Study of Characteristics and Kinetics of Catalytic Degradation of Asphaltene
-
摘要: 采用热解气相色谱仪 (Py—GC),对东营凹陷烃源岩可溶有机质中的沥青质进行了热解模拟实验。考察了蒙脱石和K2CO3 介质对沥青质催化降解过程的影响,求得了沥青质的催化降解动力学参数。结果表明,在K2CO3 介质存在下,沥青质热解生成气态烃、轻烃和重烃的收率均有明显的提高,模拟温度下总检测烃收率提高了约 2 0 %;在蒙脱石介质存在下,除重烃收率下降外,气态烃和轻烃收率均有所提高,模拟温度下总检测烃收率提高了约 10 %。与之相对应,除蒙脱石存在下重烃的生成活化能有所增加外,介质的存在均不同程度地降低了其它各热解产物的生成活化能。最后,对沥青质的催化降解机理进行了初步的探讨.Abstract: The thermal simulation experiments on the catalytic degradation of Dongying asphaltene have been carried out by using pyrolvsis gas chromatography at the presence of mineral and salt.The isothermal experimental data are used to develop a kinetic model of the generation of the pyrolvsates including gas hvdrocarhon, light hydrocarbon and heavy hydrocarbon.It is found that K2CO3 acts as a catalyst to promote the generation of all pyrolvsates.At the temperature of 570℃,the yield of total hydrocarbons is increased by about 20% in the presence of K2CO3.Montmorillonite increases the veild of gas and light hydrocarbon but decreases the yield of heavy hydrocarbon.At the temperature of 570℃,the yield of total hydrocarbons is increased by about 10% in the presence of montmorillonite.The higher activation energy is obtained for the generation of heavy hydrocarbon in the presence of montmorillonite while the lower activation energies are calculated for other pyrolvsates. Finally, the mechanism of catalytic degradation of asphaltene is tentatively investigated.
-
Key words:
- Dongying depression /
- asphaltene /
- simulation experiment /
- catalytic degradation /
- kinetics
-
[1] 1 张国防. 盐湖相石油的早期生成[J]. 石油勘探与开发，1993，20（5）：43 ~ 48
2 张枝焕等. 粘土矿物对干酪根热解生烃过程的影响[J]. 石油勘探与开发，1994，21（5）：29 ~ 37
3 Brooks B T. Evidence of catalytic action in petroleum[J]. Ind. Eng. Chem.,1952，44（11）：2 570 ~ 2 577
4 Horsfield B and Dougias A G. The influence of minerals on the pyrolysis of kerogens [J]. Geochim. Cosmochim. Acta.,1980，44：1 119 ~ 1 131
5 秦匡宗. 干酪根的热解聚与未熟石油的形成. 有机地球化学论文集[C]，北京：地质出版社，1987.159 ~ 168
6 王铁冠，钟宁宁，候读杰等. 低熟油气形成机理与分布[M]. 北京：石油工业出版社，1995
7 张在龙，孙燕华，劳永新. 未熟生油岩中含铁矿物对脂肪酸低温催化脱羧生烃的作用[J]. 科学通报，1998，43（24）：2 649 ~ 2 652
8 李忠. 试论油气形成过程中粘土矿物的催化作用[J]. 石油实验地质，1992，14（1）：59 ~ 63
9 林世静. 干酪根催化降解生烃特征和动力学的研究，硕士学位论文[D]. 北京：石油大学，1998 -
点击查看大图
计量
- 文章访问数: 491
- HTML全文浏览量: 18
- PDF下载量: 517
- 被引次数: 0
下载:
