阅读说明：本技术 一种基于芦苇制备本色生物机械浆及副产物全利用的方法 (Method for preparing natural-color biomechanical pulp based on reeds and fully utilizing byproducts ) 是由 吉兴香 田中建 王瑞明 赵双双 于 2021-07-15 设计创作，主要内容包括：本发明涉及一种基于芦苇制备本色生物机械浆及副产物全利用的方法,属于造纸技术与新材料技术领域。本发明以芦苇为原料,在生物机械浆制备过程中,在生物机械浆制备过程中,通过合理优化制备过程和步骤,通过热水、水蒸气、微量KOH和生物酶等的组合使用,使得待磨浆完成时生物机械浆的pH值接近中性,同时获得的生物机械浆得率较高(75～85％),从而极大提高了芦苇的利用率,与传统的化学机械浆相比较,可节省磨浆能耗40％以上,且经试验验证,制备得到的生物机械浆的各项物理指标达到了本色生产包装纸和纸基材料的要求。磨浆洗涤水进一步造粒做成生物质复合肥,整个生产过程绿色环保,实现芦苇的综合高值化全利用。(The invention relates to a method for preparing natural-color biomechanical pulp based on reeds and fully utilizing byproducts, belonging to the technical field of papermaking technology and new materials. According to the invention, the reed is used as a raw material, in the preparation process of the bio-mechanical pulp, the pH value of the bio-mechanical pulp is close to neutral when the pulp is grinded and is finished by reasonably optimizing the preparation process and steps and using the combination of hot water, water vapor, trace KOH, bio-enzyme and the like in the preparation process of the bio-mechanical pulp, and simultaneously, the obtained bio-mechanical pulp has high yield (75-85%), so that the utilization rate of the reed is greatly improved, compared with the traditional chemical mechanical pulp, the pulp grinding energy consumption can be saved by more than 40%, and through experimental verification, various physical indexes of the prepared bio-mechanical pulp meet the requirements of producing the packing paper base material and paper in the natural color. The pulping and washing water is further granulated to prepare the biomass compound fertilizer, the whole production process is green and environment-friendly, and the comprehensive high-valued full utilization of the reeds is realized.)

1. A method for preparing natural-color biomechanical pulp based on reeds and fully utilizing byproducts is characterized by comprising the following steps of:

(1) segmenting the reed, washing with hot water, and dehydrating;

(2) adding alkali into the dehydrated reed to adjust the pH value, and then carrying out hot steam treatment;

(3) performing spiral extrusion or devillication treatment on the reed subjected to hot steam treatment, adjusting the pH value to be neutral, and adding compound biological enzyme for enzymolysis softening treatment to obtain reed coarse pulp;

(4) carrying out pulping treatment on the reed coarse pulp;

(5) washing the pulp after grinding to high concentration to obtain the bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and uniformly mixing to obtain reed natural color bio-mechanical pulp; collecting high-concentration washing wastewater;

(6) evaporating and concentrating the high-concentration washing wastewater to obtain a solid matter, and adjusting acid and granulating the solid matter to prepare the biomass compound fertilizer.

2. The method as set forth in claim 1, wherein in the step (1), the reed is preprocessed before being segmented, and the preprocessing method includes: removing the flower spike and most leaves of the reed, preferably removing 70-80% of the leaves by mass.

3. The method of claim 1, wherein in the step (1), the segmentation specific method is as follows: processing the reed into 3-6cm small sections, adding 50-80 ℃ water for cleaning for 5-10 minutes, and then carrying out subsequent dehydration treatment.

4. The method of claim 1, wherein in step (2), the base is potassium hydroxide, and the pH is 11-12;

the specific method for carrying out the hot steam treatment comprises the following steps: treating with 90-105 deg.C hot steam for 15-20 min.

5. The method according to claim 1, wherein in the step (3), the thread rolling compression ratio is controlled to be 1: 1-4.

6. The method according to claim 1, wherein in the step (3), the complex biological enzyme is any two or three of xylanase, cellulase and lipase, preferably any two of the xylanase, cellulase and lipase;

preferably, the total dosage of the complex enzyme is 20-40U/g, and the compounding ratio (enzyme activity) is 1: 3-3: 1; the treatment temperature is 45-60 ℃, the pH value is 6.0-8.0, and the liquid ratio is controlled to be 1: 3.5-5; the time for complex enzyme treatment is controlled to be 20-80 min.

7. The method of claim 1, wherein in step (4), the refining is performed in one or more stages (e.g., two stages), and the refining process specifically comprises: high-concentration refining is carried out, the rotating speed of a main shaft is 2800-.

8. The method as claimed in claim 1, wherein in the step (6), the high-concentration washing wastewater is treated by an MVR evaporator to be evaporated and concentrated to obtain a solid, the solid is adjusted to be neutral in pH value by phosphoric acid, and then the solid is granulated to prepare the biomass compound fertilizer.

9. Mechanical pulp and/or biomass compound fertilizer prepared by the method of any one of claims 1 to 8.

10. Use of the mechanical pulp of claim 9 for the preparation of unbleached wrapping paper, paper based materials and/or use of biomass compound fertilizers as fertilizers.

Technical Field

The invention belongs to the technical field of papermaking and new materials, and particularly relates to a method for preparing natural-color biomechanical pulp based on reeds and fully utilizing byproducts.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

The paper making industry is an important basic raw material industry closely related to the development of national economy and social career, and the consumption level of paper and paperboard is a mark for measuring the modernization level and the civilization degree of the country. At present, the output and consumption of paper and paperboard in China exceed one hundred million tons, account for over 1/4 worldwide and are the first in the world, but the external dependence of papermaking fiber raw materials is high and accounts for over 45 percent, and more than half of the papermaking fiber raw materials are imported waste paper. The state department in 2017 issues a reform implementation scheme about a system for promoting the import management of the solid wastes by forbidding foreign garbage to enter the country, and clearly stipulates that the import of the solid wastes which can be replaced by domestic resources is stopped gradually before the end of 2019. Thus, the paper industry in China faces a serious challenge: the problem of shortage of raw materials is further aggravated; secondly, the replacement of imported waste paper is not slow; and thirdly, green papermaking becomes a necessary trend. Therefore, the method finds an outlet for replacing imported waste paper as soon as possible, realizes clean production and reduction of solid waste sources, and has great significance for solving the current crisis of fiber raw materials and promoting green sustainable development of the papermaking industry.

In the traditional pulping and papermaking, reed is used as an important papermaking raw material for preparing bleached chemical pulp, but because the reed contains silicon elements, the traditional chemical pulping process is easy to scale, so that the alkali recovery of the reed is difficult and the cost is high, and the preparation of the reed chemical pulp is prohibited in the country about 2000 years. With the serious shortage of papermaking raw materials, the research and development of a clean and efficient pulping process taking reed with rich sources as raw materials has obvious significance in the high-value utilization of byproducts in pulping.

Disclosure of Invention

Aiming at the problems, the invention provides a method for preparing natural-color biomechanical pulp based on bulrush and fully utilizing byproducts. According to the invention, the reed is taken as a raw material, the raw material of the reed is comprehensively treated by means of hot steam, biological enzyme and the like, the high-strength natural-color biomechanical pulp is prepared, the requirements of producing natural-color packing paper and paper base materials are met, the by-products are recycled based on the preparation method to prepare the biomass compound fertilizer, waste liquid and solid waste are not required to be discharged, and green comprehensive full utilization of the reed is realized. The preparation method is simple, green, clean and efficient, and has good practical application value and wide application prospect.

The invention adopts the following technical scheme:

the invention provides a method for preparing natural-color biomechanical pulp based on bulrush and fully utilizing byproducts, which comprises the following steps:

(1) segmenting the preprocessed reed, washing with hot water, and dehydrating;

(2) adding alkali into the dehydrated reed to adjust the pH value, and then carrying out hot steam treatment;

(3) performing spiral extrusion or devillication treatment on the reed subjected to hot steam treatment, adjusting the pH value to be neutral, and adding compound biological enzyme for enzymolysis softening treatment to obtain reed coarse pulp;

(4) carrying out one-stage or multi-stage pulping treatment on the reed brown pulp;

(5) washing the pulp after grinding to high concentration to obtain the bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and uniformly mixing to obtain reed natural color bio-mechanical pulp; collecting high-concentration washing wastewater;

(6) evaporating and concentrating the high-concentration washing wastewater to obtain a solid matter, and adjusting acid and granulating the solid matter to prepare the biomass compound fertilizer.

The fertilizer contains a proper amount of K, P elements and a large amount of straw components which are easy to degrade and have small particles, the whole production process is green and environment-friendly, and the comprehensive high-valued full utilization of the reeds is realized.

In a second aspect of the invention, the mechanical pulp and/or biomass compound fertilizer prepared by the method is provided.

In a third aspect of the invention, the application of the mechanical pulp in preparing natural-color packing paper and paper-based materials and/or the application of biomass compound fertilizer as fertilizer is provided.

The beneficial effects of one or more of the above technical solutions are as follows:

according to the technical scheme, the reed is used as a raw material, in the preparation process of the bio-mechanical pulp, the preparation process and steps are reasonably optimized, the pH value of the bio-mechanical pulp is close to neutral when the pulp grinding is finished by using the combination of hot water, water vapor, trace KOH, biological enzyme and the like, and the yield of the obtained bio-mechanical pulp is high (75-85%), so that the utilization rate of the reed is greatly improved, compared with the traditional chemical mechanical pulp, the pulp grinding energy consumption can be saved by over 40%, and through experimental verification, various physical indexes of the prepared bio-mechanical pulp meet the requirements of producing the packaging paper base material and paper in the natural color.

According to the technical scheme, the pulping washing water is concentrated and recovered by the MVR multi-effect evaporator, 15-25% of solid waste can be effectively collected, the pH value of the pulping washing water is adjusted by using trace phosphoric acid, and then the pulping washing water is granulated to prepare the biomass compound fertilizer, the fertilizer contains a proper amount of K, P element and a large amount of straw components which are easy to degrade and small in particle, the whole production process is green and environment-friendly, and therefore comprehensive high-value full utilization of the reeds is achieved.

In a word, the technical scheme accords with the industrial policies of national resource conservation, economic cycle, energy conservation and emission reduction, can generate good economic and social benefits and ecological benefits, has strong practicability and easy popularization, and therefore has good values of practical application and industrial production.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.

In a typical embodiment of the present invention, a method for preparing a natural color bio-mechanical pulp based on reed and fully utilizing byproducts is provided, which comprises the following steps:

(1) segmenting the reed, washing with hot water, and dehydrating;

(2) adding alkali into the reed dehydrated in the step (1) to adjust the pH value, and then carrying out hot steam treatment;

(3) performing spiral extrusion or devillicate treatment on the reed treated in the step (2), adjusting the pH value to be neutral, and adding compound biological enzyme to perform enzymolysis softening treatment to obtain reed coarse pulp;

(4) carrying out one-stage or multi-stage pulping treatment on the reed brown pulp treated in the step (3);

(5) washing the pulp ground in the step (4) at high concentration to obtain bio-mechanical pulp; defibering the obtained bio-mechanical pulp by a defibering device, and uniformly mixing to obtain reed natural color bio-mechanical pulp; collecting high-concentration washing wastewater;

(6) and (4) evaporating and concentrating the high-concentration washing wastewater collected in the step (5) to obtain a solid matter, and adjusting acid of the solid matter and granulating to prepare the biomass compound fertilizer.

In another embodiment of the present invention, in the step (1), the reed is preprocessed before being segmented, and the preprocessing method includes: removing the flower spike and most leaves of the reed, preferably removing 70-80% of the leaves by mass.

The segmentation treatment specifically comprises the steps of controlling the reed to be cut into 3-6cm small segments, and adding 50-80 ℃ water for cleaning for 5-10 minutes;

in another embodiment of the present invention, in the step (2), the alkali is potassium hydroxide, and the pH is 11 to 12.

The specific method for carrying out the hot steam treatment comprises the following steps: treating with 90-105 deg.C hot steam for 15-20 min.

In another embodiment of the invention, in the step (3), the thread rolling compression ratio is controlled to be 1: 1-4, so that the uniform and good extrusion and thread separation effect of the reeds is achieved, the subsequent treatments such as enzymolysis and the like are facilitated, and meanwhile, the energy consumption can be reduced.

The compound biological enzyme is any two or three of xylanase, cellulase and lipase, preferably any two of the xylanase, the cellulase and the lipase, and the cellulase and the xylanase.

In another specific embodiment of the invention, the total amount of the complex enzyme is controlled to be 20-40U/g, and the compounding ratio (enzyme activity) is 1: 3-3: 1; the treatment temperature is 45-60 ℃, the pH value is 6.0-8.0, and the liquid ratio is controlled to be 1: 3.5-5; the complex enzyme treatment time is controlled to be 20-80 min. By adopting the complex enzyme for cooperative treatment and optimizing relevant process parameter conditions, the performance of the pulp can be effectively improved, and simultaneously, the energy consumption of pulping is favorably reduced. Moreover, by optimizing the enzyme activity ratio, the fertilizer effect components of the fertilizer in the produced wastewater are richer, and the use of the biomass fertilizer is facilitated.

In another embodiment of the invention, the complex enzyme treatment process is carried out with uniform interval stirring; thereby leading the reed and the compound biological enzyme to fully act and being used for further softening the reed raw material.

In another embodiment of the present invention, in the step (4), the refining process specifically includes: carrying out high-concentration grinding, wherein the rotating speed of a main shaft is 2800-;

in another embodiment of the present invention, in the step (6), the high concentration washing wastewater is treated by an MVR evaporator and evaporated and concentrated to obtain a solid, the solid is adjusted to a neutral pH value by using a trace amount of phosphoric acid, and then granulated to obtain the biomass compound fertilizer, the fertilizer contains a proper amount of K, P element and a large amount of easily degradable reed straw components with small particles, the whole production process is green and environment-friendly, and the comprehensive high-value full utilization of reeds is realized.

In another embodiment of the present invention, there is provided a mechanical pulp and/or biomass compound fertilizer prepared by the above method.

In still another embodiment of the present invention, there is provided a use of the above-mentioned mechanical pulp for preparing a unbleached wrapping paper, a paper-based material and/or a use of a biomass compound fertilizer as a fertilizer.

In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments. The test methods in the following examples, which are not specified under specific conditions, are generally carried out under conventional conditions.

The biological enzyme adopted in the embodiment of the invention is from Shandong Kete enzyme preparation limited company and Novexin biological enzyme preparation China company.

Example 1 method for preparing natural-color biomechanical pulp based on reed and fully utilizing byproducts

The method comprises the following steps:

1. removing flower spikes and leaves with the mass fraction of 70% from the preprocessed reed, and cutting the reed into small sections of 3-6 cm; adding water with the temperature of 60 ℃ for cleaning for 10 minutes, and then dehydrating;

2. adding potassium hydroxide to the reed section dehydrated and washed in the step 1 to adjust the pH value to about 12, and then introducing 105 ℃ hot steam for treatment for 15 minutes;

3. carrying out thread separation treatment on the reed treated in the step 2, controlling the thread rolling compression ratio to be 1:3, and adjusting the pH value to be neutral;

4. adding composite biological enzyme into the reed raw material obtained in the step 3 for treatment, wherein the total dosage of the two biological enzymes (xylanase and lipase) is 40U/g (40U biological enzyme is added into 1g of feed liquid), the compounding ratio (enzyme activity) is 3:1, and the condition of composite enzyme treatment is that the liquid ratio is 1:4 (g/mL); the treatment temperature is 50 deg.C, pH is 7.0, and the treatment time is 50 min.

5. Carrying out high-concentration pulping on the softened reed brown pulp obtained in the step 4, wherein the rotating speed of a main shaft is 3000r/min, two-stage pulping is adopted, and the pulping clearance is 0.2 mm;

6. and (3) carrying out high-concentration washing on the slurry obtained in the step (5), treating high-concentration washing wastewater by using an MVR (mechanical vapor recompression) evaporator, evaporating and concentrating to obtain a solid matter, adjusting the pH value of the solid matter to be neutral by using trace phosphoric acid, and then granulating to obtain the biomass compound fertilizer.

Meanwhile, a control group was set, which was different only in that: in step 4, the reed processed in step 3 was not treated with complex biological enzyme, and the liquid ratio was adjusted to 1:4(g/mL) by adding water alone.

TABLE 1 comparison of physical Properties of pulp obtained by a method for preparing natural-color biomechanical pulp based on Phragmites communis and full utilization of by-products (xylanase: lipase ═ 3:1)

Embodiment 2 method for preparing natural-color biomechanical pulp based on reed and fully utilizing byproducts

The method comprises the following steps:

1. removing flower spikes and leaves with the mass fraction of 70% from the preprocessed reed, and cutting the reed into small sections of 3-6 cm; adding 80 ℃ water for cleaning for 10 minutes, and then dehydrating;

2. adding potassium hydroxide to the reed section dehydrated and washed in the step 1 to adjust the pH value to about 12, and then introducing 100 ℃ hot steam for treatment for 15 minutes;

3. carrying out thread separation treatment on the reed treated in the step 2, controlling the thread rolling compression ratio to be 1:2, and adjusting the pH value to be about neutral;

4. adding composite biological enzyme into the reed raw material obtained in the step 3 for treatment, wherein the total dosage of the two biological enzymes (xylanase: cellulase) is 30U/g (30U biological enzyme is added into 1g of feed liquid), the compounding ratio (enzyme activity) is 2:1, and the condition of composite enzyme treatment is that the liquid ratio is 1:4 (g/mL); the treatment temperature is 55 deg.C, pH is 7.0, and the treatment time is 40 min.

5. Carrying out high-concentration pulping on the softened reed brown pulp obtained in the step 4, wherein the rotating speed of a main shaft is 3000r/min, two-stage pulping is adopted, and the pulping clearance is 0.3 mm;

6. and (3) carrying out high-concentration washing on the slurry obtained in the step (5), treating high-concentration washing wastewater by using an MVR (mechanical vapor recompression) evaporator, evaporating and concentrating to obtain a solid matter, adjusting the pH value of the solid matter to be neutral by using trace phosphoric acid, and then granulating to obtain the biomass compound fertilizer.

Meanwhile, a control group was set, which was different only in that: in step 4, the reed processed in step 3 was not treated with complex biological enzyme, and the liquid ratio was adjusted to 1:4(g/mL) by adding water alone.

TABLE 2 comparison of physical Properties of pulp obtained by a method for preparing natural-color biomechanical pulp based on Phragmites communis and full utilization of by-products (xylanase: cellulase ═ 2:1)

Embodiment 3 method for preparing natural-color biomechanical pulp based on reed and fully utilizing byproducts

The method comprises the following steps:

1. removing flower spikes and leaves with the mass fraction of 80% from the preprocessed reed, and cutting the reed into small sections of 3-6 cm; adding 80 ℃ water for cleaning for 10 minutes, and then dehydrating;

2. adding potassium hydroxide to the reed section dehydrated and washed in the step 1 to adjust the pH value to about 12, and then introducing hot steam at the temperature of 95 ℃ for treatment for 20 minutes;

3. carrying out thread separation treatment on the reed treated in the step 2, controlling the thread rolling compression ratio to be 1:3, and adjusting the pH value to be about neutral;

4. adding composite biological enzyme into the reed raw material obtained in the step 3 for treatment, wherein the total dosage of two biological enzymes (lipase: cellulase 2:1) is 30U/g (30U of biological enzyme is added into 1g of feed liquid), the compounding ratio (enzyme activity) is 2:1, and the condition of composite enzyme treatment is that the liquid ratio is 1:5 (g/mL); the treatment temperature is 50 deg.C, pH is 7.0, and the treatment time is 60 min.

5. Carrying out high-concentration pulping on the softened reed brown pulp obtained in the step 4, wherein the rotating speed of a main shaft is 3000r/min, two-stage pulping is adopted, and the pulping clearance is 0.2 mm;

6. and (3) carrying out high-concentration washing on the slurry obtained in the step (5), treating high-concentration washing wastewater by using an MVR (mechanical vapor recompression) evaporator, evaporating and concentrating to obtain a solid matter, adjusting the pH value of the solid matter to be neutral by using trace phosphoric acid, and then granulating to obtain the biomass compound fertilizer.

Meanwhile, a control group was set, which was different only in that: in step 4 of the control group, the reed subjected to the step 3 is not treated by using the compound biological enzyme, and the liquid ratio is adjusted to 1:5 only by adding water.

TABLE 3 comparison of physical Properties of pulp obtained by a method for preparing natural-color biomechanical pulp based on Phragmites communis and full utilization of byproducts (Lipase: cellulase ═ 2:1)

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.