Measurement and Testing 47 pH Measurement and Control of Ethylene Quench Waters
Ethylene is produced at high temperatures (750-1000°C) in a steam cracker. Olefins, Naphtha or LNG feedstock is steam cracked in a cracking furnace. The ethylene is produced when the high temperature process is stopped by water quenching. Accurate pH measurement and control, by the addition of caustic, to remove acid gases such as hydrogen sulphide and carbon dioxide of these quench waters is necessary to prevent unwanted emulsions forming.
Porous reference electrodes fail due to serious fouling and hydrogen sulphide poisoning present in the quench waters.
Accurate, Low-Maintenance, Long Life pH measurement and control is assured when the quench water process is controlled using the unique and patented Refex pH/mV electrodes. The Refex patented reference electrode uses a Non-Porous, ionically conducing, hard polymeric material replacing the need for porous liquid- junctions (Diaphragma). The Refex polymeric material doubles as an immobilised non-porous electrolyte and also as a protective interface/barrier that separates the quench waters from the reference Ag/AgCl half-cell and KCl electrolyte. As a result there is no liquid exchange or contact.
The Refex electrodes cannot be poisoned or fouled and continue to perform accurately even when completely coated with crude oil for examples. The coatings must remain wet and conductive.
The Refex electrodes are compatible with most pH transmitters. The electrodes shown in the image are compatible with Yokogawa pH transmitters (retrofit directly to the Yokogawa flow cell) and connect directly with the Yokogawa connecting cables.
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5-10 times longer life - Maintenance free (every 90 days) THE FIRST
REFEX Mobile Shift Operations Management System
Mobile eSOMS is being used at the Independent Belgian Refinery (IBR) in Antwerp to deliver improvements to process data collection procedures. Four teams of 18 operators now use this highly effective system to digitally record and automatically transfer data from around the site, making it available to necessary systems and personnel to ensure processes are optimised and the plant is running at best efficiency.
Mobile eSOMS can be used on the latest mobile devices. It replaces a previous paper- based system at IBR, increasing operational efficiency and enabling the collection of more data to bring further process and maintenance improvements at the refinery. This includes regular collection of temperature and vibration data on compressors, providing information to enable predictive maintenance to keep the plant running smoothly.
The eSOMS solution was initially trialed on a small desulphurisation unit and is now utilised on all equipment across the IBR site. The efficiency of data collection, data transfer and integration into other systems provides process engineers with a clear view of processes across the refinery, giving them the information they need to analyse and initiate any improvements required for best operation.
eSOMS provides a flexible solution for IBR with freedom to program for their specific requirements. Marc Van den Bossche, Assistant Asset Team Leader at IBR commented, “eSOMS has helped us to better integrate site operations and reduce the risk of human error. The increased efficiency with which we can carry out routine duties means we are able to collect additional data which will help to optimise processes and maintenance across the refinery.”
Ventyx, an ABB Company (USA), has designed eSOMS based on detailed understanding of the challenges in achieving the best efficiency, safety and reliability for the operation and maintenance of facility assets. It is a modular solution with a wide array of features available to meet varying site requirements, including RFID tags to ensure correct locations for readings, a Notice of Change system incorporating an audit trail which meets regulatory requirements, task tracking for easy compliance reporting, management of equipment identification and configuration control. It ensures efficient, error-free data sharing between systems by reducing manual data entry requirements. The system is ideal for recording and confirming the status of safety equipment and provides quick access to equipment data of critical importance to plant safety.
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121ad@reply-direct.com AUGUST / SEPTEMBER 2013 •
WWW.PETRO-ONLINE.COM TO LAST Refex pH/mV Sensors
• Best for all Water and Wastewater Applications • Solid-State Non-Porous Polymeric Reference • Accurate • Zero mV Drifting • Up to 10 Times Longer Electrode Life • Zero Maintenance (Resistant to Fouling and Poisoning) • Compatible with Good Quality pH Transmitters • Patented • Chemically Resistant Polymer • Resistant to High and Varying Temperatures (0-130C)
• Resistant to High and Varying Pressure ( Full vacuum to > 30 BAR pressure)
• Significant Savings all Round
FREE TRIAL OFFER - 90 Days Try It / Like it / Buy it offer (no obligations)
FREE CONSULTANCY Contact
timhrussell@live.com
EUROPE: Refex Sensors Ltd – Westport – Mayo – Ireland
refex07@eircom.net
USA: South Fork Instruments - San Francisco - CA
jmdaly@southforkinst.com
ASIA: Accurate Sensors SDN BHD – Malaysia
timhrussell@live.com
OEM and Dealer enquiries welcomed pH Problems?? Contact
timhrussell@live.com 'Refex Sensors, Experts in pH Control' email:
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