and how to seek a remedy if something goes wrong. The Citizen’s Charter does not by itself create new legal rights, but it surely helps in enforcing existing rights.

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  • Hydrogen, as an energy carrier, is widely regarded as a potential cost effective, renewable, and clean energy alternative to petroleum in order to mitigate energy shortage and global climate warming issues that the world is currently facing. However, storage of hydrogen is a substantial challenge, especially for applications in vehicles with fuel cells that use proton-exchange membranes (PEMs). Therefore, scientific community has started focusing their research activities on developing advanced hydrogen storage materials through nanotechnology. ...

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  • Khảo sát thành phần hoá học vỏ cây Bằng lăng nước trồng tại Trường Đại học Cần Thơ, chúng tôi đã cô lập và định danh được ba chất: stigmasterol, betulinic acid và hợp chất oleana-9(11),12-dien-3-ol, từ dịch chiết petroleum ether. Cấu trúc hóa học các chất này đã được làm sáng tỏ dựa vào những phương pháp phổ hiện đại: ESI-MS, NMR 1 chiều và 2 chiều. Nghiên cứu vẫn đang được tiếp tục thực hiện....

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  • Agriculture and forestry are poised on the brink of a quantum leap forward through the further application of exciting new tools such as genomics and transgenic plants. In the near future, it will be possible to produce a higher quantity of improved quality crops than even imagined just a few years ago.  In addition to feed and food, it will be possible to provide raw materials for industrial uses. For example, cotton fibers, wood ligno-celluloses, corn  carbohydrates, soybean oils, and other plant constituents will be altered via designed changes in metabolic pathways.

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  • Tourism is big business and getting bigger. In the 20 years from1980 to 2000 global tourism receipts increased at an annual rate of nearly 8 per cent, much faster than the rate of world economic growth of around 3 per cent. In 2000, income from tourism combined with passenger transport totaled more than $575 billion, making this sector the world number one export earner, ahead of automotive production, chemicals, petroleum and food (UNEP web site1).

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  • Tham khảo sách 'food culture in the mediterranean', văn hoá - nghệ thuật, ẩm thực phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Since the Second World War, and especially since the publication of Rachel Carson’s Silent Spring in 1962, there has been growing concern about contamination of the environment by “man-made” chemicals. These chemicals may be present in industrial and municipal effluents, in consumer or commercial products, in mine tailings, in petroleum products, and in gaseous emissions. Some chemicals such as pesticides may be specifically designed to kill biota present in natural or agricultural ecosystems. They may be organic, inorganic, metallic, or radioactive in nature.

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  • The McGraw-Hill Dictionary of Environmental Science provides a compendium of 8,800 terms that are relevant to environmental science and related fields of science and technology. The coverage includes terminology from more than 30 disciplines, including agriculture, botany, chemical engineering, civil engineering, climatology, ecology, forestry, genetics and evolution, geochemistry, geography and mapping, meteorology, microbiology, mycology, oceanography, petroleum and mining engineering, plant pathology, systematics, and zoology....

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