Method for synthesizing high purity acetonitrile by ammoniating acetic acid

A technology for chemical synthesis and ammonium acetate, applied in chemical instruments and methods, carboxylic acid nitrile purification/separation, organic chemistry, etc. Simple process and high product purity

Inactive Publication Date: 2009-12-09
NANTONG ACETIC ACID CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 1. Acrylonitrile by-product method, the production capacity of this process route is restricted by the production of acrylonitrile, the product has many impurities, and it is difficult to meet the requirements of pharmaceutical grade indicators
[0004] 2. The method of synthesizing acetonitrile with methanol and ammonia, the yield of this process route is low, according to literature reports, the yield is less than 60%
[0005] 3. Dehydration of acetamide and phosphorus pentoxide to synthesize acetonitrile, the yield of acetonitrile synthesized b

Method used

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  • Method for synthesizing high purity acetonitrile by ammoniating acetic acid

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Embodiment Construction

[0033] A method for synthesizing high-purity acetonitrile by ammoniation of acetic acid comprises the following steps successively:

[0034] (1) Reaction process

[0035] Acetic acid and liquid ammonia are vaporized separately, acetic acid is preheated to 100-250°C, liquid ammonia is preheated to 100-300°C, the two preheated gases enter the top of the reactor after mixing, and then enter the distributor to distribute evenly from the reaction The top of the reactor enters a fixed-bed reactor filled with an acetic acid ammoniation catalyst: the two raw materials undergo an ammoniation reaction at 350-500°C under the action of the catalyst, and the pressure at the top of the reactor is 5Kpa-25Kpa. The reaction molar ratio of the two raw materials is: acetic acid: liquid ammonia = 1: 0.1-1.0; reaction residence time: 3-7S.

[0036] Described catalyzer is the acetic acid ammoniation catalyst of carrier with Al2O3, and the composition of catalyzer is as follows:

[0037] A a B b...

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Abstract

The invention discloses a method for synthesizing high purity acetonitrile by ammoniating acetic acid; acetic acid and liquid ammonia are respectively vaporized, acetic acid is preheated to 100-250 DEG C, liquid ammonia is preheated to 100-300 DEG C, the preheated two gases enter a reactor for mixing, ammoniation reaction is carried out under the action of an acetic acid ammoniation catalyst to obtain acetonitrile. The invention has available materials, simple technology, easy operation and high purity of the product.

Description

Technical field: [0001] The present invention relates to a kind of synthetic method of acetonitrile. Background technique: [0002] Acetonitrile is a colorless transparent liquid with a slight ether-like odor. The most important use is as a solvent. For example, as a solvent for extracting butadiene, a solvent for synthetic fibers and a solvent for some special coatings. Solvents used in the petroleum industry to remove tar, phenol, etc. from petroleum hydrocarbons. In the oil industry, it is used as a solvent for extracting fatty acids from animal and vegetable oils, and in medicine as a reaction medium for the recrystallization of steroid drugs. When a polar solvent with a high dielectric constant is required, a binary azeotropic mixture of acetonitrile and water is often used: it contains 84% ​​acetonitrile and has a boiling point of 76°C. Acetonitrile is an intermediate of medicine (vitamin B1), spices, and a raw material for the manufacture of s-triazine nitrogen fe...

Claims

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Application Information

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IPC IPC(8): C07C255/03C07C253/22C07C253/34B01J23/78B01J23/80B01J23/88B01J21/06B01J23/889B01J23/02B01J23/06B01J23/30B01J23/14B01J23/18B01J27/14
Inventor 丁彩峰朱小刚刘芳周新建薛建锋
Owner NANTONG ACETIC ACID CHEM
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