METHOD OF OBTAINING LOOSE POWDER, CONTAINING ONE OR SEVERAL GLYCIN-N,N-DIACETIC ACID DERIVATIVES, AND APPLICATION OF LOOSE POWDER FOR OBTAINING PRESSED AGGLOMERATES Russian patent published in 2014 - IPC C07C229/16 B01J2/16 C11D3/33 C11D7/32 C11D11/02 C11D17/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining loose powder, containing one or several glycin-N,N-diacetic acid derivatives of general formula VOOC - CHR - N(CH₂COOM)₂ (I), from a water solution as an initial material, containing one or several glycin-N,N-diacetic acid derivatives, which is dried by a method of spray drying with the air supply. The method is characterised by the following: the water solution contains one or several glycin-N,N-diacetic acid derivatives in a quantity of ≥84 wt % counted per the total weight of the dry substance. Spray drying is carried out in a drying apparatus, into which the water solution and air are supplied in a continuous-flow mode with the difference of temperatures between the water solution and air in the range from 70 to 350°C. The water solution is dispersed in the drying apparatus with the formation of tiniest liquid drops by its supply onto one or several discs, rotating at a linear rate of ≥100 m/s, or by the creation in it of absolute pressure ≥20 bar by a pump and its supply under the said pressure into the drying apparatus through one or several nozzles. In formula (I) R stands for an alkyl group with the number of carbon atoms from one to twelve and M stands for an alkali metal. The invention also deals with the application of the claimed loose powder for the production of pressed agglomerates, which can be used in solid or liquid cleaning means.

EFFECT: claimed method makes it possible to obtain the powder, possessing good bulk weight, flowability and storage stability.

13 cl, 3 ex