Comparison of Advantages and Disadvantages of Several Common Chemical Packing

Raschig Ring

Advantages: easy to manufacture, low price, and its research is more sufficient, so in the past a long time has been widely used.

Disadvantages: Because of the large height to diameter ratio, it is easy to form line contact between the packing layers during stacking, so there are often serious trench flow and wall flow phenomenon when the liquid flows in the packing layer. The wettability of the inner surface of the packing is low, so the mass transfer rate is not high.

Pall Ring

Pall ring developed on the basis of raschig ring is a layer or two layers of rectangular holes on the side wall, the base material of the holes does not break away from the side wall but forms an inward curved blade.Compared with raschig ring, Pall ring not only has larger production capacity and lower pressure drop, but also has higher separation efficiency and greatly reduces gully flow phenomenon.

Berl Saddle Ring

Advantages: Compared with the raschig ring, the void ratio is high, the gas resistance is small, the liquid distribution performance is better, the performance is better than the raschig ring.

Disadvantages: The adjacent packing is easy to overlap, which reduces the effective surface of the packing and affects the mass transfer rate. Therefore, the berl saddle packing is quickly replaced by the Intalox saddle ring packing.

Intalox Saddle Ring

The Intalox saddle ring is a kind of asymmetric saddle-shaped packing developed from the arc saddle. The two ends of the saddle packing are rectangular, and the two sides of the packing are different in size. This structure overcomes the disadvantage of arc saddle packing overlapping, and the packing uniformity is improved. Therefore, the liquid distribution is uniform and the gas-liquid mass transfer rate is improved. Ceramic Intalox saddle packing is one of the most widely used porcelain packing.

Structured Packing

Advantages: the gap is large, so the production capacity is large, the pressure drop is small, and because the flow channel is regular, so as long as the initial distribution of liquid is uniform, the distribution is uniform in the whole tower, so the structured packing almost no amplification effect, usually has a high mass transfer efficiency.

Disadvantages: high cost, easy to plug and difficult to clean, so it is generally used in industry difficult to separate or separation requirements are very high.