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用氧化-萃取法脱除催化裂化柴油加氢后的剩余硫化物 被引量:16
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作者 战风涛 吕志凤 +1 位作者 董晓芳 徐永强 《石油炼制与化工》 CAS CSCD 北大核心 2003年第11期22-26,共5页
催化裂化柴油加氢后的剩余硫化物主要为二苯并噻吩、4-甲基二苯并噻吩和4,6-二甲基二苯并噻吩为代表的多环芳香硫化物。研究用H_2O_2/甲酸体系氧化加氢后的柴油,并用有机溶剂萃取,除去二苯并噻吩类的氧化产物。试验发现,溶剂N,N-二甲基... 催化裂化柴油加氢后的剩余硫化物主要为二苯并噻吩、4-甲基二苯并噻吩和4,6-二甲基二苯并噻吩为代表的多环芳香硫化物。研究用H_2O_2/甲酸体系氧化加氢后的柴油,并用有机溶剂萃取,除去二苯并噻吩类的氧化产物。试验发现,溶剂N,N-二甲基甲酰胺(DMF)的萃取效果优于二甲亚砜、乙腈及甲醇。在50℃下氧化反应15min,氧化后用DMF以剂油比1:2萃取,柴油中硫质量分数可从665.5μg/g降至83.6μg/g,脱硫油收率94.0%,氧化剂可循环使用3次。氧化-萃取前后柴油的GC-FPD分析表明,柴油中二苯并噻吩(DBT)类完全脱除。柴油氧化产物的IR分析表明,DBT类硫化物的氧化产物为砜类。 展开更多
关键词 氧化-萃取法 催化裂化 柴油 加氢裂化 硫化物 脱硫
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氧化-萃取法精制催化裂化柴油 被引量:1
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作者 吕兰涛 林海波 +1 位作者 尹瑞 王宗廷 《山东化工》 CAS 2002年第1期4-6,8,共4页
催化裂化柴油由于含有烯烃、氮化物、硫化物等不安定组分 ,使柴油的储存安定性变差。本氧化 -萃取精制法采用环氧琥珀酸作氧化剂、以及二甲亚砜碱液进行两步法精制 。
关键词 氧化-萃取法 精制 催化裂化 柴油 安定性
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Extraction of Perilla Seed Oil Using Supercritical Carbon Dioxide and GC-MS Analysis 被引量:5
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作者 杨丽嫔 周游 +2 位作者 耿姗姗 刘末 雷红 《Agricultural Science & Technology》 CAS 2017年第8期1509-1512,共4页
[Objective] This study was aimed to determine the optimal parameters for the extraction of perilla seed oil to obtain high-quality perilla seed oil and analyze its compositions. [Method] In this study, perilla seed oi... [Objective] This study was aimed to determine the optimal parameters for the extraction of perilla seed oil to obtain high-quality perilla seed oil and analyze its compositions. [Method] In this study, perilla seed oil was extracted using supercritical CO2 (SC-CO2). The effects of extraction time, temperature and pressure were investigated by single-factor experiments and orthogonal array testing (ORT). The chemical compositions of extracted perilla seed oil were investigated by GC-MS. [Result] The optimal conditions for the extraction of perilla seed oil using SC-CO2 were extraction time of 4 h, extraction temperature at 40 ℃, and extraction pressure at 23 MPa. Under these conditions, the extraction yield of perilla seed oil was maximized to 12.43%. GC-MS analysis revealed that perilla seed oil was a complex mixture containing 76.183% α-linolenic acid. [Conclusion] Supercritical CO2 extraction was proven to be an effective technology to extract oil from perilla seed, and GCMS was also a satisfactory method for analyzing the compositions of perilla seed oil. 展开更多
关键词 Perilla seed essential oil Supercritical carbon dioxide extraction Or-thogonal array testing (OAT) GC-MS
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Influences of the [Co^2+]/[Co^3+] Ratio on the Process of Liquid-phase Oxidation of Toluene by Air 被引量:8
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作者 唐盛伟 沈伟 梁斌 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第4期613-617,共5页
Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid.In a φ48mm bubble column reactor,the commercial process of toluene liquid phase oxidation was conducted with Co(CH... Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid.In a φ48mm bubble column reactor,the commercial process of toluene liquid phase oxidation was conducted with Co(CH3COO)2.4H2O as catalyst.The Co2+ concentration [Co2+] was determined by extraction spectrophotometry and hereby the Co3+ concentration [Co3+] was obtained by mass balance.The results showed that [Co3+] reached the maximum at about 25-30min.[Co3+] increased with increasing Co catalyst amount at total Co concentration<150 mg.L-1 of toluene.The conversion of toluene,yield and selectivity of benzoic acid increased with the increasing [Co3+/Co2+] max.A high [Co3+] and a high [Co3+]/[Co2+] ratio are beneficial to the reaction. 展开更多
关键词 TOLUENE benzoic acid liquid-phase oxidation cobaltous acetate
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Optimization of Supercritical Carbon dioxide Extraction of Ginger Essential Oil by Response Surface Method 被引量:5
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作者 雷红 周仁杰 +2 位作者 魏巧年 李晓乐 吴静 《Agricultural Science & Technology》 CAS 2016年第9期2178-2182,共5页
[Objective] Ginger essential oil (GEO) is widely used in food production and medical field in recent years due to its prominent biological functions, and this study was conducted to obtain high-quality and high-puri... [Objective] Ginger essential oil (GEO) is widely used in food production and medical field in recent years due to its prominent biological functions, and this study was conducted to obtain high-quality and high-purity ginger essential oil from the fresh ginger. [Method] GEO was extracted from ginger roots by supercritical fluid extraction (SFE) method. The effects of flow rate of CO2, mesh size of ginger powder and volume of entrainer were investigated by single-factor experiments and response surface method. The content and extraction rate of 6-gingerol represented the extraction index of GEO. [Result] The conditions were optimized as follows: flow rate of CO2 at 25 L/h, mesh size of ginger power of 80 mesh, and volume of anhydrous ethanol as entrainer of 92.46 ml. The optimal extraction rate of 6-gingerol was 3.21%, which was predicted by RSM. [Conclusion] The optimal process of supercritical carbon dioxide extraction of ginger essential oil was identified by singlefactor experiments and response surface method. The present study provides a satisfactory method for purifying GEO from ginger for industrial purpose. 展开更多
关键词 Ginger essential oil (GEO) Supercritical carbon dioxide extraction Response surface methodology
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Measurement and Correlation of the Solubility of Ligusticum Chuanxiong oil in Supercritical CO_2 被引量:7
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作者 孙永跃 李淑芬 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第6期796-799,共4页
Extraction of the Ligusticum Chuanxiong oil with supercritical CO2 (SC-CO2) was investigated at the temperatures ranging from 55℃ to 70℃ and pressure from 25 MPa to 35 MPa. The mass of Ligusticum Chuanxiong oil ex... Extraction of the Ligusticum Chuanxiong oil with supercritical CO2 (SC-CO2) was investigated at the temperatures ranging from 55℃ to 70℃ and pressure from 25 MPa to 35 MPa. The mass of Ligusticum Chuanxiong oil extracted increased with pressure at constant temperature. The initial slope of the extraction was considered as the solubility of oil in SC-CO2. Chrastil equation was used to correlate the solubility data of Ligusticum Chuanxiong oil. An improved Chrastil equation was also presented and was employed to correlate the solubility data, The correlation results show that the values of the average absolute relative deviation are 5.94% and 3.33% respectively, indicating the improved version has better correlation accuracy than that of Chrastil equation. 展开更多
关键词 supercritical CO2 extraction SOLUBILITY Ligusticum Chuanxiong oil CORRELATION
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