CN111364272A - Treatment process for improving pulping performance of wheat straws - Google Patents
Treatment process for improving pulping performance of wheat straws Download PDFInfo
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- CN111364272A CN111364272A CN202010257753.6A CN202010257753A CN111364272A CN 111364272 A CN111364272 A CN 111364272A CN 202010257753 A CN202010257753 A CN 202010257753A CN 111364272 A CN111364272 A CN 111364272A
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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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
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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
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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
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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
- D21C3/26—Multistage 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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Abstract
The invention discloses a treatment process for improving the pulping performance of wheat straws; the method comprises the following steps of preparing wheat straws into chopped straws, carrying out primary cooking treatment on the chopped straws, and drying to obtain pretreated straws; adding the pretreated straws into a low-concentration organic acid solution for treatment reaction to obtain acidic straws; adding the acidic straws into a bulking machine for bulking treatment to obtain bulked straws; performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry; adding the secondary cooking pulp into a pulp grinder for grinding, and screening and filter-pressing to obtain paper pulp; the pulp slurry prepared by the method has higher viscosity, the degree of mutual permeation between straw fiber tissues and liquid components in the pulp prepared by the method is higher, the separation between lignin and carbohydrates is promoted, lignin and other cell tissues are more degraded, and the separation degree of cellulose, hemicellulose and lignin is obviously improved.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a treatment process for improving the pulping performance of wheat straws.
Background
China is a big agricultural country, wheat is also a main crop, and the total amount of straw resources reaches hundreds of millions of tons every year. Before the middle of the 20 th century, wheat straws were mainly used as a domestic fuel, a fertilizer and a feed. However, with the popularization of coal and petroleum liquefied gas fuel and the increase of the usage amount of chemical fertilizers, a large amount of wheat straws in rural areas are accumulated. At present, the utilization rate of rural straws is less than 2%, the rest straws are discarded or burned on the spot, and a lot of dense smoke cages cover the straws, even cause road traffic accidents or influence the take-off of airplanes. Not only wastes valuable resources, but also causes environmental pollution. Therefore, the disposal and effective utilization of wheat straw have become a problem to be solved urgently and a hotspot for research of experts and scholars.
The paper making industry in China is in a high-speed growth period, the total output of paper and paper boards is always greatly lower than the total consumption, the annual average paper consumption is far lower than the level of developed countries in the world, and the demand for paper is increased by more than 12% per year on average. China is the biggest world paper consumer country and producer country, but forest resources are scarce, wood pulp papermaking raw materials are deficient, and 65% of production raw materials need imported wood pulp and waste paper to make up the gaps of the raw materials. Recently, the price of paper pulp in the international market has generally risen, increasing the cost of paper making.
Therefore, how to prepare the papermaking paper pulp by using the wheat straws can not only improve the resource utilization rate and avoid the abandonment of a large amount of wheat straw resources, but also relieve the shortage of papermaking resources.
The invention discloses packaging paper, application number 201510908007.8, relating to packaging paper, in particular to mildew-proof antibacterial food packaging paper, which comprises the following substances in parts by weight: 50-60 parts of masson pine, 45-55 parts of wheat straw, 25-30 parts of konjac glucomannan, 45-50 parts of garlic skin, 10-15 parts of sodium hydroxide, 5-10 parts of soybean protein liquid, 10-15 parts of prebiotics, 1-3 parts of chlorhexidine gluconate, 3-8 parts of sorbic acid, 10-15 parts of hydrophilic film forming agent and 0.5-0.8 part of mildew preventive. The mildew-proof antibacterial food packaging paper provided by the invention is low in cost and easy to prepare, and can effectively play a role in mildew prevention and antibiosis by adopting a purely natural antibacterial agent and a mildew preventive, and the packaging paper provided by the invention is biodegradable and has an important environmental protection significance.
Disclosure of Invention
The invention aims to provide a treatment process for improving the pulping performance of wheat straws, so as to solve the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a treatment process for improving pulping performance of wheat straws comprises the steps of preparing the wheat straws into broken straws, carrying out primary cooking treatment on the broken straws, and drying to obtain pretreated straws;
adding the pretreated straws into a low-concentration organic acid solution for a treatment reaction for 30-40min to obtain acidic straws;
preferably, when the treatment reaction is carried out for 20min, ultrasonic treatment is carried out, the ultrasonic power is not higher than 500W, and the frequency is not lower than 35 kHz;
adding the acidic straws into a bulking machine for bulking treatment to obtain bulked straws;
performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry;
and adding the secondary cooking pulp into a pulping machine for pulping, and screening and filter-pressing to obtain paper pulp.
The chopped straw is obtained by chopping wheat straw into 1 cm.
The primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6-8, and heating for 55-58min in a closed manner at the temperature of 96-98 ℃.
The low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride;
wherein, the mass fraction of the p-toluenesulfinic acid is 0.15 to 0.2 percent, and the mass fraction of the maleic anhydride is 0.3 to 0.4 percent;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1: 2.
The mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 500-550mL, and the reaction temperature is 60-66 ℃.
The puffing treatment parameters are as follows: the expansion pressure is 0.8-1.2MPa, the processing temperature in the expander is 100-140 ℃, and the expansion processing time is 55-70 s.
The bulking machine is a double-screw bulking machine.
The secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding 9-10% of sodium hydroxide by mass, heating to 95-98 ℃ in a closed container, preserving heat for 30-35min, and naturally cooling to room temperature to obtain the puffed straw;
the ethanol solution is 0.5-0.7% by mass;
the mass ratio of the ethanol solution to the puffed straw is 1: 5.
The refining process was 2000 revolutions in a refiner.
The puffing treatment parameters are as follows: the expansion pressure is 0.8-1.2MPa, the processing temperature in the expander is 100-140 ℃, and the expansion processing time is 55-70 s. During the expansion treatment, the rotating speed of a motor of the expansion machine is 550r/min, the temperature of the front section of an expansion cavity of the expansion machine is 112-.
Has the advantages that: the invention provides a treatment process for improving pulping performance of wheat straws, which adopts low-concentration organic acid solution to carry out treatment reaction on pretreated straws, can loosen the fiber tissue structure of the straws to a certain extent, simultaneously can carry out grafting reaction on groups on the fiber tissue by toluene sulfinic acid and maleic anhydride, particularly, can react on the groups on cellulose, hemicellulose and lignin to promote the separation degree among the three elements to be increased, so that the cellulose, the hemicellulose and the lignin can be uniformly dispersed, the phenomena that the adhesion degree among the cellulose, the hemicellulose and the lignin in the paper pulp in the traditional wheat straws is higher, the three elements in the paper pulp are not uniformly dispersed and the paper making quality is poorer are avoided, the performance of the paper pulp is improved, the content of mixed cells is reduced in the subsequent pulping treatment, and the mixed cells are promoted to be in a fiber shape, the fiber pulp can be more uniformly dispersed among main fibers, the performance of the paper pulp is improved, the generation of a wall breaking effect can be promoted by carrying out ultrasonic treatment, fiber cells are promoted to generate cracks, cell walls can displace and deform to a certain degree, the separation degree among cellulose, hemicellulose and lignin is accelerated, the dispersion degree is increased, meanwhile, the fiber refining and the devillicate brooming effects are realized, the fiber swelling effect is enhanced, hydrogen bonds among fiber molecular chains are broken, the internal surface area of fibers is increased, the accessibility of fiber cell tissues to toluene sulfinic acid and maleic anhydride and the chemical reaction activity are greatly increased, the viscosity of the paper pulp slurry prepared by the method is higher, the degree of mutual permeation between straw fiber tissues and liquid components in the paper pulp prepared by the method is higher, and the separation between lignin and carbohydrate is promoted, lignin and other cell tissues are degraded more, the separation degree of cellulose, hemicellulose and lignin is obviously improved, and further, the viscosity of the paper pulp is improved.
Drawings
FIG. 1 is a graph of fluff pulp yield versus ultrasonic frequency for pulp slurry.
Detailed Description
A treatment process for improving pulping performance of wheat straws comprises the steps of preparing the wheat straws into broken straws, carrying out primary cooking treatment on the broken straws, and drying to obtain pretreated straws;
adding the pretreated straws into a low-concentration organic acid solution for a treatment reaction for 30-40min to obtain acidic straws;
preferably, when the treatment reaction is carried out for 20min, ultrasonic treatment is carried out, the ultrasonic power is not higher than 500W, the frequency is not lower than 35kHz, and preferably 38kHz, the invention adopts low-concentration organic acid solution to carry out treatment reaction on the pretreated straws, can loosen the fiber tissue structure of the straws to a certain extent, simultaneously can carry out grafting reaction on groups on the fiber tissue by toluene sulfinic acid and maleic anhydride, and particularly, can react on groups on cellulose, hemicellulose and lignin to promote the separation degree among the three elements to be increased, so that the cellulose, the hemicellulose and the lignin can be uniformly dispersed, the phenomena of higher adhesion degree among the cellulose, the hemicellulose and the lignin in the paper pulp in the traditional wheat straws, uneven dispersion of the three elements in the paper pulp and poorer paper quality are avoided, and the performance of the paper pulp is improved, the content of the impure cells is reduced in the subsequent pulping treatment, the impure cells are promoted to be transformed into filamentous cells and can be uniformly dispersed among main fibers, the performance of paper pulp is improved, the wall breaking effect can be promoted to be generated by ultrasonic treatment, the fibrocytes are promoted to be cracked, the cell walls can be displaced and deformed to a certain degree, the separation degree among cellulose, hemicellulose and lignin is accelerated, the dispersion degree is increased, meanwhile, the effects of fibrillation and fibrillation are achieved, the swelling effect of the fibers is enhanced, hydrogen bonds among fiber molecular chains are broken, the inner surface area of the fibers is increased, and the accessibility and chemical reaction activity of fiber cell tissues to toluene sulfinic acid and maleic anhydride are greatly increased;
adding the acidic straws into a bulking machine for bulking treatment to obtain bulked straws;
performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry;
and adding the secondary cooking pulp into a pulping machine for pulping, and screening and filter-pressing to obtain paper pulp.
The chopped straw is obtained by chopping wheat straw into 1 cm.
The primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6-8, and heating for 55-58min in a closed manner at the temperature of 96-98 ℃.
The low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride;
wherein, the mass fraction of the p-toluenesulfinic acid is 0.15 to 0.2 percent, and the mass fraction of the maleic anhydride is 0.3 to 0.4 percent;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1: 2.
The mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 500-550mL, and the reaction temperature is 60-66 ℃.
The puffing treatment parameters are as follows: the expansion pressure is 0.8-1.2MPa, the processing temperature in the expander is 100-140 ℃, and the expansion processing time is 55-70 s.
The bulking machine is a double-screw bulking machine.
The secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding 9-10% of sodium hydroxide by mass, heating to 95-98 ℃ in a closed container, preserving heat for 30-35min, and naturally cooling to room temperature to obtain the puffed straw;
the ethanol solution is 0.5-0.7% by mass;
the mass ratio of the ethanol solution to the puffed straw is 1: 5.
The refining process was 2000 revolutions in a refiner, wherein the refining was a PFI mill.
The puffing treatment parameters are as follows: the expansion pressure is 0.8-1.2MPa, the processing temperature in the expander is 100-140 ℃, and the expansion processing time is 55-70 s. During the expansion treatment, the rotating speed of a motor of the expansion machine is 550r/min, the temperature of the front section of an expansion cavity of the expansion machine is 112-.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The method comprises the following steps of preparing wheat straws into chopped straws, wherein the chopped straws are obtained by chopping the wheat straws into 1cm, and carrying out primary cooking treatment on the chopped straws, wherein the primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6, heating for 55min in a closed manner at the temperature of 96 ℃, and drying to obtain pretreated straws; adding the pretreated straws into a low-concentration organic acid solution for treatment reaction, wherein the low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride, the mass fraction of the p-toluenesulfinic acid is 0.15%, and the mass fraction of the maleic anhydride is 0.3%;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1:2, and the mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 500mL, the reaction temperature is 60 ℃, and the reaction time is 30min, so as to obtain acid straws; adding the acidic straw into a double-screw bulking machine for bulking treatment to obtain bulked straw, wherein the bulking treatment parameters are as follows: the parameters of the puffing treatment are as follows: the puffing pressure is 0.8MPa, the processing temperature in the puffing machine is 100 ℃, and the puffing processing time is 55 s. During the puffing treatment, the rotating speed of a motor of the puffing machine is 550r/min, the temperature of the front section of a puffing cavity of the puffing machine is 112 ℃, the temperature of the middle section of the puffing cavity is 118 ℃, the temperature of the rear section of the puffing cavity is 126 ℃, and the discharging speed of the puffing machine is 50 kg/min; performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry, wherein the secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding sodium hydroxide with the mass fraction of 9%, heating to 95 ℃ in a closed container, preserving heat for 30min, and naturally cooling to room temperature to obtain the puffed straw; the ethanol solution is 0.5% by mass; the mass ratio of the ethanol solution to the puffed straw is 1: 5; and adding the secondary cooking pulp into a pulping machine for pulping, wherein the pulping process is that the pulp is beaten for 2000 revolutions in the pulping machine, and the pulp is obtained through screening and filter pressing.
Example 2
The method comprises the following steps of preparing wheat straws into chopped straws, wherein the chopped straws are obtained by chopping the wheat straws into 1cm, and carrying out primary cooking treatment on the chopped straws, wherein the primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:8, heating for 58min in a closed manner at the temperature of 98 ℃, and drying to obtain pretreated straws; adding the pretreated straws into a low-concentration organic acid solution for treatment reaction, wherein the low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride, the mass fraction of the p-toluenesulfinic acid is 0.2%, and the mass fraction of the maleic anhydride is 0.4%;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1:2, and the mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 550mL, the reaction temperature is 66 ℃, and the reaction time is 40min, so as to obtain acidic straws; adding the acidic straw into a double-screw bulking machine for bulking treatment to obtain bulked straw, wherein the bulking treatment parameters are as follows: the parameters of the puffing treatment are as follows: the puffing pressure is 1.2MPa, the processing temperature in the puffing machine is 140 ℃, and the puffing processing time is 70 s. During the puffing treatment, the rotating speed of a motor of the puffing machine is 550r/min, the temperature of the front section of a puffing cavity of the puffing machine is 116 ℃, the temperature of the middle section of the puffing cavity is 124 ℃, the temperature of the rear section of the puffing cavity is 129 ℃, and the discharging speed of the puffing machine is 55 kg/min; performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry, wherein the secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding sodium hydroxide, wherein the mass fraction of the sodium hydroxide is 10%, heating to 98 ℃ in a closed container, preserving heat for 35min, and naturally cooling to room temperature to obtain the puffed straw; the ethanol solution is 0.7% by mass; the mass ratio of the ethanol solution to the puffed straw is 1: 5; adding the secondary cooking pulp into a pulping machine for pulping, wherein the pulping process is that the pulp is beaten for 2000 revolutions in the pulping machine, and the pulp is obtained through screening and filter pressing;
example 3
The method comprises the following steps of preparing wheat straws into chopped straws, wherein the chopped straws are obtained by chopping the wheat straws into 1cm, and carrying out primary cooking treatment on the chopped straws, wherein the primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6.7, heating for 56min in a closed manner at the temperature of 97 ℃, and drying to obtain pretreated straws; adding the pretreated straws into a low-concentration organic acid solution for treatment reaction, wherein the low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride, the mass fraction of the p-toluenesulfinic acid is 0.18%, and the mass fraction of the maleic anhydride is 0.32%;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1:2, and the mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 530mL of the solution is obtained, the reaction temperature is 62 ℃, and the reaction time is 35min, so that the acidic straw is obtained; adding the acidic straw into a double-screw bulking machine for bulking treatment to obtain bulked straw, wherein the bulking treatment parameters are as follows: the parameters of the puffing treatment are as follows: the puffing pressure is 1.1MPa, the processing temperature in the puffing machine is 120 ℃, and the puffing processing time is 59 s. During the puffing treatment, the rotating speed of a motor of the puffing machine is 550r/min, the temperature of the front section of a puffing cavity of the puffing machine is 113 ℃, the temperature of the middle section is 121 ℃, the temperature of the rear section is 127 ℃, and the discharging speed of the puffing machine is 52 kg/min; performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry, wherein the secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding sodium hydroxide with the mass fraction of 9.6%, heating to 96 ℃ in a closed container, preserving heat for 34min, and naturally cooling to room temperature to obtain the puffed straw; the ethanol solution is 0.58% by mass; the mass ratio of the ethanol solution to the puffed straw is 1: 5; and adding the secondary cooking pulp into a pulping machine for pulping, wherein the pulping process is that the pulp is beaten for 2000 revolutions in the pulping machine, and the pulp is obtained through screening and filter pressing.
The content of nitric acid-ethanol cellulose in the pulp of example 3 and the control group was measured:
TABLE 1
| Cellulose content of nitric acid-ethanol% | |
| Example 3 | 41.25 |
| Control group | 31.86 |
Control group: directly adding alkali to the wheat straws for cooking, wherein the cooking temperature is 96 ℃, and the material-liquid ratio is 5: 1, the cooking time is 34min, and the mass fraction of sodium hydroxide is 9.6%;
as can be seen from Table 1, the treatment of wheat straw in the method of the present invention can significantly improve the content of nitric acid-ethanol cellulose in the prepared paper pulp and improve the performance of the paper pulp.
Example 4
The method comprises the following steps of preparing wheat straws into chopped straws, wherein the chopped straws are obtained by chopping the wheat straws into 1cm, and carrying out primary cooking treatment on the chopped straws, wherein the primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6.7, heating for 56min in a closed manner at the temperature of 97 ℃, and drying to obtain pretreated straws; adding the pretreated straws into a low-concentration organic acid solution for treatment reaction, wherein the low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride, the mass fraction of the p-toluenesulfinic acid is 0.18%, and the mass fraction of the maleic anhydride is 0.32%;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1:2, and the mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 530mL, the reaction temperature is 62 ℃, the reaction time is 35min, when the treatment reaction is carried out for 20min, ultrasonic treatment is carried out, the ultrasonic power is 500W, the frequency is 38kHz, and acidic straws are obtained; adding the acidic straw into a double-screw bulking machine for bulking treatment to obtain bulked straw, wherein the bulking treatment parameters are as follows: the parameters of the puffing treatment are as follows: the puffing pressure is 1.1MPa, the processing temperature in the puffing machine is 120 ℃, and the puffing processing time is 59 s. During the puffing treatment, the rotating speed of a motor of the puffing machine is 550r/min, the temperature of the front section of a puffing cavity of the puffing machine is 113 ℃, the temperature of the middle section is 121 ℃, the temperature of the rear section is 127 ℃, and the discharging speed of the puffing machine is 52 kg/min; performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry, wherein the secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding sodium hydroxide with the mass fraction of 9.6%, heating to 96 ℃ in a closed container, preserving heat for 34min, and naturally cooling to room temperature to obtain the puffed straw; the ethanol solution is 0.58% by mass; the mass ratio of the ethanol solution to the puffed straw is 1: 5; adding the secondary cooking pulp into a pulping machine for pulping, wherein the pulping process is that the pulp is beaten for 2000 revolutions in the pulping machine, and the pulp is obtained through screening and filter pressing;
the lignin in the pulp is measured in example 3 and example 4, GB/T2677.8-1994:
TABLE 2
| Lignin% | |
| Example 3 | 10.39 |
| Example 4 | 9.05 |
| Control group | 14.27 |
Control group: directly adding alkali to the wheat straws for cooking, wherein the cooking temperature is 96 ℃, and the material-liquid ratio is 5: 1, the cooking time is 34min, and the mass fraction of sodium hydroxide is 9.6%;
as can be seen from table 2, the lignin content in the pulps prepared in examples 3 and 4 is greatly reduced, the lignin content in the pulps is reduced, and not only can the use content of chemical products be effectively reduced, the cost is reduced, but also the tear resistance of the pulps is improved.
Example 5
The method comprises the following steps of preparing wheat straws into chopped straws, wherein the chopped straws are obtained by chopping the wheat straws into 1cm, and carrying out primary cooking treatment on the chopped straws, wherein the primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6.7, heating for 56min in a closed manner at the temperature of 97 ℃, and drying to obtain pretreated straws; adding the pretreated straws into a low-concentration organic acid solution for treatment reaction, wherein the low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride, the mass fraction of the p-toluenesulfinic acid is 0.18%, and the mass fraction of the maleic anhydride is 0.32%;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1:2, and the mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 530mL, the reaction temperature is 62 ℃, the reaction time is 35min, when the treatment reaction is carried out for 20min, ultrasonic treatment is carried out, the ultrasonic power is 400W, the frequency is 35kHz, and acidic straws are obtained; adding the acidic straw into a double-screw bulking machine for bulking treatment to obtain bulked straw, wherein the bulking treatment parameters are as follows: the parameters of the puffing treatment are as follows: the puffing pressure is 1.1MPa, the processing temperature in the puffing machine is 120 ℃, and the puffing processing time is 59 s. During the puffing treatment, the rotating speed of a motor of the puffing machine is 550r/min, the temperature of the front section of a puffing cavity of the puffing machine is 113 ℃, the temperature of the middle section is 121 ℃, the temperature of the rear section is 127 ℃, and the discharging speed of the puffing machine is 52 kg/min; performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry, wherein the secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding sodium hydroxide with the mass fraction of 9.6%, heating to 96 ℃ in a closed container, preserving heat for 34min, and naturally cooling to room temperature to obtain the puffed straw; the ethanol solution is 0.58% by mass; the mass ratio of the ethanol solution to the puffed straw is 1: 5; adding the secondary cooking pulp into a pulping machine for pulping, wherein the pulping process is that the pulp is beaten for 2000 revolutions in the pulping machine, and the pulp is obtained through screening and filter pressing;
example 6
The method comprises the following steps of preparing wheat straws into chopped straws, wherein the chopped straws are obtained by chopping the wheat straws into 1cm, and carrying out primary cooking treatment on the chopped straws, wherein the primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6.7, heating for 56min in a closed manner at the temperature of 97 ℃, and drying to obtain pretreated straws; adding the pretreated straws into a low-concentration organic acid solution for treatment reaction, wherein the low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride, the mass fraction of the p-toluenesulfinic acid is 0.18%, and the mass fraction of the maleic anhydride is 0.32%;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1:2, and the mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 530mL, the reaction temperature is 62 ℃, the reaction time is 35min, when the treatment reaction is carried out for 20min, ultrasonic treatment is carried out, the ultrasonic power is 350W, the frequency is 40kHz, and acidic straws are obtained; adding the acidic straw into a double-screw bulking machine for bulking treatment to obtain bulked straw, wherein the bulking treatment parameters are as follows: the parameters of the puffing treatment are as follows: the puffing pressure is 1.1MPa, the processing temperature in the puffing machine is 120 ℃, and the puffing processing time is 59 s. During the puffing treatment, the rotating speed of a motor of the puffing machine is 550r/min, the temperature of the front section of a puffing cavity of the puffing machine is 113 ℃, the temperature of the middle section is 121 ℃, the temperature of the rear section is 127 ℃, and the discharging speed of the puffing machine is 52 kg/min; performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry, wherein the secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding sodium hydroxide with the mass fraction of 9.6%, heating to 96 ℃ in a closed container, preserving heat for 34min, and naturally cooling to room temperature to obtain the puffed straw; the ethanol solution is 0.58% by mass; the mass ratio of the ethanol solution to the puffed straw is 1: 5; and adding the secondary cooking pulp into a pulping machine for pulping, wherein the pulping process is that the pulp is beaten for 2000 revolutions in the pulping machine, and the pulp is obtained through screening and filter pressing.
Test of
The equivalent pulp viscosity performance of examples 1-6 was tested and compared;
TABLE 3
| Viscosity mL/g | |
| Example 1 | 886.3 |
| Example 2 | 875.9 |
| Example 3 | 898.7 |
| Example 4 | 915.5 |
| Example 5 | 907.2 |
| Example 6 | 912.3 |
| Control group | 635.6 |
Control group: directly adding alkali to the wheat straws for cooking, wherein the cooking temperature is 96 ℃, and the material-liquid ratio is 5: 1, the cooking time is 34min, and the mass fraction of sodium hydroxide is 9.6%;
it can be seen from table 3 that the pulp slurry prepared by the present invention has higher viscosity, because the degree of the mutual permeation between the straw fiber tissue and the liquid component in the pulp prepared by the method of the present invention is higher, the separation between lignin and carbohydrate is promoted, lignin and other cell tissues are more degraded, and the viscosity of the pulp is improved.
FIG. 1 is a graph showing the fine pulp yield of pulp slurry and ultrasonic frequency, and using example 4 as a basic test sample, the effect of different ultrasonic frequencies on the fine pulp yield of pulp slurry is compared, and it can be seen from FIG. 1 that the fine pulp yield of pulp slurry gradually increases with the increase of the ultrasonic frequency, when the ultrasonic frequency reaches 38kHz, the fine pulp reaches an optimum value, and after the ultrasonic frequency exceeds 38kHz, the fine pulp yield in pulp slurry decreases slightly.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (9)
1. A treatment process for improving pulping performance of wheat straws is characterized by comprising the following steps: preparing wheat straws into chopped straws, performing primary cooking treatment on the chopped straws, and drying to obtain pretreated straws;
adding the pretreated straws into a low-concentration organic acid solution for treatment reaction to obtain acidic straws;
adding the acidic straws into a bulking machine for bulking treatment to obtain bulked straws;
performing secondary cooking treatment on the puffed straw to obtain secondary cooking slurry;
and adding the secondary cooking pulp into a pulping machine for pulping, and screening and filter-pressing to obtain paper pulp.
2. The treatment process for improving the pulping performance of the wheat straws according to claim 1, which is characterized in that: the chopped straw is obtained by chopping wheat straw into 1 cm.
3. The treatment process for improving the pulping performance of the wheat straws according to claim 1, which is characterized in that: the primary cooking treatment comprises the following steps: adding the crushed straws into water, wherein the mass ratio of the crushed straws to the water is 1:6-8, and heating for 55-58min in a closed manner at the temperature of 96-98 ℃.
4. The treatment process for improving the pulping performance of the wheat straws according to claim 1, which is characterized in that: the low-concentration organic acid solution is a mixed solution of p-toluenesulfinic acid and maleic anhydride;
wherein, the mass fraction of the p-toluenesulfinic acid is 0.15 to 0.2 percent, and the mass fraction of the maleic anhydride is 0.3 to 0.4 percent;
the mass ratio of the p-toluenesulfinic acid to the maleic anhydride is 1: 2.
5. The treatment process for improving the pulping performance of the wheat straws according to the claim 1 or 4, which is characterized in that: the mixing ratio of the pretreated straws to the low-concentration organic acid solution is 120 g: 500-550mL, and the reaction temperature is 60-66 ℃.
6. The treatment process for improving the pulping performance of the wheat straws according to claim 1, which is characterized in that: the puffing treatment parameters are as follows: the expansion pressure is 0.8-1.2MPa, the processing temperature in the expander is 100-140 ℃, and the expansion processing time is 55-70 s.
7. The treatment process for improving the pulping performance of the wheat straws according to claim 1 or 6, which is characterized in that: the bulking machine is a double-screw bulking machine.
8. The treatment process for improving the pulping performance of the wheat straws according to claim 1, which is characterized in that: the secondary cooking treatment comprises the following steps: adding the puffed straw into an ethanol solution, adding 9-10% of sodium hydroxide by mass, heating to 95-98 ℃ in a closed container, preserving heat for 30-35min, and naturally cooling to room temperature to obtain the puffed straw;
the ethanol solution is 0.5-0.7% by mass;
the mass ratio of the ethanol solution to the puffed straw is 1: 5.
9. The treatment process for improving the pulping performance of the wheat straws according to claim 1, which is characterized in that: the refining process was 2000 revolutions in a refiner.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969512A (en) * | 2021-11-19 | 2022-01-25 | 中国科学院宁波材料技术与工程研究所 | All-straw paper-making pulp and preparation method and application thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113969512A (en) * | 2021-11-19 | 2022-01-25 | 中国科学院宁波材料技术与工程研究所 | All-straw paper-making pulp and preparation method and application thereof |
| CN113969512B (en) * | 2021-11-19 | 2024-01-26 | 中国科学院宁波材料技术与工程研究所 | Full straw papermaking pulp and preparation method and application thereof |
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