Single-particle crush strength

The first is the strength of anti-fracture. This experimental method is divided into single particle crush strength (SPCS), the whole stack crush strength (WSCS) and the drop-shatter test. 

Spherical catalysts are usually characterized by the single-particle crush strength. Assuming that the horizontal projection area of a catalyst is f l (m / pellet), the munber of catalyst pellets on miit cross-sectional area of the bed bottom is given by ... 

With the development of catalytic processes such as reforming, hydrocracking and hydrotreating, which utilize formed particles, single pellet crush strength tests were devised by the manufacturers and users of such catalysts. These tests were developed in order to determine the ability of the catalyst particles to maintain integrity during use in catalytic reactors. (2)... 

D-4179 Single Pellet Crush Strength of Formed Catalyst Shapes Strength of spherical or tablet shaped particles individually crushed between two flat surfaces ... 

Measurement for tablets, spheres, extrudates, monoliths, and so on, is quite simple. A single particle or unit representative of the lot is placed between parallel plates of a device capable of exerting compressive stress, and the force necessary to crush the material is noted. Tablets, extrudates, or monoliths can be placed within the plates so as to measure axial or radial crush strength. Naturally, a sufficient number of particles must be tested to obtain proper statistics. The method cannot be reliably used for granular or other materials with irregular shapes. 

Others used the principles of soil mechanics to study the size effect of the crush strength of a single particle, and proposed that the behavior should follow Huit s equation. ... 

For a 0.565 cm spherical catalyst, the horizontal projection area Pi = 7r(0.565) /4. Taking the above parameters of the axial flow converter, / = 2.72 kgf/pellet can be calculated by equation (8.48). However, in reality, the force acting on the catalyst particles is between points of contact and the bed area the value of / calculated using the horizontal projection area is therefore smaller, and should be only used as a reference. Table 8.37 shows the single crush strength of several spherical catalysts. 

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