EXTRACTION PURIFICATION OF HEAVY FRACTION OF VISBREAKING GAS OIL BY MIXTURES OF N,N-DIMETHYLFORMAMIDE WITH N-METHYLMORPHOLINONE-3 AND LIGHT FRACTION OF N,N – DIMETHYLFORMAMIDE

Bulletin of the Saint Petersburg State Institute of Technology (Technical University) Pub Date : 2023-01-01 DOI:10.36807/1998-9849-2023-65-91-16-22

A. V. Kameshkov, A. A. Gaile, Maria Ahmad, P. Y. Bashmakov, Anastasia V. Gazzaeva

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Abstract

The results of extraction purification of visbreaking gas oil by Kirishinefteorgsintez LLC, divided into a light fraction of 204-264oC and a heavy fraction of 257-343oC by vacuum distillation, are presented. By four–stage countercurrent extraction of the light fraction with N, N - dimethylformamide at a mass ratio of 1.5:1 to raw materials and a temperature of 40 °C, the sulfur content was reduced from 1.911% by weight to 0.240% by weight in the raffinate. The results of a single-stage extraction of the heavy fraction of visbreaking gas oil with the sulfur content of 2.406% by weight are presented. The extraction was performed by mixtures of N, N – dimethylformamide with N – methylmorpholinone – 3 of the composition 50/50% by weight with mass ratios to raw materials of 0.5:1, 0.6:1 and 0.75:1. The extraction was also performed by mixtures of these solvents with the content of N – methylmorpholinone – 3 in the mixed extractant of 30 and 70% by weight and the mass ratio to raw materials 0.6:1. The results of two–stage extraction purification in cross–current with a mixture of N, N – dimethylformamide – N - methylmorpholinone - 3 of the composition 50/50% by weight with a mass ratio to the heavy fraction of 0.6:1 are presented. By four–stage countercurrent extraction purification with the mixed extractant containing N – methylmorpholinone - 3 30% by weight at a mass ratio of 1.5:1 to raw materials and a temperature of 40 oC, the raffinate was obtained with a yield of 51.6% by weight with the sulfur content of 0.952% by weight. During the process the degrees of extraction were, % by weight: organosulfur components – 79.6, nitrogen–containing compounds – 93.4, polyaromatic hydrocarbons – 88.6 and alkenes – 60.9. By mixing the extracted refined products, marine fuel can be obtained that meets the requirements for sulfur content - no more than 0.5% by weight

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n, n -二甲基甲酰胺- n -甲基啉酮-3与n, n -二甲基甲酰胺轻馏分混合萃取纯化重馏分降粘气油

介绍了Kirishinefteorgsintez有限责任公司用真空蒸馏法提取提纯脱粘气油(204 ~ 264oc轻馏分和257 ~ 343oc重馏分)的结果。以N, N -二甲基甲酰胺为原料，以1.5:1的质量比，在40℃条件下，对轻馏分进行四段逆流萃取，可使萃余液中硫含量由1.911%(重量)降至0.240%(重量)。介绍了一段萃取重量硫含量为2.406%的脱粘气重馏分的结果。采用N, N -二甲基甲酰胺与N -甲基morpholinone - 3的质量比为0.5:1、0.6:1和0.75:1，质量比为50/50%(重量比为50%)的混合物进行萃取。N -甲基啉酮- 3在混合萃取剂中的质量比为30%和70%，与原料的质量比为0.6:1。给出了以N, N -二甲基甲酰胺- N -甲基啉酮- 3为原料，质量比为0.6:1，质量比为50/50%的混合物进行两级萃取纯化的结果。采用含N -甲基亚硝基啉酮- 3的混合萃取剂，以质量比为1.5:1与原料的质量比为40℃，进行四级逆流萃取纯化，得到的萃液收率为51.6%(重量)，硫含量为0.952%(重量)。在此过程中，有机硫组分的提取率为79.6，含氮化合物为93.4，多芳烃为88.6，烯烃为60.9。将提取的成品油进行混合，可以得到符合含硫量要求的船用燃料——重量比不超过0.5%

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Bulletin of the Saint Petersburg State Institute of Technology (Technical University)

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