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EnFlex focuses on delivering advanced and proven cryogenic technology solutions that help to drive productivity, improve efficiency, and maximize profitability. Our extensive technology portfolio is built to help our customers achieve competitive advantage.

Gas Liquefaction


EnFlex offers a wide range of proprietary liquefied natural gas (LNG) processes suitable for both onshore and FLNG applications. We have successfully delivered many LNG plants with scope of work that includes process licensing, engineering, major equipment and turnkey plant to meet our customer’s requirements.
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Cryogenic Gas Separation

Hydrogen & Olefins Separation

The PSHS-ProTM (patent pending) is our proprietary cryogenic separation technology specifically designed for Honeywell UOP’s Oleflex™ Process. The PSHS-ProTM is a process that separates hydrogen from a hydrogen-olefin effluent gas stream, or called reactor effluent from the dehydrogenation unit, by cooling the effluent gas stream to appropriate cryogenic temperatures.
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Hydrogen Carbon Monoxide (HyCO) Separation

Syngas is commonly produced in the chemical processing industry and often contains the desired hydrogen and carbon monoxide products. EnFlex offers proprietary cryogenic separation processes – partial condensation and methane wash to separate syngas into rich H2 and CO products.
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LNG is produced by taking natural gas from upstream production field, removing impurities, and chilling the gas (mainly methane) to -260°F (-161°C) so that it becomes a liquid. Once the natural gas becomes LNG, it only occupies about 1/600 the space of natural gas in its gaseous form, making it easy and safe for non-pressurized storage and transport. The principal use of LNG is for transportation natural gas to domestic and global markets, where it is regasified and distributed as pipeline natural gas or as fuel for natural gas vehicles.

sMR-ProTM is a single cycle mixed refrigerant process that includes a main HTX integrated in a coldbox, a heavy hydrocarbon removal column and a mixed refrigerant compressor. The composition of the mixed refrigerant cocktail is optimized to improve and maximize the efficiency and heat exchange in the liquefaction system. This process features higher refrigeration efficiency and simpler process setup to improve plant availability and efficiency.


pcsMR-ProTM is a mixed refrigerant process combined with a single refrigerant pre-cooling system. This process features high refrigeration efficiency, stable operation, and simple plant set-up. The pre-cooling system includes a refrigerant compressor and a core-in-kettle or coils-in-kettle type cooler. Compared to the sMR-ProTM, this process is less sensitive to fluctuations in the ambient air temperature or cooling medium temperature.

nEXP Options
nEXP-ProTM Dual EXP & Compander Options

nEXP-ProTM is a nitrogen expansion process using nitrogen as refrigerant.  This process includes a main HTX integrated in a cold-box, a heavy hydrocarbon removal column, a nitrogen recycle compressor, and dual turbo-expanders/compressors. Using nitrogen is one of the attractive features of this process because it is a relatively inert and safe refrigerant compared to the mixed refrigerant components. This process features fast start-up time, high operability, and cost competitiveness.

As an alternative configuration, a bull-gear compander can be used to replace the nitrogen recycle compressor and the dual turbo-expanders.


mEXP-ProTM is a methane expansion process using self-generated boiling-off gas (BOG) from the LNG tank as refrigerant.  The process includes a main HTX integrated in a coldbox, a heavy hydrocarbon removal column, a gas-recycle compressor and a turbo-expander/compressor. This process allows fast start-up, simple and easy operation because self-generated refrigerant supply doesn’t require additional refrigerant make-up and storage.

Cryogenic Gas Separation

On-Purpose Propylene Production

As one of the largest petrochemical commodities in the world, propylene is traditionally produced as a byproduct of petroleum refineries and olefin plant steam crackers. However, traditional sources of propylene can no longer yield the supply required by the market due to a shift of feedstocks from naphtha to ethane. On-purpose propylene production technologies such as Honeywell UOP’s Oleflex™ and CB&I’s CATOFIN® catalytic dehydrogenation technology have been developed to meet the propylene market’s supply and demand imbalance. The on-purpose propylene production is also largely planned to meet China’s dependence on imports of propylene derivatives and crude oil.

Hydrogen/Olefin Gas Separation

Olefex and PSHS-ProTM

The PSHS-ProTM is specially designed for Honeywell UOP’s Oleflex™ process to separate hydrogen from a hydrogen-olefin effluent gas stream, or called reactor effluent from the dehydrogenation unit, by cooling the effluent gas stream to appropriate cryogenic temperatures. The cryogenic temperatures are achieved by expanding the high-pressure effluent gas stream through two-stage expanders and by vaporizing the fresh feed hydrocarbons. The two-stage expanders are configured either as expander & compressor (PSHS Pro-I and Pro-II) or as expander & electric generator (PSHS Pro-III).

The effluent gas stream from the reactors of a dehydrogenation unit typically contains a mixture of hydrogen, methane and ethane light components, as well as olefin and other heavy hydrocarbons. The PSHS-ProTM separation system is designed to separate the light components – mainly hydrogen, from the mixture to produce olefin richened Liquid Product.  The residual hydrogen-rich vapor stream should be free of olefins and other heavy hydrocarbon components to minimize the loss of olefin components.

The PSHS-ProTM also features an highly reliable and robust main HTX that contains one or more custom-designed brazed aluminum heat exchangers. Each heat exchanger utilizes our staged liquid/vapor mixing methods and proprietary liquid/vapor bar designs to ensure even distribution and mixing of the liquid and vapor streams, achieving the most optimal thermal performance.

Hydrogen & Carbon Monoxide (HyCO) Separation

Syngas, or synthesis gas, is a gas mixture consisting primarily of hydrogen (H2), carbon monoxide (CO), and very often some carbon dioxide (CO2), methane (CH4) and nitrogen (N2). The name comes from its use as intermediates in creating synthetic natural gas (SNG) and for producing ammonia or methanol. Syngas is usually a product of gasification. Syngas can be produced from many sources, including natural gas, coal, biomass, or virtually any hydrocarbon feedstock, by reaction with steam (steam reforming), carbon dioxide (dry reforming) or oxygen (partial oxidation). Syngas is a crucial intermediate resource for production of hydrogen, ammonia, methanol, and synthetic hydrocarbon fuels.

The typical hydrogen and carbon monoxide (HyCO) separation includes two major processes: condensation and methane/nitrogen wash. For each process, the feed gas is first treated to remove any impurities that would freeze at cryogenic temperature. EnFlex has developed four proprietary cryogenic separation processes and systems configurations depending on the type and quality of feedstock and the required CO product specifications.

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