Study on Improving Oxidation Stability of Catalytically-Cracked Diesel Oil

In this article, oxidation stabilities of catalytically-cracked diesel oil extracted with several solvents were studied respectively. The experimental results showed that double-solvent extraction was the better method than others, in which furfural containing transition metal ion was used as the first extraction solvent and the 95% ethanol solution was the second extraction solvent. During the course of accelerated storage test, the amount of sediment was reduced from 27.56 mg/100 mL to 0.43 mg/100 mL, and met the requirement of premium grade diesel oil. Under the experimental condition: shaking time of 3 min, the volume ratio of solvent to oil of one and operating temperature 30°C, the extraction result is most satisfied. The color and existent gum reached the standard of premium grade diesel oil. The removal rate of sulfur was up to 74.5%, the removal rate of nitrogen 93.8%. The cetane number of catalytically-cracked diesel oil was enhanced from 37.3 to 51.2. The oxidation stability was improved greatly after being treated.     

油浆糠醛抽提与产品应用

渣油催化油浆经双溶剂抽提后的抽余油,其饱和烃含量及Ｈ／Ｃ比得到提高,芳烃含量降低,可大大改善催化裂化进料质量,抽出的重质芳烃可作为橡胶软化剂、针状焦及增塑剂等原料,该工艺的实施能带来可观的经济效益     

桔核中柠檬苦素类物质最佳提取条件的探讨及清除DPPH活性的研究

文章对桔核中柠檬苦素类物质的提取条件及其清除DPPH活性进行研究。结果表明：桔核粉碎物以85倍体积的混合溶液（A：B=55：45，其中A为极性溶剂，B为极性溶剂），温度在65℃下，提取3．5h，一次提取即达到最佳的提取效果。桔核中的柠檬苦素清除DPPH自由基的IC50值为20．7μg／mL。     

Study on Improving Oxidation Stability of Catalytically-Cracked Diesel Oil

Abstract

In this article, oxidation stabilities of catalytically-cracked diesel oil extracted with several solvents were studied respectively. The experimental results showed that double-solvent extraction was the better method than others, in which furfural containing transition metal ion was used as the first extraction solvent and the 95% ethanol solution was the second extraction solvent. During the course of accelerated storage test, the amount of sediment was reduced from 27.56 mg/100 mL to 0.43 mg/100 mL, and met the requirement of premium grade diesel oil. Under the experimental condition: shaking time of 3 min, the volume ratio of solvent to oil of one and operating temperature 30°C, the extraction result is most satisfied. The color and existent gum reached the standard of premium grade diesel oil. The removal rate of sulfur was up to 74.5%, the removal rate of nitrogen 93.8%. The cetane number of catalytically-cracked diesel oil was enhanced from 37.3 to 51.2. The oxidation stability was improved greatly after being treated.