Separations

Squeeze More Out of Complex Columns

July
2002
Reactions and Separations
Piyush Shah
These distillation setups can cut capital and operating costs by up to 30%, and increase separation efficiency. Here is a straightforward method for evaluation.

Evaluating and Documenting Tower Performance

February
2010
Reactions and Separations
Daniel R. Summers
A good performance evaluation can lead to a significant improvement in column performance and establish a basis for future tower evaluations. <br>

Selecting a Membrane Filtration System

December
2004
Fluids and Solids Handling
Wu Chen
Proper design and scaleup of a membrane filtration system requires an understanding of the availability of membrane material, pore size and module configurations. These practical guidelines will help in the selection process.

Pervaporation Comes of Age

October
2001
Reactions and Separations
Nick Wynn
This membrane process has found growing use for dehydrating organics. Uses keep increasing, mostly due to development of new, high-temperature membranes.

Ionic Liquids for Aromatic Extraction: Are They Ready?

December
2006
Reactions and Separations
Sachin T. Anjan
Ionic liquids have already moved into the commercial arena as reaction solvents. This article compares them to conventional solvents and examines their potential for the extraction of benzene, toluene and xylene from reformate.

Can We Believe the Simulation Results?

October
2002
Reactions and Separations
Henry Z. Kister
Be careful of these key issues that may generate differences between a distillation-tower simulation and its actual performance. Simulations do not always square with nuts-and-bolts reality.

Designing Four-Pass Trays

April
2010
Back To Basics
Daniel R. Summers
Use this procedure to design four-pass distillation column trays and to balance the vapor/liquid ratio on each tray panel.

Size Letdown Lines for Pressure Surges

November
2001
Fluids and Solids Handling
Gianni  Anci
A high-pressure gas flow in a letdown circuit can cause damage to piping and equipment. Here is how to design a system to avoid damage should a pressurized gas flow occur GianniAnci-

Dividing-Wall Columns Find Greater Appeal

May
2007
News Feature
Gerald Parkinson
Conceived more than seven decades ago, dividing-wall columns are now only gaining widespread acceptance. The reasons— the drive to save energy and advances in computer technology that have overcome the burden of doing complex column internal designs.

Navigate Phase Equilibria via Residue Curve Maps

November
2002
Reactions and Separations
Waldo E. de Villiers
These maps provide a rapid, graphical means to visualize the separation possibilities and constraints of azeotropic ternary systems. They also help check the soundness of models used to predict equilibrium data.

Preventing Maldistribution in Multi-Pass Trays

April
2010
Reactions and Separations
Henry Z. Kister
This method, based on hydraulic equations in the open literature, calculates vapor/liquid distribution in four-pass trays to correctly predict flooding and efficiency.

Solving Phase Equilibrium Problems

September
2008
Reactions and Separations
James R. Reinhardt
Use this optimization-based approach to analyze multi-component, multi-phase Equilibria.

Avoid Sulfolane Regeneration Problems

July
2004
Reactions and Separations
Donald F. Schneider
The regeneration of sulfolane, a common extraction solvent, is difficult. With proper attention to design and operation, problems can be minimized.

Effectively Control Column Pressure

January
2001
Reactions and Separations
Andrew W. Sloley 
Maintaining proper pressure can play a crucial role in the stable operation of a distillation column. Here’s how to select the most appropriate pressure-control scheme.

Teach Yourself the Basics of Aspen Plus

January, 2011
Aspen Plus is on of the most popular process simulation software programs used industrially and academically. Though the software is available at many corporations and universities, there are no textbooks which are dedicated to teaching the step-by-step use of the software. This book is designed to...

Reactive Distillation Design and Control

October, 2008
After an overview of the fundamentals, limitations, and scope of reactive distillation, this book uses rigorous models for steady-state design and dynamic analysis of different types of reactive distillation columns and quantitatively compares the economics of reactive distillation columns with...

Advanced Membrane Technology and Applications

September, 2008
Advanced membranes-from fundamentals and membrane chemistry to manufacturing and applications A hands-on reference for practicing professionals, Advanced Membrane Technology and Applications covers the fundamental principles and theories of separation and purification by membranes, the important...

Distillation Design and Control Using Aspen Simulation

April, 2006
As the world continues to seek new sources of energy, the distillation process remains one of the most important separation methods in the chemical, petroleum, and energy industries. And as new renewable sources of energy and chemical feedstocks become more universally utilized, the issues of...
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