Liquid feed system, liquid feed method, and manufacturing method of composition

Abstract

To provide a liquid feed system that can feed a fibrous cellulose dispersion with high viscosity and low flowability efficiently, a liquid feed method, and a manufacturing method of a composition containing a fibrous cellulose utilizing the liquid feed method.SOLUTION: A liquid feed system has: an initial liquid feed unit having a tank capable of being filled with a fibrous cellulose dispersion, a piping, and a pump that enables the fibrous cellulose dispersion filled in the tank to be fed to the piping; and at least one relay liquid feed unit having a relay tank capable of being filled with the fibrous cellulose dispersion discharged from the piping, a relay piping, and a relay pump that enables the fibrous cellulose dispersion filled in the relay tank to be fed to the relay piping, wherein a viscosity of the fibrous cellulose dispersion is 100,000 mPa s or over and a total length of the piping and the relay piping is a specified length.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a system for delivering a fibrous cellulose dispersion, a method for delivering a fibrous cellulose dispersion, and a method for producing a fibrous cellulose-containing composition. [Background technology]

[0002] In recent years, materials made from renewable natural fibers have been attracting attention as an alternative to petroleum resources and due to growing environmental awareness. Among natural fibers, fibrous cellulose with a fiber diameter of 10 μm to 50 μm, especially wood-derived fibrous cellulose (pulp), has been widely used mainly in paper products.

[0003] As fibrous cellulose, fine fibrous cellulose with an average fiber width of 1000 nm or less is also known. Fine fibrous cellulose has attracted attention as a new material and has a wide range of applications. For example, the development of sheets, resin composites, and thickeners containing fine fibrous cellulose is underway. Furthermore, composite materials in which fine fibrous cellulose is combined with resin emulsions and / or rubber latex are being considered.

[0004] Patent Document 1 discloses a method for producing anion-modified cellulose nanofibers. Specifically, the method discloses a method for producing anion-modified cellulose nanofibers by defibrating anion-modified cellulose, desalting it using a cation exchange resin, and then recovering the cation exchange resin. Between the desalting step and the recovery step, a step of pumping a mixture containing anion-modified cellulose nanofibers and a cation exchange resin is provided, and the disclosed pump is capable of pumping highly viscous cellulose nanofibers.

[0005] Patent Document 2 discloses that mono pumps and positive displacement twin screw pumps are broadly classified as positive displacement screw pumps, have a high head, and are capable of pumping fluids with relatively high viscosity. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2019 / 059079 [Patent Document 2] Japanese Patent Application Publication No. 2018-135421 Summary of the Invention [Problem to be solved by the invention]

[0007] Because fibrous cellulose dispersions have a relatively high viscosity and low fluidity, pressure loss during transport is large. In other words, when attempting to transport a fibrous cellulose dispersion over a long distance through piping, excessive pressure, heat, and other loads are applied to the vicinity of the pump at the transport source. Furthermore, if the pump head is low, the fibrous cellulose dispersion cannot be transported. The present invention aims to provide a liquid delivery system and a liquid delivery method that can efficiently deliver a highly viscous, poorly fluid fibrous cellulose dispersion, and a method for producing a fibrous cellulose-containing composition using the method. [Means for solving the problem]

[0008] As a result of extensive research, the present inventors have found that the above-mentioned problems can be solved by providing a relay liquid transfer unit between the liquid transfer source and the liquid transfer destination. That is, the present invention includes the following.

[0009] [1] A tank capable of being filled with a fibrous cellulose dispersion; Piping and an initial liquid-transporting unit including a pump that can transport the fibrous cellulose dispersion filled in the tank to the piping; and a relay tank capable of filling the fibrous cellulose dispersion discharged from the piping; and Relay piping; at least one relay liquid-transporting unit including a relay pump that enables the fibrous cellulose dispersion filled in the relay tank to be transported to the relay pipe, the viscosity of the fibrous cellulose dispersion is 100,000 mPa s or more; The total length of the piping and the relay piping is 10 m or more, the length of the pipe is such that the speed of the fibrous cellulose dispersion discharged from the pipe is 10 L / min or more, A liquid delivery system, wherein the length of the relay pipe is such that the speed of the fibrous cellulose dispersion discharged from the relay pipe is 10 L / min or more. [2] The liquid delivery system according to [1], wherein the lengths L of the pipe and the relay pipe each satisfy the following formula, where μ (mPa·s) is the viscosity of the fibrous cellulose dispersion: L<-99.32ln(μ)+1322.1 [3] The liquid transfer system according to [1] or [2], wherein the pump and the relay pump are each independently a mono pump or a positive displacement twin screw pump. [4] A liquid transfer system according to any one of [1] to [3], wherein the pump and the relay pump are capable of transferring liquid so that the pressure on the discharge side of the pump and the relay pump is 0.8 MPaG or less, respectively. [5] The liquid transfer system according to any one of [1] to [4], wherein the inner diameter of the pipe and the relay pipe is 100 mm or less. [6] The liquid transfer system according to any one of [1] to [5], wherein the capacity of the relay tank is smaller than the capacity of the tank. [7] A method for delivering a fibrous cellulose dispersion, comprising: sending the fibrous cellulose dispersion filled in a tank to a pipe using a pump; filling the fibrous cellulose dispersion discharged from the piping into a relay tank; and sending the fibrous cellulose dispersion filled in the relay tank to a relay pipe by a relay pump, the viscosity of the fibrous cellulose dispersion is 100,000 mPa s or more; The total length of the piping and the relay piping is 10 m or more, the length of the pipe is such that the speed of the fibrous cellulose dispersion discharged from the pipe is 10 L / min or more, The method, wherein the length of the relay pipe is such that the speed of the fibrous cellulose dispersion discharged from the relay pipe is 10 L / min or more. [8] The method according to [7], wherein the length L of the pipe and the relay pipe respectively satisfies the following formula when the viscosity of the fibrous cellulose dispersion is μ (mPa·s): L<-99.32ln(μ)+1322.1 [9] The method according to [7] or [8], wherein the pump and the relay pump are each independently a mono pump or a positive displacement twin screw pump.

[10] The method according to any one of [7] to [9], wherein the pressure on the discharge side of the pump and the relay pump when the fibrous cellulose dispersion is pumped by the pump and the relay pump is 0.8 MPaG or less.

[11] The method according to any one of [7] to

[10] , wherein the inner diameter of the pipe and the relay pipe is 100 mm or less.

[12] The capacity of the relay tank is smaller than the capacity of the tank. [7] to

[11] A method according to any one of the preceding claims.

[13] A method for producing a fibrous cellulose-containing composition, comprising the step of delivering a fibrous cellulose dispersion liquid by the method according to any one of [7] to

[12] . [Effects of the Invention]

[0010] According to the present invention, a fibrous cellulose dispersion liquid having high viscosity and low fluidity can be efficiently transported over long distances. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a liquid delivery system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be described in detail below, but the explanation of the constituent elements described below is one example (typical example) of an embodiment of the present invention, and the present invention is not limited to these contents and can be practiced in various modifications within the scope of the gist. In this specification, a numerical range expressed using "to" means a range that includes the numerical values ​​written before and after "to" as the lower and upper limits.

[0013] One embodiment of the present invention comprises: a tank capable of being filled with a fibrous cellulose dispersion; Piping and an initial liquid-transporting unit including a pump that can transport the fibrous cellulose dispersion filled in the tank to the piping; and a relay tank capable of filling the fibrous cellulose dispersion discharged from the piping; and Relay piping; at least one relay liquid-transporting unit including a relay pump that enables the fibrous cellulose dispersion filled in the relay tank to be transported to the relay pipe, the viscosity of the fibrous cellulose dispersion is 100,000 mPa s or more; The total length of the piping and the relay piping is 10 m or more, the length of the pipe is such that the speed of the fibrous cellulose dispersion discharged from the pipe is 10 L / min or more, In the liquid delivery system, the length of the relay pipe is such that the speed of the fibrous cellulose dispersion discharged from the relay pipe is 10 L / min or more.

[0014] The liquid delivery system according to this embodiment can efficiently deliver a fibrous cellulose dispersion to a location 10 m or more away. That is, another embodiment of the present invention is A method for delivering a fibrous cellulose dispersion, comprising: sending the fibrous cellulose dispersion filled in a tank to a pipe using a pump; filling the fibrous cellulose dispersion discharged from the piping into a relay tank; and sending the fibrous cellulose dispersion filled in the relay tank to a relay pipe by a relay pump, the viscosity of the fibrous cellulose dispersion is 100,000 mPa s or more; The total length of the piping and the relay piping is 10 m or more, the length of the pipe is such that the speed of the fibrous cellulose dispersion discharged from the pipe is 10 L / min or more, The length of the relay pipe is such that the speed of the fibrous cellulose dispersion liquid discharged from the relay pipe is 10 L / min or more (hereinafter, this may be referred to as "a liquid delivery method according to one embodiment of the present invention").

[0015] <Fibrous cellulose dispersion> A fibrous cellulose dispersion refers to a liquid in which fibrous cellulose is dispersed in a dispersion medium. The dispersion medium can be one or more selected from water and organic solvents such as polar organic solvents. The polar organic solvent is not particularly limited, but examples thereof include alcohols, polyhydric alcohols, ketones, ethers, esters, and aprotic polar solvents. Examples of alcohols include methanol, ethanol, isopropanol, n-butanol, and isobutyl alcohol. Examples of polyhydric alcohols include ethylene glycol, propylene glycol, and glycerin. Examples of ketones include acetone and methyl ethyl ketone (MEK). Examples of ethers include diethyl ether, tetrahydrofuran, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-butyl ether, and propylene glycol monomethyl ether. Examples of esters include ethyl acetate and butyl acetate. Examples of aprotic polar solvents include dimethyl sulfoxide (DMSO), dimethylformamide (DMF), dimethylacetamide (DMAc), and N-methyl-2-pyrrolidinone (NMP).

[0016] The fibrous cellulose may be a modified product, and may be fibrous cellulose or a modified product thereof that has been defibrated and beaten. The fibrous cellulose may be a fine fibrous cellulose. The fine fibrous cellulose is not particularly limited, and any known fine fibrous cellulose may be used.

[0017] The maximum fiber width of the fine fibrous cellulose is preferably 1000 nm or less, more preferably 100 nm or less, even more preferably 50 nm or less, even more preferably 20 nm or less, and particularly preferably 10 nm or less.

[0018] The number-average fiber width of the fine fibrous cellulose is, for example, 1000 nm or less. The number-average fiber width of the fine fibrous cellulose is, for example, preferably 2 nm or more and 1000 nm or less, more preferably 2 nm or more and 100 nm or less, even more preferably 2 nm or more and 50 nm or less, and particularly preferably 2 nm or more and 10 nm or less. The fine fibrous cellulose is, for example, single-filament cellulose.

[0019] The fiber width of fine fibrous cellulose is measured, for example, using an electron microscope as follows. First, an aqueous suspension of fine fibrous cellulose with a concentration of 0.05% by mass or more and 0.1% by mass or less is prepared, and this suspension is cast onto a hydrophilically treated carbon film-coated grid to prepare a sample for TEM observation. When wide fibers are included, an SEM image of the surface cast onto glass may be observed. Next, electron microscope images are observed at magnifications of 1000x, 5000x, 10000x, or 50000x, depending on the width of the fibers to be observed. However, the sample, observation conditions, and magnification are adjusted to satisfy the following conditions.

[0020] (1) Draw a line X at any point in the observed image, and 20 or more fibers intersect with the line X. (2) Draw a line Y that intersects the line perpendicularly within the same image, and 20 or more fibers intersect the line Y.

[0021] For observation images that satisfy the above conditions, the widths of the fibers that intersect with the lines X and Y are visually read. In this way, three or more sets of observation images of at least the surface portions that do not overlap each other are obtained. Next, for each image, the widths of the fibers that intersect with the lines X and Y are read. In this way, the widths of at least 20 fibers x 2 x 3 = 120 fibers are read. The largest of these fiber widths is taken as the maximum fiber width. Then, the average value of the read fiber widths is used to calculate the fine fiber shape. It is the number average fiber width of cellulose.

[0022] The fiber length of the fine fibrous cellulose is not particularly limited, but is preferably, for example, 0.1 μm to 1000 μm, more preferably 0.1 μm to 800 μm, and even more preferably 0.1 μm to 600 μm. By keeping the fiber length within the above range, destruction of the crystalline regions of the fine fibrous cellulose can be suppressed. The fiber length of the fine fibrous cellulose can be determined, for example, by image analysis using TEM, SEM, or AFM.

[0023] The fine fibrous cellulose preferably has a type I crystal structure. The presence of type I crystal structure in fine fibrous cellulose can be identified by a diffraction profile obtained from a wide-angle X-ray diffraction photograph using CuKα (λ=1.5418 Å) monochromated with graphite. Specifically, it can be identified by the presence of typical peaks at two positions: 2θ=14° to 17° and 2θ=22° to 23°. The proportion of type I crystal structure in the fine fibrous cellulose is, for example, preferably 30% or more, more preferably 40% or more, and even more preferably 50% or more. The degree of crystallinity can be determined by measuring the X-ray diffraction profile and using the pattern in a conventional manner (Seagal et al., Textile Research Journal, Vol. 29, p. 786, 1959).

[0024] The axial ratio (fiber length / fiber width) of the fine fibrous cellulose is not particularly limited, but is preferably, for example, from 50 to 10,000, and more preferably from 100 to 1,000. By setting the axial ratio to the above lower limit or more, a composite material containing the fine fibrous cellulose can be easily formed. By setting the axial ratio to the above upper limit or less, it is preferable in that, for example, when the fine fibrous cellulose is used as a dispersion, handling such as dilution becomes easier.

[0025] The fine fibrous cellulose in this embodiment has, for example, both crystalline regions and amorphous regions.

[0026] Examples of modifications include oxidation, etherification, esterification, silane coupling, fluorination, and cationization. Esterification refers to a condensation reaction between an organic or inorganic oxo acid and a hydroxy group of cellulose. Specifically, it is a reaction that produces carboxylic acid esters, thioesters, phosphate esters, sulfate esters, nitrate esters, carbonate esters, etc.

[0027] For defibration or beating, for example, a wet atomization device, a high-speed defibrator, a grinder (stone mill type grinder), a high-pressure homogenizer or ultra-high-pressure homogenizer, a high-pressure collision type grinder, a ball mill, a bead mill, a disk type refiner, a conical refiner, a twin-screw kneader, a vibration mill, a homomixer under high-speed rotation, an ultrasonic disperser, or a beater can be used.

[0028] The concentration of the fibrous cellulose is preferably 0.1% by weight to 10% by weight, more preferably 0.5% by weight to 5.0% by weight, and particularly preferably 1.0% by weight to 2.5% by weight.

[0029] In this embodiment, the viscosity of the fibrous cellulose dispersion is 100,000 mPa·s or more. The viscosity of the fibrous cellulose dispersion is preferably 150,000 mPa·s or more, more preferably 160,000 mPa·s or more. It is also preferably 1,000,000 mPa·s or less, more preferably 700,000 mPa·s or less. The upper and lower limits of the above preferred values ​​can be arbitrarily combined, for example, 100,000 mPa·s or more to 1,000,000 mPa·s or less, or 150,000 mPa·s or more to 700,000 mPa·s or less. Pa·s or less, and 160,000 mPa·s to 700,000 mPa·s. The viscosity of the fibrous cellulose dispersion can be measured by the following method. The fibrous cellulose dispersion is left to stand at 23°C for 24 hours, then stirred and degassed using a planetary centrifugal mixer, and rotated at 3 rpm for 3 minutes at 23°C using a Brookfield viscometer to measure the viscosity.

[0030] 1 will be described as an example of a liquid delivery system according to this embodiment. Note that the configuration of the following embodiment is an example, and the present invention is not limited to the configuration of this embodiment.

[0031] <Initial liquid delivery unit> The liquid delivery system 10 of this embodiment comprises an initial liquid delivery unit including a tank 1 that can be filled with a fibrous cellulose dispersion, a pipe 2, and a pump 3 that enables the fibrous cellulose dispersion filled in the tank 1 to be delivered to the pipe 2.

[0032] The tank 1 is not limited to the embodiment shown in the figure, and any shape, capacity, and material may be used as long as it has an internal space that can be filled with a fibrous cellulose dispersion.

[0033] The pump 3 communicates with the internal space of the tank 1 and sends the fibrous cellulose dispersion liquid filled in the tank 1 to the pipe 2. The pump 3 is preferably attached below the tank 1. In FIG. 1, a connecting pipe 4 is provided between the tank 1 and the pump 3, but the tank 1 and the pump 3 may be directly connected without the connecting pipe 4. The length of the connecting pipe 4 is not particularly limited and is usually more than 0 m and less than 1 m.

[0034] The pump 3 is not particularly limited as long as it can pump a fibrous cellulose dispersion having a viscosity of 100,000 mPa s or more. The pump 3 is preferably a screw pump, more preferably a mono pump or a positive displacement twin-screw pump, and particularly preferably a positive displacement twin-screw pump.

[0035] A mono pump is a pump that transfers fluid by continuously moving the space created between the rotor and stator as a metal rotor with a single-start screw structure rotates inside a stator with a double-start screw structure. A positive displacement twin-screw pump is a pump that transfers fluid trapped in the space formed by two screws and a casing in the axial direction of the screws by rotating the screws.

[0036] It is preferable that the pump 3 is capable of pumping liquid so that the pressure (gauge pressure) on the discharge side of the pump 3 is 0.8 MPaG or less. There is no particular lower limit, but an example is 0.01 MPaG or more. That is, the pressure on the discharge side of the pump 3 may be 0.01 MPaG or more and 0.8 MPaG or less. When the pressure on the discharge side of the pump 3 is in this range, it is possible to prevent the pressure, heat, and other loads around the pump 3 from becoming excessive. The pressure at the discharge side of the pump 3 can be measured by a pressure gauge provided in-line at the discharge port of the pump.

[0037] The pipe 2 is attached downstream of the pump 3 and further transfers the fibrous cellulose dispersion liquid transferred by the pump 3 to a relay tank 5 . The inner diameter of the pipe 2 is preferably 10 mm to 100 mm, more preferably 20 mm to 95 mm, even more preferably 30 mm to 90 mm, particularly preferably 50 mm to 90 mm, and most preferably 80 mm to 90 mm. For example, a diameter of 3.5S (inner diameter 85.1 mm) can be used.

[0038] The length of the pipe 2 is the liquid transport distance between the pump 3 and the relay tank 5, and is a length that allows the speed of the fibrous cellulose dispersion discharged from the pipe 2 to be 10 L / min or more. If the speed of the fibrous cellulose dispersion is less than 10 L / min, the time required for liquid transport becomes excessive. There is no particular lower limit to the length of the pipe 2, and it can be, for example, more than 0 m. When the viscosity of the fibrous cellulose dispersion is μ (mPa·s), it is preferable that the length L of the pipe 2 satisfies the following formula: L<-99.32ln(μ)+1322.1

[0039] <Relay liquid transfer unit> The liquid delivery system 10 of this embodiment includes at least one relay liquid delivery unit including a relay tank 5 that can be filled with a fibrous cellulose dispersion, a relay pipe 6, and a relay pump 7 that can deliver the fibrous cellulose dispersion filled in the relay tank 5 to the relay pipe 6. By using the relay liquid delivery unit, the load around the pump 3 of the initial liquid delivery unit can be reduced.

[0040] The relay tank 5 is not limited to the embodiment shown in the drawing, and any shape, capacity, and material may be used as long as it has an internal space large enough to be filled with a fibrous cellulose dispersion. The capacity of the relay tank 5 is preferably smaller than that of the tank 1.

[0041] The relay pump 7 communicates with the internal space of the relay tank 5 and sends the fibrous cellulose dispersion filled in the relay tank 5 to the relay piping 6. The relay pump 7 is preferably attached below the relay tank 5. In FIG. 1 , a connecting piping 8 is provided between the relay tank 5 and the relay pump 7, but the relay tank 5 and the relay pump 7 may be directly connected without the connecting piping 8. The length of the connecting piping 8 is not particularly limited and is usually more than 0 m and less than 1 m.

[0042] The relay pump 7 is not particularly limited as long as it can pump a fibrous cellulose dispersion having a viscosity of 100,000 mPa·s or more. The relay pump 7 is preferably a screw pump, and more preferably a mono pump or a positive displacement twin screw pump.

[0043] It is preferable that the relay pump 7 is capable of pumping liquid so that the pressure (gauge pressure) on the discharge side of the relay pump 7 is 0.8 MPaG or less. There is no particular limitation on the lower limit, but an example is 0.01 MPaG or more. In other words, the pressure on the discharge side of the relay pump 7 may be 0.01 MPaG or more and 0.8 MPaG or less. If the pressure on the discharge side of the relay pump 7 is within this range, it is possible to prevent the pressure, heat, and other loads around the relay pump 7 from becoming excessive.

[0044] The relay pipe 6 is attached downstream of the relay pump 7, and further transfers the fibrous cellulose dispersion transferred by the relay pump 7 downstream. When another relay liquid transfer unit is present downstream of the relay pipe 6, the relay pipe 6 transfers the fibrous cellulose dispersion to the relay tank of the other relay liquid transfer unit. The inner diameter of the relay pipe 6 is preferably 10 mm to 100 mm, more preferably 20 mm to 95 mm, even more preferably 30 mm to 90 mm, particularly preferably 50 mm to 90 mm, and most preferably 80 mm to 90 mm. For example, a 3.5S (inner diameter 85.1 mm) can be used.

[0045] The length of the relay pipe 6 is the liquid transport distance between the relay pump 7 and the discharge port of the relay pipe 6, and is the length at which the speed of the fibrous cellulose dispersion discharged from the relay pipe 6 is 10 L / min or more. If the flow rate of the fibrous cellulose dispersion is less than 10 L / min, the time required for sending the liquid may become excessive. There is no particular lower limit to the length of the relay pipe 6, and it may be, for example, more than 0 m. When the viscosity of the fibrous cellulose dispersion is μ (mPa·s), it is preferable that the length L of the relay pipe 6 satisfies the following formula: L<-99.32ln(μ)+1322.1

[0046] The liquid delivery system of this embodiment includes at least one relay liquid delivery unit, and may include two or more. Two or more relay liquid delivery units are usually arranged in series. When the liquid delivery system of this embodiment includes two or more relay liquid delivery units, the relay tanks, relay piping, and relay pumps of these relay liquid delivery units may be the same or different as long as they satisfy the above conditions.

[0047] The total length of the piping 2 and the relay piping 6 is 10 m or more. It may also be 50 m or more or 100 m or more. There is no particular upper limit, but an example is 1000 m or less. When the liquid delivery system of this embodiment has two or more relay liquid delivery units, the total length of the relay piping provided in those relay liquid delivery units and the piping provided in the initial liquid delivery unit may be within the above range.

[0048] <Method of producing a fibrous cellulose-containing composition> The fibrous cellulose dispersion delivered by the delivery method according to one embodiment of the present invention can be used for the production of various fibrous cellulose-containing compositions, etc. That is, yet another embodiment of the present invention is a method for producing a fibrous cellulose-containing composition, which includes a step of delivering a fibrous cellulose dispersion by the delivery method according to one embodiment of the present invention.

[0049] For example, when the fibrous cellulose-containing composition contains fine fibrous cellulose, the production method may include a defibration step in which the fibrous cellulose contained in the fibrous cellulose dispersion is defibrated to obtain a fine fibrous cellulose dispersion. Defibration is also called micronization. In the defibration step, for example, a defibration treatment device can be used. The defibration treatment device is not particularly limited, but examples that can be used include a high-speed defibrator, a grinder (stone mill), a high-pressure homogenizer, an ultra-high-pressure homogenizer, a high-pressure collision grinder, a ball mill, a bead mill, a disk refiner, a conical refiner, a twin-screw kneader, a vibration mill, a homomixer under high-speed rotation, an ultrasonic disperser, or a beater. Among the above-mentioned defibration treatment devices, it is more preferable to use a high-speed defibrator, a high-pressure homogenizer, or an ultra-high-pressure homogenizer, which are less affected by the grinding media and have less risk of contamination.

[0050] The step of feeding the fibrous cellulose dispersion liquid can be carried out, for example, before or after the defibration treatment step. [Example]

[0051] The features of the present invention will be explained in more detail below with reference to examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the specific examples shown below.

[0052] A fine fibrous cellulose (CNF) dispersion was pumped under the following conditions. The pump length was increased until the speed of the fine fibrous cellulose dispersion discharged from the piping fell below 10 L / min. The length is shown in Table 1. Pipe diameter: 3.5S (inner diameter 85.1mm) Pump: positive displacement twin screw pump Pressure: 0.8 MPaG or less Fine fibrous cellulose dispersion: The aqueous pulp dispersion was introduced into a high-pressure homogenizer and defibrated to obtain a fine fibrous cellulose dispersion.

[0053] [Table 1]

[0054] When Examples 1 to 3 are plotted with viscosity μ on the horizontal axis and maximum length L on the vertical axis, and these plots are logarithmically approximated by the least squares method, the following equation is obtained: R 2 The value is 0.9994. L=-99.32ln(μ)+1322.1

[0055] From the above results, it can be seen that when a highly viscous and poorly fluid liquid is to be transported over a long distance of 10 m or more, it is sufficient to install an initial liquid transport unit and a relay liquid transport unit so that the length of the piping and relay piping is less than the above maximum length L. [Explanation of symbols]

[0056] 10 Liquid Delivery System 1 tank 2 Piping 3. Pump 4 Connecting piping 5. Relay Tank 6 Relay piping 7 Relay Pump 8 Connecting piping

Claims

1. a tank capable of being filled with a fibrous cellulose dispersion; Piping and an initial liquid-transporting unit including a pump that can transport the fibrous cellulose dispersion filled in the tank to the piping; and a relay tank capable of filling the fibrous cellulose dispersion discharged from the piping; and Relay piping; at least one relay liquid-transporting unit including a relay pump that enables the fibrous cellulose dispersion filled in the relay tank to be transported to the relay pipe, The viscosity of the fibrous cellulose dispersion is 100,000 mPa s or more, The total length of the piping and the relay piping is 10 m or more, the length of the pipe is such that the speed of the fibrous cellulose dispersion discharged from the pipe is 10 L / min or more, A liquid delivery system, wherein the length of the relay pipe is such that the speed of the fibrous cellulose dispersion discharged from the relay pipe is 10 L / min or more.

2. 2. The liquid delivery system according to claim 1, wherein when the viscosity of the fibrous cellulose dispersion is μ (mPa·s), the lengths L of the pipe and the relay pipe each satisfy the following formula: L<-99.32ln(μ)+1322.1

3. 3. The liquid delivery system according to claim 1, wherein the pump and the relay pump are each independently a mono pump or a positive displacement twin screw pump.

4. 3. The liquid delivery system according to claim 1, wherein the pump and the relay pump are capable of delivering liquid such that the pressure on the discharge side of the pump and the relay pump is 0.8 MPaG or less.

5. 3. The liquid transfer system according to claim 1, wherein the inner diameter of each of the pipe and the relay pipe is 100 mm or less.

6. The liquid transfer system according to claim 1 or 2, wherein the relay tank has a smaller capacity than the tank.

7. A method for delivering a fibrous cellulose dispersion, comprising: sending the fibrous cellulose dispersion filled in a tank to a pipe using a pump; filling the fibrous cellulose dispersion discharged from the piping into a relay tank; and sending the fibrous cellulose dispersion filled in the relay tank to a relay pipe by a relay pump, The viscosity of the fibrous cellulose dispersion is 100,000 mPa s or more, The total length of the piping and the relay piping is 10 m or more, the length of the pipe is such that the speed of the fibrous cellulose dispersion discharged from the pipe is 10 L / min or more, The method, wherein the length of the relay pipe is such that the speed of the fibrous cellulose dispersion discharged from the relay pipe is 10 L / min or more.

8. The method according to claim 7 , wherein the length L of the pipe and the relay pipe respectively satisfies the following formula when the viscosity of the fibrous cellulose dispersion is μ (mPa·s): L<-99.32ln(μ)+1322.1

9. 9. The method of claim 7 or 8, wherein the pump and the relay pump are each independently a mono pump or a positive displacement twin screw pump.

10. The method according to claim 7 or 8, wherein the pressure on the discharge sides of the pump and the relay pump when the fibrous cellulose dispersion is pumped by the pump and the relay pump is 0.8 MPaG or less.

11. The method according to claim 7 or 8, wherein the inner diameter of the pipe and the relay pipe is 100 mm or less.

12. 9. The method according to claim 7 or 8, wherein the capacity of the relay tank is smaller than the capacity of the tank.

13. A method for producing a fibrous cellulose-containing composition, comprising a step of delivering a fibrous cellulose dispersion by the method according to claim 7 or 8.

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