Extracting lithium from waste solutions of chemico-metallurgical lithium carbonate production

In order to reduce the loss of lithium in waste solutions of chemico-metallurgical lithium carbonate production, it is suggested to extract lithium from these solutions in the form of poorly soluble hydroxodialuminate under the action of sodium and potassium aluminates. Technological tests showed that the proposed method ensures almost complete isolation of lithium from waste solutions of lithium carbonate production.     

Dulromabsorb sorbent for recovery of petroleum products from sites of accidental spills

The Mozambique sorbent of plant origin, DULROMABSORB, was investigated. Due to the high-tech oleophilic and hydrophobic properties, it can be used as an absorbing substance in eliminating accidental spills of crude oil and a broad spectrum of petroleum products on the surface of water and soil in a wide temperature range. The sorbent can be used in both disperse form and as a filler for oil-absorbing mats and blankets. The sorbent is highly competitive with respect to specialized sorbents for recovery of petroleum products and many potential natural and industrial sorbents. __________ Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 42–46, March–April, 2007.     

Optimization of the reforming process scheme

The possibility of obtaining stable reforming catalyzate with a benzene content of less than 1 wt. % was demonstrated by mathematical modeling. Two new versions of separation of benzene-forming components from the reaction mixture between the second and third levels were created. In comparison to the standard process, the first version ensures a benzene content in the reformate at the level of 0.01 wt. % with a 12% decreases in its yield, and the second version produces a benzene content at 0.47 wt. % with a 2.9% increase in the yield of reformate. The proposed versions are useful in production of export automotive gasoline that satisfies the Euro 2000 requirements. __________ Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 3, pp. 18 — 22, May — June, 2006.     

Coding system of Therapeutic Focus on Action and Insight.

This study (a) used an established comprehensive process measure to uncover a latent pattern of therapeutic focus in cognitive–behavioral and psychodynamic–interpersonal sessions; (b) used these results to develop the coding system of Therapeutic Focus on Action and Insight, which makes it possible to evaluate therapists' relative emphasis on the Constructing Meaning and Facilitating Action domains of in-session focus; and (c) evaluated its reliability and validity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A symbolic-numerical algorithm for the computation of matrix elements in the parametric eigenvalue problem

A symbolic-numerical algorithm for the computation of the matrix elements in the parametric eigenvalue problem to a prescribed accuracy is presented. A procedure for calculating the oblate angular spheroidal functions that depend on a parameter is discussed. This procedure also yields the corresponding eigenvalues and the matrix elements (integrals of the eigenfunctions multiplied by their derivatives with respect to the parameter). The efficiency of the algorithm is confirmed by the computation of the eigenvalues, eigenfunctions, and the matrix elements and by the comparison with the known data and the asymptotic expansions for small and large values of the parameter. The algorithm is implemented as a package of programs in Maple-Fortran and is used for the reduction of a singular two-dimensional boundary value problem for the elliptic second-order partial differential equation to a regular boundary value problem for a system of second-order ordinary differential equations using the Kantorovich method.     

Features of operation of a reaction-fractionation column. Different versions of the fractionation stage

A number of methods of implementing the fractionation stage in a reaction-fractionation column — from the version of a distillation column to a complete column with side takeoff of the target product and different versions of feedstock input (discrete and distributed) into the column — was analyzed by mathematical modeling of production of ethylene glycol. In operating the column in the total reflux mode, the quality of the residue obtained is almost independent of the number of theoretical plates between the feedstock input and residue takeoff zones. A region of constant concentrations in vapor and liquid streams is formed in the middle of the column. Distributed feedstock input does not save on power. Better fractionation results were obtained in using the complete reaction-fractionation column with side takeoff of the target product. __________ Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 6, pp. 12–19, November–December, 2007.