催化裂化柴油溶剂抽提降芳烃工艺技术研究

针对中国石化长岭分公司催化裂化柴油芳烃含量高、十六烷值低的问题，采用溶剂抽提降芳烃技术改善柴油质量，同时对抽出的芳烃进行分离和利用。实验结果表明：在130～150 ℃、剂油体积比1.5～6.0的条件下进行溶剂抽提，抽余油的芳烃质量分数降至38.4%～63.3%，十六烷值大于45，较原料提高了20个单位以上；所抽出的芳烃混合组分中单环芳烃（烷基苯）含量高，可以作为芳烃溶剂油。

RESEARCH ON THE SOLVENT EXTRACTION OF AROMATIC HYDROCARBON FROM FCC DIESEL FRACTIONS

The FCC diesel fraction of SINOPEC Changling Company was rich in aromatics and low in cetane number,thus,studies of extracting aromatic hydrocarbons from this diesel fraction with selected solvent to improve its cetane number were carried out.Test results showed that when solvent extractions were carried out under the conditions of extraction temperature in the range of 130—150 ℃,solvent to oil volume ratio in the range of 1.5—6.0,the aromatic mass fractions of these obtained raffinate oils could be decreased to 38.4%—63.3% and their cetane number reached more than 45,the increments were over 20 units as compared with the feed.The aromatic extract from this process was rich in monocylic aromatic,which could be used as aromatic solvent.