ScaleTrol G Evaporator & Syrup Line Antifoulant Treatment
Leading Midwest Ethanol Producer | 60 MGY Dry Mill Facility | Program Initiated May 2025
Executive Summary
A leading Midwest ethanol producer operating a 60-million-gallon-per-year (MGY) dry mill facility deployed ScaleTrol G as a replacement for its previous antifoulant program beginning May 2025. Applied at two injection points — the front end of the evaporator train and the heavy phase syrup line — ScaleTrol G delivered transformational results within a single operating year.
The results speak for themselves: CIP frequency on the evaporator train was cut in half, system pressure profiles remained flat for the full year, and — most dramatically — the syrup line cleaning program that had consumed 240 labor hours at every shutdown since the plant began operations was eliminated entirely.
Metric | Before ScaleTrol G | After ScaleTrol G | Improvement | Evap CIP Frequency | Weekly (every evap) | Every 2 weeks | 50% reduction |
|---|---|---|---|
System Pressure Rise | Gradual rise all year | Flat — no increase | Eliminated |
Evaps Hydro Blasted at Shutdown | 6–7 of 8 units | 2 units (precautionary) | ~70% fewer units |
Syrup Line Labor at
Shutdown | 240 hours every year | 0 hours | 240 hrs saved |
Syrup Line Disassembly Required | Full teardown every year | None required | Eliminated entirely |
Syrup Line Scale Accumulation | Severe (pencil test fail) | Little to none observed | Near-zero fouling |
Background & Challenge
Ethanol dry mill operations are particularly susceptible to scaling and fouling in two critical areas: the multiple-effect evaporator train, where thin stillage is concentrated into syrup, and the syrup transfer lines and valves that move concentrated product to downstream processes. Left unaddressed, scale accumulation reduces heat transfer efficiency, drives up system pressures, shortens equipment run times, and ultimately demands costly cleaning interventions.
At this 60 MGY facility, fouling had been a persistent, costly operational challenge despite use of a competitive antifoulant product. Annual shutdowns required an intensive program of equipment disassembly, high-pressure hydro blasting, and reassembly that had been carried out at every shutdown since the plant’s commissioning.
Conditions Prior to ScaleTrol G
- Evaporators required a full CIP cycle on at least one unit every week throughout the operating year.
- 6 to 7 of the 8 evaporators required hydro blasting at every annual shutdown.
- System pressures rose steadily through the year, signaling progressive fouling and loss of heat transfer efficiency.
- All piping, valves, and fittings between the evaporators and heavy phase (HP) syrup lines required complete disassembly and hydro blasting at every shutdown.
- Scale accumulation in syrup lines was so severe that in some sections it was not possible to pass a pencil through the line bore.
- Syrup line teardown and cleaning consumed approximately 240 labor hours per shutdown — work that plant operators described as one of the most demanding and undesirable tasks on site.
Fouling Conditions Prior to Treatment — Photographic Evidence
Figure 1: Flange face with severe scale buildup, 2025.Bore restriction so severe lines could not be cleared without hydro blasting.
Figure 2: Looking into syrup line bore, 2026
ScaleTrol G Treatment Program
ScaleTrol G was introduced at two strategic injection points, targeting the primary fouling locations identified through the plant’s operating history:
Improvement | Dose Rate | Target Area | Front end of Evaporator Train | 100 ppm | Multiple-effect evaporators — heat transfer surfaces and condensate systems |
|---|---|---|
Heavy Phase Syrup Line | 50 ppm | Syrup transfer piping, valves, and fittings between evaporators and HP lines |
Results After 12 Months of Treatment
Evaporator Train Performance
- CIP frequency reduced by 50% across the entire 8-unit evaporator train for the full operating year.
- System pressures remained flat throughout the year with no measurable increase — a stark contrast to the steady pressure rise observed in prior years, which signaled progressive fouling.
- At annual shutdown, only 2 of 8 evaporators were hydro blasted, and plant personnel noted this was largely performed because the maintenance crew was on-site and available — not because cleaning was operationally required. The remaining 6 units required no hydro blasting.
Syrup Line Performance
- No pressure increases were observed in the syrup transfer system throughout the entire 12- month operating period.
- At shutdown, 2 sections of pipe were opened for inspection. Little to no scale was observed — a result that plant operators described as unprecedented in the facility’s history.
- No cleaning or hydro blasting of the syrup system was required at shutdown.
- The 240-labor-hour syrup line teardown and cleaning program — which had been performed at every single shutdown since plant startup — was completely eliminated.
Labor Savings
The elimination of syrup line cleaning at shutdown represents a significant and immediate labor cost reduction. The 240 hours previously devoted to this work — physically demanding, high-pressure hydro blasting in confined spaces — can now be reallocated to value-added maintenance activities or used to shorten overall shutdown duration.
“This has been done at EVERY shutdown since the plant has been running — until now.”
Plant operations personnel, reflecting on the elimination of the syrup line cleaning program.
Competitive Context
Prior to ScaleTrol G, this facility operated with a commercially available competitive antifoulant program. Despite that treatment, the plant continued to experience the fouling challenges described above — including annual syrup line cleaning, frequent evaporator CIPs, and progressive pressure increases — on an unbroken cycle since startup.
The transition to ScaleTrol G produced improvements in every measured performance category within the first operating year. The results establish a clear, quantifiable performance advantage for ScaleTrol G in this application.
Conclusion
ScaleTrol G delivered measurable, plant-confirmed performance improvements across both target applications at this 60 MGY facility. The program reduced evaporator CIP frequency by 50%, maintained flat system pressure profiles year-round, reduced the number of evaporators requiring hydro blasting from 6–7 to effectively zero, and eliminated a 240-labor-hour shutdown task that had been a recurring operational burden since the plant’s startup.
These results demonstrate the ability of ScaleTrol G to not only control ongoing fouling, but to fundamentally change the maintenance profile of ethanol evaporation and syrup handling systems — reducing cost, improving equipment availability, and eliminating some of the most demanding work in the plant.
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