Employ NMP Extraction for Value Addition of Waxy Streams
IR@IIP: CSIR-Indian Institute of Petroleum, Dehradun
View Archive Info| Field | Value | |
| Creator |
Kaushik,R.S
Srivastava,Manoj Manoj,Kumar Mandal,Susanta Garg,M.O |
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| Date |
2009-06-23T10:35:21Z
2009-06-23T10:35:21Z 2009-06-23T10:35:21Z |
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| Identifier |
http://hdl.handle.net/123456789/254
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| Description |
With rising crude oil prices, coupled with tightening product
specifications and environmental concerns, the refining industry will continue
to see many changes during the times to come. In order to maintain/improve
their margins, refiners are obliged to upgrade the low value streams into more
profitable products. For upgrading the existing product slate, or manufacture of
new products, huge investments are needed for new facilities. This involves logistic
and proper evaluation of all the possible upgrading technologies and optimal
processing schemes in order to arrive at the best option for a particular unit.
This study deals with NMP extraction studies on two vacuum cuts; namely,
pressible and heavy waxy distillates (PWD and HWD) for their up-gradation
into raffinates of desired hydrocarbon composition and extracts of high
aromaticity (BMCI). Solvent extraction studies were carried out on multistage
extraction column in countercurrent mode. The water content in the solvent was
optimized and kept the same for both the streams for ease of solvent recovery.
The extraction conditions such as temperature, solvent-to-feed ratio, and water
content in solvent were optimized for high quality raffinate and high quality
aromatic extract (BMCI >105).
Studies reveal that the processing of PWD and HWD produces raffinate that
could be used as feedstocks to solvent dewaxing/de-oiling unit for paraffin wax
production. The high BMCI extract can be used as feed for high value industrial
carbons such as pitches and needle coke. An added advantage of following
this scheme is that the filtration rates of the NMP extracted PWD and HWD
raffinates increase by ∼50% in comparison to that of raw distillates, thereby
leading to capacity enhancement besides easy finishing of the wax. Moreover,
withdrawal of about 25% of aromatic extracts from PWD and HWD feed stocks
would lead to increase in capacity of the wax dewaxing/deoiling unit.
Keywords: Aromatic extract; Raffinate; Solvent extraction.
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| Language |
en_US
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| Subject |
Aromatic extract
Raffinate Solvent Extraction |
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| Title |
Employ NMP Extraction for Value Addition of Waxy Streams
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| Type |
Article
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