Structured packing is suitable for caprolactam vacuum distillation because low pressure drop and low liquid holdup help reduce reboiler temperature, thermal degradation and product discoloration. Selection must also address caprolactam crystallization in cold distributors, packing channels, walls and nozzles. Packing surface area, liquid distribution, heat tracing, vacuum stability, heavy-residue control, support-grid drainage and startup or shutdown procedures must be designed as one polymer-grade purification system.

Structured packing improves acetonitrile recovery by providing efficient vapor–liquid contact with low pressure drop and low liquid holdup, but it cannot break the acetonitrile–water azeotrope. Extractive distillation, entrainer-assisted separation, pressure-swing operation, adsorption or membrane treatment may be required for deeper dehydration. Pharmaceutical salts, API residues, particles, batch-to-batch composition changes and cleaning requirements must be addressed before selecting packing geometry, material and distributor design.

Structured packing supports NMP recovery from lithium battery electrode production by combining high mass-transfer efficiency with low pressure drop and low liquid holdup. These properties help maintain vacuum, lower reboiler temperature and reduce solvent degradation. Packing selection must account for feed water content, PVDF and electrode particles, liquid distribution, polymer compatibility, heavy-residue accumulation and the complete NMP reuse specification—not only solvent concentration.

Structured packing can improve formaldehyde absorption by providing high gas–liquid contact area with low pressure drop, but absorber performance is strongly influenced by heat release, circulation rate, liquid distribution and deposit formation. Excessive temperature reduces absorption, while uncontrolled cold spots may promote solids or polymeric deposits. Packing geometry, material, cooling arrangement, distributor design, mist elimination and cleaning access must therefore be engineered as one integrated formalin-production system.

Structured packing can improve acetic acid dehydration through high mass-transfer efficiency, low pressure drop and low liquid holdup, but packing alone cannot solve the high energy demand of very dilute feeds. Direct distillation, azeotropic distillation, extractive distillation and extraction-assisted recovery create different packing requirements. Feed concentration, corrosive impurities, solids, liquid distribution, vacuum performance and reboiler fouling must all be evaluated before selecting packing geometry and material.