Acetonitrile refining technology and device

A kind of acetonitrile and process technology, applied in the field of acetonitrile refining, can solve the problems of high energy consumption and complicated equipment, and achieve the effects of low energy consumption, equipment cost reduction and cost reduction

Active Publication Date: 2017-05-10
JIANGSU JIUMO HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, this process has disadvantages such as high energy consumption and complicated equipment.
Similarly, the Chinese patent with application number 201410847512.1 also has this disadvantage because of the use of a preferential dehydration membrane

Method used

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  • Acetonitrile refining technology and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: First, the crude acetonitrile solution A produced in the process of producing acrylonitrile by propylene ammoxidation is sent into the flash tank 1 for flash evaporation, and most of the hydrocyanic acid, oxazole and acrylonitrile including hydrocyanic acid, oxazole and acrylonitrile are removed from the top of the tower Low boiling point substance B, the main components of the tower bottom are acetonitrile, water and a small amount of high boiling point substance.

[0038] Then, the tower bottom liquid is sent to the chemical reaction kettle 2, and a strong oxidizing agent and alkali C are added into the chemical reaction kettle 2, the strong oxidizing agent is potassium permanganate, and the alkali is sodium hydroxide. The chemical reaction kettle 2 provides necessary heat, sufficient stirring and a certain residence time, and utilizes the principle that cyanohydrin has poor thermal stability and is easily decomposed in alkaline medium at a higher tempera...

Embodiment 2

[0041] Embodiment 2: First, the crude acetonitrile solution A produced in the process of producing acrylonitrile by propylene ammoxidation is sent into the flash tank 1 for flash evaporation, and most of the hydrocyanic acid, oxazole and acrylonitrile including hydrocyanic acid, oxazole and acrylonitrile are removed from the top of the tower Low boiling point substance B, the main components of the tower bottom are acetonitrile, water and a small amount of high boiling point substance.

[0042] Then, the tower bottom liquid is sent to the chemical reaction kettle 2, and a strong oxidizing agent and alkali C are added into the chemical reaction kettle 2, the strong oxidizing agent is potassium permanganate, and the alkali is potassium hydroxide. After chemical treatment a mixture of acetonitrile, water and heavy components was obtained.

[0043] Next, when the mixture is preheated to 20°C by the heat exchanger 3, it is directly sent into the preferentially permeable organic mat...

Embodiment 3

[0045] Embodiment 3: First, the crude acetonitrile solution A produced in the process of producing acrylonitrile by propylene ammoxidation is sent to the flash tank 1 for flash evaporation, and most of the hydrocyanic acid, oxazole and acrylonitrile including hydrocyanic acid, oxazole and acrylonitrile are removed from the top of the tower Low boiling point substance B, the main components of the tower bottom are acetonitrile, water and a small amount of high boiling point substance.

[0046] Then, the tower bottom liquid is sent to the chemical reaction kettle 2, and a strong oxidizing agent and alkali C are added into the chemical reaction kettle 2, the strong oxidizing agent is sulfuric acid, and the alkali is sodium hydroxide. After chemical treatment a mixture of acetonitrile, water and heavy components was obtained.

[0047] Next, when the mixture is preheated to 50°C by the heat exchanger 3, it is sent directly into the preferentially permeable organic matter membrane s...

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Abstract

The invention relates to an acetonitrile refining technology and a device. The technology comprises the following steps: feeding coarse acetonitrile into a flash evaporation tank for flash evaporation to obtain acetonitrile, water and a few tower bottoms with high boiling point; feeding the tower bottoms into a chemical reaction kettle, and adding a strong oxidizer and alkali to obtain a mixture mainly containing acetonitrile, water and heavy component; preheating the mixture and feeding into a permselective organic membrane separation device, wherein the acetonitrile penetrates the membrane to become permeating vapor through selective pervaporation; vacuumizing on the permeation side; condensing the permeating vapor and then feeding into a rectifying tower; and rectifying and separating to obtain high-purity acetonitrile in the tower kettle. According to the invention, the production technology and equipment are simplified; the adopted specific functional membrane for permselective organic acetonitrile is not limited by azeotropy, the energy consumption for pervaporation is low, the liquid mixture can directly enter the permselective organic membrane separation device, the equipment such as an evaporator is not needed, and the purity of the obtained acetonitrile can exceed 99.99%; and moreover, the technology has the characteristics of easiness in operation, low energy consumption, high yield and low production cost.

Description

technical field [0001] The invention relates to the technical field of acetonitrile purification, in particular to a process and a device for refining acetonitrile. Background technique [0002] Acetonitrile is a transparent colorless polar solution with a high dielectric constant. It is easily soluble in water and other organic solvents, but insoluble in saturated hydrocarbon solutions. As a widely used organic chemical raw material, the main use of acetonitrile is as a solvent , such as extraction agents for isoprene and butadiene from olefins and paraffins, spinning solvents for synthetic fibers, etc., can also be used as mobile phase solvents for organic synthesis, pharmaceuticals, and chromatographic analysis. Industrially, the production methods of acetonitrile include the one-step synthesis method of acetic acid and ammonia, the deproduction method of acetamide and phosphorus pentoxide, the by-product method of propylene ammoxidation, and the synthesis method of alcoh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C253/34C07C255/03
CPCC07C253/34C07C255/03
Inventor 丁晓斌杜运平赵祥强
Owner JIANGSU JIUMO HIGH TECH CO LTD
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