The catalyst for the dehydrogenation of alkylaromatic hydrocarbons

 

(57) Abstract:

The catalyst for the dehydrogenation of alkylaromatic hydrocarbons, including iron oxide, potassium compounds, magnesium compounds and/or compounds of calcium, cerium oxide, molybdenum oxide, Portland cement, oxide and/or strontium ferrite, lanthanum oxide and/or neodymium in the following, wt. % of: potassium compounds 8-22; compounds of magnesium and/or calcium 0,5-10; molybdenum oxide is 0.5-5; cerium oxide 1-8; Portland 5-10; oxide and/or strontium ferrite 0.5 to 10; the oxide of lanthanum and/or neodymium oxide of 0.01-1; iron oxide rest. Optionally, the catalyst may contain an oxide and/or ferrite rubidium and/or cesium in the amount of 0.05-5.0 wt.%. As compounds of potassium, magnesium, rubidium and cesium catalyst may contain oxides, ferrites, or a mixture of oxides and ferrites of these elements. A new catalyst has a high activity and selectivity. 3 C.p. f-crystals, 1 table.

The invention relates to the production of catalysts, namely the production of catalysts for the processes of dehydrogenation of alkylaromatic hydrocarbons.

Known catalyst for the dehydrogenation of alkylaromatic hydrocarbons containing, by weight. %: FeRodnikova L. C., Patanol C. A., Arapov I. P. Catalysts for the dehydrogenation of lower paraffins, olefins and alkylaromatic hydrocarbons, M, Tsniiteneftehim, 1978, S. 49).

Closest to the present invention is a catalyst for dehydrogenation of ethylbenzene following composition, wt.%: Fe2O3- 45-90;2On - 5-40; MgO - 4-30; CEO20-10; NGO30-10; WO30-10; Cao - 0-15, pore-forming, binder and forming agent (Application Germany 3442636, CL 01 J 23/76, 1986).

The disadvantages of these catalysts is their relatively low activity and selectivity.

The aim of the invention is to increase the activity and selectivity of the catalyst.

This is achieved by the fact that a catalyst for the dehydrogenation of alkylaromatic hydrocarbons, including iron oxide, potassium compounds, magnesium compounds and/or calcium, cerium oxide, molybdenum oxide, Portland cement, oxide and/or strontium ferrite, lanthanum oxide and/or neodymium oxide at the following content, wt.%: potassium compounds 8-22; compounds of magnesium and/or calcium 0,5-10; cerium oxide 1,0-8,0; molybdenum oxide 0,5-5,0; Portland 5,0-10,0; oxide and/or strontium ferrite 0.5 to 10.0; the oxide of lanthanum and/or neodymium oxide 0,01-1,0; OK cesium in the amount of 0.05-5.0 wt.%.

As compounds of potassium, the catalyst may contain ferrite and/or potassium oxide.

As compounds of magnesium catalyst may contain ferrite and/or magnesium oxide.

The difference of the catalyst from the prototype is the content of oxide and/or strontium ferrite, lanthanum oxide and/or neodymium, as well as the possible content of the oxide and/or ferrite rubidium and/or cesium in the specified component. The new composition of the catalyst can significantly increase its activity and selectivity.

As a raw material for the inventive catalyst can be used oxides or decompose to oxides of the compounds listed components, as well as ferrites.

The proposed catalyst is prepared by mixing a predetermined ratio chopped oxides or decomposing to the oxide compounds of iron, oxide and/or strontium ferrite, oxide or easy to decompose to oxides of compounds of molybdenum, cerium, lanthanum and/or neodymium compounds of magnesium and/or calcium, pre-cooked ferrites potassium, rubidium and/or cesium. The components are mixed and impregnated with an aqueous solution of alkali promoters, such as Carbo the clients of the catalyst.

The catalyst mass is stirred for 0.5-2.5 hours until a homogeneous mass is then formed by extrusion into bundles, dried at 100-170oC and calcined at 550-750oC.

The invention is illustrated by the following examples:

Example 1.

The dry ingredients of the catalyst, g: iron oxide - 117,98; molybdenum oxide - 2; cerium oxide - 8; Portland cement - 24; oxide of strontium - 5; oxide of lanthanum - 1, magnesium oxide - 10, mixed for 1 hour. Add 30 ml of an aqueous solution containing 47 g of potassium carbonate. The catalyst mass is stirred for 1.75 hours until a homogeneous mass is then formed by extrusion into bundles with a diameter of 3.0 mm, dried at a temperature of 120oC and calcined at 650oC for 3 hours.

Get the catalyst composition, wt. %: iron oxide - 58,99; potassium carbonate 16 (counting on the oxide basis); magnesium oxide - 5; molybdenum oxide - 1; cerium oxide - 4; Portland - 12; oxide of strontium - 2,5; lanthanum oxide is 0.5.

Testing of the catalyst is carried out in a reaction dehydrogenation of ethylbenzene to styrene at a temperature 62020oC, the speed of flow of the liquid ethylbenzene 0.5 to 1.5 liters/liter of catalyst per hour and the mass dilution of the raw water steam 1: 2-3. Data for testing catalyzer 1, but instead of magnesium oxide used magnesium carbonate, instead of molybdenum oxide is used molybdenum acid, optionally add rubidium nitrate, and instead of the iron oxide used the hydrate of iron oxide. Data on chemical composition (including oxide) and testing of the catalyst shown in the table.

Example 3.

The catalyst prepare and test as in example 2, but instead of magnesium carbonate uses calcium oxide, instead of potassium carbonate using potassium hydroxide instead of rubidium nitrate injected rubidium carbonate together with carbonate, cesium, strontium compounds using strontium ferrite, and iron oxide used magnetite (Fe3O4). Data on the composition and testing of the catalyst shown in the table.

Example 4.

The catalyst prepare and test as in example 3, but instead of cesium carbonate and rubidium enter hydroxide rubidium and cesium, instead of the oxide of calcium using calcium carbonate instead of the oxides of cerium, lanthanum and neodymium are used carbonate cerium, lanthanum and neodymium, as compounds enter the potassium ferrite, and iron compounds used mixture (50/50%) hydrate iron oxide and magnetite. Data pulsator prepared analogously to example 2, but additionally injected calcium oxide, instead of magnesium carbonate is injected magnesium ferrite, instead oxide use strontium hydroxide strontium, instead of rubidium nitrate injected cesium carbonate and experience in the reaction of dehydrogenation of cumene, alpha-methylstyrene at a temperature 56020oWith a feed rate of the liquid cumene 0.5 to 1.5 liters/liter of catalyst per hour and the mass dilution of the raw water vapor of 1: 3. Data on the composition and testing of the catalyst shown in the table.

Example 6.

The catalyst is prepared analogously to example 1, but as compounds of strontium, potassium and magnesium use ferrites corresponding compounds, impose additional calcium oxide, and the catalyst was tested in the reaction of dehydrogenation of cumene in alpha methylsterol under the conditions described in example 5. Data on the composition and testing of the catalyst shown in the table.

Example 7.

The catalyst is prepared analogously to example 6, but as compounds of potassium, magnesium and cesium use a mixture of carbonates and ferrites of these elements in the ratio of carbonates (including oxide) / ferrites as 1/0,1 and experience in the reaction of dehydrogenation of ethylbenzene under the conditions described in example 1. prepared analogously to example 7, but instead of carbonate and ferrite cesium use carbonate and ferrite rubidium in the ratio of 1/3 and a mixture of carbonates and iron potassium and magnesium in a ratio of 1/7. The catalyst was tested in the reaction of dehydrogenation of ethylbenzene under the conditions described in example 1. Data on the composition and testing of the catalyst shown in the table.

Example 9.

The catalyst is prepared analogously to example 7, but using a mixture of carbonates and iron, potassium, magnesium, rubidium and cesium in the ratio of carbonates/ferrites = 1/10. The catalyst was tested in the reaction of dehydrogenation of ethylbenzene, data on the composition and testing of the catalyst shown in the table.

1. The catalyst for the dehydrogenation of alkylaromatic hydrocarbons, including iron oxide, potassium compounds, magnesium compounds and/or calcium, molybdenum oxide, cerium oxide and Portland cement, characterized in that it further contains an oxide and/or strontium ferrite, lanthanum oxide and/or neodymium oxide in the following ratio, wt.%:

Potassium compounds - 8-22< / BR>
Compounds of magnesium and/or calcium and 0.5-10

Molybdenum oxide is 0.5 - 5

The cerium oxide - 1-8

Portland - 2-12

Oxide and/or strontium ferrite is 0.5 - 10

OK, he further comprises an oxide and/or ferrite rubidium and/or cesium in the amount of 0.05-5.0 wt.%.

3. The catalyst p. 1, characterized in that compounds of potassium it contains ferrite and/or potassium oxide.

4. Catalyst under item 1 or 2, characterized in that as, compounds of magnesium it contains ferrite and/or magnesium oxide, as well as, the calcium it contains calcium oxide.

 

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