Reference

Change in vanadium content in the refining of Samotlor petroleum

Change in vanadium content in the refining of Samotlor petroleum. Luzyanina, L. I.; Morgen, E. A.; Zemlyanichkin, A. F. (INUS, USSR). Neftepererab. Neftekhim. (Moscow), (4), 7-8 (Russian) 1984. CODEN: NNNSAF. ISSN: 0028-1190. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) The 3 stages in the dewatering-desalting of Samotlor crude decrease cumulatively its content of V from 0.0225 mg/g to 0.0192, 0.0178, and 0.0174 mg/g, resp. An anal. procedure (color reaction of V compds. with Chrome Azurol S [1667-99-8] in the presence of diphenylguanidine [102-06-7]) demonstrated that V4+ is removed more effectively from petroleum during desalting than V5+.

Determination of trace amounts of iron in lubricating oils

Determination of trace amounts of iron in lubricating oils. Chen, Shanghuai (Chengdu Petrochem. Plant, Chengdu, Peop. Rep. China). Runhua Yu Mifeng, (3), 34-5 (Chinese) 1983. CODEN: RYMID2. ISSN: 0254-0150. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) Section cross-reference(s): 80 The Fe concn. in a lubricating oil was detd. spectrometrically by forming a chelate with Chromazurine S (I) [1667-99-8] and cetyltrimethylammonium bromide (II) [57-09-0]. The oil sample (~5 g) was ashed, mixed with 10 mL 50% HCl, heated, remixed with 30 mL water, boiled, and filtered. Then the filtrate 0.5-2 was mixed with H2O2 2, aq. I 5, EtOH soln. of II 2, a buffer soln. 2 mL, and appropriate amt. of tap water to give a mixed soln. for the anal. For samples contg. 74-1224 ppm Fe, the detn. error was <10%.