Structured packing is a kind of packing arranged and stacked in accordance with uniform geometry in the tower. The geometry of the whole tower section is regular, symmetrical and uniform, and the gas-liquid flow path is specified, which reduces the phenomenon of channel flow and wall flow, and the pressure drop can be very small. Under the same energy cost and pres?sure drop, it can provide more specific surface area than random packing, and achieve higher mass transfer and heat transfer efficiency in the same volume. In recent decades, structured packing has been widely used in many towers in fine chemical industry, perfume industry, oil refining, fertilizer, petro?chemical industry and other fields.

Structured packings are available in two different inclination angles, i.e. Type “X” and Type “Y” . The “Y” type packings have an inclination angle of about 45º from the horizontal axis,and are the most widely used. The ” X” type packings have an inclination angle of 30 ° from horizontal axis and are used in high capacity and low pressure drop applications.