A cellulose nanonization treatment device

Abstract

The utility model provides a cellulose nanometer treatment device, cellulose nanometer treatment device includes the pretreatment subassembly, at least 2 groups parallelly connected micro -nanometer component, nanometer component and finished product collection part that connect gradually, nanometer component includes at least 3 homogenizing parts that connect in series, cellulose nanometer treatment device has realized the continuous production of nanocellulose, and the nanocellulose of production obtains is small and is evenly distributed, and the nanocellulose content of diameter < 100nm accounts for 90wt% above of nanocellulose total content, and simple structure, convenient operation, stable operation, low energy consumption.

Description

Technical Field

[0001] This utility model belongs to the technical field of nano-processing equipment, specifically relating to a cellulose nano-processing device. Background Technology

[0002] Nanocellulose is made from plant fibers, and its preparation methods are mainly divided into mechanical and chemical methods. A representative chemical method is the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxygen radical) oxidation method. Although this method can effectively produce nanocellulose, the chemical reagent TEMPO used has very high toxicity and is difficult to recover, resulting in very high production costs. Mechanical methods mainly utilize mechanical processing such as crushing and grinding to nano-size high-purity plant fibers.

[0003] However, the equipment currently used for nano-cellulose production is mainly high-pressure homogenizers or micro-jet high-pressure homogenizers. Since nano-cellulose production needs to be carried out under high pressure (generally between 800 bar and 1500 bar), the requirements for equipment parts and wear are extremely high. Furthermore, multiple nano-cellulose production processes are required, resulting in high energy consumption and high mechanical strength. Consequently, the production cost is also very high, which is far from meeting the application needs of nanocellulose.

[0004] For example, CN208454861U discloses an apparatus for preparing nanocellulose, which includes a pulverizing device, a reaction vessel, a water tank, an acid / alkali tank, a homogenizing device, a disc milling device, an ultrasonic pulverizing device, and a freeze-drying device. This apparatus has limited effect on nano-sizing of cellulose, but still has a significant improvement effect. Moreover, its structure is complex, inconvenient to operate, and has high energy consumption.

[0005] In view of the above situation, this utility model provides a cellulose nanofiber processing device to solve the problem that traditional equipment for preparing nanocellulose needs to be carried out under high pressure, which has extremely high requirements for equipment and wear and tear, and achieves high-efficiency, low-cost and continuous production of nanocellulose. Utility Model Content

[0006] To address the problems existing in the prior art, the purpose of this utility model is to provide a cellulose nanofiber processing device. By designing a pretreatment component, a micro-nanofiber component, a nanofiber component, and a finished product collection component connected in sequence, cellulose is gradually degraded to achieve continuous production of nanocellulose, with low equipment requirements and low energy consumption.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] This utility model provides a cellulose nano-processing device, which includes a pretreatment component connected in sequence, at least two sets of micro-nano components connected in parallel (e.g., two, three, four or five sets, etc.), nano-components, and a finished product collection component.

[0009] The nano-component comprises at least three homogeneous components connected in series (e.g., three, four, five, or six, etc.).

[0010] The cellulose nanofiber processing device of this invention, through the design of a pretreatment component connected in sequence, at least two sets of parallel micro-nanofiber components, a nanofiber component and a finished product collection component, and a homogenizing component including at least three series-connected components, allows cellulose to undergo preliminary degradation, then degradation to the micro-nano level, and finally degradation to the nano level, thereby improving the cellulose nanofiber effect and realizing the continuous and efficient production of nanocellulose. Compared with the traditional preparation of nanocellulose using a high-pressure homogenizer or a micro-jet high-pressure homogenizer, it reduces the working pressure of the homogenizer, significantly reduces the number of nanofiber processes, reduces energy consumption and wear on equipment, and thus reduces the preparation cost.

[0011] The cellulose nanofiber processing device provided by this invention is suitable for the cellulose nanofiber processing of various plant fiber raw materials, such as woody biomass and / or grass biomass.

[0012] The following are preferred technical solutions of this utility model, but are not intended to limit the technical solutions provided by this utility model. Through the following preferred technical solutions, the purpose and beneficial effects of this utility model can be better achieved.

[0013] Preferably, the pretreatment component includes a first storage component and a pretreatment component connected in sequence.

[0014] Preferably, the pretreatment component includes a trough-type pulper.

[0015] The present invention further preferably includes a trough pulper as the pretreatment component, which has the functions of separating, dispersing, cutting and refining cellulose, and can achieve the initial degradation of cellulose.

[0016] Preferably, a first conveying component is provided between the first storage component and the pretreatment component.

[0017] Preferably, a first stirring element is provided at the bottom of the first storage component.

[0018] In a further preferred embodiment of this invention, a first stirring element is provided at the bottom of the first storage component, and the first stirring element is used for the initial dispersion of plant cellulose raw materials in the first storage component.

[0019] Preferably, the first conveying component includes a first diaphragm pump.

[0020] Preferably, a first monitoring component is provided at the bottom of the pretreatment component.

[0021] In a further preferred embodiment, the pretreatment component is provided with a first monitoring component at its bottom. The first monitoring component is used for online monitoring of the plant cellulose in the pretreatment component, and the number of pulping cycles of the pretreatment component, i.e., the trough pulper, is determined according to different materials and different processing requirements.

[0022] Preferably, the cellulose nanofiber processing device includes 2 to 4 sets of micro-nano components connected in parallel, for example, 2 sets, 3 sets or 4 sets.

[0023] The present invention further preferably includes 2 to 4 sets of parallel-connected micro-nano components for simultaneously performing micro-nano processing and nano-processing. Specifically, for example, when the cellulose nano-processing device includes 2 sets of parallel-connected micro-nano components, one set of micro-nano components transports the material to the subsequent nano-processing component for nano-processing, while the other set performs micro-nano processing on the new raw material, thereby ensuring continuous feeding, continuous production, and stable operation of the homogenizing components.

[0024] Preferably, the micro-nano component includes a second storage component and a micro-nano processing component connected in sequence.

[0025] Preferably, the micro / nano-processed component includes a colloidal pump.

[0026] The present invention further preferably includes a colloid pump in the micro-nano processing component, which can perform repeated grinding, dispersion, homogenization and emulsification to achieve micro-nano processing of the initially degraded cellulose so that its size reaches the micro-nano level.

[0027] Preferably, a second conveying component is provided between the second storage component and the micro / nano processing component.

[0028] Preferably, a second stirring element is provided at the bottom of the second storage component.

[0029] The present invention further preferably includes a second stirring element at the bottom of the second storage component to prevent cellulose from precipitating and cross-linking into clumps.

[0030] Preferably, the second conveying component includes a second diaphragm pump.

[0031] In this invention, the second feeding component and the micro-nano processing component operate in series. The second feeding component provides a stable flow rate to the micro-nano processing component, and this part circulates until the cellulose size reaches the micro-nano level and then stops circulating.

[0032] Preferably, a second monitoring component is provided at the bottom of the second storage component.

[0033] In a further preferred embodiment of this invention, a second monitoring component is provided at the bottom of the second storage component. The second monitoring component is used to monitor online whether the size of the cellulose in the second storage component, i.e. the size of the cellulose in the micro-nano cycle processing process, reaches the micro-nano level, and to determine whether the micro-nano component is operating.

[0034] Preferably, the nano-component comprises 3 to 5 homogeneous components connected in series, such as 3, 4 or 5.

[0035] The present invention further preferably includes 3 to 5 homogeneous components connected in series, which helps to ensure the nano-sizing effect of cellulose while ensuring low energy consumption.

[0036] Preferably, the nanomaterial component further includes a buffer component disposed between two adjacent homogeneous components.

[0037] The present invention further preferably includes a buffer component disposed between two adjacent homogenizing components. The buffer component is used to provide a stable feed to the homogenizing component, so as to avoid the subsequent homogenizing component from having unstable pressure due to discontinuous feeding, thereby affecting the nano-processing effect, causing wear to the homogenizing component, and increasing energy consumption and cost.

[0038] Preferably, a third conveying component is provided between the homogenizing component and the buffer component.

[0039] Preferably, the third conveying component includes a third diaphragm pump.

[0040] The continuous operation method of the cellulose nano-processing device provided by this utility model specifically includes the following steps:

[0041] (1) Cellulose pretreatment: Add cellulose to the first storage component, add water to adjust the concentration of cellulose to 1%~10%, turn on the first stirring component for preliminary dispersion, and transport it to the trough pulper for circulating pulping through the first conveying component, and determine the pretreatment effect through the first monitoring component;

[0042] (2) Cellulose micro-nano treatment: The cellulose pretreated in step (1) is transported to the second storage component, the second stirring component is turned on to stir evenly, and then transported to the colloidal pump for circulation treatment via the diaphragm pump, and the micro-nano treatment effect is determined by the second monitoring component.

[0043] (3) Cellulose nano-processing: The cellulose after micro-nano processing in step (2) is transported to the first homogenizing component, and the working pressure is set to 200~500 bar. Then it is transported to the buffer component via a diaphragm pump. When the liquid level in the first buffer component reaches 30%~50%, it is transported to the next homogenizing component via a diaphragm pump, and the working pressure is set to 800~1300 bar. This process continues until the cellulose is processed by the last homogenizing component and then directly enters the finished product collection component.

[0044] The numerical range described in this utility model includes not only the point values ​​listed above, but also any point values ​​within the numerical range that are not listed. Due to space limitations and for the sake of brevity, this utility model will not exhaustively list all the specific point values ​​included in the range.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] (1) The cellulose nanofiber processing device provided by this utility model connects the pretreatment component, the micro-nanofiber component and the nanofiber component in sequence to gradually degrade cellulose, including preliminary degradation, degradation to the micro-nano level and degradation to the nano level in sequence. Moreover, it can be recycled to realize the continuous production of nanocellulose. The content of nanocellulose with a diameter of less than 100nm accounts for more than 90wt% of the total content of nanocellulose. Compared with the traditional high pressure homogenizer or micro-jet high pressure homogenizer, the nanocellulose device of this utility model greatly reduces the number of nanofibers, reduces energy consumption and wear on the high pressure homogenizer, and has a lower preparation cost.

[0047] (2) The cellulose nano-processing device provided by this utility model further optimizes the setting of 2 to 4 sets of parallel micro-nano components, and optimizes the setting of 3 to 5 series-connected homogenizing components, as well as the setting of the first stirring component and the second stirring component. This improves the cellulose nano-processing effect, reduces the number of nano-processing times, improves the nano-processing efficiency, and reduces production energy consumption. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the structure and connection relationship of the cellulose nano-processing device provided in Embodiment 1 of this utility model.

[0049] Explanation of reference numerals in the attached drawings: 1. First storage tank; 2. First diaphragm pump; 3. Tank-type pulper; 4. Second storage tank; 5. Second diaphragm pump; 6. Colloid pump; 7. First homogenizer; 8. Buffer tank; 9. Third diaphragm pump; 10. Second homogenizer; 11. Third homogenizer; 12. Fourth homogenizer; 13. Finished product collection tank. Detailed Implementation

[0050] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of this utility model and should not be considered as specific limitations thereof.

[0051] It should be understood that in the description of this utility model, terms such as "bottom," "series," and "parallel" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Terms such as "first" and "second" do not indicate the importance of components and therefore should not be construed as limitations on this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the scope of protection of this utility model.

[0052] I. Implementation Examples

[0053] Example 1

[0054] This embodiment provides a cellulose nanofiber processing device, such as... Figure 1 As shown, the cellulose nanofiber processing device includes a pretreatment component connected in sequence, two sets of micro-nanofiber components connected in parallel, a nanofiber component, and a finished product collection tank 13; the pretreatment component is a trough-type pulper 3; a first monitoring component is provided at the bottom of the pretreatment component;

[0055] The pretreatment assembly includes a first storage tank 1, a first diaphragm pump 2, and a trough-type pulper 3 connected in sequence; a first stirring element is provided at the bottom of the first storage tank 1;

[0056] The micro-nano component includes a second storage tank 4, a second diaphragm pump 5, and a colloidal pump 6 connected in sequence; a second monitoring component is provided at the bottom of the second storage tank 4; a second stirring component is provided at the bottom of the second storage tank 4;

[0057] The nanomaterial assembly includes four homogenizers connected in series, a buffer tank 8 disposed between two adjacent homogenizers, and a third diaphragm pump 9 disposed between the homogenizers and the buffer tank 8. The four homogenizers connected in series are, in order, a first homogenizer 7, a second homogenizer 10, a third homogenizer 11, and a fourth homogenizer 12.

[0058] The cellulose nanofiber processing device described in this embodiment can continuously produce nanocellulose with a diameter of 10~90nm, and the distribution is uniform. The content of nanocellulose with a diameter of <100nm accounts for 95wt% of the total content of nanocellulose. The homogenizer has a low working pressure and low production energy consumption.

[0059] Example 2

[0060] This embodiment provides a cellulose nano-sizing processing device, which includes a pretreatment component connected in sequence, three sets of micro-nano-sizing components connected in parallel, a nano-sizing component, and a finished product collection tank; the pretreatment component is a trough-type pulper; a first monitoring component is provided at the bottom of the pretreatment component;

[0061] The pretreatment assembly includes a first storage tank, a first diaphragm pump, and a trough-type pulper connected in sequence; a first stirring element is provided at the bottom of the first storage tank;

[0062] The micro-nano component includes a second storage tank, a second diaphragm pump, and a colloid pump connected in sequence; a second monitoring component is provided at the bottom of the second storage tank; a second stirring component is provided at the bottom of the second storage tank;

[0063] The nanomaterial assembly includes three homogenizers connected in series, a buffer tank disposed between two adjacent homogenizers, and a third diaphragm pump disposed between the homogenizers and the buffer tank.

[0064] The cellulose nanofiber device described in this embodiment has the same effect on cellulose nanofiber formation as in Example 1. After treatment, the content of nanocellulose with a diameter of <100nm accounts for 92wt% of the total nanocellulose content.

[0065] Example 3

[0066] This embodiment provides a cellulose nano-processing device, which includes a pretreatment component connected in sequence, four sets of micro-nano-processing components connected in parallel, a nano-processing component, and a finished product collection tank; the pretreatment component is a trough-type pulper; a first monitoring component is provided at the bottom of the pretreatment component;

[0067] The pretreatment assembly includes a first storage tank, a first diaphragm pump, and a trough-type pulper connected in sequence; a first stirring element is provided at the bottom of the first storage tank;

[0068] The micro-nano component includes a second storage tank, a second diaphragm pump, and a colloid pump connected in sequence; a second monitoring component is provided at the bottom of the second storage tank; a second stirring component is provided at the bottom of the second storage tank;

[0069] The nanomaterial assembly includes five homogenizers connected in series, a buffer tank disposed between two adjacent homogenizers, and a third diaphragm pump disposed between the homogenizers and the buffer tank.

[0070] The cellulose nanofiber device described in this embodiment has the same effect on cellulose nanofiber as in Embodiment 1 or Embodiment 2. After treatment, the content of nanocellulose with a diameter of <100nm accounts for 93wt% of the total content of nanocellulose.

[0071] Example 4

[0072] This embodiment provides a cellulose nano-processing device, which is the same as that in Embodiment 1 except that it does not have a first stirring element.

[0073] The cellulose nano-processing device described in this embodiment lacks the first stirring element, resulting in uneven dispersion of cellulose raw materials in the first storage component. This affects the uniform feeding of subsequent micro-nano components, leading to poor nano-processing effect and unstable device operation.

[0074] Example 5

[0075] This embodiment provides a cellulose nano-processing device, which is the same as that in Embodiment 1 except that it does not have a second stirring element.

[0076] The cellulose nanofiber processing device described in this embodiment does not have a second stirring element, which causes the cellulose in the second storage component to easily precipitate and crosslink into clumps, resulting in unstable feeding when it enters the nanofiber component and affecting the nanofiber effect.

[0077] Example 6

[0078] This embodiment provides a cellulose nano-processing device, which is the same as that in Embodiment 1 except that there is no buffer tank between two adjacent homogenizers.

[0079] In this embodiment, the lack of a buffer tank in the cellulose nano-processing device leads to unstable feeding of the homogenizing component, resulting in discontinuous feeding and unstable pressure. This, in turn, affects the nano-processing effect, causes wear on the homogenizing component, and increases energy consumption and cost.

[0080] II. Comparative Example

[0081] Comparative Example 1

[0082] This comparative example provides a cellulose nano-processing device. Except for the absence of a trough pulper, i.e., the absence of a pretreatment component, the cellulose nano-processing device is the same as that in Example 1.

[0083] In this comparative example, because the cellulose nano-processing device does not have a pretreatment component, it cannot perform preliminary dispersion but directly performs micro-nano processing, resulting in excessively large particles, unstable feeding, and the inability of the micro-nano processing component to operate normally, thus failing to achieve nano-processing.

[0084] Comparative Example 2

[0085] This comparative example provides a cellulose nano-processing device, which is identical to Example 1 except for having only one set of micro-nano components.

[0086] In this comparative example, the cellulose nano-processing device only has one set of micro-nano components, which not only leads to unstable subsequent feeding and reduces the nano-processing effect, but also makes continuous production impossible.

[0087] Comparative Example 3

[0088] This comparative example provides a cellulose nano-processing device, which is identical to that of Example 1 except for having only one homogenizing component.

[0089] In this comparative example, the cellulose nano-processing device only has one homogenizing component, which leads to excessive load on the homogenizer, causing wear and tear, increasing the number of nano-processing cycles, and significantly reducing the nano-processing effect.

[0090] In summary, this utility model provides a cellulose nanofiber processing device, which combines a pretreatment component, at least two sets of parallel-connected micro-nanofiber components, and a homogeneous nanofiber component including at least three series-connected components to achieve continuous production of nanocellulose. The content of nanocellulose with a diameter <100nm accounts for more than 90wt% of the total nanocellulose content. Moreover, the cellulose nanofiber processing device has a simple structure, is easy to operate, is stable during operation, and has less wear.

[0091] The applicant declares that the detailed structural features of this utility model are illustrated through the above embodiments, but this utility model is not limited to the above detailed structural features, that is, it does not mean that this utility model must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvements to this utility model, equivalent substitutions of selected components, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection and disclosure scope of this utility model.

Claims

1. A cellulose nano-processing device, characterized in that, The cellulose nanofiber processing device includes a pretreatment component connected in sequence, at least two sets of micro-nanofiber components connected in parallel, a nanofiber component, and a finished product collection component; The nano-component comprises at least three homogeneous components connected in series.

2. The cellulose nano-processing device according to claim 1, characterized in that, The pretreatment component includes a first storage component and a pretreatment component connected in sequence; The pretreatment components include a trough-type pulper.

3. The cellulose nano-processing device according to claim 2, characterized in that, A first conveying component is provided between the first storage component and the pretreatment component; The first storage component is provided with a first stirring element at its bottom.

4. The cellulose nano-processing device according to claim 3, characterized in that, The first conveying component includes a first diaphragm pump; The pretreatment component has a first monitoring component at its bottom.

5. The cellulose nano-processing device according to claim 1, characterized in that, The cellulose nanofiber processing device includes 2 to 4 sets of micro-nanofiber components connected in parallel.

6. The cellulose nano-processing device according to claim 1, characterized in that, The micro-nano component includes a second storage component and a micro-nano processing component connected in sequence. The micro / nano-processed component includes a colloidal pump.

7. The cellulose nano-processing device according to claim 6, characterized in that, A second material conveying component is provided between the second material storage component and the micro-nano processing component; The second storage component is provided with a second stirring element at its bottom.

8. The cellulose nano-processing device according to claim 7, characterized in that, The second conveying component includes a second diaphragm pump; A second monitoring component is provided at the bottom of the second storage component.

9. The cellulose nano-processing device according to claim 1, characterized in that, The nano-component comprises 3 to 5 homogeneous components connected in series.

10. The cellulose nano-processing device according to claim 1, characterized in that, The nano-sized component also includes a buffer component disposed between two adjacent homogeneous components; A third material conveying component is provided between the homogenizing component and the buffer component; The third conveying component includes a third diaphragm pump.

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