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Ethanol Production using the JetCooker

Up to 39% dry milled corn starch 

Flow Rate:
Varies; 100-1600 GPM [.4-6 m³/hr] 

Inlet Temperature:
Varies; 80-180˚F [27-82˚C] 

Discharge Temperature:
Varies; 200-300˚F [93-149˚C] 

Temperature Rise per Pass:
Varies; 30-300°F  

Steam Supply Pressure:
Varies; 15-70 PSIG [1-4.8 barg] 


Ethanol Production using the Jetcooker™

A major engineering firm that designs ethanol plants was looking to replace an alternative method of heating that was inconsistently cooking the starch in the liquefaction state (primary starch conversion process). This alternative method increased enzyme usage, longer cook times, lower ethanol yield per bushel, and poor energy efficiencies.


A K500 Hydroheater®, also known as the Jetcooker™, was installed to optimize starch conversion by controlling both temperature and mechanical shear precisely in a continuous process with variable flow rates. The device allows the user to adjust the liquid pressure drop across the Hydroheater. This allows the operator to maintain a consistent mechanical shear for optimum starch/steam interface even at flow rate changes as extreme as a 2:1 turndown ratio while holding the temperature set-point to within ±1°F.

Having standardized on the K500 Series, the company has produced hundreds of millions gallons of ethanol in the U.S. alone, with a Hydroheater at the heart of each production plant.


• Consistent starch cooking
• Reduce enzyme usage
• Decrease cook times
• Higher ethanol yield per bushel


• Installed K500 Hydroheater (Jetcooker)
• Accurate temperature control
• Reduced enzyme usage
• Decreased cook times
• Increased ethanol yield


 Are you curious about our patented direct steam injection technology? Click here to learn more.

Are you wondering what applications are ideal for direct steam injection? See the Where It Works section for the a list of industries.

Do you want to learn more about our products? Click here for more information.

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Hydro-Thermal is the global leader in the development and manufacturing of Hydroheaters. Through our vast global channel partners, we support hydro heating in six continents and all industrialized areas. We create heating systems for a variety of industries including: pulp, paper, chemical, ethanol, food & beverage, metal, & more!

Hydro-Thermal Corporation 

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