Process for manufacture of isophorone diamines

Through the design of the two-stage hydrogenation reactor system and recirculation flow, the IPDA production problem with high yield and high CTR is solved, and efficient separation of nitrile by-products is achieved, which improves production efficiency and product quality.

CN120303241APending Publication Date: 2025-07-11BASF SE
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Patent Information

Application Number
CN202380082871.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2022-12-02
Filing Date
2023-11-23
Publication Date
2025-07-11

AI Technical Summary

Technical Problem

The prior art is difficult to achieve the production of isophorone diamine (IPDA) with high yield and high cis-trans-isomer ratio (CTR) simultaneously, and there is a problem that nitrile by-products are difficult to separate.

Method used

Using a two-stage hydrogenation reactor system, the first hydrogenation reactor operates at a higher cross-sectional load, the second hydrogenation reactor operates at a lower cross-sectional load, and returns a portion of the effluent to the first reactor through a recirculation stream, in combination with the use of alkaline compounds to control the temperature and increase the conversion rate.

Benefits of technology

Increases the yield and cis-trans-isomer ratio (CTR) of IPDA, reduces the formation of nitrile by-products, and reduces energy consumption and equipment size.

✦ Generated by Eureka AI based on patent content.

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Abstract

Disclosed is a process for producing IPDA by hydrogenating IPNI and / or IPN, the process comprising the steps of: a) feeding a stream comprising IPNI and / or IPN to a first hydrogenation reactor or a first series of hydrogenation reactors, b) feeding at least a portion of the effluent from the first hydrogenation or first series of hydrogenation reactors to a second hydrogenation or second series of hydrogenation reactors, and c) recycling at least a portion of the effluent from the first hydrogenation reactor or the first series of hydrogenation reactors to the first hydrogenation reactor or the first series of hydrogenation reactors.
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Citation Information

Patent Citations

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    DE10236674A1

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