I D
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More BUSINESS NEWSTECHNICAL & PRACTICALFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEEQUIPMENT & SERVICESFOCUS
Focus on Drones
Autonomous inventory management for stockpiles This company has launched an…
NEW PRODUCTS + Show More SHOW PREVIEWS

Comment PDF Separation Processes

Facts at your Fingertips: Distillation

By Scott Jenkins |

Computer-generated simulations of distillation processes are often validated experimentally. This reference discusses three concepts that influence comparisons between experimental results and simulation predictions: vapor-liquid equilibrium (VLE) of the components; relative liquid-to-vapor flowrates (L/V ratios in the column); and vapor-liquid contactor (tray) efficiency. Understanding these concepts can help explain discrepancies between experimental data and simulation results. Vapor-liquid equilibrium The relative volatility of an ideal binary chemical system is equal to the ratio of the two pure-component vapor pressures. If the components’ interactions are close to ideal and the components have sufficient relative volatility (>2), then small errors in VLE predictions may not significantly affect the separation. However, if the relative volatility is small (<1.5), deviations between predicted and actual VLE will lead to large differences between the actual and predicted number of stages required to accomplish the separation. Non-ideal systems often have a pinch at the upper or lower end of the binary VLE curve (vapor and liquid compositions of both components are nearly equal). The pinch is usually at the upper (right-hand)…
Related Content

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Non-Contacting Gas Sensors Minimize the Risk of Corrosion to Plant Equipment.
5 ways to Optimize Production of Polymers and Intermediate Petrochemicals
7 Ways to Achieve Process Safety in Chemical Production
Five Reasons Why Chemical Companies Are Switching to Tunable Diode Laser Analyzer Technology
Simplify sensor handling and maintenance with ISM

View More

Live chat by BoldChat