Structured Packing
| Metal wire gauze structured packing is an important milestone of the development of clear and neat filling. This kind of filling consists of arranged wire mesh pieces pressed into corrugation. Obliquity of corrugation is 45° or 60° and the neighbor two pieces are of opposite directions. When filling into the column, upper and lower filling trays cross by 90. It has advantages of high effectiveness, low pressure drop and large flow rate. The key advantage of wire gauze structured packing is the high separation efficiency even at very small liquid loads along with its low pressure drop and small liquid hold-up, making it very suitable for distillation of thermally sensitive products. Because of the capillary effect, the wire gauze material provides an extremely wettable surface, resulting in excellent mass transfer efficiency, particularly at very low liquid rates. It is typically used for fine chemical distillation when fouling is not a concern. Its applications is often vacuum distillations where the liquid rates are extremely low and minimizing pressure drop is critical. The closely woven wires spread the low liquid flow through capillary action. This arrangement of corrugated gauze material provides the best value when measured on the basis of pressure drop per theoretical stage. |
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| Packing type | Specific surface area m2/m3 | Bulk density kg/m3 | Void volume m3 | Pressure drop per plate Pa/n | HETP mm | Theoretical plate number m-1 | F factor m/s0.5 | Stage height m |
|---|---|---|---|---|---|---|---|---|
| 250 (AX) | 250 | 125 | 0.95 | 10-40 | 100 | 2.5-3 | 2.5-3.5 | 5 |
| 500 (BX) | 500 | 250 | 0.90 | 40 | 200 | 4-5 | 2.0-2.4 | 3-4 |
| 700 (CY) | 700 | 350 | 0.85 | 67 | 400-333 | 8-10 | 1.5-2.0 | 5 |
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