Purba, Elida and Iriani, Dewi (2017) ABSORPTION OF CO2 FROM MODIFIED FLUE GASES OF POWER GENERATION TARAHAN CHEMICALLY USING NaOH AND N¬a2CO3 AND BIOLOGICALLY USING MICROALGAE. Proceeding of International COnference on Biomass 2017, 1 (1). (In Press)

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Abstract

Abstract This research is carried out on the absorption of CO2 from the modified flue gases of power generation Tarahan using NaOH (sodium hydroxide) and Na2CO3 (sodium carbonate). The operation was conducted in a packed column absorber and then the output gases from the packed column was fed into photo-bioreactor for biological absorption. In the photo-bioreactor, two species of microalgae, N. occulata and T. chuii, were cultivated to both absorb CO2 gas and to produce biomass for algal oil. The aim of this research is, first, to determine the effect of absorbent flow rate on the reduction of CO2 and on the decrease of output gas temperature, second, to determine the characteristics of methyl ester obtained from biological absorption process. Flow rates of the absorbent were varied as 1, 2, and 3 l/min. The concentrations of NaOH and Na2CO3 were 1 M at a constant gas flow rate of 6 l/min. The output concentrations of CO2 from the absorber was analyzed using Gas Chromatography 2014-AT SHIMADZU Corp 08128. The results show that both of the absorbents give different trends. The absorption using NaOH can be concluded that the higher the flow rate the higher the absorption rate. The highest flow rate gives maximum absorption of 100%. On the other hand, absorption with Na2CO3 gives the opposite trend where the higher the flow rates the lower the absorption rate. The highest absorption using Na2CO3 is obtained with the lowest flow rate, 1 l/min, that is 45,5%. As the effect of flow rate on output gas temperature, the temperature decreases with increasing flow rates for both absorbents. The output gas temperatures for NaOH and Na2CO3 are consecutively 35 oC and 31 oC with inlet gas temperature of 50oC. Absorption of CO2 biologically gives a reduction of CO2 up to 60% from the input gas concentration. Algal oil is extracted with mixed hexane and chloroform to obtain algal oil. Extracted oil was transesterified to methyl ester using sodium hydroxide as a catalyst. The results of in-situ transesterification method cannot be identified. Both of microalgae give maximum yield at 2% catalyst concentration. Nannochloropsis occulata gives the highest yield that is 88.5%. The highest content of methyl ester from Nannochloropsis occulata is undecanoic acid methyl ester by 55.42% and the result from Tetraselmis chuii is palmitic acid methyl ester by 81.58%.

Item Type: Article
Subjects: T Technology > TP Chemical technology
Divisions: Fakultas Teknik (FT) > Prodi Teknik Kimia
Depositing User: ELIDA PURB
Date Deposited: 16 Nov 2017 04:50
Last Modified: 16 Nov 2017 04:50
URI: http://repository.lppm.unila.ac.id/id/eprint/5486

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