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Separation rate

IS general for nucleophilic acyl substitution and well worth remembering The range of reactivities is quite large a factor of about 10 m relative rate separates acyl chlorides from amides... [Pg.834]

Bubble caps at outlet side blowing liquid into downcomer limiting capacity. At high rates, separation was reduced as in entrainment. Calculations indicated this should not happen. Scan indicated problem. Debottlenecking activity. [Pg.300]

The particles most likely to cause adverse health effects are the fine particulates, in particular, particles smaller than 10 p and 2.5 mm in aerodynamic diameter, respectively. They are sampled using (a) a high-volume sampler with a size-selective inlet using a quartz filter or (b) a dichotomous sampler that operates at a slower flow rate, separating on a Teflon filter particles smaller than 2.5 mm and sizes between 2.5 mm and 10 mm. No generally accepted conversion method exists between TSP and PM,o, which may constitute between 40% and 70% of TSP. In 1987, the USEPA switched its air quality standards from TSP to PMk,. PM,q standards have also been adopted in, for example, Brazil, Japan, and the Philippines. In light of the emerging evidence on the health impacts of fine particulates, the USEPA has proposed that U.S. ambient standards for airborne particulates be defined in terms of fine particulate matter. [Pg.16]

X. Sun, D. Luo, J. Liu, D.G. Evans, Monodisperse chemically modified graphene obtained by density gradient ultracentrifugal rate separation, ACS Nano, 4 (2010) 3381-3389. [Pg.39]

Convective Flux Rates. We will deal with the convective and diffusive flux rates separately. They will eventually be separated in the final diffusion equation, and it is convenient to make that break now. The x-component of the convective flux rate is equal to the x-component of velocity, u, times the concentration, C, times the area of our box normal to the x-axis. Therefore, in terms of convective flux rates, equation (2.9a) becomes... [Pg.22]

Because of continuing problems with wash tanks as water separation equipment, a commitment was made to design a high-rate separator based on the API model separator. The primary design criterion was its effectiveness at rates of more than 25.000 B/D (3975 m3/d). Secondary criteria were ease of construction, durability, and low capital costs. [Pg.205]

A.D. Isaacson, D.G. Truhlar, Polyatomic canonical variational theory for chemical reaction rates. Separable-mode formalism with application to OH+I-p H2O+H, J. Chem. Phys. 76 (1982) 1380. [Pg.160]

WM lesions are rated separately in four WM areas periventricular, deep, watershed, and subcortical WM. By definition, periventricular WM foci have to be in contact with the ventricular wall, deep WM foci separated from the ventricles by a strip of normal-appearing WM and located outside watershed regions. Watershed regions are the areas located between the territories of two of the main cerebral arteries, like middle cerebral artery and anterior cerebral artery or middle cerebral artery and posterior cerebral artery. The subcortical... [Pg.153]

Removal of suspended solids from a liquid may be required, either to recover valuable products or to remove obnoxious particulates. Clarification of dilute aqueous suspensions is frequently performed in deep-bed granular filters, where the grains provide a surface on which the particles may adsorb. If two types of particles differ in their adsorption rate, separation of them may be accomplished by selectively adsorbing one species on the grains. Furthermore, reversibility of adsorption would... [Pg.84]

Gas chromatography is a very sensitive technique requiring only very small amounts of sample (lO g). A solution of about 1% is sufficient and a few microlitres of this is injected into a heated injector block. A stream of carrier gas, usually helium, passes through the injector and sweeps the vapours produced onto the column, which is contained in an oven. The temperature of the oven can be accurately controlled and can either be kept constant or increased at a specified rate. Separation of the components in gc is not based on the principle of adsorption, as it is in liquid chromatography, but on partition. A gc column is rather like an extremely effective distillation column with the relative volatility of the components being the main factor which determines how quickly they travel through the column. [Pg.156]

Starting with the description of the main components of a chromatographic unit, this chapter gives an overview of process concepts available for preparative chromatography. The introduction is followed by some guidelines to enable a reasonable choice of the concept, depending on the production rate, separation complexity and other aspects. [Pg.173]

A chemical warehouse may contain multiple uses or occupancies that should be evaluated separately for means of egress design. Personnel facilities (offices, breakrooms, lavatories, etc.) should not be located in the same fire area as warehouse operations. At least a one-hour fire-rated separation between warehouse and non-storage areas should be provided a greater fire rating could be required. [Pg.71]

Table 6-6 provides an example of one insurance carrier s classification method and terminology for fire separation walls. This example demonstrates the range of required fire-rated separations. These categories relate to the ability and the length of time each can withstand a standardized fire exposure, the capacity to maintain continuity and stability during periods of prolonged and excessive heat, and the physical forces which occur to each during a fire (such as collapse). [Pg.89]

Hour One 1-hour door for fire-rated separations enclosing shafts, or one 45-minute door for other walls. ... [Pg.94]

ICP-MS HPLC HPLC-tubing-nebulizer-spray chamber-torch-IGP-MS [ig element P e.g., 0.4 tg butyltin in water 0.8 tg kg Se species in yeast Commercial systems available organic solvent introduction can require chilled spray chamber and addition of oxygen a total consumption interface for low flow rate separations using capillary columns has been reported non-volatile compounds determined without derivatization 85,437... [Pg.623]

What are the implications of this for NMR measurements In order to measure NMR parameters (represented by a frequency or rate) separately for each state (i.e., free and boimd state), the state s lifetime has to be significantly longer than the inverse of the differences of this parameter in the two states (corresponding to the intermediate... [Pg.140]

The very coarse particles, from gravel upward, are fragmented rocks and are usually highly variable in shape. They may be irregularly shaped, more or less rounded, or even flat. Fragmented rocks are usually a minor constituent and rated separately in soil because of their size. [Pg.223]

With an increasing molecular weight of PEO acid, the separation factor for the water/ethanol selectivity increased, but the permeation rate almost did not change. The permeation rate, separation factor for the water/ethanol selectivity, and the evapomeation index of the q-Chito-PEO acid 400 polyion complex/PES composite membrane with an equimolar ratio of carboxylate groups in PEO... [Pg.494]


See other pages where Separation rate is mentioned: [Pg.14]    [Pg.834]    [Pg.2]    [Pg.34]    [Pg.202]    [Pg.841]    [Pg.146]    [Pg.154]    [Pg.90]    [Pg.223]    [Pg.202]    [Pg.339]    [Pg.112]    [Pg.68]    [Pg.902]    [Pg.139]    [Pg.155]    [Pg.417]    [Pg.89]    [Pg.92]    [Pg.684]    [Pg.827]    [Pg.244]    [Pg.257]    [Pg.883]    [Pg.815]    [Pg.192]    [Pg.133]    [Pg.204]    [Pg.502]   
See also in sourсe #XX -- [ Pg.517 ]




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Mass-transfer rates in chromatographic separations

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Rate of separation and residence times

Rate of the separation

Rate-energy leveling, photoinduced charge separation

Rates, free-solution separations

Reactions with separable rates

Sample separable rate

Separable rate

Separable rate

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