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A comparative study of physical and chemical methods for the separation of benzoic acid from industrial waste stream

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dc.contributor.author Khan, Rehan
dc.date.accessioned 2021-02-17T10:25:28Z
dc.date.available 2021-02-17T10:25:28Z
dc.date.issued 2016
dc.identifier.uri http://10.250.8.41:8080/xmlui/handle/123456789/22496
dc.description Dr. Tayyaba Noor en_US
dc.description.abstract Phthalic anhydride is manufactured by the partial oxidation of ortho xylene in the presence of V205/TiO2 catalyst. In the residue, maleic acid, benzoic acid (BA), toluic acid and traces of other organic compounds are present in the byproduct stream. The waste stream is in the form of slurry at high temperature and is solidified at room temperature. Benzoic acid was selectively removed from the solid waste of phthalic anhydride production industry. In the present work, the separation of benzoic acid from crude sample has been performed by using physical and chemical techniques. In physical methods re-crystallization (RE), liquid-liquid extraction (LLE) as well as re-crystallization followed by liquid-liquid extraction (RE, LLE) and liquid-liquid extraction followed by re-crystallization (LLE, RE) have been studied. In another attempt chemical derivatization (CD) has been performed for the purification purposes. The operation has been carried out at the atmospheric pressure with operating temperatures of 100⁰C and 25⁰C in physical processes (RE) and (LLE) respectively while in chemical derivatization it ranges from 72⁰C to 100⁰C. The characterization of the samples was accomplished by melting point determination, Gas chromatography (GC), Mass spectrometry (MS) and Fourier transform infrared spectroscopy (FTIR) . RE technique gives high recovery with compromised purity.CD is found to be generating high purity but with only 58% recovery. While LLE is associated with optimized purity and recovery. Almost 99% of the purity was achieved by CD , LLE , RE followed LLE and LLE followed by RE. en_US
dc.publisher SCME,NUST en_US
dc.subject comparative study, physical , chemical methods, separation, benzoic acid, industrial ,waste stream en_US
dc.title A comparative study of physical and chemical methods for the separation of benzoic acid from industrial waste stream en_US
dc.type Thesis en_US


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