CHEMCAD Dynamics is a remarkable tool for operator training. The example shown is a distillation column that looks like a Piping & Instrument Diagram. Each control loop can be modified by changing the proportion, integral and derivative values. The model responds similarly to a plant distillation column. Liquid holdup in the column, heat exchangers and even piping can be … [Read more...]
Eliminating Fouling Reboilers in Continuous and Batch Distillation
Continuous Distillation with a Fouling Reboiler A large chemical plant operates a fouling reboiler with forced circulation on a distillation column. When allowing boiling in the tubes, the operation suffers from severe fouling of the exchanger. Suppressing the evaporation in the tubes by installing a throttle plate in the reboiler outlet did not inhibit fouling. The … [Read more...]
Fluidized Bed Multi-Effect Evaporators in Bio-Ethanol Plants, an Energy Efficient Solution
In bio-ethanol production, a large portion of a plant’s energy demand is consumed at the rotary dryers where moisture content of wet distiller grains with solubles (WDGS) is reduced to values of around 10%. Using fluidized bed Multi-Effect Evaporators (MEE), instead of conventional forced recirculation evaporators, prior to these dryers allows one to significantly … [Read more...]
Fluxxion Metallic Membranes for Absorption, Stripping & Distillation – Part 2
In this second part of the series on the Fluxxion metallic membrane we are going to discuss two applications. Below we show the gas liquid interface that occurs at each pore. The following example demonstrates the stripping of Methyl Tert-Butyl Ether (MTBE) from water with the Fluxxion Metallic Membrane. Stripping of MTBE from Water The stripping MTBE from water by … [Read more...]
Sodium Hydrosulfide (NaSH)-An Alternative to Sulfur Production
Introduction Sodium Hydrosulfide (NaSH) solution is an alternative product to sulfur from hydrogen sulfide. Much hydrogen sulfide ends up on solid bed medias such as iron sponge or Sulfatreat®. This is disposed of in landfills. These processes are justified in most cases. Depending on your production rate of hydrogen sulfide, a Claus Unit may be just what you need. However, … [Read more...]