Patent · US Active

Process for producing crystalline DTPMP

US10590153B2 · kind B2 · utility

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2References

11Claims

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Assignee

Zschimmer & Schwarz Mohsdorf GmbH & Co. KG · DE

Inventors

Thomas Kreher · Gröblitz, DE
Stephan Liebsch · Gößnitz, DE
Carsten Rudolph · Krailling, DE

Key dates

Filing date	Jun 2, 2015
Grant date	Mar 17, 2020
Priority date	—
Expiry date	Jun 2, 2035

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F9/3873
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to crystallizates of the pure aminoalkylenephosphonic acid DTPMP in three crystal polymorphs and to a process for obtaining solid crystalline DTPMP by a preferably one-stage crystallization from an aqueous product mixture comprising DTPMP, wherein the process comprises the following process steps: (a) introducing seed crystals comprising DTPMP into an aqueous crude product comprising DTPMP with a total proportion in the range from 10 to 65 percent by mass up to a suspension density in the range from 1% to 25%; (b) introducing kinetic energy into the aqueous crude product to precipitate a crystallizate containing DTPMP as pure acid with a total content of at least 75% by mass; and (c) removing the crystallizate formed from the aqueous crude product by sedimentation and/or filtration, such that DTPMP is obtained as a solid end product in the form of a crystallizate.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.