ACID CONCENTRATION COLUMN Russian patent published in 2017 - IPC B01D3/32 

FIELD: chemistry.

SUBSTANCE: invention relates to devices used for concentration of solutions of acids, and can be used in different fields of chemical industry, particularly in production and processing of inorganic acids, fertilisers. Acid concentration column includes a composite housing of rings, on which there are working concentration stages, stages for capturing acid vapour and sprays, cover with pipes and bottom with vertical and horizontal channels, with gas (vapour) feed pipe, acid inlet and outlet pipes and contact pipe, located in its upper part with clearance relative to first working stage. Each working stage consists of lower and upper rings, wherein lower ring with pipe to receive acid is made with a plate, on which is mounted a swirler with a cover and tangentially located blades, and upper ring with pipe for discharge of acid is made with flanging, on which is mounted with gaps between planes of plates a contact pipe, wherein gap between contact pipe and plate of overlying stage is 0.1–0.5 times diameter of contact pipe. Plate is equipped with a gas pipe, upper edge of which is located above swirler blades.

EFFECT: technical result is increased range of stable operation with change of flow rates of gas and liquid phases, high efficiency of heat-mass exchange and prevention of fogging of acid in gas emission during concentration.

1 cl, 3 dwg