Patent Application Titled "Purification Method And Device For Continuous Distillation And Separation Of Ibuprofen Intermediate Raw Material" Published Online (USPTO 20230382828).

The US Patent and Trademark Office has published a patent application from inventors at Qingdao University of Science and Technology in China. The application describes a method and device for purifying ibuprofen intermediate raw materials through a multi-stage distillation process. The method achieves high product recovery rates and purity levels, with the purity of isobutyl benzene reaching 99.99 wt % and the recovery rate reaching 99.9 wt %. The inventors have also developed a device specifically designed for the separation and purification of isobutyl benzene, suitable for industrial and continuous production. [Extracted from the article]