LensElastomers
Single Shaft Kneader Reactor
LIST kneader reactor offers key advantages including process simplification and energy savings.
LensDirect Devolatilization Diagram
Devolatilization KneaderReactor
LIST’s devolatilization technology provides excellent solvent removal without damaging temperature-sensitive polymers.
LensKneader Reactor Comparison Table

The removal of solvents from a polymerized mass is a two-step process. The first step removes most of the solvent through main evaporation or bulk devolatilization. The second step eliminates trace amounts, reducing solvent content to acceptable levels. Conventional devolatilization involved extrusion, which typically meant short residence times and high shear. This not only increased production time and cost but decreased overall yield. 

So at LIST we’ve dedicated ourselves to finding a better solution.

LIST Devolatilizers

By successfully incorporating devolatilization into our kneader reactors, LIST enables processors to increase residence times and significantly reduce shear. As a result, LIST customers maximize polymer quality and yield while minimizing residual volatiles and operating costs.

Key Benefits

  • Creates low, uniform shear, even with large-volume, high viscosity masses
  • Provides excellent surface renewal and heat transfer
  • Enables high turndown ratio and longer residence times 
  • Large vent area eliminates entrainment and plugging
  • Handles different polymer grades, solvents, and melt viscosities without retooling
  • Self-cleaning design prevents local overheating and product damage
  • Plug flow, narrow residence time distribution
  • Operates under vacuum or pressure

Today, the LIST kneader reactor is the preferred method for the devolatilization of a wide variety of polymers and elastomers. Applications include: BR, SBR, SBS, SIS, SEBS, bi- and tri-block polymers, EPDM, EPM, EOM, cross-linkable (co-)polymers, elastomer solutions, polymer solutions and other comparable products.

To see how devolatilization with LIST kneader reactors compares to conventional extrusion, thin film processing, and steam stripping, see comparison chart to the right. 

LIST’s direct devolatilization process for temperature sensitive materials can eliminate multiple steps required in conventional processes, including additional steps for solvent recovery and purification.