Quiz

1/6

What resid-upgrading process produces minimal high-sulfur coke?

  • Fluid 
    coking

    Incorrect

  • FLEXICOKING

    Correct

  • Delayed 
    coking

    Incorrect

  • Hydrogenation

    Incorrect

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Flexicoking

FLEXICOKING™ technology is a commercially proven fluid-bed process, designed for thermal coking all types of residue feeds with minimal coke production – as low as 1 percent of feed is converted to coke product. Also, there is no high sulfur petcoke production to market and no coke drum deheadings associated with delayed coking. FLEXICOKING technology gasifies the majority of the produced coke.

2/6

Refiners use flexigas produced by the FLEXICOKING™ process to:

  • Reduce costs

    Incorrect

  • Fire heaters
    and/or boilers

    Incorrect

  • Generate 
    power

    Incorrect

  • All three

    Correct

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All three

In the FLEXICOKING™ process, excess coke in the heater is transferred to the gasifier, where it reacts with air and steam to produce flexigas (CO2/H2 rich syngas). Flexigas provides energy for use in the refinery and/or to integrate with neighboring facilities for energy production/gas sales. Depending on local market conditions, flexigas can substantially reduce refinery energy cost versus fuel oil, natural gas or purchased power. Flexigas is used in boilers and most types of fired heaters. The capability of existing equipment to fire flexigas has been proven for over 40 years.

3/6

What type of catalyst is used in FLEXICOKING™?

  • Dewaxing 
    catalyst

    Incorrect

  • Sulfur removal 
    catalyst

    Incorrect

  • Hydrotreating 
    catalyst

    Incorrect

  • It doesn’t use 
    a catalyst

    Correct

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It doesn’t use a catalyst

FLEXICOKING™ technology is a commercially proven fluid-bed carbon rejection process, designed for thermal coking all types of residue feeds with minimal coke production. Carbon rejection processes generally refer to thermal coking processes that operate at low pressure (less than 0.4 MPa-g/60psig) and use thermal cracking reactions to achieve the desired conversion of the high boiling molecules. There is no need for catalysts in these processes.

4/6

What types of emissions can use of flexigas reduce?

  • SOx

    Incorrect

  • NOx

    Incorrect

  • Particulate

    Incorrect

  • All three

    Correct

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All three

The flexigas produced in the gasifier during the FLEXICOKING™ process burns very clean with ultra-low production of sulfur oxides (SOx) or nitrogen oxides (NOx) when consumed in fired heaters or boilers – significantly lower NOx production than natural gas or conventional refinery fuel gas. Processing and handling the coke in a continuous closed system minimizes particulate emissions compared to typical coking operations.

5/6

What is the role of FLEXSORB™ in the FLEXICOKING™ process?

  • Steam 
    generation

    Incorrect

  • H2S removal

    Correct

  • Temperature 
    reduction

    Incorrect

  • Feed flexibility

    Incorrect

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H2S removal

In the FLEXICOKING™ process, most of the coke is gasified and the resulting gas is desulfurized using ExxonMobil’s proprietary FLEXSORB™ technology. The technology is designed for selective removal of H2S in the presence of CO and CO2 and utilizes a proprietary severely sterically hindered amine. This allows the FLEXSORB technology solvent to achieve high H2S cleanup selectively at low solvent circulation rates. After the FLEXSORB stage, the flexigas contains less than 10 vppm H2S and is ready for use as fuel in fired process heaters and/or boilers for steam and power generation.

6/6

Why does FLEXICOKING™ typically require 20% less space within a refinery than delayed coking?

  • Lower operating 
    temperatures

    Incorrect

  • No need for 
    coke storage

    Correct

  • Compact 
    desulfurization

    Incorrect

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No need for coke storage

In the FLEXICOKING™ technology process, most of the coke is gasified, eliminating the need for open coke pits and associated particulate emissions with enclosed coke transfers. Reduced coke reduces the need for storage space. The large quantities of high sulfur coke produced in traditional delayed coking processes or residual bottoms streams produced in hydrogenation processes require much more space within a refinery.

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