Structured packing can improve wet-chlorine drying by providing efficient contact between chlorine gas and concentrated sulfuric acid with low pressure drop. Performance depends on sulfuric-acid concentration, temperature, circulation and uniform liquid distribution. Packing, distributors and supports must withstand wet chlorine, dry chlorine and both concentrated and diluted acid. Gas distribution, acid cooling, mist elimination and startup or shutdown conditions must also be evaluated to protect downstream chlorine equipment.

Structured packing can improve epichlorohydrin purification through high mass-transfer efficiency, low pressure drop and low liquid holdup. Selection must consider water, hydrogen chloride, chlorinated by-products, salts and heavy residues because a material suitable for dry purified epichlorohydrin may not withstand a wet acidic crude stream. Packing geometry, feed pretreatment, decanter operation, liquid distribution, corrosion-resistant internals and heavy-bottom control must be designed together.

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.