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Archives :: Processing & Handling :: Separation (Liquid-Liquid & Gas-Liquid) :: Distillation

Displaying 1 - 20 of 43 stories.
April 1, 2014
In my October 2011 column (A window into kettle reboiler secrets, Chem. Eng. p. 28) I briefly described FRI’s early work using two windows on its industrial-size kettle reboiler. Subsequent to that, FRI had performed appreciable heat-transfer work. All of that work was reported to FRI’s members at all-day kettle-reboiler symposia, which were held in Galveston, Tex. on October 2 and in Tokyo on...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/A-better-look-into-kettle-reboilers_11625.html
January 1, 2014
FRI’s membership has been growing steadily since 2006. As a result, I have more bosses every year; at present, 78. I receive input from them in several ways. They attend quarterly meetings. They respond to surveys and votes. They send emails. They call. Primarily, this column describes the projects that are presently of the most interest to the membership. In 2013, 8-ft-dia. two-pass valve trays were...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Learning-more-about-distillation_11346.html
December 1, 2013
A plant turnaround is always challenging in the chemical process industries (CPI). But with proper planning and reliable procedures in place, last-minute time crunches and failures can be prevented. When haste combines with faulty methods, costly problems result. This article presents three examples of actual plant turnarounds and the lessons that can be learned from them.   Case study No. 1...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Plant-Revamps-and-Turnarounds-Some-Lessons-Learned_11266.html
November 1, 2013
A recent book by Lieberman [1] stresses that to combat the environmental crisis that our planet is facing, it is essential to make existing units work adequately and efficiently. Equipment that malfunctions or limps along limits production and does not permit good energy and equipment utilization. This, in turn, leads to higher environmental degradation, not to mention plant downtime and lost production...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Troubleshooting-and-Solving-a-Sour-Water-Stripper-Problem_11171.html
September 1, 2013
Many chemical engineers study or employ distillation trays, gas-liquid separators and spray nozzles. Most of those engineers have studied or employed force balances around liquid droplets suspended in upward-flowing vapor streams. Considering a droplet of size “ d, ” for the droplet to be suspended motionless, the summed forces of drag and buoyancy must equal exactly the force of gravity. At...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/The-science-of-droplets_10949.html
May 1, 2013
For separation columns, this multidisciplinary engineering company offers a high-performance random packing called Cascade Mini Ring, which is also available with a...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Column-internals-for-efficient-separations_10481.html
November 1, 2012
The GEA 2H MASSdek structured packings have been used for such applications as gas scrubbing, exhaust-air cleaning, desorption (stripping) and rectification. Compared to conventional packings, the 2H MASSdek packings are...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Structured-packing-for-gas-scrubber-applications_9911.html
October 1, 2012
The patented Plate Molecular Still is capable of distilling large quantities of product (10 ton/h and more), under medium- or high-vacuum conditions. The system is suitable for applications involving...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/An-economical-way-to-distill-large-volumes-of-products_9814.html
September 1, 2012
The patented Plate Molecular Still is capable of distilling large quantities of product (10 ton/h and more), under medium- or high-vacuum conditions. The system is suitable for applications involving...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/An-economical-way-to-distill-large-volumes-of-products_9666.html
June 1, 2012
A variety of performance problems can arise in distillation towers during startup. Many are caused by equipment, hardware or process conditions. Hardware issues may be related to instrumentation, tower internals or ancillaries. Instrumentation malfunctions are also common during startup and are predominantly related to liquid level indicators, online analysis of key components and in some cases...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Distillation-Avoid-Problems-During-Tower-Startup_9389.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.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Distillation-Optimization-By-Vapor-Recompression_9064.html
September 1, 2011
Condensate pots are commonly used on the condensing sides of some reboilers, such as those that are heated by steam or refrigerant vapor. These pots provide a liquid seal that prevents uncondensed vapor from blowing out of the reboiler into the condensate system. A break in this seal can result in heat transfer losses. With steam reboilers, blowing vapor into the condensate header may also lead to...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Reboiler-Condensate-Drums-Silencing-Hydraulic-Hammer_8438.html
July 1, 2011
I have an ongoing dispute with a longtime colleague, Bob Miller. I said he ruined my new safety boots. He said he didn’t. Bob was a young, fearless distillation engineer at a time when our extraction engineer refused to take a trip to Japan to inspect new trays going into an old extractor. I called Bob into my office and asked him to take the trip, even with zero extraction experience. Bob accepted...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/When-troubleshooting-the-extractor_8158.html
July 1, 2011
Distillation columns are often workhorses in the chemical process industries (CPI), and at times, it is necessary to physically inspect the interior of a column. This article demonstrates what an inspection can reveal, by sharing the experience of actual fractionation-tower inspections in a petroleum refinery. The points mentioned are intended to provide guidance to future tower inspectors, so that they...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Inspecting-Fractionation-Towers_8214.html
June 1, 2011
When it comes to distillation trays and packing, chemical processors require the same criteria they seek from all equipment in this tight economy — technology that will reduce energy use and boost throughput without costly facility expansion. In an effort to meet these needs, tray and packing specialists are improving existing technologies and launching a whole new generation of trays designed to...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Column-Internals-The-Next-Big-Thing_8103.html
May 1, 2011
Designed for new or existing separator and distillation tower operations, the Uniflow Inlet Diffuser can correct flow imbalances and improve gas...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Improve-separator-performance-with-this-inlet-diffuser_7905.html
April 1, 2011
It was the Dr. James R. Fair Heritage Distillation Symposium at the Chicago AIChE meeting last month. I had decided to finally give a presentation about something that has been bugging me since October 28, 1974, my first day as a practicing chemical engineer. “Regarding distillation trays, I do not believe in entrainment. I believe that I am at least 50% correct.” I had the audience’s...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/I-do-not-believe-in-entrainment_7730.html
April 1, 2011
Manufacturers of specialty chemicals are routinely required to reduce costs and increase the production of their high-value products. Specifically, competitive pressures from the developing world, increases in raw material costs and volatility in energy costs are putting significant pressure on manufacturers to minimize processing costs and maximize product yields. The economic impact of optimization...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Distillation-Back-Mixing-Impact-on-Batch-Yields_7781.html
March 1, 2011
Considering that Fractionation Research, Inc. (FRI) has been performing distillation research since 1954, don’t we have all the answers yet? Not according to the membership. The vendors of trays and packings have had very aggressive R&D programs. New and interesting products have appeared annually. In addition to the testing of such products in hydrocarbon service and at commercial diameters, the...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/FRIs-parallel-projects_6434.html
January 1, 2011
The reboiler generally supplies most of the energy required to effect component separation. If too much heat is supplied, the tower may flood; conversely, if too little heat is available, separation performance may decrease via poor reflux ratio (pinching), excessive weeping or poor tray action. Proper design of reboiling systems involves coordinating aspects both outside and inside the tower. This article...
http://www.che.com/processing_and_handling/sep_liquid_liquid_and_gas_liquid/distillation/Reboiler-Circuits-For-Trayed-Columns_6291.html
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