CN1061253A - A kind of method of utilizing ammonium sulfite and calcium hydroxide pulping - Google Patents
A kind of method of utilizing ammonium sulfite and calcium hydroxide pulping Download PDFInfo
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- CN1061253A CN1061253A CN 91109665 CN91109665A CN1061253A CN 1061253 A CN1061253 A CN 1061253A CN 91109665 CN91109665 CN 91109665 CN 91109665 A CN91109665 A CN 91109665A CN 1061253 A CN1061253 A CN 1061253A
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- ammonium sulfite
- calcium hydroxide
- rotary spherical
- spherical digester
- pulping
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Abstract
The invention relates to the improvement of neutral ammonium sulfite pulping process, its way is only need add ammonium sulfite and calcium hydroxide when feeding intake, replace and to add the cost height in the past, the caustic soda or the medicines such as ammoniacal liquor, carbon ammonium of easy pollution, corrosivity, slurrying can be shortened digestion time in this way, and paper pulp yield improves, easily bleaching, reduce cost, and alleviated the corrosion of equipment.
Description
The present invention relates to a kind of pulping and papermaking method, the method for especially neutral ammonium sulfite slurrying.
Neutral ammonium sulfite pulp-making method (abbreviation Ammonium Sulfite Method), external the '30s begins to be applied to industry, mainly produces semi-chemical pulp with leaf wood, and China's sixties also begin should to be used for making at small paper mill the paper pulp of careless class and bagasse, produce cultural paper.The characteristics of Ammonium Sulfite Method are that cost is lower than alkaline process, and the ammonium sulfite source is wide, and paper plant's waste water and dregs need not handled can make farmland fertilizer, has reduced environmental pollution.But the shortcoming of Ammonium Sulfite Method maximum is an etching apparatus, because digestion process inferior sulfate radical and lignin reaction generate organic acid, rotary spherical digester adds that under acid condition the friction of material can be corroded, and organic acid also can destroy cellulose, paper pulp yield is descended, for this part acid that neutralizes, when feeding intake, normally add ammoniacal liquor, additives such as carbon ammonium or urea, the pH value of slurries is about 7 during with the assurance boiling end, but these addings that contain ammoniacal substance are volatilized material heating back ammonia in a large number, add that original adding ammonium sulfite also decomposites ammonia, make ammonia dividing potential drop rising in the rotary spherical digester, stagnation pressure also raises, cooking speed has slowed down, in addition, the leakage of ammonia also can make work situation worsen, and influences workers'health, main, ammonia itself also is a kind of corrosive agent, and equipment is had stronger corrosiveness, so at present domestic paper mill uses pulping with ammonium sulfite method not general.
The object of the present invention is to provide a kind of new pulping process that can overcome the weak point that exists in the existing pulping with ammonium sulfite method process.
As everyone knows, (rotary spherical digester feeds 5-7kg/cm to imonium under hot conditions
2Steam), very fast decomposition ammonification and sulfur dioxide:
The SO that generates
2Generate lignosulfonic acid with lignin reaction, neutralize with ammoniacal liquor then, when ammonia is excessive, ammoniacal liquor causes very big corrosion to equipment, and can evaporate when unloading ball, influences operating environment, so add ammoniacal liquor and carbon ammonium or urea, ammonia changes gas phase over to after the boiling, is difficult to neutralize with the acid of liquid phase, and pH value is less than 7.So what have adds in the caustic soda and organic acid in the imido method, mitigate corrosion is had certain effect, but caustic soda is in short supply, the cost height, discharge of wastewater can pollute, and does not in fact also have outstanding advantage.The inventor replaces ammoniacal liquor and ammoniation and caustic soda through test of many times with calcium hydroxide (milk of lime, limewash), finds that effect is fine.
Past has the people to think that ammonium sulfite adds calcium hydroxide, under the condition of acidity, can generate calcium sulfite and calcium sulfate precipitation, cause digestion process raw material caking, pulping not, so it is industrial that nobody is applied to, and the inventor finds in test, under specific temperature and pressure, do not generate calcium sulfate precipitation, but following chemical reaction taken place:
This is an exothermic reaction, and stewing temperature is raise, and reduces steam consumption.The temperature that this reaction requires is 140-170 ℃, and steam pressure is the 5-7 kilograms per centimeter.
The Ca(HSO that generates
3)
2Can be water-soluble, unreacted Ca(OH)
2The NH that obtains with reaction
4OH just can neutralize with organic acid, and the PH when having reached boiling end like this, does not just have unnecessary ammonia corrosion equipment about 7.
Facts have proved, use calcium hydroxide and replace additives such as ammoniacal liquor, carbon ammonium, caustic soda, for quickening the infiltration of medicine to fiber, it all is favourable shortening digestion time or reducing the boiling maximum temperature, it has overcome the harm of imonium-ammoniacal liquor method to environment and equipment, has also overcome alkaline process and has not exclusively discharged the pollution that causes because of reclaiming.
Below narrate the concrete grammar of imonium-calcium hydroxide pulping:
With quick lime, require to contain calcium oxide more than 85%, color is pure white, and impurity is few, adds water and is reacted into milk of lime, and elimination solid insoluble and fibrous raw material are put into rotary spherical digester together, add the water mixing, add ammonium sulfite again, general every m
3Forage or bagasse need ammonium sulfite 15-20 kilogram, carbonate-free lime 3-6 kilogram, conifer timber can suitably increase imonium and lime consumption, and the amount that is added to rotary spherical digester water is identical with common Ammonium Sulfite Method, but temperature in the adjusting rotary spherical digester and steam pressure are crucial, and generally controlling steam pressure is 5-7kg/cm
2, temperature is 140-170 ℃, temperature, pressure is too low or too high all can to make cooking quality poor (starch half-cooked or scab), but also easily generate water-fast calcium sulfite or calcium sulfate precipitation, after feeding steam makes rotary spherical digester reach temperature and pressure, be incubated 2-2.5 hour, pulp promptly according to a conventional method.
Slurrying as stated above has the following advantages:
1. the calcium oxide raw material is easy to get, and by the existing market situation, price only is 1/2 of a carbon ammonium, 1/3 of caustic soda, and 1/7 of urea, cost greatly reduces.
2. the shortening digestion time reduces steam pressure, thus can reduce coal consumption, power, the raising daily output, through on probation, as 25m
3The producer of rotary spherical digester boiling bagasse system semi-chemical pulp, paper pulp yield increases, and the daily output can be increased to 5 ton per days from 3 ton per days.
3. the paper pulp color of boiling gained is whiter, rinsing easily, and this is that the paper sheet stiffness that is ferreted out is bigger because limewash itself is exactly good bleaching agent, paper is smooth, good product quality.
4. seven months the trial run of clever sugar refinery papermaking subsidiary factory through Yongning, Guangxi county, with imonium-ammonium carbonate method boiling contrast, rotary spherical digester corrosion situation of the present invention is greatly taken on a new look in the identical time.
5. the discharging of waste liquid of boiling post processing paper is behind the farmland, calcium ion can not produce damaging influence to the structure of soil, and the water holding capacity of soil is damaged with the sodium ion of alkaline process, also can't handle the waste residue of discharge with the method for calcium sulfite boiling paper.
Embodiments of the invention
Beginning is at the 25m of cleverness sugar refinery, Yongning, Guangxi county papermaking subsidiary factory at the beginning of 1991
3Test on the rotary spherical digester, raw materials used is bagasse, produces half chemical corrugation paper pulp, raw material 25m
3, mix 85%-450 kilograms of water ammonium sulfites, quick lime (containing CaO85%) 120 kg, cooking pressure 6.5 kilograms per centimeter
2, temperature retention time 2.5 hours, average every ball cost of material is 380 yuan, the daily output improves the 1-2 ton than control group,
Control group, rotary spherical digester volume 25m
2, (85%) 520 kilogram of imonium, 150 kilograms of carbon ammoniums, maximum cooking pressure 7.5 kilograms per centimeter
2, temperature retention time 3-3.5 hour, owing to a large amount of volatilizations of ammonia, general pH value was not about 7 after the boiling, but between the 1-3, equipment corrosion is bigger, 500 yuan of every ball costs of material.
With other method contrast, 91 years to the sampling of Liao Ping paper mill, Binyang County, Guangxi bagasse raw material production, rotary spherical digester 25m
3, 1000 kilograms in caustic soda, 200 kilograms in akali sulphide, cooking pressure 7.5 kilograms per centimeter
2, temperature retention time 1.5-2 hour, every ball cost of material was 918 yuan.
Mountains in a range city, Heng County, Guangxi sugar refinery papermaking subsidiary factory: rotary spherical digester 25m
3, 560 kilograms of imonium, 200 kilograms in caustic soda, cooking pressure 7.5 kilograms per centimeter
2, be incubated 3 hours, 564 yuan of every ball costs of material.
Find out that by above-mentioned example imonium-calcium hydroxide method is all low compared with other several method cost.
List of references:
1. pulping and paper making chemistry technology author: (U.S.) J.P Kai Xi
Light industry publishing house version in 1988
2. the utilization of pulping with ammonium sulfite method and waste liquid thereof
Light industry publishing house in September, 1978 version
Claims (1)
1, a kind of method with the ammonium sulfite pulping and paper-making, be with fibrous plants raw material, water and comprise ammonium sulfite and the spice of additive is added in the rotary spherical digester, feed the water vapour boiling again, under stationary temperature and pressure, be incubated a period of time, it is characterized in that institute's doping is a calcium hydroxide, it is to add the water reaction by calcium oxide to obtain, desired boiling temperature is 140-170 ℃ in the rotary spherical digester, and pressure is the 5-7 kilograms per centimeter
2, temperature retention time 2-2.5 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109665 CN1061253A (en) | 1991-10-25 | 1991-10-25 | A kind of method of utilizing ammonium sulfite and calcium hydroxide pulping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109665 CN1061253A (en) | 1991-10-25 | 1991-10-25 | A kind of method of utilizing ammonium sulfite and calcium hydroxide pulping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1061253A true CN1061253A (en) | 1992-05-20 |
Family
ID=4909921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91109665 Pending CN1061253A (en) | 1991-10-25 | 1991-10-25 | A kind of method of utilizing ammonium sulfite and calcium hydroxide pulping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1061253A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101757843B (en) * | 2008-10-17 | 2012-10-03 | 山东福荫造纸环保科技有限公司 | Improved process for performing ammonium sulfite pulping by using sulfur-containing flue gas absorber |
-
1991
- 1991-10-25 CN CN 91109665 patent/CN1061253A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101757843B (en) * | 2008-10-17 | 2012-10-03 | 山东福荫造纸环保科技有限公司 | Improved process for performing ammonium sulfite pulping by using sulfur-containing flue gas absorber |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |