Structured packing supports TDI vacuum purification through low pressure drop, low liquid holdup and high separation efficiency, helping reduce bottom temperature and thermal degradation. TDI service also requires strict moisture exclusion because water can generate insoluble deposits. Packing geometry, feed cleanliness, residual solvent and acidic contaminants, heavy-bottom withdrawal, reboiler residence time, complete drainage and dry installation must all be evaluated together.

Structured packing can support electronic-grade ammonia purification through high separation efficiency, low pressure drop and low liquid holdup. The system must remove moisture, lubricant oil, noncondensable gases, particles and trace contaminants while preventing recontamination from packing, distributors, piping, storage and sampling equipment. High-pressure hydraulics, small-column wall effects, feed oil separation, surface cleanliness and qualified downstream handling must all be evaluated.

Structured packing can improve green-methanol purification through high separation efficiency, low pressure drop and low liquid holdup. Carbon dioxide hydrogenation can create a high water load together with dissolved gases, dimethyl ether and other oxygenates. Packing and liquid distributors must be designed for minimum, normal and maximum plant loads because variable renewable operation may reduce wetting at turndown. Main rectification, light-end removal and wastewater methanol recovery should be evaluated as separate duties.

Structured packing can improve fractionation of filtered and stabilized plastic pyrolysis oil through low pressure drop, high separation efficiency and low liquid holdup. It may be the wrong choice for raw feeds containing char, wax, reactive olefins and heavy polymer-forming residues. Feed pretreatment, chlorine and water analysis, packing-channel size, distributor cleanability, vacuum performance and deposit-removal strategy must be evaluated before selecting structured packing.

Structured packing can improve refrigerant reclamation through high fractionation efficiency, low pressure drop and low liquid holdup. The design must account for mixed or fractionated refrigerant blends, high-pressure vapor density, close-boiling components, lubricant films, moisture, acids and noncondensable gases. Accurate feed identification, oil separation, small-column liquid distribution, heavy-bottom control and final composition testing are essential for producing a reliable reclaimed refrigerant.