2020 REFINING PROCESSES HANDBOOK PROCESS CATEGORIES COMPANY INDEX LUBRICANTS AND WAXES Furfural refining Raffinate flasher stripper Extraction tower Application: A process to produce lube oil raffinates of high-viscosity index from vacuum distillates and de-asphalted oil. Raffinate mix buffer Description: This liquid-liquid extraction process uses furfural as the selective solvent for removing aromatics and other impurities present in distillates and de-asphalted oils. Furfural has a high solvent power for components that are unstable to oxygen, as well as for other undesirable materials including color bodies, resins, carbon-forming constituents and sulfur compounds. In the extraction tower, the feed oil is introduced at the lower part of the extractor at a predetermined temperature. The raffinate phase leaves at the top of the tower and the extract, which contains the bulk of the furfural, is withdrawn from the bottom. The extract phase is then cooled and a socalled "pseudo raffinate" may be sent back to the extraction tower. Multi-stage solvent recovery systems for raffinate and extract solutions secure energy efficient operation. Raffinate STM Extract flasher stripper Extract flash system Extract mix settler STM Extract Feeds: Vacuum distillate lube cuts and de-asphalted oils. Products: Lube oil raffinates of high-viscosity indices. The raffinates contain all of the desirable lubricating oil components present in the feedstock. The extract contains a concentrate of aromatics that may be utilized as rubber oil or cracker feed. Utilities: (Typical, Middle East crude; units per m³ of feed) Electricity 20 kWh MP steam 10 kg LP steam 100 kg Cooling water 30 m³ Fuel energy 20 kWh Installations: Numerous installations under thyssenkrupp license are in operation around the world. STM Solvent drying system Water stripper STM STM Decanter Feed Feed deaerator Furfural stripper buffer Sewer Licensor: thyssenkrupp. The former proprietor of this technology was ThyssenKrupp Uhde GmbH. Website: www.thyssenkrupp-industrial-solutions.com Contacts: sandra.jensen@thyssenkrupp.com, dorothe.weimer@thyssenkrupp.com Copyright © 2020 Gulf Energy Information. All rights reserved.http://www.hydrocarbonprocessing.com/ http://www.thyssenkrupp-industrial-solutions.com