Absorbers selection

The phenomenon of multiphoton dissociation finds a possible application in the separation of isotopes. For this purpose it is not only the high power of the laser that is important but the fact that it is highly monochromatic. This latter property makes it possible, in favourable circumstances, for the laser radiation to be absorbed selectively by a single isotopic molecular species. This species is then selectively dissociated resulting in isotopic enrichment both in the dissociation products and in the undissociated material. 

To select correct size tails tower and cooler absorber, to meet your specific requirements, follow the dotted line in the two charts. For example, using a 75% concentration of feed gas, 90 cooling water, and absorbing 2,000 Ibs./hr. HCI,- a 92 tube cooler absorber would be required in con unction with a 24" diameter tower. To produce acid over 20 Be to 22 Be, use 12-foot long tubes in ail instances where cooling water temperature falls to left of black dotted line in cooler absorber selection chart. Use 9-foot long tubes where temperature point is to the right of the dotted line. 

Orsat analyzer analy chem Gas analysis apparatus in which various gases are absorbed selectively (volumetric basis) by passing them through a series of preselected solvents. 6r,sat an-3,lTz-or ... 

EXAFS has been very useful in the study of catalysts, especially in investigating the nature of metal clusters on surfaces of the supported metal catalysts (Kulkarni et al, 1989 Sinfelt et al, 1984). A variety of systems has been examined already and there is still considerable scope for investigation in this area. Since EXAFS gives bond distances and coordination numbers and is absorber-selective, it is possible to study one metal at a time (Fig. 2.12). Thus, an EXAFS investigation of sulphided Co—Mo— Al20j and related catalysts has shown the nature of the reactive surface species (Kulkarni Rao, 1991). Cu/ZnO catalysts have revealed certain unusual features suggesting the complex nature of the species involved in methanol synthesis (Arunarkavalli et al, 1993). Time-resolved EXAFS is of considerable value for the study of catalysts (Sankar et al, 1992). 

CPI Allied (Vulcan CfnctitiuirfA which uses roonoethanolamine to absorb selectively the CO2 contained in the gaseous effluent produced by the decomposition of the carba< mate and thus only recycles the ammonia. 

Acetals from aldehydes or ketones and secondary alcohols. The synthesis of ketone di-rcc-alkyl acetals ordinarily proceeds in low yield. Roelofsen and van Bekkum report that such acetals can be prepared in 70 90% yield by use of type 5A molecular sieves to absorb selectively the water formed. p-Toluenesulfonic acid is used as the acid catalyst. 

As an example, consider the logic condition if the absorber is selected or the membrane separator is selected, then do not use cryogenic separation. Assigning the Boolean literals to each action — select absorber, = select membrane separator, Pqs = select cryogenic separation, the logic expression is given by... 

According to the rule of ultra-violet absorbers selection the most effective stabilizers must absorb not only in the field of absorption of polymer itself, but in the field of its luminescence [24] that is the condition for realization of suppression mechanism of polymer excited state. 

A rapid loss of d-limonene, from 70 to 40 ppm for orange juice was observed in the 1 liter carton packs during the first days of ambient (25°C) storage (Fig. 4). Similar results were obtained by others (11,12) who claimed absorption by the film as the cause for this phenomenon. Again, the loss may vary between packages as shown in Fig. 5 The loss of d-limonene can be compensated for by increasing the initial d-limonene concentration. However, as d-limonene is a precursor to oxidative reactions of flavour compounds and since some flavour compounds are absorbed selectively at a higher rate, this is not desirable. 

The gas sample is passed through a solution of an absorbent selective for one gas in a mixture, and the volume decrease is determined. 

Among the few molecules known to be absorbed selectively by tumor cells is the antitumor antibiotic bleomycin the structure of which is por-... 

The cooled gas from the top of the quench tower enters the SCOT absorber where the hydrogen sulfide is absorbed selectively by an... 

The extractive distillation column has always two feeds the entrainer is sent to the upper position, few stages below the top, eventually slightly sub-cooled, while he mixture is fed in the lower position. The entrainer flows downwards in counter-current with the vapour, absorbing selectively the component that will leave in bottoms. 

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