JP2006306649A - Device for recovering sugar carbonized material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a device for recovering a sugar carbonized material from an acid sugar solution without using a special pump such as a mohnopump. <P>SOLUTION: The device 10 for recovering a sugar carbonized material where, from an acid sugar solution obtained by subjecting a cellulose component comprised in a woody material to hydrolysis with an acid, a sugar component dissolved in the acid sugar solution is carbonized, so as to recover a sugar carbonized material is provided with: a storage tank 12 of storing the acid sugar solution; a heating apparatus 14 of heating the acid sugar solution; a pressure-feeding pump 18 of pressure-feeding the acid sugar solution from the storage tank 12 toward the heating apparatus 14; and a solid-liquid separation apparatus 16 of separating a sugar carbonized material produced in the acid sugar solution heated by the heating apparatus 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for recovering sugar carbide by carbonizing a sugar component dissolved in an acid sugar liquid from an acid sugar liquid obtained by hydrolyzing a cellulose component contained in a woody material with an acid. .

  Woody materials such as wood and kenaf contain lignin, hemicellulose, and hemicellulose as their constituent components. From the viewpoint of effective use of plant resources, an attempt to separate and recover these components Has been made so far. For example, in Patent Documents 1 and 2, cresol and acid (for example, sulfuric acid) are sequentially added to a wood-based material containing lignin, hemicellulose, and cellulose, and the phase separation phenomenon of cresol and acid is used. The lignin component is recovered from the cresol phase on the upper phase side, and an acid sugar solution (mainly, sugars such as glucose formed by hydrolysis of the cellulose component by acid are dissolved from the acid phase on the lower phase side. The technique which can collect | recover the liquid which is) is disclosed. According to this technique, the lignin component can be separated and recovered from the woody material. The recovered lignin component can be processed into an adhesive or a film, or can be effectively used as a binder for solidifying pulp collected from waste paper to form a molded body.

  In the conventional technology described above, the lignin component can be recovered from the wood-based material for effective use. However, it is difficult to say that the other component contained in the wood-based material, that is, the effective use of the cellulose component has been sufficiently achieved. Therefore, in order to more effectively use the cellulose component contained in the woody material, the sugar component dissolved in the acid sugar solution is carbonized from the acid sugar solution obtained by hydrolyzing the cellulose component with an acid. An apparatus as shown in FIG. 2 for recovering sugar carbide has been proposed.

  FIG. 2 shows an example of an apparatus for recovering sugar carbide from an acid sugar solution. As shown in FIG. 2, the sugar carbide recovery device 100 includes a storage tank 110 that stores an acid sugar solution obtained by hydrolyzing a cellulose component contained in a wood-based material with an acid, and the storage. A heating device 112 that heats the acid sugar solution stored in the tank 110 is provided. When the acid sugar solution is heated by the heating device 112, the sugar component dissolved in the acid sugar solution is carbonized to precipitate sugar carbide. The acid sugar liquid containing sugar carbide is a slurry of solid-liquid mixing, and the acid sugar liquid in the slurry is pumped by the pump 114 and sent to the solid-liquid separator 116. As the pump 114, a special pump (for example, a Mono pump) for slurry pressure feeding is used. For the solid-liquid separation device 116, for example, a compression-type solid-liquid separation device such as a filter press is used. The storage tank 110 is made of a special material that can withstand the corrosion caused by the heated acid sugar solution, for example, a special metal such as Hastelloy. In addition, an agitator 118 for diffusing sugar carbide precipitated in the heated acid sugar liquid into the liquid is installed at the upper part of the storage tank 110.

Japanese Patent No. 2895087 JP 2001-64494 A

  By the way, according to the sugar carbide recovery apparatus 100 shown in FIG. 2, since the acid sugar liquid fed from the storage tank 110 to the solid-liquid separation device 116 is a slurry, a pump for pumping this acid sugar liquid As 114, a special pump such as a MONO pump must be used. This MONO pump rotates a metal stator formed in a spiral inside a resin rotor, and by utilizing the volume change between the rotor and the stator caused by the eccentric rotation of the stator, It is a pump capable of quantitatively feeding even a transported material mixed with a solid such as an acid sugar solution without causing pulsation.

However, since the MONO pump requires special technology, it is not only expensive to manufacture, but also maintenance work is not easy. In addition, when a corrosive slurry such as an acid sugar solution is pumped, a special and expensive metal such as titanium or hastelloy must be employed as the stator material in order to suppress the wear and corrosion of the stator.
Then, this invention makes it a subject to provide the apparatus which collect | recovers sugar carbide from an acid sugar liquid which does not need to use special pumps, such as a Mono pump.

Means for solving the above problems are the inventions described in the following (1) to (7).
(1) An apparatus for recovering sugar carbide by carbonizing a sugar component dissolved in an acid sugar solution from an acid sugar solution obtained by hydrolyzing a cellulose component contained in a woody material with an acid. Storing means for storing the acid sugar liquid, heating means for heating the acid sugar liquid, pressure feeding means for pumping the acid sugar liquid from the storage means toward the heating means, and the heating means And a separation means for separating the sugar carbide produced in the acid sugar liquid heated by the method.
(2) The sugar carbide recovery apparatus according to (1), wherein a pipe connecting the heating unit and the separation unit is connected to an upper portion of the heating unit, and the inside of the heating unit An apparatus for recovering sugar carbide, comprising a feeding means for feeding the produced sugar carbide to the separation means.
(3) The sugar carbide recovery apparatus according to (1) or (2), wherein the pumping means is a diaphragm pump.
(4) The sugar carbide recovery device according to any one of (1) to (3), wherein the heating means is a tubular vertical heating furnace. apparatus.
(5) The sugar carbide recovery device according to any one of (1) to (4), wherein the heating means includes a ceramic tube and a heater disposed around the ceramic tube. An apparatus for recovering sugar carbide is characterized by the above.
(6) The sugar carbide recovery device according to any one of (1) to (5), wherein a pipe for feeding the cleaning liquid is connected to a pipe connecting the heating means and the separation means. An apparatus for recovering sugar carbide, characterized in that
(7) The sugar carbide recovery apparatus according to (6), wherein an in-line mixer is installed in a pipe connecting the heating unit and the separation unit. Recovery equipment.

  According to the present invention, it is possible to construct an apparatus for recovering sugar carbide from acid sugar liquid without using a special pump such as a Mono pump.

  The present invention relates to an apparatus for recovering sugar carbide by carbonizing a sugar component dissolved in an acid sugar liquid from an acid sugar liquid obtained by hydrolyzing a cellulose component contained in a woody material with an acid. Is. More specifically, for example, from the sulfated sugar solution obtained by hydrolyzing the cellulose component contained in the wood-based material with sulfuric acid, the sugar component dissolved in the sulfated sugar solution is carbonized to produce sugar carbide. It is related with the apparatus to collect | recover. The acid used for the hydrolysis may be any acid such as sulfuric acid, phosphoric acid, nitric acid, etc. Among them, sulfuric acid is preferable. Among these, it is also possible to use a mixture of two or more acids. For example, phosphoric acid and sulfuric acid can be mixed and used. A sugar solution obtained by hydrolyzing the cellulose component with an acid is called an acid sugar solution. A sugar solution obtained by hydrolyzing the cellulose component with sulfuric acid is called a sulfated sugar solution. The acid sugar solution or sulfate sugar solution may contain other components other than the acid and sugar components.

  The “woody material” in the present invention is a lignocellulosic material containing lignin, hemicellulose, and cellulose. The word “wood” is attached to the name, but it is not limited to wood and can be collected from herbs. Such wood-based materials can be collected from various trees such as cedar, cypress and beech. It can also be collected from herbs such as kenaf stalk, corn, sugarcane, hemp, rush and rice. Alternatively, it can be collected from industrial waste such as house demolition, furniture demolition, wood chips, thinned wood, rice husk, wood flour, waste paper, pruned branches, cut grass, fallen leaves, and sugarcane pressed bagasse. .

By adding and mixing a phenol derivative and an acid with respect to a wooden material, the lignocellulosic substance contained in the wooden material can be isolate | separated into a lignin component and a cellulose component (cellulose, hemicellulose). As the phenol derivative, for example, cresol can be used. As the acid, for example, sulfuric acid can be used.
When an acid is added to a woody material, the cellulose component contained in the woody material swells and further undergoes partial hydrolysis and dissolution, with the result that the cell wall structure is destroyed. When the reaction between the cellulose component and the acid further proceeds, the cellulose component is decomposed into saccharides (carbohydrates) such as glucose and dissolved in the acid. An acid in which a saccharide obtained by hydrolysis of a cellulose component is dissolved is called an “acid sugar solution”. The acid sugar liquid recovery apparatus 10 according to the present invention is an apparatus for recovering sugar carbide by carbonizing a saccharide dissolved in the acid sugar liquid.

FIG. 1 shows the configuration of a sugar carbide recovery device 10 according to the present invention.
As shown in FIG. 1, the sugar carbide recovery device 10 separates the sugar carbide from the acid sugar liquid, a storage tank 12 for storing the acid sugar liquid, a heating device 14 for heating the acid sugar liquid. And a solid-liquid separation device 16. The storage tank 12 is connected to the heating device 14 via a pipe 30. In the middle of the pipe 30, a pumping pump 18 that pumps the acid sugar liquid stored in the storage tank 12 to the heating device 14 is installed. An air chamber 20 is installed on the downstream side of the pressure pump 18 to absorb the pulsation of the transferred product accompanying the operation of the pressure pump 18.

  The storage tank 12 is a tank for storing an acid sugar solution obtained by hydrolyzing a cellulose component contained in a wood-based material with an acid. The storage tank 12 corresponds to the “storage unit” in the present invention. As a material of the tank body 12a of the storage tank 12, in order to prevent corrosion from the acid sugar solution stored inside, a corrosion-resistant metal material such as stainless steel or a resin material such as FRP is used. The However, since the storage tank 12 does not store the heated acid sugar solution, it is not necessary to use a special metal material (for example, Hastelloy) that can withstand hot concentrated sulfuric acid, for example. Moreover, in this storage tank 12, since the acid sugar liquid has not yet been heated, and sugar carbide is not deposited in the acid sugar liquid, a stirrer for diffusing the sugar carbide in the liquid is provided. There is no need to install.

  The heating device 14 is a device for heating the acid sugar liquid that has been pumped from the storage tank 12 by the pumping pump 18. The heating device 14 corresponds to the “heating means” in the present invention. The heating device 14 is configured as a tubular vertical furnace. That is, the heating device 14 includes a circular ceramic tube 14a and a heater 14b disposed around the ceramic tube 14a. When the ceramic tube 14a is heated by the heater 14b, the acid sugar solution flowing inside the ceramic tube 14a is heated. As a material of the ceramic tube 14a, a heat-resistant ceramic material such as alumina or silica is used. As the heater 14b, for example, an electrothermal heater composed of nichrome wire is used.

  As shown in FIG. 1, in the heating device 14, a ceramic tube 14a is installed vertically, and a pipe 30 is connected to the lower portion of the ceramic tube 14a. Then, the acid sugar solution fed by the pressure pump 18 flows in from the lower part and flows upward in the ceramic tube 14a installed vertically. The heating temperature of the acid sugar solution by the heating device 14 is controlled so that the temperature of the acid sugar solution at the outlet 14c of the ceramic tube 14a is, for example, 60 ° C. or higher and 100 ° C. or lower (more preferably 70 ° C. or higher and 90 ° C. or lower). The

  When the acid sugar liquid is heated by the heating device 14, a sugar component (monosaccharide such as glucose) dissolved in the acid sugar liquid is carbonized and a sugar carbide is precipitated. Since the sugar carbide encloses the gas generated when the acid sugar liquid is heated, it floats upward in the ceramic tube 14a. In addition, when sulfuric acid is used as the acid added to the wood-based material, because the specific gravity of sulfuric acid is high, sugar carbide floats inside the ceramic tube 14a. In the present invention, the sugar carbide is thus actively floated inside the ceramic tube 14a. Accordingly, the acid sugar liquid and sugar carbide are allowed to flow quickly upward in the ceramic tube 14a installed vertically. Further, since the ceramic tube 14a is installed vertically, the contact efficiency with the acid sugar solution flowing in the tube is high, and the acid sugar solution can be efficiently heated.

The pressure pump 18 is a pump for pumping the acid sugar solution stored in the storage tank 12 to the heating device 14. This pressure feed pump 18 corresponds to the “pressure feed means” in the present invention.
The pump 18 is a pump for pumping the acid sugar solution toward the heating device 14. In the present embodiment, a diaphragm pump can be used as the pumping pump 18. This is because the acid sugar liquid is not heated by the heating device 14 and no sugar carbide is precipitated in the acid sugar liquid, so that a special pump for pumping the solid-liquid mixed slurry as the pressure pump 18 is used. This is because it is not necessary to use a simple pump (for example, a Mono pump).

As the pumping pump 18 for pumping the acid sugar solution, a diaphragm pump can be used. This is because the acid sugar liquid does not contain solids such as sugar carbides, so that even when a diaphragm pump is used, no solid is caught between the suction valve 18a and the discharge valve 18b in the pump.
When a diaphragm pump is used as the pumping pump 18, the manufacturing cost is extremely low compared with, for example, a case where a mono pump is used. In addition, since the diaphragm pump is more versatile than the Mono pump, it is easy to procure parts such as consumables, and the maintenance cost can be reduced. When a diaphragm pump is used, rubber, PTFE (polytetrafluoroethylene), or the like can be used as the material of the diaphragm (diaphragm).
Further, when a diaphragm pump is used as the pressure pump 18, it is normal that pulsation is generated in the transferred material as the diaphragm (diaphragm) reciprocates. In this embodiment, the air chamber 20 is provided in the middle of the pipe 30. Is installed, so that the pulsation of such a transported material is absorbed.

  The heating device 14 and the solid-liquid separation device 16 are connected by a pipe 32. The pipe 32 is connected to the upper part of the heating device 14. When the acid sugar solution is heated by the heating device 14, sugar carbide is generated inside the ceramic tube 14 a constituting the heating device 14. The produced sugar carbide is sent to the solid-liquid separator 16 through the pipe 32. In the present invention, the pressure pump 18 can be used as a feeding means for feeding the sugar carbide into the solid-liquid separator 16. That is, the sugar carbide generated inside the heating device 14 can be fed into the solid-liquid separation device 16 by the pressure generated by the operation of the pressure pump 18. In addition, as the feeding means for feeding the sugar carbide, for example, the negative pressure when the water stored in the water storage tank 24 flows inside the pipe 32 is used, or the solid-liquid separation device 16 is used. For example, a suction device may be provided.

  Further, a pipe 34 for feeding water as a cleaning liquid stored in the water storage tank 24 is connected in the middle of the pipe 32 connecting the heating device 14 and the solid-liquid separation device 16. An in-line mixer 22 for stirring water, sugar carbide, and acid sugar liquid flowing in the pipe 32 is provided in the pipe 32 that connects the heating device 14 and the solid-liquid separator 16. The in-line mixer 22 is a static mixer installed inside the pipe 32 and is also called a static mixer. The in-line mixer 22 is formed of a resin such as polypropylene or a metal such as stainless steel. The shape of the in-line mixer 22 is not particularly limited, but for example, a spiral blade shape can be adopted.

  The sugar carbide recovery device 10 includes a water storage tank 24 for storing water. The water storage tank 24 is connected to a pipe 32 that connects the heating device 14 and the solid-liquid separator 16 via a pipe 34. The pipe 34 is connected to the lower part of the water storage tank 24, and in the middle of the pipe 34, a pumping pump 26 for pumping the water stored in the water storage tank 24, and a transferred product accompanying the operation of the pumping pump 26. An air chamber 28 is installed to absorb the pulsation. In this embodiment, a diaphragm pump is used as the pressure pump 26.

  The water stored in the water storage tank 24 is pumped by the pumping pump 26 and fed into the inlet portion of the in-line mixer 22. At the inlet of the in-line mixer 22, the pipe 32 from the heating device 14 and the pipe 34 from the water storage tank 24 merge. The acid sugar liquid heated by the heating device 14 joins with water fed from the water storage tank 24 and is mixed and stirred by the in-line mixer 22. Moreover, the sugar carbide produced | generated inside the heating apparatus 14 is sent into the solid-liquid separator 16 with the water sent into the piping 32. FIG.

  When the acid sugar solution and water are mixed and stirred by the in-line mixer 22, the temperature of the acid sugar solution is lowered and the concentration of the acid sugar solution is lowered. This eliminates the need to use a special material (such as Hastelloy) that can withstand the hot concentrated acid as the material of the pipe 32. For example, as the material of the pipe 32, normal stainless steel such as SUS304 or SUS316L can be used.

The acid sugar liquid mixed and stirred with water by the in-line mixer 22 is sent to the solid-liquid separator 16. The solid-liquid separation device 16 is a device for separating a solid and a liquid, and for example, a squeeze type solid-liquid separation device such as a filter press can be employed. This solid-liquid separation device 16 corresponds to the “separation means” in the present invention.
The sugar carbide contained in the acid sugar liquid is separated and collected from the acid sugar liquid by the solid-liquid separator 16. This recovered sugar carbide can be used for various purposes. For example, sugar carbide recovered from an acid sugar solution can be used as a material for activated carbon, a raw material for fertilizer, and the like.
On the other hand, the acid sugar solution after the sugar carbide is separated and recovered is recovered in the recovery tank 17. When sulfuric acid is used as the acid added to the woody material, most of the acid sugar liquid recovered in the recovery tank 17 is dilute sulfuric acid because the sugar component is separated as sugar carbide. The dilute sulfuric acid recovered in the recovery tank 17 can be reused as sulfuric acid for obtaining an acid sugar solution by adding to the woody material after passing through necessary purification steps such as filtration and concentration.

As described above, in the sugar carbide recovery device 10 according to the present invention, the pumping pump 18 for pumping the acid sugar liquid is installed upstream of the heating device 14. Therefore, it is not necessary to use a special pump (such as a Mono pump) for pumping the solid-liquid mixed slurry as the pressure feeding pump 18, and a versatile pump such as a diaphragm pump can be used.
Further, the heating device 14 is composed of a ceramic tube 14a and a heater 14b disposed around the ceramic tube 14a. Since the ceramic tube 14a is installed vertically, the heating device is used as a batch tank or the like as in the prior art. There is an advantage that the whole apparatus becomes compact rather than comprising.
Moreover, since the heating apparatus 14 is comprised by the ceramic tube 14a and the heater 14b arrange | positioned around it, there exists the characteristic that the heating efficiency at the time of heating an acid sugar liquid is high. In this case, since there is little need to stir the acid sugar solution to increase the heating efficiency, there is an advantage that it is not necessary to install a stirrer or the like in the heating device as in the conventional case.

It is a figure which shows the structure of the collection | recovery apparatus of sugar carbide. It is a figure which shows the structure of the collection | recovery apparatus of the conventional sugar carbide.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sugar carbide collection | recovery apparatus 12 Storage tank 14 Heating apparatus 14a Ceramic pipe 14b Heater 16 Solid-liquid separation apparatus 17 Recovery tank 18 Pressure pump 20 Air chamber 22 Inline mixer 24 Water storage tank 30,32,34 Piping

Claims (7)

An apparatus for recovering sugar carbide by carbonizing a sugar component dissolved in the acid sugar liquid from an acid sugar liquid obtained by hydrolyzing the cellulose component contained in the woody material with an acid,
Storage means for storing the acid sugar solution;
Heating means for heating the acid sugar solution;
A pumping means for pumping the acid sugar solution from the storage means toward the heating means;
Separation means for separating sugar carbide produced in the acid sugar liquid heated by the heating means, and a sugar carbide recovery device. The sugar carbide recovery device according to claim 1,
A pipe connecting the heating means and the separating means is connected to the upper part of the heating means,
An apparatus for recovering sugar carbide, comprising a feeding means for feeding sugar carbide generated inside the heating means to the separation means. The sugar carbide recovery device according to claim 1 or 2, wherein
The sugar carbide recovery apparatus, wherein the pumping means is a diaphragm pump. The sugar carbide recovery device according to any one of claims 1 to 3,
The sugar carbide recovery apparatus, wherein the heating means is a tubular vertical heating furnace. The sugar carbide recovery device according to any one of claims 1 to 4, wherein
The sugar carbide recovery apparatus, wherein the heating means includes a ceramic tube and a heater disposed around the ceramic tube. The sugar carbide recovery device according to any one of claims 1 to 5,
A sugar carbide recovery apparatus, wherein a pipe for feeding a cleaning liquid is connected to a pipe connecting the heating means and the separation means. The sugar carbide recovery device according to claim 6,
An apparatus for recovering sugar carbide, wherein an in-line mixer is installed in a pipe connecting the heating means and the separation means.

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