SU1033423A1 - Method of producing potassium sulfide - Google Patents

Abstract

A method for producing potassium sulfide by reducing its sulfate with natural gas at 880-920 s, characterized in that, in order to increase the yield of the target. the product and the degree of its purity, the process is carried out in the presence of water vapor, in a volume ratio of water vapor: natural gas 1.2 1, 4.

Description

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00 The invention relates to a method for producing potassium sulfide, which is used in the manufacture of dyes, potash, and other fields of the chemical industry. A known method of producing sulfide and potassium from sulphate; potassium, consisting in the fact that the initial K2.S04 is mixed with magnesium oxide in the ratio of 0.7 7 2.3 and the resulting mixture is subjected to reduction with natural gas at 800-1050 ° C. Further, potassium sulfide is leached from the solid products. Magnesium oxide is separated from the solution, dried and returned to the process. From the solution, the crystallized which, after drying, is packaged as. . finished product tl. The degree of conversion of potassium sulfate in K is 5, 98, 5-99.5%. The disadvantage of this method is its multistage, as well as the need to carry out the process in the presence of MgO. The closest to the proposed technical essence and the achieved result is a method for producing potassium sulfide, which includes recovery in natural gas at 800-950 ° C E2. The disadvantage of this method is the low yield of the target product (not higher than 54.4%), as well as its soot pollution resulting from the thermal decomposition of methane - the main component used in this process of natural gas reducing agent. The purpose of the invention is to increase the yield of the product and an increase in its purity by eliminating the formation of soot. The goal is achieved by the fact that the reduction of 1 Kd SQj, by natural gas occurs in the presence of 1000

8 th 900 900

100

67 75 80

50 56 62 VII of water vapor, taken in a volume ratio: CH-1.2-1.4. As shown by experiments with a volume ratio Hzr: CH 1.2-1.4, a product yield of 85% is provided, and due to the suppression of methane decomposition during the process, the finished product is not polluted with soot. At a ratio of less than 1.2, carbon black is characterized by soot. In this . In this case, the inhibitory effect of water vapor takes place, on which, the presence of potassium compounds — products and intermediates of potassium sulfate reduction — has a strong effect. Temperature conditions (OK) and the absence of characteristic catalysts exclude steam reforming of methane. The reason for the absence of soot in the resulting product cannot be the interaction of soot with water vapor, since, under our conditions, this process is very slow. A further increase in the ratio: CHd (more than 1,) does not affect the quality of the final product, but leads to an increase in the length of the process due to a decrease in the concentration of the reducing agent. Example. Dispersed (40 g) with a granule size of 0.2-0.4 mm is loaded into a reactor with a diameter of 46 mm. The layer is placed on a perforated gas distribution grid, where it is heated to a working temperature (880-920 ° C) in a stream of nitrogen. Upon reaching the required temperature instead of nitrogen, a mixture of natural gas with steam is supplied at. with respect to: CH 1,2 - 1,4. Recovery time 15 min. The resulting product is analyzed for the content of K2.S and carbon black. The results of the experiments are shown in the table.

As can be seen from the table, optimal sulfate leads to a weakening of the inhibitory volume ratio; Before the operation of the process in the proposed method increases the yield in the range of 880–920 e, the Left product is up to 81–87% compared to 1.2–1.4, and the increase in with 54% known as well

For the purpose of increasing the temperature, the aim is to increase the rate of reduction of the contamination.

Claims (1)

METHOD FOR PRODUCING POTASSIUM SULPHIDE BY RECOVERY OF ITS SULF? veil natural gas at 880-920 ° C, characterized in that, in order to increase the yield of the target product and its purity, the process is conducted in the presence of water 'steam taken in volume ratio water vapor: natural gas = 1.2 1.4 . 00 OO 4 ^ u