Depending on the vessel volume and application, reaction time may vary between 12 to 20hrs.
The most preferred vessel sizes of Özköseoğlu Polyester Polyol Reactors are 12, 18, 24 and 30m3 orderly intermediate sizes are also available upon request.
Alternatively, Polyester Polyol Process may be in 3(three) steps
1) Pre-Blending of Diacids and Glycols at a certain temperature prior to polyesterification.
2) Polyesterification Process in a Batch Reactor with fully equipped with separation column, reflux system, over head condenser.
3) Post Blending process for cooling and treatment with additives.
The heating of Polyol Reactors is assured with high thermoresistant fluids by Thermal Oil Heaters. Özköseoğlu Heaters are designed to operate with optimum Delta T heat transfer efficiency to insure final Polyol resin suits TDS parameters as well as market.
The polyesterification reaction in Polyester Polyol Reactor is an equilibrium reaction, the equilibrium is pushed to the polyester formation by continuous removal of water.
The water is eliminated from the reaction system through a separation column, which assures a separation of water from the glycols, Özköseoğlu separation columns are equipped with all necessary packing materials and reflux system to ensure minimal fouling effect.
Glycols are returned back into the polyol reactor and water is condensed and discharged for a post treatment. Özköseoğlu Polyol Reactor system designed for an optimum Glycol reflux ratio to assure a cost effective production.
Polyester Polyol resin reaction may require catalysts during full vacuuming to lower the acid value between 0-2 mg KOH/g by measuring the quantity of water distilled and as well as determination of acid number, hydroxyl number and viscosity.
Özköseoğlu Polyol Reactor system technology offers such analysis to be monitored continuously (by in-line instruments) and recorded over operator panels. All critical stages of the process is automated with default interlock system for an optimum efficiency.
Typical values and characteristics of some polyester polyols for elastic polyurethanes
|Functionality, f||2||2||2.4 - 3.0|
|Hydroxyl number, mg KOH/g||35-45||52-58||50-60|
|Acidity, mg KOH/g||<2||<1||<2|
|Water content, %||< 0.15||< 0.15||< 0.15|
|Density at 20 °C, g/cm3||1.19||1.27||1.2|
|Viscosity at 70 °C, mPa-s||1100||450||1000-1500|
|Applications||Flexible foams, elastomers||Elastomer, prepolymers, synthetic leather||Flexible foams, lacquers, coatings|
Depending on the application raw materials for a Polyester Polyol Resin process maybe ed among chemicals below.