FACILITY AND METHOD FOR PURIFYING RECOVERED NMP
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United States of America Patent
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Issued Date -
Jul 18, 2024
app pub date -
May 16, 2022
filing date -
May 21, 2021
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Abstract
The present invention relates to a facility for purifying recovered NMP from lithium-ion battery production, comprising a first column for separating low-boiling impurities, comprising a supply, in its central part, for the recovered NMP, and which can be heated by means of a first evaporator for supplying thermal energy; and a second column for separating high-boiling impurities, a connection line from a lower part of the first column to a lower part of the second column being provided. In this case, according to the invention, the second column can be heated by means of a second evaporator comprising an inlet and an outlet for purified NMP, and the second column is assigned a compressor portion which extends from a head of the second column to the inlet of the second evaporator and comprises a mechanical vapor compressor for inputting energy to the vapor of the second column. The present invention furthermore relates to a method for operating a facility of this kind.
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