Abstract:

A new generation of low-pressure hydrogenation technology was adopted for hydrofining to expand the distillation range and increase the production of No. 3 jet fuel. The jet fuel product was subjected to a one-year storage test. A comparative analysis was conducted on the feedstocks before and after the adoption of the new technology. The results showed that the properties of the expanded feedstocks decreased compared to the original process, with little change in hydrocarbon composition. The density, sulfur content and nitrogen content increased significantly while its smoke point went down and its naphthalene-hydrocarbon content increased twice, and its freezing point rising from-59.9 ℃ to-51.0 ℃, but the product was still qualified No.3 jet fuel. The properties of the new product and the product after storage for 1 a were fully analyzed and compared according to the No. 3 jet fuel product standard. At the same time, the key items such as dynamic thermal oxidation stability breaking point and static thermal oxidation stability precipitation were compared and analyzed. The results showed that the results of full analysis items changed slightly during the storage of jet fuel with extended distillation range, but they were still qualified. The breaking point of dynamic thermal oxidation stability was greater than 300 ℃, the static oxidation precipitation was not greater than 0.5 mg/100 mL, and the mass fraction of basic nitrogen was less than 1 μg/g. The key indicators were better than the requirements of the No.3 jet fuel standard, and the product yield increased by 47.7% compared to before expanding the distillation range.

Key words: hydrofining, jet fuel, extended distillation range, storage test, thermal oxidation stability, break point, sedimentation amount, basic nitrogen

摘要：

采用新一代低压加氢技术进行加氢精制拓宽馏程增产3号喷气燃料，并对所得喷气燃料产品进行了长达1 a的贮存试验。对采用新技术前后的原料进行了对比分析，结果表明：拓宽原料品质较原工艺总体有所下降，烃组成变化不大，密度、硫含量、氮含量增加明显，烟点有所下降，萘系烃含量增加1倍，冰点由-59.9℃升高到-51.0℃,但所出产品仍为合格的3号喷气燃料。对新产品及贮存1 a后的产品性质按3号喷气燃料产品标准进行了全分析对比，同时进行了动态热氧化安定性破点、静态热氧化安定性沉淀量等关键项目的对比分析。结果显示，拓宽馏程喷气燃料贮存期间全分析项目结果略有变化但仍都合格；动态热氧化安定性破点大于300℃,静态氧化沉淀量不大于0.5 mg/100mL,碱性氮质量分数降至1μg/g以下，关键指标均优于3号喷气燃料标准要求，同时产品收率与拓宽馏程前相比增加了47.7%。

关键词: 加氢精制, 喷气燃料, 拓宽馏程, 贮存试验, 热氧化安定性, 破点, 沉淀量, 碱性氮