Download or read book Process for the Removal of Acid Forming Gases from Exhaust Gases and Production of Phosphoric Acid written by and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Exhaust gases are treated to remove NO or NO.sub.x and SO.sub. 2 by contacting the gases with an aqueous emulsion or suspension of yellow phosphorous preferably in a wet scrubber. The addition of yellow phosphorous in the system induces the production of O.sub. 3 which subsequently oxidizes NO to NO.sub. 2. The resulting NO.sub. 2 dissolves readily and can be reduced to form ammonium ions by dissolved SO.sub. 2 under appropriate conditions. In a 20 acfm system, yellow phosphorous is oxidized to yield P.sub. 2 O.sub. 5 which picks up water to form H.sub. 3 PO.sub. 4 mists and can be collected as a valuable product. The pressure is not critical, and ambient pressures are used. Hot water temperatures are best, but economics suggest about 50.degree. C. The amount of yellow phosphorus used will vary with the composition of the exhaust gas, less than 3% for small concentrations of NO, and 10% or higher for concentrations above say 1000 ppm. Similarly, the pH will vary with the composition being treated, and it is adjusted with a suitable alkali. For mixtures of NO.sub.x and SO.sub. 2, alkalis that are used for flue gas desulfurization are preferred. With this process, better than 90% of SO.sub. 2 and NO in simulated flue gas can be removed. Stoichiometric ratios (P/NO) ranging between 0.6 and 1.5 were obtained.
Download or read book Process for the Removal of Acid Forming Gases from Exhaust Gases written by and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Exhaust gases are treated to remove NO or NO.sub.x and SO.sub. 2 by contacting the gases with an aqueous emulsion or suspension of yellow phosphorus preferably in a wet scrubber. The pressure is not critical, and ambient pressures are used. Hot water temperatures are best, but economics suggest about 50.degree. C. are attractive. The amount of yellow phosphorus used will vary with the composition of the exhaust gas, less than 3% for small concentrations of NO, and 10% or higher for concentrations above say 1000 ppm. Similarly, the pH will vary with the composition being treated, and it is adjusted with a suitable alkali. For mixtures of NO.sub.x and SO.sub. 2, alkalis that are used for flue gas desulfurization are preferred. With this process, 100% of the by-products created are usable, and close to 100% of the NO or NO and SO.sub. 2 can be removed in an economic fashion.
Download or read book Acid Precipitation written by and published by . This book was released on 1992-07 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Processes to Remove Acid Forming Gases from Exhaust Gases written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present invention relates to a process for reducing the concentration of NO in a gas, which process comprises: (A) contacting a gas sample containing NO with a gaseous oxidizing agent to oxidize the NO to NO.sub. 2 ; (B) contacting the gas sample of step (A) comprising NO.sub. 2 with an aqueous reagent of bisulfite/sulfite and a compound selected from urea, sulfamic acid, hydrazinium ion, hydrazoic acid, nitroaniline, sulfanilamide, sulfanilic acid, mercaptopropanoic acid, mercaptosuccinic acid, cysteine or combinations thereof at between about 0.degree. and 100.degree. C. at a pH of between about 1 and 7 for between about 0.01 and 60 sec; and (C) optionally contacting the reaction product of step (A) with conventional chemical reagents to reduce the concentrations of the organic products of the reaction in step (B) to environ-mentally acceptable levels. Urea or sulfamic acid are preferred, especially sulfamic acid, and step (C) is not necessary or performed.
Download or read book Official Gazette of the United States Patent and Trademark Office written by and published by . This book was released on 1998 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Pollution Abstracts written by and published by . This book was released on 1972 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Official Gazette of the United States Patent Office written by United States. Patent Office and published by . This book was released on 1974 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book N A P C A Abstract Bulletin written by United States. Environmental Protection Agency and published by . This book was released on 1971 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Public Health Service Publication written by and published by . This book was released on 1967 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Pollution Engineering Manual written by Los Angeles County (Calif.). Air Pollution Control District and published by . This book was released on 1973 with total page 987 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluorine Its Compounds and Air Pollution written by Air Pollution Technical Information Center and published by . This book was released on 1976 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluorine Its Compounds and Air Pollution written by United States. Environmental Protection Agency. Office of Air Quality Planning and Standards and published by . This book was released on 1976 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fertilizer Encyclopedia written by Vasant Gowariker and published by John Wiley & Sons. This book was released on 2009-04-08 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fertilizers are key for meeting the world s demands for food, fiber, and fuel. Featuring nearly 4,500 terms of interest to all scientists and researchers dealing with fertilizers, The Fertilizer Encyclopedia compiles a wealth of information on the chemical composition of fertilizers, and includes information on everything from manufacturing and applications to economical and environmental considerations. It covers behavior in soil, chemical and physical characteristics, physiological role in plant growth and soil fertility, and more. This is the definitive, up-to-date reference on fertilizers. This book is not available for purchase from Wiley in the country of India. Customers in India should visit Vasudha Research & Publications Pvt. Ltd. at www.fertilizer-encyclopedia.com
Download or read book Fertilizer Manual written by United Nations Industrial Development Organization and published by . This book was released on 1980 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertilizer Abstracts written by and published by . This book was released on 1973 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fertilizer Manual written by Travis P. Hignett and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Fertilizer Manual was prepared by the International Fertilizer Development Center (IFDC) as a joint project with the United Nations Industrial Development Organi zation (UNIDO). It is designed to replace the UN Fertilizer Manual published in 1967 and intended to be a reference source on fertilizer production technology and economics and fertilizer industry planning for developing countries. The aim of the new manual is to describe in clear, simple language all major fertilizer processes, their requirements, advan tages and disadvantages and to show illustrative examples of economic evaluations. The manual is organized in five parts. Part I deals with the history of fertilizers, world outlook, the role of fertilizers in agriculture, and raw materials and includes a glossary of fertilizer-related terms. Part II covers the production and transportation of ammonia and all important nitrogen fertilizers-liquids and solids. Part III deals with the characteristics of phosphate rock, production of sulfuric and phosphoric acid, and all important phosphate fertilizers, including nitrophosphates and ammonium phosphates. Part IV deals with potash fertilizers-ore mining and refining and chemical manufac ture; compound fertilizers; secondary and micronutrients; controlled-release fertilizers; and physical properties of fertilizers. Part V includes chapters on planning a fertilizer industry, pollution control, the economics of production of major fertilizer products anJ intermediates, and problems facing the world fertilizer industry.
Download or read book Air Pollution Abstracts written by and published by . This book was released on 1974-05 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
