FIELD: chemistry.
SUBSTANCE: invention relates to a method of obtaining powder, containing one or several complexing salts of the general formula 
in which R' stands for hydrogen or one of groupings 
or 
, with R" standing for hydrogen, alkyl residue with 1-12 carbon atoms or -(CH2)q-COOM residue, where q=1-5, n and m in each case represent an integer number from 0 to 5, and R"' represents hydrogen, or an alkyl residue with 1-12 carbon atoms, or an alkylene residue with 1-12 carbon atoms, which can be additionally substituted with hydroxyl groups in up to 5 in number, or one of groupings 
or 
, where o and p in each case represent an integer number from 0 to 5, and M independently on each other stands for an alkali metal, alkali earth metal, ammonium or substituted ammonium in respective stoichiometric amounts, and having the residual humidity in the range from 7 to 14 wt % relative to the total powder weight. The method is carried out basing on a water solution, which contains one or several complexing salts in a concentration from 10 to 80 wt % relative to the total weight of the water solution, by a method of spray drying, which includes a spray stage and a drying stage. The spray stage is carried out with the addition of crystalline finely-disperse dust of the same salt or the same complexing salts as those, contained in the water solution, or one or several different from them complexing salts, with the upper limit of the average particle diameter of the crystalline finely-disperse dust being at least two times smaller than the lower limit of the average diameter of the particle of the powder, obtained in accordance with the method, in an amount from 0.1 to 20 wt % relative to the weight of the powder, obtained in accordance with the method. The composition of washing and cleaning substances, application of the powder and pressed agglomerates are also claimed.
EFFECT: invention makes it possible to obtain the powder, possessing favourable indices of suitability for warehouse storage and to processing, which has higher degree of crystallinity and higher residual humidity un the range from 7 to 14 wt % relative to the total weight and possesses granulated shape.
13 cl, 4 dwg, 4 ex, 2 tbl
