AIChE

Choosing Trays and Packings for Distillation

September
2009
Back To Basics
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Mark Pilling
Bruce S. Holden
Tower-related problems can be difficult, time-consuming, and expensive to diagnose and fix. Here’s how to avoid difficulties and improve operating efficiency.

Expanded Metal Networks: A Safety Net to Thwart Gas Explosions

December
2001
Safety
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Hans K. Fauske
Robert E. Henry
Using active deflagration suppression is the usual way to prevent or mitigate gas explosions. However, this is not always practical. A passive method is now available - inserting a metal foil into the vessel to absorb the heat of reaction and...

Using Chromatography to Separate Complex Mixtures

December
2010
Back To Basics
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Nathalie Fraud
Purifying high-value mixtures, such as pharmaceuticals, can be an expensive undertaking. Choosing the correct chromatography methods can improve purity and reduce processing time and cost.

Co-Inventors: Who Owns the Patent Rights?

June
2012
Patent Update
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M. Henry Heines
A joint invention arises from the combined efforts of two or more inventors. Once a patent is granted, however, the inventors do not necessarily share in the rewards.

Nanotechnology: Cause for Concern?

September
2007
News Feature
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Kristine Chin
Nanotechnology— it's a small science with big stakes. Some of the unique properties that make nanoscale materials useful may also pose hazards to humans and the environment. Can the EPA find a way to effectively regulate these tiny high-tech...

Saluting AIChE’s Centenarians

November
2008
Centennial
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In honor of AIChE’s 100th birthday, we recognize two members who have each celebrated more than 100 birthdays.

Valves 101: Types, Materials, Selection

March
2009
Back To Basics
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Brian Gordon
The most common valves used in chemical processing are ball valves, butterfly valves, diaphragm valves, and check valves.

Science on a World Stage

July
2008
News Feature
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Gordon Ellis
The first annual World Science Festival takes Manhattan by storm, with 120,000 people celebrating scientific diversity.

Virtualizing Your Process Control Computers

January
2012
Instrumentation
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Paul Hodge
By employing the latest virtualization solutions for process control systems, chemical plants can reduce PC hardware requirements, simplify system management, and lower the total cost of ownership, as well as improve site availability, reliability,...

Whatever Happened to the Class of 2009?

September
2009
News Feature
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Gordon Ellis
Regardless of their current employment status and personal outlook, the new class of chemical engineering graduates is con?dent that they possess a unique versatility and capacity to make good and do good.

Classifying Reactive Chemicals

March
2004
Safety
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M. Sam Mannan
Sanjeev R. Saraf
William J. Rogers
This simple classification scheme can be used to characterize the thermal instability risks posed by reactive chemicals in a process.

Audit Your New EHS Software System

October
2004
Environmental Management
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Jill Barson Gilbert
A post-implementation audit of the environmental, health and safety management information system evaluates how well the software meets user needs and its value to the organization.

Measuring Temperature by Direct Contact

September
2011
Back To Basics
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Gary Freemer
Thermocouples and resistance temperature detectors are the most common contacting temp­erature sensors. Understand the techniques and apply them correctly to increase your temperature measurement accuracy.

Properly Purge and Inert Storage Vessels

February
2001
Safety
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George R. Kinsley Jr.
Inert gases are used to prevent fires and explosions in the vapor spaces of equipment. Correct selection of oxygen concentration and inert gas flow rate are critical to ensuring safety.

Minimize Enforcement Penalties

July
2001
Environmental Management
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Jessica L. Idzerda
Identify possible New Source Review/Prevention of Significant Deterioration penalties by conducting an internal audit and disclosing potential violations.

Preventing Pollution Around the World

November
2001
Environmental Management
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J. J.  Rao
By implementing these strategies at all of its overseas facililities, an international corporation can reap such benefits as increased efficiency, reduced costs and a positive public image.

Choose the Right Gas Sensor

September
2009
Instrumentation
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Sandra Barnes
Selecting a sensor for continuous monitoring involves many considerations. This article discusses the types of sensors available, their applicability and limitations, and how to choose an appropriate sensor to protect people and equipment.

Improving Reverse Osmosis Performance

September
2010
Reactions and Separations
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Loraine Huchler
Follow these guidelines for monitoring, evaluating, and troubleshooting RO units to ensure reliable and efficient system operation.

Process Synthesis: Poised for a Wider Role

April
2001
On The Horizon
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W. R. Johns
Software for generating process designs has made relatively limited inroads so far. But, it now is set to follow simulation and become a tool routinely used by chemical engineers.

Test Your Incinerator Knowledge

February
2003
Environmental Management
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Richard J. Martin
Do you feel like you're in the dark? Take this quiz to find out how much you know about thermal oxidizer selection and operation.

Exploring Instrumentation Alternatives

September
2008
Instrumentation
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Robert Baker
Salvaged, remanufactured, refurbished or new-surplus equipment may be a cost-effective option. Here's how to recognize when such devices may no longer meet safety or regulatory requirements.

Should Your Organization Fly Warning Flags?

December
2009
Safety
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Ian Sutton
In the safety culture of some companies, the first recognition of trouble may be a sudden and massive failure. Learn how to decipher the warning signals to avoid safety incidents. <BR><BR>

Agitating Fibrous Materials

June
2010
Back To Basics
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Gregory T. Benz
Slurry agitation involves complicated processes. This article presents guidelines for understanding the rheology of cellulosic and other fibrous materials, and outlines a method for scaling up their agitation.

Screening Reactive Chemical Hazards

May
2006
Safety
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Yen-Shan Liu
Use these tools to identify potentially reactive chemical hazards and avoid the expense of conducting numerous detailed hazard assessments.

Plant Security Remains a Moving Target

May
2008
News Feature
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Cynthia F. Mascone
While chemical companies work toward complying with existing standards, legislators are poised to revise those very rules — with changes ranging from minor tweaking to major overhaul on the table.

Converting a Commercial Distillation Column into a Research Tower

July
2005
Reactions and Separations
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Ralph Weiland
Operating a column under actual distillation conditions is important for obtaining commercially valid hydraulic data. This article describes how a column was modified to operate in either a production or a research mode to collect hydraulic and mass...

Create Effective Process Safety Moments

May
2010
Safety
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Deborah Luper
Process safety topics are underrepresented in safety communications. Here are ideas on how to convey your organization’s safety priorities in messages tailored to the audience.

Saving Energy in Multilevel Steam Systems

January
2012
Back To Basics
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Wiroon Tanthapanichakoon
Avoid some common pitfalls by taking this holistic approach when implementing projects to reduce the consumption of steam.

Prepare for a Different Future

February
2001
Opinion
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Calvin B. Cobb
The U.S. industrial landscape is changing dramatically. This has significant implications for our profession and individual chemical engineers.

Controlling NOx Emissions - Part 1

March
2002
Environmental Management
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Mike Bradford
NOx emission standards are becoming very tight, especially in the Houston area and in Southern California. Among the technologies to meet these standards are process modifications and energy efficiency improvements, as well as advanced burner...

Simplify Reliability Analysis of Chemical Processes

July
2002
Safety
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Farshad Nourai
Originally developed for discrete manufacturing, this method can be applied to process units to detect which components may fail, and correct the situation before trouble happens.

Understand the Capabilities of Bio-Oxidation

December
2002
Environmental Management
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James T. Boswell
Relatively uncomplicated design and simple operation and maintenance requirements make biofiltration a good option for many types of air emissions control.

Use Logic Diagrams to Analyze Failure Mechanisms

June
2005
Safety
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Thiago Tinoco Pires
Here’s how to construct and apply continuous-value and single-value network diagrams, which can better represent system failure mechanisms than other logic diagrams.

What’s New Then and Now - Part 1

November
2008
Centennial
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Matthew McKeon-Slattery
This special products section looks at some of today’s equipment and service offerings alongside product write-ups and ads from the past.

Process Simulation from the Ground Up

April
2009
Back To Basics
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David Hill
Today's process simulators produce graphical, data-filled and detailed results that can improve the effectiveness of the engineers who use them.

Managing Transportation Safety and Security Risks

October
2009
Safety
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Brad A. Fuller
Effective transportation risk management (TRM) balances safety and security with operational efficiency. When developing a TRM program, use this comprehensive framework and these practical techniques to identify and screen risks.

CEP: Institute News

July
2012
Institute News
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Focusing on the 2012 Institute elections, this issue features candidate platforms.
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