AIChE | The Global Home of Chemical Engineers
Understand what kind of pressure-relief valves you have in your plant, and know what you must do to ensure that they work properly.
Artiﬁcial Organs Hot Off the Press; Biofuel Byproducts and Concrete Mix It Up; Squid Inspires Material for Medical Implants; Polymer Chains Line Up to Provide High Performance; Ribbons of VO2 and Graphene Enable Ultrafast Batteries; and more.
An entrepreneur is someone with a certain attitude — a mindset — a way of looking at the world,” reﬂects Loraine Huchler, winner of the 2012 Society of Women Engineers’ (SWE) Entrepreneur Award. Huchler, founder and president of MarTech Systems, Inc...
Choosing a ﬂowmeter with a low permanent pressure loss can reduce pump or compressor work requirements and increase steam boiler capacities — thereby trimming annual energy costs.
Emily Thorn Corthay, Megan Dover, Robert Griesbach, Robert Storey
Formal energy design reviews help to ensure that energy is treated as a key factor in decision-making throughout the various stages of a design project. This approach can signiﬁcantly improve a site’s energy performance. An energy design review (EDR...
Leaks in fluid-containing castings, such as pumps and valves, present major problems for chemical processing plants. To address this issue, the Materials Technology Institute (MTI) funded a casting quality prediction project aimed at developing a...
John T. Santini, Jr.
Drugs can be administered by many routes, yet all emerging drug delivery technologies aim to improve drug efficacy, minimize side effects, and reduce the burden of care for patients and physicians.
Chattering is the rapid opening and closing of a pressure-relief valve. The resulting vibration may cause misalignment, valve seat damage, and, if prolonged, mechanical failure of valve internals and associated piping. Some causes of chattering...
W. Mark Saltzman, Junwei Zhang
Engineered nanoparticles can deliver therapeutic agents to specifically targeted cells and then release those agents in a precisely controlled manner. Improved pharmacokinetic properties, reduced toxicity, and the ability to cross biological barriers are some of the key benefits of this approach.
News Feature: Graphene Marches Down a Long Road to Commercialization A Stretchable, Rechargeable Li-Ion Battery Makes its Debut Defects Strengthen Magnesium Alloys Gold Lights the Way to Quantum-Dot Solar Cells Japan Taps into Fire Ice A Phase-...
Baffles play a crucial role in regulating shellside fluid flow and improving heat transfer between shellside and tubeside process fluids. Here's how to choose the correct baffle to meet process requirements.
Coriolis meters eliminate the need to measure and correct for pressure, temperature, and density fluctuations to determine mass flowrate. Although their capital costs may be higher, they typically have a lower overall cost of ownership than other types of meters
Gregory T. Benz, P.E.
Yield-stress slurries, such as those used in paper, biofuel, and polymer production, can be difficult to mix. This article explains how to determine torque requirements for multiple-impeller slurry-mixing systems to optimize tank geometry and...
M. Henry Heines
To qualify for a patent, an invention must be both novel and nonobvious. Novelty requires that the invention differ in some way from the prior art, such as earlier patents and published materials. Nonobviousness requires that there be more than just...
Bioprocessing Systems Go disposable: Single-use disposable technology is gaining acceptance in the bio-pharmaceutical arena, especially with processors seeking to reduce their operating costs and add flexibility to their manufacturing schemes...
AIChE’s newest Equipment Testing Procedure provides chemical engineers, plant managers, and other plant personnel with advice for assessing the performance of these important components of petrochemical, natural gas production, air separation and other industrial processes. The book, which...
Lack of labeling can be a safety problem, and poor or confusing labels or information signs can be even worse.
Color-Shifting Fibers Take their Lead from Nature; Nanocapsules Target Cancer Cells without Harming Healthy Ones ; Graphene Straightens Out with Some Help from Copper; Silicon Made Easy for Batteries; and more.
Viewpoint #1 Regulate the Product, Not the Process by Gregory Conko Viewpoint #2 Not All Sugar & Spice
If you manage to stay afloat long enough, past associations inevitably resurface. At a recent Société de Chimie Industrielle luncheon, I reconnected with a client who I hadn’t seen in almost 30 years. In 1983, I was retained by an investment banker...
Check out warning devices for hazardous areas and high-visibility work vests that reduce static electricity.
Stanislaw K. Wasylkiewicz
A tool called azeotrope pressure sensitivity analysis (APSA) can shed light on the dependence of an azeotrope's composition and temperature on changes in pressure.
In 2005, the reported median salary of $92,150 is up 3.9% from last year. Chemical engineering salaries are also slightly ahead of their collective engineering peers, and furthermore, starting-salary offers are at an all-time high of $54,256. This...
Pipes and equipment that are not properly supported will be subject to stress, vibration, or other problems, This can cause leaks, or even a complete collapse of piping or equipment. But, problems with inadequate support of piping and other...
Chemical engineering salaries are up 7% from two years ago, to a median of $110,950. Furthermore, average starting salaries have risen to over $65,000.
Chemical engineering salaries have remained stable over the last two years at a median of $110,000. Average starting salaries are nearly $66,900. This expanded version of the article that appeared in print provides the detailed survey results.
Pavel Ditl, Frantisek Rieger
Impeller and vessel geometries are key factors in selecting mixing equipment to efficiently suspend particulate solids in slurries
Today's CFD Programs are more powerful and easier to use than ever, thanks to improved mesh-generation strategies, computational methodologies, user interfaces and enhanced graphics capabilities. Cover photo courtesy of Acusim and Intelligent Light.
Now Available: High-Performance Carbon Nanotube Fibers; Nanowire-Based Solar Cell Achieves Record Performance; Fireflies Share Their Light Tricks with LEDs; Tissue Adhesives Are Inspired by the Prickly Porcupine; New Coating Shields Against Nearly All Liquids; and more.
Michael Cipullo, Jeffrey Mueller
Use this holistic approach as the basis for a process development strategy to identify environmentally sound, cost-effective, low-waste-generating processes.
K. Eric Bengtson, John W. Carson, Thomas G. Troxel
A sound theoretical model of the process to be scaled is the best approach; if one is not available, bench-scale testing, physical scale modeling or full-scale modeling is required. Here are guidelines as to which method is appropriate for various...
Eliminate unnecessary damage in piping systems by following these guidelines to avoid pulsations from pumps and compressors.
Emil Abkar, Khashayar Afshar, Henry Z. Kister, Jeffrey Scherffius
Generalized pressure-drop correlation (GPDC) charts have been the standard for predicting packing flood points and pressure drops. This article guides engineers on the correct and incorrect uses of the GPDC interpolation procedure, and updates the...
Charles W. Forsberg
The end of the oil age is coming. While the replacements for oil are uncertain, the leading candidates have one thing in common — the need for massive quantities of hydrogen in the production process.
Mitrajit Mukherjee, James Nehlsen, Richard V. Porcelli
To ensure a practical, efficient and economically viable process, first consider how a successful catalytic reaction system would work, then focus on making a catalyst with the desired characteristics.
Next-generation DNA sequencing techniques have both revolutionized the field of genetics and introduced a new set of challenging bioinformatics problems. These new methods carry out a massive number of sequencing operations in parallel and read...
This effective approach to flowmeter selection involves a step-by-step method that begins by matching the application with the flowmeter(s). Then, a series of criteria are applied to narrow the selection.
I like to think of myself as an engineer with an ability to bring various disciplines together to tackle tough challenges,” says Narayan Ramesh, Associate R&D Director at Dow Solar, and recipient of AIChE’s inaugural Industrial Progress Award...
Donald K. Lorenzo
Follow these guidelines to identify situations in which human errors are likely to occur and to correct potential problems early enough to avoid adverse consequences.
Herbert W. Cooper
Chemical engineers will play an important role in the development and deployment of fuel cells. This primer summarizes some of the key technical and economic issues that must be overcome.
Lionel O'Young , Christianto Wibowo
Chromatographic resolution coupled with crystallization can be your best option for manufacturing chirally pure products.
Industry experts share their opinions on what they consider to be important recent breakthroughs and what they predict will be next for the CPI.
New topical conferences devoted to clean energy and chemical manufacturing, a special session about P.E. licensure, and a dual-format poster session will be only some of the opportunities to learn and network at AIChE’s 2013 Spring Meeting and 9th...
Proper installation, maintenance, and inspection of metal tubing is important in preventing fires and toxic material releases in process plants. Do not forget about tubing just because it is usually small. Even a small leak can cause a fire that can...
The right elbow can keep your system operating at peak performance, reduce maintenance costs, and minimize material attrition and elbow wear. This article describes common elbows and outlines factors to consider when selecting one.
Conrad E. Gamble, P.E.
By taking ownership of fluid-related decisions for the entire life of the project, from design through dismantling, users can secure the best and lowest-cost approach in process heating and cooling.
Michael B. Cutlip, Michael Elly, Mordechai Shacham
Understand how to detect and prevent common errors when using mathematical software tools.
Simon X. Xu
Gamma CAT-scan technology makes possible the collection of much more vital online process information than conventional diagnostic techniques.
AIChE's Equipment Testing Procedures Committee
Here's how to evaluate rotary pumps— gear, lobe, vane and multiple-screw designs— regardless of whether the material being handled is a Newtonian or non-Newtonian fluid.
Herbert W. Cooper
Can a mega-worldwide energy interruption occur? The perfect storm may be brewing with such events as natural disasters, acts of terrorism and international disputes. This article explains how your company can prepare to effectively handle an energy...