Acetonitrile refining process

An acetonitrile and process technology, applied in the field of acetonitrile refining process, can solve the problems of large gap and few manufacturers of reagent-grade products, and achieve the effect of guaranteeing and maintaining stability

Active Publication Date: 2016-04-27
中石油吉林化工工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a large gap in the market for reagent-grade acetonitrile products (the weight percent concentration of acetonitrile is 99.999%), and there are very few manufacturers of reagent-grade products

Method used

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  • Acetonitrile refining process

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Embodiment Construction

[0023] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0024] refer to figure 1 , an embodiment of the acetonitrile refining method of the present invention comprises the following steps.

[0025] Execute step 1: dehydrate the acetonitrile raw material 5. Wherein, the acetonitrile raw material 5 is a pharmaceutical-grade acetonitrile product, that is, the weight percent concentration of acetonitrile therein is 99.9%, in other words, the weight of acetonitrile divided by the weight of the acetonitrile product is equal to 99.9%. In this embodiment, the dehydrator 1 is used to dehydrate the acetonitrile raw material 5, specifically, the dehydrating agent 10 and the acetonitrile raw material 5 are fed from the top of the dehydrator 1, and the acetonitrile raw material 5 after the dehydration treatment is sent from the dehydrator 1 The bottom of the bottom is pumped into the distillation tower 2, and the water...

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Abstract

The invention relates to an acetonitrile refining process. The process comprises the following steps: 1, dehydrating acetonitrile raw material (5); 2, carrying out fractional distillation on the dewatered acetonitrile raw material (5) in a distillation column (2) and discharging the distilled gas-phase acetonitrile product (8) from the top of the distillation column (2). The invention aims to prepare a medicine-grade acetonitrile product into a regent-grade acetonitrile product. Particularly, the acetonitrile raw material is dehydrated and then sent into the distillation column; in the distillation column, and when the gas phase formed by gasifying the material at the bottom of the distillation column moves up in the distillation column, the gas phase gradually changes into a liquid phase and flows back to the kettle of the distillation column; therefore, the concentration (wt%) of acetonitrile in the gas-phase acetonitrile product discharged out from the top of the column is higher than the concentration (wt%) of acetonitrile in the acetonitrile raw material and acetonitrile is refined finally.

Description

technical field [0001] The invention relates to an acetonitrile refining process. Background technique [0002] At present, the concentration of acetonitrile in the acetonitrile product in the acetonitrile plant is usually 99.9%, the water content and the propionitrile component are about 500ppm, and this acetonitrile product is pharmaceutical grade. However, there is a large gap in the market for reagent-grade acetonitrile products (the weight percent concentration of acetonitrile is 99.999%), and there are very few manufacturers of reagent-grade products. Wherein, the concentration of acetonitrile is the ratio of the weight of acetonitrile in the acetonitrile product to the weight of the acetonitrile product. Contents of the invention [0003] Aiming at the problems existing in the related art, the object of the present invention is to provide a kind of acetonitrile refining process of manufacturing pharmaceutical grade acetonitrile product into reagent grade acetonitri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C253/34C07C255/03
Inventor 杨晓光刘清娟李大伟史广明王艳红杨素珍肖淑范聂殿涛袁亮林港赵辉
Owner 中石油吉林化工工程有限公司
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