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Concept
Structured packing
Summary
The term structured packing refers to a range of specially designed materials for use in absorption and distillation columns and chemical reactors. Structured packings typically consist of thin corrugated metal plates or gauzes arranged in a way that force fluids to take complicated paths through the column, thereby creating a large surface area for contact between different phases.
Structured packing is formed from corrugated sheets of perforated embossed metal, plastic (including PTFE) or wire gauze. The result is a very open honeycomb structure with inclined flow channels giving a relatively high surface area but with very low resistance to gas flow. The surface enhancements have been chosen to maximize liquid spreading. These characteristics tend to show significant performance benefits in low pressure and low irrigation rate applications.
Structured packings have been established for several decades. The first generation of structured packing arose in the early 1940s. In 1953, a
patented packing appeared named Panapak, made of a wavy-form expanded metal sheet. The packing was not successful, due to maldistribution and lack of good marketing. The second generation appeared at the end of the 1950s, with highly efficient wire mesh packings, such as Goodloe, Hyperfil and Koch-Sulzer. Until the 1970s, due to their low pressure drop per theoretical stage, those packings were the most widely used in vacuum distillation. However, high cost, low capacity and high sensitivity to solids have prevented wider utilization of wire mesh packings.
Corrugated structured packings, introduced by Sulzer by the end of the 1970s, marked the third generation of structured packed columns. These packings offer high capacity, lower cost, and less sensitivity to solids, while keeping a high performance. Popularity of the packings grew in the 1980s, particularly for revamps in oil and petrochemical plants. These structured packings, made of corrugated metal sheets, had their surfaces treated, chemically or mechanically, in order to enhance their wettability.
Official source
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