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98221 WHY DOES GLYCOL INHIBIT CO2 CORROSION?

Picture for 98221 WHY DOES GLYCOL INHIBIT CO2
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Product Number: 51300-98221-SG
ISBN: 98221 1998 CP
Author: Egil Gulbrandsen, Jean-Herve Morard
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C02 corrosion of carbon steel and its inhibition in mixtures of water and ethylene glycol (MEG) or diethylene glycol (DEG) has been studied at 1 bar CO2, 25°C, pH 5 under natural convection conditions. Corrosion rates predicted by the glycol correction factor of DeWaard et al. were in mutual agreement with the experimental results. Analysis of the experimental results shows that the ccmosion inhibitor effect of MEG and DEG can be correlated to changes in solution properties with increasing MEG or DEG concentration, such as decreased CO2 solubility, decreased CO2 diffusivity / increased solution viscosity, decreased water activity and decreased solution polarity. Also described is an impurity related corrosion inhibition that can be very efficient, and possible ways to improve the inhibitor effect of glycol solutions by adding small amounts of inhibitor compounds. Keywords: carbon dioxide, corrosion, glycol, carbon steel, inhibition, viscosity, CO2 solubility
C02 corrosion of carbon steel and its inhibition in mixtures of water and ethylene glycol (MEG) or diethylene glycol (DEG) has been studied at 1 bar CO2, 25°C, pH 5 under natural convection conditions. Corrosion rates predicted by the glycol correction factor of DeWaard et al. were in mutual agreement with the experimental results. Analysis of the experimental results shows that the ccmosion inhibitor effect of MEG and DEG can be correlated to changes in solution properties with increasing MEG or DEG concentration, such as decreased CO2 solubility, decreased CO2 diffusivity / increased solution viscosity, decreased water activity and decreased solution polarity. Also described is an impurity related corrosion inhibition that can be very efficient, and possible ways to improve the inhibitor effect of glycol solutions by adding small amounts of inhibitor compounds. Keywords: carbon dioxide, corrosion, glycol, carbon steel, inhibition, viscosity, CO2 solubility
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10188 Effect of Triethylene Glycol on Corrosion of Carbon Steel in H2S, CO2, and O2 Environments

Product Number: 51300-10188-SG
ISBN: 10188 2010 CP
Author: A.M. Sherik, A.L. Lewis, A.H. Rasheed, and A.A. Jabran
Publication Date: 2010
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Periodic cleaning of sales gas lines often yields large quantities of material known as black powder. This paper describes a research study that was conducted to provide estimates for corrosion rates of carbon steel in TEG-water mixtures with TEG content in the range 0.0 wt% to 99.5 wt%.
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06442 POSSIBLE GLYCOL CORROSION IN NOMINALLY DRY GAS PIPELINES

Product Number: 51300-06442-SG
ISBN: 06442 2006 CP
Author: John S. Smart, III, Randy Roberts
Publication Date: 2006
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Pipeline quality gas is normally dried in Triethylene Glycol (TEG).  This paper explores how TEG vapor can exist in a pipeline in a similar manner to water, and possibly lead to corrosion. TEG vapor can condense at long distances down a gas pipeline as the line cools.
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00498 CORROSION OF CARBON STEELS IN MONOETHYLENE GLYCOL

Product Number: 51300-00498-SG
ISBN: 00498 2000 CP
Author: J.J. Gonzfilez, M.E. Afonso, G. Pellegrino
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