CN102337689B - Stewing method for preparing bamboo wood dissolving pulp - Google Patents
Stewing method for preparing bamboo wood dissolving pulp Download PDFInfo
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- CN102337689B CN102337689B CN 201110291845 CN201110291845A CN102337689B CN 102337689 B CN102337689 B CN 102337689B CN 201110291845 CN201110291845 CN 201110291845 CN 201110291845 A CN201110291845 A CN 201110291845A CN 102337689 B CN102337689 B CN 102337689B
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Abstract
The invention belongs to the technical field of dissolving pulp preparation and relates to a stewing method for preparing bamboo wood dissolving pulp, which comprises the following steps of: (a) introducing vapor to a boiler: preparing bamboo wood raw materials into slice materials, conveying the slice materials to a digester, and introducing low pressure vapor to the digester while conveying theslice materials; (b) vapor heating and pre-hydrolyzing: heating through the vapor after introducing the vapor to the boiler to pre-hydrolyze the slice materials; (c) neutralizing through white liquor: neutralizing the slice materials and vapor condensed water in the digester through the white liquor in a hot white liquor tank; (d) replacing through hot black liquor: replacing the neutralization liquid waste in the digester through the hot black liquor in a hot black liquor tank; (e) heating and stewing in a temperature control manner to prepare virgin pulp of the bamboo wood dissolving pulp; (f) replacing the washing black liquor, washing and cooling the virgin pulp; and (g) discharging at a low temperature. The invention has the advantages of reducing the production cost, increasing the production efficiency, effectively utilizing the stewing heat and improving the yield and the quality of the bamboo wood dissolving pulp.
Description
Technical field
The invention belongs to preparation bamboo wood dissolving pulp technical field, relate in particular to a kind of boiling method for the preparation of bamboo wood dissolving pulp.
Background technology
Dissolving pulp belongs to highly purified refined stock, and mainly for the production of weaving viscose, nitrocellulose, acetate fiber, glassine paper, carboxymethyl cellulose etc. fiber derivative product, dissolving pulp has widely purposes, and market demand is larger.
Existing dissolving pulp mainly is that cotton linter, needlebush and leaf wood are cotton, the wooden dissolving pulp of main raw material preparation.Because the cultivated area of cotton reduces year by year, cotton linter output is reduced year by year also, and the forest reserves such as needlebush and leaf wood are also because of factors such as ecology, environment environmental protection, and cutting significantly reduces.Therefore, existing cotton, wooden dissolving pulp so develop new dissolving pulp kind, are the effective way cotton with replace imported, wooden dissolving pulp of meeting the need of market take import as main.
China abounds with bamboo, bamboo wide in variety, distribute extensively, more rich bamboo resource is arranged, particularly in south, most areas all has plants bamboo in large area, wherein abundant and concentrated with the bamboo resource in Sichuan, Hunan, Guangxi, Yunnan, Chongqing, has than the large economy exploitation to be worth.Bamboo wood dissolving pulp also has unique function because it contains bamboo fiber except having cotton, chemistry that wooden dissolving pulp is similar or identical, physical property; The fiber product made from bamboo wood dissolving pulp, have good gas permeability, moment water imbibition, stronger ABRASION RESISTANCE and the good characteristics such as dyeability, have again simultaneously natural antibacterial, antibacterial, except mite, deodorization and anti-ultraviolet function, these are that other fiber product does not possess function, be subject to textile industry and consumers in general's favor, therefore, bamboo wood dissolving pulp has very high exploitation value.
The preparation method of existing bamboo wood dissolving pulp is relative with equipment level backward, in the boiling method wherein, need to add liquid and large water gaging, production cost is high, has simultaneously that production efficiency is low, heat utilization rate is not high, a more difficult problem such as up to standard of unstable product quality, environmental protection.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, and a kind of boiling method for the preparation of bamboo wood dissolving pulp is provided, it reduces production costs, and has improved production efficiency, effectively utilizes boiling heat energy, improves output and the quality of bamboo wood dissolving pulp.
The present invention is achieved through technology.
A kind of boiling method for the preparation of bamboo wood dissolving pulp comprises following preparation process:
(a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock;
(b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis;
(c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester;
(d) hot black liquor displacement: with in the hot black liquor displacement cooking pot in the hot black liquor groove and waste liquid;
(e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp;
(f) washing black liquid displacement, washing and cooling magma;
(g) low temperature discharging.
Wherein, in the described step (a), low-pressure steam passes in the digester by steam chip distributor, and the pressure limit of low-pressure steam is 0.4Mpa～0.6Mpa.Pass into steam and can make sheet stock in the digester even and loading density is large, can also improve boiling output.Sheet stock is delivered to digester by belt conveyor.
Wherein, in the described step (b), first with the low-pressure steam heating, then with the middle pressure steam heating, make the temperature in the digester reach 170 ℃～175 ℃; The pressure limit of low-pressure steam is 0.4Mpa～0.6Mpa, and the pressure limit of middle pressure steam is 0.9Mpa～1.3Mpa; Hydrolysis is by the control of P factor, and the scope of P factor is 550 ~ 600; The scope of the total time of Steam Heating prehydrolysis is 110 minutes ~ 130 minutes.
Wherein, the displacement of described step (d) hot black liquor is specially: before temperature control white liquid is joined hot black liquor, then hot black liquor is pumped into the pump entry of digester, be pumped into top and the bottom of digester by circulating pump, carry out two-way replacement, in in the displacement cooking pot and waste liquid, replaced in and the double-edged fine-toothed comb of waste liquid by the middle part of digester cement out.
In in the temperature control hot black liquor displacement cooking pot of hot black liquor feeder and waste liquid.In order to have required alkali charge at black liquor between locomorphic stage, before temperature control, white liquid is joined hot black liquor.
Hot black liquor is pumped into the digester pump entry.Hot black liquor is assigned to digester top and bottom at the circulation delivery side of pump.In the bottom of digester, bend pipe entrance and conical entrance use simultaneously, so that cooking liquor can be diffused into the whole cross section of digester.Pass through digester middle part double-edged fine-toothed comb out with waste liquid in replaced.Two-way replacement that Here it is.Compare with traditional up-flow displacement, two-way replacement can be used sizable flow and not damage metathesis in displacement.
Wherein, described step (d) afterwards, temperature be below 100 ℃ in and waste liquid send into the washing black liquid groove, as washing black liquid, for subsequent use; Temperature be more than 100 ℃ in and waste liquid send into warm black liquor feeder, for subsequent use.Charge with the warm liquid of a waste liquid part for next pot boiling in more than 100 ℃, evaporate with the waste liquid pumping in remaining.Get back to the hot black liquor feeder with waste liquid in the heat.
Wherein, described step (e) is specially: heating adds middle pressure steam in the circulatory system by steam distributor, and in whole heating and digestion process, cooking liquor is extracted out from the double-edged fine-toothed comb at the middle part of digester, then send top and the bottom of digester back to, continuous circulation.
Heating directly adds middle pressure steam by steam distributor to be finished to the circulatory system, need not heat exchanger, therefore only needs a small amount of steam, has also avoided cleaning and the maintenance of heat exchanger simultaneously.At whole heating and digester cycle, black liquor cements out from the double-edged fine-toothed comb at digester middle part, then sends top and the bottom of digester back to.In heating process, in order to calculate mean temperature in the digester, 1 temperature survey is arranged before the black liquor pump, by 2 temperature surveys, divide to be located at top and bottom loop pipeline behind the black liquor pump.The setting of temperature meter is in order to calculate the mean temperature in the digester, to reach temperature controlled purpose.
In the boiling stage, keep required boiling temperature and pressure in the digester, until reach the H factor of target.
Wherein, described step (f) is specially: top and bottom from washing black liquid groove pumping washing black liquid to digester, replaced black liquor are from the double-edged fine-toothed comb at the middle part of digester out; Magma is washed and cool off by replacement process, make the temperature of magma be lower than 100 ℃.
In the boiling ending phase, boiling is also being carried out, and just by from washing black liquid groove pumping black liquor to digester, begins the washing black liquid displacement.The cooking liquor of heat is displaced to the hot black liquor feeder, so just stops cooking reaction.The hot black liquor that the black liquor of hot black liquor feeder is used for digester cycle afterwards adds displacement, and the black liquor that surpasses required washing black liquid displacement is sent to warm black liquor feeder.The washing black liquid displacement also is two-way replacement technique.Continuous displacement by washing black liquid reaches required dilution factor.Last pulping temperature is lower than 100 ℃.The washing black liquid displacement also is the first paragraph washing of slurry.
In the described step (c), with Na
2The O meter, the concentration 〉=90g/l of white liquid; The sulphidity of white liquid is 20%～30%.
Wherein, the Kappa number of the magma of the bamboo wood dissolving pulp that described step (e) makes is 8～10, yield 〉=36%, first kind fiber content 〉=94%, S-18(18% concentration caustic soda extract)≤3.5%, pentosan content≤2.5%.
Wherein, in the described step (e), the temperature of boiling is 170 ℃～180 ℃; The H factor of boiling is 300 ~ 400; The time of temperature control heating and boiling is 30 minutes ~ 50 minutes; With active alkali Na
2The O meter, alkali charge≤22%.
Wherein, the discharging of described step (g) low temperature is in particular: discharging is pumping blow bin under low pressure.In the discharge process, in the digester bottom, slurry is washed the black liquor dilution.Dilution can by the boiling circulating pump, mainly be to dilute the mouth of pipe to digester bottom, bend pipe entrance and conical entrance.Backwash digester middle part double-edged fine-toothed comb also can diluted slurry.By slurry being washed the dilution cooling, to satisfy the requirement of Pulping Line slurry quality temperature.Such discharge method has prevented distributing of foul gas effectively when reclaiming heat energy.
Beneficial effect of the present invention is:A kind of boiling method for the preparation of bamboo wood dissolving pulp of the present invention comprises following preparation process: (a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock; (b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis; (c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester; (d) hot black liquor displacement: with in the hot black liquor displacement cooking pot in the hot black liquor groove and waste liquid; (e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp; (f) washing black liquid displacement, washing and cooling magma; (g) low temperature discharging.
Combining super batch cooking (SuperBatch of the present invention
TM) and the advantage of Rapid Displacement Heating (Rapid Displacement Heating is abbreviated as RDH): compare with the boiling method of existing bamboo wood dissolving pulp (1), and the pulping Kappa number is low, and intensity is high; Deviating from a large number of hemicellulose and deviating from of part lignin have been realized, so when hot digestion, reduce alkali charge, the lumen of sheet stock is fully opened simultaneously, be beneficial to Extended Delignification, so Kappa number can further reduce, can reduce the destruction to alpha-cellulose, improve output and the quality of bamboo wood dissolving pulp.(2) has the sealing gas recovery system, reduce the generation of sulfurous gas, reduce the discharging of waste gas, because temperature is useed usefulness as, do not need high curing degree just can keep the viscosity of bamboo wood dissolving pulp, require lowly than the sulphidity of the boiling method of traditional bamboo wood dissolving pulp, can reduce the malodorant of sulfur-bearing to the pollution of environment.(3) yield of the magma of raising bamboo wood dissolving pulp, cooking reaction is more complete, even, greatly reduces ash-retention efficiency, and digester yield is improved.(4) displacement washing is effective, saves cost, has improved the utilization rate of heat energy, and boiling temperature is more stable, and the alkali that lowers wash engine decreases; Because residual alkali reduces, the consumption of defoamer reduces thereupon in the pulp washing process.(5) because Kappa number reduces, reduce the consumption of bleaching medicine, reduce the expense of bleaching sewage disposal.(6) consumption of saving steam has reduced production cost.(7) production process realizes full-automatic, efficient, high yield, low energy consumption, oligosaprobic production bamboo chemical dissolving pulp.
The specific embodiment
The present invention is further illustrated with specific embodiment for the below, but the present invention is not subjected to the restriction of following embodiment.
Embodiment 1.
A kind of boiling method for the preparation of bamboo wood dissolving pulp comprises following preparation process.
(a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock;
(b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis;
(c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester;
(d) hot black liquor displacement: with in the hot black liquor displacement cooking pot in the hot black liquor groove and waste liquid;
(e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp;
(f) washing black liquid displacement, washing and cooling magma;
(g) low temperature discharging.
Wherein, in the described step (a), low-pressure steam passes in the digester by steam chip distributor, and the pressure of low-pressure steam is 0.5Mpa.
Wherein, in the described step (b), first with the low-pressure steam heating, then with the middle pressure steam heating, make the temperature in the digester reach 170 ℃; The pressure of low-pressure steam is 0.5Mpa, and the pressure of middle pressure steam is 1.0Mpa; Hydrolysis is by the control of P factor, and the P factor is 600; The total time of Steam Heating prehydrolysis be 130 minutes.
Wherein, in the described step (c), with Na
2The O meter, the concentration 〉=97g/l of white liquid; The sulphidity of white liquid is 25%.
Wherein, the displacement of described step (d) hot black liquor is specially: before temperature control white liquid is joined hot black liquor, then hot black liquor is pumped into the pump entry of digester, carry out two-way replacement: hot black liquor is delivered to top and the bottom of digester by the circulation delivery side of pump, in in the displacement cooking pot and waste liquid, replaced in and the double-edged fine-toothed comb of waste liquid by the middle part of digester cement out.
Wherein, in the described step (d), temperature be below 100 ℃ in and waste liquid send into the washing black liquid groove, as washing black liquid, for subsequent use; Temperature be more than 100 ℃ in and waste liquid send into warm black liquor feeder, for subsequent use.
Wherein, described step (e) is specially: heating adds middle pressure steam in the circulatory system by steam distributor, and in whole heating and digestion process, cooking liquor is extracted out from the double-edged fine-toothed comb at the middle part of digester, then send top and the bottom of digester back to, continuous circulation.
Wherein, in the described step (e), the temperature of boiling is 180 ℃; The H factor of boiling is 400; The time of temperature control heating and boiling is 50 minutes; With active alkali Na
2The O meter, alkali charge is 22%.
Wherein, the Kappa number of the magma of the bamboo wood dissolving pulp that described step (e) makes is 8～10, yield 36% ~ 38%, first kind fiber content is 94% ~ 95%, S-18(18% concentration caustic soda extract) and be 3.0% ~ 3.5%, pentosan content is 2.0% ~ 2.5%.
Wherein, described step (f) is specially: top and bottom from washing black liquid groove pumping washing black liquid to digester, replaced black liquor are from the double-edged fine-toothed comb at the middle part of digester out; Magma is washed and cool off by replacement process, make the temperature of magma be lower than 100 ℃.
Embodiment 2.
A kind of boiling method for the preparation of bamboo wood dissolving pulp comprises following preparation process.
(a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock;
(b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis;
(c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester;
(d) hot black liquor displacement: with in the hot black liquor displacement cooking pot in the hot black liquor groove and waste liquid;
(e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp;
(f) washing black liquid displacement, washing and cooling magma;
(g) low temperature discharging.
Wherein, in the described step (a), low-pressure steam passes in the digester by steam chip distributor, and the pressure of low-pressure steam is 0.4Mpa.
Wherein, in the described step (b), first with the low-pressure steam heating, then with the middle pressure steam heating, make the temperature in the digester reach 173 ℃; The pressure of low-pressure steam is 0.4Mpa, and the pressure of middle pressure steam is 0.9Mpa; Hydrolysis is by the control of P factor, and the P factor is 600; The total time of Steam Heating prehydrolysis be 130 minutes.
Wherein, in the described step (c), with Na
2The O meter, the concentration of white liquid is 97g/l; The sulphidity of white liquid is 25%.
Wherein, the displacement of described step (d) hot black liquor is specially: before temperature control white liquid is joined hot black liquor, then hot black liquor is pumped into the pump entry of digester, carry out two-way replacement: hot black liquor is delivered to top and the bottom of digester by the circulation delivery side of pump, in in the displacement cooking pot and waste liquid, replaced in and the double-edged fine-toothed comb of waste liquid by the middle part of digester cement out.
Wherein, in the described step (d), temperature be below 100 ℃ in and waste liquid send into the washing black liquid groove, as washing black liquid, for subsequent use; Temperature be more than 100 ℃ in and waste liquid send into warm black liquor feeder, for subsequent use.
Wherein, described step (e) is specially: heating adds middle pressure steam in the circulatory system by steam distributor, and in whole heating and digestion process, cooking liquor is extracted out from the double-edged fine-toothed comb at the middle part of digester, then send top and the bottom of digester back to, continuous circulation.
Wherein, the Kappa number of the magma of the bamboo wood dissolving pulp that described step (e) makes is 8 ~ 9, and yield is 38% ~ 42%, and first kind fiber content is 94.5% ~ 96%, S-18(18% concentration caustic soda extract) be 1.5% ~ 2.5%, pentosan content is 2.0% ~ 2.5%.
Wherein, in the described step (e), the temperature of boiling is 173 ℃; The H factor of boiling is 400; The time of temperature control heating and boiling is 45 minutes; With active alkali Na
2The O meter, alkali charge is 21%.
Wherein, described step (f) is specially: top and bottom from washing black liquid groove pumping washing black liquid to digester, replaced black liquor are from the double-edged fine-toothed comb at the middle part of digester out; Magma is washed and cool off by replacement process, make the temperature of magma be lower than 100 ℃.
Embodiment 3.
A kind of boiling method for the preparation of bamboo wood dissolving pulp comprises following preparation process.
(a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock;
(b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis;
(c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester;
(d) hot black liquor displacement: with in the hot black liquor displacement cooking pot in the hot black liquor groove and waste liquid;
(e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp;
(f) washing black liquid displacement, washing and cooling magma;
(g) low temperature discharging.
Wherein, in the described step (a), low-pressure steam passes in the digester by steam chip distributor, and the pressure of low-pressure steam is 0.5Mpa.
Wherein, in the described step (b), first with the low-pressure steam heating, then with the middle pressure steam heating, make the temperature in the digester reach 170 ℃; The pressure of low-pressure steam is 0.5Mpa, and the pressure of middle pressure steam is 1.0Mpa; Hydrolysis is by the control of P factor, and the P factor is 550; The total time of Steam Heating prehydrolysis be 120 minutes.
Wherein, in the described step (c), with Na
2The O meter, the concentration of white liquid is 90g/l; The sulphidity of white liquid is 22%.
Wherein, the displacement of described step (d) hot black liquor is specially: before temperature control white liquid is joined hot black liquor, then hot black liquor is pumped into the pump entry of digester, carry out two-way replacement: hot black liquor is delivered to top and the bottom of digester by the circulation delivery side of pump, in in the displacement cooking pot and waste liquid, replaced in and the double-edged fine-toothed comb of waste liquid by the middle part of digester cement out.
Wherein, in the described step (d), temperature be below 100 ℃ in and waste liquid send into the washing black liquid groove, as washing black liquid, for subsequent use; Temperature be more than 100 ℃ in and waste liquid send into warm black liquor feeder, for subsequent use.
Wherein, described step (e) is specially: heating adds middle pressure steam in the circulatory system by steam distributor, and in whole heating and digestion process, cooking liquor is extracted out from the double-edged fine-toothed comb at the middle part of digester, then send top and the bottom of digester back to, continuous circulation.
Wherein, the Kappa number of the magma of the bamboo wood dissolving pulp that described step (e) makes is 9 ~ 10, and yield is 37% ~ 40%, and first kind fiber content is 94% ~ 95%, S-18(18% concentration caustic soda extract) be 3.0% ~ 3.5%, pentosan content is 1% ~ 2.5%.
Wherein, in the described step (e), the temperature of boiling is 170 ℃; The H factor of boiling is 300; The time of temperature control heating and boiling is 40 minutes; With active alkali Na
2The O meter, alkali charge is 20%.
Wherein, described step (f) is specially: top and bottom from washing black liquid groove pumping washing black liquid to digester, replaced black liquor are from the double-edged fine-toothed comb at the middle part of digester out; Magma is washed and cool off by replacement process, make the temperature of magma be lower than 100 ℃.
Embodiment 4.
A kind of boiling method for the preparation of bamboo wood dissolving pulp comprises following preparation process.
(a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock;
(b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis;
(c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester;
(d) hot black liquor displacement: with in the hot black liquor displacement cooking pot in the hot black liquor groove and waste liquid;
(e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp;
(f) washing black liquid displacement, washing and cooling magma;
(g) low temperature discharging.
Wherein, in the described step (a), low-pressure steam passes in the digester by steam chip distributor, and the pressure of low-pressure steam is 0.6Mpa.
Wherein, in the described step (b), first with the low-pressure steam heating, then with the middle pressure steam heating, make the temperature in the digester reach 171 ℃; The pressure of low-pressure steam is 0.6Mpa, and the pressure of middle pressure steam is 1.2Mpa; Hydrolysis is by the control of P factor, and the P factor is 560; The total time of Steam Heating prehydrolysis be 120 minutes.
Wherein, in the described step (c), with Na
2The O meter, the concentration of white liquid is 96g/l; The sulphidity of white liquid is 25%.
Wherein, the displacement of described step (d) hot black liquor is specially: before temperature control white liquid is joined hot black liquor, then hot black liquor is pumped into the pump entry of digester, carry out two-way replacement: hot black liquor is delivered to top and the bottom of digester by the circulation delivery side of pump, in in the displacement cooking pot and waste liquid, replaced in and the double-edged fine-toothed comb of waste liquid by the middle part of digester cement out.
Wherein, in the described step (d), temperature be below 100 ℃ in and waste liquid send into the washing black liquid groove, as washing black liquid, for subsequent use; Temperature be more than 100 ℃ in and waste liquid send into the hot black liquor feeder, for subsequent use.
Wherein, described step (e) is specially: heating adds middle pressure steam in the circulatory system by steam distributor, and in whole heating and digestion process, cooking liquor is extracted out from the double-edged fine-toothed comb at the middle part of digester, then send top and the bottom of digester back to, continuous circulation.
Wherein, the Kappa number of the magma of the bamboo wood dissolving pulp that described step (e) makes is 9 ~ 10, and yield is 36% ~ 39%, and first kind fiber content is 96% ~ 99%, S-18(18% concentration caustic soda extract) be 1% ~ 2%, pentosan content is 1.5% ~ 2%.
Wherein, in the described step (e), the temperature of boiling is 175 ℃; The H factor of boiling is 340; The time of temperature control heating and boiling is 30 minutes; With active alkali Na
2The O meter, alkali charge is 20%.
Wherein, described step (f) is specially: top and bottom from washing black liquid groove pumping washing black liquid to digester, replaced black liquor are from the double-edged fine-toothed comb at the middle part of digester out; Magma is washed and cool off by replacement process, make the temperature of magma be lower than 100 ℃.
Embodiment 5.
A kind of boiling method for the preparation of bamboo wood dissolving pulp comprises following preparation process.
(a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock;
(b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis;
(c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester;
(d) hot black liquor displacement: with in the hot black liquor displacement cooking pot in the hot black liquor groove and waste liquid;
(e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp;
(f) washing black liquid displacement, washing and cooling magma;
(g) low temperature discharging.
Wherein, in the described step (a), low-pressure steam passes in the digester by steam chip distributor, and the pressure of low-pressure steam is 0.6Mpa.
Wherein, in the described step (b), first with the low-pressure steam heating, then with the middle pressure steam heating, make the temperature in the digester reach 174 ℃; The pressure of low-pressure steam is 0.6Mpa, and the pressure of middle pressure steam is 1.3Mpa; Hydrolysis is by the control of P factor, and the P factor is 580; The total time of Steam Heating prehydrolysis be 130 minutes.
Wherein, in the described step (c), with Na
2The O meter, the concentration of white liquid is 98g/l; The sulphidity of white liquid is 30%.
Wherein, the displacement of described step (d) hot black liquor is specially: before temperature control white liquid is joined hot black liquor, then hot black liquor is pumped into the pump entry of digester, carry out two-way replacement: hot black liquor is delivered to top and the bottom of digester by the circulation delivery side of pump, in in the displacement cooking pot and waste liquid, replaced in and the double-edged fine-toothed comb of waste liquid by the middle part of digester cement out.
Wherein, in the described step (d), temperature be below 100 ℃ in and waste liquid send into the washing black liquid groove, as washing black liquid, for subsequent use; Temperature be more than 100 ℃ in and waste liquid send into warm black liquor feeder, for subsequent use.
Wherein, described step (e) is specially: heating adds middle pressure steam in the circulatory system by steam distributor, and in whole heating and digestion process, cooking liquor is extracted out from the double-edged fine-toothed comb at the middle part of digester, then send top and the bottom of digester back to, continuous circulation.
Wherein, the Kappa number of the magma of the bamboo wood dissolving pulp that described step (e) makes is 10, and yield is 40% ~ 42%, and first kind fiber content is 96% ~ 98%, S-18(18% concentration caustic soda extract) be 2% ~ 3.5%, pentosan content is 1.5% ~ 2.5%.
Wherein, in the described step (e), the temperature of boiling is 180 ℃; The H factor of boiling is 380; The time of temperature control heating and boiling is 50 minutes; With active alkali Na
2The O meter, alkali charge is 19%.
Wherein, described step (f) is specially: top and bottom from washing black liquid groove pumping washing black liquid to digester, replaced black liquor are from the double-edged fine-toothed comb at the middle part of digester out; Magma is washed and cool off by replacement process, make the temperature of magma be lower than 100 ℃.
The above embodiment, it is preferred embodiments of the present invention, be not to limit the scope of the present invention, so all equivalences of doing according to the described structure of the present patent application claim, feature and principle change or modify, all should comprise in the patent claim of the present invention.
Claims (1)
1. boiling method for the preparation of bamboo wood dissolving pulp is characterized in that: comprise following preparation process:
(a) steam dress pot: bamboo material is made sheet stock, be delivered to digester, pass into low-pressure steam toward digester when carrying sheet stock; Low-pressure steam passes in the digester by steam chip distributor, and the pressure limit of low-pressure steam is 0.4MPa～0.6MPa;
(b) Steam Heating prehydrolysis: after steam dress pot is finished, use Steam Heating, make sheet stock prehydrolysis; With the low-pressure steam heating, then with the middle pressure steam heating, make the temperature in the digester reach 170 ℃～175 ℃ first; The pressure limit of low-pressure steam is 0.4MPa～0.6MPa, and the pressure limit of middle pressure steam is 0.9MPa～1.3MPa; Hydrolysis is by the control of P factor, and the scope of P factor is 550 ~ 600; The scope of the total time of Steam Heating prehydrolysis is 110 minutes ~ 130 minutes;
(c) white liquid neutralization: use in the white liquid in the white liquid bath of heat and sheet stock and steam condensate (SC) in the digester; With Na
2The O meter, the concentration 〉=90g/l of white liquid; The sulphidity of white liquid is 20%～30%;
(d) hot black liquor displacement: white liquid is joined hot black liquor, then hot black liquor is pumped into the pump entry of digester, be pumped into top and the bottom of digester by circulating pump, carry out two-way replacement, in in the displacement cooking pot and waste liquid, replaced in and the double-edged fine-toothed comb of waste liquid by the middle part of digester cement out; Temperature be below 100 ℃ in and waste liquid send into the washing black liquid groove, as washing black liquid, for subsequent use; Temperature be more than 100 ℃ in and waste liquid send into warm black liquor feeder, for subsequent use;
(e) temperature control is heated and boiling, makes the magma of bamboo wood dissolving pulp; The temperature of boiling is 170 ℃～180 ℃; The H factor of boiling is 300 ~ 400; The time of temperature control heating and boiling is 30 minutes ~ 50 minutes; With active alkali Na
2The O meter, alkali charge≤22%; Heating adds middle pressure steam in the circulatory system by steam distributor, and in whole heating and digestion process, cooking liquor is extracted out from the double-edged fine-toothed comb at the middle part of digester, then sends top and the bottom of digester back to, continuous circulation; The Kappa number of the magma of the bamboo wood dissolving pulp that makes is 8～10, yield 〉=36%, first kind fiber content 〉=94%, S-18≤3.5%, pentosan content≤2.5%;
(f) washing black liquid displacement, washing and cooling magma; Be specially: top and bottom from washing black liquid groove pumping washing black liquid to digester, replaced black liquor are from the double-edged fine-toothed comb at the middle part of digester out; Magma is washed and cool off by replacement process, make the temperature of magma be lower than 100 ℃;
(g) low temperature discharging.
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| CN102926260A (en) * | 2012-11-26 | 2013-02-13 | 天津市恒脉机电科技有限公司 | Liquid replacing system of replacing and cooking pot |
| CN102936862A (en) * | 2012-11-26 | 2013-02-20 | 天津市恒脉机电科技有限公司 | System for producing pulp through intermittent replacement and stewing |
| CN103317572A (en) * | 2013-05-29 | 2013-09-25 | 台州金晟环保制品有限公司 | Dry-process molding product bamboo fiber manufacturing method |
| CN103255660B (en) * | 2013-05-31 | 2015-12-02 | 台州学院 | A kind of technique extracting mao bamboon fiber |
| US11142589B2 (en) | 2019-06-14 | 2021-10-12 | Bracell Bahia Specialty Cellulose SA | High alpha and high intrinsic viscosity pulp production apparatuses, methods and systems |
| BR112021025188A8 (en) * | 2019-06-14 | 2022-03-15 | Bracell Bahia Specialty Cellulose S A | Apparatus, methods and systems for producing high-alpha, high-intrinsic-viscosity pulp |
| CN110983848A (en) * | 2019-11-06 | 2020-04-10 | 福建省青山纸业股份有限公司 | Preparation process of bamboo unbleached pulp |
| CN110904710A (en) * | 2019-11-06 | 2020-03-24 | 福建省青山纸业股份有限公司 | Bamboo pulp preparation process |
| CN111021121A (en) * | 2019-11-06 | 2020-04-17 | 福建省青山纸业股份有限公司 | Production method for directly converting natural-color chemical KP pulp on dissolving pulp DP production line |
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| CN101235547A (en) * | 2008-03-06 | 2008-08-06 | 北京林业大学 | Method for producing bamboo dissolving pulp |
| CN102127877A (en) * | 2010-12-28 | 2011-07-20 | 宜宾竹海竹资源科技有限责任公司 | Production process of bamboo-dissolving pulp |
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| CN101235547A (en) * | 2008-03-06 | 2008-08-06 | 北京林业大学 | Method for producing bamboo dissolving pulp |
| CN102127877A (en) * | 2010-12-28 | 2011-07-20 | 宜宾竹海竹资源科技有限责任公司 | Production process of bamboo-dissolving pulp |
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