GTC Technology Licensing Partnerships at WorkReducing the Cost of H2S Removal and Sulfur Recovery

GT-DOSTM

Engineered to Innovate®

GT-DOSTM

GTC Technology Licensing Partnerships

Engineered to Innovate

GT-DOS: Reducing the cost of H2S Removal and Sulfur Recovery by Direct Oxidation to SulfurH2S removal and sulfur recovery from streams with “medium” amounts of sulfur have historically been challenges for the industry. At sulfur recovery rates of less than 0.1 ton/day, solid and liquid scavengers and sorbents are cost-e� ective and preferred by the industry. At sulfur recovery rates of over 100 ton/day, “modi� ed Claus” processes are generally favored. In the intermediate range, direct treatment with aqueous iron liquid redox or bacteria based “bio-desulfurization” processes may be used. However, these processes have challenges at higher operating pressures and in the presence of heavy hydrocarbons, in addition to operations and maintenance issues relating to solid precipitation. � ese processes also have high operating cost and the sulfur that is produced generally has no value and incurs the cost of disposal.

GT-DOS is a patented technology developed by TDA Research and licensed worldwide by GTC Technology. GT-DOS o� ers simplicity of operation, and is speci� cally applicable to lean acid gas streams, cost e� ectively recovering sulfur in the 0.1 to 200 ton/day range.

Process Overview� e GT-DOS technology converts H2S catalytically directly into sulfur, from lean (low concentration) H2S streams. � e sulfur conversion e� ciency is around 90% in a single pass, and is based on the reaction listed below:

H2S + ½ O2 → S + H2O

An advanced metal oxide catalyst enables sulfur conversion at low or high pressures, and has been demonstrated to be robust in the presence of heavy hydrocarbons. � e catalyst has been proven to be resistant to high concentrations of hydrocarbons, including aromatics and ole� ns.

� e H2S containing feed stream is mixed with air, heated to the reaction temperature of around 400°F (200°C) and fed to the GT-DOS reactor. � e reacted stream containing sulfur vapor is then condensed to recover the sulfur. � e gas stream can be further desulfurized with sorbents or tail gas treatment. � e sulfur is recovered as molten sulfur with properties similar to traditional Claus sulfur. It can be converted to solid sulfur for ease of handling.

Heat integration between the feed and e� uent reduces overall utility consumption. Recycle designs increase overall conversion and enable the treatment of higher concentration acid gas streams.

� e GT-DOS process o� ers the inherent bene� ts of a single step process for H2S removal and sulfur recovery, while avoiding the operating problems of aqueous redox or biological processes. � e limited amount of equipment greatly reduces equipment cost, and reliability and maintenance issues.

ApplicationsGT-DOS is applicable to lean H2S streams (< 10%) across a range of pressures (<1000 psi or 60 bar).

GT-DOS is bene� cial for operators who:

• Have stranded sour natural gas

• Need low capital cost bulk sulfur removal prior to a high e� ciency tail gas clean-up operation or to enable a stream to be vented

• Operate a conventional “modi� ed Claus” plant� e technology is particularly applicable for those that need sulfur removal for fuel gas applications, incinerators, or amine o� -gas streams that need to be vented.

Process Advantages• Does not require acid gas enrichment, can directly

convert streams with low H2S content

• High pressure operation

• Lower capital cost compared to “modi� ed Claus”, liquid iron-redox, bio-sulfurization or non-aqueous liquid phase sulfur recovery processes

• Operating costs comparable with conventional “modi� ed Claus”, and signi� cantly lower than liquid iron-redox or other non-aqueous sulfur recovery processes

• High purity, saleable sulfur

• Proven capability to handle higher hydrocarbon content compared to traditional direct oxidation, or liquid iron-redox approaches

GTC Technology 900 Threadneedle St., Suite 800 Houston, Texas 77079 Main +1-281-597-4800 Toll Free +1-877-693-4222inquiry@gtctech.com | www.gtctech.com

GTC Technology Engineered to Innovate

Sour Gas

Air

BFW

Steam

Treated Gas

Sulfur

Condenser

Reactor

Figure 1 – Schematic of GT-DOS process, illustrating its simplicity. Depending on the level of sulfur recovery or H2S level in the Treated Gas, the process may be run in recycle or multi-stage mode.

Figure 2 – Operating Envelope for the GT-DOS Process

Sulfur Plant Capacity (Ton/Day)

H2S

in G

as

100%

10%

1%

0.1%

0.01%

Scav

enge

rs

Liquid Redox

Claus with AcidGas Enrichment

Claus

GT-DOSDirect Oxidation

0.1 1.0 10.0 100 1,000

TM

Engineered to InnovateTo learn more about GTC Technology’s leading-edge technology solutions and the many ways we can help improve your operations and pro� tability, call us today at +1-281-597-4800, e-mail us at inquiry@gtctech.com or visit our Website at http://www.gtctech.com.

GT-DOS™ is a trademark of GTC Technology US, LLC.

GTC Technology 900 Threadneedle St., Suite 800 Houston, Texas 77079 Main +1-281-597-4800 Toll Free +1-877-693-4222inquiry@gtctech.com | www.gtctech.com

+1-281-597-4800 inquiry@gtctech.comwww.gtctech.com

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GTC Technology is a global licensor of process technologies and mass transfer solutions with the mission of creating value for our clients. Re� ning, petrochemical and chemical companies around the world rely on GTC’s advanced processes to optimize production capacity and e� ciency. With insightful industry expertise, research capabilities and innovative thinking, GTC solves complex processing problems and has earned a reputation of excellence in designing and delivering high-quality, strategic solutions for clients worldwide. We’re engineered to innovate.

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