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[en] Full text: In the article have been reviewed the measures on tubing string cleaning from asphalt-tar-paraffin sediments formed while oil boreholes exploitation. In order to solve these problems connected with cleaning from asphalt-tar-paraffin crystals and mechanical sediments has been developed a new mechanical device which has been tested in pipe cleaning workshop in OGPD named after N.Narimanov. Test results showed that besides cleaning the pipes from ATP crystals and other mechanic sedimentations the device also prevents roughness of the pipe from inner side and creates smoothness inside the pipe. As a result, sedimentation period of ATP crystals inside the pipe is reduced which leads to increase runtime period between overhaul periods for 1.5-2.0 times
Journal
Azerbajdzhanskoe Neftyanoe Khozyajstvo; ISSN 0365-8554; 
; v. 54(1); 1 p
; v. 54(1); 1 p
[en] In this work the experimental values of the coefficient are presented of sorption organic carbon, Koc, for fuel diesel of Mexican production which is a mixture of composed and whose value is not reported in the literature specialized, only for rank interval of sediments and soils. the coefficient of distribution, koc, of the majority of the organic compounds is increased with the fraction of organic carbon, foc implying that another option to obtain Kd is through the coefficient of sorption K, and foc by means of the relation K = foc the values of Kd were determined through isotherms adsorption, for which five types of different floors were tested, five concentrations of diesel in intermittent reactors and itself model the process with the equation of Freundlich considering n = 1 for the lineal adjustments. Values were obtained of Koc, in a rank from 44.82 to 55.62 ml/g. The analysis was carried out of variance and applied the test of multiple intervals of Duncan to determine the difference among the averages of the Koc obtained. Graphic the influence of the foc in the adsorption of the diesel was presented
Journal
Dyna (Medellin); ISSN 0012-7353; ; v. 74(153); p. 159-165
; v. 74(153); p. 159-165
[en] Full text: The article is devoted to the study of negative factors araising from oil fields' explotiation. It's analyzed the state of ecosystems in the prospecting, oil production, as well as oil and gas transportation areas. It has been determined that industrial and metal wastes cause seious harm to ecological balances at their burial ground disposal. during research into acid tar's utilization, and the waste of petrochemical production, effective inhibitors of metals' corrosion have been obtained
Journal
Chemical Problems; ISSN 2221-8688; ; v. 296(3); 4 p
; v. 296(3); 4 p
[en] Trace metal ions such as Cd2+, Ni2+, and Zn2+ in a highly saline sample were subjected to on-line complexation with 4-(2-thiazolylazo) resorcinol (TAR) dissolved in a background electrolyte (BGE) under transient isotachophoresis (TITP) conditions. A long plug of the saline sample, containing the trace metal ions but devoid of TAR, was injected into a coated capillary filled with a BGE composed of 150 mM 2-(cyclohexylamino) ethanesulfonic acid (CHES) and 110 mM triethylamine (TEA) at pH 9.7. Since the electrophoretic mobility of TAR fell between the mobilities of the anionic leading electrolyte (Cl- in the sample) and the anionic terminating background electrolyte (CHES-), a highly concentrated zone of TAR from the BGE was formed at the rear of the sample matrix and then the metal cations toward the cathode were swept by isotachophoretically assisted on-line complexation (IAOC) between the metal ions and the isotachophoretically stacked TAR. As a result, anionic metal-TAR complexes were formed efficiently, which satisfy the TITP conditions between Cl. and CHES-. The enrichment factors of metal ions including Cd2+ were up to 780-fold compared to a conventional CZE mode using absorbance detection. The detection limits were 17 nM, 15 nM, and 27 nM for Ni2+, Zn2+, and Cd2+ in a 250 mM NaCl matrix, respectively. Our method was successfully applied to the analysis of urine samples without desalting
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964; ; v. 33(3); p. 790-794
; v. 33(3); p. 790-794
[en] Highlights: • Coal tar is rich in abundant profitable chemical stocks. • Waste coal tar is upcycled into value-added products with catalytic activity. • Immature coal tar deep processing technology limits industrial chain extensions. • Phenolic and N-containing compounds can be used for synthesizing carbon materials. Coke resources are abundantly available worldwide and are a large by-product of tar production. Moreover, their utilization presents a series of environmental pollution problems. Common technologies for coal tar production applications urgently need to be upgraded because coal tar is listed as a national hazardous waste. This review associates coal tar development with deep processing technology for extracting environmentally beneficial compounds from coal tar, which have never been reported. Recent studies on the innovative approaches for extracting phenols and nitrogen-containing compounds from coal tar have been addressed, as well as a preparation method of carbon materials with high catalytic activity and a well-ordered structure by confined polymerization. Tremendous demand for further research and exploration of selectively extracted compounds from coal tar implies a new opportunity for polymerizing the resin and a great challenge for the current technology implemented for valorizing coal tar into ordered carbon materials. Consequently, more concerted efforts should be implemented to achieve a wide range of polymer resin applications and improve the quality of carbon precursors extracted from the coal tar, thus increasing the economic benefit and scientific value of coal tar.
Journal
[en] Woody biomass was gasified in steam at high temperature (∼923K) and pressure (∼6.5MPa) in the presence of a CO2 sorbent using a batch reactor with 50cm3 capacity; this process is termed ''in situ CO2 removal gasification.'' Gas, tar, and char were obtained as the products. The evolved CO2 was completely absorbed in the sorbent, and no CO2 was in gas phase. The product distribution at different reaction temperatures ranging from 473 to 923K was examined to obtain fundamental information on the biomass degradation during the gasification. The reaction model proposed by Shafizadih and Chin was applied. The kinetic constants of the primary and secondary degradations were calculated from the product distribution
Journal
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