Method for limiting the emission of dust from catalyst grains
A catalyst particle, catalyst technology, applied in catalyst protection, chemical instruments and methods, catalyst activation/preparation, etc., to achieve the effects of effective removal, good loading density, and easy handling
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[0120] The following examples are given by way of illustration of the invention only.
[0121] Methodologies used to characterize catalysts:
[0122] The mechanical strength properties of Catalysts A to H described in the Examples below were evaluated according to the test for determining catalyst attrition, which characterizes the impact strength of the catalysts.
[0123] A 50 g catalyst sample was used to determine this parameter according to the operating procedure proposed by the ASTM D-4058 standard, which included: placing the catalyst sample on its generatrix equipped with baffles (sheets welded to the inner wall of the roll) shaped metal plate) in a cylindrical drum (drum); then, after closing the drum with a lid, the assembly (assembly) was rotated for 30 minutes; The resulting fines were eliminated and the weight loss of the catalyst samples was measured. The weight percent of fines produced is then calculated.
[0124] This test enables the simulation of success...
Embodiment 4
[0169] Embodiment 4: (consistent with the present invention)
[0170] Catalyst A was treated as follows:
[0171] 1 kg of catalyst was placed in a 3 liter volume stainless steel drum at 4 rpm. A stream of hot air was then sent to the catalyst to bring its temperature to 140°C to simulate the drying / activation step or output from the regeneration process.
[0172] The catalyst bed was then cooled until the catalyst bed reached a temperature of 80° C., and then 15 g of synthetic wax (with an average particle size of 150 μm, melting point 115° C.) was added to the drum. The mixture was homogenized for 60 minutes and then cooled to ambient temperature. Since the mixture still contained fines, it was sieved on a 20 mesh (0.85 mm) sieve to obtain Catalyst E (consistent with the invention).
[0173] Analysis of Catalyst E showed that Catalyst E contained 0.3 wt% carbon, which corresponds to 0.4 wt% wax.
[0174] Catalyst E had an attrition of 0.6% and had a PM10 fine dust generat...
Embodiment 6
[0184] Embodiment 6: (consistent with the present invention)
[0185] Catalyst A was treated as follows:
[0186] 1 kg of catalyst was placed in a 3 liter volume stainless steel drum at 4 rpm. A stream of hot air was then sent to the catalyst to bring its temperature to 140°C to simulate the drying / activation step or output from the regeneration process.
[0187] The catalyst bed was then cooled until the catalyst bed reached a temperature of 80°C before 20 g of micronized synthetic wax (with a particle size of 5 μm, sold by MicroPowders under the code MP-620XXF, melting point 115°C) was added to the drum. The mixture was homogenized for 30 minutes and then cooled to ambient temperature to obtain coated catalyst G (in accordance with the invention).
[0188] Analysis of Catalyst G showed that Catalyst G contained 1.7 wt% carbon, which corresponds to 2 wt% wax.
[0189]The particles of Catalyst G were covered with a wax layer having an average thickness of 12 μm on average, ...
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