Diglycolamine amine solvent

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... 

Alkanolamines. Gas sweetening, ie, removal of hydrogen sulfide and carbon dioxide, using alkanolamines was patented in 1930. Several amine solvents are available as of the mid-1990s. The most widely used are monoethanolamine [141-43-5], diethanolamine [111-42-2], diglycolamine [929-06-6], and methyldiethanolamine [105-59-9]. Amine processes are generally applicable when hydrogen sulfide concentration in the feed gas is relatively low (eg,... 

The most widely used amine is monoethanolamine (MEA), which is considered as a benchmark solvent because of its high cyclic capacity, significant absorption-stripping kinetic rates at low C02 concentration and high solubility in water. Some other amine-based solvents such as diethanolamine (DEA), triethanolamine (TEA), diglycolamine (DGA), N-methyldiethanol-amine (MDEA), piperazine (PZ), 2-amino-2-methyl-l-propanol (AMP) and N-(2-aminoeth-yl)piperazine (AEP) have also traditionally been utilised. 

Amine-based solvents have been enhanced over the years [2], such that primary (Monoethanolamine (MEA) Diglycolamine (DGA)), secondary (Diethanolamine (DEA) Diisopropanolamine (DIPA)) and tertiary (Methyldiethanolamine (MDEA) Triethanolamine (TEA)) variants are available through different suppliers, many of which include special proprietary additives to improve performance and other characteristics. The choice of a particular alkanolamine is primarily dictated by the requirements of the specific application. With the exception of a few, these amines have a maximum sorption capacity of 1 mole of CO2 to two moles of amines. Liquid tertiary amines and amidines have shown a higher sorption capacity with a ratio of 1 1 molar [3], thereby reducing the volume of amine, but the reaction rate is much slower. Amine blends have been used to compensate for this difference in order to reduce regeneration and recirculation costs and increase CO2 loading capacity. 

This concludes the major units in a refinery. There is one major auxiliary unit in a refinery that requires cleaning. This is the amine unit While there are many processes to remove HjS and/or CO2 from gas streams, the most widely used are the amine systems that depend on the reactivity of H2S with amino nitrogen for their absorption properties. The most currently used processes today are monoethanolamine (MEA), diethanolamine (DEA), diglycolamine (DGA), and diisopropylamine (DIPA). Deposits/solvent related to units described above that are not to be considered in more detail are given in Table 1. 

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