Founded in 1998 by John O’Connell, an authority in SRU environmental and engineering circles with a proven track record in Sulfur Recovery in Gas Plants and Refineries Worldwide, SRE has successfully completed hundreds of projects, and is an industry leader in the development and on-site use of state-of-the-art equipment’s and processes.
Sulfur Recovery Engineering (SRE) is an international engineering field testing and consulting company that helps clients to operate safely, cut costs, reduce emissions, and optimize performance of their Facilities.


Don’t let the name fool you – Sulfur Recovery Engineering specializes in the optimization of Sulfur Recovery Units (SRU’s), Amine Units and Dehydration Units. SRE is capable of taking samples from almost any process gas stream in any unit in gas plants or refineries, and perform an immediate onsite analysis. SRE has also performed onsite testing for fertilizer plants, CO2 plants, pulp mills, and has even performed building air quality assessments.

SRE’s services provide our customers with invaluable information regarding the materials and reactions taking place within their processes, and how this impacts equipment, operations, and their bottom line. SRE provides solutions to operating problems, and helps clients to optimize sulfur recovery, limit emissions, prevent unscheduled emergency plant shutdowns, and control costs.
Heavy Industrial Chemical Factory at night ABOUT US
Oil and gas refinery industrial plant
SRE is committed to Research and Development in Sulfur, Amine, Dehydration and related technologies, and is a member company in Alberta Sulphur Research Limited (ASRL). ASRL conducts research in the field of chemistry and it concerns the science and technology of sulfur and its compounds with particular emphasis on the production, processing and utilization of sour gas, sour crude oils, oil sands, and their related products. Much of the current focus is on energy efficiency, environmentally sound recovery processes, and the handling, storage and transportation of elemental sulphur.
Sulfur Recovery Engineering SRE
Don Green
Business Development
Don is an effective problem solver who helps SRE’s clients and prospective clients to identify and clarify problems and determine appropriate solutions offered by SRE and other working partners. By clearly identifying issues, Don helps to develop and implement applicable solutions in a cost effective and timely manner.
Sulfur Recovery Engineering SRE
Inshan Mohammed, P.Eng
Process Engineer

Inshan has several years of experience in the sulphur recovery industry leading SRE’s field teams of Engineers and further assisting clients with their sulphur recovery needs. His experience also includes front end design and detailed engineering. Mr. Mohammed’s spoken and written languages include English and French, and he is an instructor for SRE’s operator and engineer training seminars.

Sulfur Recovery Engineering SRE
Dharmesh Patel, P.Eng
Lead Process Engineer & Senior Simulation Specialist
Dharmesh has more than 10 years of process simulation and process engineering experience including commissioning, shutdowns, startups and operations support services. Dharmesh has completed many SRU Steady State and Dynamic simulation projects for SRE clients. He is also an instructor for SRE’s operator and engineer training seminars.
Sulfur Recovery Engineering SRE
Ahmad Nyeazi, E.I.T
Lead Process Engineer & Senior Simulation Specialist
Ahmad is a recent chemical engineering graduate and registered as E.I.T with APEGA. He joined SRE in September 2017 and has done internship in Project Services environment, where he got first hand experience in cost control and cost estimation portion of projects. In addition, during his second internship he obtained experience in drilling, completions and surveillance of wells (lateral wells).
Sulfur Recovery Engineering SRE
Caleb Kuhn, E.I.T

Process Engineer-in-Training (EIT)

Caleb graduated in 2018, with 2 years of chemical engineering experience. He joined SRE in July 2018, bringing his experience of process safety, production and field engineering. Having worked in process facilities in both the agriculture and oil and gas industries, he brings with him a broad view of chemical engineering applications.

Sulfur Recovery Engineering SRE
Egbert van Hoorn
Refining and Gas
Treating Consultant

Egbert has a reputation as a problem solver for amine plants and it is this skill that he applies in his position as senior consultant to SRE. Troubleshooting, testing and start-ups of hydrotreating, Merox, hydrocracking, sour water stripper and amine units are all strengths of his. Egbert is well known as a troubleshooter and a trainer and is fluent in English, Dutch, German and French.
Sulfur Recovery Engineering SRE
Robert (Bob) Veroba, P.Eng
Refining and Gas
Treating Consultant

Bob has 35 years experience in Refinery and Gas Plant amine unit Technical Support, Process Design, Operations, Plant Startups, Operator Training, Process Simulation and Process Licensing. This background will help SRE’s clients with effective solutions to their plant operating problems.
Sulfur Recovery Engineering SRE
Chuck Stephenson
US Regional Manager

Chuck Stephenson received a BS in Chem Edu., from Baylor University in 1984, he has been involved in the Sulfur industry for over 30 years, he has performed field tests and prepared detailed analytical reports to assist engineers in optimizing gas treating, sulfur recovery and tail gas treating units at refineries and gas processing facilities around the world.

Chuck has also been involved with Sales and Marketing throughout his career, he has attended the Laurence Reid Gas Conditioning Conference for the last 27 years and has been a member of the Gas Processors Association for over 20 years.

Sulfur Recovery Engineering SRE
Ron Armstrong, P.Eng.
Business Development – Emissions Reduction Technologies

Ron is a Chemical Engineer with over 35 years of experience in operations engineering, business development and account management. Ron has a proven track record of optimizing facilities. Ron focuses on assisting SRE customers with business execution, driving to bottom line goals and profitability through experience in assessing value, opportunities and risk in regulated and non-regulated business environments. 



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Quinn Kovach

Development Engineer

Quinn achieved her chemical engineering degree in 2021 and joined SRE’s team in February 2022. Throughout her education she focused on the study of air pollution mitigation and process optimization. She brings a high level of enthusiasm and attention to detail to each job.

Client Testimonials

canadian natural
exxon mobil
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husky energy
flint hills
thaioil group
bayern oil
conoco phillips
big west oil

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