A method of obtaining a nickel catalyst for hydrogenation of aromatic hydrocarbons

 

(57) Abstract:

Describes how to obtain a Nickel catalyst for hydrogenation of aromatic hydrocarbons, including the application of Nickel on alumina powder medium with subsequent formation of a granular catalyst, characterized in that as alumina media use-Al2O3the application of metallic Nickel is carried out by chemical recovery from a solution containing a salt of Nickel, a reducing agent and complexing agents, followed by rinsing in water and drying at a temperature of 120-150°C, the formation of granules of the catalyst in the form of porous plates is carried out by plasma spraying in an inert substrate. The technical result is an increase in the activity of the Nickel catalyst for hydrogenation at lower pressure in the system, excluding the pre-activated catalyst, as well as increasing its mechanical strength. table 1.

The invention relates to the field of chemical and petrochemical industry, namely the production of Nickel catalysts on alumina carriers, and can be used in hydrogenations aromaticheskikhO2specific shape and porous structure) with aqueous solutions of Nickel salts followed by calcination and recovery in a stream of hydrogen (Setterfield Hours Practical course of heterogeneous catalysis. - M.: Mir, 1984, S. 185). The process in the presence of such a catalyst is carried out at temperatures of 150-200oC and a pressure of about 3 MPa.

The main disadvantage of this method is the use as a carrier of low-temperature forms of alumina (boehmite, pseudoboehmite, -Al2O3and others ), which allows to obtain a catalyst of a specific porous structure, but at the same time reduces its mechanical strength.

Closer to the invention of the technical essence is a method of obtaining, based on the mechanical components are mixed in the presence of a liquid phase. In particular, the method of producing a catalyst containing 50% NiO (39,3% Ni), by mixing the basic Nickel carbonate with alumina media (mixture-Al2O3and-Al2O3at a ratio of 0.05:0.95 to) in the presence of patinator - aqueous solution of ammonia, followed by drying at 100-120oC and calcining at 300 to 500oC, chopping, mixing with graphite and pelletizing (RU, patent, 2102145, CL 01 J 37/04, 1998).

-1.

However, the Nickel catalyst obtained in this way has insufficient activity and requires the use of high hydrogen pressures.

The basis of the invention the task is to increase the activity of the Nickel catalyst for hydrogenation at lower pressure in the system, to eliminate the preliminary activation of catalyst, and also to enhance its mechanical strength.

The invention consists in obtaining a Nickel catalyst for hydrogenation of applying the metallic Nickel powder of alumina media (-Al2O3), by chemical recovery from a solution containing a salt of Nickel, a reducing agent and complexing agents, followed by rinsing in water and drying at a temperature of 120-150oC and obtain porous structures in the form of plates by plasma spraying in an inert substrate.

The method of preparation of the catalyst is carried out as follows.

The calculation of the number of ishodnoe by the formula:

< / BR>
G NiCl26H2O - content of Nickel chloride in solution (g/l);

V - volume of solution;

n is the number of regenerations;

(% Ni) - set the percentage of Nickel in the finished catalyst.

In a solution containing 48 g/l of Nickel chloride and 70 g/l of sodium citrate (complexing agents), pour 220 g/l of alumina powder, mix thoroughly and leave for 5-6 hours at a temperature of 20-25oC. This operation provides activating powder media before plating it with Nickel. Then add 200 ml/l of hydrazine hydrate (reducing agent) and with constant stirring, adding sodium hydroxide to bring the pH of the solution to values of 13-14 and her constant support. Gradually heat the solution to a temperature of 70-80oC. Check the color of the solution using a glass tube. When the bleaching solution regenerate, giving him a dry salt of Nickel chloride (48 g/l). The number of regenerations is determined by the Nickel content in the catalyst.

At the end of the process the resulting powder was thoroughly washed first 6-7 times with tap water, then 1-2 times distilled. Dried at a temperature of 120-150oC.

Using plasma installation pole maximum porosity structure with sufficient mechanical strength.

The catalytic properties of the samples of Nickel catalysts was investigated in the reaction of hydrogenation of the aromatic hydrocarbons (toluene) on microprotol installation flow type at a pressure of 0.25 MPa, the feed rate of the hydrogen - 18 l/h and flow rate of feed of 0.5 h-1. The results of catalytic tests of samples with different Nickel content presented in the table.

As can be seen from the data presented in the table, the Nickel catalyst obtained by the proposed method, at a temperature of 150oC and low pressure (0.25 MPa) provides complete conversion of toluene with less in comparison with the prototype, the Nickel content (22%). Use as a carrier-Al2O3and plasma methods of forming patterns of the catalyst can improve its mechanical strength.

A method of obtaining a Nickel catalyst for hydrogenation of aromatic hydrocarbons, including the application of Nickel on alumina powder medium with subsequent formation of a granular catalyst, characterized in that as alumina media use-Al2O3the application of metallic Nickel is carried out by holidaysa washing in water and drying at a temperature of 120 150oWith the formation of granules of the catalyst in the form of porous plates is carried out by plasma spraying in an inert substrate.

 

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