JP5002458B2 - リグニンを黒色液から分離する方法 - Google Patents
リグニンを黒色液から分離する方法 Download PDFInfo
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- JP5002458B2 JP5002458B2 JP2007531127A JP2007531127A JP5002458B2 JP 5002458 B2 JP5002458 B2 JP 5002458B2 JP 2007531127 A JP2007531127 A JP 2007531127A JP 2007531127 A JP2007531127 A JP 2007531127A JP 5002458 B2 JP5002458 B2 JP 5002458B2
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- lignin
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- filter cake
- dehydration
- black liquor
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0007—Recovery of by-products, i.e. compounds other than those necessary for pulping, for multiple uses or not otherwise provided for
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Description
としてもたらされたリグニンは、ある場合には、「高純度」(燃料で用いるに適するに充分なほどクリーン)であったが、濾過ケーキが詰まり(blocking)を起こすと言った比較的大きな問題が生じた。いくつかの試験では洗浄水の流量が低下してほとんどゼロになった。他の試験では、濾過ケーキの不均一な洗浄が起こり、これは結果として、リグニン中の無機物質(主にナトリウム)の濃度が高いことを伴った。そのような濾過ケーキが示すpHをできるだけ迅速に低下させる目的で高酸性度(pH=1)の洗浄水を用いた洗浄を実施することでそのような問題を軽減することができることを本実験を実施している過程中に見いだした。しかしながら、そのような手順を産業規模で用いると酸の消費量が非常に多くなり、従って、そのような手順はあまり効率が良くない。
本発明は、1番目の面に従って、燃料としてか或は化学品の製造で使用可能でありかつ灰含有量が妥当に低くかつ腐食をもたらす傾向が低い本質的に高純度のリグニン製品が得られるようにリグニンを黒色液から少量の酸を用いて分離する方法を提供することで、この上に示した問題の中の1つ以上を解決するものであり、この方法は下記の段階:
a)黒色液(これ自身はリグニン懸濁液である)を酸性にすることでリグニンを沈澱させた後ただちに(thereupon)、脱水を実施し、
b)そのリグニン濾過ケーキを懸濁させることで2番目のリグニン懸濁液を得、そしてpHレベルをおおよそ以下に示す段階d)の洗浄水が示すpHレベルに調整し、
c)前記2番目のリグニン懸濁液の脱水を実施し、
d)洗浄水を添加しそして置換洗浄をpHの劇的な変化を伴わせることなく多少とも一定した条件下で実施し、そして
e)段階d)でもたらされた濾過ケーキの脱水を実施して高度に乾燥させかつ前記濾過ケーキに残存していた洗浄液を追い出すことで、段階d)の置換洗浄後に更により高い乾燥度を示すリグニン生成物を得る、
段階を含んで成る。
本説明の全体に渡って、表現「酸性化」は黒色液を酸性にする如何なる手段も包含することを意図する。そのような酸性化を好適にはSO2(気体)、有機酸、HCl、HNO3、二酸化炭素または硫酸(新鮮な硫酸または二酸化塩素発生装置に由来するいわゆる「使用済み酸」の形態)またはこれらの混合物を前記黒色液に添加、最も好適には二酸化炭素または硫酸を添加することで実施する。
[実施例]
この上の背景に示した如き以前から公知の技術に従ってリグニンを分離する実験室試験において、酸性化(二酸化炭素または硫酸を用いた)によってリグニンを黒色液から沈澱させた。その得た懸濁液を濾過した後、置換洗浄を実施して、洗浄水を濾過ケーキの上部に加えた後、それに圧力をかけることで圧縮した。その結果として、ある場合には、「高純度」(燃料で用いるに適するに充分なほどクリーンな)リグニンがもたらされはしたが、濾過ケーキが詰まりを起こしたことでかなり大きな問題が生じた。ある試験では洗浄水の流量がほとんどゼロにまで低下した。他の試験では、結果としてリグニン中の無機物質(主にナトリウム)の濃度が高いことで濾過ケーキの洗浄が均一には起こらなかった。
文献:
Aarsrud W.、Bergstroem H.およびFalkehag I(1990):「A lignin preparation and a method for its manufacture」、WO 9006964
Tomlinson och Tomlinson Jr.(1994):「Improvements in the Recovery of Lignin from Black Liquor」、米国特許第664811号
Claims (10)
- リグニンを黒色液から分離する方法であって、下記の段階:
a)黒色液を酸性にすることでリグニンを沈澱させた後、脱水を実施し、
b) 段階a)で得たリグニン濾過ケーキを懸濁させることで2番目のリグニン懸濁液を得、そしてpHレベルを6未満に調整し、
c)前記2番目のリグニン懸濁液の脱水を実施し、
d)洗浄水を添加しそして置換洗浄をpHの劇的な変化を伴わせることなく多少とも一定した条件下で実施し、そして
e)段階d)でもたらされたリグニンケーキの脱水を実施して高度に乾燥させかつ前記濾過ケーキに残存していた洗浄液を追い出すことで、段階d)の置換洗浄後に更により高い乾燥度を示すリグニン生成物を得る、
段階を含んで成る方法。 - 段階a)および/または段階c)の脱水をフィルタープレス装置で実施し、前記フィルタープレス装置の中の濾過ケーキの中に気体または気体混合物を吹き込むことで残存する黒色液を処理する請求項1記載の方法。
- 段階b)でpHレベルを4未満に調整する請求項1記載の方法。
- 前記洗浄水のpHレベルを6未満にする請求項1記載の方法。
- 段階a)で得た濾過ケーキを段階b)に示すようにして懸濁させる前に気体または気体混合物を用いてそれを前記ケーキの中に吹き込む請求項1記載の方法。
- 前記pHレベルの調整とイオン強度の調整を一緒に実施する請求項1記載の方法。
- 前記一緒に調整を実施するpHレベルおよびイオン強度が前記洗浄液のpHレベルおよびイオン強度に相当する請求項6記載の方法。
- 段階a)の1番目の脱水段階に由来する濾液を回収装置に直接に再循環させる請求項1記載の方法。
- 段階e)の濾液ケーキの中に残存している洗浄液の除去を空気または燃焼排ガスを用いて実施する請求項1記載の方法。
- 段階c)の2番目の脱水に由来する洗浄液および濾液の一部を段階b)の再スラリー化段階に戻すことで酸および水の消費量を更に少なくする請求項1記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0402201A SE0402201D0 (sv) | 2004-09-14 | 2004-09-14 | Method for separating lignin from black liquor |
SE0402201-8 | 2004-09-14 | ||
PCT/SE2005/001301 WO2006031175A1 (en) | 2004-09-14 | 2005-09-08 | Method for separating lignin from black liquor |
Publications (3)
Publication Number | Publication Date |
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JP2008513549A JP2008513549A (ja) | 2008-05-01 |
JP2008513549A5 JP2008513549A5 (ja) | 2008-08-14 |
JP5002458B2 true JP5002458B2 (ja) | 2012-08-15 |
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JP2007531127A Expired - Fee Related JP5002458B2 (ja) | 2004-09-14 | 2005-09-08 | リグニンを黒色液から分離する方法 |
Country Status (11)
Country | Link |
---|---|
US (1) | US8486224B2 (ja) |
EP (1) | EP1794363B2 (ja) |
JP (1) | JP5002458B2 (ja) |
AT (1) | ATE543947T2 (ja) |
BR (1) | BRPI0515247A (ja) |
CA (1) | CA2578382C (ja) |
ES (1) | ES2381915T5 (ja) |
PT (1) | PT1794363E (ja) |
SE (1) | SE0402201D0 (ja) |
WO (1) | WO2006031175A1 (ja) |
ZA (1) | ZA200701568B (ja) |
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-
2004
- 2004-09-14 SE SE0402201A patent/SE0402201D0/xx unknown
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2005
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- 2005-09-08 US US11/659,733 patent/US8486224B2/en active Active
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WO2006031175A1 (en) | 2006-03-23 |
US20080047674A1 (en) | 2008-02-28 |
SE0402201D0 (sv) | 2004-09-14 |
US8486224B2 (en) | 2013-07-16 |
BRPI0515247A (pt) | 2008-07-15 |
ZA200701568B (en) | 2008-08-27 |
EP1794363B1 (en) | 2012-02-01 |
ES2381915T3 (es) | 2012-06-01 |
EP1794363B2 (en) | 2017-01-18 |
ATE543947T2 (de) | 2012-02-15 |
PT1794363E (pt) | 2012-05-07 |
CA2578382C (en) | 2013-07-02 |
ES2381915T5 (es) | 2017-09-01 |
CA2578382A1 (en) | 2006-03-23 |
JP2008513549A (ja) | 2008-05-01 |
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