Xem 1-17 trên 17 kết quả Natural hydrocarbon
  • Natural gas is a vital component of the world's supply of energy and an important source of many bulk chemicals and speciality chemicals. It is one of the cleanest, safest, and most useful of all energy sources, and helps to meet the world’s rising demand for cleaner energy into the future. However, exploring, producing and bringing gas to the user or converting gas into desired chemicals is a systematical engineering project, and every step requires thorough understanding of gas and the surrounding environment.

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  • Current regulatory policies place the alternative fuel industry at a critical junction. Emissions from alternative - fueled bus engines consistently indivate lower emissions of reactive hydrocarbons, carbon monoxide, and particulate matter thaan diesel engines.

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  • The first edition of Toxicological Chemistry (1989) was written to bridge the gap between toxicology and chemistry. It defined toxicological chemistry as the science that deals with the chemical nature and reactions of toxic substances, their origins and uses, and the chemical aspects of their exposure, transformation, and elimination by biological systems. It emphasized the chemical formulas, structures, and reactions of toxic substances. The second edition of Toxicological Chemistry (1992) was significantly enlarged and increased in scope compared to the first edition.

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  • The ‘electronic book’ is a feature of this early 21st Century. I have been in academic life for several decades, and have I hope responded with flexibility to changes over that time. I have been using a word processor on a daily basis for twenty years and am deeply conscious of the advantages over even the most advanced typewriters. The first time I gave a presentation using Microsoft PowerPoint was in India about six years ago. I have with enthusiasm used PowerPoint for every invited talk or conference contribution I have given since....

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  • The contributions in this book present an overview of utting edge research on natural gas which is a vital component of world’s supply of energy. Natural gas is combustible mixture of hydrocarbon gases, primarily methane but also heavier gaseous hydrocarbons such as ethane, propane and butane. Unlike other fossil fuels, natural gas is clean burning and emits lower levels of potentially harmful by-products into the air. Therefore, it is considered as one of the cleanest, safest, and most useful of all energy sources applied in variety of residential, commercial and industrial fields....

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  • Secondary aerosol is produced by the oxidation of primary gases (sulphur dioxide, SO2, nitrogen oxides, NOx, and volatile organic compounds, VOCs,) to sulphuric and nitric acid, and organic vapours, followed by their gas-particle conversion [26, 77]. Finally, some of these acidic gases can be neutralised by reaction with ammonia gas or calcium carbonate (calcite) forming secondary aerosol (ammonium sulphate, ammonium nitrate, calcium sulphate, calcium nitrate).

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  • The atmosphere is a mixture of several gases surrounding the earth's crust and has a layer that protects and preserves the lives of human beings and keeping the materials in good condition and functionality. Once damaged, by pollutants emitted from anthropogenic and natural sources, the atmosphere reduces the levels of protection due to formation of the ozone layer. The presence of contaminants in indoors and outdoors influenced by climatic factors, has a negative effect on human health and the durability of materials. Indoor air quality is a reflection of the outside air....

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  • The modern organic movement began in Europe around the 1920s, when a group of farmers and consumers sought an alternative to the industrialisation of agriculture. Of key importance to these farmers and consumers was caring for the soil and natural processes upon which agriculture depends, including not using inputs such as artificial fertilisers and synthetic chemicals. A leading figure at the time was the Austrian thinker, Rudolf Steiner, whose ideas led to a system of cultivation known as biodynamic.

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  • IUPAC names: hydrocarbon + “oic acid”. Some natural occurring acids & derivatives. From Grignard reagents. From nitriles: Have 1 more carbon as compared to the halide.

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  • The major source of liquid fuels is crude petroleum; other sources are shale and tar sands. Synthetic hydrocarbon fuels—gasoline and methanol—can be made from coal and natural gas. Ethanol, some of which is used as an automotive fuel, is derived from vegetable matter.

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  • Pesticides are divided to insecticides, fungicides, herbicides, rodenticides, acaricides and nematocides according to the organisms that they affect. There are various forms of insecticides; most are repellants or insect growth regulators used in agriculture, public health, horticulture or food storage. It is evident that insecticides have been used to boost food production to a considerable extent and to control disease vectors.

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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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  • An additional benefit of hydrogen peroxide and Fenton's Reagent is the temporary increase of oxygen levels in and around the treatment area. The increased oxygen levels at the fringes of the treatment area can enhance naturally occurring aerobic biodegradation processes that reduce contaminant mass. While there may be concerns about oxidizing hydrocarbon-degrading bacteria in the chemical oxidation treatment area, many studies have shown that soil cannot be readily sterilized by Fenton's Reagent and that microbial populations rapidly rebound following chemical oxidation treatment.

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  • CHAPTER 4 7 LIQUID FOSSIL FUELS FROM PETROLEUM Richard J. Reed North American Manufacturing Company Cleveland, Ohio 47.1 47.2 INTRODUCTION 1 1 5 7 47.3 SHALE OILS 1528 FUEL OILS 1 1 5 7 47.4 47.2.1 Kerosene 1519 47.2.2 Aviation Turbine Fuels 1525 47.5 47.2.3 Diesel Fuels 1 2 5 6 47.2.4 Summary 1 2 5 8 OILS FROM TAR &ANDS 1 2 5 8 OIL-WATER EMULSIONS 1 2 5 8 47.1 INTRODUCTION The major source of liquid fuels is crude petroleum; other sources are shale and tar sands. Synthetic hydrocarbon fuels—gasoline and methanol—can be made from coal and natural gas.

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  • Benzene is a colourless, liquid, flammable, aromatic hydrocarbon that is a component of petrol, or may result from incomplete combustion of fuels. Benzene, a natural component of crude oil, is emitted from a range of industrial and combustion sources. The major source of benzene is motor vehicles—both vehicle exhaust (contributing approximately 75% to 80% of emissions) and evaporative emissions (including evaporation losses from motor vehicles and evaporation losses during the handling, distribution and storage of petrol).

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  • The ring-hydroxylating dioxygenase (RHD) from Sphingomonas CHY-1 is remarkable due to its ability to initiate the oxidation of a wide range of polycyclic aromatic hydrocarbons (PAHs), including PAHs containing four- and five-fused rings, known pollutants for their toxic nature.

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  • Lipids are a class of biological molecules defined by low solubility in water and high solubility in nonpolar solvents. As molecules that are largely hydrocarbon in nature, lipids represent highly reduced forms of carbon and, upon oxidation in metabolism, yield large amounts of energy. Lipids are thus the molecules of choice for metabolic energy storage. What are the structure, chemistry, and biological function of lipids?

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