Alkaline water solutions

The UV spectrum of H2NO" shows an absorption maximum at 217 nm in alkaline water solution this radical is unstable and decays by either dimerisation/cleavage or reaction with other species, with rate constants in the 10 -10 s range. Whereas... 

Chiral N-Oxides 250) In the reaction of N-benzyl-N-methylamino amino acids with H202 in alkaline water solution, mixtures of diastereomeric N-oxides, containing new centers of chirality on nitrogen atoms, were obtained. The reaction was performed with the corresponding derivatives of (S)- [or (R)] alanine, (S)- [or (R)] leucine, (S)-[or (R)] phenylalanine, and (S)- [or (R)] proline, respectively. In the reaction a distinct stereoselectivity could be observed for alanine, leucine, and phenylalanine derivatives the formation of N(S)C(S), or correspondingly N C, diastereomer is favoured. The reaction of (S)-proline derivatives leads, however, exclusively to the N(R,C(S) stereoisomer (252) on the other hand, (R)-proline yielded stereoselectively the compound (253). 

DORESCO AKW6-8 is an ammoniacal water solution of a soya oil alkyd resin. The alkyd is not completely esterifled so that it is suspendible in alkaline water solution however, it is sufficiently esterified so that it will cure with melamine resin and other cross linking resins. This resin solution should be stirred before use to achieve uniformity. 

There are at least three possible ways to carry out alcohol oxidations into carbonyl compounds by oxygen in the liquid phase The first is oxidation in non-aqueous solutions according to free radical mechanism But usually aldehydes (ketones) formed are much more easily oxidizable than alcohols and oxidation selectivity is not high enough. The second is oxidation in alkaline water solutions But in alkaline solutions aldehydes may transform into compounds with higher molecular mass And the third is oxidation in acidic water solutions. This way seems to be free of complications mentioned above The only problem is the selection of an adequate catalytic system... 

Main-chain aromatic polysulfonates are disclosed in numerous patents. As in the case of the polyamides, they are mostly prepared by a two-phase polycondensation using an aromatic disulfonyl chloride in a chlorocarbon solvent on the one hand, and an alkaline water solution of a diphenol on the other. The most commonly used diphenol is the industrially available Bisphenol A, in conjunction with aromatic disulfonyl chlorides. Typical cases are reported by Thomson and Ehlers82, e.g. 

Sour gases absorption in alkaline water solutions,... 

If the oil is particularly acid, an alkaline water solution can be the answer to easy emulsification. Flowever, the stability problem will have to be considered separately. In effect the activated natural surfactant would be able to produce an extremely stable emulsion. 

This gaseous stream is conventionally treated in a gas-cleaning unit based on physical scrubbing of the polar and ionizable pollutant (i.e., organic mist and SO3) by means of a dedicated electrostatic precipitator (ESP), whereas the SOj is scrubbed off by chemical reaction with an alkaline water solution countercurrently contacted with the gas stream. 

Hydrogen peroxide or superoxide form a paramagnetic complex in the reaction with chro-mium(VI) oxide in an alkaline water solution at room temperature (Lagercrantz 1999). The complex [Cr(0H)s02] with the g-value equal to 1.9734 is believed to contain hydroxyl groups derived from the alkaline solution and dioxygen derived from H2O2 or O2. ... 

Ammonium vanadate, a white crystalline powder, is precipitated from the alkaline water solution, and now in quantities large enough for further investigations of the goddess Vanadis metal... 

The chemistry of tungsten is complex. The metal has different oxidation states in compounds, the most usual being +6. The yellow oxide WO, is an important example. In alkaline water solutions the hexavalent element is present as tungstate ion... 

Polymers like sodium polyacrylate, used at concentrations around 1% and dissolved as alkaline water solutions [14]. 

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