Effect of polyhydroxyalcohols on COS absorption in aqueous methyldiethanolamine

J.N.J.J. Lammers; J. Haringa; R.J. Littel

doi:10.1016/0923-0467(96)80009-1

Effect of polyhydroxyalcohols on COS absorption in aqueous methyldiethanolamine

J.N.J.J. Lammers, J. Haringa, R.J. Littel

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Abstract

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 CO2 absorption improved, however, in some cases by up to a factor of two.

Original language	Undefined
Pages (from-to)	123-129
Journal	The Chemical Engineering Journal and the Biochemical Engineering Journal
Volume	60
Issue number	1-3
DOIs	https://doi.org/10.1016/0923-0467(96)80009-1
Publication status	Published - 1995
Externally published	Yes

Keywords

IR-57294

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10.1016/0923-0467(96)80009-1

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Cite this

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title = "Effect of polyhydroxyalcohols on COS absorption in aqueous methyldiethanolamine",

abstract = "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 CO2 absorption improved, however, in some cases by up to a factor of two.",

keywords = "IR-57294",

author = "J.N.J.J. Lammers and J. Haringa and R.J. Littel",

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doi = "10.1016/0923-0467(96)80009-1",

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pages = "123--129",

journal = "The Chemical Engineering Journal and the Biochemical Engineering Journal",

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TY - JOUR

T1 - Effect of polyhydroxyalcohols on COS absorption in aqueous methyldiethanolamine

AU - Lammers, J.N.J.J.

AU - Haringa, J.

AU - Littel, R.J.

PY - 1995

Y1 - 1995

N2 - 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 CO2 absorption improved, however, in some cases by up to a factor of two.

AB - 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 CO2 absorption improved, however, in some cases by up to a factor of two.

KW - IR-57294

U2 - 10.1016/0923-0467(96)80009-1

DO - 10.1016/0923-0467(96)80009-1

M3 - Article

VL - 60

SP - 123

EP - 129

JO - The Chemical Engineering Journal and the Biochemical Engineering Journal

JF - The Chemical Engineering Journal and the Biochemical Engineering Journal

SN - 0923-0467

IS - 1-3

ER -