| Phenol and acetone are basic organic chemical products and widely used in engineering plastics, resins, coating, dye, medicine, pesticide and other fields. More than60%of phenol is used for phenolic resin and bisphenol A. α-methylstyrene (AMS) is formed as a byproduct in the process of producing phenol and acetone. AMS is easy to aggregate into dimers and difficult to remove which reduces the content of phenol.Gaoqiao Petrochemical Company’s2#phenol/acetone unit is completed and put into operation in June1997, whose production capacity reached45000tons/year. In July2000, with the first technical innovation of the device, the capacity increased to60000tons/year, at the same time, raw materials consumption, utility products and waste water emissions had significantly reduced. In February2009,2#phenol project is mainly focused on technical renovation of oxidation, concentration, decomposition, extraction, purification and DCS system. The capacity of the device is expanded and energy consumption is greatly reduced. The economic and technical indexes reach the advanced level of the similar equipments. The transformation is completed in December. Gradually the problems are exposed, which mainly include that the phenol content of the crude phenol tata kettle does not meet the standard and the content of AMS dimer is higher.According to the above problems, the gas chromatography-mass spectrometry, gas chromatography, iodine titration, acid-base indicator are used to analyze acetone tower feed, material from crude acetone tower and material from crude phenol tower. According to the formation mechanism of impurities in phenol production and results of the analysis, find the problems existing in the process, optimize the decomposition simulation experiment.The effect of reaction temperature on the secondary decomposition was investigated.The optimum reaction conditions were determined to reduce the content of AMS dimer and increase the phenol content. |
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