Types of Structured Packing

structured packing is a critical type of tower internal used in distillation, absorption, and extraction processes to enhance mass transfer efficiency. It consists of regularly arranged, uniform geometric structures with high specific surface area, differing significantly from random packing. Below are the main types:

1. Mesh Structured Packing: Made of metal or plastic wire mesh, these packings feature a crisscrossed, corrugated design. The fine mesh creates extensive gas-liquid contact points, offering high separation efficiency, especially for systems with low relative volatility. However, they have lower mechanical strength, making them suitable for low-pressure, low-temperature applications like fine chemical separation.

2. Plate Corrugated Packing: Constructed from metal or plastic plates with alternating 90° or 180° corrugations, this type balances efficiency and capacity. The plate structure provides better liquid distribution and higher throughput compared to mesh packings, with moderate pressure drop. Widely used in large-scale industrial distillation columns for petroleum refining and petrochemical production.

3. Metal Hole Plate Packing: Composed of thin metal plates with uniformly distributed holes, this packing combines plate strength with enhanced liquid flow. The holes reduce flooding risk and improve mass transfer, making it ideal for high-viscosity or fouling-prone fluids. Commonly applied in heavy oil distillation and wastewater treatment processes.

4. Plastic Structured Packing: Lightweight and corrosion-resistant, these packings are made from materials like polypropylene or polyvinyl chloride. They offer good chemical stability, low cost, and easy installation, suitable for corrosive environments in pharmaceutical and food processing industries.

Selecting the right type depends on separation requirements, fluid properties, and operating conditions, ensuring optimal performance and energy efficiency in tower internals.