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Naphtha Hydro DeSulphurizer
- NHDS-
Confidential
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Confidential1. Position of NHDS
PENEX
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Overview
NHDS
Raffinate from Sulfolane
Unit 048
FRN from Intermediate
Storage, Unit 152 (NNF)
Makeup H2
from CCR Platforming
Unit 042
FRN from LRU
Unit 011
Makeup H2
from HCDS
(NNF)
Off-Gas to LRU 011
Net Ovhd Liquid to LRU
(C4 Spike case only)
DLN to PENEX
DHN to CCR
Platforming
DSO from Merox
Unit 012/024
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2. Outline Confidential
Licensor : UOP
Capacity : 54100 BPSDTurn down : 50% of Capacity
Feed : Full range naphtha from LRU
Application of Product Oil
- DLN : to PENEX
- DHN : to CCR-PL
- Off Gas : to Fuel gas
- Unstabilized Naphtha : to LRU
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3. Feedstock and Product Properties Confidential
Feedstock Properties
- IBP : 45oC
- FBP : 180oC- PONA : 69.59/0/19.57/10.84 wt%
- SG @ 60oF : 0.721
- Sulphur : 500 ppm wt
- Nitrogen : 1 ppm wt
- Arsenic : < 1ppb wt
- DLN : C7+ < 2% wt
: Benzene < 5% wt
: C4 < 4% LV%
- DHN : Sulphur < 0.5 ppm wt
: Nitrogen < 0.5 ppm wt
: End point < 204oC
: Arsenic < 1 ppb wt
Product Properties
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Confidential4. Reaction Chemistry
1. Conversion of organic sulfur compounds to hydrogen sulfide
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Confidential4. Reaction Chemistry
2. Conversion of organic nitrogen compounds to ammonia
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Confidential4. Reaction Chemistry
3. Oxygen Removal
4. Halide Removal
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Confidential4. Reaction Chemistry
5. Saturation of olefins
6. Metal Removal
Removal of metals is essentially complete, at temperatures above 315°C,up to a metal loading of about 2-3 weight percent of the total catalyst.
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Desulfurization (HDS) Denitrogenation (HDN)
Olefins Saturation
Oxygen removal
Halides removal
Aromatics Saturation
Confidential4. Reaction Chemistry
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Catalyst
Catalyst shapes:
Confidential
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Catalyst
Bed grading strategy:
Confidential
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Catalyst composition:
Catalyst Confidential
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Active
Promoter
Catalyst Confidential
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Catalyst
Key performance criteria:
Activity (required temperature)
Confidential
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Selectivity (desired products)
Stability (coke make)
Catalyst Confidential
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Confidential6. Process variable
1. Pressure:
For straight run naphtha desulfurization, 20 to 35 kg/cm2g
2. Temperature:Minimum reactor inlet temperature is 315°C
3. Feed:
If the sulfur level decreases below 0.15 wt-ppm sulfur,
then sulfur should be injected into the feed.
4. Hydrogen to Hydrocarbon ratio:For straight run naphtha from 40-75 nm3/m3
5. Space velocity:
SRN is processed at 4-12 LHSV
6. Catalyst protection, aging and poisons:Coke ( 5% wt is OK)
Metals ( 2-3% of the catalyst)
Accumulation of deposit on top of the catalyst bed
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Process Variables
1. Temperature
- Major control variable
- Increased throughout cycle to compensate for decreasingcatalyst activity
- Catalyst activity correlates to Average Bed Temperature
Confidential
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Process Variables
- Temperature set by product specifications
- Increasing reactor temperatures will
+ Lower product sulfur
+ Lower product aromatics
+ Higher temperature rise in reactor
+ Higher deactivation rate
+ Lower product Nitrogen and Oxygen
Confidential
f l
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Process Variables
2. Fresh Feed Quality
Confidential
i bl fid i l
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Process Variables Confidential
V i bl C fid i l
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Process Variables Confidential
P V i bl C fid ti l
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Process Variables Confidential
P V i bl C fid ti l
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Process Variables Confidential
P V i bl C fid ti l
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Process Variables Confidential
P V i bl Confidential
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Process Variables
3. Feed rate (LHSV)
Confidential
P V i bl Confidential
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Process Variables Confidential
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Process Variables Confidential
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Process Variables
5. Pressure
Confidential
Catalyst Deactivation Confidential
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Catalyst Deactivation Confidential
7 Corrosion Flow Sheet Confidential
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FRNV-001
RAFFINATE
FRN FROM TANK
V-101
AC-101
H-101R-101
E-101
K-101
V-102
1
25
V-201
7
AC-201
To LRU
AC-203
C-201
54
V-202
23
AC-202
6
1
E-204
E-202
E-201
C-202
E-203
E-205
E-206
From SF
From LRU
FromMEROX
H2 From
Plat
OFF GAS
L.NAPHTA
L.NAPHTA
H.NAPHTA
TO TANK
TO TANK
H.NAPHTA
R E A C T O R
S T R I P P E R
S P L I T T E R
TO PENEX
TO CCR
7. Corrosion Flow Sheet
Water
Sulfide
SWS
Corrosion inhibited
SWS
LPG
To LRU
P-201A/B
P-001A/B
P-202A/B
P-203A/B
- Wet H2S service
- Ammonia Chloride
- Wet H2S service
Confidential
88oC
52oC
126oC
50oC
90oC
164oC
105oC
54oC
40oC
Confidential8 Corrosion Management
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Confidential8. Corrosion Management
1. Water Injection
Purpose:
- Dilute corrosive agents- Prevented fouling ( Ammonia Chloride)
Amount of injection:
- 3% of feed
2. Inhibited Injection
Purpose:
- Protect equipment surface
Amount of injection:
- 5.5 to 6 ppm Wt. in reflux.
Confidential
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Confidential
THANK YOU FOR YOUR ATTENTION
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