Crude benzene hydrofining method

A technology for hydrorefining and crude benzene, applied in chemical instruments and methods, hydrocarbons, organic chemistry, etc., can solve the problems of long process flow, low production efficiency, high energy consumption, etc., to simplify the refining process and reduce costs. , the effect of improving product yield

Inactive Publication Date: 2011-02-09
NEIJIANG TIANKE CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 t

Method used

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  • Crude benzene hydrofining method
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  • Crude benzene hydrofining method

Examples

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Example Embodiment

[0041] Example 1

[0042] A crude benzene hydrorefining method. The raw material of this embodiment is 1 ton of crude benzene, and its component mass percentage content is benzene: 80.57% toluene: 12.49% xylene: 2.24% light component: 0.66% heavy component: 4.04%, including the following steps in sequence:

[0043] A. Crude benzene pretreatment: Coking crude benzene enters the tower for distillation and separation from the middle of the pretreatment tower. The operating tower top pressure is normal pressure, the top temperature is 80°C, and the bottom temperature is 165°C to remove heavy aromatics;

[0044] B. Crude benzene hydrogenation and stabilization part: the material after step A has a hydrogen-to-oil ratio of 400:1 and a volumetric space velocity of 0.5h -1 , The temperature is 195℃, the pressure is 2.0MPa, and the Ni-Mo catalyst is used to convert unsaturated compounds into saturated compounds; at the hydrogen-oil ratio of 400:1, the volumetric space velocity is 0.5h -1 , Te...

Example Embodiment

[0055] Example 2

[0056] A method for preparing cyclohexanone by hydrogenation of crude benzene. The raw material in this example is 1.2 tons of crude benzene, and its component mass percentage content is benzene: 80.57% toluene: 12.49% xylene: 2.24% light component: 0.66 % Weight component: 4.04%, including the following steps in turn:

[0057] A. Crude benzene pretreatment: Coking crude benzene enters the tower for distillation and separation from the middle of the pretreatment tower. The operating tower top pressure is normal pressure, the tower top temperature is 95°C, and the tower bottom temperature is 195°C to remove heavy aromatics;

[0058] B. Crude benzene hydrogenation and stabilization part: the material after step A has a hydrogen-to-oil ratio of 800:1 and a volumetric space velocity of 1.50h -1 , The temperature is 220℃, the pressure is 3.0MPa, and the Ni-Mo catalyst converts unsaturated compounds into saturated compounds; at the hydrogen-oil ratio 800:1, the volumetri...

Example Embodiment

[0069] Example 3

[0070] A method for preparing cyclohexanone by hydrogenation of crude benzene. The raw material in this example is 1.5 tons of crude benzene, and its component mass percentage content is benzene: 80.57% toluene: 12.49% xylene: 2.24% light component: 0.66 % Weight component: 4.04%, including the following steps in sequence:

[0071] A. Crude benzene pretreatment: Coking crude benzene enters the tower for distillation and separation from the middle of the pretreatment tower. The operating tower top pressure is normal pressure, the tower top temperature is 95°C, and the tower bottom temperature is 175°C to remove heavy aromatics;

[0072] B. Crude benzene hydrogenation and stabilization part: the material after step A has a hydrogen-to-oil ratio of 600:1 and a volumetric space velocity of 0.90h -1 , The temperature is 200℃, the pressure is 2.5MPa, and the Ni-Mo catalyst is used to convert unsaturated compounds into saturated compounds; at a hydrogen-oil ratio of 600:1...

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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...

Claims

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Application Information

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IPC IPC(8): C07C7/163C07C15/04C07C15/08C07C7/04C07C15/06
CPCY02P20/52
Inventor 刘勇武姜茂贵周超熊富才
Owner NEIJIANG TIANKE CHEM
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