A process for digesting wood
The application describes the disclosure that the delignification of carbohydrate-type material can be accomplished by treatment with gaseous mixtures of highly volatile primary and/or secondary amines and steam. The digestion takes place in the temperature range from 120 DEG C to 250 DEG C and in t...
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| creator | PETER,SIEGFRIED,DR BEER,REINER |
| description | The application describes the disclosure that the delignification of carbohydrate-type material can be accomplished by treatment with gaseous mixtures of highly volatile primary and/or secondary amines and steam. The digestion takes place in the temperature range from 120 DEG C to 250 DEG C and in the pressure range from 12 to 70 bar and, in the case of spruce wood being digested, already leads to residual lignin contents of about 1% by weight in the course of a treatment time of about 3 hours. In the digestion by the process according to the invention, products having a high steam volatility are formed. By letting down the gaseous reaction mixture to pressures from 1 to 10 bar and simultaneous cooling to temperatures from 20 DEG C to 120 DEG C, the resulting lignin degradation products are precipitated. Depending on the precipitation conditions, a 60 to 80% by weight aqueous solution of the degradation products is obtained. |
| format | Patent |
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The digestion takes place in the temperature range from 120 DEG C to 250 DEG C and in the pressure range from 12 to 70 bar and, in the case of spruce wood being digested, already leads to residual lignin contents of about 1% by weight in the course of a treatment time of about 3 hours. In the digestion by the process according to the invention, products having a high steam volatility are formed. By letting down the gaseous reaction mixture to pressures from 1 to 10 bar and simultaneous cooling to temperatures from 20 DEG C to 120 DEG C, the resulting lignin degradation products are precipitated. Depending on the precipitation conditions, a 60 to 80% by weight aqueous solution of the degradation products is obtained.</description><edition>4</edition><language>eng ; ger</language><subject>APPARATUS THEREFOR ; PAPER-MAKING ; PRODUCTION OF CELLULOSE ; PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS ; REGENERATION OF PULPING LIQUORS ; TEXTILES</subject><creationdate>1986</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=19860828&DB=EPODOC&CC=DE&NR=3506108A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25562,76317</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19860828&DB=EPODOC&CC=DE&NR=3506108A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>PETER,SIEGFRIED,DR</creatorcontrib><creatorcontrib>BEER,REINER</creatorcontrib><title>A process for digesting wood</title><description>The application describes the disclosure that the delignification of carbohydrate-type material can be accomplished by treatment with gaseous mixtures of highly volatile primary and/or secondary amines and steam. The digestion takes place in the temperature range from 120 DEG C to 250 DEG C and in the pressure range from 12 to 70 bar and, in the case of spruce wood being digested, already leads to residual lignin contents of about 1% by weight in the course of a treatment time of about 3 hours. In the digestion by the process according to the invention, products having a high steam volatility are formed. By letting down the gaseous reaction mixture to pressures from 1 to 10 bar and simultaneous cooling to temperatures from 20 DEG C to 120 DEG C, the resulting lignin degradation products are precipitated. Depending on the precipitation conditions, a 60 to 80% by weight aqueous solution of the degradation products is obtained.</description><subject>APPARATUS THEREFOR</subject><subject>PAPER-MAKING</subject><subject>PRODUCTION OF CELLULOSE</subject><subject>PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS</subject><subject>REGENERATION OF PULPING LIQUORS</subject><subject>TEXTILES</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1986</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZJBxVCgoyk9OLS5WSMsvUkjJTE8tLsnMS1coz89P4WFgTUvMKU7lhdLcDApuriHOHrqpBfnxqcUFicmpeakl8S6uxqYGZoYGFo6GxkQoAQA9SSL_</recordid><startdate>19860828</startdate><enddate>19860828</enddate><creator>PETER,SIEGFRIED,DR</creator><creator>BEER,REINER</creator><scope>EVB</scope></search><sort><creationdate>19860828</creationdate><title>A process for digesting wood</title><author>PETER,SIEGFRIED,DR ; BEER,REINER</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_DE3506108A13</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng ; ger</language><creationdate>1986</creationdate><topic>APPARATUS THEREFOR</topic><topic>PAPER-MAKING</topic><topic>PRODUCTION OF CELLULOSE</topic><topic>PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS</topic><topic>REGENERATION OF PULPING LIQUORS</topic><topic>TEXTILES</topic><toplevel>online_resources</toplevel><creatorcontrib>PETER,SIEGFRIED,DR</creatorcontrib><creatorcontrib>BEER,REINER</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>PETER,SIEGFRIED,DR</au><au>BEER,REINER</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>A process for digesting wood</title><date>1986-08-28</date><risdate>1986</risdate><abstract>The application describes the disclosure that the delignification of carbohydrate-type material can be accomplished by treatment with gaseous mixtures of highly volatile primary and/or secondary amines and steam. The digestion takes place in the temperature range from 120 DEG C to 250 DEG C and in the pressure range from 12 to 70 bar and, in the case of spruce wood being digested, already leads to residual lignin contents of about 1% by weight in the course of a treatment time of about 3 hours. In the digestion by the process according to the invention, products having a high steam volatility are formed. By letting down the gaseous reaction mixture to pressures from 1 to 10 bar and simultaneous cooling to temperatures from 20 DEG C to 120 DEG C, the resulting lignin degradation products are precipitated. Depending on the precipitation conditions, a 60 to 80% by weight aqueous solution of the degradation products is obtained.</abstract><edition>4</edition><oa>free_for_read</oa></addata></record> |
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| language | eng ; ger |
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| subjects | APPARATUS THEREFOR PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES |
| title | A process for digesting wood |
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