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AIChE Spring Meeting and Global Congress on Process Safety

Ethylene Plant Optimization: Footprint Replacements & Parallel Compressor Trains

Apr 2, 2012
Keizo Yonedi
There are many important benefits of revamping, rerating and modernizing turbomachinery such as accommodating changes in current operating conditions, improving operating efficiency, and removing process bottlenecks. This paper will focus on the capacity gains realized through equipment replacement...

Acceptable Operating Parameters for Steam Assisted Flares At Purge Rates

Apr 2, 2012
Tom Farmer
Recent field observations by TCEQ have revealed what appears to be poor flare destruction efficiency by some steam and air assisted flares when operating at turndown condition. Using specialized infrared cameras, unburned hydrocarbons were detected coming from improperly operated flare systems...

All Sulphur Plants Are Not Created Equal

Apr 2, 2012
Angela Slavens
All Sulphur Plants are Not Created Equal ABSTRACT Sulphur recovery from natural resources is required to meet environmental regulations on sulphur content in final products, as well as SO x emissions restrictions imposed on processing facilities. While sulphur recovery facilities in oil refineries...

Waste Heat Recovery Considerations in LNG Plants

Apr 2, 2012
Douglas Wiles
WASTE HEAT RECOVERY CONSIDERATIONS IN LNG PLANTS ABSTRACT DOUGLAS WILES, RYAN HOLLENBACH & STANLEY KWAN Thermal integration in an LNG plant improves its overall thermal efficiency. Thermally integrated plants tend to have lower operating costs and reduced environmental emissions including, CO,...

Installing a Charge Gas Compressor Booster

Apr 2, 2012
Giorgio Franceschetti
The Braskem Ethylene Southeast Plant expansion study from 500 MTA to 700 MTA recommended that the charge gas compressor turbine and the 1 st and 2 nd stages should be replaced. Due to a series of technical and logistical constraints, was decided to install a booster compressor upstream the first...

Re-Rating Ethylene Plant Equipment for Optimum Results

Apr 2, 2012
Daniel Renard
Rerating of turbomachinery equipment installed in ethylene plants is a well established method of improving plant operation, whether it is capacity changes, feedstock flexibility, power reduction or combination of all three. By utilizing modern compressor and steam turbine component technology,...

Tutorial: The Chemistry of Refinery Fouling

Apr 2, 2012
Irv Wiehe
The chemistry of refinery fouling is well enough understood to mitigate nearly all fouling. The key information required are the location of the foulant, elemental analysis of the foulant, and identification of precursors in the oil flowing through the fouled unit. Most organic fouling is caused by...

Useful Tips for Optimal Fired Heater Performance

Apr 2, 2012
Nikki Bishop
Advanced Process Control Strategies for Process Fired Heaters Fired Heaters are used extensively throughout refineries for heating, vaporization and thermal cracking of various process fluids. These heaters are essential for refinery operation. The main objectives for fired heater optimization are...

The Economics of Process Measurements

Apr 2, 2012
Douglas C. White
What is the economic value of a new measuring device in a process plant – a new analyzer, a more accurate flow measurement, an additional temperature or pressure measurement, etc.? Excluding the minimum set of measurements required to safely operate the plant and meet regulatory requirements, how...

Fate of Ammonia in Refinery Amine Systems

Apr 2, 2012
Nathan A. Hatcher
Fate of Ammonia in Refinery Amine Systems Ralph H. Weiland, Nathan A. Hatcher & R. Scott Alvis Optimized Gas Treating, Inc. Sugar Land, TX ABSTRACT Ammonia ingress and accumulation in refinery and bio-gas amine systems is not a new problem. However, increasing utilization of advantaged crudes...

Industrial Experience in Handling Cleaning of Crude Refinery Preheat Trains

Apr 2, 2012
Simon J. Pugh
Industrial Experience in Handling Cleaning of Crude Refinery Preheat Trains 1,2 Ishiyama E.M., 1 Pugh S.J. and 2 Wilson D.I. 1 IHS ESDU, Houndsditch, London EC3A 7BX, UK 2 Department of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Cambridge CB2 3RA, UK Abstract...

Combustion of Mixtures: A Modified IFC Approach

Apr 2, 2012
Gary Mueller
While most studies on flares have been done with single hydrocarbon fuels or binary mixtures, the reality of most industrial flares is that they see different mixtures of many gases. Over the past 5 years the International Flare Consortium (IFC) has been conducting research on just this issue. In a...

Loss of Downcomer Seal on a Depropanizer During a Plant Start up

Mar 16, 2011
Andre Bernard
The bottom C4’s product specification could not be met on the Depropanizer tower during a plant start up. The olefins unit had been started with a new start up procedure, which involved significant reduction in feed rates to the unit until achieving on spec ethylene. C3 & C4’s product were to...

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