High-purity acetonitrile and process for producing the same

A manufacturing method and a high-purity technology, which are applied in the purification/separation of carboxylic acid nitrile, organic chemistry, etc., can solve the problem that the purification method is difficult to meet, and achieve the effects of suppressing the increase in cost, less energy consumption, and simple process

Active Publication Date: 2008-04-30
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Existing purification methods are difficult to achieve the quality that meets this requirement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] The present invention is illustrated below by Examples and Comparative Examples. The ultraviolet absorbance was measured by the following method.

[0064] Using an automatic spectrophotometer UV3101PC manufactured by Shimadzu Corporation, distilled water was used as a target liquid, and the absorbance at a wavelength of 190 nm to 500 nm was measured using a 1 cm square absorption dish made of quartz. The scanning speed is medium speed, and the slit width of the beam splitter is set at 5 nm.

Embodiment 1

[0068] A 27 mm diameter column was packed with cation exchange resin (Amberlyst 15JWET) to a layer height of 700 mm. The fill volume is 400mL. At 20° C., 4000 mL of the purified acetonitrile of Comparative Example 1 was passed through at a rate of 100 (mL / min). When analyzed, the absorbance of ultraviolet absorption at a wavelength of 200 nm was 0.17 abs / cm, the absorbance of ultraviolet absorption at a wavelength of 254 nm was 0.001 abs / cm, and the propionitrile was 20 weight ppm.

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Abstract

The present invention relates to high-purity acetonitrile and its production method. The object of the present invention is to provide a kind of method of manufacturing high-purity acetonitrile, wherein, the absorbance of high-purity acetonitrile under the wavelength 200nm is low, and this method is that the used energy of purification is few and the technique of purification operation is simple, obviously reduces the content in acetonitrile of propionitrile. The invention relates to a method for producing high-purity acetonitrile, which is characterized in that the crude acetonitrile with water is mixed with an alkali, separated into an acetonitrile phase and a water phase, and then the water phase is removed, and the obtained acetonitrile phase is subjected to a distillation process to obtain purified acetonitrile, The resulting purified acetonitrile is passed through a cation exchange resin to obtain high-purity acetonitrile.

Description

technical field [0001] The invention relates to high-purity acetonitrile and a method for producing high-purity acetonitrile. Background technique [0002] Currently, commercially available acetonitrile is mainly obtained by recovering and purifying the following crude acetonitrile, which is produced by contacting ammoxidation of propylene or isobutylene with ammonia and molecular oxygen to produce acrylonitrile or methacrylonitrile obtained as a by-product. [0003] The crude acetonitrile obtained as a by-product contains allyl alcohol, oxazole, water, acetone, hydrocyanic acid, acrylonitrile, methacrylonitrile, acrolein, propionitrile, cis- and trans-acrylonitrile, acrylic acid, Methyl acrylate, methacrylic acid, methyl methacrylate, acetic acid, acrolein, methacrolein, acetone and other impurities and impurities that cannot be analyzed. [0004] Acetonitrile is used as a solvent for chemical reactions, especially as a solvent for the synthesis and purification of pharma...

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 佐野和彦大山菊男日名子英范
Owner ASAHI KASEI KK
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