JPS60132643A - Molded zeolite - Google Patents

Abstract

PURPOSE:To obtain molded zeolite prevented from the lowering in adsorbing capacity, by containing sepiolite as the binder of molded zeolite. CONSTITUTION:Sepiolite is used as a binder to mold powdery zeolite while the molded one is dried and sintered at a proper temp. to obtain high performance molded zeolite. Thus molded zeolite shows high adsorbing capacity and the range of use thereof is widened.

Description

[Detailed description of the invention] Regarding.

Structure of conventional examples and their problems Zeolite (% synthetic zeolite) is usually obtained as a fine powder. For ease of handling and to ensure ventilation performance for the adsorbed gas when filled, it is necessary to mold it into a cylindrical or spherical shape. However, so-called clays such as kaolinite and bentonite are conventionally used as binders for molding, and these clays have no function other than binding, so the amount of adsorption per volume per weight of zeolite is small. was decreasing.

OBJECTS OF THE INVENTION The object of the present invention is to obtain a shaped zeolite without deteriorating its adsorption performance by shaping the zeolite with a binder having an adsorption function.

Structure of the Invention In the present invention, powdered zeolite is molded using sepiolite as a binder, and then dried and sintered at an appropriate temperature to obtain a high-performance molded zeolite.

Description of Examples Currently, zeolites are classified into a wide variety of types depending on the types of metal cations contained in them, the ratio of alumina and silica that constitute the zeolites themselves, and their crystal structures. It is also applicable to zeolites.

On the other hand, Seviolite is a type of natural mineral that is normally used as a thickener for making liquids and to absorb oil spilled on the floor. We focused on the fact that this material has both the function of adsorbing moisture and the function of a binder when making sintered bodies, and by using it as a binder for zeolite, we succeeded in obtaining a high-performance molded zeolite. The manufacturing method used when carrying out the present invention will be described below.

So-called 13X type powdered zeolite (does not contain binder) 1 to 2 to 6 to 3% sepiolite, about 20% to obtain particularly good results, was added and mixed for about 1 hour in a ■ type mixer to make it homogeneous. . Furthermore, 400 y of water was added to carry out a dosing for about 2 hours. Thereafter, it was molded into a cylindrical pellet with a diameter of 1.6 mm using a compression molding machine, dried at 150°C for 3 hours, and sintered at about 660°C for 1 hour. The higher the sintering temperature is set, the harder the molded body can be obtained, but this also causes changes in the fine crystal structure of sepiolite and zeolite, which reduces adsorption performance.

Considering two contradictory factors, the sintering temperature should be 400~
A range of 600°C is desirable.

Experimental examples proving the effects of the present invention will be described below.

The material of the present invention and zeolite obtained by molding in the same manner as in the present invention using the same weight ratio of bentonite as a binder as a conventional example for comparison were dried at 350°C for 6 hours, and then dried at room temperature (250°C) with a relative humidity of 100%. ℃) in a container.
Changes in the amount of water adsorbed (grams per 100 y of dry zeolite) over time were measured. The results are shown in the figure. From the figure, it can be said that the moisture absorption rate of the present invention is improved by about 25 inches over the conventional example. I still have to measure the maximum amount of adsorbed water.The two types of samples mentioned above were left in a container at a room temperature of 25°C and a relative humidity of 100% for 24 hours, and then the amount of adsorbed water was measured.Conventional Example 277
On the other hand, the present invention achieved a large improvement of 35y, also about 3oq6.

Effects of the invention Zeolite is currently used as a main component of detergents, a catalyst for chemical reactions,
Zeolite is widely used in various fields such as desiccants and adsorbents for chemical heat pumps, and the adsorption performance of zeolite is a major factor in all applications. Therefore, the present invention, which provides high adsorption performance, can be effectively applied to all of these uses.

[Brief explanation of the drawing]

Figure J is a graph showing the adsorption rates of two types of zeolites, one example of the present invention and a conventional example. Name of agent Patent attorney Toshio Nakao and 1 other person~ It θ Time (hours)

Claims (1)

[Claims] A shaped zeolite characterized by containing sepiolite as a binder.