OXYGEN trapping in science & industry

2. OXYGEN trapping in science & industry Presented by :niloofar sadatfasih Superwizer:Dr.Ghaziasgar

3. Today’s Overview

4. Introduction of oxygen and its properties : • Landfill gas contains O2 which enters the landfill as the landfill gas is withdrawn. • O2 may get added or introduced in the process of being used in gas dryers.

5. Why O2 Trapping is important in science??

6. Oxygen is a column killer. • in UHP gases, leaks allow O2 to influx against the osmotic gradient. • O2 can enter a gas line at any fitting.

7. GC needs pure N2 gas

8. O2 trap should be installed before the gas line enters the Gc.

9. Reasons to remove O2 in industries??

10. Types of oxygen contaminated natural gas streams Natural gas streams :

11. (LPG) &(LNG) contain some amount of O2 • LPG blending processing with air to reduce its calorific value and achieve air balancing. • Many pipeline specifications require natural gas to contain less than 10 ppm of O2 .

12. O2 is difficult to separate from natural gas. • Technology not available and developed • High cost of such a removal project

13. increase corrosion in pipelines exceed pipeline specifications

14. O2reacts with H2S to form sulfur. 2 H2S + 3 O2 2 H20 + 2 SO2 O2 creates salt in acid gas removal systems and affect the purge streams.

15. O2 cause corrosion in the steel by handling glycol solvents used in drying plants --

16. Benefits of using O2 trap in purification natural gas • Prevent degradation of process Chemicals • decrease corrosion in pipelines • viable • Profitable

17. O2removal sys are rarely employed& usually abandoned or blended to meet pipeline specifications • .

18. What is OXYGEN Trapping ??

19. Oxygenremoval catalyst is : A chemical used in a reaction or process to remove O2 from gas streams like : • N2, H2, Ar • Saturated hydrocarbons • Ethylene • Propylene And more.

20. Removal of oxygen from gas streams.used for the purification of N2, Ar,CO2.

21. Types of O2 trappers catalysts : • Transition metal based deoxidizer (OX-RM) • Hydro deoxygenationcatalyst (OX-HR) • Nickel based deoxidizer (OX-RN)

22. Important examples of oxygen trap

23. Transition Metal Based Deoxidizer OX-RM : • Takes transition metal oxides as the promoter. • Designed for gas without hydrogenation directly • The ineffective deoxidizer can be used through regeneration.

24. OX-RM Properties : • O2-removal active: Min15 ml O2/g deoxidizer • Remaining O2 :Max.0.5ppm • Operation Conditions (with N2-H2 mixed gas reduction activation before usage) : • Temperature : 200℃ • Pressure : 0-6.0MPa • Feedstock gas inlet O2content : Max4000ppm • Space velocity :0.5-3.0 hr

25. EX : Cu-0226 S Contain Recovery Application

26. Hydro deoxygenationCatalyst OX-HR : • Chemical composition :Pd-Al2O3 • Removing O2from nitrogen, hydrogen, and others.

27. Process conditions : • Pressure: 0.1-10MPa • Temperature :100-210 ℃ • Space velocity : 1000-2000 hr-1 • Hydrogen/ Oxygen : >2 V/V • Raw material :Nitrogen oxygen • Activity index :O2 < 10ppm.

28. EX : ( Puristar R0-20) Contain Deoxo cat Application

29. Nickel Based Deoxidizer OX-RN : • Gases without hydrogenation directly. • Use at ambient temperature. • Deoxidation activity : ≥20 mlO2/g deoxidizer • Remaining O2 :≤0.5 ppm

30. Operation (with N2-H2 mixed gas reduction activation before usage) : • Temperature : Room temperature to 200℃ • Pressure :MPa0~2.0 • Feedstock gas inlet O2 content : Max.4000ppm • Feedstock gas inlet dew point : Max.-60℃ • Space velocity :100-300(gas),0.5-3.0(liquid) hr-1

31. DeOxo • Removal of O2 and/or H2 from gas streams. • The by-products generated at H2O and CO2. Regenerator • CuOcatalyst tablet • regenerate removal of O2, CO, H2, • and other industrial gases and liquids.

32. Manganese (II) oxide supported on Celite • Reduce the O2 in N2 streams to 1 ppn • chromatographic suitable • Non catalytic properties • enable to be packed directly into columns.