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Adsorption/Crystallization Para-Xylene Purification ...

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Adsorption/Crystallization Para-Xylene Purification Process

Name:Personal
Ahmed Alkulaif Role :Text(marcrelator)
creator

Name:Personal
Clark Anderson Role :Text(marcrelator)
creator

Name:Personal
Jessica Schlicting Role :Text(marcrelator)
creator

Name:Personal
Henock Shibeshi Role :Text(marcrelator)
creator

Name:Personal
Mahjed Almufadda Role :Text(marcrelator)
creator

typeOfResource
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Powerpoint/PDF
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Laramie, Wyoming
University of Wyoming (keyDate="yes")
4/24/2010

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abstract
Several technologies exist for recovering para-xylene from mixtures also containing its isomers and similar hydrocarbons, including ortho-xylene, meta-xylene and ethylbenzene. Adsorption-based and crystallization-based methods are commonly used in industry. Individually, these two processes can produce 99.6 to 99.8 wt% purity para-xylene very efficiently. However, achieving purities of about 99.9 wt% is difficult and costly. Our group is exploring a hybrid process, which combines adsorption and crystallization, in an effort to efficiently and economically yield the industry requirement of 99.9wt% para-xylene. The overall process includes feeding mixed xylenes and ethylbenzene and supplemental hydrogen to a ‘hot’ section, where isomerization reactions convert non-desirable isomers to para-xylene, and the products are fractionated. Subsequently, the increased fraction of para-xylene is selectively adsorbed in molecular sieves beds. Toluene is then used to desorb and regenerate the adsorbent. The removed para-xylene rich stream is next treated in the crystallization section, which utilizes propane refrigeration to cool and essentially freeze out the 99.9% pure para-xylene product. Apart from capital costs, the major expenses are utilities costs, which are mitigated by heat integration throughout the process. The process appears to be an improvement over conventional technology. note
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Undergraduate Research Day

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Undergraduate Research Day 2010

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http://hdl.handle.net/10176/wyu:702

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http://digital.uwyo.edu/copyright.htm
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eng