JP2002201302A - Modified product of wood tar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effectively utilizable, modified product of a wood tar. SOLUTION: The wood tar is heated and foamed to provide a porous structure. The modified product of the wood tar is obtained by heating the wood tar to foam the wood tar, and the foamed product has a composition resembled to that of a charcoal and nearly composed of carbon, and the structure is a porous structure to provide excellent adsorptivity (hydroscopicity) and heat insulation. The modified product can be heated and formed so as to provide a desired shape. As a result, the wood tar can be effectively utilized as same as charcoal, e.g. by heating and forming the wood tar into a wall material, a humidity-controlling material, a flooring material or the like. The foamed product has a light weight, can be freely formed, and can be used by forming the wood tar into a powdery body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modified wood tar which can be effectively used.

[0002]

2. Description of the Prior Art Pyrolysis of woody components yields charcoal, wood vinegar, wood tar and the like. Among them, charcoal and wood vinegar have various uses at present.

However, wood tar is hardly used except for special uses such as the use of wood creosote obtained by distilling and refining wood tar, and is incinerated as unnecessary residue. In many cases, they were looking for ways to use them effectively.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a modified wood tar which can be effectively used.

[0005]

In order to solve the above-mentioned problems, the present invention employs the following technical means. The modified wood tar is characterized in that the wood tar is heated and foamed to have a porous structure.

In this modified wood tar, the wood tar is foamed by heating, and the composition of the foam is similar to the composition of charcoal and is mostly composed of carbon, but its structure is porous (porous). And is excellent in adsorptivity (such as moisture absorption) and heat insulation.

[0007] As described above, it has a porous structure and has high adsorptivity (hygroscopicity, etc.) and other characteristics, and can be suitably used as, for example, a soil improvement material, a water purification material, a deodorant, and a repellent. Can also be suitably used. Further, since it has a high carbon content, it can be suitably used as a carbon fiber raw material as a substitute for coke and the like, and similarly can be suitably used as a biomass energy fuel as a substitute for coal and petroleum resources. Heat molding may be performed to obtain a desired shape.

[0008] With this configuration, for example, it can be formed into a shape such as a wall material, a humidity control material, or a material under the floor, and can be effectively used similarly to charcoal. It is light and freely moldable, and can be used after being molded into powder or the like. The foam may be fired.

When the foam is baked in this manner, the arrangement of elements changes to produce a carbon-based material having a higher density. Therefore, the foam can be used as an electromagnetic wave shielding material. This wood tar metamorphic product is made of a natural material called wood as a raw material, is very preferable for environmental protection, and can be widely used as an eco-material.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

First, wood tar was obtained as follows. That is, as shown in FIG. 1, wood was carbonized in a kiln at about 1000 ° C., and the resulting smoke was liquefied and cooled to obtain a raw material tar. This raw material tar was distilled under reduced pressure, and the crude wood vinegar was removed to obtain a wood tar (settled tar). The wood tar was placed in a kettle, heated at about 300 ° C. for about 4 hours to form a plate or an appropriate shape, and foamed to obtain a modified wood tar of a porous structure.

This foam is in the form of a wafer, and is mostly composed of carbon. That is, as a result of performing an elemental analysis of the wood tar modified product, carbon was 80.57%, hydrogen was 4.64%,
Nitrogen was 1.48% and was found to have a high carbon content. An electron micrograph (photographing conditions: 40 times) of this wood tar metamorphic product was taken. FIG. 2 is a drawing of the electron micrograph. In this micrograph, several cavities 1 are shown, and it can be clearly grasped that it has a porous structure.

[0013] By the way, when wood tar is distilled under reduced pressure, the black viscous substance which remains in the kettle without being distilled is wood pitch, which is obtained by removing wood tar oil from wood tar. The modified product was obtained.

Further, the foam was calcined at about 1500 ° C. or higher to obtain a modified wood tar.

Next, the state of use of the modified wood tar of this embodiment will be described.

In this modified wood tar, the wood tar is foamed by heating, and the composition of the foam is similar to the composition of charcoal and is mostly composed of carbon, but its structure is a porous structure. It is excellent in adsorptivity (hygroscopicity etc.) and heat insulation, and has the advantage that it can be used effectively by taking advantage of this property.

In addition, foaming can be performed, and various moldings can be performed depending on conditions. When the composition is heated and formed into a desired shape and then foamed, for example, the material is formed into a shape such as a wall material, a humidity control material, and a floor material by heating. Therefore, there is an advantage that effective utilization can be achieved similarly to charcoal.

Further, the foam is heated to a high temperature (for example, 150
When calcined at about 0 ° C. or higher), the arrangement of elements changes and the carbon-based material becomes denser. Therefore, there is an advantage that the carbon-based material can be used as an electromagnetic wave shielding material or the like by utilizing its high conductivity. .

[0019]

The present invention is configured as described above and has the following effects.

This foam is excellent in adsorptive properties and heat insulating properties, and can provide a modified wood tar which can be effectively used by taking advantage of these properties.

Further, when the material is converted into a carbon-based material by firing, this property can be utilized to achieve more effective use.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method for producing wood tar of the present invention.

FIG. 2 is a drawing of an electron micrograph of the obtained wood tar modified product.

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Claims (3)

[Claims] 1. A modified wood tar, wherein the wood tar is heated and foamed to have a porous structure. 2. The modified wood tar product according to claim 1, which is formed by heating to a desired shape. 3. The modified wood tar product according to claim 1, wherein the foamed product is fired.