2007

A Simple Approach to Vapor Pressure Prediction

January
2007
Reactions and Separations
Andrew J. DeDoes
This method reproduces the vapor pressure predictions of the Soave-Redlich-Kwong and Peng-Robinson equation of state with a simple Antoine equation that uses constants derived from critical properties and the acentric factor.

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.

A Renewable Route to Propylene Glycol

August
2007
News Feature
Suzanne Shelley
Rapid expansion in biodiesel production has spurred a bumper crop of competing processes to turn byproduct glycerin into propylene glycol.

The G-Value for Agitator Design: Time to Retire It?

March
2007
Fluids and Solids Handling
Gregory T. Benz
This commonly used number does not correctly address the influence of viscosity, and has no relationship to performance parameters such as fluid velocity and blend time. This article recommends actual measures of agitator performance that should be...

Deciphering the Mechanisms of Therapeutic Protein Production

October
2007
SBE Special Section
Daniel W. Allison
Demand for therapeutic recombinant proteins will eventually exceed current production capabilities. This is a major driver in further understanding Chinese Hamster Ovary (CHO) cell biology, which is the cell line of choice for producing these...

Controlling Emissions During Cold Furnace Startup

February
2007
Environmental Management
Charles E. Baukal Jr.
High carbon monoxide emissions from a furnace while its temperature is being ramped up can exceed permit limits if appropriate measures are not taken. Here are a few suggestions.

Improve Catalytic Oxidizer Operation

January
2007
Environmental Management
John C. Bonacci
A catalyst guard bed is a simple, low-cost modification that reduces catalyst-replacement costs, saves natural gas and cuts energy expenses.

Avoid Common Pitfalls When Using Henry's Law

September
2007
Environmental Management
Francis L. Smith
Here is practical guidance on the use of Henry's law in engineering calculations and how to account for the temperature dependence of the Henry's constant— which is often ignored but which can be crucial for accurate process design.

Selecting Nickel Alloys for Corrosive Applications

May
2007
Materials
Paul Crook
Nickel and its alloys offer resistance to attack by a wide range of chemicals, including acids, alkalis and salts, making these materials suitable for may CPI applications.

Streamlining the Validation Process

March
2007
Management
Tim Flanigan
Today, validation is no longer an afterthought for the design and construction of a new or renovated process or facility. It is, in fact, recognized as an integral part of the total project. Fully integrated services are now available to ensure a...

Predesign for Pollution Prevention and Control

June
2007
Environmental Management
Gael D. Ulrich
A plant's intrinsic cleanliness is determined during the predesign stage. This article provides guidance for making critical decisions during preliminary design.

Succeed in the Workplace

January
2007
Career Catalyst
Stan Sebastian
This top 10 list covers things you may never have been told about the real world.

Is Your Cold Lime Softener Effective?

December
2007
Reactions and Separations
Loraine Huchler
If your plant's utility system is experiencing problems, the culprit may be the clarifier. Understanding how to diagnose and correct off-spec clarifier operation will allow downstream units to function more efficiently and reliably.
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