JPS5969146A - Production of filter-like adsorbent using powdery activated carbon as raw material - Google Patents

Abstract

PURPOSE:To produce a filter-like adsorbent having the adsorptive power approximate to the adsorptive power of activated carbon and having small resistance in permeation of air by mixing a mixture consisting of specific ratios of activated carbon, bentonite and an inorg. adhesive agent with water and drying the same after molding. CONSTITUTION:A mixture of 40-70 powdery activated carbon, 10-30 bentonite and 10-40 inorg. adhesive agent is thoroughly mixed, then 80-120% water based on the weight of said mixture is added thereto with thorough mixing; thereafter the mixture is molded to a filter shape of an optional shape and size, and is dried, whereby the filter-like adsorbent for air cleaner or the like is obtd. with the inexpensive materials. A silicate compd. of cement base is usable for the above-mentioned inorg. adhesive agent.

Description

DETAILED DESCRIPTION OF THE INVENTION Recently, there have been requests from various quarters for adsorbent materials with a size of several centimeters to several tens of centimeters. For example, in the air conditioning industry, there is a strong demand for a filter-like adsorbent with low ventilation resistance that can be used together with a filter to remove suspended particles in the air purification process, and can adsorb and remove odor components.

Activated carbon, which is said to be the most effective adsorbent for malodorous components, is in the form of powder or granules of several mm.

Currently, attempts are being made to mold this granular activated carbon into a filter-like adsorbent using an organic adhesive, but the adhesive forms a film and covers the surface of the activated carbon, reducing its adsorption power. There are few examples of this being put to practical use because the airflow resistance is significantly reduced or the ventilation resistance is extremely large.

Therefore, we investigated a method for producing a filter-like adsorbent that has an adsorption power close to that of activated carbon, but also has low ventilation resistance.

As a result, it was possible to form a filter-like adsorbent from powdered activated carbon using bentonite 1 as the surface material and a so-called cement-based silicate compound as the adhesive. In this method, bentonite and silicate compounds are inexpensive materials and can be molded without impairing the adsorption power of activated carbon, and molded products of arbitrary shapes can be obtained by selecting the mold.

Example having 77 pores with a diameter of Jmm / OX / OX
Powdered activated carbon, bentonite, silicate compound, and water are mixed into a mold that can produce a 0.3 cm plate-shaped product.
: 15 :, 23 : 100 were mixed well and molded at a pressure of 30 Kg/cm'.

The molded product was dried at / / O''C for 3 hours to obtain a plate-shaped adsorbent. Table 1 shows the various performances of this plate-shaped adsorbent.

Table 1 Performance of plate-shaped adsorbent l) The adsorbent was crushed and the crushed material was measured according to JIS for granular activated carbon.

2) Air was vented at a rate of 201/min.

Patent applicant: Nakajima Chemical Industry Co., Ltd. Toshiyuki Nakajima

Claims (1)

[Claims] Powdered activated carbon, bentonite and pyrotechnic adhesive/l
Add 0 to 720% of water based on the weight of the mixture to a well-mixed mixture with a ratio of 0 to 70: 10 to 30: IO to 0, mix well, and then form a filter of any shape and size. A method of manufacturing filter-like adsorbents by molding and drying.