Division BAT 84: In order to reduce the amount of coke being sent for disposal from VCM plants, BAT is to use a combination of the techniques given below.
United Kingdom
| Technique | Description | Applicability | |
|---|---|---|---|
| a. | Use of promoters in cracking | See BAT 83 | Generally applicable |
| b. | Rapid quenching of the gaseous stream from EDC cracking | The gaseous stream from EDC cracking is quenched by direct contact with cold EDC in a tower to reduce coke formation. In some cases, the stream is cooled by heat exchange with cold liquid EDC feed prior to quenching | Generally applicable |
| c. | Pre-evaporation of EDC feed | Coke formation is reduced by evaporating EDC upstream of the reactor to remove high-boiling coke precursors | Only applicable to new plants or major plant upgrades |
| d. | Flat flame burners | A type of burner in the furnace that reduces hot spots on the walls of the cracker tubes | Only applicable to new furnaces or major plant upgrades |