AVA GmbH u. Co. KG

Mixers, dryers, innovative solutions for starch industry - Manufacturing, Other

Chemically modified starches (from potatoes, corn, tapioca, wheat, peas, and others) are used in papermaking, among other applications, to improve paper strength. The wet process is used most frequently in this case. The starch is slurried in water, then the cationizing agent is added to cause it to react. The starch remains in a suspension throughout the entire process until drying. However the drying method is more economical. In this process, natural starch powder is intensively mixed with the cationizing agent. The etherification reaction then takes place in a reactor. The reactor is connected downstream to a second neutralizing mixer. The starch consistency remains powdery throughout the process.

Cationic Starch Production

The AVA HRM ring layer mixer and the continuous AVA HTK-T reactors are used in series production of cationized starches. In the first stage, the starch powder (native starch) is intensively and homogeneously mixed with the etherifying agent and sodium hydroxide (catalyst) in the ring layer mixer at circumferential agitator speeds of up to 40 m/s. Following this, etherification is carried out in an AVA HTK-T heated reactor. The reaction process is maintained continuously at processing times of between 2 h to 4 h. Finally, in a second AVA HRM ring layer mixer, the sodium hydroxide solution is neutralized by adding acid. This final process step requires highly uniform mixing of the components.

Further Starch Industry Applications

Deciding Facts – Starches

  • Reduced consumption of raw materials compared to the wet process
  • Wastewater-free process
  • Shorter processing times compared to the wet process
  • Very high solids content
  • Consistently reproducible product quality
  • Batch process or continuous process – AVA offers both options

AVA ring layer mixers in combination with AVA reactors are ideally suited to the challenging tasks of the starch industry due to their high mixing intensity (optimal etherification).