PROCEDIMENTO PER LA PRODUZIONE DI ARTICOLI DI CELLULOSA RIGENERATA CON RICUPERO DEI SOLVENTI
A process for producing regenerated cellulosic articles from cellulose which has been dissolved in a mixture of dimethyl sulfoxide (DMSO) and formaldehyde, and for recovering the solvent chemicals. The DMSO/formaldehyde solution of cellulose is brought into contact with an aqueous solution, the pH o...
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| creator | MARTTI ALKIO OLLI AALTONEN |
| description | A process for producing regenerated cellulosic articles from cellulose which has been dissolved in a mixture of dimethyl sulfoxide (DMSO) and formaldehyde, and for recovering the solvent chemicals. The DMSO/formaldehyde solution of cellulose is brought into contact with an aqueous solution, the pH of which is at least 9 and the adjustment of pH has been carried out by means of a base or an alkaline salt which does not react with formaldehyde and the content of which is at most 0.1% by weight, so that the product is coagulated and regenerated in the desired form, such as fibres, films or shaped articles. The coagulation solution is evaporated in one stage or plurality of stages so that the DMSO and formaldehyde of the cellulose solution remain in the evaporation residue. The evaporation residue is recycled for the production of cellulose solution, purified, if so required. |
| format | Patent |
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The DMSO/formaldehyde solution of cellulose is brought into contact with an aqueous solution, the pH of which is at least 9 and the adjustment of pH has been carried out by means of a base or an alkaline salt which does not react with formaldehyde and the content of which is at most 0.1% by weight, so that the product is coagulated and regenerated in the desired form, such as fibres, films or shaped articles. The coagulation solution is evaporated in one stage or plurality of stages so that the DMSO and formaldehyde of the cellulose solution remain in the evaporation residue. The evaporation residue is recycled for the production of cellulose solution, purified, if so required.</description><edition>3</edition><language>ita</language><subject>APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS ; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS ; CHEMISTRY ; COMPOSITIONS BASED THEREON ; DERIVATIVES THEREOF ; METALLURGY ; NATURAL OR ARTIFICIAL THREADS OR FIBRES ; ORGANIC MACROMOLECULAR COMPOUNDS ; POLYSACCHARIDES ; SPINNING ; TEXTILES ; THEIR PREPARATION OR CHEMICAL WORKING-UP</subject><creationdate>1981</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=19810327&DB=EPODOC&CC=IT&NR=8167429A0$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19810327&DB=EPODOC&CC=IT&NR=8167429A0$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>MARTTI ALKIO</creatorcontrib><creatorcontrib>OLLI AALTONEN</creatorcontrib><title>PROCEDIMENTO PER LA PRODUZIONE DI ARTICOLI DI CELLULOSA RIGENERATA CON RICUPERO DEI SOLVENTI</title><description>A process for producing regenerated cellulosic articles from cellulose which has been dissolved in a mixture of dimethyl sulfoxide (DMSO) and formaldehyde, and for recovering the solvent chemicals. 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The DMSO/formaldehyde solution of cellulose is brought into contact with an aqueous solution, the pH of which is at least 9 and the adjustment of pH has been carried out by means of a base or an alkaline salt which does not react with formaldehyde and the content of which is at most 0.1% by weight, so that the product is coagulated and regenerated in the desired form, such as fibres, films or shaped articles. The coagulation solution is evaporated in one stage or plurality of stages so that the DMSO and formaldehyde of the cellulose solution remain in the evaporation residue. The evaporation residue is recycled for the production of cellulose solution, purified, if so required.</abstract><edition>3</edition><oa>free_for_read</oa></addata></record> |
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| subjects | APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMISTRY COMPOSITIONS BASED THEREON DERIVATIVES THEREOF METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS POLYSACCHARIDES SPINNING TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP |
| title | PROCEDIMENTO PER LA PRODUZIONE DI ARTICOLI DI CELLULOSA RIGENERATA CON RICUPERO DEI SOLVENTI |
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