strategies for managing contaminant metals in the fcc unit · strategies for managing contaminant...
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![Page 1: Strategies for Managing Contaminant Metals in the FCC Unit · Strategies for Managing Contaminant Metals in the FCC Unit RefComm Galveston – May 2017 Rebecca Kuo, Technical Service](https://reader030.vdocument.in/reader030/viewer/2022040601/5e927ccd58990a17dc15f67a/html5/thumbnails/1.jpg)
Strategies for Managing Contaminant Metals in the FCC UnitRefComm Galveston – May 2017
Rebecca Kuo, Technical Service Engineer
1
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Agenda
� Feedstock variations
� Contaminant metals and their effects
�Case studies
�Mitigation strategies
� Advanced passivation technologies
2
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Diverse FCC Feeds
� Residue-containing and
tight oil feeds have
become much more
prevalent in FCC
� Resids typically contain
high Ni, V, CCR, N
� Tight oils typically
contain high Fe, Ca, Na
3
Feed Property
GlobalAverage
GlobalMinimum
GlobalMaximum
API 24.0 10.4 31.7
CCR, wt% 1.5 0.02 8.87
Ni, ppm 2.3 0 13
V, ppm 2.7 0 15
Fe, ppm 4.8 0 35
Na, ppm 1.3 0 6
Basic N, ppm 377 5 1058Oil Quality Variability
from One Field
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Resid
Gasoil
Chart Legend
Gasoil-Resid Unit Split
� Resid >3000 ppm ecat Ni + V; Gasoil <3000 ppm ecat Ni + V
� Globally, more units are processing resid with the average moving from ~40%
resid in the early 2000s, to today ~50%
59 62 60 62 62 63 61 62 57 52 55 49 48 50 51
41 38 40 38 38 37 39 38 43 48 45 51 52 50 49
0
20
40
60
80
100
% O
F T
OTA
L
4
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Feedstock Contaminant Effects
� Why do we care about metal contaminants?
� Metal contaminants are harmful to the catalyst and can cause unwanted reactions
in the FCCU
� The metals deposit on the circulating catalyst and cause competing chemistries to
the desired reactions
� Salts (Na, Ca, Mg) act as a base and attack the acid sites on the catalyst, lowering
activity and conversion
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Elements of Concern
6
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Elements of Concern: Nickel
7
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Nickel Sources & Effects
� Ni comes in with the feed and deposits
on catalyst particles
�Undergoes redox cycles
�Nickel oxides do not migrate
8
� Catalyst activity is not significantly
affected
� Ni acts as a dehydrogenation catalyst
0%
50%
100%
0
20
40
60
0-1 1-2 2-3 3-4 4-5 5-6 >6
Fre
qu
en
cy,
%
Ni, ppm
Feed Ni Histogram
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9
6000
7000
8000
9000
10000
11000
Ni, p
pm
Ecat Ni
1.10
1.30
1.50
1.70
FD
GF,
v/v
Fluidized Dry Gas Factor
1.00
1.20
1.40
1.60
1.80
FC
F,
wt/
wt
Fluidized Coke Factor
Nickel EffectsCase Study
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Nickel Mitigation Strategies
� Typically, Ni becomes a concern >800 ppm on the ecat
� Some refiners use antimony (Sb) injection to passivate Ni
� Can increase NOx emissions
� Can increase bottoms fouling
� A more permanent solution is to use catalyst with specialty alumina (such as Flex-Tec)
� Ni deposits on alumina and becomes passivated
10
0
0.05
0.1
0.15
0.2
0.25
0.3
0
1000
2000
3000
4000
5000
6000
7000
Time
AC
E H
2, w
t%
Ecat
Ni an
d S
b(x
10),
pp
m
Ni
Sb
H2
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Elements of Concern
11
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Elements of Concern: Vanadium
12
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Vanadium Sources & Effects
� Vanadium comes in with the feed and
deposits on the catalyst particle
� V is converted into an oxide
�V is very mobile – can migrate from
particle to particle & within the
particle
� Destroys zeolite, especially in the
presence of high Na
� V causes significant reduction in activity
and has some dehydrogenation activity
13
0%
20%
40%
60%
80%
100%
05
1015202530
Fre
qu
en
cy,
%V, ppm
Feed V Histogram
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Vanadium EffectsCase Study
14
656769717375777981
FA
CT, w
t%
Ecat FACT
4,000
5,000
6,000
7,000
8,000
9,000
V, ppm
Ecat Vanadium Content
60
70
80
90
0 2000 4000 6000 8000 10000 12000FA
CT,
wt%
V+Na, ppm
Ecat FACT vs V + Na
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Vanadium Mitigation Strategies
� Typically, V becomes a concern >1500 ppm on ecat
� Refiners can use a V-trap additive to passivate
�Can be REO, Ca, or Ca/Mg based
�Can be added separately or blended into the catalyst
formulation
� Because the effect of V is exaggerated with high Na, use a low-Na fresh catalyst
� Increase catalyst additions or use purchased catalyst to flush out the V in the
circulating inventory
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Elements of Concern
16
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Elements of Concern: Sodium
17
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Sodium Sources
� Sodium comes from various sources:
� Fresh catalyst – typically between
0.15-0.3 wt%
� Feed – deposits on the surface of
catalyst particle
– Does not migrate within the
particle or to other particles
18
0%
20%
40%
60%
80%
100%
0
10
20
30
40
50
Fre
qu
en
cy,
%
Na, ppm
Feed Na Histogram
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Sodium Effects
19
� Na acts as a permanent catalyst
poison
�Neutralizes acid sites
�Also forms a low melting point
eutectic with vanadium to lower
ecat activity and conversion
�Activity loss exaggerated when
ecat V and regen temps are also
high
� Ca and K have similar effects
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Sodium Mitigation Strategies
� Employ low-Na fresh catalyst
� Improve and optimize desalter operation –
remove Na from the feed
� Increase catalyst additions or use purchased
catalyst to flush Na out of circulating
inventory
� Increase fresh catalyst activity to combat
activity loss from Na
20
2
4
6
8
10
12
14
16
18
0
2
4
6
8
10
12
Feed
Na, p
pm
Cat
Ad
ds,
tpd
Time
Feed Na Catalyst Additions
69
70
71
72
73
74
75
76
0.2
0.25
0.3
0.35
0.4
0.45
FA
CT
, w
t%
Ec
at
Na
, w
t%
Time
Ecat Na FACT
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Elements of Concern
21
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Elements of Concern: Iron
22
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Iron Sources
� Fe comes from various sources:
� Fresh catalyst – typically between 0.25-0.75 wt%
– Incorporated within the silica/alumina
framework � does NOT impact surface
accessibility or side chemical reactions
�Organic Fe from the feed
� Inorganic Fe from equipment corrosion
� Refiners should focus on “Added Fe” which
deposits on the catalyst surface
� Fe(Added) = Fe(Ecat) –Fe(Fresh)23
Fe(Added)
Fe(Fresh)
Equilibrium Catalyst
0%
50%
100%
0
20
40
0-1 1-2 2-3 3-4 4-5 5-6 >6F
req
uen
cy,
%
Fe, ppm
Feed Fe Histogram
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Iron Effects
Physical Effects
� Surface nodule formation, which has been reported to
cause catalyst circulation issues
� Vitrification on catalyst surface, loss in surface area
� Severe poisoning leads to surface blockage and reduced conversion and
high slurry yield with non-BASF catalyst
�Slurry density becomes unusually light due to uncracked feed
24
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Iron Effects
25
Chemical Effects
� Dehydrogenation: some refiners have reported increased H2 make
� Transfers S from reactor to regenerator for increased SOx
� Acts as a CO promoter: can be an issue in partial-burn units
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old new
old
Added Fe: 0.93 wt%
Al Fe
Iron Imaging: Iron deposits on the surface of the catalyst
� Fe deposits on the catalyst surface, with formation of very
clear surface nodules.
� Old and new catalyst particles can be easily distinguished
� Dissimilar iron coating on each catalyst � indicative of limited
mobility from one catalyst particle to another.26
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Fe EffectsCase Study #1
� Resid unit in Middle East
� Using non-BASF catalyst
� Feed API: 16 – 19
� Ecat Ni: 6200 ppm; Ecat V: 5100 ppm
27
0.10
0.30
0.50
0.70
0.90
55
65
75
Eca
t A
dd
ed
Fe
,
wt%
Un
it C
on
ve
rsio
n,
vo
l%
Unit Conversion and Added Fe versus Time
Added Fe
Conversion
Time (7 months)
� Added Fe increased from 0.23 to 0.43 wt%
� Resulted in a conversion loss of 4 vol%
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Fe EffectsCase Study #2
� R2R unit in Asia Pacific
� Feed API: 21 – 26
�Ecat Ni: 2200 ppm
�Ecat V: 2000 ppm
� Long history of using BASF catalyst since
2002
28
� Refiner started processing high-Fe
feed
� Ecat Fe increased up to 1.3 wt%
(or Added Fe of 0.7 wt%)
� Noticed change in color of the ecat
around ~0.2 wt% added Fe
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Fe EffectsCase Study #2
� Added iron increase from 0.15 to 0.70 wt% with no loss in unit conversion
� During the same period, other contaminants (Ni, V) decreased / stayed same
2929
00.10.20.30.40.50.60.70.8
55
60
65
70
75
80
85
Ad
de
d F
e (
wt%
)
Un
it C
on
ve
rsio
n
(wt%
)
Unit Conversion and Added Fe versus Time
Time (7 months)
Conversion
Added Fe
Result: No detrimental impact on unit conversion and yields at significantly high
Added Fe
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Iron Mitigation Strategies
� Employ fresh catalyst with optimized surface porosity
� Increase catalyst additions or use purchased catalyst to flush Na out of circulating
inventory
30
Surface Pores Minimal Optimized
Diffusion of feed poor excellent
Threshold to added Fe Low (e.g. 0.3 wt%) High (e.g. >1.5 wt%)
Resulting liquid yield low high
Added Fe
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Mitigation strategies should make sense!
� Design of the catalyst passivation technology: passivator mobility should complement metal’s
mobility
31
V
Ni
MetalMetal
mobilityPassivator
mobilityPassivatortechnology
Mobile
Immobile
Immobile
Immobile
Mobile
REO or separate particle
Specialty Alumina
Boron Based Technology
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Mitigation Strategies – Boron-Based Technology (BBT)
� New BASF catalyst technology designed to passivate Ni
� Boron is mobile under FCC conditions and migrates to Ni on the catalyst
32
Ni B
B deters Ni from being reduced to a more
detrimental state in the riser
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BOROCAT™ Reduces Hydrogen and Coke in the FCCU
33
� BoroCat™: lower hydrogen, lower coke, higher liquid products
� Catalyst architecture modifications allow for dramatic alleviation of constraints
Ecat H2/C1 vs. Eq. Ni Ecat Coke Factor vs. Eq. Ni
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Mitigation Strategies Summary
34
Nic
ke
l
• Employ catalyst incorporated with specialty alumina
• Boron-based technology
• Antimony (Sb) injection
Va
na
diu
m • Employ catalyst designed for high V –high REO, stable zeolite
• Employ low-Na fresh catalyst
• Incorporate V-trap additive
So
diu
m • Employ low-Na fresh catalyst
• Efficient and optimized desalteroperation
Iro
n • Employ catalyst with optimized surface porosity
• Use of purchased catalyst to lower ecatFe
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Mitigation Strategies Summary
35
Feed Metal Deposition Method Primary Effect Secondary Effect What to Watch for in the Unit
Solutions
Vanadium Deposits evenly and migrates in the regenerator
Permanent catalyst poison
Dehydrogenation agent
• Increased H2 and coke production
• Decreased catalyst activity
• V-trap additive• Flush catalyst
Sodium Deposits evenly and does not migrate
Permanent catalyst poison
Forms eutectic with V
• Decreased catalyst activity
• Flush catalyst• Catalyst change• Optimize desalter
operation
Nickel Deposits and binds on the outside of the particle. Does not migrate
Dehydrogenation agent (creates coke and H2)
-- • Increased H2 and cokeproduction
• Antimony injection• Catalyst change• Flush catalyst
Iron Deposits and binds on the outside of the particle. Low mobility between particles
Creates nodules on the surface of the particle at very high levels
Dehydrogenation agentCO promotionTransfers S from reactor to regenerator
• Circulation issues and lower ABD
• Over-promotion in partial burn units
• Slightly increased SOxemissions
• Flush catalyst• Catalyst change
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Additional Feed Contaminants
36
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Additional Feed Contaminants
37
Elements of high concern to be discussed in this presentation
Elements of concern to be mentioned briefly in this presentation
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Additional Feed Contaminants
38
Comes in with feed or some V-trap additives
Neutralizes acid sites (less active than Na); can also plug pores in combination with high added Fe
Use flush catalyst or employ catalyst with optimized surface porosity
Calcium
Comes in with feed
No negative effects on conversion or yields
Use hydrotreatingor gasoline sulfur additives to remove for environmental purposes
SulfurUsed in some V-traps or chemicals for tight oil extraction
Has no effect on catalyst activity or yields when REO is present
Barium
Comes in with feed
Volatile at FCC conditions and does not stay on the FCC catalyst
Arsine (AsH3) does go out with the C3= stream which must be treated
Arsenic
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Additional Feed Contaminants
39
Comes with feed and poor desalteroperation
Re-disperses and reactivates “old” metals on the catalyst, especially Ni
Use low-Cl catalyst or flush catalyst to remove from inventory
ChlorineUsed to stabilize zeolite – typically an indicator of ZSM-5 additive
Can also be used in chemicals for tight oil extraction – no effect on activity
Phosphorus
Comes in with feed or NOx reduction additives
Has 5x more dehydrogenation activity than Ni
Use low-Cu promoter such as CONQUERNOX
CopperComes in with feed and neutralizes acid sites, lowering conversion
Temporary poison – burns off in the regenerator as coke
(Basic) Nitrogen
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Summary: Metals Contamination in FCC
�Metals are continuing to rise as we see increased resid
processing as a global trend
�Ni, V, Fe, and Na among the most detrimental, with Ca, K,
Cu also of concern
�Catalytically: employ catalyst designed for high metal
applications including metal passivators, REO, and
optimized surface porosity
�Proper operational and catalytic mitigation strategies
enable stable operation and profitability at the refinery
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