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Saudi Aramco: Company General Use SPENT CAUSTIC TREATMENT OPTIONS Hadi M. Al-Daghman, 2014.

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Presentation on theme: "Saudi Aramco: Company General Use SPENT CAUSTIC TREATMENT OPTIONS Hadi M. Al-Daghman, 2014."— Presentation transcript:

1 Saudi Aramco: Company General Use SPENT CAUSTIC TREATMENT OPTIONS Hadi M. Al-Daghman, 2014

2 Saudi Aramco: Company General Use Outline  Background  Treatment Options  Most Common Treatment  Conclusion

3 Saudi Aramco: Company General Use What is Spent caustic ? Spent Caustic is the wastewater generated from using Caustic to remove 1.Hydrogen Sulfide (H 2 S) and 2.Mercaptanes (R-SH) from hydrocarbon product stream. BACKGROUND

4 Saudi Aramco: Company General Use Major Sources of Spent Caustic 1.MEROX Processing Unit:  Gasoline  Kerosene  Jet fuel 2.Isomerization Processing Unit BACKGROUND

5 Saudi Aramco: Company General Use Type Of Spent Caustics 1.Sulfidic Spent Caustic 2.Non-Sulfidic Spent Caustic BACKGROUND

6 Saudi Aramco: Company General Use BACKGROUND

7 BACKGROUND

8 Composition of Spent Caustic  Toxic and Highly Odorous  The list below shows typical analytical results:  Chemical Oxygen Demand (COD): 10,000 to 100,000 mg/L  Biochemical Oxygen Demand (BOD): 5,000 to 50,000 mg/L  Total Organic Carbon (TOC): 1,000 to 5,000 mg/L  Sulfides: 5,000 to 35,000 mg/L BACKGROUND

9 Saudi Aramco: Company General Use TREATMENT OPTIONS  Chemical oxidation  Neutralization  Dilution Treatment  Wet Air Oxidation

10 Saudi Aramco: Company General Use CHEMICAL OXIDATION REACTOR SEPARATOR Off Gas to Thermal Oxidizer Oxidized Spent Caustics to Neutralization and WTTP Spent Caustic Feed/Heating Knock Out Drum Cooling Process Catalyst Hydrogen Peroxide

11 Saudi Aramco: Company General Use Advantages of Chemical Oxidation :  Oxidized most of spent caustic Disadvantages :  Very high operating cost  High explosion risks  Requires special handling needs (H 2 O 2 is highly corrosive and degrades in heat) CHEMICAL OXIDATION

12 Saudi Aramco: Company General Use NEUTRALIZATION SEPARATOR STRIPPING COLUMN Fuel Gas Sulfuric Acid Solvent Acid Brine Fresh Caustic Off Gas to Sulfur Plant Spent Caustic Neutralized Brine to WWTP Solvent and Acid oils to fuel oil REACTOR

13 Saudi Aramco: Company General Use Advantages of Neutralization:  Low Operating Cost Disadvantages :  Multiple chemical feed  Complex separation steps  Safety concerns: H2S is generated as a result of the neutralization process  Equipment life reduction: H2S is highly corrosive  Odors Concerns NEUTRALIZATION

14 Saudi Aramco: Company General Use DILUTION Dilution Tank Water Supply Spent Caustic Stream Diluted Caustic to WWTP Routing Sampling

15 Saudi Aramco: Company General Use Advantages of Dilution:  Low capital cost  Lower safety concerns Disadvantages :  Not complete removal (No chemical reactions)  Risk on downstream processes  Very critical operations DILUTION

16 Saudi Aramco: Company General Use WET AIR OXIDATION REACTOR SEPARATOR Off Gas to Thermal Oxidizer Oxidized Spent Caustics to Neutralization and WTTP Spent Caustic Knock Out Drum Cooling Process Oxidation Air Compressor High Pressure Pump Heating

17 Saudi Aramco: Company General Use Advantages of Wet Air Oxidation:  Treat all types of spent caustics  Mostly oxidized the spent caustic  Equipment is highly resistance to corrosion  Low operating and maintenance cost Disadvantages :  Safety concerns is minimal if it is high pressure and high temperature  Consume Energy WET AIR OXIDATION

18 Saudi Aramco: Company General Use THE MOST COMMON SPENT CAUSTIC TREATMENT WAO is the most common Spent Caustics Treatment  The best combination of cost control  Ease of operation and implementation  WAO can treat all type of Spent Caustics at different pressure and temperature.  No byproducts to handle or excess sulfur within off-gas stream  Reuse spent caustic after WAO process

19 Saudi Aramco: Company General Use CONCLUSION  Type of Spent Caustic can determine the best treatment technique.  WAO found to be the most common treatment method to treat all type of Spent Caustics.  Safety factor plays a major role in spent caustic treatment.

20 Saudi Aramco: Company General Use Thank You! Questions?


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