Extractive distillation process for benzene recovery
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United States of America Patent
Stats
-
Apr 14, 2015
Grant Date -
Sep 5, 2013
app pub date -
Mar 1, 2012
filing date -
Mar 1, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Recovering high purity benzene from hydrocarbon feedstock containing aromatics and non-aromatics is implemented by simple and low-cost modifications to conventional extractive distillation columns (EDCs). Methyl cyclohexane (MCH) that is generated through non-selective hydrogenation of toluene in hydrodesulfurization (HDS) units is a major contaminant in benzene production. To meet MCH specifications, often times the extractive distillation (ED) process for recovering purified benzene is operated with excessive benzene loss to the overhead raffinate stream, producing a lower quality non-aromatic product. Novel techniques (1) remove operational constrictions of the HDS unit on MCH production, thus lengthening the catalyst life and (2) allow the EDC to drive essentially any amount of MCH away from the bottom benzene product without concerns with benzene loss to the overhead raffinate stream and (3) recover benzene from the overhead raffinate stream to upgrade the quality of non-aromatic product and increase the benzene product recovery.
First Claim
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International Classification(s)
- 2012 Application Filing Year
- C07C Class
- 3137 Applications Filed
- 2508 Patents Issued To-Date
- 79.95 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 1 Citation Count
- C07C Class
- 34.61 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Oct 14, 2026 |
