Procédé de nettoyage d'un appareil portant un dépôt d'acide maléique brut et de goudrons

A process for removing a solid deposit of crude maleic acid and tars, formed during the production of maleic anhydride by the partial catalytic oxidation of benzene, from apparatus in which the deposit has formed comprises contacting the deposit with at least sufficient molten maleic anhydride to di...

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Hauptverfasser: L. RUSSELL,JOSEPH, B. FEDER,JACK
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B. FEDER,JACK
description A process for removing a solid deposit of crude maleic acid and tars, formed during the production of maleic anhydride by the partial catalytic oxidation of benzene, from apparatus in which the deposit has formed comprises contacting the deposit with at least sufficient molten maleic anhydride to dissolve the deposit and draining off the resulting solution. The removal of the deposit may be carried out simultaneously with the flow of the hot gaseous reaction mixture through the apparatus or may be carried out on apparatus which has been removed from service. The gaseous mixture resulting from the catalytic oxidation may be partially condensed to give liquid maleic anhydride and slow formation of the solid deposit, the uncondensed vapours being passed to a water scrubber where any maleic anhydride present is hydrolysed to maleic acid which is subsequently dehydrated to maleic anhydride. Examples are given. Specification 853,849 is referred to.
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The gaseous mixture resulting from the catalytic oxidation may be partially condensed to give liquid maleic anhydride and slow formation of the solid deposit, the uncondensed vapours being passed to a water scrubber where any maleic anhydride present is hydrolysed to maleic acid which is subsequently dehydrated to maleic anhydride. Examples are given. 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The removal of the deposit may be carried out simultaneously with the flow of the hot gaseous reaction mixture through the apparatus or may be carried out on apparatus which has been removed from service. The gaseous mixture resulting from the catalytic oxidation may be partially condensed to give liquid maleic anhydride and slow formation of the solid deposit, the uncondensed vapours being passed to a water scrubber where any maleic anhydride present is hydrolysed to maleic acid which is subsequently dehydrated to maleic anhydride. Examples are given. Specification 853,849 is referred to.</abstract><edition>1</edition><oa>free_for_read</oa></addata></record>
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subjects ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
title Procédé de nettoyage d'un appareil portant un dépôt d'acide maléique brut et de goudrons
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