Absorption absorptive medium

The reaction products are chemicals that commonly occur in the hypochlorite solution, which is an advantage over using a sodium sulphite solution as an absorption medium, for example, as its use would entail removal of sulphuric impurities. 

Containers, media and seeds. Glass Petri dishes, 100 x 15 cm, were used with two sheets of 75-mm Whatman 41 filter paper as the absorptive medium. Ten seeds of TAM105 wheat were placed in a radial pattern with the micropyle end toward the center between the two sheets of filter paper. Seeds were hand-selected for normal size and absence of damage. TAM105 was selected because it is the variety used in the ongoing field research on conservation tillage practices. The bottom section of each Petri dish cover was covered with a square of kitchen-type plastic wrap to retard moisture loss before the lid was pressed on. 

Providing no other acidic species are present and water has been used as the absorption medium in either the 02 flask or pyrohydrolytic tube decomposition, the acidimetric titration of hydrogen fluoride is the simplest. Unfortunately this is often not the case, so one of the other finishes such as colorimetry and titrimetry has to be used. One of the best colorimetric procedures employs Ce-Alizarin complexone reagent5 which changes from wine red to dark blue in the presence of fluoride ion. The color takes a while to develop fully, but it is very reliable. 

ABSORPTION (Process). Absorption is commonly used in the process industries for separahng materials, notably a specific gas from a mixture of gases and in the production of solutions such as hydrochloric and sulfuric adds. Absorption operations are very important to many air pollution abatement systems where it is desired to remove a noxious gas, such as sulfur dioxide or hydrogen sulfide, from an effluent gas prior to releasing the material to the atmosphere. The absorption medium is a liquid in which (1) the gas to be removed, i.e., absorbed is soluble ill the liquid, or (2) a chemical reaction takes place between the gas and the absoibing liquid. In some instances a chemical reagent is added to the absorbing liquid to increase the ability of the solvent to absorb. 

Another chemical solvent process that was frequently used is the Giam-marco-Vetrocoke process in which a mixture of aqueous solutions of an alkali metal carbonate, an alkali metal arsenite, and an arsenate is used as the absorption medium. When correct proportions of arsenite to arsenate and pH... 

The first phase determined that the citrate system best met all of the critical requirements for an ideal sulfur dioxide absorption medium, including the system s capability for efficient removal of sulfur dioxide over a broad concentration range, e.g., the high levels in smelter waste gas, the sulfur dioxide-lean stack gas emitted by power plants, and the intermediate range represented by Claus plants. The results of the second phase of the program, dealing with the process chemistry, forms the basis for much of this paper. 

Absorbers with sintered glass make it possible to break up the sample into a large number of small bubbles released in the close vicinity of the moistened absorber bottom, thus providing the most efficient contact of a large number of bubbles of the air with the absorption medium. 

FaUanza M, Ortiz A, Goni D, and Ortiz I. Improving the mass transfer rate in G-L membrane contactors with ionic liquids as absorption medium. Recovery of propylene. J. Membr. Sci. 2011 385-386 217-225. 

These derivatives are exhibited in Fig. 2.17, which illustrates that the broad background disappears for the higher derivatives. If the absorptive medium is the same as the gain medium, the Lamb peak appears at the center of the gain profile (Fig. 2.16b, c). 

An absorber column is a device used to remove selected components from a gas stream by contacting the stream with a gas or liquid. A typical gas absorber is a plate distillation column or packed distillation column that ensures intimate contact between raw natural gas and an absorption medium. Absorption can roughly be compared to fractionation, although absorption columns work differently than typical fractionators because during the process the vapor and liquid do not vaporize to any degree. 

Sulphur trioxide is absorbed in the intermediate absorber and in the final absorber. The former absorbs SO 3 from the third catalyst bed and the latter from the first bed. If water is used for absorption a fine acid mist forms which is unacceptable in practical or environmental terms. In order to prevent this the vapour pressure above the acid must be made sufficiently low. This can only be achieved if the absorption medium is greater than 97% strength sulphuric acid—in practice 98% sulphuric acid is employed. The final product is about 98.5% sulphuric acid, which is then diluted to 98% with water in the pump tanks. The heat formed in the reaction... 

In an absorptive medium, the elements of the Mueller scattering matrix (Eq. 43) depend on the radial distance from the particle and can not be directly related to the scattering cross-section as given above (Eq. 44). In this case the different elements of the matrix are used individually in the analysis of scattering phenomena. In practice, their values are normalized by the total scattered rate aroimd the particle at the radiation zone, which can be derived from the integral of Pn for all scattering angles. 

In an absorptive medium, the rate of energy incident on the particle depends on the position and intensity of the wave souree, the optical properties of the host medium, and the partiele size parameter and shape. For spherical particles, following Mundy et al. [41], if the intensity of the incident light at the center of the computational domain... 

The extinction efficiency Qe), absorption efficiency (go) and anisotropy factor (g) for a cell embedded in an absorptive medium (the same as in Figure 7) are listed in Table 2. 

The permeation breakthrough time is defined under specific laboratory conditions. A CPC sample is mounted in a test cell between two compartments (see Figure 4). One compartment contains the test chemical an absorption medium (usually gas or liquid) is led to flow through the other compartment to collect any permeated substance. A detection device is connected to the second compartment, which is monitored for the concentration of the chemical over time, continuously monitoring the permeation rate of any chemical seeping through. 

Chromatography was defined by Tswett (1906) as a procedure for separating dyes based on repeated adsorption and desorption in successive layers of some absorption medium. Later the term has been applied to all techniques of separation in which a selective process is repeated a great number of times on carrier material. Minute differences in properties are thus magnified for effective separation. 

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