Division BAT 86: In order to recover solvents and to reduce emissions of organic compounds to air from all units other than the hydrogenation unit, BAT is to use an appropriate combination of the techniques given below. In the case of using air in the oxidation unit, this includes at least technique d. In the case of using pure oxygen in the oxidation unit, this includes at least technique b. using chilled water.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| Process-integrated techniques | |||
| a. | Optimisation of the oxidation process | Process optimisation includes elevated oxidation pressure and reduced oxidation temperature in order to reduce the solvent vapour concentration in the process off-gas | Only applicable to new oxidation units or major plant upgrades |
| b. | Techniques to reduce solids and/or liquids entrainment | See Section 12.1 | Generally applicable |
| Techniques to recover solvent for reuse | |||
| c. | Condensation | See Section 12.1 | Generally applicable |
| d. | Adsorption (regenerative) | See Section 12.1 | Not applicable to process off-gas from oxidation with pure oxygen |
Table 11.1
BAT-AELs for emissions of TVOC to air from the oxidation unit
| The BAT-AEL does not apply when the emission is below 150 g/h. | |
| When adsorption is used, the sampling period is representative of a complete adsorption cycle. | |
| In the case of significant methane content in the emission, methane monitored according to EN ISO 25140 or EN ISO 25139 is subtracted from the result. | |
| Parameter | BAT-AELf1(daily average or average over the sampling period)f2(no correction for oxygen content) |
|---|---|
| TVOC | 5–25 mg/Nm3 f3 |
The associated monitoring is in BAT 2.
Annotations
Footnotes
- f1
-
The BAT-AEL does not apply when the emission is below 150 g/h.
- f2
-
When adsorption is used, the sampling period is representative of a complete adsorption cycle.
- f3
-
In the case of significant methane content in the emission, methane monitored according to EN ISO 25140 or EN ISO 25139 is subtracted from the result.