Method for cleaning aqueous wastewater streams loaded with nitrobenzene

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12129187
APP PUB NO 20230234859A1
SERIAL NO

17996954

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Abstract

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A process for purifying nitrobenzene-contaminated wastewater stream WW1 includes stripping WW1 with stripping gas SG1 in a stripping column to obtain wastewater stream WW2 containing reduced concentration of nitrobenzene relative to WW1 (cNB,WW2), and purifying WW2 in a wastewater treatment plant, wherein a target value (cNB,WW2,TARGET) is specified for the nitrobenzene concentration in WW2. A set of linear mathematical relationships is stored in a database for a combination of boundary conditions of nitrobenzene concentration in WW1, temperature of WW1, and temperature of SG1. This set defines a range of concentrations of nitrobenzene in WW2 and includes a mathematical relationship corresponding to cNB,WW2,TARGET, a mathematical relationship for a value of cNB,WW2 corresponding to 98% of cNB,WW2,TARGET, and a linear mathematical relationship for a value of cNB,WW2 corresponding to 102% of cNB,WW2,TARGET. The concentration of nitrobenzene is controlled in WW2 (cNB,WW2) by adjusting the flow rate of SG1.

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Patent Owner(s)

Patent OwnerAddress
COVESTRO DEUTSCHLAND AG51373 LEVERKUSEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Drinda, Peter Krefeld, DE 5 24
Pilarczyk, Klaus Krefeld, DE 2 19
Rosin, Thomas Duisburg, DE 3 22

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