The method of preparation alimohammadi catalyst for dehydrogenation and dealkylation of hydrocarbons

 

(57) Abstract:

The essence of the invention: ball mill load chromic acid, add water and aluminum oxide in the amount of 2-3 wt.% from the total mass of the catalyst, stirred for 10 minutes In the mixer load aluminum oxide, crushed presidency aluminum hydroxide, water, and the resulting solution stirred for 30 minutes the resulting mass is discharged from the mixer, molded and dried. Grind up of particles of not less than 1 mm, the resulting powder was loaded into the mixer, add a solution of chromic acid, obtained above, and water. A lot plastificator, formed into bundles and dried. Subjected to heat treatment at 650°C for 5 h in a vapor medium containing 10% water vapor. 3 table.

The invention relates to the production of catalysts, in particular alimohammadi catalyst for dehydrogenation of paraffins and dealkylation of alkylaromatic hydrocarbons.

A method of obtaining alimohammadi catalyst for dehydrogenation of hydrocarbons by double impregnation combined media chromic acid, which consists in the fact that the mixture of powdered alumina and perezajennogo aluminum hydroxide impregnated with the rum acid, plastificator, molded, dried and subjected to heat treatment in an environment of steam at 700aboutC for 10h (1). However, this catalyst is not sufficiently active in the processes of dehydrogenation of paraffins and dealkylation of alkylaromatic hydrocarbons.

The closest in technical essence and the achieved result is a cooking method alimohammadi catalyst for dealkylation and cyclization of hydrocarbons, consisting in multiple impregnation by plasticization of the combined carrier, consisting of 10-15 wt.% ground perezajennogo aluminum hydroxide and 90-50 wt.% unground alumina (technical alumina) in an aqueous solution of chromic acid, followed by molding, drying after each impregnation and heat treatment. The aluminum oxide in the amount of 10-50 wt.% from the incoming to the media pre-grind to a fraction of 1-25 μm. (2).

The method is distinguished by the complexity of technology, the resulting catalyst has insufficient activity.

The purpose of the invention is obtaining a catalyst with increased activity.

This goal is achieved by the described method of preparation alimohammadi catalyst for degausser a mixture perezajennogo aluminum hydroxide and aluminum oxide, a solution of chromic acid, which is dissolved 2-3 wt.% aluminum oxide by weight of the total catalyst, followed by shaping, drying after each impregnation and heat treatment.

The activation heat treatment of the catalyst obtained by this method, it is possible to perform in any environment, preferably in vapor.

The promoting effect peptization chromic acid containing from 2 to 3% of aluminum oxide in the form of lameness and Zola finely dispersed oxide, because of its low patsatsia unground powder of alumina and, as a consequence, a lack of education on its surface chromate aluminum, on the basis of which the active centers are created.

P R I m e R 1. 44,7 cm3chromic acid containing 1000 g/DM3chromic anhydride, loaded into a ball mill, add 15,7 cm3water and 4.3 g of alumina, that is, 2.5 % aluminum oxide by weight of the total catalyst. Then in the mill load 700 g beads and stirred for 10 min.

30,0 cm3 obtained solution is injected into the mixer, where the pre-load of 92.8 g commodity aluminum oxide (alumina) having a particle size of not less than 30 μm, 71 g raspologaet from the mixer, molded and dried, then ground to particles less than 1 mm

The resulting powder was again loaded into the mixer, add 30 cm3chromic acid, obtained as described above and 22 cm3water. A lot plastificator 30 min, formed into bundles, dried and subjected to heat treatment at 650aboutC for 5 h vapor medium containing 10% water vapor.

The finished catalyst contains 18 wt.% oxide of chromium, 0.2 wt.%, sodium oxide, the rest is aluminum oxide.

The resulting catalyst was tested in the reaction of dehydrogenation of butane in a vacuum. Test conditions: Temperature 575aboutWITH

The residual pressure of 125 mm RT. Art.

The volumetric feed rate of 400 h-1The raw material composition: butane-99,4-%,

isobutane-0,6%

The test results are given in table. 1.

P R I m m e R 2. The catalyst is prepared analogously to example 1, only in a bead mill administered 3 g of alumina (2% Al2O3). The test results are given in table. 1.

P R I m e R 3. The catalyst is prepared analogously to example 1, only in a bead mill injected 5.7 g of alumina (3% Al2O3). The test results are given in table. 1.

A comparison of the data table. 1 shows that the activity of the and valuable monomer - butadiene.

The catalyst activity increases due to increased peptization of the surface and formation of active centers.

P R I m e R 4. The catalyst, prepared as described in examples 1,3, experience in the reaction dealkylation of toluene at 620aboutC, a pressure of 6 MPa, a space velocity of toluene 0.4 m-1molar dilution of hydrogen toluene 5: 1 catalyst Loading 100 cm3the grain 3x4 mm the test Results are given in table. 2.

As can be seen from the table. 2, the activity (output benzene) of the samples obtained by this method increases.

P R I m e R 5. The catalyst prepared according to example 1, the face during the dealkylation industrial benzene-toluene-xylene (BTX) fraction at a temperature of 620aboutC, a pressure of 6 MPa, the space velocity of the raw material of 0.4 h-1molar dilution of hydrogen: feedstock 5:1. The composition of the raw material wt.%.: benzene 8,5; toluene 45,4; ethylbenzene 7,3; xylenes 38,0; hydrocarbons, C9, 0,7.

The results in table. 3.

From the comparison of the obtained data shows that the activity of the catalyst obtained by this method increases.

The METHOD of PREPARATION ALIMOHAMMADI CATALYST D is predstavljauwego a mixture perezajennogo aluminum hydroxide and aluminum oxide, a solution of chromic acid, followed by shaping, drying after each impregnation and heat treatment, characterized in that, in order to obtain a catalyst with increased activity, in a solution of chromic acid dissolved in 2 - 3% aluminum oxide by weight of the total catalyst and the resulting solution used for impregnation of the carrier.

 

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