Absorption of CO2 in Biogas with Amine Solution for Biomethane Enrichment

Abstract

Abstract. Biogas upgrading with carbon dioxide absorption in a column of monoethanolamine (MEA) solution was carried out. The effects of controlled parameters on the CO 2 absorption such as gas flow rate, solution concentration, height to diameter ratio of the column were considered. High CH 4 concentration could be achieved at low gas flow rate and high MEA concentration. The CH 4 concentration could be up from 70-75% to 92-95% by volume for 0.2 M MEA. A set of breakthrough curves was obtained to determine the absorption characteristics, such as the absorption constant (k), the absorption time when the CO 2 concentration at the outlet was 50% of the concentration at the inlet (t), and the absorption period (t * ) when the CH 4 concentration was over 90%. An empirical equation of the methane enrichment with the related parameters was developed.

Capturing CO2 from Biogas by MEA (Monoethanolamine) using Packed Bed Scrubber

“…This is due to the greater absorbent flow rate that will make an increase in the interfacial area of packing in the column. This is in line with research conducted by W. Kamopas et al [25] which examined the effect of flow rate and concentration of MEA on gas purification. From his research proved that the rate of solution and the higher concentration of MEA that enters the scrubber can reduce CO2.…”

“…The result of this study CO2 removal efficiency reaches 65% [22]. Next research with size column 780 mm in height and 120 mm in diameter using MEA solution as an absorber increased the CH4 content from 70% to 92% and decreased the CO2 content from 30% to 5% in the biogas by purification [25]. In this study the the packed bed scrubber is made of an acrylic absorption column (64 mm in diameter, 750 mm in height, 500 mm in packing height and 1.5m 3 in capacity).…”

Biogas Upgrading by Capturing CO2 in Non-aqueous Phase-Changing Diamine Solutions

“…There are several technologies that are currently been used to remove CO 2 from biogas, such as chemical and physical absorption, , adsorption, , membrane separations, , and cryogenic separation. , Among these technologies, chemical absorption using aqueous monoethanolamine (MEA) solutions with thermal regeneration of the solvent is often considered as a benchmark technology for CO 2 capture . However, this technology has a major drawback as a result of the high energy penalty for the regeneration of aqueous alkanolamine-based solutions .…”

Time-resolved operando DRIFTS-MS study of the moisture tolerance of small-pore SAPO-34 molecular sieves during CH4/CO2 separation

“…Biogas upgrading is required to separate the CO2 from CH4 and to obtain an enriched biomethane suitable for energetic uses as substitute of the natural gas. In this regard, several technologies such as absorption [6,7] , cryogenic distillation [8,9], membrane separation [10,11] , and adsorption [12,13] are commercially available for biogas upgrading. The separation of CO2 without large energetic costs is highly desirable, and thus the utilization of membranes that preferentially permeate CO2 at high selectivities can significantly reduce the costs of biogas purification [14].…”