Packings for e.g. phase exchange columns - are made from suitable substrates covered on one or both sides with carbon@ fibres or flakes which produce strong capillary effect

摘要

A column contains packings inserted for the exchange of materials and/or heat between a gas, at least one liquid and at least one solid phase. The packings used consist of a substrate coated with fibres, flakes or particles of carbon on at least part of its surface. Preferred substrates are stainless steel, ceramics, and extruded polyethylene, polypropylene, PVC or polyvinylidenefluoride. ADVANTAGE - The products are used for adsorption in three (or more) phases (unlike existing systems). This provides a higher degree of effectiveness than hitherto when being used in distillation, rectification, absorption, extraction, drying, humidifying, or for chemical reactions. They enable the height of column used to be reduced. If acid gases are being absorbed a strong buffer effect is produced so that the pH remains in the 6-9 range for longer periods and hence provides a greater absorption of the gas. The effectiveness is high both for hydrophilic and lipophilic liquids.