Gas & LPG Treating

Reliably meet your product treating requirements

The Merox™ Process, commercialized over 50 years ago by UOP, can eliminate the need to purchase expensive proprietary equipment, is not susceptible to fouling and does not require feed or caustic filters and offers greater than 99.5% on-stream availability.

Cost effectively treat refinery gas streams

View Larger ImageMerox Gas Treating

UOP’s gas treating, extraction Merox™ process utilizes a high efficiency gas-liquid contacting design to extract low molecular weight mercaptans from a refinery gas stream using a strong aqueous caustic solution.

The mercaptide-rich solvent, which contains the Merox catalyst, is sent to the regeneration section where air is injected and the mercaptides present are oxidized to disulfides.

The disulfides are subsequently separated from the solvent and; the regenerated lean caustic solvent is recycled back to the Merox Extractor. Typical product mercaptan levels can be controlled to less than 10 wppm.

UOP has licensed more than 1,700 Merox units worldwide.

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Meet downstream unit feedstock requirements

View Larger ImageSpent Caustic - tab 2

An LPG Extraction Merox Unit is designed to remove H2S, COS and Mercaptans from the LPG required when further processing of C3 and C4 olefins in alkylation, polymerization or petrochemical synthesis is required. The capital-efficient Extractor Plus design is typically used in this service.

The Extractor Plus design incorporates caustic pre-treatment, mercaptan extraction and post-treatment into a single vessel, thereby offering a low capital cost alternative to other extraction processes. Typical product mercaptan levels can be controlled to less than 5 wppm.

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Partial oxidation solution for sulfidic caustic

View Larger ImageSpent Caustic Handling Process

Hydrocarbon processing facilities that utilize caustic must contend with the caustic effluents that are generated by these processes.

Caustic management as well as effluent treating and disposal are areas of growing interest and concern. Spent caustic disposal costs, especially those incurred by waste hauling, are expected to continue to increase. Unfortunately, the excessive pH, biological oxygen demand (BOD) and chemical oxygen demand (COD) of sulfidic caustic can often prohibit direct re-use in process and easy disposal.

However, the UOP Sulfide Oxidation Process provides a viable solution for refiners to manage this caustic stream that enables disposal of this stream within the refinery battery limits.

UOP’s Sulfide Oxidation Process can be used to convert the waste sulfidic caustic stream to a low pH effluent with reduced BOD/COD characteristics that can allow it to be handled within the refinery water treatment facility.

The process offers several benefits:

  • Low operating and investment costs: The mild operating conditions employed by this process minimize utility requirements and ensure that costly exotic metallurgies are not required.
  • Minimal additional treating and disposal requirements. The final product has a near neutral pH and it COD is reduced by 50%, as compared to the feed, prior to dilution, thus making it much easier to handle in downstream treatment facilities.
  • No H2S liberation. Once the conversion is complete, H2S cannot be released under any conditions used in this process.

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