AIChE | The Global Home of Chemical Engineers
Travis W. Walker
Before solar and wind energy can be widely exploited, a method for storing the energy provided by these intermittent sources and releasing it as demand arises must be developed.
John A. Williams
A few basic types of bioreactor designs are used to produce a wide range of products, from antibiotics to foods to fuels. Here's how to pick the best options for your application.
The common assumption that for real liquids cv can be approximated by cp is not correct. To get accurate cv values, use equations of state.
Fieldbus technologies have become increasingly popular in process control applications. This article highlights the practical applications and economics of various buses, so that an engineer can choose the best one for his or her process.
Joseph W. Hower, Michael P. Scott, Stanley R. Hayes
Follow this procedure for evaluating the strategic importance of greenhouse gas (GHG) issues to your firm and developing a corporate strategy for managing GHGs.
This strategic approach to interviewing will help you handle difficult questions with ease and success.
To function properly at optimum capacity and efficiency, multi-pass trays must be designed so that the liquid and vapor flows are properly balanced. This article provides guidance on how to achieve that.
Richard J. Kinsley
To become a leader people want to follow, focus on the team's objectives, avoid self-deception, build strong relationships, and enable others to achieve the team's goals.
Modular design principles are well known, but have found only niche applications in the Chemical industry. This article outlines an innovative methodology, whereby plant and process design may be conducted in parallel using components with pre-...
Henry Z. Kister
When designing a new distillation column or revamping an existing one, it is important to understand the factors that affect overall tray efficiency.
Membranes offer inherent advantages over absorption-based CO2 capture from post-combustion fluegas and pre-combustion syngas, but numerous design and scale-up challenges remain.
David Hogsett, Youngmi Kim, Michael R. Ladisch, Nathan S. Mosier, Eduardo Ximenes
Biochemical and thermochemical process technologies being developed to convert wood and other lignocellulosic feedstocks to liquid fuels will drive the transition from corn-based ethanol to advanced biofuels.
Bill Carlson, Joe Dumoit, Paul Yanisko, Shiying Zheng
The benefits of nitrogen blanketing include improved process safety, better product quality, and longer equipment life. Here's how to achieve the desired safety or quality results while minimizing costs.
R. Wayne Garland
Using a formal change procedure promotes safe operations and prevents injuries and deaths, and it will also favorably impact the bottom line.
See how these six high-level women in industry and academia got where they are today and what it's like to be a successful woman in a male-dominated field.
Clare Marshall Wood
A coach can help you tap into your potential to achieve your goals and to live a more fulfilling and productive life.
The key to effective job search is organization. Follow this plan to keep you campaign on track and keep track of your campaign.
Colleen McCarthy, John M. Beath
This hybrid technique of determining whether a plant is meeting its regulatory requirements helps overcome the pitfalls of action-tracking and compliance auditing.
The more important question is “how much to engineer?” Use this technique to evaluate the level of engineering effort required, and justified, for a project.
Suzanne A. Shelley
An array of nanoscale developments are poised to revolutionize cancer diagnosis and drug discovery efforts, and create new ways to target the delivery of potent, often toxic drug therapies, while reducing their dose-limiting side effects.
Robert F. Boland
A compliance management system (CMS) helps companies meet regulatory reporting requirements, improve environmental performance, reduce environmental compliance costs, and increase organizational efficiency. Here's a run-down of what to look for when...
Updates in this issue include: State of the Union Address Identifies Importance of Manufacturing and Energy to U.S. Economy Scorpions Inspire Tough Surface Nanorods Line Up for Assembly Nanosphere Structure Boosts Light Absorption Zeolite Catalyst...
Geoffrey M. Spinks, Gordon G. Wallace
Inherently conducting polymers (ICPs) exhibit a variety of dynamic behaviors that make them an exciting platform for a new generation of bionic devices.
Andrew Vieler, Marco S. Satyro, Rajeev Agarwal, Yau-Kun Li, Oscar Santollani
Simulation software is a commonly used design tool, thanks mainly to its availability on the desktop. However, one has to understand thermodynamic basics before accepting the desktop's final answer.
Brad A. Walker, James E. Lenhart, Karen D. Smith
Faced with more distractions than ever, operators need an environment that is conducive for dealing with abnormal, as well as normal, situations. Effective control room design can help.
Julian B. Fasano, Kevin J. Myers, Mark F. Reeder
It is common knowledge that baffles promote better flow in an agitated vessel, but how to apply them and what kind to use take some ingenuity.
Christopher Haslego, Graham T. Polley
Pinch analysis retrofit procedures can be extended to handle compact exchangers.
Mordechai Shacham, Neima Brauner , Michael B. Cutlip
Reduce the chances of computational errors by following this technique, which combines the use of a standard spreadsheet with a numerical software package.
The most successful employee-retention programs begin with recruiting and hiring the individual who best matches the position and best fits into the company's culture.
Many batch operations can be scaled up directly from the bench to the plant by developing the process and performing lab testing with the scaleup in mind.
Brian H. Pittenger, Herman Purutyan, Gabriel I. Tardos
Use these guidelines to avoid potential caking problems. The key steps are to select a material characterization method, identify the factors that can be feasibly controlled and conduct tests to confirm that process/handling changes yield the...
Stephen W. Maas
This comprehensive overview of what needs to go into a well-defined scope of work will be useful to chemical engineers who are new to project engineering and project management.
Andrew J. DeDoes, Matthew D. Goetz, Michael J. Misovich
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.
Madhura Chiplunkar, Vivek Julka, Lionel O’Young
This systematic methodology uses residue curve maps to identify and evaluate substances that can facilitate distillation by breaking an azeotrope.
Decision-makers often require cost estimates for products and processes at the earliest stages of development — when many cost-determining factors remain uncertain. Identifying variables that impact cost estimates, and putting them in context, will...
Specialty metals should be considered for processes that push beyond the corrosion limits of steel. New composites and surface alloy technologies expand the options for defending against corrosion.
The median salary among chemical engineers is $84,000, and annual raises are averaging 4.8%.
Many safety instrumented systems rely on dissimilar redundant field devices, and this can complicate required analyses. These equations will enable field personnel to handle such situations readily.
Here's how to take stock of your career and identify and explore a wide range of opportunities so you can decide where you want to go and develop a career plan for getting there.
David Jaber, Fred L. Hart, Gilbert A. McCoy
These tips on how to improve steam generation, distribution and recovery can help a plant to increase its steam system efficiency by as much as 20-30%.
Jerry R. Johanson
By understanding solids' properties and what promotes flow, problems faced in the plant can be remedied
Stephen D. Able
Simulation can help to ensure proper design and performance. Checks can be made for possible problems such as cavitation, and the pump and system can be modified to prevent trouble.
Aristos Aristidou , J. J. Hahn , Pim van Hoek , Alex Patist
Designing an economically competitive and environmentally sustainable fermentation route means considering the downstream separations needed to capture the final product during the initial process design.
Tangential flow filtration (TFF) is commonly used to concentrate and dialyze solutes. It generally involves the circulation of the feed solution over a filter surface. This article presents a brief overview of the principles governing TFF, and...
Jeffrey D. Kelly
Optimize petroleum and petrochemical plant production by understanding the mathematical modeling behind nonlinear planning models.
Donald F. Schneider
The regeneration of sulfolane, a common extraction solvent, is difficult. With proper attention to design and operation, problems can be minimized.
Robert T Jacobsen
When selecting a precious metals refiner, it’s important to first understand the basics of sampling, assaying and environmental issues, as well as the concept of leasing metal.
Using a phased engineering approach to guide R&D projects will improve efficiency and avoid costly experimental excursions.
Propelling an odorous exhaust stream high into the air at a high velocity is often an effective way to eliminate odors.
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.
Scanning with an optical imaging camera is a faster, cheaper method of finding leaks in a maze of process equipment.
Engineers typically don’t learn the “soft skills” of team and project management in school. Here is a game plan to help you supplement your technical expertise with effective leadership.
David S. Dickey, Gary K. Patterson
Understanding when and why mixing fails in the laboratory is often the only way of avoiding a similar failure in a production-scale reactor. Here we examine mixing in stirred-tank reactors and provide guidance on scale-up.
Jeffrey H. Siegell
Process plants must report emissions from an increasing number of sources. Use these pointers to prepare more-representative emissions inventories.
Lisa L. Walker
Few situations can be more anxiety-provoking than a job interview. Although the skills required for a successful interview may not come naturally, they can be honed — with practice, introspection, and informed preparation.
Dennis O'Brien, Douglas A. Stewart, James W. Harris, Michael A. Schultz, Mohamed S.M. Shakur, Steven P. Rosenblum
These distillation columns can significantly reduce capital and energy expenses vs. conventional multicolumn arrangements.
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.
Michael J. Gentilcore
For solid compounds that dissolve in solvents but do not ionize, the thermodynamics of solubility can provide valuable predictions and insights.
Charles M. Mitchell, David T. Moyle, Abraham Shamir
This simple reliability analysis technique can differentiate among design options and guide engineers to a preferred alternative.
Options abound, but operators need to balance performance and safety considerations.