Structured packing 250Y

Structured packing 250Y is a kind of widely used structured packing  in chemical tower. It has proven excellent performance in columns with diameters up to 15 m. Structured packing 250Y , and it is supplied in sheet metal thicknesses from 0.1 mm up. 

Special features of Structured packing 250Y

• Pressure drop per theoretical stage 0.3-1.0 mbar 

• Pressure drop at 70 -80% fl ooding about 2 mbar/m 

• Minimum liquid load approx. 0.2 m3/m2h

• Maximum liquid load up to more than 200 m3/m2h 

(typically in desorption columns)

Preferred applications of Structured packing 250Y

• Vacuum to moderate pressure

• High pressure in selected applications 

• Increasing capacity of existing tray and packed columns

Typical applications of Mellapak 250Y

• Chemical Ethylbenzene/styrene, tall oil,industry: cyclohexonone/-ol,

air separation

• Petrochemical  Quench columns,industry: C3- and C4

- splitters, xylene splitters

• Refi neries: Vacuum and atmospheric columns

• Absorption: Natural gas drying,CO2- and H2S-absorbers and strippers,

ethyleneoxide absorbers and strippers,acrylonitrile absorbers separation effi ciency

parameter = headpressure p /mbar

Material of Structured packing 250Y:

Stainless steels, SS304, SS316, SS304L, SS316L

Carbon steel

Hastelloy, monel, aluminum, copper-bronze, brass, titanium, nickel

Comparision Structured packing 250Y
To enable comparision of the mass transfer efficiceny of Mellapak
250Y and 250X, a ratio of HETP-250Y/250X of 1.3 has been used, derived from data reported by Sulzer ChemTech. in their marking brochure of Mellapak Structured packing.

Maldistributn factor of the liquid phase for different random and corrugated structured

Packing after Stikkelman and Schultes.