Nitrogen content basic

Because the heavy ethyleneamines are very complex materials, assays by titration in aqueous and nonaqueous media are often performed (151). The result is usually expressed as an amine number or amine value, a measure of the total basic nitrogen content of the product. Titrimetric procedures are also available to define primary, secondary, and tertiary amine content (152). 

UOP Test Method 313 is commonly employed to determine the basic nitrogen content of FCC feed. The feed sample is first mixed 50/50 with acetic acid. The mixture is then titrated with perchloric acid. 

Arens, M., M. Hirschen, H. Klotz, Potentiometric titration of total basic nitrogen content of surfactants—German standard methods for analysis of fats, fatty products, surfactants, and related materials analysis of surface active materials XXXI (in German), FettILipid, 1997, 99, 369-371. 

Because the basic-oxygen process uses a refining agent containing practically no nitrogen, the product has a low nitrogen content. Oxygen residues depend on the carbon content. 

New aluminophosphate oxynitrides solid basic catalysts have been synthesised by activation under ammonia of an AIPO4 precursor. When the nitrogen content increases, XPS points out two types of nitrogen phosphorus bonding. The conversions in Knoevenagel condensation are related to the surface nitrogen content. Platinum supported on aluminophosphate oxynitride is an active catalyst for isobutane dehydrogenation. 

Carbazole is a non-basic nitrogen compound, whose removal via hydrotreating is limited by its low reactivity. The removal of nitrogen by hydrotreatment involves a number of steps that take place on the catalyst surface. The weak interaction of neutral nitrogen compounds with catalysts precludes carbazole and its derivatives from being denitro-genated and makes them the most recalcitrant components in HDN of gas oils [308], In fact, it has been found that the nitrogen content of hydrotreated gas oil from Athabasca bitumen was composed primarily of alkyl carbazoles [309],... 

The composition of crude oil may vary with the location and age of an oil field, and may even be depth dependent within an individual well or reservoir. Crudes are commonly classified according to their respective distillation residue, which reflects the relative contents of three basic hydrocarbon structural types paraffins, naphthenes, and aromatics. About 85% of all crude oils can be classified as either asphalt based, paraffin based, or mixed based. Asphalt-based crudes contain little paraffin wax and an asphaltic residue (predominantly condensed aromatics). Sulfur, oxygen, and nitrogen contents are often relatively higher in asphalt-based crude in comparison with paraffin-based crudes, which contain little to no asphaltic materials. Mixed-based crude contains considerable amounts of both wax and asphalt. Representative crude oils and their respective composition in respect to paraffins, naphthenes, and aromatics are shown in Figure 4.1. 

The nitrogen content of proteins is usually accepted as 16% of the total weight but this may not always be correct as values for individual proteins do differ. This is particularly true if the protein has either a high proportion of basic amino acids (additional nitrogen atoms) or is a conjugated protein with an appreciable non-protein component (Table 11.1). 

Aniszewski, T., Ciesiolka, D. and Gulewicz, K. 2001. Equilibrium between basic nitrogen compounds in lupin seeds with differentiated alkaloid content. Phytochemistry, 57 43-50. 

On nitrided aluminophosphates, AlPON, Massinon et al. [206] observed on a series of six samples with increasing nitrogen contents a good correlation between the catalytic activity in the Knoevenagel condensation reaction and the amount of surface NH, species (1 < x < 4) quantified by the Kjeldahl method. The authors suggest that those species are not the only active species and evoke an additional role of the nitride ions in the reaction [206] on the other hand, Benitez et al. [207] suggest hydroxyls linked to aluminum cations in the vicinity of terminal P-NH2 groups as basic centers. 

The strength of the basic sites also increases with the total nitrogen content the initial adsorption heats rise from 83 kJ/mol on the least nitrided sample to 142 kJ/mol for the most nitrided sample. 

O.E. Sheffield, Long Range Basic Research Leading to the Development of Ideal Propedants. Compounds of High Nitrogen Content in Propellant Powders, PATR 1694 (May 1948) 3)... 

Nitrogen Content is detd by Titanous Chloride Method in the same manner as described under Basic Lead Styphnate, Test 10... 

The relationship between pH, mineral retention, and basic cheese structure has been illustrated by Lawrence et aL (1984). Hill et al. (1985) have developed mathematical models of the association between pH at draining and mineral content of whey. The calcium, phosphorus, magnesium, and nonprotein nitrogen content of whey increased with decreasing pH, while sodium and potassium levels were not affected. Mineral and nonprotein nitrogen concentrations in the whey were not associated with cooking temperature. 

Freshwater sediments Heavy metals Hg, Pb, Cu, Ni, Zn, Mn, Fe, Cd TOC Humus compound content Sulfur and nitrogen content PAH TOC V. fischeri Microtox Basic Solid-phase Test, Microtox Acute Toxicity Basic Test) V. fischeri Daphnia magna... 

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