unit 040 nhds presentation

8/15/2019 Unit 040 NHDS Presentation

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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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2. Conversion of organic nitrogen compounds to ammonia


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3. Oxygen Removal

4. Halide Removal


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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



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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



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Catalyst

Key performance criteria:

Activity (required temperature)

Confidential


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Selectivity (desired products)

Stability (coke make)



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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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P V i bl C fid ti l


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P V i bl C fid ti l


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P V i bl C fid ti l


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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

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

unit 040 nhds presentation

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