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The method of absorbing acrylonitrile

An acrylonitrile and absorption tower technology, which is applied in the purification/separation of carboxylic acid nitrile, sustainable manufacturing/processing, chemical industry, etc., can solve the problems of large amount of absorbed water and low concentration of acrylonitrile, and achieve the effect of reducing energy consumption

Active Publication Date: 2018-01-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the low concentration of acrylonitrile in the absorption liquid and the large amount of water absorbed in the previous literature, and a new absorption method containing acrylonitrile is provided.

Method used

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  • The method of absorbing acrylonitrile
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] according to figure 1 Schematic diagram of the flow chart, the two streams of gas phase and liquid phase from the aftercooler enter the bottom and middle of the first absorption tower respectively, and lean water enters the top of the second absorption tower. The flow rate of each component in the gas phase is: acrylonitrile 5986.5 kg / h, acetonitrile 165.1 kg / h, hydrocyanic acid 594.7 kg / h, water 1401.6 kg / h, acrolein 15.4 kg / h, carbon monoxide 360.9 kg / h, carbon dioxide 1214.5 kg / hour, oxygen 705.1 kg / h, nitrogen 32477.7 kg / h, propane 103.3 kg / h, propylene 248.9 kg / h. The flow rate of each component in the liquid phase is: 422.7 kg / hour of acrylonitrile, 42.4 kg / hour of acetonitrile, 46.4 kg / hour of hydrocyanic acid, 12275.5 kg / hour of water, and 1.6 kg / hour of acrolein. The lean water is 79250.6 kg / hour, and the circulating absorption liquid is 42882.0 kg / hour. The gas phase flow at the top of the first absorption tower is 35316.9 kg / h, of which the flow rates of ...

Embodiment 2

[0033] With embodiment 1, only change absorption pressure, the second absorption tower pressure is 0.034MPa, other is with embodiment 1. The gas phase flow at the top of the first absorption tower is 35264.0 kg / h, of which the flow rates of acrylonitrile, acetonitrile and hydrocyanic acid are 3.0 kg / h, 0.0001 kg / h, and 12.1 kg / h respectively, and enter the bottom of the second absorption tower. The temperature at the top of the first absorption tower is 4.9°C, the pressure is 0.049MPa, the temperature at the bottom of the tower is 25.8°C, and the feeding position is in the middle.

[0034] The temperature at the top of the second absorption tower is 4.7°C, the pressure is 0.034MPa, and the temperature at the bottom of the tower is 4.6°C. After absorption, the absorption tail gas at the top of the tower is discharged, the flow rate is 35255.6 kg / hour, and the total concentration of acrylonitrile, acetonitrile and hydrocyanic acid is 0.3ppm. The flow rate of the bottom liquid o...

Embodiment 3

[0037]Same as Example 1, only the liquid-gas ratio is changed, and the lean water is 89250.6 kg / hour. Others are with embodiment 1. The gas phase flow at the top of the first absorption tower is 35288.8 kg / h, of which the flow rates of acrylonitrile, acetonitrile and hydrocyanic acid are 3.8 kg / h, 0.0002 kg / h, and 15.1 kg / h respectively, and enter the bottom of the second absorption tower. The temperature at the top of the first absorption tower is 4.8°C, the pressure is 0.029MPa, the temperature at the bottom of the tower is 23.9°C, and the feeding position is in the middle.

[0038] The temperature at the top of the second absorption tower is 4.7°C, the pressure is 0.014MPa, and the temperature at the bottom of the tower is 4.6°C. After absorption, the absorption tail gas at the top of the tower is discharged, the flow rate is 35282.6 kg / hour, and the total concentration of acrylonitrile, acetonitrile and hydrocyanic acid is 0.4ppm. The flow rate of the liquid in the secon...

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Abstract

The invention relates to an absorbing method for acrylonitrile, and mainly aims at solving the problems that in the prior art, the absorption water consumption is high, and the concentration of the acrylonitrile in absorption liquid is low. According to the technical scheme, the method comprises the steps that gas-phase raw material flow containing the acrylonitrile and the like and liquid-phase raw material flow enter the bottom and the middle of a first absorption tower respectively, gas-phase material flow III is separated out at the tower top, and absorption liquid of the first absorption tower is extracted from the tower bottom of the first absorption tower; the absorption liquid of the first absorption tower serves as cyclic absorption liquid of the first absorption tower to be circularly cooled and then returns to the middle of the first absorption tower; the gas-phase material flow III enters the bottom of a second absorption tower, after poor water absorption and cold energy recovery are performed in the second absorption tower, light components of the second absorption tower are exhausted, and tower bottom liquid of the second absorption tower returns to the tower top of the first absorption tower. Accordingly, the problems are better solved, and the method can be applied to industrial production for preparing acrylonitrile through propylene ammoxidation.

Description

technical field [0001] The invention relates to a method for absorbing acrylonitrile in the production process of acrylonitrile. Background technique [0002] Acrylonitrile is an important organic chemical basic raw material, mainly used to produce chemical products such as acrylic fiber, acrylonitrile-butadiene-styrene plastic (ABS), polyacrylonitrile, acrylamide, nitrile rubber, etc., and its by-product acetonitrile It is an excellent solvent and an intermediate in organic synthesis. The by-product hydrocyanic acid can be made into sodium cyanide or acetone cyanohydrin nearby, which is used as a raw material for the synthesis of methacrylic acid. Acrylonitrile production process goes through cyanohydrin method and acetylene method. At present, the main production method at home and abroad is the ammoxidation and oxidation of propylene. In this process, the raw material gas propylene, ammonia, and air are passed into the fluidized bed reactor from the bottom in a certain ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C255/08C07C253/34
CPCY02P20/50
Inventor 邵百祥卢和泮
Owner CHINA PETROLEUM & CHEM CORP