Issue with the freezing point of benzene not meeting standards

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This post was last edited by Green Lotus on 2018-11-17 at 10:33. Could some expert help me provide a detailed analysis of the reasons behind these issues? The reasons for the unsatisfactory boiling point of benzene include the following: 1) Insufficient depth of the reforming reaction, with too many naphthenes in the feed material； 2) The extracted oil contains a high amount of light non-aromatic hydrocarbons ； 3) Low initial boiling point or water content upon benzene reflux ； 4) The temperature at the bottom of the tower is too high, resulting in an excessive level of toluene in the benzene product ； 5) The temperature difference range control is not appropriate ； 6) Low reflux flow at the tower top or pump failure, resulting in cessation of reflux ； 7) Improper modification of the loop operation, wire cross-contamination ； 8) Instrument control failure ； 9) Analysis error.