CN1004288B - The efficient chemical degumming of hemp method of removing lignin - Google Patents
The efficient chemical degumming of hemp method of removing lignin Download PDFInfo
- Publication number
- CN1004288B CN1004288B CN87101264.2A CN87101264A CN1004288B CN 1004288 B CN1004288 B CN 1004288B CN 87101264 A CN87101264 A CN 87101264A CN 1004288 B CN1004288 B CN 1004288B
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- China
- Prior art keywords
- bleaching
- hemp
- refining
- lignin
- fiber crops
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Abstract
A chemical degumming of hemp method for efficient removal lignin, is to benefit from the technique similar with ramie chemically quick-degumming new technology, it is characterized by, and bleaching process is made up of the bleaching of acid bleaching-refining-alkalescence.After hemp being processed by method of the present invention, the content of its lignin can be below 0.5%, and row yielding remains on 50-55%, and fiber tension is 3～4 grams/DENIER, and degummed ramie is pure white loose, and quality is good.
Description
The present invention relates to the chemical degumming of hemp method of natural fabric.A kind of particularly chemical degumming of hemp method of efficient removal lignin.
Hemp is the same with other bast-fibre, has brute force high, extends the features such as little, rigidity is large, humidity absorption and release is fast, has good wearability and value of exploiting and utilizing.In hempen original ramie, mainly contain the pigment of cellulose, hemicellulose, pectin, lignin, the cured matter of fat, the hydrotrope, ash content and minute quantity and tannin etc., wherein the composition of non-cellulose accounts for 40 left and right, in non-cellulose composition, the content maximum of hemicellulose and lignin, because hemicellulose is unformed incrusting substance, its degree of polymerization is lower, and hygroscopicity and swollen degree are all high compared with cellulose, are easily split structure by bronsted lowry acids and bases bronsted lowry liquid.Therefore, the hemicellulose overwhelming majority by being split structure, becomes monose and dissolves in alkali lye, by sour hydrolysis, and a solubilized part wherein again.Adopting ramie fast degumming new technology (see " textile journal " 83 years the 2nd phase the 19th page) is satisfiable to the removal of hemp hemicellulose substantially.But lignin amount is up to 6～8% in hempen original ramie colloid, and lignin molecule is benzene ring structure, forms a kind of alkali stable structure, more obstinate, be difficult for removing, and through general soda boiling technique, be to remove up hill and dale lignin.Patent Office of the People's Republic of China discloses " process for chemical degumming of hemp " patent of invention that the application number of a kind of Dongping Hemp Mill, Shandong Prov. application is 85105350 on January 14th, 1987, this patent application only has the statement of process, but do not see quality index, as row yielding and content of lignin etc., its technique content is actually Strain Hunan state ramie textile printing and dyeing mill and adopts the fast degumming tech of sodium phosphate trimer to be implanted on hemp degumming to use.Through I the product of Dongping Hemp Mill, Shandong Prov. is measured, in its hemp, the content of lignin is 2.84% left and right.Because lignin contains brown group, thereby cause the gloss of fiber to be brown, fiber is thick and stiff, crisp, poor flexibility, and spinning property and dyeing ability are poor, not sun-resistant.In the time that the content of lignin is below 1%, fiber is nature true qualities, pure white and not yellowing.
Task of the present invention is exactly in order to remove the lignin in hemp, makes its content below 1%, and is unlikely reduction row yielding and fiber strength is not incurred loss.
According to above-mentioned task, we have adopted the technique similar with above-mentioned ramie chemically quick-degumming new technology, that is: fiber crops-bleach-dewater-tremble fiber crops-oil supply-de-oiled water-tremble fiber crops-oven dry-degummed ramie is boiled-copied to boil-II of binding-dress cage-pickling-I, difference is after fiber crops, to adopt acid bleaching-refining-alkaline bleaching process copying, it with floating of adopting of the de-fiber crops of general ramie, acid, wash essential difference.In the liquor natrii hypochloritis that acid bleaching operation of the present invention is is 2～4 in pH value, sealing is carried out, and liquor natrii hypochloritis regulates with sulfuric acid, and its effective chlorine density is 1～1.5 grams per liter, 20～30 DEG C for the treatment of temperatures, 8～12 minutes processing times.With sodium hypochlorite bleaching boiling-off hemp, object Shi Yao chlorlignin or oxidative lignin, make it easy removal.
In acid medium, bleaching liquor hypochlorite is oxidized to chlorate.CLO
-+2HCLO
CLO
- 3+2H+2CL
-
The hydrochloric acid generating decomposes after hypochlorite again, generates again hypochlorous acid.
H
++CLO
--HCLO
Hypochlorous acid, under inorganic acid effect, is emitted chlorine.
CLO
-+2H
-+2CL
--CL
-+H
2O+CL
2
Therefore, in acid solution, bleaching is taking chlorination as main, and the lignin of chlorination adopts in dilute alkaline soln again and carries out refining, can be molten except lignin.
Refining adopts following technological parameter: amount of caustic soda 3～4%, and tetrasodium pyrophosphate consumption 1～2%, sodium sulfite consumption 1～2%, is more than raw ramie weight, and bath raio 1: 7～1: 10, boils and boils 1.5～2 hours.
The course of reaction of chlorlignin and alkali is;
R
-CL+2NaOH-R
--ONa+NaCL+H
2O
Can understand thus the principle place of the boiling-off fiber crops that adopted acid liquor natrii hypochloritis to process to copy.Object Shi Yao chlorlignin; And then refining in immigration dilute alkaline soln, reach the object of removing lignin.
After refining, why will adopt alkalescence bleaching, be that the decomposable process of hypochlorite solutions is mainly divided into two aspects to carry out because in alkaline medium, the one, and hypochlorite is first oxidized to chlorite.
Then chlorite is oxidized to chlorate again.
Chlorite has discoloration to flax fibre, and very little to cellulosic loss, and they can play discoloration to the residual pigment of refining fiber crops.In the liquor natrii hypochloritis that alkalescence bleaching is is 9～12 in pH value, carry out, liquor natrii hypochloritis regulates with caustic soda, and its effective chlorine density is 0.8～1.2 grams per liter; 20～30 DEG C for the treatment of temperatures, 5～8 minutes processing times.
The Main Function of alkalescence bleaching that hence one can see that is that the effect of bleaching is here mainly oxidation, makes part alkali resistance lignin benzene ring structure break and degrade, and is easy to molten removing to the hemp bleaching after refining.
Hempen original ramie is after the process II level boiling-off that is auxiliary agent with tetrasodium pyrophosphate and sodium sulfite, adopt again the postprocessing working procedures of acid bleaching-refining-alkalescence bleaching, very high to the removal efficiency of lignin in hemp, content can be below 0.5%, and its degummed ramie is pure white, loose, quality is good, and because fibre damage is little, its row yielding can remain on 50～55%, fiber tension is 3～4 grams/DENIER, has met the requirement of spinnability.
Below embodiments of the invention:
Technological process: binding-dress cage-pickling-washing-I boils-washes-II boils-wash-copy fiber crops-acid bleaching-refining-alkalescence to bleach-wash-dewater-tremble fiber crops-oil supply-de-oiled water-tremble fiber crops-oven dry-packing-warehouse-in.
Technological parameter:
Binding: cut off 10 centimeters of long left and right of hemp root, arrange numb handle, every 0.5 kilogram.
Dress cage: order is put handle, and every layer of screen do not omitted placement, notes not loose.
Pickling: sulfuric acid 1.5～2 grams per liters, bath raio 1: 14,1.5～2 hours time, 50～60 DEG C of temperature.
Washing: cold water flush one time 5 minutes.
I is boiled: generally applies mechanically II and boils waste liquid, and when new dosing, caustic soda 8～10 grams per liters, sodium sulfite 2～3%, tetrasodium pyrophosphate 1～2%(is to raw ramie weight), bath raio 1: 11, pressure 2 kilograms per centimeter
2, circulation boiling-off 2 hours.
Washing: more than 75 DEG C hot water circuit is rinsed 2 times, each 5 minutes.
II is boiled: caustic soda 15～20 grams per liters, and sodium sulfite 3～4%, tetrasodium pyrophosphate 2～3%(is to raw ramie weight), bath raio 1: 11, pressure 2 kilograms per centimeter
2circulation boiling-off 1.5 hours.
Washing: more than 75 DEG C hot water circuit is rinsed 1 time 5 minutes.
Copy fiber crops: each 3～4 volumes.
Acid bleaching: clorox concentration (effective chlorine density) 1～1.5 grams per liter, pH2～4,20～30 DEG C for the treatment of temperatures, in 8～12 minutes processing times, chlorination is carried out in sealing, places 30～60 minutes, not washing.
Refining: caustic soda 3～4%(is to raw ramie weight), tetrasodium pyrophosphate 1～2%(is to raw ramie weight), sodium sulfite 1～2%(is to raw ramie weight), bath raio 1: 7, boils and boils 2 hours.
Alkalescence bleaching: clorox concentration (effective chlorine density) 0.8～1.2 grams per liter, pH9～12,20～0 DEG C for the treatment of temperatures, 5～8 minutes processing times.
Washing: cold wash 5 minutes.
Dehydration: moisture below 55%.
Tremble fiber crops:
Oil: finish oil content 1.5%, 80～100 DEG C of temperature, 3 hours time.
De-oiled water: moisture below 55%.
Tremble fiber crops:
Dry: 70～100 DEG C of slowly oven dry of temperature.
Packing:
Warehouse-in:
Claims (4)
1, a kind of chemical degumming of hemp method of efficient removal lignin, technological process is that fiber crops-bleach-dewater-tremble fiber crops-oil supply-de-oiled water-tremble fiber crops-oven dry-degummed ramie is boiled-copied to boil-II of binding-dress cage-pickling-I, it is characterized in that: bleaching process is made up of the bleaching of acid bleaching-refining-alkalescence.
2, in accordance with the method for claim 1, it is characterized in that: in the liquor natrii hypochloritis that acid bleaching is is 2～4 in pH value, sealing is carried out, liquor natrii hypochloritis regulates with sulfuric acid, its effective chlorine density is 1～1.5 grams per liter, 20～30 DEG C for the treatment of temperatures, 8～12 minutes processing times, after handling, do not wash, place and within 30～60 minutes, directly enter refining.
3, in accordance with the method for claim 1, it is characterized in that, refining procedure adopts following technological parameter, amount of caustic soda 3～4%, tetrasodium pyrophosphate consumption 1～2%, sodium sulfite consumption 1～2%; bath raio 1: 7～1: 10, boil and boil 1.5～2 hours, and above % is raw ramie weight.
4, in accordance with the method for claim 1, it is characterized in that, in the liquor natrii hypochloritis that alkalescence bleaching is is 9～12 in pH value, carry out, liquor natrii hypochloritis regulates with caustic soda, its effective chlorine density is 0.8～1.2 grams per liter, 20～30 DEG C for the treatment of temperatures, 5～8 minutes processing times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87101264.2A CN1004288B (en) | 1987-12-26 | 1987-12-26 | The efficient chemical degumming of hemp method of removing lignin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87101264.2A CN1004288B (en) | 1987-12-26 | 1987-12-26 | The efficient chemical degumming of hemp method of removing lignin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87101264A CN87101264A (en) | 1988-07-27 |
| CN1004288B true CN1004288B (en) | 1989-05-24 |
Family
ID=4813284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87101264.2A Expired CN1004288B (en) | 1987-12-26 | 1987-12-26 | The efficient chemical degumming of hemp method of removing lignin |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004288B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022015179A1 (en) | 2020-07-13 | 2022-01-20 | Firma Handlowo-Usługowa Instbud Stanisław Boguta Spółka Jawna | The multi-layer composite sleeve, in particular for trenchless pipeline rehabilitation |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1050391C (en) * | 1994-11-05 | 2000-03-15 | 肥城市对外贸易总公司精麻加工厂 | Culture and processing Technology for ramie |
| CN1099500C (en) * | 2000-11-21 | 2003-01-22 | 沈阳市天然纤维研究所 | Method for producing chlorine-free bleached pulp, paper and paper board by using hemp stem |
| CN100415882C (en) * | 2003-10-28 | 2008-09-03 | 北京农业生物技术研究中心 | Method for regulating lignin in populus tomentosa |
| CN100346011C (en) * | 2006-06-05 | 2007-10-31 | 浙江理工大学 | Hemp degumming process |
-
1987
- 1987-12-26 CN CN87101264.2A patent/CN1004288B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022015179A1 (en) | 2020-07-13 | 2022-01-20 | Firma Handlowo-Usługowa Instbud Stanisław Boguta Spółka Jawna | The multi-layer composite sleeve, in particular for trenchless pipeline rehabilitation |
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| Publication number | Publication date |
|---|---|
| CN87101264A (en) | 1988-07-27 |
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