Ashland™ scale inhibitors
Ashland scale inhibitors comprise a family of proprietary, liquid products that effectively control the formation of inorganic hard scales, or beer stone, such as calcium carbonate, calcium oxalate, calcium sulfate and barium sulfate. When used within a fuel ethanol plant, the scale inhibitors significantly reduce the potential for scale formation within evaporators, heat exchangers and associated piping, pumps and tanks. The continuous use of these products reduces the rate of scale formation and modifies the structure of the scale so that it is more easily removed, resulting in less frequent and shorter downtime for system cleaning and maintenance (up to 50 percent less time). The use of the products leads to increased production of ethanol and decreased steam usage, typically, within a few days.
Ashland scale inhibitors utilize multiple mechanisms to control scale, including dispersion, sequestration, threshold inhibition and crystal modification. To prevent initial scale formation, the scale inhibitors nucleate small, scale-forming crystals in the bulk solution so that the crystals do not attach to and form scale on equipment surfaces (dispersion and sequestration). To slow and minimize scale formation, the scale inhibitors modify the surfaces of existing crystals so that new layers of scale do not form (threshold inhibition). For any scale that does form, the scale inhibitors disrupt the structure of the scale (crystal modification), making it softer and easier to remove.
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Product Availability
- North America
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Ashland scale inhibitors significantly reduce the potential for scale formation within fuel ethanol plant evaporators, heat exchangers and associated piping, pumps and tanks. Commercial applications confirm this and typically result in a number of value-added benefits.
● Reduced fouling and deposition
● Reduced process variability
● Increased ethanol production
● Increased thin stillage and syrup
● processing rates
● Reduced energy costs
● Reduced downtime
● Shorter maintenance outages
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Application Technology
For optimum results, Ashland scale inhibitors should be applied as received and fed at a point in the process stream where thorough mixing will occur. For most applications it is recommended that the scale inhibitor be fed at the inlet of the thin stillage pump, the syrup transfer pump that feeds the evaporator where fouling is occurring, or both. For heat exchangers and process piping, the scale inhibitor should be fed prior to the point of scale formation.