JPS5899109A - Manufacture of molded activated carbon containing carboxymethylcellulose - Google Patents

Abstract

PURPOSE:To enhance the water resistance of molded activated carbon contg. CMC as a binder by drying the carbon by heating at a high temp. CONSTITUTION:To 100pts.wt. powdered activated carbon such as powdered carbon black are added 0.1-10pts.wt. CMC, preferably CMC with high viscosity such as about 1,300-1,500cps at 1% concn. and an adequate amount of water, and they are kneaded, press-molded under about 10-150kg/cm<2> pressure, and dried by heating at 150-200 deg.C for about 1-8hr.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing shaped activated carbon containing carboxymethyl cellulose (hereinafter abbreviated as CMC).

More specifically, the present invention relates to a method for manufacturing CMC-containing shaped activated carbon, which is characterized in that water-soluble CMC is rendered water-resistant by heating and drying shaped activated carbon containing CMC as a binder' at a high temperature.

Conventionally, since CMC is water-soluble, it could not be used as shaped activated carbon for liquid adsorption, which requires water resistance.

In addition, studies related to temporarily making CMC water resistant include Japanese Patent Publication No. 42-6674 and CM, which treat CMC with aldehyde as a method to prevent complication without temporarily dissolving it in water.
Special Publication in 1970 that heat-treated C at low temperature (60-130℃)
-29859, etc. However, these methods only temporarily make CMC water resistant. Therefore, the CMC obtained by these methods cannot be used at all as molded activated carbon for liquid adsorption, which requires sufficient water resistance.As a result of intensive studies, the present inventors have found that activated carbon CM Co, 1 to 10 per 100 parts by weight of powder
The activated carbon obtained by adding parts by weight and water and kneading and press-molding is heat-dried at 158 to 200°C for several hours to obtain C.
It was discovered that the water resistance of MC could be sufficiently improved, and the present invention was completed. The present invention will be described in detail below.

Activated carbon powder is not particularly limited. Examples include coal base charcoal, coconut shell charcoal, charcoal, coal, lignite, oil carbon, and sulfuric acid sludge.

Although CMC is not limited, from the viewpoint of improving water resistance, a low viscosity product such as 20 to 50 cps at 1% viscosity is preferable to a wood viscosity product such as 300 to 500 cps at 1% viscosity, and more preferably a high viscosity product. For example, the viscosity is 1.30
0 to 1,500 Cp8 is preferred.

In addition, the amount added is determined from the viewpoint of binder effect with activated carbon.
~10 parts by weight is required, and more preferably 01 to 5% by weight. In addition, the pressure molding conditions are normal pressure, for example, 10 to 15
0 #I/crl is sufficient, and the activated carbon obtained by pressure molding must be heated and dried at 150 to 200'C for several hours, and several hours is in the range of 1 to IO hours. Preferably it is 1 to 8 hours, more preferably 2 to 8 hours. There is no particular limitation on the amount of water, as long as it is sufficient to make CMC an aqueous solution and sufficient for dispersion with activated carbon. Also,
If the temperature is below 150℃, the water resistance of CMC will be insufficient, and the shaped activated carbon will not be able to maintain its shape in water.
It is clear from Tables 1 and 2 that temperatures above 0°C are undesirable because the viscosity of CMC decreases significantly and the binder effect of activated carbon decreases.

Experimental data regarding the ice resistance of CMC is shown in Table 1. The experimental conditions were to cast an aqueous solution of CMC on a glass plate, dry it at room temperature to make a film, and then dry the film in a dryer.
The heated film was dried by heating for 2 hours or 8 hours under the temperature conditions shown in the table, and the heated film was immersed in water for 3 hours and its state was observed.

It can be seen from Table 1 that sufficient water resistance can be obtained by heating and drying CMC at 150 to 200°C for 2 hours.

) ×: Dissolved, Δ: Swelled, 0: Not dissolved Table 2 C
Viscosity due to heat drying of MC) CMCe5. ! The mixture was heated and dried at each temperature for 15 minutes, and then completely dried in a dryer at 78° C. and the viscosity was measured. The viscosity measurement was carried out in Example 1-1. - 400g of carbon black powder and CMC (viscosity 1,
300-1,500 cp8) 3 f! After powder-mixing using an MKS vibration mixer (xz5rpm), 100.9% of water was added and kneaded for 30 minutes, followed by pressure molding (
It was 30kg/c++. Molded product at 18-0'C 2
After time-based heat drying, the molded product was immersed in water for 3 hours, but no abnormality was observed in the molded product.

Comparative Example-1゜The molded product in Example-1 was heated and dried at 140°C for 2 hours,
It was immersed in water under the same conditions as Example-1. The molded product has a black ink-like appearance with activated carbon dispersed in water0 Patent applicant: Daicel Chemical Industries, Ltd.

Claims (1)

[Claims] Carboxymethyl cellulose, which is obtained by adding 0.1 to 10 parts by weight of carboxymethyl cellulose and water to 100 parts by weight of activated carbon powder, kneading and press-molding the obtained activated carbon, and heating and drying it at 150 to 200°C for several hours. Method for producing shaped activated carbon containing