Costain Patent Summary · Reference: M. Nawaz & A.J. Finn, “Flowsheet Synthesis and Design of...

June 2016

Costain Patent Summary

Cryogenic NGL Recovery (Ethane+)EP1114808, NO319775

2

Application:

• High C2+ recovery from natural gas

Products:

• Sales Gas & NGL (C2+)

Key Benefits:

• High C2 recovery (98%)

• 100% C3 recovery

• Improvement over existing processes:

– Higher recovery for same power or;

– Same recovery with lower power

– Obtained by good energy integration with multistream exchangers

Expiry Date: 2020

Reference: M. Nawaz & A.J. Finn, “Flowsheet Synthesis and Design of Demethaniser Processes”, GPA

Europe Annual Conference, Berlin 2012

Cryogenic NGL Recovery (Propane+)EP1137616, US6581410

3

Application:

• High C3+ recovery (C2 rejection) from natural gas

Products:

• Sales Gas & NGL (C3+)

Key Benefits:

• Very high C3 recovery (97%)

• Very high C2 rejection (99%)

• 1st High Pressure column increases compressor

suction pressure and reduces power consumption

• Improvement over existing processes:

– Higher recovery for same power or;

– Same recovery with lower power

– Obtained by good energy integration with multistream exchangers

Expiry Date: 2019

Reference: A.J. Finn, T.T. Tomlinson & G.L. Johnson “Design, equipment changes make possible high

C3 recovery, OGJ Jan 2000

Nitrogen Rejection – Medium-High NitrogenGB2455462, EP2433075

4

Application:

• Processing low Calorific Value (CV) natural gas to meet

customer specification (increasing CV through N2 rejection)

• Functions with a wider range of N2 content gas than

traditional double column schemes

Products:

• Sales gas & waste nitrogen stream suitable for atmospheric

venting (very low CH4 content)

Key Benefits:

• Very high hydrocarbon recovery

• Integrated condenser-reboiler

– Low power consumption scheme

• Additional feed stream to low pressure column

– Enables processing of low N2 feed gas (>20 mol%) (traditional double

column >35 mol%)

– Improves separation efficiency

Expiry Date: 2029

Reference: G.L Johnson & D. Wilkinson, “An Abu Dhabi Case Study”, Hydrocarbon Engineering

February 2012

Nitrogen Rejection – Low NitrogenGB2456691, EP2432575, AU2010/227260

5

Application:

• Processing low Calorific Value (CV) natural gas to meet

customer specification (increasing CV through N2 rejection)

• Pre-separation column located upstream of N2 rejection

scheme (double column shown as typical only)

Products:

• Sales gas & waste nitrogen stream suitable for

atmospheric venting (very low CH4 content)

Key Benefits:


• No condenser required for pre-separation column

• Reduction in flow to downstream equipment reduces

equipment size and cost

• Enables processing of low N2 content feed gas

Expiry Date: 2029

Reference: J. Arizmendi-Sanchez & A.J. Finn, “Nitrogen Removal for Chemicals Production”, PTQ

Gas Supplement April 2016

Nitrogen Rejection - High CO2 Tolerance EP2984428, US2016/054054, AU2014/252681

6

Application:

• Nitrogen rejection scheme tolerant of ‘high’ CO2 feed

(<4mol%), surpassing established technologies which can

often be limited to 0.3mol% CO2

Products:

• Sales gas & waste nitrogen stream suitable for

atmospheric venting (very low CH4 content)

Key Benefits:

• High CO2 freezing tolerance

• Can remove/reduce requirement for upstream CO2

removal (eg AGRU)

– Capex/Opex saving

– Reduction in equipment items & footprint

Operating Considerations:

• Feed: < 40 mol% N2

Reference: A. Farooq, A Hosainy, A.J. Finn & G.L Johnson, “CO2 Tolerant Nitrogen Rejection Reduces

Cost”, GPA Florence Sept 15

Expiry Date: 2034

Nitrogen Rejection - LNGGB2462555, EP2507567, US2012/0285196, AU2010/322827

7

Application:

• Nitrogen rejection from LNG to increase fuel gas calorific value

and/or mitigate storage safety concerns (auto-stratification and tank

rollover)

Products:

• LNG to storage, waste nitrogen stream suitable for atmospheric

venting (very low CH4 content)

Key Benefits:

• Very efficient


• Easy integration into new/existing plant

• Low complexity, footprint & cost

• Simple to control

Reference: A.J. Finn, “Nitrogen Removal”, LNG Industry Jan/Feb 2013

Expiry Date: 2029

LNG - ProductionGB2479940, EP2564139, AU2011/247081

8

Application:

• Small scale LNG production

• Floating LNG / small onshore plants

Products:

• LNG to storage

Key Benefits:

• Use of brake compressor for feed gas:

– No requirement for standalone feed compressor

– Beneficial for process integration

– Lower specific power consumption

• Simple operation

• Low equipment count & weight

• Small footprint

Reference: A. Jones & G.L. Johnson, “A New Process for Improved Liquefaction Efficiency”, GPAE

September 2013

Expiry Date: 2030

CO2 - Low Temperature Purification 1GB2489197

9

Applications:

• Carbon Capture from high CO2 production plants

– e.g. Power, cement & steel works etc…

Products:

• High purity CO2 stream and reduced CO2 waste stream

suitable for atmospheric venting

Key Benefits:

• High CO2 recovery (>96%)

• High CO2 purity (>96%) suitable for sequestration

• Simple flow scheme & operability

• Well integrated therefore low power requirement


• Feed composition > 40% CO2

Reference: A.J. Finn et al, “Study of design parameters affecting the performance of CO2 purification

units in oxy-fuel combustion”, 12th November 2012

Expiry Date: 2031

CO2 - Low Temperature Purification 2 GB2490301

10

Applications:



Products:



Key Benefits:


• Very high CO2 purity (99%) suitable for sequestration



• Feed composition >40% CO2



Expiry Date: 2031

CO2 - Low Temperature Purification 3GB2489396

11

Applications:



Products:



Key Benefits:

• Very High CO2 recovery (>98%)

• Very high CO2 purity (>98%) suitable for sequestration






Expiry Date: 2031

CO2 - Low Temp Separation from Hydrogen GB2490476, EP2850375

12

Applications:

• Carbon Capture

– e.g. Reformed natural gas, coal/biomass gasification

Products:

• Very high purity CO2 stream and a H2 rich stream

suitable for combustion

Key Benefits:

• Very high H2 recovery (>99%)

• Very high CO2 purity (>98%)





Expiry Date: 2031



CO2 - Low Temp Separation from HydrocarbonsGB2521177

13

Applications:

• Enhanced Oil Recovery (EOR)

Products:

• Sales gas & CO2 enriched NGL stream

Key Benefits:

• Product CO2/NGL streams:

– Produced at high pressure (minimise CO2 recompression)

– Produced CO2 dry and very low in CH4 (essential for EOR)

• Processes wide range of CO2 feed comp (10% - 70%+)

• Lower cost, solvent recycle & downstream processing (2

dissimilar feed streams) vs existing technologies e.g. Ryan

Holmes


• CO2/NGL liquid streams to be further fractionated to separate

the CO2 and NGL (both with low CH4 content)

Reference: T.R. Tomlinson, A.J. Finn, M. Nawaz, “Enhancing Oil Recovery, Oilfield Technology”, Dec 2015

Expiry Date: 2033

Costain Patent Summary · Reference: M. Nawaz & A.J. Finn, “Flowsheet Synthesis and Design of...

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