Method for preparing an amine hydrochloride suspension

US12151997B2 · kind B2 · utility

Assignee

• Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

• Michael Merkel · Hof, DE
• Tim Loddenkemper · Dormagen, DE
• Frank Gerhartz · Leverkusen, DE
• Stefan Hirschfeld · Alpen, DE

Key dates

• Filing date: May 5, 2023
• Grant date: Nov 26, 2024
• Expiry date: May 5, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/758
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for preparing a suspension of a hydrochloride of an organic amine, comprising the following steps of (i) initially charging at least one organic solvent in a reaction vessel to form a liquid level, (ii) adding hydrogen chloride, (iii) adding the organic amine, wherein the organic amine is added below the liquid level present in the reaction vessel and steps (ii) and (iii) are at least partly carried out simultaneously. Furthermore, the present invention also relates to a method wherein the suspension obtained after step (iii) is reacted in a step (iv) with phosgene to obtain the organic isocyanate corresponding to the organic amine used, to the corresponding organic isocyanate and to the use of the organic isocyanate for producing polyisocyanates.