Aromatics Unit Revamp Kenning Engineering Dr. Leon Fan PhD. Seymour TX 76380 USA (940) 888-1955 www.kenningglobal.com

Reduce Energy Consumption Aim & Guidelines Reduce Energy Consumption Minimize field work Internals only No change to vessel

Units Revamped Aromatics Extraction Unit PX Separation Unit

Aromatics Extraction Process Flowsheet NA reflux to Extractor Condensing water to Na wash column Aromatics (benzene, toluene) to benzene column Raffinate oil after sulfolane removal Sulfolane Washing water NA Raffinate oil Extractor Feed Water Rich Liquid Rich Liquid Solvent to Extractor Extractor NA Wash Column Stripper Solvent Recovery Column NA=Non Aromatics

Revamp of Aromatics Extraction Unit Aromatics Extractor

Tower Layout (before revamp)

Tower Layout (after revamp)

Strategy Design pipe distributor for Heavy Phase Design pipe distributor for Light Phase Remove column top baffle Increase number of trays Redesign Extractor trace

Heavy Phase Distributor (before revamp)

Heavy Phase Distributor (after revamp)

Light Phase Distributor Fresh solvent feed (before revamp)

Light Phase Distributor (after revamp)

Insert Extra Tray Extra tray Space around feed nozzle before revamp Space around feed nozzle after revamp

Column Top Baffle Removed

Existing Extractor Tray Layout

Tray Modification Tray thickness changed Up-comer height modified Open area adjusted

Performance Improvement after Revamp (Extractor (14-C-011) Operating conditions Units Before Target After Top Pressure Mpa(g) 0.157 Top temperature ⁰C 88 86 Bottom temperature 65 61 Feed rate t/h 30.4 38 37.5 Solvent ratio 3.2 2.6 2.3 NA reflux Rate 11.5 10.6

Quality and Calibration data of Intermediate product (From Zhenhai, Sinopec Group, China in 2007) Name Unit Design value(Protocol value) Calibration value 27日8:00 28日8:00 29日8:00 Purity of Extracted Aromatics wt% ≮99.85 99.86 99.83 99.84 Content of Sulfolane in Extracted Aromatics mg/kg ≯1 ＜1 1 Purity of NA ≮99 99.85 99.92 99.95

Design and Calibration data for yield of Benzene、Tolune and recovery rate of Aromatics (From Zhenhai, Sinopec Group, China in 2007) Name Unit Design value Protocol value Calibration value 11月27日 11月28日 11月29日 Average value Recovery rate of Benzene wt% 99.9 99.5 100.00 Recovery rate of Tolune 99.97 99.98 Yield of Benzene and Tolune To Extractor Feed 66.81 58.05 58.68 58.09 58.27

Conclusion Target for energy consumption achieved No changes to any vessel Field work objectives reached