Method for purifying sodium sulfate residue
A method is provided for purifying a sodium sulfate residue comprising sodium sulfate, sodium carbonate, and sodium chloride, and optionally insoluble substances. The method comprises: (a) dissolving the residue with a first aqueous solution to obtain a first aqueous suspension comprising at least 5...
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| creator | BEADLE STEPHEN WOOD MATTHEW CRIADO, CLAUDIO WANG AIPING WANG YAN |
| description | A method is provided for purifying a sodium sulfate residue comprising sodium sulfate, sodium carbonate, and sodium chloride, and optionally insoluble substances. The method comprises: (a) dissolving the residue with a first aqueous solution to obtain a first aqueous suspension comprising at least 5 wt% and at most 32 wt% sodium sulfate; (b) optionally separating the insoluble substance from the first aqueous suspension to obtain separated insoluble substance and a second aqueous solution; (c1) acidifying the second aqueous solution with sulfuric acid to a pH of less than 6 in order to convert at least a portion or all of the dissolved sodium carbonate to sodium sulfate; (c2) optionally aerating the acidified second aqueous solution with oxygen or air to convert the sulfite to sulfate; (c3) alkalifying the acidified second aqueous solution with a base to a pH of about 7 or greater; (d) removing a portion of the water from the second aqueous solution to obtain a mother liquor and crystallizing the sodium sulfa |
| format | Patent |
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The method comprises: (a) dissolving the residue with a first aqueous solution to obtain a first aqueous suspension comprising at least 5 wt% and at most 32 wt% sodium sulfate; (b) optionally separating the insoluble substance from the first aqueous suspension to obtain separated insoluble substance and a second aqueous solution; (c1) acidifying the second aqueous solution with sulfuric acid to a pH of less than 6 in order to convert at least a portion or all of the dissolved sodium carbonate to sodium sulfate; (c2) optionally aerating the acidified second aqueous solution with oxygen or air to convert the sulfite to sulfate; (c3) alkalifying the acidified second aqueous solution with a base to a pH of about 7 or greater; (d) removing a portion of the water from the second aqueous solution to obtain a mother liquor and crystallizing the sodium sulfa</description><language>chi ; eng</language><subject>CHEMISTRY ; COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM ; INORGANIC CHEMISTRY ; METALLURGY</subject><creationdate>2024</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=20240102&DB=EPODOC&CC=CN&NR=117326574A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20240102&DB=EPODOC&CC=CN&NR=117326574A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>BEADLE STEPHEN</creatorcontrib><creatorcontrib>WOOD MATTHEW</creatorcontrib><creatorcontrib>CRIADO, CLAUDIO</creatorcontrib><creatorcontrib>WANG AIPING</creatorcontrib><creatorcontrib>WANG YAN</creatorcontrib><title>Method for purifying sodium sulfate residue</title><description>A method is provided for purifying a sodium sulfate residue comprising sodium sulfate, sodium carbonate, and sodium chloride, and optionally insoluble substances. 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| language | chi ; eng |
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| subjects | CHEMISTRY COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM INORGANIC CHEMISTRY METALLURGY |
| title | Method for purifying sodium sulfate residue |
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