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Ionic liquid 2-(1-imidazolyl)-supported acetate catalyst and preparation method thereof

An ionic liquid and imidazole-based technology, which is applied in the field of acetate metal catalysts and its preparation, can solve the problems of inconvenient and difficult reaction rate, difficult control of reaction selectivity, etc.

Inactive Publication Date: 2013-10-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, metal carboxylate catalysts such as palladium acetate and copper acetate are effective in hydrogenation reduction, oxidative dehydrogenation, catalytic reforming, cracking, hydrodesulfurization, reductive amination, telomerization, coupling, disproportionation, ring expansion, cyclization, carbonyl However, in these reactions, the catalytic activity of acetate-based metal catalysts is fixed, the reaction rate is inconvenient to be regulated by the catalyst, and the selectivity of the reaction is not easy. regulation, and it is not easy to reduce the generation of side reactions by regulating the catalyst
In addition, catalysts such as palladium acetate do not have good water solubility like copper acetate, and it is insoluble in water, so it is difficult to reclaim it; By-products) often remain in the scrap during rectification, and this part of by-products is mixed with palladium acetate, and it is quite difficult to extract palladium acetate from it

Method used

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  • Ionic liquid 2-(1-imidazolyl)-supported acetate catalyst and preparation method thereof
  • Ionic liquid 2-(1-imidazolyl)-supported acetate catalyst and preparation method thereof
  • Ionic liquid 2-(1-imidazolyl)-supported acetate catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 12.61g (0.1mol) 2-(1-imidazolyl) acetic acid and 12ml deionized water into a 50ml eggplant-shaped bottle, add 21.4g 36%wt HCl solution, stir at 50°C for 5 hours, evaporate under reduced pressure water, and dried in a vacuum oven at 80°C to obtain 15.2 g of imidazole acetate hydrochloride [min][Cl] (yield 93.5%).

Embodiment 2～6

[0026] The method is similar to Example 1, using different strong acids to obtain [min][X] of different anions, the results are shown in Table 1:

[0027] Table 1

[0028]

[0029] The product element analysis result of embodiment 1~6 is shown in Table 2:

[0030] Table 2

[0031]

[0032]

Embodiment 7

[0034] Get the ionic liquid product [min] [Cl] 5.03g (0.03mol) that embodiment 1 prepares, put into 250ml eggplant-shaped bottle, add 50ml deionized water and 3.0g (about 0.015mol) copper acetate monohydrate, often Stir under high pressure to react and distill. When it is detected that the water phase is substantially free of acetic acid (pH=6~7), the distillation is stopped, the water is distilled off under reduced pressure, and the vacuum oven is dried at 80°C to obtain [min][Cl]-Cu 4.81g, the yield 83%, its infrared spectrum see figure 1 .

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Abstract

The invention discloses an ionic liquid 2-(1-imidazolyl)-supported lead, cobaltous, nickle, copper or manganese acetate catalyst. The catalyst can be dissolved in a conventional organic solvent and also has good solubility in water and the solubility of the catalyst in water is commonly greater than that of the catalyst in the organic solvent. Therefore, in the reaction process, the ionic liquid 2-(1-imidazolyl)-supported acetate catalyst can be well dissolved in a reaction system and can be removed from the reaction system by a simple washing method after the reaction is completed; and then moisture in the catalyst is evaporated under the decompression condition so as to fulfill the aim of recovering the catalyst. Moreover, the ionic liquid 2-(1-imidazolyl)-supported acetate catalyst consists of rich anions and cations and various approaches are provided for regulating and controlling the performance of the catalyst. The invention further discloses a preparation method of the ionic liquid 2-(1-imidazolyl)-supported acetate catalyst.

Description

technical field [0001] The invention relates to a kind of acetate metal catalyst supported by ionic liquid 2-(1-imidazolyl) and a preparation method thereof. Background technique [0002] As we all know, metal carboxylate catalysts such as palladium acetate and copper acetate are effective in hydrogenation reduction, oxidative dehydrogenation, catalytic reforming, cracking, hydrodesulfurization, reductive amination, telomerization, coupling, disproportionation, ring expansion, cyclization, carbonyl However, in these reactions, the catalytic activity of acetate-based metal catalysts is fixed, the reaction rate is inconvenient to be regulated by the catalyst, and the selectivity of the reaction is not easy. It is not easy to reduce the generation of side reactions by regulating the catalyst. In addition, catalysts such as palladium acetate do not have good water solubility like copper acetate, and it is insoluble in water, and it is difficult to reclaim it; By-product) often...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/12C07D303/04C07D301/12C07C35/08C07C29/48
Inventor 胡兴邦杨国强吴有庭张志炳
Owner NANJING UNIV
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