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Method for purifying aniline

A technology for aniline and crude aniline, which is applied in the fields of purification/separation of amino compounds, organic chemistry, etc., and can solve the problems of not considering the disposal process of low boilers, fluctuations in the operation process, and affecting product quality, and achieves short purification process and good reliability , The effect of comprehensive utilization of heat

Pending Publication Date: 2022-03-15
SINOPEC NANJING ENG & CONSTR +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (1) At the beginning of the single-pass service life of the catalyst, the activity of the catalyst is relatively good, and the low boilers exceed the processing load of the refining system, thereby inhibiting the increase in the product load of the device
[0006] (2) The impact of product quality fluctuations caused by the enrichment of low boiling substances during the operation of the product. During the production and operation process, because the original design did not consider the disposal process of low boiling substances, when the aniline wastewater tank is recycled, the crude aniline and low boiling substances There will be fluctuations in the material during operation, which will affect product quality

Method used

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  • Method for purifying aniline
  • Method for purifying aniline
  • Method for purifying aniline

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Experimental program
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Embodiment 1

[0034] The crude aniline from the aniline plant is produced at a temperature of 80 °C and a pressure of 0.3 MPa. The main components are shown in Table 1.

[0035] Table 1 crude aniline composition

[0036]

[0037] The treatment process is as follows: the flow rate of the above components is 6000kg / h. Crude aniline is first heated to 120°C through the aniline product heat exchanger E-01, the light column cooler E-02 and the preheater E-03, and then enters the light Tower C-01, control light tower C-01 tower top operating pressure is -0.075MPaG, tower bottom operating pressure is -0.069MpaG, through light tower reboiler E-04 control tower top and tower bottom operating temperature are 108 ℃ and 144°C; light tower C-01 overhead gas phase 1002kg / h is cooled to 65°C and 20°C respectively by tower top cooler E-05 and tower top condenser E-06, and 81kg of non-condensable gas in condenser E-06 / h (mainly 2.4kg of aniline, 23.7kg of water, 12kg of benzene, 42kg of cyclohexane, 0....

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Abstract

The invention discloses a method for purifying aniline. The method comprises the following steps: preheating crude aniline, removing light components from the crude aniline, separating amine from water and refining the aniline. The method has the advantages of short aniline purification process, low equipment investment cost, simplicity in operation, comprehensive utilization of heat, good reliability, good separation effect and high purity of separated aniline, and meets the requirements of superior aniline products.

Description

technical field [0001] The invention relates to a method for purifying aniline, which belongs to the technical field of petrochemical industry. Background technique [0002] Aniline is one of the most important amines. It is mainly used in the manufacture of dyes, drugs, resins, and can also be used as a rubber vulcanization accelerator. At present, the traditional aniline production method does not consider the disposal process of low boilers at the beginning of the design of the product process. When the aniline wastewater tank is recycled, the crude aniline and low boilers will fluctuate during the operation, which will affect the product quality and produce qualified products. . [0003] In the aniline production process, the light components and water at the top of the initial distillation tower and the material at the top of the stripping tower are returned to the crude product tank in the existing process, and then enter the initial distillation tower of the refinin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/84C07C211/46
CPCC07C209/84C07C211/46
Inventor 李贤杨春和张鹏陈卫红
Owner SINOPEC NANJING ENG & CONSTR
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