Effect of polyhydroxyalcohols on COS absorption in aqueous methyldiethanolamine

被引：10

作者：

Lammers, JNJJ ^{[1
]}

Haringa, J ^{[1
]}

Littel, RJ ^{[1
]}

机构：

[1] UNIV TWENTE,DEPT CHEM ENGN,7500 AE ENSCHEDE,NETHERLANDS

来源：

CHEMICAL ENGINEERING JOURNAL AND THE BIOCHEMICAL ENGINEERING JOURNAL | 1995年 / 60卷 / 1-3期

关键词：

absorption; amine; enhancement; mass transfer; reaction kinetics;

D O I：

10.1016/0923-0467(96)80009-1

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The removal of COS from natural gas is an area of increasing interest in natural gas sweetening, in view of tightening sulfur specifications. In an attempt to improve the absorption of COS in aqueous methyldiethanolamine (MDEA) solutions, the addition of polyhydroxyalcohols (PHA) was studied in small-scale laboratory tests. The addition of 25-30 wt.% ethylene glycol or glycerol increased the reaction rate by a factor up to 5-10, depending on the solvent loading and MDEA concentration. However, pilot plant studies revealed that the COS absorption could not be improved, or even worsened, under practical absorbing conditions. This is attributed to increased solvent viscosity which counteracts the increased reaction rate. The selectivity with respect to CO, absorption improved, however, in some cases by up to a factor of two.

引用

页码：123 / 129

页数：7

共 14 条

[1]

Kohl A.L., Riesenfeld F.C., Gas Purification, (1979)

[2]

Al-Ghawas H.A., Ruiz-Ibanez G., Sandall O.C., Absorption of carbonyl sulfide in aqueous methyldiethanolamine, Chem. Eng. Sci., 44, pp. 631-639, (1989)

[3]

Littel R.J., Versteeg G.F., van Swaaij W.P.M., Kinetic study of COS with tertiary alkanolamine soltuions. 1. Experiments in an intensely stirred batch reactor, Ind. Eng. Chem. Res., 31, pp. 1262-1269, (1992)

[4]

Alper E., Comments on kinetics of reaction of carbonyl sulphide with aqueous MDEA, Chem. Eng. Sci., 48, pp. 1179-1180, (1993)

[5]

Littel R.J., Selective carbonyl sulfide removal in acid gas treating processes, Thesis, (1991)

[6]

Philipp B., Dautzenberg H., Kinetische Untersuchungen zur Bildung und Zersetzung von Monothiocarbonat in wäβriger Lösung, Z. Phys. Chem., 229, pp. 210-224, (1965)

[7]

Littel R.J., Versteeg G.F., van Swaaij W.P.M., Solubility and diffusivity data for the absorption of COS, CO2 and N2O in amine solutions, J. Chem. Eng. Data, 37, pp. 49-55, (1992)

[8]

Ferm R.J., The chemistry of carbonyl sulfide, Chem. Rev., 57, pp. 621-640, (1957)

[9]

Oyevaar M.H., Morssinkhof R.W.J., Westerterp K.R., The kinetics of the reaction between CO2 and diethanolamine in aqueous ethyleneglycol at 298 K: a viscous gas-liquid reaction system for the determination of interfacial areas in gas-liquid contractors, Chem. Eng. Sci., 45, pp. 3283-3298, (1990)

[10]

Azbel D., Two-phase Flows in Chemical Engineering, (1981)

← 1 2 →