Process for the production of high purity melamine from urea
The present invention concerns process for obtaining melamine at high purity characterized by comprising the steps of: - quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solut...
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| creator | SIOLI GIANCARLO |
| description | The present invention concerns process for obtaining melamine at high purity characterized by comprising the steps of:
- quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solution comprising ammonia under conditions such to substantially convert polycondensates into melamine, obtaining a melamine solution substantially free of polycondensates,
- recovering melamine from said melamine solution by melamine crystallisation, obtaining melamine crystals and a melamine crystallization mother liquor,
- treating said crystallization melamine mother liquor under conditions such to convert at least a portion of its ammeline content into ammelide and melammine, obtaining a treated mother liquid having at least a reduced ammeline content. The invention also concerns a high-pressure non-catalytic plant for the production of high-purity melamine implementing the above process and apparatuses suitable to be used in this plant. |
| format | Patent |
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- quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solution comprising ammonia under conditions such to substantially convert polycondensates into melamine, obtaining a melamine solution substantially free of polycondensates,
- recovering melamine from said melamine solution by melamine crystallisation, obtaining melamine crystals and a melamine crystallization mother liquor,
- treating said crystallization melamine mother liquor under conditions such to convert at least a portion of its ammeline content into ammelide and melammine, obtaining a treated mother liquid having at least a reduced ammeline content. The invention also concerns a high-pressure non-catalytic plant for the production of high-purity melamine implementing the above process and apparatuses suitable to be used in this plant.</description><language>eng</language><subject>CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY ; CHEMISTRY ; HETEROCYCLIC COMPOUNDS ; METALLURGY ; ORGANIC CHEMISTRY ; PERFORMING OPERATIONS ; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL ; THEIR RELEVANT APPARATUS ; TRANSPORTING</subject><creationdate>2015</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=20150114&DB=EPODOC&CC=CN&NR=102850286B$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25543,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20150114&DB=EPODOC&CC=CN&NR=102850286B$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SIOLI GIANCARLO</creatorcontrib><title>Process for the production of high purity melamine from urea</title><description>The present invention concerns process for obtaining melamine at high purity characterized by comprising the steps of:
- quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solution comprising ammonia under conditions such to substantially convert polycondensates into melamine, obtaining a melamine solution substantially free of polycondensates,
- recovering melamine from said melamine solution by melamine crystallisation, obtaining melamine crystals and a melamine crystallization mother liquor,
- treating said crystallization melamine mother liquor under conditions such to convert at least a portion of its ammeline content into ammelide and melammine, obtaining a treated mother liquid having at least a reduced ammeline content. The invention also concerns a high-pressure non-catalytic plant for the production of high-purity melamine implementing the above process and apparatuses suitable to be used in this plant.</description><subject>CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY</subject><subject>CHEMISTRY</subject><subject>HETEROCYCLIC COMPOUNDS</subject><subject>METALLURGY</subject><subject>ORGANIC CHEMISTRY</subject><subject>PERFORMING OPERATIONS</subject><subject>PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL</subject><subject>THEIR RELEVANT APPARATUS</subject><subject>TRANSPORTING</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2015</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZLAJKMpPTi0uVkjLL1IoyUhVKCjKTylNLsnMz1PIT1PIyEzPUCgoLcosqVTITc1JzM3MS1VIK8rPVSgtSk3kYWBNS8wpTuWF0twMSm6uIc4euqkF-fGpxQWJyal5qSXxzn6GBkYWpkBs5uRkTJQiAEF0MEQ</recordid><startdate>20150114</startdate><enddate>20150114</enddate><creator>SIOLI GIANCARLO</creator><scope>EVB</scope></search><sort><creationdate>20150114</creationdate><title>Process for the production of high purity melamine from urea</title><author>SIOLI GIANCARLO</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_CN102850286BB3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2015</creationdate><topic>CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY</topic><topic>CHEMISTRY</topic><topic>HETEROCYCLIC COMPOUNDS</topic><topic>METALLURGY</topic><topic>ORGANIC CHEMISTRY</topic><topic>PERFORMING OPERATIONS</topic><topic>PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL</topic><topic>THEIR RELEVANT APPARATUS</topic><topic>TRANSPORTING</topic><toplevel>online_resources</toplevel><creatorcontrib>SIOLI GIANCARLO</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>SIOLI GIANCARLO</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Process for the production of high purity melamine from urea</title><date>2015-01-14</date><risdate>2015</risdate><abstract>The present invention concerns process for obtaining melamine at high purity characterized by comprising the steps of:
- quenching a melamine melt, deprived of off-gases of the melamine synthesis and containing melamine impurities such as ammeline, ammelide and polycondensates, with an aqueous solution comprising ammonia under conditions such to substantially convert polycondensates into melamine, obtaining a melamine solution substantially free of polycondensates,
- recovering melamine from said melamine solution by melamine crystallisation, obtaining melamine crystals and a melamine crystallization mother liquor,
- treating said crystallization melamine mother liquor under conditions such to convert at least a portion of its ammeline content into ammelide and melammine, obtaining a treated mother liquid having at least a reduced ammeline content. The invention also concerns a high-pressure non-catalytic plant for the production of high-purity melamine implementing the above process and apparatuses suitable to be used in this plant.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY HETEROCYCLIC COMPOUNDS METALLURGY ORGANIC CHEMISTRY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING |
| title | Process for the production of high purity melamine from urea |
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