AIChE

Harness Electricity to Operate Valves

June
2012
Back To Basics
Justin Ledger
Actuators automate valves by converting an input signal into motion. This article explains the basics of electric actuator design and explores the different types of electric actuators.

Mohsen Almajnouni: Progress is a Process

June
2012
Profile
For Almajnouni, Process Domain Manager at Saudi Basic Industries Corp. (SABIC) and long-time chair of AIChE’s Saudi Arabia Local Section, progress is a byword in a life shaped by the will to embrace change.

The Case for Double Mechanical Seals

June
2009
Back To Basics
Jack Berg
Using double mechanical seals as part of thermoplastic pumps can prevent costly downtime and environmental damage.

Producing Nitrogen via Pressure Swing Adsorption

June
2012
Reactions and Separations
Robert Lewis, Svetlana Ivanova
Pressure swing adsorption (PSA) can be a cost-effective method of onsite nitrogen generation for a wide range of purity and flow requirements.

Optimize Energy Use in Distillation

March
2012
Reactions and Separations
Douglas C. White
Nonlinearities in the response of a column to changes in operating conditions and in common economic valuation functions can have significant impacts on the economic optimum energy consumption for the column. Here’s a way to account for such...

Decoding Safety Data Sheets

June
2012
Safety
Ronald J. Willey
A safety data sheet holds a wealth of information that can help you safely and effectively handle chemicals in the lab, at the pilot scale, and on the production floor.

What Will Happen to the Balloons?

June
2012
Editorial
Cynthia F. Mascone
They might be more expensive, but there’s probably no need to cancel your party plans just yet. “There’s lots of helium out there” says John Van Sloun, general manager — worldwide helium at Air Products, “but very little of it is being captured because the economics of doing so are not favorable.”

What's New - Expo Preview

June
2012
What's New?
Read about products and services on display at the Air and Waste Management Association Annual Conference and Exhibit.

What's New?

May
2012
What's New?
See the latest in laboratory equipment—benchtop meters featuring intelligent sensors, instrumentation, operations and maintenance, and materials.

The Chemical Industry Phoenix

June
2012
Process Automation Corner
Terry McMahon
Seven years ago, I wrote a column for another publica­ tion entitled “The U.S. Chemical Industry: R.I.P.” This pillar of American economic strength, which a few years earlier was the leading exporter among U.S. manufac­turing sectors (with net exports of $15–20 billion annually), was shriveling due in large part to policy blunders and regula­tory mistakes.

Advance Your Career in 8 Words or Less

August
2002
Special Section
Kate Wendleton
A short, simple and concise message can be an effective way to let others know about your accomplishments and your worth.

Nitrogen — Hazard and Safeguard

June
2012
Process Safety Beacon
This Beacon is not focused on a single incident, but on incidents that continue to occur across industry — nitrogen asphyxiation.

Physical and Chemical Equilibrium for Chemical Engineers

April, 2012
This book concentrates on the topic of physical and chemical equilibrium. Using the simplest mathematics along with numerous numerical examples it accurately and rigorously covers physical and chemical equilibrium in depth and detail. It continues to cover the topics found in the first edition...

Good Drug Therapy: It's Not Just the Molecule - It's the DELIVERY

February
2004
Special Section
Rita D'Aquino
In today's competitive marketplace, biopharmaceutical companies are seeking effective and user-friendly drug-delivery platforms for their drug molecules. Miniaturized, microfabricated and nanofabricated devices that can be implanted in the body are...

Clarifying Centrifuge Operation and Selection

August
2004
Fluids and Solids Handling
Victor Norton ,  William Wilkie
Before selecting a centrifuge for your application, understand its principles of operation and investigate the key process variables.

Pumping System Head Estimation

February
2005
Fluids and Solids Handling
James Anthony
These spreadsheets highlight losses, uncertainties and value of power used, helping you optimize pumping system designs and save on operating costs.

Fulfilling the Promise of Nanomedicine

February
2006
SBE Special Section
Cristina Roman Vas, Rita D'Aquino with Tim Harper
Leveraging nanotechnology in the life science industries has given scientists new tools with which they have the potential to transform the world of medicine.

Tools to Model Multiphase Separation

June
2007
Fluids and Solids Handling
David Connolly, Saeid Mokhatab, Timothy Newton
The flow fields in multiphase separators are often extremely complicated, making it difficult to model such systems. Computational fluid dynamics (CFD) and visual dynamic modeling (VDM) can be used together to overcome some of the challenges.

Use Model-Predictive Control to Improve Distillation Operations

January
2008
Instrumentation
Daniel R. Webb, Robert D. Rounding, Robert J. Conroy, Umesh Mathur
This methodology, based on steady-state and dynamic simulation, can be used to develop the necessary models— and avoid disruptive and costly step testing to the extent feasible.

Predicting Emissivities of Combustion Gases

June
2009
Heat Transfer
Alireza Bahadori, Hari B. Vuthaluru
Use this new correlation, which employs easy-to-solve algebraic equations to estimate gas emissivities, to simplify the design and optimization of boilers, furnaces and other combustion equipment.

Your Personal Genome for $1,000?

November
2009
SBE Special Section
IBM scientists from four fields — nanofabrication, microelectronics, physics and biology — are collaborating to develop a “DNA transistor” that could make obtaining a personalized genome analysis easier, faster, and cheaper — ultimately as low as $...

Measuring and Communicating Sustainability through Eco-Efficiency Analysis

December
2010
Environmental Management
Bruce W. Uhlman, Peter Saling
Eco-efficiency analysis promotes an understanding of the economic and environmental trade-offs over products’ lifecycles, and supports informed, strategic decision-making in all areas of a business, from spurring innovative product development to...

Selecting the Proper Flare System

July
2011
Back To Basics
Adam Bader, Charles E. Baukal Jr., P.E., Wes Bussman
Flares allow for the safe, effective disposal of gases and liquids, by acting as relief devices when a plant must quickly dispose of product within its system to prevent overpressurization and potential explosions.

Commencement Advice for Young Job Seekers

May
2012
YPOV
Arjun Gopalratnam
This is the time of year when thousands of undergraduates are completing their degrees and beginning their careers and chemical engineers. As I travel to chemical engineering schools to attend AIChE's spring regional student conferences, the...

Women ChEs Make Progress Toward Equity

August
2003
Special Section
Irene Kim
Women in the chemical engineering profession are gaining equality -- to varying degrees -- in numbers, salary and worklife environment.

Process Control for Microreactors

August
2001
Instrumentation
Don  Humbert, Lech  Znamirowski, Olgierd A. Palusinski, Sarma Vrudhula
Field-programmable analog arrays coupled with microreactor technology promise to change the way plants are built, as well as the methods by which their processes are designed and controlled.

Improve Your Reading Efficiency and Speed

March
2003
Career Catalyst
Robert W. Bly
Are you feeling overwhelmed by the daily influx of memos, letters, reports and journals? These tips will help you develop a systematic method for dealing with the endless stream of material that is essential to your job.

Preparing for GHG Inventory Verification

April
2004
Environmental Management
- Lauren M. Sandler, James T. Wintergreen
To ensure that the greenhouse gas inventory is accurate and complete, prepare for eventual third-party verification during the planning and data collection stages.

Improve Solids Handling During Thermal Drying

November
2004
Fluids and Solids Handling
Herman Purutyan, John W. Carson, Thomas G. Troxel
Follow these guidelines for ensuring the proper flow of slurries, pastes and wet powders to achieve a dried product with the desired characteristics.

Enzyme Discovery: Screening, Cloning, Evolving

October
2005
SBE Special Section
Glenn Nedwin, Per Falholt, Thomas Schaefer
Enzymes are nature’s answer to many industrial and environmental challenges. This article details the latest approaches to enzyme discovery and evolution.

Educational Perspective on the Future of Chemical Engineering

January
2007
Special Section
Gary K. Patterson, James T. Cobb Jr., S. Ranil Wickramasinghe
Diversification, globalization, emerging technologies...Times have certainly changed for chemical engineers. But, has the undergraduate chemical engineering curriculum kept pace?

Properly Select Equipment for SIP Systems

August
2007
Fluids and Solids Handling
Tony George
Sterilization-in-place (SIP) systems are essential to the operation of many pharmaceutical and biotech facilities. This article reviews design considerations, selection criteria and performance expectations for control valves, regulators, isolation...

Analyzing Equilibrium when Noncondensables Are Present

April
2008
Environmental Management
Allen Hatfield
With the simplifying assumption that all of the noncondensable gases exit via the vapor stream, material balances and equilibrium calculations can be used to determine the compositions of the emissions streams leaving a control device.
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