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Background. In the world of obtaining adsorbents from the stems and waste of trees, to develop technologies for their activation in order to create opportunities for wastewater treatment from organic substances, scientific justification is needed in the following areas: identification of raw materials for activated carbon; obtaining carbon adsorbents with high sorption properties by various activation methods. Purpose. Studying the isotherm of benzene vapor adsorption on a steam activated carbon adsorbent obtained from the Chinara tree trunk and thermodynamic properties (heat of adsorption, adsorption entropy), adsorption kinetics. Methodology. In laboratory conditions, using a high-vacuum adsorption microclimetric device, the isotherms of benzene vapor adsorption on activated charcoal adsorbent and the thermodynamic parameters were determined Originality. For the first time, the full thermodynamic properties of benzene vapor adsorption by a carbon adsorbent obtained on the basis of a plane tree trunk activated by steam were determined. Findings. The complete thermodynamic characteristics of the adsorption of benzene vapors on the CACH-V adsorbent were determined. The heat of adsorption of benzene at CACH-V at the initial saturation regions, at a=0.14 mol/kg, is 98.05 kJ/mol, and at 101.46 kJ/mol, the maximum value is reached a = 0.52 mol/kg, then the differential heat of adsorption decreases to Qd=63.66 kJ/mol at α=1.47 mol/kg. In the final saturation regions of adsorption in the range α= 2.67-3.86 mol/kg, it was found that the heat of adsorption decreases from Qd = 41.29 kJ/mol to Qd =33.41 kJ/mol. [ABSTRACT FROM AUTHOR]