两段提升管催化裂解多产丙烯研究

Maximizing yield of propylene by two-stage riser catalytic pyrolysis of heavy oil

关键词:  两段提升管  催化裂解  丙烯

Key words:  two-stage riser  catalytic pyrolysis  propylene

摘要:

在分析两段提升管催化裂化特点的基础上，提出了重油两段催化裂解多产丙烯兼顾汽油和柴油生产的技术思 路,以大庆常渣为原料,采用专门研制的LTB-2催化剂，在提升管反应装置上进行了实验。结果表明，在实验条件 下,大庆常渣经两段提升管催化裂解反应，在丙烯收率达到22%的情况下,干气收率只有5.37% ,总液收率仍然可以 超过82% ,并且汽油的烯烃含量低、芳烃含量高,为高辛烷值汽油调和组分;生成的柴油密度在890 kg/m³左右，计算 十六烷值在30左右,与通常的催化柴油性质相当。重油经两段提升管催化裂解,可在多产丙烯的同时,兼顾汽油和 柴油的生产。

Abstract:

The characteristics of the two-stage riser catalytic cracking that strengthen the catalysis to reduce the yield of dry gas are favorable for maximizing propylene yield of heavy oil pyrolysis. The experimental results show that using the special catalyst of LTB-2, the yield of propylene reaches 22% , the yield of the dry gas is only 5.37% and the total liquid yield is more than 82% when the first stage riser is fed with Daqing atmospheric residue and the second is fed with the mixture of the gasoline and the remaining heavy oil from the first-stage reaction. The gasoline from the second stage contains less than 24% olefins and more than 50% aromatics, and is high octane number component. The density and calculated cetane number of the diesel are 890 kg/m³ and about 30 respectively- These properties are aiso acceptable. Thus，the technology of two-stage riser catalytic pyrolysis of heavy oil can maximize propylene yield without the cost of light oil quality.