High-calcium oil extraction processed by Sanju Environmental Protection’s MCT technology through calibration

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This post was last edited by liaifeng on 2018-9-3 at 17:53. (300072) Sanju Environmental Protection: Announcement – Regarding the calibration of the industrial demonstration unit for super suspended-bed hydrogenation (MCT) in processing Xinjiang’s naphthenic high-calcium heavy oil. In January 2017, Beijing Sanju Environmental Protection New Materials Co., Ltd. (hereinafter referred to as “the Company”) collaborated with CNPC Karamay Petrochemical Co., Ltd., Beijing Huashi United Energy Technology Development Co., Ltd., Fujian Sanju Fuda Fertilizer Catalyst Engineering Research Center Co., Ltd., and Hebi Huashi United Energy Technology Co., Ltd. to complete the world’s first calibration of a super suspended-bed hydrogenation (MCT) unit for processing petroleum-based high-calcium heavy oil. This process confirmed the unique advantages of the MCT suspended bed in processing residual oils with high metal content and high carbon residue levels. It also led to new insights and technical expertise regarding the use of this suspended-bed technology for such types of oils, laying a technical foundation for the construction of industrial plants with capacities of millions of tons or more. The average calcium content in Xinjiang’s naphthenic heavy oil at atmospheric pressure is 516 ppm; its carbon residue content is 10.1%; over 60% of the oil has a temperature threshold above 500°C; the average nitrogen content is 3300 ppm, while the sulfur content is 2300 ppm. Its viscosity at 100°C is 1388 mPa·s, and its acid value is 4.13 mgKOH/g. It is truly a type of oil with high viscosity, high metal content, high acid value, and difficulty in processing. Processing of Xinjiang’s naphthenic high-calcium heavy oil began on December 17, 2016, with qualified products being produced on December 18 of the same year. After entering a stable phase, the unit began a 72-hour calibration process at 8:00 on December 30, 2016, which was completed at 8:00 on January 2, 2017. By January 14, 2017, all 3600 tons of high-calcium heavy oil had been processed. During this period, the control of various key units in the suspended bed remained stable, and no issues such as coking, wear, or blockages occurred in the reactor. The metal content, including calcium, in the feedstock supplied to the fixed bed met the requirements specified for the catalysts used in the hydrocracking stage. The conversion rate and yield of light oil were both better than those achieved using conventional residual oil processing methods. This demonstrated the high conversion efficiency (94.21%) of the suspended bed under harsh operating conditions, as well as a high yield of light oil across the entire system (suspended bed + fixed bed, 89.01%). The quality of the main liquid products obtained during the calibration period was as follows: For naphtha products, the density at 20°C was less than 735 kg/m³; the final boiling point was less than 170°C; the content of alkanes and naphthenes was greater than 93% (by volume); the olefin content was less than 1.94% (by volume); and the sulfur content was less than 8 ppm. These were high-quality naphtha products. As for diesel products, their density at 20°C was 835 kg/m³; the cetane number was greater than 50; the freezing point was -10°C; the sulfur content was less than 5 ppm; the aromatic content was less than 2% (by mass); and the 95% recovery temperature was less than 364°C. These were high-quality diesel fuels meeting national V standards. In the future, the company will develop optimized processing solutions using the super suspended bed technology, taking into account the characteristics of high-calcium heavy oil residues, in order to maximize efficiency and integrate these solutions effectively into refinery processes for comprehensive optimization.