EP0063565A1 - Use of ethanol in alkaline pulping - Google Patents
Use of ethanol in alkaline pulpingInfo
- Publication number
- EP0063565A1 EP0063565A1 EP19810901196 EP81901196A EP0063565A1 EP 0063565 A1 EP0063565 A1 EP 0063565A1 EP 19810901196 EP19810901196 EP 19810901196 EP 81901196 A EP81901196 A EP 81901196A EP 0063565 A1 EP0063565 A1 EP 0063565A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ethanol
- pulping
- wood
- pulp
- naoh
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000004537 pulping Methods 0.000 title claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 14
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000002023 wood Substances 0.000 claims description 10
- 241000218657 Picea Species 0.000 claims description 5
- 235000011121 sodium hydroxide Nutrition 0.000 description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 150000001298 alcohols Chemical class 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 235000014633 carbohydrates Nutrition 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/20—Pulping cellulose-containing materials with organic solvents or in solvent environment
Definitions
- This invention relates to wood pulping using chemical pulping media and more particularly relates to such media which result in superior wood pulps with a lower refining energy requirement.
- a method for manufacturing wood pulp which comprises pulping wood with a mixture of ethanol and sodium hydroxide.
- the invention also includes wood pulp manufactured in accordance with the method. DETAILED DESCRIPTION OF THE INVENTION
- the pulping time in accordance with the preferred embodiment, is from about 1/2 to about 4 hours and the pulping temperature is from about 100 to about 200°C.
- any wood can be pulped in accordance with the method of the invention to obtain a superior wood pulp than was obtained by commercially usuable prior arti chemical wood pulping methods.
- Spruce chips are cooked in an electrically heated digester with mixtures of water and ethanol (1 :1 by volume), at a 5:1 liquor to wood ratio, 170°C for 2-1/2 hr.
- cooks under the same conditions were carried out with the addition of 20% NaOH (calculated on wood), and with alkali alone.
- Table 1 shows that ethanol plus NaOH (column 1) is more effective than either ingredient alone
- the ethanol-NaOH process is especially significant in the area of high-yield pulping, because it allows a greater preservation of carbohydrates than NaOH alone. So, e.g., an ethanol-NaOH pulp of 81.6% yield (obtained with 5% NaOH, 170°C, 45 min.) has a Kappa number of 157, while a soda pulp (obtained with 20% NaOH) of 66% yield has a very similar (147) Kappa number. This is because in soda pulping only limited delignif ication can occur, thus low Kappa number pulps are obtained.
Landscapes
- Paper (AREA)
Abstract
Procede de fabrication de pulpe de bois comprenant la reduction en pulpe du bois au moyen d'un melange d'ethanol et d'hydroxyde de sodium et pulpe de bois obtenue conformement a ce procede.Method for manufacturing wood pulp comprising reduction of wood pulp by means of a mixture of ethanol and sodium hydroxide and wood pulp obtained in accordance with this method.
Description
USE OF ETHANOL IN ALKALINE PULPING BACKGROUND OF THE INVENTION
A) Field of the Invention
This invention relates to wood pulping using chemical pulping media and more particularly relates to such media which result in superior wood pulps with a lower refining energy requirement.
B) History of the Prior Art
In the prior art, chemical pulping media were used to manufacture wood pulp. Such media have included both alkali and sulfur based media. The conventional pulping based on sulfur results in a good wood pulp but unfortunately the sulfur containing media (sulfite) contributes to both air and water pollution.
Attempts have been made to use low boiling alcohols as wood pulping media. In general, alcohols alone do not result in sufficiently effective pulping. An attempt has been made to use methanol in the presence of caustic soda. Unfortunately, methanol is too toxic to be used in such a process. BRIEF DESCRIPTION OF THE INVENTION
In accordance with the invention there is provided a method for manufacturing wood pulp which comprises pulping wood with a mixture of ethanol and sodium hydroxide. The invention also includes wood pulp manufactured in accordance with the method.
DETAILED DESCRIPTION OF THE INVENTION
It has been unexpectedly found that the combination of ethanol with sodium hydroxide delignifies wood to a much greater extent than either the ethanol or sodium hydroxide alone.
In accordance with the preferred embodiment of the invention, from about 10 to 25 weight percent of sodium hydroxide is used and from about 10 to about 60 volume percent of ethanol is used. The pulping time, in accordance with the preferred embodiment, is from about 1/2 to about 4 hours and the pulping temperature is from about 100 to about 200°C.
Essentially any wood can be pulped in accordance with the method of the invention to obtain a superior wood pulp than was obtained by commercially usuable prior arti chemical wood pulping methods.
The following examples serve to illustrate and not limit the present invention. Unless otherwise indicated, all parts and percentages are by weight. EXAMPLE 1.
Spruce chips are cooked in an electrically heated digester with mixtures of water and ethanol (1 :1 by volume), at a 5:1 liquor to wood ratio, 170°C for 2-1/2 hr. For comparison, cooks under the same conditions were carried out with the addition of 20% NaOH (calculated on wood), and with alkali alone. Table 1 shows that ethanol plus NaOH (column 1) is more effective than either ingredient alone
TABLE 1. Effect of Ethanol and NaOH in Pulping of Norway
Spruce.
TABLE 1. Effect of Ethanol and NaOH in Pulping of Norway
Spruce. Cooking time 2-1/2 hr. Temp. 170°C. Pulp Properties at -300 ml CSF:
The increased selectivity with respect to lignin is evident from the lower yield, lower Kappa number, lower refining energy requirement, higher tensile index, and higher brightness of the pulp. EXAMPLE 2.
In view of the greater delignif ication selectivity of the ethanol-NaOH process, the cooking time is soda pulping could be reduced substantially by addition of ethanol, without impairing the quality of the product. Table 2 illustrates this effect. It is evident that almost the same pulp yield can be obtained with ethanol-NaOH in 45 min. as with NaOH in 150 min. In addition, the former pulp has a lower Kappa number (75.5 vs 93.1). The strength properties of the two pulps are very similar.
EXAMPLE 3.
The ethanol-NaOH process is especially significant in the area of high-yield pulping, because it allows a greater preservation of carbohydrates than NaOH alone. So, e.g., an ethanol-NaOH pulp of 81.6% yield (obtained with 5% NaOH, 170°C, 45 min.) has a Kappa number of 157, while a soda pulp (obtained with 20% NaOH) of 66% yield has a very similar (147) Kappa number. This is because in soda pulping only limited delignif ication can occur, thus low Kappa number pulps are obtained.
Claims
1 . A method for manufacturing wood pulp which comprises pulping wood with a mixture of ethanol and sodium hydroxide.
2. The method of Claim 1 wherein from about 1 0 to 25 weight percent of NaOH is used.
3. The method of Claim 2 wherein from about 1 0 to 60 volume percent ethanol is used.
4. The method o f Claim 1 wherein the pulping time is from about 1 / 2 to about 4 hour s and the pulping temperature is from about 1 00 to about 200°C.
5. The method of Claim 1 wherein the wood is spruce.
6. A wood pulp manufactured in accordance with Claim 1 .
7. The wood pulp of Claim 5 wherein the pulp is a spruce wood pulp.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US1980/001451 WO1982001568A1 (en) | 1980-10-29 | 1980-10-29 | Use of ethanol in alkaline pulping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0063565A1 true EP0063565A1 (en) | 1982-11-03 |
Family
ID=22154626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19810901196 Withdrawn EP0063565A1 (en) | 1980-10-29 | 1980-10-29 | Use of ethanol in alkaline pulping |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0063565A1 (en) |
| WO (1) | WO1982001568A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3212767A1 (en) * | 1982-04-06 | 1983-10-06 | Nicolaus Md Verwaltungsges | METHOD AND REACTOR FOR CONTINUOUSLY UNLOCKING PLANT FIBER MATERIAL |
| AT510346A1 (en) | 2010-09-02 | 2012-03-15 | Annikki Gmbh | lignin |
| AR091998A1 (en) | 2012-05-03 | 2015-03-18 | Annikki Gmbh | CELLULOSE PREPARATION PROCEDURE WITH LIGNIN LOW CONCENTRATION |
| US10077283B2 (en) | 2013-11-20 | 2018-09-18 | Annikki Gmbh | Process for fractionating lignocellulosics |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2166540A (en) * | 1937-12-17 | 1939-07-18 | Univ Minnesota | Alcoholic treatment of ligneous cellulosic material |
| JP3093387B2 (en) * | 1991-12-02 | 2000-10-03 | キヤノン株式会社 | measuring device |
-
1980
- 1980-10-29 WO PCT/US1980/001451 patent/WO1982001568A1/en not_active Ceased
- 1980-10-29 EP EP19810901196 patent/EP0063565A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8201568A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1982001568A1 (en) | 1982-05-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT CH DE FR GB LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19821227 |