At DtEC we design packed columns with a wide range of random packing types, which are supplied in full range of sizes and materials.
Packing Size
The column diameter and packed height for a specific duty is directly related to the packing size irrespective of packing type.
Random packing is supplied in the following common sizes:
| 5/8" | (16mm) | 1" | (25mm) | 2" | (50mm) | 3" | (75mm) |
| 1½" | (40mm) | 2½" | (60mm) | 3½" | (90mm) |
The larger the packing size the smaller the column diameter but taller the packed bed height. For most applications an optimum between the diameter and height is achieved when the 1½" and 2" sizes are used.
For smaller columns, packing size should always be less than one tenth of the column diameter to ensure the distribution quality is not adversely affected.
Packing Materials
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Random packing from DtEC is available in a wide range of materials:
- Metal
- Plastic
- Ceramic
- Carbon
Metal random packing is very robust with no operating temperature restrictions. We supply packing in various grades such as 410S stainless steel, 300 series stainless steels, copper and higher alloys e.g. 904L, alloy C276, alloy 400 and titanium.
Plastic random packing in polypropylene (PPL) with its good chemical resistance and low cost makes it an ideal choice for absorption and stripping applications. Maximum operating temperature is 120ºC.
For higher temperature services a range of fluoro-carbon plastics such as PVDF and PTFE can be used. In addition most plastics can be filled with glass fibre to increase rigidity and density,.
Ceramic random packing is rarely used nowadays except for very specialised systems such as sulphuric acid manufacture.
Carbon random packing (raschig rings) are supplied in various sizes. See relevant section for further details.