Microsoft Word master thesis report fina doc

 
 
Figure B-1-4: Influents/effluents scheme for naphtha hydrotreating unit during catalysts 
regeneration 
In case of ex-situ regeneration, the catalyst has to be unloaded from the reactor without 
previous coke combustion. 
1.6. Effluents characterization
In this part, each effluent (except products from the process) is the most precisely as possible 
characterized with data available.
Naphtha 
Hydrotreating Unit 
Catalysts 
regeneration 
Fugitive emissions 
NH
3
H
2
O 
N
2
10% wt NaOH 
Air 
Waste vapor
FG / FO 
Combustion gas 
Spent caustic stream 

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1.6.1. Normal operations 
 
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, sulfur compounds 
 
Fugitive emissions are not negligible. They can be estimated thanks to the Average Factor 
Method which is explained in part A of this report. 
Gas relieves 
 
Media 
Gas 
Origin 
Relief valves 
Destination 
Flare and then atmosphere 
Quantity 
? 
Composition 
CO
2
, VOCs, SOx, NOx
 
 
Off-gases 
Media 
Gas 
Origin 
Separator and reflux drums 
Destination 
Sour gas treatment or sulfur recovery units 
Quantity 
Can be known from material balance