Carbon dioxide removal in emulsion liquid membrane containing 2-amino-2-methyl-1-propanol /monoethanolamine

Absorption using aqueous alkanolamine is commonly used in industry to remove the carbon dioxide. However it has several weaknesses such as corrosion problem and low absorption rate. Emulsion liquid membrane is introduced as an alternatives method for CO2 absorption because it can reduce the corrosion problem and the formation water droplets creates large interfacial area for absorption to occur. 2-amino-2-methyl-1-propanol (AMP) and monoethanolamine (MEA) present in the aqueous phase in the form of aqueous droplets, surrounded by the organic solution to form water in oil (w/o) emulsion. In this study, effects of amines ratios and amine quantities, and emulsification time and speed on the ELM stability and CO2 absorption were investigated. The ELM was prepared by homogenizing the aqueous and the organic phases. AMP and MEA were added into sodium hydroxide (NaOH) solution to form aqueous solution, and kerosene and Span-80 were mixed to form the organic solution. The absorption study was carried out in rotating disc contactor (RDC) column. A mixture of 12 v% MEA, 4 v% AMP in 100 ml aqueous solution and 8 v% Span-80 in 100 ml organic phase has high stability and can remove 60% of CO2. The stability of the emulsion remained high even after the absorption. This study proved that ELM has the potential to remove CO2 by using only small amount of amines

2-amino-2-methyl-1-propanol as additive to enhance carbon dioxide removal by monoethanolamine emulsion liquid membrane

Aqueous Monoethanolamine (MEA) is widely used as the Carbon dioxide (CO2) absorbent in process industries. Recent technology has shown that a mixture of MEA with other amines can enhance its capability as CO2 absorbent. The addition of 2-amino-2-methyl-1-propanol (AMP) into aqueous phase containing MEA was reported in this study. The aqueous solution was homogenized with the organic solution containing kerosene and Span-80 to produce Emulsion Liquid Membrane (ELM). Rotating disc contactor was used in the CO2 absorption process to maintain the stability of the emulsion. 55.17% of CO2 was removed when 8 mL of MEA was used in the aqueous phase whereas when 8 mL AMP was used, only 41.72% of CO2 was removed. On the other hand, CO2 percentage removal increased to 60.72% when 2 mL of AMP was added into the ELM that containing 6 mL of MEA. Stability of the MEA/AMP mixture ELM after 24 h was 89%. The results indicate that a mixture of MEA/AMP is stable and can enhance the CO2 removal

Removal of carbon dioxide using water-in-oil emulsion liquid membrane containing triethanolamine

Liquid membranes are emerging as solid, liquid and gaseous extractors, replacing the conventional methods of separation for metals, enzymes and gases. For carbon dioxide separation, amine based chemical absorption have been commercially used because of their ability to form complexes at moderate temperature. However, the use of chemical absorption using aqueous amine can caused corrosion. Emulsion liquid membrane becomes an alternative to reduce the contact between the amines and metal surfaces. This paper discusses the preparation of emulsion liquid membrane using triethanolamine (TEA) as an extractant to remove carbon dioxide. The emulsions were prepared by varying the concentration of the extractant and the surfactant, in order to obtain a stable emulsion that can effectively remove carbon dioxide from gas mixtures. High speed homogenizer was used to produce micro-sized emulsion that can increase the mass transfer of carbon dioxide from the gas phase to the liquid phase. It was found that the optimum amount of surfactant (Span 80) in the organic phase and extractant (TEA) in the aqueous phase to produce stable emulsion is 6 vol %. A stable micro-sized emulsion was produced at a stirring speed of 20,000 rpm for 3 hours. This emulsion liquid membrane can remove 88 % of the carbon dioxide introduced into the rotating disc contactor