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Displaying 1 - 20 of 27 stories.
December 1, 2013
Capital cost calculations I recently read the article “Capital Costs Quickly Calculated” [ Chem. Eng., pp.46­–52, April 2009] and find it extremely informative and useful. I have reservations about the example given about the cost comparison of two spherical storage tanks. The authors state that the costs of spherical storage tanks are proportional to surface area, therefore, to the...
http://www.chemengonline.com/extras/ps_and_corrections/Capital-cost-calculations-Postscripts-corrections_11258.html
October 1, 2012
Correction: From the October 2012 Letters page: Who's Who that ran in the print edition of Chemical Engineering had two spelling errors: Blachoh Fluid Control is correctly spelled Blacoh Fluid Control, and the headquarters of CST International is Lenexa, Kan. (not Lexana). . Thill Peeters Rosenberger Pace Lind   SNC-Lavalin (Montreal, Quebec), a global engineering and construction group that...
http://www.chemengonline.com/extras/ps_and_corrections/Robert-Card-becomes-president-and-CEO-of-SNC-Lavalin-_9781.html
September 1, 2012
Corrections: From the October 2012 Letters page: This original article, which appeared in the print edition of Chemical Engineering (September 2012), had two errors: Equation (19) should read D = log (TH)-0.4, and Table 2 was missing decimal points in all numbers on both the x- and y-axes. The corrections are shown here. Recirculating cooling-water systems are essential parts of many facilities throughout...
http://www.chemengonline.com/extras/ps_and_corrections/Cooling-Water-Outlet-Temperature-Evaluating-The-Best-Maximum-Value_9683.html
July 1, 2012
There might be as many categories of catalysts as there are chemical processing applications. And, no matter what the specialty or application, most catalyst producers are in a constant state of research and development in order to meet the demands of their chemical processing customers, as well as to develop innovative catalysts for new applications and growing market areas. Recent efforts of some of the...
http://www.chemengonline.com/extras/ps_and_corrections/Development-Speeds-up-In-Catalysis_9441.html
June 1, 2012
Throughout the chemical process industries (CPI), the need to drain a tank or process vessel arises. In batch-type plants, it is a regular occurrence and is one factor that affects the total cycle time per batch and ultimately the entire production capacity of the plant itself.  Figure 1. In a vertical cylindrical, flat-bottom tank, liquid is flowing into the outlet nozzle (point 1) located at x...
http://www.chemengonline.com/extras/ps_and_corrections/Draining-Vessels_9398.html
May 1, 2012
A new catalyst that converts H2 and CO2 into formic acid under mild conditions has been developed by researchers at the Solar Light Energy Conversion Group of Energy Technology Research Institute, National Institute for Advanced Industrial Science and Technology (AIST; Tsukuba, Japan; unit.aist.go.jp/energy/index_e.htm) and Brookhaven National Laboratory (BNL; Upton, N.Y.; www.bnl.gov). And because the...
http://www.chemengonline.com/extras/ps_and_corrections/A-new-catalyst-enables-room-temperature-interconversion-of-CO2-and-formic-acid_9308.html
March 1, 2012
Distillation is one of the most extensively used operations in the chemical process industries (CPI). It is a highly energy-intensive unit operation, and continuously rising energy costs make it imperative to look for ways to reduce energy requirements. Some energy-saving configurations can increase capital investment costs, so the benefits need to be weighed carefully. Various techniques, such as heat...
http://www.chemengonline.com/extras/ps_and_corrections/Distillation-Optimization-By-Vapor-Recompression_9064.html
February 1, 2012
Various misconceptions arise when it comes to the thermal design of cooling towers. Sometimes related parameters, such as range, approach, effectiveness, liquid-to-gas ratio ( L/G), wet-bulb temperature, cooling water temperature, relative humidity, number of transfer units (NTU) and other terms create a confusion for the designer in effectively sizing, selecting and evaluating a particular cooling tower...
http://www.chemengonline.com/extras/ps_and_corrections/Effective-Thermal-Design-Of-Cooling-Towers_8949.html
January 1, 2012
Construction of a demonstration plant has begun for a biomass-to-gasoline process that boosts biomass conversion efficiency in producing bio-gasoline. The demonstration, to be located at the Hillsborough, N.J. headquarters of Primus Green Energy (www.primusge.com), is slated for completion in the middle of 2012. Primus recently announced the successful pilot-scale operation of its gasification and...
http://www.chemengonline.com/extras/ps_and_corrections/Demo-plant-for-high-yield-biomass-to-gasoline-process-under-construction_8824.html
January 1, 2012
In professional life, the influences that teach us, inspire us and drive us to succeed tend to come more from individuals than corporations. If you would like to bring recognition to someone whose excellence in chemical engineering you admire, consider nominating him or her for Chemical Engineering’s 2012 Personal Achievement Award. The nomination period is now open. The aim of this award, which...
http://www.chemengonline.com/extras/ps_and_corrections/Personal-Achievement-Award-Opens_8830.html
December 1, 2011
  Because the benefits are many, roles for simulation software tools exist from planning and design of facilities through operations and everything in between. And thanks to enhancements, it’s becoming easier to use simulation alongside other software packages, while niche simulation tools are making complex processes easier and less expensive to implement. In general, process simulation...
http://www.chemengonline.com/extras/ps_and_corrections/Simulation-Spreads-its-wings_8759.html
September 1, 2011
This article presents equations that allow the user to calculate liquid volume as a function of liquid depth, in both vertically and horizontally oriented tanks with dished heads. The equations accommodate all tank heads that can be described by two radii of curvature (torispherical heads). Examples include: ASME flanged & dished (F&D) heads, ASME 80/10 F&D heads, ASME 80/6 F&D heads...
http://www.chemengonline.com/extras/ps_and_corrections/Calculate-Liquid-Volumes-in-Tanks-with-Dished-Heads_8471.html
August 1, 2011
Modern industrial-automation systems rely entirely on digital technology, that is, computers. And as is typical of digital products, suppliers love to add features — data collection, alarm management, and so on — that are very useful for process operations but are not process control in the purest sense. This is continuing, the result being that process control systems are evolving to...
http://www.chemengonline.com/extras/ps_and_corrections/Todays-Process-Automation-Worlds_8302.html
June 1, 2011
Scaleup is set for two technologies that facilitate the capture of carbon dioxide from fluegas by substituting oxygen for combustion air. Oxycombustion, as it is called, results in a much smaller fluegas stream, containing up to 90% CO2; part of that is recycled to dilute the O2 and control the combustion temperature. The O2 is entrained in the CO2 stream for injection into the furnace. The companies...
http://www.chemengonline.com/extras/ps_and_corrections/CO2-capture-technologies-move-ahead_8085.html
May 1, 2011
Due to their simplicity of construction, lack of moving parts, ability to operate at a wide range of temperatures and pressures, low capital and operating cost, cyclones have been the workhorse for gas-solid separation in a wide variety of industries. If properly designed and installed, cyclones can be used to control particulate emissions as low as 5 microns in size, and sometimes to smaller sizes in...
http://www.chemengonline.com/extras/ps_and_corrections/Harnessing-the-Power-of-a-Cyclone_7990.html
April 1, 2011
Traditionally, most students have learned about chemical reactions in laboratories using test tubes, beakers and flasks. Those who have gone on to discover and develop new products have typically done so using these batchwise techniques. This mind-set has continued through the piloting and scaleup phase, so that today, many chemical products are produced batchwise in large, continuously stirred reactors...
http://www.chemengonline.com/extras/ps_and_corrections/Shedding-Light-on-Microreactors_7844.html
March 1, 2011
This book examines global patent law as it affects the chemical, biological and pharmaceutical industries. Rather than taking a legal case-study approach, it provides a practical discussion of everyday issues and decisions faced by global patent practitioners in these complex industry segments. Focusing mainly on the patent systems in the U.S., U.K. and Japan, the five-section book effectively summarizes...
http://www.chemengonline.com/extras/ps_and_corrections/Chemical-patents-book-reviewed-by-attorney-Daniel-Miller_6421.html
March 1, 2011
Agility, reliability, reporting and sharing of business information are among the key ingredients that have been dictated to modern-day control systems by the competitive pressures facing today’s manufacturers. In short, production must be faster, more efficient and provide actionable data for operators. And the last thing anybody in this situation needs is a server failure. Where does that leave the...
http://www.chemengonline.com/extras/ps_and_corrections/Solving-Common-Batch-Problems-Controller-Based-Systems_6446.html
February 1, 2011
Current industry syngas output has increased by 26% since 2007 — and by 50% since 2004 — reaching a current gasification capacity of 70,817 MWth of syngas output, according to the U.S. Dept. of Energy’s (DOE; Washington, D.C.; www.energy.gov) 2010 Worldwide Gasification Database. With 48 new plants (93 gasifiers) planned or under construction in the period 2011–2016, the global...
http://www.chemengonline.com/extras/ps_and_corrections/Coal-to-Chemicals_6368.html
January 1, 2011
Although plant safety should be a top priority every day, there are certain times when extra vigilance is needed to make sure that safety practices are being maintained. This article outlines three periods deemed to be “critical” for plant safety and specific items to pay attention to in these periods.     Three critical periods The following three phases in a production plant’s...
http://www.chemengonline.com/extras/ps_and_corrections/Effective-Plant-Safety-Management_6289.html
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