CN1198492A - Pollution-free pulping technology in paper-making - Google Patents
Pollution-free pulping technology in paper-making Download PDFInfo
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- CN1198492A CN1198492A CN 97110644 CN97110644A CN1198492A CN 1198492 A CN1198492 A CN 1198492A CN 97110644 CN97110644 CN 97110644 CN 97110644 A CN97110644 A CN 97110644A CN 1198492 A CN1198492 A CN 1198492A
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- paper
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- sugar
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Abstract
The present invention relates to a production process of paper pulp free from pollution, belonging to the field of paper-making technology by using rice-straw and wheat-straw as raw material. It is characterized by that at the same time of cooking rice-straw and wheat-straw, using dilute acid as catalyst to hydrolyze the hydrolyzable sugar, then using the hydrolytic sugar to produce wood sugar or oxalic acid, and using cooked rice-straw and wheat-straw to make paper pulp by means of mechanical milling process. The obtained paper pulp can be directly used to produce corrugated paper and paper board, if said paper pulp is bleached, the bleached paper pulp also can be used to produce handmade paper and newsprinting paper, etc.
Description
The present invention relates to a kind of free of contamination method for making paper pulp, belong to technical field with the rice generated by making paper with wheat straws of rich cellulose.
In recent years, the pollution of papermaking has become the problem that countries in the world are gazed at, and China closed all paper mills below 5000 tons since last year, mainly is not handle well because of paper industry sewage.To the existing many patents of the improvement of paper-making pollution, during enforcement, investment is big, weak effect.And the present invention's proposition is a kind of free of contamination pulping technology for paper-making.
The object of the present invention is achieved like this:
Rice wheat straw after the chopping, make catalyst with the sulfuric acid below 5% (or other acid), in 100-160 ℃ of temperature and 0.1-0.8MPa pressure limit, be hydrolyzed, the hydrolyzate that contains pentose, hexose that obtains, through with in limewash or the calcium carbonate and the deacidification, be evaporated to contain sugared 30%-70% scope after, produce oxalic acid with oxidizing process.Rice wheat straw after the hydrolysis after repeatedly water jacket is washed, is worn into paper pulp with the mechanical jordaning method.This paper pulp can be directly used in the production of corrugated paper, cardboard; If handle through bleaching, can be used for producing newsprint, handmade paper.The cover scouring water, washing number of times with cover increases, and the acid that contains in the water, sugared concentration raise, and are used further to hydrolysis behind complex acid.In and the time gypsum that produces, remove after filtration, send cement plant making cement raw material to use after the drying.
Embodiment 1
Get the 200g wheat straw, chopping is packed experiment into in the rotary spherical digester, adds the sulfuric acid of 260g2%, and the feeding steam keep-ups pressure and is 0.2PMa, and boiling 4 hours is chilled to 80 ℃ and emits, and filters.It is 3 that filtrate is neutralized to pH with calcium carbonate, filters, and filtrate is through concentrated the syrup 80g that reduces pressure.Through getting oxalic acid 42.5g with oxidizing process production.The wet wheat straw that filtration obtains washes the back with water and uses the mechanical pulping defibrination, can get paper pulp 142.8g, can be used to produce corrugated paper, cardboard.
Embodiment 2
To wash the wash water of wheat straw after the hydrolysis among the embodiment 1, add an amount of sulfuric acid and transfer to Baume degrees 1.7 (2%), repeat the process of embodiment 1,, get paper pulp 140.1g, can be used to produce newsprint, handmade paper the 142.8g paper pulp hydrogen peroxide bleaching that obtains.
Embodiment 3
Repeat example 2,,, get paper pulp 139g, can be used for handmade paper production with the calcium hypochlorite bleaching with the 142.8g paper pulp that obtains.
Owing to produced chemical products oxalic acid with the waste water of boiling rice wheat straw, so the production process of pulp is pollution-free, the present invention is a kind of rising technology.
If the depickling of hydrolyzate process ion exchange resin, purification, activated carbon decolorizing, through concentrating, crystallization also can be produced wood sugar, pollution abatement again.
Embodiment 4
Repeat the hydrolytic process of example 1, with hydrolyzate through ion exchange resin depickling, purification, activated carbon decolorizing, condensing crystallizing can get wood sugar 20.5g.
Claims (6)
1, a kind of free of contamination pulping technology for paper-making is characterized in that:
(1) the rice wheat straw with dilute sulfuric acid boiling hydrolysis, is extracted facile hydrolysis sugar such as pentose earlier
(2) hydrolysis sugar that obtains is produced the oxalic acid pollution abatement with oxidizing process.
(3) hydrolysis sugar that obtains also can be used for producing the wood sugar pollution abatement.
(4) the rice wheat straw after the hydrolysis with the method for mechanical jordaning, is produced and can be directly used in the paper pulp of producing corrugated paper, cardboard after repeatedly water jacket is washed.Through bleaching, also can be used for the production of newsprint, handmade paper.
(5) repeatedly overlap the waste water of washing, continue on for complex acid and use, remove fully and pollute.
2, according to claim 1 described method, it is characterized in that said dilute acid hydrolysis, be meant the hydrolysis that the rice wheat straw carries out under the temperature conditions of the pressure of 0.1-08PMa and 100-160 ℃ with the inorganic acid below 5%.
According to claim 1 described method, it is characterized in that 3, that hydrolyzate is converted into oxalic acid by oxidizing process and has eliminated pollution after concentrating through neutralizing, obtained paper pulp.
4, according to claim 1 described method, it is characterized in that hydrolyzate if do not produce oxalic acid, also can be through purifying, decolouring, concentrating, crystallization, produce wood sugar and pollution abatement.
5, according to claim 1 described method, it is characterized in that the rice wheat straw after the hydrolysis, wash through water jacket repeatedly, after extruding dewaters, wear into paper pulp with the mechanical jordaning method.
6, according to claim 1 described method, the cover scouring water is back to the preparation diluted acid for the hydrolysis of rice wheat straw, and pollution abatement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97110644 CN1198492A (en) | 1997-05-01 | 1997-05-01 | Pollution-free pulping technology in paper-making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97110644 CN1198492A (en) | 1997-05-01 | 1997-05-01 | Pollution-free pulping technology in paper-making |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1198492A true CN1198492A (en) | 1998-11-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97110644 Pending CN1198492A (en) | 1997-05-01 | 1997-05-01 | Pollution-free pulping technology in paper-making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1198492A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537352A (en) * | 2018-11-05 | 2019-03-29 | 郓城海沁纤维有限公司 | The catalyst and technique for applying that ZYX preimpregnation catalysis plant fiber is slurried |
-
1997
- 1997-05-01 CN CN 97110644 patent/CN1198492A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537352A (en) * | 2018-11-05 | 2019-03-29 | 郓城海沁纤维有限公司 | The catalyst and technique for applying that ZYX preimpregnation catalysis plant fiber is slurried |
| CN109537352B (en) * | 2018-11-05 | 2021-06-01 | 郓城海沁纤维有限公司 | Catalyst for catalyzing plant fiber pulping by ZYX presoaking and application process |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |