Quench-box assembly for hydroprocessing reactors

A process for mixing quench gas and vapor-liquid effluent by a quench box assembly, said process comprising:

• a) providing a swirling motion by a swirling section to the incoming fluid from previous bed and quench gas from a ring shaped quench pipe having apertures;
• wherein swirling section is having baffles inclined at an angle preferably between 30 to 60° corresponding to the incoming gas-liquid mixture;
• b) impinging the fluid from the swirling section on a plate and splashing around the mixing chamber for obtaining gas-liquid mixture and attaining equilibrium temperature;
• c) flowing the gas-liquid mixture obtained in step (b) through the weir located at the centre of mixing chamber on the perforated plate;
• wherein the plate is solid at the centre below the weir outlet and having aperture and a circular baffle;
• d) creating turbulence by the circular baffle and increasing the residence time of the gas-liquid mixture on the perforated plate;
• and
• e) flowing the gas-liquid mixture in downward direction from open sides of the perforated plate to a distributor plate.