Coalbed Methane is an attractive source of energy to mitigate the growing energy demand of India. It is often abbreviated as unconventional source of energy. In this paper two bore hole samples (J/01 & J/02) were collected and characterized for the isotherm studies to know the sorption capacity of the coal. Pure gas isotherm was constructed based on the manomateric method. Pure gas isotherm was constructed in indigenously fabricated setup. Langmuir model was used for the prediction of sorption capacity at particular pressure. Langmuir constants (PL & VL) were calculated using regression analysis. It was found that volume wise CO2 has 2.09 to 2.75 times more adsorption capacity than coal.Once pure gas isotherm was drawn and PL and VL was calculated. Langmuir constants were given as follows: CH4 -VL (scf/ton) of J/01 and J/02 are 227.27 and 454.55 respectively CH4 -PL (psi) of J/01 and J/02 are 128.54 and 173.68 CO2-VL (scf/ton) of J/01 and J/02 are 476.19 1250 respectively CO2-PL(psi) of J/01 and J/02 are 133.33 596.13 Binary mixture of CH4 and CO2 was modelled at different gas mixtures and at pressure of 2000 psi. Multicomponent iterative model (MIA) was proposed using Newton Raphson iteration to study the co adsorption isotherm of CH4 and CO2 at different binary mixtures. It was found that one CO2 mole fraction increases in gas phase. For sample J/01 Enhanced Coalbed Methane (ECBM) recovery will occur after 27.4 % of CO2 in gas phase while ECBM recovery will occur after 13.03% of CO2 in gas phase. Pure component isotherm and co adsorption isotherm is given in figure 1 & 2.