Process for making a granule

Patent metadata

Field	Value
Publication number	US-12351776-B2
Application number	US-202117911741-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 17, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

Process for making a powder or granule containing(A) at least one chelating agent selected from alkali metal salts of methyl glycine diacetic acid (MGDA) and of iminodisuccinic acid (IDS),(B) at least one compound of general formula (I a) or (I b)wherein A1 is selected from (CH2)a wherein the variable a is in the range of from 4 to 20,e is selected from zero and 1, andR1 being the same or different and selected from O—C1-C10-alkyl and C1-C10-alkyl,and, optionally,(C) at least one homo- or copolymer of (meth)acrylic acid, partially or fully neutralized with alkali,said process comprising the steps of(a) providing an aqueous solution or slurry containing chelating agent (A) and said compound (B) and, if applicable, (co)polymer (C), with a pH value in the range of from 10 to 12,(b) removing most of said water by spray drying or spray granulation.

First claim

The invention claimed is:

1. A process for making a powder or granule comprising
(A) at least one chelating agent selected from alkali metal salts of methyl glycine diacetic acid (MGDA) and of iminodisuccinic acid (IDS), and
(B) at least one compound of general formula (I a) or (I b)

wherein A 1 is selected from (CH 2 ) a wherein the variable a is in the range of from 4 to 20, and
e is selected from zero and 1,
R 1 being the same or different and selected from C 1 -C 10 -alkyl and O-C 1 -C 10 -alkyl, and, optionally,
(C) at least one homo-or copolymer of (meth) acrylic acid, partially or fully neutralized with alkali,
said process comprising the steps of
(a) providing an aqueous solution or slurry containing chelating agent (A) and said compound (B) and, if applicable, (co) polymer (C), and
(b) removing most of said water by spray drying or granulation.

2. The process according to claim 1 , wherein in step (b), a gas with an inlet temperature of more than 125° C. is used.

3. The process according to claim 1 , wherein, in the solution of step (a), the molar amount of alkali is lower than the molar amount of carboxyl groups of chelating agent (A) and-if applicable-(co) polymer (C).

4. The process according to claim 1 , wherein the amount of compound (B) is in the range of from 50 to 2,500 ppm by weight, referring to chelating agent (A).

5. The process according to claim 1 , wherein the weight ratio of chelating agent (A) and (co) polymer (C) is in the range of from 100:1 to 4:1.

6. The process according to claim 1 , wherein step (b) is performed with a two-fluid nozzle.

7. The process according to claim 1 , wherein step (b) is followed by a step (c) including separating off fines.

8. The process according to claim 1 , wherein the pH value of the aqueous solution or slurry provided in step (a) is the range of from 9 to 12.

9. A powder or granule comprising
(A) at least one chelating agent selected from alkali metal salts of methyl glycine diacetic acid (MGDA) and iminodisuccinic acid (IDS), and
(B) at least one compound of general formula (I a) or (I b)

wherein A 1 is selected from (CH 2 ) a wherein the variable a is in the range of from 4 to 20, e is selected from zero and 1, and
R 1 being the same or different and selected from C 1 -C 10 -alkyl and O-C 1 -C 10 -alkyl, and, optionally,
(C) at least one homo-or copolymer of (meth) acrylic acid, partially or fully neutralized with alkali,
wherein said powder or granule contains at least 75% by weight of chelating agent (A).

10. The powder or granule according to claim 9 having a residual moisture content in the range of from 1 to 20% by weight.

11. The granule according to claim 9 having an average diameter in the range of from 0.1 mm to 2 mm.

12. The powder or granule according to claim 9 , wherein chelating agent (A) is a combination of the disodium salt of MGDA and the trisodium salt of MGDA.

13. The powder or granule according to claim 9 , wherein the amount of compound (B) is in the range of from 50 to 2,500 ppm by weight, referring to chelating agent (A).

14. A method for the manufacture of a cleaning agent for fibers or hard surfaces comprising combining a granule or powder according to claim 9 and at least one bleaching agent, wherein said cleaning agent comprises at least one peroxy compound.

15. A cleaning agent containing comprising at least one peroxy compound and at least one powder or granule according to claim 9 .

16. The method according to claim 14 , wherein said at least one peroxy compound is selected from percarbonates, persulfates and/or perborates.

Assignees

• Basf Se

Inventors

• Reinoso Garcia Marta
• Haremza Sylke
• Gieshoff Tile
• Tang Dan-Tam Daniel
• Schmidt Thomas
• Mueller Michael Klemens

Classifications

• C11D3/3902

  combined with specific additives · CPC title

• C11D17/065

  High-density particulate detergent compositions · CPC title

• C11D7/3281

  Heterocyclic compounds · CPC title

• C11D17/06

  Powder; Flakes; Free-flowing mixtures; Sheets · CPC title

• C11D7/3245

  Aminoacids · CPC title