Division BAT 74: In order to reduce the amount of organic residues being sent for disposal from the TDI plant, BAT is to use a combination of the techniques given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| Techniques to prevent or reduce the generation of waste | |||
| a. | Minimisation of high-boiling residue formation in distillation systems | See BAT 17b. | Only applicable to new distillation units or major plant upgrades |
| Techniques to recover organic material for reuse or recycling | |||
| b. | Increased recovery of TDI by evaporation or further distillation | Residues from distillation are additionally processed to recover the maximum amount of TDI contained therein, e.g. using a thin film evaporator or other short-path distillation units followed by a dryer. | Only applicable to new distillation units or major plant upgrades |
| c. | Recovery of TDA by chemical reaction | Tars are processed to recover TDA by chemical reaction (e.g. hydrolysis). | Only applicable to new plants or major plant upgrades |