Ethanolamine solutions dioxide with

Measure 50 ml of the water sample into each of two 250-ml beakers (if concentration < 10 mg/1 Ca2+ use correspondingly more evaporate to 50 ml) and acidify with perchloric acid (2) (pH 2 - 3). Boil until the carbon dioxide is expelled, and when cool treat with 10 ml of masking solution. Leave the samples to stand for 10 minutes, then add 1 ml of triethanolamine solution and adjust to pH 10.5 with ethanolamine solution (thereby prevent-... 

The presence of carbon dioxide or hydrogen sulphide has no influence on the corrosion resistance of aluminium in ethanolamine solutions. Gas desulphurisation plants have been built with heat exchangers in 3003 [4],... 

One of the principal aspects of refinery gas cleanup is the removal of acid gas constituents, ie, carbon dioxide, CO2, and hydrogen sulfide, H2S. Treatment of natural gas to remove the acid gas constituents is most often accompHshed by contacting the natural gas with an alkaline solution. The most commonly used treating solutions are aqueous solutions of the ethanolamines or alkah carbonates. There are several hydrogen sulfide removal processes (29), most of which are followed by a Claus plant that produces elemental sulfur from the hydrogen sulfide. 

SolubiHty of carbon dioxide in ethanolamines is affected by temperature, amine solution strength, and carbon dioxide partial pressure. Information on the performance of amines is available in the Hterature and from amine manufacturers. Values for the solubiHty of carbon dioxide and hydrogen sulfide mixtures in monoethanolamine and for the solubiHty of carbon dioxide in diethanolamine are given (36,37). SolubiHty of carbon dioxide in monoethanolamine is provided (38). The effects of catalysts have been studied to improve the activity of amines and provide absorption data for carbon dioxide in both mono- and diethanolamine solutions with and without sodium arsenite as a catalyst (39). Absorption kinetics over a range of contact times for carbon dioxide in monoethanolamine have also been investigated (40). 

The carbon dioxide emission has been quantified using the apparatus shown in Figure 1. Under controlled conditions of temperature and relative humidity the emitted carbon dioxide was continuously trapped in a solution of ethanolamine in dimethylformamide (11) and titrated continuously to a preset potential with tetrabutylammonlum hydroxyde in isopropanol. 

Separation of carbon dioxide from combustion products by absorption with aqueous solutions of an ethanolamine (Vol. 4, p. 358, 362)... 

The carbon dioxide may then be. removed by scrubbing with caustic solutions or, preferably, with amines such as ethanolamines. 

The solvents most used in carbon dioxide removal from ammonia synthesis gas can be characterized according to the nature of the absorption process. Chemical absorption, i.e. processes where the carbon dioxide reacts with the solvent by a chemical reaction which is reversed in the solvent regeneration stage, is most often based on the use of alkanolamines, mainly MEA (mono-ethanolamine) [273], or hot solutions of potassium carbonate [274] as solvents. 

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