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The removal of solvent from solids (polymers, films, construction materials, mine tailings, etc.) is a vital step of many manufacturing processes. However, it is often not well understood. This lack of understanding has caused some to conclude that all that is required to remove the solvent is to increase the solids temperature to the boiling point of the solvent. This is erroneous when either or both equilibrium and kinetics are considered.
When equilibrium is considered, it is often estimated by simulating the solid as the highest boiling material in a computer data base and using solvent properties assuming no non-ideality between the solvent and solid. This is almost always inadequate because with most of these solvent-solid systems, there is a significant non-ideality that causes a lowering of the solvent vapor pressure as the solvent concentration is decreased. In addition because of the complex nature of the solid, mass transfer of solvent from the solid to the gas phase is often a limitation.
Attempts to simulate this limitation often assume that the solid is a dense sphere or other shape of uniform consistency. While this may be the case, the solid is often a porous material with a surface area that is much larger than that calculated from various shape equations.
This seminar will enable students to:
Gain an appreciation for the need to include non-ideality during any study of removal of solvent from solids by the presentation of theory, actual real life situations and example problems.
Determine the equilibrium between the solid and solvent. Techniques for determining the equilibrium between the solvent and solid are provided for both the cases where experimental data is available and the case where either minimal or no experimental data is available.
Instruction is also provided to allow the student to deal with the kinetic limitation of the devolatilization process. The kinetics involve considerations of surface area, driving force, and mass transfer coefficients. The driving force can be determined from equilibrium and material balance concepts. However sufficient data rarely exists to determine surface area and mass transfer coefficients separately. An approach which combines these two variables is presented.
This approach is discussed for different types of equipment. That is different equipment will have different values of this pseudo mass transfer coefficient. This approach allows scaleup from bench scale and pilot plant scale to commercial size equipment. Examples of this for different type of equipment and different systems are given.
Recommended for:
Chemical Engineers
Mechanical Engineers
Polymer Professionals
R&D professionals
Instructor:
Mr. Joe M. Bonem
Chemical Expertise
Schedule: 8:00 AM to 4:00 PM
Special Offer! Register for any two courses and use coupon code "16pdh" (no quotes) to receive a 10% discount on the total purchase.