Method for limiting the emission of dust from catalyst grains

Abstract

The present invention relates to a method for limiting the emission of dust from catalyst grains. Said method comprises the following two consecutive steps: a first step of performing a heat treatment of the catalyst grains at a temperature no lower than 100 DEG C, followed by a second step of coating the surface of the catalyst grains by placing same in contact with one or more coating materials having a melting point T no lower than 45 DEG C and which are injected in a solid state, said second step being carried out with no further addition of heat, at a temperature of T-60 DEG C to T-1 DEG C, while remaining no lower than 40 DEG C.

Description

technical field

[0001] The present invention relates to a method especially aimed at limiting the dust emitted by the catalyst in the form of grains during the treatment of the catalyst. Background technique

[0002] Catalysts in question are, for example but not limited to, catalysts used in processes for the treatment of hydrocarbons, especially in the field of petroleum refining, in the field of petrochemistry and in the field of chemistry, especially in processes for the conversion of hydrocarbyl compounds catalyst.

[0003] Hydrocarbon treatment processes carried out in refineries and / or petrochemical plants include treatments mainly aimed at modifying the structure of the hydrocarbon molecules and / or eliminating undesired compounds from hydrocarbon-based fractions, such as in particular sulfur-containing compounds, nitrogen-containing compounds, aromatic compounds and metal compounds. As non-limiting examples, mention may be made of naphtha reforming processes, hydro...

Examples

Embodiment

[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, ...

technical field

[0001] The present invention relates to a method especially aimed at limiting the dust emitted by the catalyst in the form of grains during the treatment of the catalyst. Background technique

[0002] Catalysts in question are, for example but not limited to, catalysts used in processes for the treatment of hydrocarbons, especially in the field of petroleum refining, in the field of petrochemistry and in the field of chemistry, especially in processes for the conversion of hydrocarbyl compounds catalyst.

[0003] Hydrocarbon treatment processes carried out in refineries and / or petrochemical plants include treatments mainly aimed at modifying the structure of the hydrocarbon molecules and / or eliminating undesired compounds from hydrocarbon-based fractions, such as in particular sulfur-containing compounds, nitrogen-containing compounds, aromatic compounds and metal compounds. As non-limiting examples, mention may be made of naphtha reforming processes, hydro...

Examples

Embodiment

[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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