Crude benzene hydrofining method

Abstract

The invention discloses a crude benzene hydrofining method, and belongs to the application field of crude benzene deep processing. The method sequentially comprises the following steps of: A, crude benzene pretreatment; B, crude benzene hydrogenation; C, pre-rectification; and D, rectification for obtaining pure benzene. The pure benzene obtained in the step D can be used for preparing cyclohexane by hydrogenation, and the cyclohexane is prepared into crude alcoholic ketone by oxidization and decomposition reaction. The method optimizes the crude benzene refining flow and the hydrogenation process parameters; the method is particularly suitable for the condition that the product obtained after the crude benzene hydrofining is used as a raw material for producing the cyclohexane; by implementing the method, the yield of the crude benzene hydrofining product is improved by over 4 percent, and the energy is saved by over 32 percent; and the pure benzene produced by crude benzene hydrogenation fully meet the preparation requirement of cyclohexanone.

Description

technical field [0001] The invention relates to a crude benzene deep processing technology, in particular to a crude benzene hydrogenation refining method. Background technique [0002] Crude benzene is a light distillate oil recovered from coal coking crude gas. Its main components are benzene, toluene, and xylene, and it also contains a small amount of non-aromatic components. [0003] At present, for the utilization of crude benzene, the main methods are: [0004] 1. Using the principle of distillation, it is proposed that substances with a boiling point above xylene be subjected to hydrogenation pretreatment; [0005] 2. Under the action of temperature 190-220℃, pressure 2.5MPa, and Ni-Mo catalyst, unsaturated compounds are converted into saturated compounds; [0006] Under the action of a temperature of 190-220°C, a pressure of 2.5MPa, and a Co-Mo catalyst, desulfurization, denitrogenation and olefin saturation reactions of raw materials occur; [0007] 3. Adopt adva...

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Problems solved by technology

[0015] In the current process, the process flow is long and there are many equipments, resulting in high energy consumption and low production efficiency;

[0016] At the same time, certain side reactions will occur during the hydrogenation process. The benzene and toluene in the raw oil will undergo a hydrogenation reaction under a certain temperature, pressure, and hydrogen partial pressure to generate cyclohexane and methylcyclohexane. Imported BASF catalysts are used 1.5% of side reactions will occur; when domestic catalysts are used, 2%-3% of side reactions will occur. In order to remove this part of by-products, 1%-2% of pure benzene will be lost, resulting in low yield

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