Refiners today are finding that the increased demand for high-quality transportation fuels is forcing them to convert a higher percentage of crude oil to lighter products. For many, that means expanding the refinery's hydrocracking capacity to meet more stringent product specifications. To maintain profitability, it is essential that these quality improvements be made without sacrificing product yield.

And that's why CLG has continued to improve its ISOCRACKlNG technology.

ISOCRACKING technology can improve the economics of almost any refinery scheme.

CLG's ISOCRACKING technology is the most flexible upgrade path to lighter products - a path that can help you reach a balance between stringent product specifications, product yield, cycle run length, capital investment and operating costs. That's because CLG ISOCRACKlNG technology offers you flexibility in the choices of crude oil to buy, the products you can produce, the operating efficiency you can achieve, and ultimately, the profitability you can realize.

Around the world, a 50 ppm specification for sulfur in gasoline and diesel will likely move to even lower levels in the future. CLG's experience with ISOCRACKING in the highly regulated California fuels market makes it easy for refiners to produce clean fuels from different feeds.

ISOCRACKING technology can improve the economics of almost any refinery scheme. We offer designs for all types of configurations, including:

  • Single-Stage Once-Through (SSOT)
  • Single-Stage Recycle (SSREC)
  • Two-Stage Recycle (TSR)

CLG's ISOCRACKING SSOT configuration produces feedstocks with superior characteristics for FCC feeds, high VI lubes or ethylene plant feeds. Our latest development for SSOT employs a moderately high-pressure design in conjunction with a tailored catalyst system that provides unsurpassed hydrodenitrification and high hydrocracking activity.

This moderate pressure hydrocracking requires a lower initial investment while providing refiners with the opportunity to economically revamp the unit for higher conversion, higher throughput, more difficult feeds and/or more stringent product quality specifications at a later date.

The SSREC configuration is used for very high conversion processing of light feeds and, for low capacity units, processing heavy feeds at low feed rates.

Conventional Two Stage Configuration

Increased yields and flexibility: The ISOCRACKING Two-Stage Recycle process is optimized for maximum yields of premium products with minimum hydrogen consumption. The first stage removes feed impurities and converts 20-50% of the feed. The second stage cracks the cleaned feed at lower temperatures.

CLG's TSR reactor configuration enables refiners to handle a wider range of feeds and feed rates. The benefits of the TSR are:

  • it separates catalyst functions for maximum effectiveness
  • it affords complete conversion of gas oil to products
  • it provides maximum recycle cut-point flexibility
  • it provides maximum yield of middle distillates
  • it produces high-quality kerosene and diesel fuels
  • it produces a heavy naphtha product that is excellent reformer feed
  • it is most effective for higher capacity plants

Reverse Stage ISOCRACKING was the next logical step in the continuing development of the Two-Stage Process. Reverse Stage ISOCRACKING uses the second stage effluent as the inlet gas for the first stage.

It results in:

  • lower capital investment
  • lower operating costs

Revamp for better products and better performance

The conventional approach to revamping an existing SSOT unit is to add additional reactor volume downstream or to add a "saturation reactor" to improve the quality of one or more products.

CLG's solution, Optimized Partial Conversion (OPC) ISOCRACKING, is less expensive and more flexible than the conventional methods. Using the Reverse Stage ISOCRACKING technology, the SSOT is converted to a partial or full recycle Two-Stage configuration by the addition of a small reactor upstream of the existing reactor.

The original single or "first stage" reactor effluent system removes organic nitrogen and other catalyst poisons, so that a portion of the fractionator bottoms can be recycled to the new "clean" second stage reactor. This produces high conversion to very high-quality products at less investment.

CLGs cost effective revamp solution achieves very hight-quality products by adding a small reactor upstream.

CLG's cost-effective revamp solution achieves very high-quality products by adding a small reactor upstream.




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