Thermal Degradation of Piperazine in Sulfolane Aqueous Solution in CO2 Capture Process

被引:1
作者
Zamani, Mousa [1 ]
Shokouhi, Mohammad [2 ]
Fatoorehchi, Hooman [1 ]
Vahidi, Mehdi [2 ]
机构
[1] Univ Tehran, Coll Engn, Sch Chem Engn, POB 11365-4563, Tehran, Iran
[2] Res Inst Petr Ind RIPI, Gas Res Div, Gas Refining Technol Grp, West Blvd,Azadi Sport Complex,POB 14665-137, Tehran, Iran
关键词
Piperazine; Carbon dioxide; Thermal degradation; Hybrid solvent; Pseudo rate constant; OXIDATIVE-DEGRADATION; HYDROGEN-SULFIDE; EXPERIMENTAL SOLUBILITY; ALKANOLAMINE BLENDS; CARBON-DIOXIDE; MONOETHANOLAMINE; ABSORPTION; MEA; MERCAPTAN; SOLVENTS;
D O I
10.1007/s10953-023-01342-8
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Thermal degradation of piperazine (PZ) in aqueous and mixed sulfolane (SFL) (30% by weight) + H2O solution as a hybrid context was investigated as a function of temperature and two levels of piperazine concentrations and two levels of carbon dioxide loadings. Degradation of PZ in aqueous solution has been found to be first order. The pseudo rate constants for 5%wt solution of piperazine at 145, 160 and 175 degrees C in aqueous solution are 2.24 x 10(-9), 1.09 x 10(-8) and 2.27 x 10(-7) and in the hybrid media are 3.56 x 10(-8), 7.67 x 10(-8) and 1.19 x 10(-7) per second, respectively, and the activation energies for the aqueous and hybrid media were estimated 238.71 and 62.77 kJ/mole, respectively. Considering the most abundant degradation products identified; 3-(hydroxyethyl)-2-oxazolidone (HEOD), N,N-bis-(2-hydroxyethyl)-piperazine (BHEP), N,N',N-tris-(hydroxyethyl) ethylenediamine (THEED), 1-[2-[(2-Aminoethyl) amino] ethyl] piperazine (AEAEPZ) and 1-Methylpiperazine (1-MPZ), the degradation pathway of PZ in both media is expected to proceed through ring opening of protonated PZ with the attack of other piperazine molecules on its alpha carbon. The presence of SFL only accelerates the reactions without changing the degradation mechanism.
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页码:486 / 505
页数:20
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