Granules of MGDA and (meth)acrylic acid homo- or co-polymer; process for making the same

US12415971B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Michael Schoenherr · Wausau, US
• Kati Schmidt · Shanghai, CN
• Johannes Felix HAUS · Ludwigshafen, DE
• Michael Klemens MUELLER · Ludwigshafen, DE
• Frank Jaekel · Ludwigshafen, DE
• Marta Reinoso Garcia · Dossenheim, DE
• Volker Klock · Ludwigshafen, DE

Key dates

• Filing date: Dec 1, 2020
• Grant date: Sep 16, 2025
• Expiry date: Aug 10, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D11/02
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for making a granule containing (A) at least one chelating agent selected from alkali metal salts of methyl glycine diacetic acid (MGDA) and of iminodisuccinic acid (IDS), and, optionally, (B) at least one homo- or copolymer of (meth) acrylic acid, partially or fully neutralized with alkali, the process including the steps of (a) providing an aqueous solution or slurry containing chelating agent (A) and, if applicable, (co) polymer (B), (b) removing most of the water by spray granulation in a fluidized bed, (c) treating the resultant granule in a vessel of which at least one part rotates around a horizontal axis and wherein the vessel is selected from paddle mixers, free-fall mixers and plough share mixers.