Preparation method of 2-hydroxy-4-aminobenzoic acid
The invention discloses a preparation method of 2-hydroxy-4-aminobenzoic acid. The preparation method comprises the following steps that 1, m-aminophenol and a sodium alkoxide undergo a reaction in an alcoholic solution at room temperature for 0.8 to 1.2 hours to produce an m-aminophenol sodium salt...
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| creator | MO MANMAN LIU HUAGUO FAN FENGJIAO |
| description | The invention discloses a preparation method of 2-hydroxy-4-aminobenzoic acid. The preparation method comprises the following steps that 1, m-aminophenol and a sodium alkoxide undergo a reaction in an alcoholic solution at room temperature for 0.8 to 1.2 hours to produce an m-aminophenol sodium salt alcoholic solution; and 2, the m-aminophenol sodium salt alcoholic solution is putted into a high-pressure reactor; carbon dioxide recovery gas is fed into the high-pressure reactor to undergo a reaction for 1 to 5 hours under supercritical conditions of carbon dioxide; after the reaction, the obtained reaction solution is cooled to room temperature and then is filtered; the filtrate is subjected to reduced pressure distillation so that a solvent alcohol is removed and a solid is obtained; the solid is dissolved by water to form a solution; an inorganic acid is added into the solution to adjust a pH value of the solution to a pH value of 6 to 7; and when a solid is separated out, the solution is filtered again to |
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The preparation method comprises the following steps that 1, m-aminophenol and a sodium alkoxide undergo a reaction in an alcoholic solution at room temperature for 0.8 to 1.2 hours to produce an m-aminophenol sodium salt alcoholic solution; and 2, the m-aminophenol sodium salt alcoholic solution is putted into a high-pressure reactor; carbon dioxide recovery gas is fed into the high-pressure reactor to undergo a reaction for 1 to 5 hours under supercritical conditions of carbon dioxide; after the reaction, the obtained reaction solution is cooled to room temperature and then is filtered; the filtrate is subjected to reduced pressure distillation so that a solvent alcohol is removed and a solid is obtained; the solid is dissolved by water to form a solution; an inorganic acid is added into the solution to adjust a pH value of the solution to a pH value of 6 to 7; and when a solid is separated out, the solution is filtered again to</description><language>chi ; eng</language><subject>ACYCLIC OR CARBOCYCLIC COMPOUNDS ; CHEMISTRY ; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS ; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC ; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS ; METALLURGY ; ORGANIC CHEMISTRY ; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE</subject><creationdate>2012</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20120111&DB=EPODOC&CC=CN&NR=102311357A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25563,76318</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20120111&DB=EPODOC&CC=CN&NR=102311357A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>MO MANMAN</creatorcontrib><creatorcontrib>LIU HUAGUO</creatorcontrib><creatorcontrib>FAN FENGJIAO</creatorcontrib><title>Preparation method of 2-hydroxy-4-aminobenzoic acid</title><description>The invention discloses a preparation method of 2-hydroxy-4-aminobenzoic acid. 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| language | chi ; eng |
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| subjects | ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY ORGANIC CHEMISTRY TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE |
| title | Preparation method of 2-hydroxy-4-aminobenzoic acid |
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