A gas-liquid reactor for gas-liquid contacting processes can be used in the chemical, petrochemical and other industries, with an advantageous target product output and a plug flow regime. The reactor comprises a housing with an inlet and an outlet for the introduction of reagents and the removal of reaction products. The reactor housing contains a pipe bundle situated such that the space between the pipes does not communicate with the internal volume of the pipes. The reactor housing is also provided with input and output pipes which communicate with the space between the pipes for the supply of a coolant or heat-carrier. A rod is removably installed in at least one of the pipes. Plates are attached to the rod, each of the plates has at least one opening. The plates are arranged in such a way that the openings of neighboring plates are not coaxial in relation to one another.