Method for performing refined separation on high-purity yellow phosphorous

Abstract

The invention discloses a method and a device for performing refined separation on high-purity yellow phosphorous. A raw material storage tank is connected with a tower bottom; a rectifying tower is positioned above the tower bottom; one end of a condenser is connected with a tower top of the rectifying tower, while the other end is connected with a return tank; the return tank is connected with the tower top of the rectifying tower through a return flowmeter and connected with a front fraction tank and a product tank through a product flowmeter, and a discharge pipe of the product tank is connected with a product collecting tank; a vacuum pump is connected with the condenser, the return tank, the front fraction tank and the product tank through a buffer tank; and a nitrogen tank is connected with the raw material storage tank, the condenser, the return tank, the front fraction tank and the product tank. Through operation of performing rectification under reduced pressure and changinga reflux ratio, the method and the device reduce the boiling point of each component of the material greatly, change the relative volatility among the components, and have the advantages of uniform heating in the tower bottom, simple operation process, high separation efficiency and high purity of the product at the same time.

Description

technical field [0001] The invention relates to a separation method of high-purity yellow phosphorus in phosphorus chemical industry, in particular to a separation method and device for purifying high-purity yellow phosphorus by vacuum batch rectification. Background technique [0002] Yellow phosphorus, also known as white phosphorus, is an important basic industrial raw material. Pure white phosphorus is a white waxy solid with a glossy appearance. It quickly changes color to yellow under the action of light and heat, so it is often called yellow phosphorus. High-purity yellow phosphorus is a high value-added product of phosphorus chemical products. With the development of high-quality phosphorus chemicals and semiconductor fields, the market has put forward higher requirements for the quality of yellow phosphorus products, especially the production of industrial-grade yellow phosphorus High-purity yellow phosphorus from 4N to 7N grades is recognized by many fields. [00...

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Problems solved by technology

U.S. Patent UP4483746 discloses a process for the purification of yellow phosphorus using physical methods. It uses simple distillation to purify its yellow phosphorus. The arsenic content of the refined and separated yellow phosphorus is about 1.0PPM, and the total impurity metal ions are 100ppm; (Inorganic Salt Chemical Industry, 2004,36 (2): 24~28) studied the method that adopts oxidizing agent to carry out purification and separation of yellow phosphorus by the method of extraction+adsorption then in experimental stage; Document (Chemical Ing Tech, 1964,26: 957-959) studied the method of purifying industrial yellow phosphorus by using the regional melting method, but the proposed efficiency was low; literature research used the method of electromagnetic purification to refine yellow phosphorus, which method does not need to add chemical reagents and consumes less energy, but its Research is in its infancy and is not yet ready for industrial application

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