METHOD OF OBTAINING CALCIUM POLYSULPHIDE SOLUTIONS Russian patent published in 2014 - IPC C01B17/43 

FIELD: chemistry.

SUBSTANCE: method of obtaining calcium polysulphide solutions from calcium hydroxide or oxide, hydrogen sulphide and elementary sulphur includes three stages: saturation of water, a water-alcohol or alcohol suspension of calcium hydroxide or oxide with hydrogen sulphide, mixing the calcium hydrosulphide solution or suspension with water, the water-alcohol or alcohol suspension of calcium hydroxide or oxide and mixing the calcium sulphide suspension with elemental sulphur. The first stage of the process is carried out in two successively located absorbing columns at a temperature of 5-70°C with a molar ratio of calcium hydroxide or oxide to hydrogen sulphide in the first absorption column from 1:1 to 1:3. The second stage of the process is carried out at a temperature of 5-40°C and a molar ratio of calcium hydroxide or oxide to calcium hydrosulphide from 1:1 to 1.2:1. The third stage of the process is carried out at a temperature of 5-40°C and a molar ratio of calcium sulphide to elemental sulphur from 1:1 to 1:5.

EFFECT: invention makes it possible to increase the output of the target product with reduction of energy consumption, increase values of the average degree of water solutions sulphidity, eliminate admixture products.

10 cl, 1 dwg, 1 tbl