分子筛催化油酸裂化液体产物指标分析和机理研究
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摘要
为实现各类油品的合理化利用,采用HZSM-5分子筛催化剂对油酸进行催化裂化试验,考察了油酸裂化液体产物的成分及品质,深入探究了油酸裂化的中间过程。结果表明:油酸裂化液体产物主要成分是芳香烃类物质,含量为87. 41%,密度为798. 1 kg/m~3,酸价(KOH)为4. 36 mg/g,黏度为0. 74 mPa·s,皂化值(KOH)为9. 63 mg/g,硫含量为0. 000 4%。液体产物与石化汽油品质相似,硫含量更低,辛烷值更高,品质较好。油酸本身不含芳香烃,经催化裂化生成了较多芳香烃类物质,其中液体产物中对二甲苯含量最高,为37. 02%。
In order to realize the rational utilization of various oils,the cracking experiment of oleic acid catalyzed by HZSM-5 molecular sieve was carried out.The composition and quality of oleic acid cracking liquid product and intermediate process of oleic acid cracking were investigated.The results showed that the main component of oleic acid cracking liquid product was aromatic hydrocarbon,accounting for 87.41%.The density,acid value,viscosity,saponification value and sulfur content of the liquid product were 798.1 kg/m~3,4.36 mg KOH/g,0.74 mPa·s,9.63 mg KOH/g and 0.000 4% respectively.The liquid product was similar in quality to petrochemical gasoline,with lower sulfur content,higher octane number and better quality.Oleic acid itself did not contain aromatic hydrocarbons,and more aromatic hydrocarbons were formed by catalytic cracking.The content of paraxylene was the highest,accounting for 37.02%.
In order to realize the rational utilization of various oils,the cracking experiment of oleic acid catalyzed by HZSM-5 molecular sieve was carried out.The composition and quality of oleic acid cracking liquid product and intermediate process of oleic acid cracking were investigated.The results showed that the main component of oleic acid cracking liquid product was aromatic hydrocarbon,accounting for 87.41%.The density,acid value,viscosity,saponification value and sulfur content of the liquid product were 798.1 kg/m~3,4.36 mg KOH/g,0.74 mPa·s,9.63 mg KOH/g and 0.000 4% respectively.The liquid product was similar in quality to petrochemical gasoline,with lower sulfur content,higher octane number and better quality.Oleic acid itself did not contain aromatic hydrocarbons,and more aromatic hydrocarbons were formed by catalytic cracking.The content of paraxylene was the highest,accounting for 37.02%.
引文
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[2]崔君君,苏有勇,王朝玮,等.小桐子油气相催化裂化制备生物基燃油的试验研究[J].中国油脂,2018,43(11):45-48.
[3]田华,李春义,杨朝合,等.棕榈油的催化转化研究[J].石油学报(石油加工),2008,24(3):256-262.
[4]YANG H,XU Q,LI H,et al. Reaction mechanism of oxygenate components of biomass pyrolysis oil on HZSM-5zeolite[J]. Asian J Chem,2013,25(3):1654-1656.
[5]刘真,卢义和,宫素芝,等.我国油酸的生产现状及展望[J].河北化工,2006,29(9):18-20,22.
[6]WANG S R,CAI Q J,WANG X Y,et al. Biogasoline production by co-cracking of model compound mixture of bio-oil and ethanol over HZSM-5[J]. Chin J Catal,2014,35(5):709-722.
[7]李光辉.中国市售车用汽柴油中硫和烃类含量现状研究[D].广州:中国科学院研究生院(广州地球化学研究所),2016.
[8]KATIKANENI S P R,ADJAYE J D,IDEM R O,et al. Catalytic conversion of canola oil over potassium-impregnated HZSM-5 catalysts:C2-C4 olefin production and model reaction studies[J]. Ind Eng Chem Res,1996,35(10):3332-3346.
[9]田华.脂肪酸酯的催化裂化研究[D].山东青岛:中国石油大学(华东),2008.
[10]许友好,汪燮卿.催化裂化过程反应化学的进展[J].中国工程科学,2007,9(8):6-14.
[11]陈艳红,韩东敏,崔红霞,等.多级孔ZSM-5沸石分子筛的制备研究进展[J].无机盐工业,2017,49(7):3-6.
[12]CHENG Z I,JI X,LI S Y,et al. Thermodynamics calculation of the pyrolysis of vegetable oils[J]. Energ Source,2004,26(9):849-856.