Catalyst for oxidation of organic compounds

 

(57) Abstract:

Usage: upon receipt of the catalysts for the processes of deep heterogeneous oxidation of organic compounds contained in the gas emission into the atmosphere of the production of synthetic rubbers. The inventive catalyst comprises, by weight. oxide copper 5,0-10,0: Nickel oxide 5,0-10,0: potash 40,0-45,0: Kremlevsky sodium or potassium 0,7-1,5: magnesium oxide 3,0-5,0. The ratio of magnesium oxide to krimpolikom the sodium or potassium is (2-7):1. table 1.

The invention relates to the production of catalysts for the processes of deep heterogeneous oxidation of organic compounds contained in the gas emissions of the production of synthetic rubbers.

In the production of synthetic rubbers at the stage of drying a large quantity of air contaminated with organic compounds. To clean the air before release to the atmosphere contained organic substances are subjected to thermal oxidation in a reactor with capacity up to 180 thousand m3/h at space velocity of air pollution 15000-20000 h-1. Up to the present time this process is used Alu is utilizator is its low resistance to catalyst poisons (sulfur compounds) and very high cost.

Closest to the proposed technical solution is the catalyst for the oxidation of organic compounds containing, by weight.h. oxide copper 5-10; potash 40-45; Nickel oxide 5-10; Kremlevsky sodium or potassium 3-5; hydrate of calcium oxide (A. C. 1189499, class B 01 J 20/06, publ. 1985), has a high activity in the oxidation of organic compounds in air emissions, resistant to catalytic poisons, cheap. However, has a significant drawback. As shown by the experimental-industrial tests, the main disadvantage of this catalyst is the low abrasion resistance. As a result, the high speed air flow in the reactor, the catalyst begins to be used up in the dust and after 150 h of operation of the reactor is made of about 10 about. and after 500 h about 40. the loaded amount of catalyst. Further tests were discontinued because of the need for regular stops so that the reactor and conventional heat exchangers catalyst dust.

The purpose of the invention to provide a catalyst for the oxidation of organic compounds with high activity, resistance to catalytic poisons, as well as high abrasion resistance.

Pospolita synthetic rubbers, includes copper oxide, Nickel oxide, hydrate of calcium oxide, potassium carbonate, silicic acid potassium or sodium, additionally contains magnesium oxide relative to silicon-acidic sodium or potassium 2-7:1 in the following ratio, wt. Oxide copper 5,0-10,0 Oxide Nickel 5,0-10,0 potash 40,0-45,0 Kremlevsky sodium or potassium 0,7-1,5 magnesium Oxide 3,0-5,0

The hydroxide cal - tion Rest

P R I m e R 1. In the mixer load 400 g of potassium carbonate, 363 g of calcium hydroxide, 100 g of copper oxide, 100 g of Nickel oxide, 7 g of silicic acid sodium, 30 g of magnesium oxide and stirred for 1 h Then the mixture was added 100 ml of demineralized water and stirred for 0.5 H. the resulting paste is formed into strands with a diameter of 31 mm and dried at 110-120aboutC for 2 h

The samples in examples 1 to 7 prepared in the same way.

P R I m e R 8 (the prototype). In the mixer load 400 g of potassium carbonate, 370 g of calcium hydroxide, 100 g of copper oxide, 100 g of Nickel oxide, 3 g crenneville sodium and preparing the catalyst as described in example 1.

Testing the activity of samples of the catalysts carried out in a laboratory setup flow type with bubbling mixer. Prepared gas mixture air is heated, into the reactor to the catalyst bed. The temperature oxidation 400aboutWith, the volumetric rate of the gas mixture 20000 h-1. The concentration of styrene in the source and purified mixtures determined chromatographically.

The compositions of the obtained catalysts and the results of their testing are presented in the table.

As can be seen from the table results, the introduction of the catalyst is magnesium oxide in relation to a silicic acid sodium (potassium) 2-7:1 when the claimed ratio of components can significantly improve its abrasion resistance, as well as to maintain high efficiency during long-term operation. Improving the durability of the catalyst attrition makes it possible to increase the stability of the catalyst and process of purification of the gas mixture for a long period of time, allows for the catalytic oxidation of styrene with its content of 0.3-0.5 mg/l in a mixture with air in the presence of sulfur-containing compounds without destroying the pellets and reducing the activity of at least one year.

Testing of the catalyst prepared according to example 1, in real conditions on the pilot plant showed stable operation of the catalyst during the year (8000 hours). With nisene content of magnesium oxide in comparison with the claimed number of leads to lower strength catalyst attrition, and the increase is impractical because it does not give a positive result.

Thus, the catalyst of the proposed structure allows the process flue gas manufacturing synthetic rubber with high efficiency for a long time without re-loading a fresh catalyst, but also significantly reduce the cost of the cleaning gas by eliminating costly aluminium oxide-platinum catalyst used in the present time.

CATALYST FOR oxidation of ORGANIC COMPOUNDS in the exhaust gases of the production of synthetic rubbers, including copper oxide, Nickel oxide, hydrate of calcium oxide, potassium carbonate, Kremlevsky sodium or potassium, characterized in that it further comprises magnesium oxide in relation to krimpolikom sodium or potassium 2 7 1 in the following ratio, wt.

Oxide copper 5,0 10,0

Oxide of Nickel 5,0 10,0

Potash 40,0 45,0

Kremlevsky sodium or potassium 0,7 1,5

Magnesium oxide 3,0 5,0

The hydrate of calcium oxide Rest

 

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15 cl, 9 ex, 19 dwg, 3 tbl

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10 cl, 2 dwg, 1 tbl, 2 ex

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1 tbl, 3 ex

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9 cl, 1 tbl

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6 cl, 1 tbl, 5 ex

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2 tbl, 22 ex

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