OXYGEN TRAPPING IN SCIENCE

& INDUSTRY

Presented by :niloofar sadat fasih

Superwizer:Dr.Ghazi asgar

•Introduction of oxygen and its properties:

1

•Why O2 Trapping is important in science ??

2

•Reasons to remove O2 in industries??

3

Today’s Overview

•What is OXYGEN Trapping ??4

•Important examples of oxygen trap

5

•References6

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contains O2 which enters the landfill as the landfill gas is withdrawn.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.

Why O2 Trapping is important in science??

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.

GC needs pure N2 gas

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

Reasons to

remove O2 in

industries??

Types of oxygen contaminated natural gas streams

Vacuum

system

• landfills• Vacuum oil

recovery systems

• Coal mine (gob gas) methane

Traditional

pipeline

systems

• May contain only 100 ppm of oxygen

Natural gas

streams :

(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 .

O2 is difficult to separate from natural gas.

• Technology not available and developed • High cost of such a removal project

increase corrosion in pipelines exceed pipeline specifications

2 H2S + 3 O2 2 H20 + 2 SO2

1) O2 reacts with H2S to form sulfur.

2) O2 creates salt in acid gas removal systems and affect the purge streams.

3) O2 cause corrosion in the steel by handling glycol solvents used in drying plants

--

Benefits of using O2 trap in purification natural gas

Prevent degradation of process Chemicals

decrease corrosion

in pipelinesviable Profitable

O2 removal sys are rarely employed& usually abandoned or blended to meet pipeline specifications

Lack of O2

removal system

High capital costs

Lack of industr

ial experti

se

Limited O2

removal range

What is OXYGEN Trappin

g ??

Oxygen removal catalyst is :

A chemical used in a reaction or process to remove O2 from gas streams like :N2, H2, ArSaturated hydrocarbonsEthylenePropyleneAnd more.

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

Adsorbents for O2 Removal

Metal catalysts

Mixed-metal catalysts

Types of O2 trappers catalysts:

Transition metal based deoxidizer (OX-RM)

Hydro deoxygenation catalyst (OX-HR)

Nickel based deoxidizer (OX-RN)

Important

examples of

oxygen trap

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.

OX-RM Properties: • O2-removal active : Min15 ml O2/g

deoxidizer • Remaining O2 :Max.0.5ppmOperation Conditions (with N2-H2 mixed gas reduction activation before usage) :• Temperature : 200℃• Pressure : 0-6.0MPa• Feedstock gas inlet O2 content :

Max4000ppm• Space velocity :0.5-3.0 hr

EX : Cu-0226 SA copper oxide on a high surface area

alumina sphere catalyst.

Can be restored by regeneration

Removing trace quantities of O2 in

inert gases at 25 ℃.( Up

to 90 % )

Contain

Recovery

Application

Hydro deoxygenation Catalyst OX-HR:

• Chemical composition :Pd-Al2O3• Removing O2 from nitrogen,

hydrogen, and others.

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.

EX : ( Puristar R0-20)

Robust , Pd on an alumina carrier.

Removal of O2 and/or

H2 from gas streams. Purification

of N2, Ar , and CO2.

Contain

Deoxo cat

Application

Nickel Based Deoxidizer OX-RN:

• Gases without hydrogenation directly.

• Use at ambient temperature.• Deoxidation activity : ≥20

mlO2/g deoxidizer • Remaining O2 :≤0.5 ppm

Operation (with N2-H2 mixed gas reduction activation before usage):

• Temperature : Room temperature to 200℃• Pressure :MPa 0~2.0• 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

CuO catalyst tablet regenerate removal of O2, CO,

H2, and other industrial gases and liquids.

Regenerator

DeOxo Removal of O2 and/or H2 from

gas streams. The by-products generated

at H2O and CO2.

Reduce the O2 in N2 streams to 1 ppn

chromatographic suitableNon catalytic properties enable to be packed directly

into columns.

Manganese (II) oxide supported on Celite