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A kind of refining method and device for ammoniation of acetic acid to synthesize acetonitrile

A purification method and acetic acid ammoniation technology, applied in the purification/separation of carboxylic acid nitrile, organic chemistry, etc., can solve the problems of large steam consumption, large equipment area, long process flow, etc., and achieve high safety factor and operation. The effect of reduced energy consumption and simple process

Active Publication Date: 2017-01-18
JIANGSU NINE HEAVEN HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of process consumes a lot of steam, occupies a large area of ​​equipment, has a long process flow, a large amount of material and liquid circulation, complicated operation, and low yield of acetonitrile

Method used

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  • A kind of refining method and device for ammoniation of acetic acid to synthesize acetonitrile
  • A kind of refining method and device for ammoniation of acetic acid to synthesize acetonitrile

Examples

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Comparison scheme
Effect test

Embodiment 1

[0046] The refining method for the synthesis of acetonitrile by the ammoniation of acetic acid, using equipment such as figure 1 As shown, the operation process includes the following steps: the crude product obtained from the acetic acid amination reactor is sequentially entered into the two-stage acid absorption tower for absorption. The absorption tower contains dilute sulfuric acid solution, and the acetonitrile mother liquor is collected at the bottom of the absorption tower. The non-condensable gas is vented from the top of the absorption tower, and the remaining material in the tower is acetonitrile mother liquor (water content of about 50wt.%), and then sent to the enrichment tower for concentration. After the concentration, the acetonitrile content is increased to about 80wt.% to obtain an aqueous acetonitrile solution. Transported to the intermediate tank, ammonium salt and part of the water are discharged from the bottom of the tower. The acetonitrile aqueous solution...

Embodiment 2

[0052] The refining method for the synthesis of acetonitrile by the ammoniation of acetic acid, using equipment such as figure 1 As shown, the operation process includes the following steps: the crude product obtained from the acetic acid amination reactor is sequentially entered into the two-stage acid absorption tower for absorption. The absorption tower contains dilute sulfuric acid solution, and the acetonitrile mother liquor is collected at the bottom of the absorption tower. The non-condensable gas is vented from the top of the absorption tower. The acetonitrile mother liquor (with water content of about 60wt.%) is sent to the enrichment tower for concentration. After the concentration, the acetonitrile content is increased to about 70, 75, 80, and 84wt.% respectively. The resulting acetonitrile aqueous solution is transported to the intermediate tank, where the ammonium salt and part The water is discharged from the bottom of the tower. The control flow rate of the mater...

Embodiment 3

[0058] The refining method for the synthesis of acetonitrile by the ammoniation of acetic acid, using equipment such as figure 1 As shown, the operation process includes the following steps: the crude product obtained from the acetic acid amination reactor enters the two-stage acid absorption tower in turn for absorption, the acetonitrile mother liquor is collected at the bottom of the absorption tower, and the non-condensable gas is vented from the top of the absorption tower . The acetonitrile mother liquor (with water content of about 45wt.%) is sent to a concentration tower for concentration. After concentration, the acetonitrile content is increased to about 80wt.%. The resulting acetonitrile aqueous solution is transported to the intermediate tank, and the ammonium salt and part of the water are discharged from the bottom of the tower. The acetonitrile aqueous solution in the intermediate tank is controlled at a flow rate of 1600kg / h and transported to the evaporator for h...

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Abstract

The invention relates to a refining method and device for synthesizing acetonitrile from acetic acid by ammoniation. The refining method comprises the following steps: feeding a crude product obtained in an acetic acid ammoniation reaction section into an absorption section; absorbing the crude product by using an acid absorbent in two stages so as to obtain an acetonitrile mother liquid and a tail gas; feeding the acetonitrile mother liquid into a concentrating tower, concentrating to obtain an acetonitrile aqueous solution, and feeding the acetonitrile aqueous solution into an intermediate tank; feeding the concentrated acetonitrile aqueous solution as a feed into a pervaporation separation machine set, and separating so as to obtain crude acetonitrile; enabling water and a small amount of acetonitrile in a feed solution to penetrate through a pervaporation membrane in a steam manner so as to obtain a penetrating fluid, condensing the penetrating fluid, feeding the penetrating fluid back to the concentrating tower, and further feeding the product on the top of the tower back to the pervaporation separation machine set; and feeding the crude acetonitrile obtained from the pervaporation separation machine set back to a rectifying tower, thereby obtaining finished acetonitrile. In the recycling process, the refining method is high in recycling rate, simple in process, high in security coefficient, high in energy utilization rate, small in material liquid circulation amount, low in operation energy consumption and free of a third component.

Description

Technical field [0001] The invention relates to a refining method and device for the ammoniating of acetic acid to synthesize acetonitrile, in particular to a method and device for synthesizing acetonitrile by the pervaporation method of refining acetic acid by ammoniating method, and belongs to the application field of pervaporation membranes. Background technique [0002] The main purpose of acetonitrile is as a solvent, such as an extractant for extracting butadiene, isoprene, a spinning solvent for synthetic fibers, and a solvent for certain oils, phenols and colored substances; in the oil industry Solvent for extracting fat from animal and vegetable oils; used in medicine as a reaction medium for the recrystallization of steroid drugs. Acetonitrile is also an intermediate of medicine (vitamin B1) and perfume, and is a raw material for preparing 2-picoline, triazine, ethylamine, dipropionitrile, imidazole, propylene bisacetonitrile, etc. [0003] In the traditional process of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/03
Inventor 顾学红郭海超余从立庆祖森
Owner JIANGSU NINE HEAVEN HIGH TECH