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BCMT™-500 and BCMT-500-LRT

Too often profitability is lost because refiners lack adequate accessibility and bottoms cracking power in their catalyst. Albemarle has developed BCMT-500 additive, which features high accessibility and provides powerful functional bottoms conversion sites. BCMT‑500 delivers many pre-cracking sites and high metals tolerance while making up only a small fraction of the circulating catalyst inventory.

BCMT-500-LRT provides refiners with the same accessibility, metals tolerance functionality and bottoms cracking power as BCMT-500, but has been formulated with lower rare earth content.

Contaminant metals such as nickel, sodium, vanadium and calcium destroy the acidic cracking sites of the catalyst inventory and catalyze dehydrogenation reactions. Modest amounts of calcium and inorganic iron form layers around the catalyst particle that act as barriers between the feed and the active sites. As a result, the accessibility, as measured by the Albemarle Accessibility Index (AAI), drops. Consequently, the larger feed molecules are no longer adequately converted once the AAI drops below its critical value. Left untreated, severe cases of iron and/or calcium poisoning result in conversion losses as high as 10 vol% (see Figure 1).

How does BCMT-500 work?
BCMT-500 provides an immediate remedy for boosting bottoms cracking power by counteracting the effects of increased metal contamination or the equilibrated accessibility index of the base catalyst being too low. Instead of waiting weeks or months for the contaminant metals to be flushed from the unit, the FCC unit conversion can be quickly restored to profitable levels by using BCMT-500.

BCMT-500 enhances the AAI by delivering the proper balance of superior pre-cracking matrix, selective zeolite sites and excellent inherent metals tolerance. The matrix technology used in BCMT-500 selectively cracks the bottoms and works to protect the host catalyst from the deleterious effects of contaminant metals, thus helping to restore the catalytic performance of the entire inventory. BCMT-500 provides these benefits without adversely affecting the delta coke make on the FCC unit.

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