化工进展 ›› 2019, Vol. 38 ›› Issue (s1): 46-51.DOI: 10.16085/j.issn.1000-6613.2019-0781

• 化工过程与装备 • 上一篇    下一篇

哌嗪类有机胺脱除二氧化硫性能及机理探讨

孙志豪, 郭子东, 陈俊, 陆星洲, 魏凤玉   

  1. 合肥工业大学化学与化工学院, 先进催化材料与反应工程安徽省重点实验室, 安徽 合肥 230009
  • 收稿日期:2019-05-13 修回日期:2019-05-17 出版日期:2019-11-16 发布日期:2019-11-16
  • 通讯作者: 魏凤玉,教授,硕士生导师,研究方向为化工传质与分离技术、化工环保技术及新材料的开发。
  • 作者简介:孙志豪(1995-),男,硕士研究生,研究方向为化工传质与分离技术。E-mail:sunzhihoo@163.com。

Performances and mechanism of piperazine-based organic amines removal of SO2

SUN Zhihao, GUO Zidong, CHEN Jun, LU Xingzhou, WEI Fengyu   

  1. School of Chemistry and Chemical Engineering, Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
  • Received:2019-05-13 Revised:2019-05-17 Online:2019-11-16 Published:2019-11-16

摘要: 选择哌嗪(PZ)及其衍生物NN'-双(2-羟乙基)哌嗪(BHEP)、NN'-双(2-羟丙基)哌嗪(HPP)、1-(2-羟乙基)-4-(2-羟丙基)哌嗪(HEHPP)、1-(2-羟乙基)哌嗪(HEP)5种哌嗪类有机胺作为SO2吸收剂,采用动态法在填料塔中吸收模拟烟气中的SO2并对吸收剂进行热再生。4次循环吸收解吸实验结果表明:有机胺的碱性与位阻效应共同决定其脱硫性能。PZ的pKa最大,对SO2有较大的吸收容量,首次饱和吸收容量高达0.8428mol/mol,但难解吸且再生能耗高,首次解吸率仅为78.9%,4次循环后饱和吸收容量下降了54.3%,循环吸收能力较差;HEP吸收效果次于PZ,其解吸性能较PZ有所提高;双羟基哌嗪类二胺的pKa最小,饱和吸收容量相对较低,平均不低于0.4mol/mol;解吸率高,平均保持在95%以上,且再生能耗低、稳定性好,其中HEHPP的脱硫性能介于BHEP和HPP之间。因此,双羟基哌嗪可作为新型高效脱硫剂。

关键词: 哌嗪类有机胺, 脱二氧化硫, 循环吸收解吸, 再生能耗

Abstract: The desulfurization performances of piperazine-based organic amines were studied experimentally by the dynamic absorption of SO2 from the simulated flue gas in a packed column and the solvent was thermal regenerated. The evaluation was done for a number of organic amines, including piperazine (PZ) and its derivatives N,N'-bis (2-hydroxyethyl) piperazine (BHEP), N,N'-bis (hydroxypropyl) piperazine (HPP), 1-(2-hydroxyethy) -4-(2-hydroxypropyl) piperazine (HEHPP), 1-(2-hydroxyethy) piperazine (HEP). The results of the four times absorption-desorption cycles showed that the desulfurization performances of organic amines are determined by its basic strength and steric effects. The higher pKa of PZ, the higher absorption capacity of 0.8428mol/mol for SO2 at the first time, but it is difficult to desorption with the first desorption rate of 78.9%, and requires the highest regeneration energy. The saturated absorption capacity decreased by 54.3% after four cycles, the cyclic absorption performance is the poorest. The saturated absorption capacity of HEP is lower than that of PZ, but its desorption performance is improved. The dihydroxy piperazine diamines with lower pKa have relatively low the saturated absorption capacities and high desorption rates. After the 4 cycles, the average absorption capacities are not less than 0.4 mol/mol, and the average desorption rates are above 95%. Meanwhile, they have the lowest regeneration energy. The desulfurization performances of HEHPP are between those of BHEP and HPP. Therefore, the dihydroxy piperazine shows great potential for a novel desulfurization from the flue gas.

Key words: piperazine-based organic amine, desulfurization, cyclic absorption and desorption, regeneration energy

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