Process for the preparation of bleach activator granules
View Patent ↗Process for the preparation of bleach activator granules, which comprises extruding a mixture comprising bleach activator, anionic or nonionic surfactant and polyalkylene glycol at temperatures of from 60 to 80° C. and a pressure of from 10 to 30 bar, and granulating the resultant extrudates at a temperature of from 60 to 80° C. on a spheronizer.
1. A process for the preparation of bleach activator granules, which comprises extruding a mixture comprising bleach activator, anionic or nonionic surfactant and polyalkylene glycol at an extrusion temperature of from 40 to 90° C., and a pressure of from 10 to 30 bar, and granulating the resultant extrudates at a spheronizer temperature of from 60 to 90° C., on a spheronizer.
2. The process as claimed in claim 1 , wherein linear or branched fatty acids or ethoxylated fatty acids having 2 to 100 EO are additionally used.
3. The process as claimed in claim 1 , wherein the anionic surfactant used is an alkylarylsulfonate.
4. The process as claimed in claim 1 , wherein the polyalkylene glycol used is polyethylene glycol.
5. The process as claimed in claim 1 , wherein the bleach activator used is Na nonanoyloxybenzenesulfonate.
6. The process as claimed in claim 1 , wherein granules are prepared which consist of 70 to 90% by weight of Na nonanoyloxybenzenesulfonate, 2 to 10% by weight of alkylbenzenesulfonate, 0.1 to 6% by weight of nonanoic acid and 1 to 15% by weight of polyethylene glycol 4000.
7. The process as claimed in claim 1 , wherein the extrudates are placed directly on the spheronizer or are coarsely precomminuted.
8. The process as claimed in claim 1 , wherein the spheronizer temperature is controlled by introducing a stream of air or gas to the spheronizer.
9. The process as claimed in claim 1 , wherein the spheronizer operates at a peripheral speed of from 10 to 30 m/sec.
10. The process as claimed in claim 1 , wherein the spheronizer has a residence time from 10 to 120 sec.
11. The process as claimed in claim 1 , wherein the spheronizing steps is carried out batchwise or continuously in a cascade operation.
12. The process as claimed in claim 1 , wherein the resulting extrudates are powdered with an anticaking agent.
13. The process of claim 1 , wherein the extrusion temperature ranges from 60 to 80° C.
14. The process of claim 1 , wherein the spheronizer temperature ranges from 60 to 80° C.
15. The process of claim 1 , further comprising passing a cooling stream comprising gas or air to the spheronizer to maintain the spheronizer temperature between 60 and 80° C.