化工学报 ›› 2021, Vol. 72 ›› Issue (10): 5172-5182.DOI: 10.11949/0438-1157.20210488
刘美佳1(),王刚1(),张忠东2(),许顺年1,王皓3,党法璐1,何盛宝2
收稿日期:
2021-04-08
修回日期:
2021-06-02
出版日期:
2021-10-05
发布日期:
2021-10-05
通讯作者:
王刚,张忠东
作者简介:
刘美佳(1994—),女,博士研究生,基金资助:
Meijia LIU1(),Gang WANG1(),Zhongdong ZHANG2(),Shunnian XU1,Hao WANG3,Falu DANG1,Shengbao HE2
Received:
2021-04-08
Revised:
2021-06-02
Online:
2021-10-05
Published:
2021-10-05
Contact:
Gang WANG,Zhongdong ZHANG
摘要:
考察了碳五烷烃的热裂解和催化裂解反应性能,发现正戊烷和异戊烷的裂解反应产物存在差异;进一步分析了正戊烷和异戊烷的裂解反应机理,以及裂解生成低碳烯烃和甲烷的区别。结果表明,在热裂解条件下,正戊烷的(乙烯+丙烯)选择性高于异戊烷,异戊烷的丁烯和甲烷选择性高于正戊烷;650℃时,正戊烷和异戊烷的热裂解产品中(乙烯+丙烯)、丁烯、甲烷的选择性分别为37.48%、7.23%、6.75%和19.57%、25.16%、9.36%。而在催化裂解条件下,异戊烷的(乙烯+丙烯)、丁烯、甲烷选择性均高于正戊烷;650℃时,正戊烷和异戊烷的催化裂解产品中(乙烯+丙烯)、丁烯、甲烷的选择性分别为37.16%、9.11%、7.80%和47.70%、14.45%、13.79%。此外,发现在高温裂解条件下异构烷烃比正构烷烃容易裂解生成丁烯和甲烷。
中图分类号:
刘美佳,王刚,张忠东,许顺年,王皓,党法璐,何盛宝. 碳五烷烃裂解制低碳烯烃反应性能的分析[J]. 化工学报, 2021, 72(10): 5172-5182.
Meijia LIU,Gang WANG,Zhongdong ZHANG,Shunnian XU,Hao WANG,Falu DANG,Shengbao HE. Analysis of reaction performance of high efficient pyrolysis of C5 alkanes to light olefins[J]. CIESC Journal, 2021, 72(10): 5172-5182.
拓扑结构 | 硅铝比 | 比表面积/(m2/g) | 微孔体积/(cm3/g) | 孔径 /nm | 弱酸量/(mmol/g) | 强酸量/(mmol/g) | 总酸量/(mmol/g) |
---|---|---|---|---|---|---|---|
MFI | 120 | 397.520 | 0.141 | 0.520 | 0.116 | 0.102 | 0.218 |
表1 催化裂解反应使用的分子筛性质
Table 1 Properties of zeolites used in catalytic pyrolysis
拓扑结构 | 硅铝比 | 比表面积/(m2/g) | 微孔体积/(cm3/g) | 孔径 /nm | 弱酸量/(mmol/g) | 强酸量/(mmol/g) | 总酸量/(mmol/g) |
---|---|---|---|---|---|---|---|
MFI | 120 | 397.520 | 0.141 | 0.520 | 0.116 | 0.102 | 0.218 |
碳数 | 原料 | 转化率/% | 甲烷选择性/% | 乙烯选择性/% | 丙烯选择性/% | 丁烯选择性/% | 文献 | |
---|---|---|---|---|---|---|---|---|
热裂解 | C5 | 正戊烷 | 77.90 | 11.94 | 43.13 | 23.88 | 10.14 | [ |
2-甲基丁烷 | 78.20 | 15.47 | 20.72 | 25.06 | 25.83 | |||
C7 | 正庚烷 | 87.80 | 8.09 | 54.44 | 19.70 | 11.16 | [ | |
2-甲基己烷 | 91.50 | 12.02 | 30.27 | 25.25 | 18.36 | |||
3-甲基己烷 | 94.30 | 12.94 | 31.81 | 22.27 | 15.38 | |||
C8 | 正辛烷 | 92.70 | 9.17 | 46.60 | 18.34 | 11.33 | [ | |
3-甲基庚烷 | 94.70 | 10.67 | 38.54 | 20.17 | 15.42 | |||
2,3-二甲基己烷 | 98.60 | 16.02 | 17.65 | 26.88 | 16.53 | |||
催化裂解 | C8 | 正辛烷 | 8.66 | 9.29 | — | — | 52.47 | [ |
3-甲基庚烷 | 7.23 | 23.25 | — | — | 61.36 | |||
2,5-二甲基庚烷 | 6.04 | 33.93 | — | — | 72.34 | |||
C8 | 正辛烷 | 96.66 | — | — | — | 9.22 | [ | |
异辛烷 | 61.15 | — | — | — | 15.14 |
表2 正构烷烃和异构烷烃裂解反应结果对比
Table 2 Comparison of cracking reaction results of n-alkanes and isoalkanes
碳数 | 原料 | 转化率/% | 甲烷选择性/% | 乙烯选择性/% | 丙烯选择性/% | 丁烯选择性/% | 文献 | |
---|---|---|---|---|---|---|---|---|
热裂解 | C5 | 正戊烷 | 77.90 | 11.94 | 43.13 | 23.88 | 10.14 | [ |
2-甲基丁烷 | 78.20 | 15.47 | 20.72 | 25.06 | 25.83 | |||
C7 | 正庚烷 | 87.80 | 8.09 | 54.44 | 19.70 | 11.16 | [ | |
2-甲基己烷 | 91.50 | 12.02 | 30.27 | 25.25 | 18.36 | |||
3-甲基己烷 | 94.30 | 12.94 | 31.81 | 22.27 | 15.38 | |||
C8 | 正辛烷 | 92.70 | 9.17 | 46.60 | 18.34 | 11.33 | [ | |
3-甲基庚烷 | 94.70 | 10.67 | 38.54 | 20.17 | 15.42 | |||
2,3-二甲基己烷 | 98.60 | 16.02 | 17.65 | 26.88 | 16.53 | |||
催化裂解 | C8 | 正辛烷 | 8.66 | 9.29 | — | — | 52.47 | [ |
3-甲基庚烷 | 7.23 | 23.25 | — | — | 61.36 | |||
2,5-二甲基庚烷 | 6.04 | 33.93 | — | — | 72.34 | |||
C8 | 正辛烷 | 96.66 | — | — | — | 9.22 | [ | |
异辛烷 | 61.15 | — | — | — | 15.14 |
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