The processes of hydrocarbon oxidation in a gas medium with a catalyst have been studied. Specific properties of heat and mass transfer of swirling flow of optically active medium consisting of hydrocarbon low-concentration components and air bilaterally irradiated with IR light are shown. Experimental results show that this method of gas purification has high technological and economic efficiency. The design of a new highly efficient multi-tube unit for oxidation of hydrocarbon low-concentration components, developed in accordance with the latest achievements of technology, which can be used in various industries, is proposed.