Method for producing pulverulent solids from alkali salts of silanols

A process for producing a pulverulent solid comprising one or more alkali metal organosiliconates, comprising:

• spray drying an aqueous solution of one or more alkali metal organosiliconates prepared by reacting one or more organosilanes of the formula 1
• (R1)aSi(Y)b(—Si(R2)3−c(Y)c)d (1)
• or hydrolysis/condensation products thereof, or by reaction of organosilanes of the formula 1 and also hydrolysis/condensation products thereof,
• with water and a basic alkali metal salt, and removing liberated dissociation products HY,
• where
• R1, R2 are each a methyl radical,
• Y is hydrogen, F, Cl, Br or OR4 and
• R4 is a methyl, ethyl, 1-propyl or 2-propyl group,
• a is 1, 2 or 3 and
• b, c, d are each 0, 1, 2 or 3,
• with the proviso that b+c≥1 and a+b+d=4,
• where the amount of basic alkali metal salt is such that there is at least 0.1 mol and not more than 3 mol of alkali metal cations per 1 mol of silicon,
• wherein the alkali metal organosiliconate(s) have a molar ratio of alkali metal to silicon of from 0.1 to 3, and prior to spray drying, have a content of alcohol of less than 0.02% by weight, and a content of halide anions of not more than 1% by weight.