Invention Grant
- Patent Title: Process for making a crystalline alkali metal salt of a complexing agent, and crystalline complexing agent
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Application No.: US16061007Application Date: 2016-12-07
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Publication No.: US10421711B2Publication Date: 2019-09-24
- Inventor: Constanze Franzke , Axel Franzke , Armin Stamm , Markus Hartmann , Robert Baumann
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen am Rhein
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen am Rhein
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: EP15200850 20151217
- International Application: PCT/EP2016/080001 WO 20161207
- International Announcement: WO2017/102483 WO 20170622
- Main IPC: C07C227/10
- IPC: C07C227/10 ; C07C227/18 ; C07C227/42 ; C07C227/02 ; C07C229/36 ; C11D3/33
Abstract:
Process for manufacturing a crystalline alkali metal salt of the general formula (I) [R1—CH(COO)—N(CH2—COO)2]M13 (I) wherein M1 is selected from alkali metal cations, same or different, R1 is selected from C1-C4-alkyl and CH2CH2COOM1, comprising the step of (b) crystallizing said alkali metal salt from an aqueous solution containing in the range of from 5 to 30% by weight of alkali metal hydroxide, referring to said aqueous solution.
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