A process for preparing fertilizers
A process for preparing a fertilizer, releasing nitrogen slowly, containing ureaform and at least one other fertilizing substance, comprises:(a) reacting urea and formaldehyde in an aqueous phase at a temperature from 30° to 60°C, at molar ratios or urea/ formaldehyde from 1.2 to 2 and water/urea fr...
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| creator | MONALDI, REMO FORTIBUONI, RAFFAELLO |
| description | A process for preparing a fertilizer, releasing nitrogen slowly, containing ureaform and at least one other fertilizing substance, comprises:(a) reacting urea and formaldehyde in an aqueous phase at a temperature from 30° to 60°C, at molar ratios or urea/ formaldehyde from 1.2 to 2 and water/urea from 0.7 to 10, at a pH from 2 to 4, by addition of an acid substance;(b) mixing the thus obtained ureaform aqueous suspension with at least one other fertilizing substance and with a part of the recycled final product, which part is sufficient to ensure in the mixture a pH from 0.4 to 5.5, and granulating the mixture at a temperature from 50° to 85°C;(c) before the granulation ends, increasing the product pH to a value from 5.8 to 7 by addition of an alkaline substance; and(d) drying the product, and recycling a part thereof to the step (b). |
| format | Patent |
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and(d) drying the product, and recycling a part thereof to the step (b).</description><language>eng ; fre ; ger</language><subject>CHEMISTRY ; FERTILISERS ; MANUFACTURE THEREOF ; METALLURGY ; NITROGENOUS FERTILISERS</subject><creationdate>1983</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=19831207&DB=EPODOC&CC=EP&NR=0095913A2$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25563,76318</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19831207&DB=EPODOC&CC=EP&NR=0095913A2$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>MONALDI, REMO</creatorcontrib><creatorcontrib>FORTIBUONI, RAFFAELLO</creatorcontrib><title>A process for preparing fertilizers</title><description>A process for preparing a fertilizer, releasing nitrogen slowly, containing ureaform and at least one other fertilizing substance, comprises:(a) reacting urea and formaldehyde in an aqueous phase at a temperature from 30° to 60°C, at molar ratios or urea/ formaldehyde from 1.2 to 2 and water/urea from 0.7 to 10, at a pH from 2 to 4, by addition of an acid substance;(b) mixing the thus obtained ureaform aqueous suspension with at least one other fertilizing substance and with a part of the recycled final product, which part is sufficient to ensure in the mixture a pH from 0.4 to 5.5, and granulating the mixture at a temperature from 50° to 85°C;(c) before the granulation ends, increasing the product pH to a value from 5.8 to 7 by addition of an alkaline substance; and(d) drying the product, and recycling a part thereof to the step (b).</description><subject>CHEMISTRY</subject><subject>FERTILISERS</subject><subject>MANUFACTURE THEREOF</subject><subject>METALLURGY</subject><subject>NITROGENOUS FERTILISERS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1983</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZFB2VCgoyk9OLS5WSMsvArJTCxKLMvPSFdJSi0oyczKrUouKeRhY0xJzilN5oTQ3g4Kba4izh25qQX58anFBYnJqXmpJvGuAgYGlqaWhsaORMRFKAJ5tJiw</recordid><startdate>19831207</startdate><enddate>19831207</enddate><creator>MONALDI, REMO</creator><creator>FORTIBUONI, RAFFAELLO</creator><scope>EVB</scope></search><sort><creationdate>19831207</creationdate><title>A process for preparing fertilizers</title><author>MONALDI, REMO ; FORTIBUONI, RAFFAELLO</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_EP0095913A23</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng ; fre ; ger</language><creationdate>1983</creationdate><topic>CHEMISTRY</topic><topic>FERTILISERS</topic><topic>MANUFACTURE THEREOF</topic><topic>METALLURGY</topic><topic>NITROGENOUS FERTILISERS</topic><toplevel>online_resources</toplevel><creatorcontrib>MONALDI, REMO</creatorcontrib><creatorcontrib>FORTIBUONI, RAFFAELLO</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>MONALDI, REMO</au><au>FORTIBUONI, RAFFAELLO</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>A process for preparing fertilizers</title><date>1983-12-07</date><risdate>1983</risdate><abstract>A process for preparing a fertilizer, releasing nitrogen slowly, containing ureaform and at least one other fertilizing substance, comprises:(a) reacting urea and formaldehyde in an aqueous phase at a temperature from 30° to 60°C, at molar ratios or urea/ formaldehyde from 1.2 to 2 and water/urea from 0.7 to 10, at a pH from 2 to 4, by addition of an acid substance;(b) mixing the thus obtained ureaform aqueous suspension with at least one other fertilizing substance and with a part of the recycled final product, which part is sufficient to ensure in the mixture a pH from 0.4 to 5.5, and granulating the mixture at a temperature from 50° to 85°C;(c) before the granulation ends, increasing the product pH to a value from 5.8 to 7 by addition of an alkaline substance; and(d) drying the product, and recycling a part thereof to the step (b).</abstract><oa>free_for_read</oa></addata></record> |
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| language | eng ; fre ; ger |
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| subjects | CHEMISTRY FERTILISERS MANUFACTURE THEREOF METALLURGY NITROGENOUS FERTILISERS |
| title | A process for preparing fertilizers |
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