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Purge to the atmosphere  39



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Purge to the atmosphere 


39
 
Figure B-3-6: Influents/effluents scheme for catalytic reforming in regeneration section 
3.6. Effluents characterization
In this part, each effluent (except products from the process and by-products) is the most 
precisely as possible characterized with data available.
3.6.1. Reaction section 
 
Reaction section of the catalytic reforming process does not have any waste effluent. 
Emissions come from fugitive emissions and process heaters.
 
Fugitive emissions 
 
Media 
Gas 
Origin 
Valves, pump seals, flanges, open-ended valves, relief valves, 
compressor seals, drains, sample connections.
Destination 
Diffuse in the atmosphere 
Quantity 
Can be estimated with the Average Factor Method
Composition 
VOCs, HAPs, chlorinated compounds 
 
Fugitive emissions are not negligible. They can be estimated thanks to the Average Factor 
Method which is explained in part A.
The volatile nature of toluene, xylene, benzene and other HAPs which are formed during 
catalytic reforming makes fugitive emissions HAPs largest release source. 
 
Gas relieves 
 
Media 
Gas 
Origin 
Relief valves, reflux drum 
Destination 
Flare or atmosphere 
Quantity 

Composition 
CO
2
, VOCs, HAPs 
Catalytic reforming
Regeneration 
FG / FO 
Combustion gas 
Air 
H
2

C
2
Cl
4
Caustic 
soda 
Caustic purge 
Regeneration loop purge
Lock hopper depressurization
Fugitive emissions / 
Gas relieves 


40
Flue gas from furnaces 

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