KOSEN 한인과학기술자네트워크

다음의 자료는 LG상남도서관(http://www.lg.or.kr)을 통해 원문다운이 가능한 자료들입니다. 참고하시기 바랍니다. * REMOVAL OF SELENOCYANATE IN WATER BY PRECIPITATION - CHARACTERIZATION OF COPPER-SELENIUM PRECIPITATE BY X-RAY DIFFRACTION, INFRARED, AND X-RAY ABSORPTION SPECTROSCOPY , Manceau A, Gallup DL, Environmental Science & Technology , V.31 N.4 , , 19970401 초록 During refining of sour crude oils produced from reservoirs containing seleniferous marine shales, selenium is concentrated into process waters and wastewaters. Selenium, present in the waters as selenocyanate, must be removed to meet regulatory discharge limits. Treatment of wastewaters with copper(ll) salts effectively precipitates selenium. An objective of the present study was to determine whether selenium was precipitated as elemental Se or immobilized in the form of cyanate complexes or any other form that remains to be identified. The precipitate had a Se/(Se+S) mole ratio of 0.09. The incorporation of selenium in the copper thiocyanate lattice was proven by X-ray diffraction. The presence of native selenium was disallowed by Se K-edge X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy. Selenium was shown by EXAFS to be present as selenide and surrounded by one nearest C atom and three next-nearest Cu atoms. This local environment is typ cal of the copper thiocyanate structure, which proves that Se substitutes for S on the atomic scale. Based on results of chemical analyses and structural methods, it is concluded that the sludge consists primarily of an alpha-Cu(So(0.91)Se(0.09))CN solid solution. Some copper is not reduced and is liganded to O, OH, or H2O. These results indicate that, when added to process water, cupric ions are reduced by sodium thiosulfate and sulfites initially present in the solution to yield primarily cuprous thiocyanate/selenocyanate. 아래의 자료는 산업기술정보원(KINITI)를 통해 검색된 자료입니다. 원하시는 자료는 산업기술정보원의 웹사이트(http://www.kiniti.re.kr)을 통해 원문신청하시기 바랍니다. 아래의 자료 이외에 crude oil sludge에 관련된 자료가 KINITI의 해외DB검색을 통해 약 80여건이 검색되어 나옵니다. 직접 방문하시어 검색해 보시는 것 또한 도움이 되실 듯 합니다. * BETTER WAYS TO CLEAN CRUDE STORAGE TANKS AND DESALTERS., Barnett, J. W., Hydrocarbon Processing v 60 n 1, p 82-86, 1980 Abstract : This paper describes new developed programs for cleaning crude unit desalters and oil storage tanks. They reduce the time required to remove sludge build-up in these vessels. The programs reduce worker exposure to safety hazards, recover large amounts of crude oil (particularly storage tank cleaning) and >원유저장 탱크 및 보관시설내에 침전하는 sludge 제거 기술 및 >처리 방안에 대한 정보를 부탑합니다. > >E-mail : worldchon@hanmail.net