New PDF release: Ammonia: principles and industrial practice

By Max Appl

ISBN-10: 3527295933

ISBN-13: 9783527295937

Ammonia is likely one of the most crucial inorganic easy chemical compounds, not just for the manufacture of fertilizers (85%) but additionally for the construction of plastics, fibers, explosives, and intermediates for dyes and prescription drugs. it's a necessary response part for the synthesis of diverse natural chemical compounds used as solvents and intermediates. The e-book presents a realistic and up to date account of the product houses, synthesis and response mechanisms, together with catalysis and advertisement catalysts, glossy creation know-how for various feedstocks, caliber requisites and environmental health and wellbeing and defense points, makes use of and fiscal info of this significant commodity chemical. It additionally discusses views of destiny advancements of business ammonia construction. Over 1400 references to the proper literature entire this concise presentation, whose goal is to notify the reader of the current prestige of the idea and perform of business ammonia creation. Chemical engineers, engineers and chemists in undefined, engineering businesses, catalyst brands, apparatus makers and chemical engineering college departments will surely cash in on this complete overview in keeping with the author's lengthy sensible adventure in a number one technical administration place of 1 of the most important ecu ammonia manufacturers.

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Additional resources for Ammonia: principles and industrial practice

Example text

Equation (19), used by NIELSENet al. [198], is a combination of these model equations, developed by OZAKI et al. [199], that uses fugacities instead of partial pressures. A similar equation is found in [200]. Additionally, a number of modified equations were proposed and tested with existing experimental data and industrial plant results [a011- [204]. Near the thermodynamical equilibrium, Equation (19) transforms into Equation (17) [1571, [1701. Surface science based ammonia kinetics (1071, [log], [183], [I841 are presently still viewed as an academic exercise rather than as a practical tool for engineering.

A critical evaluation of our present knowledge of the reaction mechanism was recently made by SCHLOGL[156]. Other reaction mechanisms have been debated for reaction temperatures below 330 "C [1301, 11571, 11581- [1691. These propose participation of diatomic nitrogen, or of adsorption complexes containing diatomic nitrogen, in the rate-determining step (see [loll, [lo21 for further literature). NIELSENet al. investigated ammonia synthesis on a commercial Topsne catalyst, KM IR, over a wide temperature range.

6 % magnesium oxide were recommended for older plants, for example, classical Casale plants, which operated at up to 80 MPa (800 bar) pressure and in which catalyst end temperature reached 650 "C (see for example [331). 7% K,O (2451. For higher operating temperatures, still higher V,O, contents are recommended. Silicon dioxide additions shift the optimum potassium oxide concentration to higher values [267]. 8% K,O. 57 % K,O. 5 % SO,, remainder Fe,O,, is substantially more active than the conventional cobalt-free catalysts [251], [280].

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Ammonia: principles and industrial practice by Max Appl

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