CN115305738A - LCP cleaning pulping method - Google Patents
LCP cleaning pulping method Download PDFInfo
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- CN115305738A CN115305738A CN202211006936.6A CN202211006936A CN115305738A CN 115305738 A CN115305738 A CN 115305738A CN 202211006936 A CN202211006936 A CN 202211006936A CN 115305738 A CN115305738 A CN 115305738A
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- 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
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
- D21C3/022—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing compounds
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- 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
- D21C3/22—Other features of pulping processes
- D21C3/222—Use of compounds accelerating the pulping processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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Abstract
The invention provides an LCP cleaning pulping method which comprises an S1-normal temperature materialization pretreatment section, an S2-low temperature rapid cooking section and an S3-fluffing treatment section. The method provided by the invention is in the critical zone of semi-chemical pulping and chemical pulping. Compared with semi-chemical pulping, the pulping method reduces mechanical energy consumption; compared with chemical pulping, the pulping method of the invention shortens the cooking time, reduces the thermal energy consumption, reduces the chemical consumption and improves the yield.
Description
Technical Field
The invention relates to the field of light industry science and engineering, in particular to an LCP cleaning pulping method taking bast fibers or vein fibers as raw materials.
Background
The papermaking technique is one of four inventions in China, and is an outstanding invention creation in the human civilization history. The papermaking raw materials (paper raw materials) are mainly divided into plant fiber raw materials and non-plant fiber raw materials, wherein the plant fiber raw materials mainly comprise wood fiber raw materials, grass fiber raw materials, bast fiber raw materials, vein fiber raw materials, hair fiber raw materials and the like; the non-plant fiber raw materials mainly comprise synthetic fiber raw materials, inorganic fiber raw materials and the like. Conventional plant fiber pulping processes typically include: mechanical pulping (mechanical pulping), which is a process of obtaining pulp fibers from a paper-making raw material by using mechanical force, can be classified into general mechanical methods, thermomechanical methods, refining mechanical methods, and the like; chemical Pulping (Chemical Pulping) -pulp fibers are obtained from paper-making raw materials by using chemicals, and the pulp fibers are commonly used in two major types, namely alkaline Pulping and sulfite Pulping; semi-chemical Pulping (chemical Pulping), which utilizes the synergistic effect of mechanical force and chemicals to obtain pulp fibers from paper-making raw materials, can be classified into a neutral semi-chemical method, a cold soda method, a chemical mechanical method and the like. With the development of pulping technology, new methods such as biological pulping method, solvent pulping method, oxygen-alkali pulping method and the like are developed on the basis of the traditional pulping method.
At present, the traditional chemical pulping method is basically adopted in the pulping method taking bast fibers or vein (stalk) fibers as raw materials, and the raw materials for papermaking mainly comprise hemp peels, flax peels, jute peels, ramie peels, abaca peels, kenaf peels, paper mulberry barks, manila hemp, rattan barks, sandalwood barks, mulberry barks, cotton stalk barks, palm leaf stalks, oil palm empty fruit bunches, sisal hemp, pineapple leaves, fragrant coke barks and the like. However, the traditional chemical pulping method has the problems of large chemical dosage, high cooking temperature, long cooking time, low pulping yield, large wastewater pollution load and the like.
The inventor of the application aims at providing an environment-friendly LCP (Light Chemical Pulping) clean Pulping method by taking factors such as energy consumption, material consumption, time consumption, environmental protection and the like of bast fiber or vein (stalk) fiber raw materials in the Pulping process into consideration of the Pulping quality and yield.
Disclosure of Invention
The invention aims to provide an LCP clean pulping method, which achieves the pulping aim by adopting the technical procedures of normal-temperature physicochemical pretreatment, low-temperature quick cooking, mechanical defibering and the like.
In order to achieve the above object, the present invention adopts the following technical solutions.
In one aspect, the present invention provides a LCP cleaning pulping process, the process comprising the steps of:
s1-normal temperature physicochemical pretreatment stage: cutting the raw materials, removing dust and impurities, placing the raw materials into a container, adding a presoaking agent and water into the container, soaking for 20-30 hours at room temperature, removing impurities, and draining for later use;
s2-low-temperature quick cooking section: adding a cooking agent into the material obtained in the step S1, stirring and mixing uniformly, and then putting into a reactor for cooking;
s3, a fluffing treatment section: and (3) immediately putting the material obtained in the step (S2) into a pot, cooling, extracting black liquor, washing, and then, entering high-speed defibering equipment for medium-high concentration mechanical treatment to disperse and dissociate material fibers into slurry.
Preferably, in step S1, the raw material is a bast-type fiber or vein-type fiber raw material, more preferably, the raw material is one or more selected from the group consisting of hemp bark, flax bark, jute bark, abaca bark, kenaf bark, abaca bark, sandalwood bark, mulberry bark, cotton stalk bark, palm petiole, oil palm empty fruit cluster, sisal, pineapple leaf and balsamic bark; further preferably, the bast-type fibers are selected from sandalwood bark, paper mulberry bark and mulberry bark; the vein fibers are selected from sisal, pineapple leaves and palm petioles;
preferably, in step S1, the chopping is to chop the raw material to a length of 15cm or less, more preferably to chop the raw material to a length of 3 to 5cm;
preferably, in step S1, when the raw material is bast-type fiber, the pre-impregnant is selected from NaOH and Na 2 SO 3 And Ca (OH) 2 More preferably, the pre-impregnant consists of NaOH and Na 2 SO 3 Consisting of, or consisting of NaOH and Ca (OH) 2 Composition is carried out; further preferably, the pre-infusion is 2-3% NaOH and 1-2% Na 2 SO 3 Consisting of, or consisting of 2-3% NaOH and 1-2% Ca (OH) 2 Composition is carried out; wherein the percentage is the percentage relative to the oven dry mass of the raw materials;
preferably, in step S1, when the raw material is vein fiber, the pre-infusion is selected from NaOH and Na 2 SO 3 、Ca(OH) 2 And Na 3 PO 4 More preferably, the pre-preg consists of Ca (OH) 2 And Na 2 SO 3 Consisting of, or consisting of NaOH and Ca (OH) 2 Is composed of NaOH and Ca (OH) 2 And Na 3 PO 4 Composition is carried out; further preferably, the pre-infusion is 1-2% Ca (OH) 2 And 1-2% of Na 2 SO 3 Consisting of, or consisting of 1-3% NaOH and 1-2% Ca (OH) 2 Consisting of, or consisting of 1-3% NaOH, 1-2% Ca (OH) 2 And 1-2% of Na 3 PO 4 Composition is carried out; wherein the percentage is relative to the oven dry mass of the raw materials;
preferably, in step S1, the total amount of said pre-impregnant is 1 to 5%, more preferably 3 to 4%, relative to the oven-dried mass of the raw material;
preferably, in step S1, the water is used in an amount based on the immersion raw material;
preferably, the impurities are removed such as dissolved matters, cuticle keratin, sand and stones;
preferably, in step S2, the cooking agent comprises a compound selected from NaOH, na 3 PO 4 、AQ(C 14 H 8 O 2 )、H 2 O 2 DTPA, lbO, KOH and Ca (OH) 2 One or more of; more preferably, in step S2, the cooking chemical comprises NaOH, na, in an amount selected from the group consisting of 1% to 12%, 1% to 8% 3 PO 4 、0～0.06％AQ(C 14 H 8 O 2 )、0～4％H 2 O 2 0-2% DTPA, 0-0.2% green oxygen, 1-12% KOH and 1-12% Ca (OH) 2 One or more of (a); more preferably, the cooking agent comprises NaOH, na, in an amount selected from the group consisting of 8% to 10%, 1% to 3% 3 PO 4 、0～0.05％AQ(C 14 H 8 O 2 )、0～2％H 2 O 2 0-1% DTPA, 0-0.08% green oxygen, 1-2% KOH and 1-2% Ca (OH) 2 One or more of (a); wherein the percentage is the percentage relative to the oven dry mass of the raw materials;
preferably, in step S2, when the raw material is bast-type fiber, the cooking agent comprises NaOH or Na 3 PO 4 、AQ(C 14 H 8 O 2 )、H 2 O 2 One or more of DTPA and green oxygen; more preferably, the cooking chemical comprises NaOH in an amount selected from the group consisting of 1% to 12%, na in an amount selected from the group consisting of 1% to 8% 3 PO 4 、0～0.06％AQ(C 14 H 8 O 2 )、0～4％H 2 O 2 0-2% of one or more of DTPA and 0-0.2% of green oxygen; more preferably, the cooking chemical comprises NaOH, 1-3% Na selected from 8-10% 3 PO 4 、0～0.05％AQ(C 14 H 8 O 2 )、0～2％H 2 O 2 0 to 1% of DTPA and 0 to 0.08% of green oxygen;
preferably, in step S2, when the raw material is bast fiber, the cooking agent is selected from NaOH and Na 3 PO 4 And AQ; more preferably 8% to 10% NaOH, 1% to 3% Na 3 PO 4 And 0 to 0.05% by weight of AQ; even more preferably by 10% NaOH, 3% Na 3 PO 4 And 0.05% aq composition;
preferably, in step S2, when the raw material is bast fiber, the cooking agent is selected from NaOH and H 2 O 2 And DTPA; more preferably 8% to 10% NaOH, 0 to 2% 2 O 2 And 0-1% DTPA; even more preferably by 10% NaOH, 2% 2 O 2 And 1% of DTPA composition;
preferably, in step S2, when the raw material is bast-type fiber, the cooking chemical is composed of NaOH and green oxygen; further preferably 8% to 10% by weight of NaOH and 0 to 0.08% by weight of green oxygen; even more preferably 8% NaOH and 0.08% Green oxygen;
preferably, in step S2, when the raw material is vein-like fiber, the cooking chemical comprises a chemical selected from NaOH, KOH, AQ, ca (OH) 2 And Na 3 PO 4 One or more of (a); further preferably comprises a content selected from 1% to 12% NaOH, 1% to 12% KOH,0 to 0.06% AQ, 1% to 12% Ca (OH) 2 And 1% to 8% of Na 3 PO 4 One or more of (a); more preferably, it comprises a concentration selected from 8% to 10% of NaOH, 1% to 2% of KOH, 0% to 0.05% of AQ, 1% to 2% of Ca (OH) 2 And 1% to 3% of Na 3 PO 4 One or more of;
preferably, in step S2, when the raw material is vein-like fiber, the cooking chemical consists of NaOH, KOH and AQ; more preferably 8% to 10% NaOH, 1% to 2% KOH and 0% to 0.05% AQ; even more preferably by 8% NaOH, 2% KOH and 0.05% AQ;
preferably, in step S2, when the raw material is vein fiber, the cooking medicament is NaOH, ca (OH) 2 And AQ; more preferably, the content of NaOH, 1% to 2% by weight, ca (OH) 2 And 0 to 0.05% by weight of AQ; even more preferably 8% NaOH, 2% Ca (OH) 2 And 0.05% aq composition;
preferably, in step S2, when the raw material is vein fiber, the cooking agent is NaOH or Na 3 PO 4 And AQ; more preferably 8% to 10% NaOH, 1% to 3% Na 3 PO 4 And 0 to 0.05% aq; even more preferably by 10% NaOH, 3% Na 3 PO 4 And 0.05% aq composition;
preferably, in step S2, the method further comprises the operation of adding water according to the ratio of 1:3 to 1:8, more preferably according to a ratio of 1:4 to 1:4.5 liquid ratio; wherein the liquid ratio refers to the ratio of the absolute dry amount of the raw materials to the added water amount;
preferably, in step S2, the cooking further comprises a cooking stage I and a cooking stage II; further preferably, the cooking stage I is to heat the mixture from a normal temperature to an intermediate temperature within 60min, preferably 40-50 min, and then keep the temperature for 30-60 min, wherein the intermediate temperature is not more than 135 ℃, and more preferably 110-125 ℃;
preferably, the cooking stage II is carried out within 30min, preferably within 20-30 min, by raising the temperature from the medium temperature to a maximum temperature, which is not more than 160 ℃, more preferably 150-155 ℃, and then holding for 60-90 min.
In another aspect, the present invention also provides a virgin pulp obtained by the LCP clean pulping process described above.
In still another aspect, the invention also provides the use of the LCP clean pulping method in pulping and papermaking engineering.
The LCP clean pulping method provided by the invention adopts the technical procedures of normal-temperature physicochemical pretreatment, low-temperature quick cooking, mechanical defibering and the like to achieve the pulping purpose. Firstly, in the method of the invention, a pre-impregnant is adopted to impregnate and mechanically pre-treat a bast fiber or vein fiber raw material with a certain length at normal temperature, so that most of non-fibrous impurities such as pectin, easily-soluble substances, a small part of semi-fibers, sand and stone and the like in the raw material are removed, and meanwhile, the medicament permeates and softens intercellular layers. Then, the pectin, the lignin in the intercellular layer and most of the hemicellulose bonded on the surface of the cellulose microfibril are dissolved out by low-temperature quick cooking through compounding a cooking medicament. Finally, mechanical treatment is carried out by defibering equipment, so that the fibers are dispersed and dissociated into pulp.
The pulping method provided by the invention is in the critical area of semi-chemical pulping and chemical pulping. Compared with the semi-chemical pulping method, the pulping method reduces the mechanical energy consumption; compared with chemical pulping, the pulping method of the invention shortens the cooking time, reduces the thermal energy consumption, reduces the chemical consumption and improves the yield. The performance of the pulp prepared by the method is close to the level of the pulp prepared by chemical pulping.
However, the COD and BOD contents of the pulping waste liquid generated by the method provided by the invention are far lower than those of the pulping waste liquid generated by a chemical method, and the pulping waste water is easy to be treated by a biological method and is alkalescent. The waste water can prevent soil hardening, is suitable for irrigating acid soil lacking phosphorus, potassium and calcium, and can easily generate monocalcium phosphate Ca (H) in the soil 2 PO 4 ) 2 KH potassium dihydrogen phosphate 2 PO 4 Ca (NO), ca nitrate 3 ) 2 And the like soil nutrients.
Therefore, compared with the existing pulping method, the LCP cleaning pulping method provided by the invention at least comprises the following advantages:
1. the method can produce the primary pulp of bast fiber or vein fiber raw materials with high performance and high yield, the performance of the primary pulp basically reaches the level of the pulp of a chemical method, and the yield of the finished pulp can be improved by more than 20 percent compared with the yield of the pulp of the chemical method.
2. Compared with the chemical pulping method, the pulping method has the advantages that the highest temperature is reduced, the cooking time is shortened, the consumption of chemicals is reduced by about 40 percent, and the pollution load of waste water is greatly reduced.
3. The method is an environment-friendly pulping method, the discharged wastewater is easy to be treated by a biological method, the wastewater can prevent soil from hardening, the method is suitable for irrigating acid soil lacking phosphorus, potassium and calcium, and monocalcium phosphate Ca (H) is easy to generate in the soil 2 PO 4 ) 2 KH potassium dihydrogen phosphate 2 PO 4 Ca (NO), ca nitrate 3 ) 2 And the like soil nutrients.
Detailed Description
The invention is illustrated below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.
The experimental procedures in the following examples are all conventional ones unless otherwise specified. The raw materials and reagent materials used in the following examples are all commercially available products unless otherwise specified. Wherein, the purchase condition of part of the reagents is as follows:
calcium hydroxide, sodium hydroxide, potassium hydroxide, chloroxol, calcium oxide, sodium phosphate, diethylenetriaminepentaacetic acid and other chemicals are purchased from Tianjin Damao chemical reagent factory; anhydrous sodium sulfite is purchased from chemical reagent factories of Fuchen, tianjin; sodium dodecyl benzene sulfonate was purchased from Shanghai Lingfeng Chemicals Co., ltd; the anthraquinone brand is aladine.
Example 1Cutting three-stage sisal hemp into pieces with length of 50mm, metering, and placing in a pretreatment container (barrel or pool); weighing Ca (OH) 2% by mass of prepared sisal hemp raw material (the same below) 2 And 2% by mass of Na 2 SO 3 Placing in a dissolver, adding a certain amount of clear water to dissolve the medicine, and pouring the dissolved solution into a preprocessor; adding clear water into the preprocessor to immerse the raw materialProperly and uniformly stirring, soaking and pretreating for 30 hours at room temperature, and draining the raw materials pretreated at the normal temperature for later use;
according to the liquid ratio (absolute dry amount of raw materials: water addition amount) of 1:4 metering the required fresh water, dissolving 8% NaOH and 2% KOH as previously described for dissolving the chemicals, then pouring the dissolved solution and 0.05% AQ evenly into the reactor; sealing the reactor and entering a cooking section, wherein the cooking section is divided into two stages, the stage I is to heat up to 120 ℃ from normal temperature, the heating time is controlled to be 40min, and the temperature is kept at 120 ℃ for 30min; in the stage II, the temperature is raised from 120 ℃ to 155 ℃, the heating time is controlled to be 20min, and the temperature is kept at 155 ℃ for 60min; after the cooking section is finished, the material in the reactor is put into a boiler (is sprayed under pressure or is poured after being cooled), then a thick black liquor extraction and slurry washing section is carried out, and finally the slurry is subjected to high-speed defibering equipment for medium-high concentration mechanical treatment, so that the fiber of the cooked material is dispersed and dissociated into the slurry.
Examples 2 to 6
The materials used in examples 2, 3, 4, 5 and 6 have different lengths, generally varying from 30mm to 50mm, and the basic process of each example is as described in example 1, but the steps of the examples are different in terms of pre-impregnation, pretreatment time, cooking chemicals, liquor ratio, temperature program, and the like, and the specific reagents and conditions involved in the steps of each example are as shown in table 1 below:
table 1: process conditions used in examples 1 to 6
Example 7:
the raw slurries prepared in examples 1-6 were tested, wherein: kappa number was determined according to GBT 1546-2018;
the intrinsic viscosity is measured according to GB/T1548-2016;
CODcr was determined as HJ 828-2017;
BOD 5 determined according to HJ 505-2009;
the measurement results are shown in table 2 below:
table 2: test results of examples 1 to 6
Example 8:
the same three-stage sisal hemp raw material as used in example 1 was used, and the raw material was directly charged into a reactor without cutting (length greater than 800 mm) and without a pretreatment stage after metering; the amount of chemicals used in the cooking stage was the sum of the amounts of chemicals used in the pretreatment stage and the cooking stage of example 1 (i.e.: 8% NaOH 2%, KOH,2% Ca (OH) 2 ，2％Na 2 SO 3 0.05% AQ). Pulping according to the same processes of liquid ratio, cooking condition, subsequent treatment and the like as the example 1, and compared with the example 1, the obtained pulp has more coarse residues and is difficult to defiber. The results are shown in Table 3.
Example 9:
the same three-stage sisal hemp raw material used in the example 1 is adopted, the cutting treatment of the raw material is also the same as the example 1, and the raw material is directly loaded into a reactor without a pretreatment section after metering; the amount of chemicals used in the cooking stage was the same as in the cooking stage of example 1 (i.e.: 8% NaOH 2% KOH,0.05% AQ), i.e. the pretreatment stage of example 1 was eliminated, including the pretreatment agents used and the pretreatment time. The pulp is prepared by the processes of liquid ratio, cooking condition, subsequent treatment and the like which are the same as those of the example 1, compared with the example 1, the obtained pulp has more coarse residues and difficult disintegration, and the good pulp has fiber bundle fragments which are not boiled. The results are shown in Table 3.
Example 10:
the process conditions of raw materials, cutting degree, pretreatment section process, pretreatment agent, cooking agent dosage of the cooking section and the like are completely the same as those of the embodiment 1, only the temperature rise program in the cooking process is changed, namely, two cooking stages in the embodiment 1 are combined into one stage, the total time consumption is kept the same, namely, the temperature is raised from the normal temperature for 60min to 155 ℃, and the temperature is kept for 90min. The obtained slurry has a slightly better effect than that of the slurry in the example 8, but the coarse slag and the difficulty degree of fluffing are obviously different from those of the slurry in the example 1, and the color of the slurry is slightly reddish. The results are shown in Table 3.
From the comparison of the pulping processes and results of the examples 1, 8, 9 and 10, the pulping effects are in the order of good to bad: example 1 >.
Table 3: test results of examples 8 to 10
The above description of the embodiments of the present invention is not intended to limit the present invention, and those skilled in the art may make various changes and modifications without departing from the spirit of the present invention, which should fall within the scope of the appended claims.
Claims (10)
1. An LCP cleaning pulping process comprising the steps of:
s1-normal temperature physicochemical pretreatment stage: cutting the raw materials into short pieces, removing dust and impurities, placing the short pieces into a container, adding a presoaking agent and water into the container, soaking the mixture for 20 to 30 hours at room temperature, removing impurities, and draining the mixture for later use;
s2-low-temperature quick cooking section: adding a cooking medicament into the material obtained in the step S1, stirring and mixing uniformly, and then putting into a reactor for cooking;
s3, a fluffing treatment section: and (3) immediately putting the material obtained in the step (S2) into a pot, cooling, extracting black liquor, washing, and then, entering high-speed defibering equipment for medium-high concentration mechanical treatment to disperse and dissociate material fibers into slurry.
2. The method according to claim 1, wherein, in step S1, the raw material is a bast-type fiber or vein-type fiber raw material;
preferably, the raw material is selected from one or more of hemp seed coat, flax seed coat, jute seed coat, ramie seed coat, abaca seed coat, kenaf seed coat, abaca seed coat, sandalwood seed coat, mulberry bark, cotton seed coat, palm petiole, oil palm empty fruit cluster thread, sisal, pineapple leaf and caralluma bark;
further preferably, the bast-type fibers are selected from sandalwood bark, paper mulberry bark and mulberry bark; the vein fiber is selected from sisal, pineapple leaf and palm petiole.
3. The method according to claim 1 or 2, wherein in step S1 the chopping is chopping the feedstock to a length of 15cm or less, more preferably to a length of 3-5 cm;
preferably, in step S1, the total amount of said pre-preg used is from 1 to 5%, more preferably from 3 to 4%, with respect to the oven-dried mass of the raw material;
preferably, in step S1, the water is used in an amount based on the immersion raw material;
preferably, the impurities are removed such as dissolved matters, cuticle matters, sand and stones.
4. Method according to any one of claims 1 to 3, wherein, in step S1, when the raw material is bast-type fibres, the pre-impregnant is chosen from NaOH, na 2 SO 3 And Ca (OH) 2 Two or more of (a); preferably, the pre-impregnant is composed of NaOH and Na 2 SO 3 Consisting of, or consisting of NaOH and Ca (OH) 2 Composition is carried out; further preferably, the pre-infusion is composed of 2-3% NaOH and 1-2% Na 2 SO 3 Composed of or consisting of 2-3% NaOH and 1-2% Ca (OH) 2 Composition is carried out; wherein the percentage is the percentage relative to the oven dry mass of the raw materials;
preferably, in step S1, when the raw material is vein fiber, the pre-infusion is selected from NaOH and Na 2 SO 3 、Ca(OH) 2 And Na 3 PO 4 More preferably, the pre-preg consists of Ca (OH) 2 And Na 2 SO 3 Consisting of, or consisting of NaOH and Ca (OH) 2 Is composed of NaOH and Ca (OH) 2 And Na 3 PO 4 Composition is carried out; further preferably, the pre-infusion is composed of 1-2% Ca (OH) 2 And 1-2% of Na 2 SO 3 Consisting of, or consisting of 1-3% NaOH and 1-2% Ca (OH) 2 Consisting of, or consisting of 1-3% NaOH, 1-2% Ca (OH) 2 And 1-2% of Na 3 PO 4 Composition is carried out; wherein the percentages are percentages relative to the oven dried mass of the feedstock.
5. Method according to any one of claims 1 to 4, wherein, in step S2, the cooking agent comprises a chemical selected from NaOH, na 3 PO 4 、AQ(C 14 H 8 O 2 )、H 2 O 2 DTPA, lbO, KOH and Ca (OH) 2 One or more of;
preferably, in step S2, the cooking chemical comprises one or more selected from 1% to 12% NaOH, 1% to 8% Na 3 PO 4 、0～0.06％AQ(C 14 H 8 O 2 )、0～4％H 2 O 2 0-2% DTPA, 0-0.2% green oxygen, 1-12% KOH and 1-12% Ca (OH) 2 One or more of (a); more preferably, the cooking chemical comprises NaOH, 1-3% Na selected from 8-10% 3 PO 4 、0～0.05％AQ(C 14 H 8 O 2 )、0～2％H 2 O 2 0-1% DTPA, 0-0.08% green oxygen, 1-2% KOH and 1-2% Ca (OH) 2 One or more of (a); wherein the percentage is relative to the oven dry mass of the raw materials;
preferably, in step S2, when the raw material is bast-type fiber, the cooking agent comprises NaOH or Na 3 PO 4 、AQ(C 14 H 8 O 2 )、H 2 O 2 One or more of DTPA and green oxygen; more preferably, the cooking chemical comprises NaOH in an amount selected from the group consisting of 1% to 12%, na in an amount selected from the group consisting of 1% to 8% 3 PO 4 、0～0.06％AQ(C 14 H 8 O 2 )、0～4％H 2 O 2 0-2% of DTPA and 0-0.2% of green oxygen; more preferably, the cooking agent comprises NaOH, na, in an amount selected from the group consisting of 8% to 10%, 1% to 3% 3 PO 4 、0～0.05％AQ(C 14 H 8 O 2 )、0～2％H 2 O 2 0 to 1% of DTPA and 0 to 0.08% of green oxygen;
preferably, in step S2, when the raw material is bast fiber, the cooking agent is selected from NaOH and Na 3 PO 4 And AQ; more preferably, from 8% to 10% of NaOH, from 1% to 3% of Na 3 PO 4 And 0 to 0.05% aq; even more preferably from 10% NaOH, 3% Na 3 PO 4 And 0.05% aq composition;
preferably, in step S2, when the raw material is bast fiber, the cooking agent is selected from NaOH and H 2 O 2 And DTPA; more preferably 8% to 10% NaOH, 0 to 2% 2 O 2 And 0-1% DTPA; even more preferably by 10% NaOH, 2% H 2 O 2 And 1% of DTPA composition;
preferably, in step S2, when the raw material is bast-type fiber, the cooking chemical is composed of NaOH and green oxygen; further preferably 8-10% NaOH and 0-0.08% green oxygen; even more preferably 8% NaOH and 0.08% Green oxygen.
6. The method according to any one of claims 1 to 5, wherein, in step S2, when the raw material is a vein-like fiber, the cooking agent comprises a chemical selected from NaOH, KOH, AQ, ca (OH) 2 And Na 3 PO 4 One or more of (a); further preferably comprises a content selected from 1% to 12% NaOH, 1% to 12% KOH,0 to 0.06% AQ, 1% to 12% Ca (OH) 2 And 1% to 8% of Na 3 PO 4 One or more of; go further forwardOne step preferably comprises a percentage selected from 8% to 10% NaOH, 1% to 2% KOH,0 to 0.05% AQ, 1% to 2% Ca (OH) 2 And 1% to 3% of Na 3 PO 4 One or more of;
preferably, in step S2, when the raw material is vein-like fiber, the cooking chemical consists of NaOH, KOH and AQ; more preferably 8% to 10% NaOH, 1% to 2% KOH and 0% to 0.05% AQ; even more preferably by 8% NaOH, 2% KOH and 0.05% AQ;
preferably, in step S2, when the raw material is vein fiber, the cooking agent is NaOH, ca (OH) 2 And AQ; more preferably, the content of NaOH, 1% to 2% by weight, ca (OH) 2 And 0 to 0.05% by weight of AQ; even more preferably 8% NaOH, 2% Ca (OH) 2 And 0.05% aq composition;
preferably, in step S2, when the raw material is vein fiber, the cooking agent is NaOH or Na 3 PO 4 And AQ; more preferably 8% to 10% NaOH, 1% to 3% Na 3 PO 4 And 0 to 0.05% by weight of AQ; even more preferably by 10% NaOH, 3% Na 3 PO 4 And 0.05% AQ composition.
7. The method according to any one of claims 1 to 6, wherein in step S2, it further comprises the operation of adding water according to a ratio of 1:3 to 1:8, more preferably according to a ratio of 1:4 to 1:4.5 liquid ratio; wherein the liquid ratio refers to the ratio of the absolute dry amount of the raw materials to the added water amount.
8. The process according to any one of claims 1 to 7, wherein, in step S2, the cooking further comprises a cooking stage I and a cooking stage II; preferably, the cooking stage I is to heat the mixture from a normal temperature to a middle temperature within 60min, preferably 40-50 min, and then keep the temperature for 30-60 min, wherein the middle temperature is not more than 135 ℃, and more preferably 110-125 ℃;
preferably, the cooking stage II is carried out within 30min, preferably within 20-30 min, by raising the temperature from the medium temperature to a maximum temperature, which is not more than 160 ℃, more preferably 150-155 ℃, and then holding for 60-90 min.
9. Virgin pulp obtained from the LCP cleaning pulping process of any one of claims 1 to 8.
10. Use of virgin pulp obtained from the LCP clean pulping process of any one of claims 1 to 8 in pulping papermaking engineering.
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