Pengaruh Rasio Jumlah Resin terhadap Air pada Adsorpsi Gas Karbon Dioksida Menggunakan Resin Komersial

Anies Mutiari, Aswati Mindaryani


Biogas is one of the most promising source of alternative energy, but there is still a problem regarding the reduction of combustion heat due to the level of impurities, i.e. carbondioxide (CO2), which is around 25-45%. One of the most feasible way to reduce the concentration of carbondioxide is adsorption. In this research, adsorption was done using strong base anion exchanger resin, by using Purolite Resin and Dowex Marathon A Resin. Adsorption using this method was done by diluting CO2 in water, where the reaction of forming HCO3- will occur. These HCO3- ions will be adsorbed on the resin surface by means of ion exchange, and the solid-liquid equilibrium was approached by Langmuir method. To increase the solubility of CO2 in water, low temperature variations were used in this research. The amount of resin were also varied in order to understand the optimum composition, the variations of resin to water ratio were 1:3, 1:4 and 1:6. The result shows that the concentration of H2CO3 and HCO3- formed gradually increases over time, yet the concentration of CO2 did not show the same pattern; it decreases until a particular time, and then increases until it approaches its initial concentration due to the effects of system equilibrium. The reaction and adsorption time is also counted as the function of resin-water ratio.


Biogas merupakan salah satu sumber energi alternatif yang sangat menjanjikan, namun permasalahan yang sering muncul ialah berkurangnya panas pembakaran akibat kadar impurities berupa karbondioksida (CO2) yang masih cukup besar, yaitu sekitar 25-45%. Salah satu cara yang cukup baik dan ekonomis untuk mengurangi kadar karbondioksida yaitu dengan cara adsorpsi. Metode adsorpsi dalam penelitian ini menggunakan adsorben berupa Strong Base Anion Exchange Resin dengan jenis Resin komersial Purolite dan Dowex Marathon A. Metode adsorpsi ini menggunakan mekanisme pelarutan gas CO2kedalam air, sehingga akan terjadi reaksi pembentukan ion HCO3-. Ion HCO3-ini akan diserap pada permukaan  resin melalui mekanisme pertukaran ion dengan metode pendekatan kesetimbangan padat cair Langmuir. Untuk meningkatkan kelarutan CO2didalam air maka pada penelitian ini dilakukan variasi resin yang digunakan, yaitu 1:3, 1:4 dan 1:6 dengan tujuan untuk mencari komposisi dengan jumlah resin yang optimum dan ekonomis. Dari hasil percobaan dapat dilihat bahwa pola H2CO3dan HCO3- yang terbentuk selalu meningkat setiap waktu, namun pola konsentrasi CO2 yang teramati menunjukkan penurunan sampai waktu tertentu dan meningkat lagi sampai konsentrasi awalnya akibat kesetimbangan sistem. Selain itu, laju reaksi dan adsorpsi di permukaan resin juga terhitung sebagai fungsi rasio resin terhadap air.


Adsorpsi, kesetimbangan, Langmuir, resin, biogas

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