FIELD: organic chemistry and chemical technology. SUBSTANCE: process is carried out at increased temperature and pressure in nitrogen medium or its mixture with hydrogen sulfide on copper- or nickel-containing contacts placed by zones. Copper-containing contact is placed in the first zone and nickel-containing contact - in the second zone at their mass ratio =(30-50): (70-50). EFFECT: increased sulfur capacity of contacts, prolonged working time. 5 cl, 3 tbl, 3 ex
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