Q & A

Welcome to ePTQ's Q&A: the technology Q&A for the refining, gas, biofuels and petrochemical processing industries. You can browse existing questions and answers by topic or date or carry out a freetext search.

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We are excited to be Strategic Partner of the World Refining Association’s ERTC: Ask the Experts. From the organisers of ERTC, the biggest and most important event for the European downstream industry, this is the only event in Europe offering process and maintenance engineers a platform to ask their burning questions about the everyday challenges facing their plant and hear the practical solutions from industry experts.

This face to face interactive event features experts from leading European refineries and technology providers; engineers have the chance to hear unparalleled knowledge through interactive discussions such as fishbowl panels, Q&A Panels and Poster Sessions. Learn more at: asktheexperts.wraconferences.com  


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Date  Replies
29/01/2021 Q: This is about a LPG Merox unit in our refinery. Since the content of RSH(mercaptan) in the feedstock has more than doubled, this makes it difficult to regenerate the caustic. The content of mercaptide and disulphide in regenerated caustic has greatly increased. Frequent replacement of caustic and increased air flow and temperature in the oxidizer doesn't solve the problem. How can we solve the problem if we can not change the feedstock?
(4)
18/07/2009 Q: What is the basic difference between a thermal and pressure safety valve? (5)
09/09/2020 Q: During precommissioning of our DHDT unit we want to pressurise the system with nitrogen by makeup gas compressor up to 50kg/cm2g. Can we increase pressure without achieving the minimum pressurisation temperature?
(3)
21/01/2010 Q: In a sulfur recovery unit incinerator (where calus process in front end followed by CBA process), presently incinerator control temperature is 605 Deg C. Can I bring down to 550 DegC? What will be the consequences? What will be the ground level SO2 content? (2)
04/02/2021 Q: I work in a UOP licensed DHDS unit. It has one HP amine absorber to absorb H2S from recycle gas. At thr top of the column, a water wash facility with level tray is installed to wash lean amine from recycle gas. We are experiencing foaming. The water tray level quickly fills and goes to the next recycle gas knockout drum. Delta pressure of the column is also increasing and the level increases suddenly in the water tray even after isolating fresh water. The delta temperature between amine and process gas is 12oC. Drained liquid is milky in colour. Please suggest a remedy.

(3)
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