SU937330A1 - Yellow phosphorus purification method - Google Patents

Description

(54) METHOD FOR CLEANING YELLOW Phosphorus

one

This invention relates to methods for purifying yellow phosphorus.

A known method of purification of yellow phosphorus; by treating it with acetic acid at a ratio of phosphorus to acetic acid equal to (0.1–1): temperature 60–110 ° C and stirring with a cKopocTi ra rotation of the stirrer 300 rpm. After leaving the phases and the separation of phosphorus from acetic acid, a product is obtained, the impurity content of which is, wt%: organic impurities 0.0030, 014; iron MO - 1.5-10. The degree of purification is,%: from organic impurities 94.8-98.9; from iron 89, 93 1.

The disadvantage of this method is the high corrosivity of the solvent.

A known method of purification of yellow phosphorus by treating it with cyclohexanone with a phosphorus-cyclohexanone ratio of 1: 1, a temperature of 45-60 ° C, a stirring time of 15-20 seconds and a stirrer speed of 1500 rpm. After settling the phases and separating the phosphorus from the solvent, a product is obtained, the degree of purification of which is from impurities.

%: organic impurities 98.5; same leso 28; manganese 30; magnesium 19.5 and lead 25.1 (2.

A disadvantage of the known sporob is the low degree of purification from inorganic impurities.

The purpose of the invention is to increase the degree. cleaning up.

The goal is achieved by the fact that according to the method of purification of yellow phosphorus, phosphorus is treated with pyridine or its mixture with water at elevated temperature and stirring, followed by settling and removing the product from the solvent.

Purification of yellow phosphorus is carried out at a weight ratio of phosphorus-pyridine equal to 1: 1, temperature 60-80 ° C, time stirring for 5-15 seconds, and rotation speed of the stirrer 1000-1500 rpm. It is advisable to use. 50-809-th aqueous solutions of pyridine.

Claims (2)

Example. 100 g of yellow phosphorus, containing orymesi, wt.%: Organic iron 1.4 weight 5 ,. Manganese 1.8 Lead 1.1-10, at 6080 ° C and stirring for 5 s, treated with pyridine with a phosphorus-pyridine weight ratio of 1: 1. The resulting emulsion is then decanted, the phosphorus is separated and washed with water from pyridine. Purified phosphorus contains impurities wt.%: Organic 7,010, iron 1, magnesium 3,610; manganese 1.510 and lead 1.8 10 The yield of purified phosphorus is 99.6%. Five portions of yellow phosphorus are purified in one portion of pyridine, after which pyridine is purified and purified. P; example2. SEC of yellow phosphorus is similar to the mode of example 1 for 15 s is treated with 50% aqueous solution of pyridine with a weight ratio of phosphorus-pyridine, equal to 1: 1. After settling, separating phosphorus and washing it from pyridine, the content of impurities in the product is as follows: Vgs.%: Organic 1, Iron 2.2. Magnesium 2, Arganese 1s B 10. - And lead 2,9 10. Wasted phosphorus is 99.8%. When using the proposed method, the degree of purification from inorganic impurities increases to .73.6-99.1%. The proposed method makes it cheaper to purify yellow phosphorus by using five times the solvent, to obtain a high-quality product that can be used directly in the production of five-grain phosphorus. Claims A method for purifying yellow phosphorus by treating it with an organic solvent at elevated temperature and stirring, followed by settling and separating the product from the solvent, characterized in that pyridine or erd mixture with water is used as organic solvent. Sources of information taken into account during the examination 1. USSR author's certificate No. 582643, cl. From 01 to 25/047, 1976. 2. USSR author's certificate number 687758, cl. From 01 to 25/047, 1978.