TUNGSTATE-CONTAINING CATALYSTS FOR SYNTHESIS OF ALKYL MERCAPTAN AND METHOD OF PREPARING SAID CATALYSTS Russian patent published in 2010 - IPC B01J23/30 B01J23/04 C07C319/08 

FIELD: chemistry.

SUBSTANCE: catalyst for synthesis of alkyl mercaptans has a support or contains support material and catalytically active tungstate which contains at least one chemically bonded alkali metal and tungsten having formula A_xWO_y, in which A denotes at least one alkali metal (provided that caesium can be present only combined with another element from the group of alkali metals), x denotes a number ranging from 0.9 to less than 2, and y denotes a number ranging from 3.4 to less than 4. The method of preparing a catalyst which contains tungstate of an alkali metal involves a) impregnation of a supports or support material with an aqueous solution containing dissolved compounds of alkali metal(s) and tungsten in the required molar ratio between the alkali metal(s) and tungsten, b) the obtained impregnated moulded supports or the obtained impregnated fine-grained support material (catalyst prepared beforehand) are subjected to preliminary drying at room temperature, c) if necessary, drying is carried out at temperature ranging from 100 to 200°C in order to remove residual moisture, d) final calcination is done for 2-10 hours at temperature ranging from 300 to 600°C and e) a supported catalyst or impregnated fine-grained support material containing a promoter with general formula A_xWO_y is obtained, where A denotes at least one alkali metal (provided that caesium can be present only combined with another element from the group of alkali metals), x is a number from 0.9 to less than 2, and y is a number from 3.4 to less than 4, in amount ranging from 8 to 45 wt %, preferably from 15 to 36 wt %, after which e) the impregnated fine-grained support material is suspended by adding known additives and then deposited on core-support made from inert material or extruded and moulded.

EFFECT: obtaining a catalyst which has high activity and selectivity at low molar ratio of hydrogen sulphide to methanol.

25 cl, 8 ex, 1 tbl