# US 11,897,909 B2 · Methods for the purification of L-glufosinate

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,897,909 B2
- Document ID: US11897909B2
- Status: Granted
- Kind: B2
- Application number: 18/180,724
- Filed: 2023-03-08
- Published: 2023-07-13
- Granted: 2024-02-13
- Earliest claimed: 2017-07-18
- Assignees: BASF SE
- Applicants: BASF SE
- Inventors: Stephen Craig Fields; Matthew Richard Oberholzer; Brian Michael Green; Samir Kulkarni; Jennifer Nelson; Patricia Andres
- Web page: https://patentgrep.com/patent/US11897909B2

## CPC

- B01D 15/361: {Ion-exchange}
- A01N 57/20: containing acyclic or cycloaliphatic radicals
- B01D 15/1821: {Simulated moving beds}
- C07F 9/301: {Acyclic saturated acids which can have further substituents on alkyl}
- C07F 9/535: Organo-phosphoranes
- B01D 15/34: Size-selective separation, e.g. size-exclusion chromatography; Gel filtration; Permeation
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

Solid forms of L-glufosinate materials, including crystalline L-glufosinate ammonium, are described.

## Claims

### Claim 1

An L-Glufosinate crystalline form, the crystalline form characterized by an X-ray powder diffraction (XRPD) pattern comprising at least three peaks selected from 9.1, 11.6, 13.1, 14.1, 14.4, 16.2, 17.7, 18.2, 18.9, 19.3, 19.7, 21.2, 21.8, 22.4, 23.2, 23.5, 25.3, 25.8, 26.2, 27.2, 28.6, 29.1, 30.0, 30.6, 31.1, 31.6, 32.7, 33.5, 34.4, 34.7, 35.4, 35.9, 36.4, and 37.4 °2θ, ±0.2 °2θ, as determined on a diffractometer using Cu-Kα radiation, wherein the XRPD pattern comprises at least one peak at 9.1, 11.6, or 13.1 °2θ, ±0.2 °2θ, as determined on a diffractometer using Cu-Kα radiation.

### Claim 2 (depends on 1)

The L-Glufosinate crystalline form according to claim 1, wherein the XRPD pattern comprises at least six peaks selected from 9.1, 17.7, 18.2, 18.9, 22.4, 23.2, 23.5, 26.2, 33.5, and 36.4 °2θ, ±0.2 °2θ.

### Claim 3 (depends on 1)

The L-Glufosinate crystalline form according to claim 1, wherein the XRPD pattern comprises peaks at 9.1, 17.7, 18.2, 18.9, 22.4, 23.2, 23.5, 26.2, 33.5, and 36.4 °2θ, ±0.2 °2θ.

### Claim 4 (depends on 1)

The L-Glufosinate crystalline form according to claim 1, wherein the form has the XRPD pattern of FIG. 7.