Catalytic gasoline extraction hydrogenation combined desulfurization and selective olefin reduction technology (EH-DSO)

Hebei Refining Technologies Co., Ltd. has been a trailblazer in clean energy solutions

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wangjingfeng@hbreftech.com

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Nov 20,2018

Catalytic gasoline extraction, hydrogenation, combined desulfurization and selective olefin reduction technology (EH-DSO)

Catalytic gasoline is rich in olefins and high in sulfur. When using traditional selective hydrogenation technology for desulfurization, it is inevitable that olefin saturation and octane loss will occur. Based on in-depth research on the hydrocarbon composition and sulfur distribution of catalytic gasoline, our company pioneered the process idea of extraction hydrogenation combined desulfurization, and successfully developed the first industrial application unit. This technology is superior to the traditional selective hydrogenation technology in terms of investment, energy consumption, hydrogen consumption, and octane loss; the higher the sulfur content of catalytic gasoline, the more significant the advantage. This technology has passed technical appraisal and reached the world's advanced level, winning the first prize of technological invention in the petroleum and petrochemical industry and the second prize of national technological invention; the current application achievements have reached 15 sets. This technology has gone global and has been selected by Shell Refining Company in Malaysia, and has reached an overseas promotion cooperation agreement with Ineos Technologies, a subsidiary of Koch Group in the United States. Several projects in Mexico, Argentina, and Australia are currently underway. For non-ethanol gasoline production enterprises, the catalytic gasoline is divided into light, medium, and heavy components. After desulfurization, the light component undergoes etherification to reduce olefins. The middle distillate is extracted to prevent olefin hydrogenation saturation from causing excessive octane loss, and the remaining heavy components are sent to selective hydrogenation; when the sulfur content of catalytic gasoline is reduced to below 10ppm, and olefins are reduced by 8 percentage points (including etherification reduction), the octane loss of the whole distillate gasoline will be within 1.0, which meets the requirements of the National VI upgrade to further reduce olefins without reducing octane number. For ethanol gasoline production enterprises without etherification and olefin reduction, selective olefin reduction needs to be particularly emphasized. The catalytic gasoline is divided into light, medium, and heavy components. The middle component undergoes extraction desulfurization, and the light component is used for back-extraction to extract cycloolefins, small-molecule isomeric olefins and aromatics, and sulfides with low RON loss after hydrogenation saturation from the gasoline fraction, which are then sent for hydrogenation desulfurization and olefin reduction together with the heavy components. The proportion of catalytic gasoline that needs to be hydrogenated and desulfurized is reduced from 80～100% to about 40%. When the sulfur content of catalytic gasoline is reduced to below 10ppm, and olefins are reduced by 8 percentage points, the octane loss of the whole distillate gasoline will be within 1.5, which meets the requirements of the National VI upgrade to further reduce olefins without reducing octane number. After our company's extraction hydrogenation combined desulfurization technology has been successfully applied to three sets, other companies have launched extraction hydrogenation combined desulfurization technologies similar to ours. The difference is that our company uses liquid-liquid extraction for extraction, while other companies use extractive distillation. Facts have proved that: under the same scale, the investment and land occupation of liquid-liquid extraction or extractive distillation are similar; extractive distillation consumes one-third more energy than liquid-liquid extraction; extractive distillation does not have the function of selective olefin reduction, and for those who need olefin reduction, the octane loss will be larger; extractive distillation desulfurization is highly dependent on the reliability of the pre-hydrogenation conversion of small-molecule mercaptans. For example, Haikuerilin uses GTC extractive distillation desulfurization. During operation, the performance of the pre-hydrogenation catalyst deteriorates, leading to high sulfur content in light gasoline and being forced to increase the hydrogenation ratio, resulting in a significant increase in octane loss; the same situation of pre-hydrogenation performance deterioration also occurred in Yatong. Yatong uses our company's liquid-liquid desulfurization, and Yatong presses light gasoline into medium gasoline. After extraction and desulfurization of light and medium gasoline, it is still less than 10ppm, and no increase in octane loss has been caused. In summary, our technology is superior to extractive distillation desulfurization in both adaptability and economy.

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Since its founding in 1996, Hebei Refining Technologies Co., Ltd. (HRT) has been a trailblazer in clean energy solutions, headquartered in Cangzhou High-Tech Zone, Hebei Province, China.

Service Hotline:

+8618031723295

wangjingfeng@hbreftech.com

South of Linhai Road, West of Xinglin Street, Cangzhou High-Tech Zone, Hebei, China

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