An internal loop airlift reactor for process intensification integrating reaction and separation, comprising a riser, a downcomer, a solid feed inlet, a hydrocyclone inlet, internals preventing the occurrence of dead zone, a liquid inlet, a gas inlet, a gas outlet, a draft tube, a gas guide cone, vent holes, an overflow pipe, a hydrocyclone, an underflow pipe, a gas-liquid integrated distributor and a liquid outlet, wherein the riser and the downcomer are separated by the draft tube;
- the solid feed inlet is disposed on a side wall of the reactor;
- the liquid inlet and the gas inlet are disposed at the bottom of the reactor;
- the gas outlet is disposed at the top of the reactor;
- a liquid outlet connects the hydrocyclone and the overflow pipe and introduces the clear liquid to the outside of the reactor;
- the hydrocyclone is arranged at the lower part of the downcomer;
- the space between a upper surface of a cylindrical segment of the hydrocyclone and a wall of the downcomer is sealed except for inlets;
- the gas guide cone is arranged on an inner wall of the downcomer;
- the vent holes are designed in the inner wall of the downcomer and arranged below the gas guide cone;
- and the gas-liquid integrated distributor connects both the liquid inlet and the gas inlet and is arranged at the bottom of the riser of the reactor.