Abstract: A turboexpander preferably for cooling natural gas, comprising a casing whose shaft carries operating stages with blades. Provided in the casing in the direction of the gas-liquid flow is at least one separating stage wherein set in succession are a guiding device with a blade pitch smaller than that of corresponding blades of the operating stage, and a runner. The profile of the runner blades has an extended inlet portion with spouts provided on its back. Besides, there is a ring chamber provided in the casing along the periphery of the runner, said ring chamber having a slit for collection of the separated liquid and a branch pipe located in the lower part of the casing.