Diglycolamine solutions

Martin JL, Otto FD, Mather AE (1978) Solubility of hydrogen sulfide and carbon dioxide in a diglycolamine solution. J Chem Eng Data 23 163-164... 

Figure 2-3. High-pressure gas-treating plant using Diglycolamine solution (Fluor Econamine process). Courtesy of Fluor Daniel...

Diethanolamine solutions that are used for treatment of refinery gases typically range in concentration fiom 20 to 25 wt%, while concentrations of 25 to 30 wt% are conunonly used for natural gas purification. Diglycolamine solutions pically contain 40 to 60 wt% amine in water, and MDEA solutiw concentrations may range fiom 35 to 55 wt%. 

Christensen, S. P., Christensen, J. J., and Izatt, R. M., 1983, Enthalpies of Solution of C02 in Aqueous Diglycolamine Solutions, GPA Research Report 83, Project 821, Brigham Young University, Provo, UT, May. 

Figure 3-31. Vapor-liquid equilibrium data for aqueous Diglycolamine solutions at various pressures. (T iaco Otemlcal, 1982f...

Diglycolamine (DGA), is another amine solvent used in the Econamine process (Fig 1-2). Absorption of acid gases occurs in an absorber containing an aqueous solution of DGA, and the heated rich... 

Therefore a special N-containing ether carboxylate was developed [36] with a high melting point ( 90°C) with a good foam and low hard water sensibility. This is obtained by condensation of a fatty acid (e.g., lauric acid) with diglycolamine, followed by carboxymethylation with NaOH and SMCA, washing out of the reaction mixture with a aqueous solution of a strong acid, separation of the oil layer, and neutralization with NaOH or KOH. The result is an ether carboxylate with exactly 2 EO units with the structure ... 

DGA Fluor Econamine diglycolamine 90-130 Not highly sensitive Yes, <4 ppmv COS, CS2 degrades solution Yes, below that normally provided by MEA... 

Stainless steel is used in critical areas where hot carbon dioxide-laden solutions are present. It is reported that antifoam agents (silicones) are used in some cases with this process . Some pressurized wash processes also use diglycolamine to remove sulfur compounds and COj 6. 

This case is similar to that of reaction 1 absorption of A followed by reaction with B in the liquid phase, with the difference that there are now two gases Ai and A2. Typical industrial examples are the reactions of CO2 and H2S with aqueous solutions of diglycolamine and diisopropanolamine, and of isobutylene and butenes with aqueous sulfuric acid. 

Aqueous alkanolamine solutions are frequently used for removal of acidic gases such as carbon dioxide and hydrogen sulfide from gas streams in the natural gas, synthetic, and refinery industries. Several options are available for removing acid gases, but by far the most popular is the absorption by amine based solvents such as monoethanolamine (MEA), diglycolamine (DGA), diethanolamine (DEA), di-isopropanolamine (DIPA), triethanolamine (TEA), N-methyldiethanolamine (MDEA), 2-amino-2-methyl-l-propanol (AMP), and 2-piperidineethanol (2-PE) in reversible absorption-regeneration processes [1]. 

University. The results of these studies are presented in a series of research reports. Research reports RR-8S (Christensen et al., 1985), RR-1Q2 (Merkley et al., 1986), and RR-108 (Helton et al., 1987) provide data on CO2 in aqueous diglycolamine, methyldiethanolamine, and diethanolamine solutions, respectively. Reports RR-114 (Van Dam et al., 1988) and RR-127 (Oscarson and Izatt, 1990) give similar data on H2S in diethanolamine and metfayldietfaanol-amine, respectively. 

Maddox, R. N., Bhairi, A. H., Diers, J. R., and Thomas, P. A., 1987. Equilibrium Solubility of Carbon Dioxide or Hydrogen Sulfide in Aqueous Solutions of Monoethanolamine, Diglycolamine, Diethanolamine and Methyldiethanolamine, Research Report RR-104 to Gas Processors Association, Tulsa, OK, Match. 

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