Ammonia: principles and industrial practice - download pdf or read online

By Max Appl

ISBN-10: 3527295933

ISBN-13: 9783527295937

Ammonia is among the most crucial inorganic easy chemical compounds, not just for the manufacture of fertilizers (85%) but in addition for the construction of plastics, fibers, explosives, and intermediates for dyes and prescription drugs. it truly is an important response part for the synthesis of various natural chemical substances used as solvents and intermediates. The ebook presents a realistic and up to date account of the product homes, synthesis and response mechanisms, together with catalysis and advertisement catalysts, sleek creation know-how for various feedstocks, caliber requirements and environmental well-being and safeguard elements, makes use of and monetary facts of this crucial commodity chemical. It additionally discusses views of destiny advancements of industrial ammonia creation. Over 1400 references to the proper literature whole this concise presentation, whose objective is to notify the reader of the current prestige of the idea and perform of commercial ammonia construction. Chemical engineers, engineers and chemists in undefined, engineering businesses, catalyst brands, gear makers and chemical engineering collage departments will surely take advantage of this complete evaluate according to the author's lengthy sensible event in a number one technical administration place of 1 of the biggest ecu ammonia manufacturers.

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Extra info for Ammonia: principles and industrial practice

Example text

M 2) In al 5E VJ aJ 5 c 0 - In 3) Y I d E aJ $ U E J LL 4) 5) the same approach to equilibrium, or the pressure may be reduced to 15 MPa (compare Tables 9 and 10). 2). 3), it must be kept in mind that the effect of poisons, for example, oxygen compounds, may become more severe as temperature declines (see Fig. 25). 5). In older high-pressure plants (60- 100 MPa), catalyst life was a big issue; because the catalysts in these plants showed a markedly reduced life owing to the severe operating conditions, the necessary downtime for removing, replacing, and reducing the catalyst had a considerable effect on the ammonia manufacturing cost.

The explanation is based on an electrostatic model 11071, 11421, 13061. As indicated by the strong decrease in the work function upon potassium adsorption, there is a considerable electronic charge transfer to the substrate, which creates a M’- - K’+ dipole. A nitrogen molecule adsorbed near such a site will experience a more pronounced back-bonding effect from the metal to its antibonding TC orbitals. This will increase the bond strength to the metal and further weaken the N - N bond, as can be seen from a further reduction of the N -N stretching frequency [3071.

The applicability of a particular equation resulting from this concept also depends on the state of reduction of the catalyst [1941 and the type of promoter 11971. 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].

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Ammonia: principles and industrial practice by Max Appl


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