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The Spectacle-Shaped Blade Ensures Excellent Agitation.
As the characteristics and diversity of polymers increase, processors of high-viscosity polymers must also be diversified and their performance enhanced. For the production of these polymers, a high-efficiency agitation blade is vital.
Hitachi began manufacturing horizontal biaxial processors for high-viscosity liquids in 1965. Since then, Hitachi has delivered 50 continuous polyester polymerization and other plants. Equipped with a spectacle-shaped agitation blade, these plants are highly regarded for their superior agitation efficiency and for the quality of the liquids processed. Hitachi spectacle-shaped blade polymerizers are used in a range of applications including polycondensation processing (for producing synthetic resins) and solvent degassing (for producing medicines), as well as in gas/liquid reactors. In all these fields, the result has been improved quality and productivity.
Hitachi offers more ; an integrated high-level support system. For example, in basic experiments conducted to study fundamental characteristics such as fluidity, a wide range of data has been collected using simulated liquids. Furthermore, Hitachi is actively suggesting new processes, based on data derived from agitation simulation and sample tests, as well as on knowledge accumulated by Hitachi as a user. Thus Hitachi maintains the comprehensive, high-quality resources that are essential to serving the diversifying and increasingly sophisticated needs of its customers.
Spectacle-shaped blade
Ideal piston-like flow with no reverse mixing
The number of effective complete mixing tanks per spectacle blade is 11/16 for a liquid viscosity of 400 Pa.s. This provides a piston-like flow, eliminating liquid residence - a feature that cannot be offered by a disc blade agitator that has only 9/16.
Tracer response diagram
Greater liquid surface area for faster evaporation speed
A greater liquid surface allows mutual pulling by blades and free descent of liquid, ensuring an evaporation speed almost 30 times that of an upright agitation vessel.
Liquid surface formed
by spectacle-shaped blade
Self-cleaning mechanism ensures complete mixing
Since this agitation blade mechanism has a self-cleaning capability, there is virtually no dead space in the vessel. This ensures completely uniform mixing in the radial direction.
Distribution diagram of polyester polymer
degrees of polymerization
Structure of the Spectacle-Shaped Blade Polymerizer.
To seal the shaft, a mechanical seal is used that is specially designed for adverse operating conditions. This highly reliable driving unit makes possible the Long-life performance of the polymerizer.
degrees of polymerization
Mechanical specifications
| Charge quantity | 6 liters to 10 m3 |
|---|---|
| Rated temperature, pressure | 350ºC, FV to 1 MPa |
| Viscosity | 10 to 5000 Pa.s |
| Material | Stainless steel, titanium and other special materials |
| Rotation speed | 5 to 50 rpm |
| Shaft seal | Ground seals, Mechanical seals |
Spectacle-Shaped Blades Enhance Hitachi's Line-Up of Polymerizer.
From planning to maintenance, we are putting in place an integrated support system.
Example of applicable processes
Continuous polymerization of polyester
Continuous polymerization of nylon 66
Hitachi Spectacle-Shaped Blade Polymerizer.Numerous Achievements Attest to Its Outstanding Functionality.
360 ton/day PET polymerizer for Hitachi new continuous process with 3 reactors.
Vessel Volume : 71.7m3
Diameter x Length : 3.5m x 9.0m
Motor Power : 132kW
Inspection of polymerizer at Kasado production control div.
