Purification of crude isophoronediamine by partial condensation in series with total condensation

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United States of America Patent

PATENT NO 10392340
APP PUB NO 20180029971A1
SERIAL NO

15642382

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Abstract

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The present invention is directed to a process for fine purification of isophoronediamine from the production of isophoronediamine wherein the crude isophoronediamine I is subjected to a fine purification by means of two vacuum distillation columns, wherein I. in the first vacuum distillation column K I low-boiling by-products still present are removed, and a crude IPDA II is transferred from the bottom of K I into the vacuum distillation column K II, II. and in the second vacuum distillation column K II the isophoronediamine is obtained in pure form overhead and separated from the organic residues, wherein the first condenser is a partial condenser and the pure IPDA is removed therein, and wherein the second condenser is a total condenser and the residual portion of the vapor stream from K II is completely condensed therein and recycled as return stream into the first vacuum distillation column K I.

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Patent Owner(s)

Patent OwnerAddress
EVONIK OPERATIONS GMBHRELLINGHAUSER STRASSE 1-11 ESSEN 45128

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Caßens, Jan Recklinghausen, DE 8 151
Hengstermann, Axel Senden, DE 17 224
Knoop, Cord Haltern am See, DE 5 70
Müller, Anja Dortmund, DE 3 20
Rüfer, Alexander Martin Recklinghausen, DE 13 120
Rittsteiger, Anne Olfen, DE 17 129

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