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Basics of Leaching

Nov 08 2010 01:30 PM | Chris Haslego in Separation Technology

Simply put, leaching generally refers to the removal of a substance from a solid via a liquid extraction media.  The desired component diffuses into the solvent from its natural solid form.  Examples of leaching include the removal of sugar from suga...

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Pyrophoric Iron Fires

Nov 08 2010 01:30 PM | Mukesh Sahdev in Safety and Pressure Relief

At one time or another, most refineries experience spontaneous ignition of iron sulfide either on the ground or inside equipment. When this occurs inside equipment like columns, vessels, and tanks and exchangers containing residual hydrocarbons and air...

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Solving Integral Equations in MS Excel

Nov 08 2010 01:10 PM | Steve Hall in Calculations and Tips

TankVolume, as it appears in the online store, calculates the liquid volume of partially filled tanks, horizontal or vertical, with various types of heads.  One of these, the torispherical head, requires that integral equations be solved.  This artic...

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Basics of Injection Molding

Nov 08 2010 01:30 PM | Chris Haslego in Bulk Solids

Making polymers is a fantastic science.   Then there is the matter of shaping the plastic into useful objects....another fantastic science.  One of the most common methods of shaping plastic resins is a process called injection molding.  Injection m...

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Terms of Use and Legal Restrictions

Feb 17 2011 11:50 PM | Chris Haslego in Articles

ATTENTION: PLEASE READ THESE TERMS CAREFULLY BEFORE USING THIS WEB SITE. USING THIS WEB SITE INDICATES THAT YOU ACCEPT THESE TERMS. IF YOU DO NOT ACCEPT THESE TERMS ("TERMS"), DO NOT USE THIS WEB SITE. Use of Site. The Chemical Engineers' Resource Pa...

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Rupture Disks for Process Engineers - Part 6

Nov 08 2010 01:30 PM | pleckner in Safety and Pressure Relief

Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. Part 2 discussed how to size the rupture disk. Part 3 discussed how to set the burst pressure. Part 4 discussed...

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Rupture Disks for Process Engineers - Part 5

Nov 08 2010 01:30 PM | pleckner in Safety and Pressure Relief

Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. Part 2 discussed how to size the rupture disk. Part 3 discussed how to set the burst pressure. Part 4 discussed...

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Rupture Disks for Process Engineers - Part 4

Nov 08 2010 01:30 PM | pleckner in Safety and Pressure Relief

Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. Part 2 discussed how to size the rupture disk. Part 3 discussed how to set the burst pressure. In this part, I w...

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Rupture Disks for Process Engineers - Part 3

Nov 08 2010 01:30 PM | pleckner in Safety and Pressure Relief

Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. Part 2 discussed how to size the rupture disk. In this part, I will cover how to set the burst pressure. Subsequ...

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Rupture Disks for Process Engineers - Part 2

Nov 08 2010 01:30 PM | pleckner in Safety and Pressure Relief

Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. This part will discuss how to size the rupture disk. Subsequent parts will include how to set the burst pressure...

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Rupture Disks for Process Engineers - Part 1

Nov 08 2010 01:30 PM | pleckner in Safety and Pressure Relief

This is a real story. A rupture disk manufacturer presented a seminar to a group consisting of junior and more senior level process design engineers (yours truly included) with a few instrument engineers thrown in. After about an hour of hearing terms...

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Relief Valves: "What Can Go Wrong" Scen...

Nov 08 2010 01:30 PM | pleckner in Safety and Pressure Relief

What can go wrong in a chemical facility? Plenty! A report in the August 2000 issue of CEP1 shows that operator error or poor maintenance was the leading of cause of accidents for unfired pressure vessels eight years running. The ProblemAccidents not o...

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ChE Plus Has Moved

Dec 29 2010 10:10 PM | Chris Haslego in Articles

ChE Plus has moved to the Community section of our website. Here, we'll explain how to access your ChE Plus files in our new interface. If you do NOT have an account set up in our community section, read below about how to gain access.Already Have a...

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Mail List Subscribers: Join Our Community

Dec 30 2010 11:20 PM | Chris Haslego in Articles

I'd like to welcome our mail list subscribers to our improved community. For years, visitors to the site had a chance to quickly fill out a brief form at the bottom of every page on the site to let us know that they wanted to be updated when new conte...

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Sizing of Packed Towers in Acid Plants

Dec 13 2010 10:20 AM | Guest in Separation Technology

Packed towers are key components in sulfuric acid plants. Drying of the sulfur furnace air is necessary to avoid acid condensation and corrosion in downstream equipment and to minimize mist formation. Absorption of SO3 in the Interpass and Final Towers...

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Trickling Biofilters for Hydrogen Sulfide Odor...

Dec 13 2010 01:36 PM | mwu in Separation Technology

Controlling hydrogen sulfide and other odor emissions is a major issue for most wastewater treatment plants. H2S odors can by reduced to very low levels by wet scrubbers using caustic and chlorine or sodium hypochlorite. However, the chemical storage,...

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Distillation Pilot Plant Design, Operating Para...

Dec 13 2010 11:53 AM | Chris Haslego in Separation Technology

In spite of the fact that tremendous progress is being made in understanding the performance of both random and structured packings in distillation, it is a long way from being able to predict from first principles, the efficiency, capacity and pressur...

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Energy Conservation in Distillation

Dec 13 2010 09:23 AM | Chris Haslego in Separation Technology

The preferred method of separation in the chemical industry, distillation, is a very energy intensive process. Fine tuning your distillation columns (and in some cases, making major changes) can save your company thousands of dollars a year or more. Co...

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