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Method for preparing 1,3-butadiene from normal butene by using continuous-flow dual-bed reactor

A flow reactor, butadiene technology, applied in chemical instruments and methods, dehydrogenation to hydrocarbons, carbon compound catalysts, etc., can solve the problems of complex catalyst structure, side reactions, large energy consumption, etc.

Inactive Publication Date: 2011-02-23
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the naphtha cracking method has problems in that a large amount of energy is consumed due to high reaction temperature, and a new naphtha cracker must be installed to meet the increasing demand for 1,3-butadiene
In addition, the naphtha cracking method also has the problem that this method is not an independent process for producing only 1,3-butadiene, and thus cannot optimally satisfy 1, 3-butadiene production and demand, and the process produces excessively other basic fractions than 1,3-butadiene
In other words, there is a problem that it is necessary to continuously add metal components to increase the catalytic activity, therefore, the structure of the catalyst is very complicated, and the mechanism of the preparation of the catalyst is also complicated, and as a result, it is difficult to repeatedly prepare the catalyst
However, since ferrite catalysts partially substituted with metals or multicomponent ferrite catalysts cannot be reproducibly prepared, these catalysts are difficult to apply commercially.
Furthermore, since the C4 mixture used as a reactant in the present invention contains various other components besides n-butane which is known to degrade the catalyst in the oxidative dehydrogenation of n-butene [L.M. Welch, L.J. Croce , H.F.Christmann, Hydrocarbon Processing, 131 pages (1978)], so there is such a problem: multiple components constituting the multi-component ferrite catalyst may bring side reactions
So far, there have been no attempts to maximize the yield of 1,3-butadiene by exploiting the synergistic effect brought about by the difference in reactivity between multicomponent bismuth molybdate catalysts and single-phase ferrite catalysts. to report

Method used

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  • Method for preparing 1,3-butadiene from normal butene by using continuous-flow dual-bed reactor
  • Method for preparing 1,3-butadiene from normal butene by using continuous-flow dual-bed reactor
  • Method for preparing 1,3-butadiene from normal butene by using continuous-flow dual-bed reactor

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0056] Multicomponent bismuth molybdate (Co 9 Fe 3 Bi 1 Mo 12 O 51 ) Preparation of catalyst

[0057] Cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) as cobalt precursor, iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) as iron precursor, bismuth nitrate pentahydrate (Bi(NO 3 ) 2 ·5H 2 O) as bismuth precursor, ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O) as a molybdenum precursor. All precursors are readily soluble in distilled water except bismuth nitrate pentahydrate, which is readily soluble in strongly acidic solutions. Therefore, bismuth nitrate pentahydrate was dissolved alone in a solution formed by adding nitric acid to distilled water.

[0058] In order to prepare the multi-component bismuth molybdate catalyst, the molar ratio of cobalt:iron:bismuth:molybdenum was set to 9:3:1:12. 7.94 grams of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) and 3.66 g of iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) was di...

preparation example 2

[0064] Multicomponent bismuth molybdate catalysts containing manganese or nickel as metal components with divalent cations Chemical preparation

[0065] For the preparation of multicomponent bismuth molybdate catalysts containing manganese or nickel as the metal component with divalent cations, 7.83 g of manganese nitrate hexahydrate (Mn(NO 3 ) 2 ·6H 2 O) and 7.93 grams of nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O). The preparation conditions of the multi-component bismuth molybdate catalyst are the same as those in Preparation Example 1, except that the types and contents of the precursors with divalent cations are different. The prepared multi-component bismuth molybdate catalyst was analyzed by inductively coupled plasma-atomic emission spectrometry (ICP-AES). From the ICP-AES analysis results of the multi-component bismuth molybdate catalyst, it can be seen that the required amount of metal precursors was accurately co-precipitated, and the error was within...

preparation example 3

[0077] Zinc ferrite (ZnFe 2 O 4 ) Preparation of catalyst

[0078] Zinc chloride (ZnCl 2 ) as the zinc precursor, ferric chloride hexahydrate (FeCl 3 ·6H 2 O) as iron precursors. To prepare the zinc ferrite catalyst, 1.42 grams of zinc chloride and 5.61 grams of ferric chloride hexahydrate were dissolved in distilled water (100 ml) and stirred to form an aqueous precursor solution. After the precursor was completely dissolved, the aqueous solution of the precursor was added dropwise to distilled water (100ml), and at the same time, a 3M aqueous sodium hydroxide solution was added therein so that the pH of the co-precipitation solution was 9, thereby forming a mixed solution.

[0079] The mixed solution was sufficiently stirred with a magnetic stirrer at room temperature for 12 hours, and then left to stand at room temperature for 12 hours to perform phase separation, thereby precipitating the mixed solution. The precipitated mixed solution was filtered using a v...

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Abstract

The present invention relates to a method for preparing 1,3-butadiene by an oxidative dehydrogenation of normal butene through the use of a continuous-flow dual-bed reactor which is designed in such a manner that a fixed bed reactor thereof is filled with two types of catalysts and two catalyst layers are not physically mixed. More particularly, the present invention relates to a method for preparing 1,3-butadiene through an oxidative dehydrogenation of normal butene using a C4 mixture, as a reactant, containing normal butene and normal butane, by using a continuous-flow dual-bed reactor employing a multi-component bismuth molybdate-based catalyst and a ferrite-based catalyst which have activations different from one another for the oxidative dehydrogenation of the isomers (1-butene, trans-2-butene, cis-2-butene) of normal butene.

Description

technical field [0001] The invention relates to a method for preparing 1,3-butadiene using a twin-bed continuous flow reactor. More specifically, the present invention relates to a kind of preparation 1, the method for 3-butadiene, in this method multi-component bismuth molybdate catalyst and zinc ferrite catalyst are to n-butene in the oxidative hydrogenation reaction of n-butene Constructs (1-butene, trans-2-butene, cis-2-butene) show different reactivity, and then use the above catalyst to build a double-bed continuous flow reactor, so that the cheap The C4 mixture (including n-butane, n-butene, etc.) is used as a reactant to prepare high value-added 1,3-butadiene without additional steps of removing n-butane or purifying n-butene. Background technique [0002] Since 1,3-butadiene is used as an intermediate of petrochemical products in the petrochemical industry, the demand and value of it are gradually increasing worldwide. The preparation methods of 1,3-butadiene main...

Claims

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Application Information

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IPC IPC(8): C07C5/32
CPCC07C5/42C07C2523/80C07C2523/887C07C11/167C07C5/32C07C5/327
Inventor 郑英敏权容卓金泰禛李成俊金容升吴承勋宋仁奎金希洙郑智撤李镐元
Owner SK INNOVATION CO LTD
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