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Liquid-phase hydrogenation method for preparing 1, 5-pentanediol based on modified palladium supported catalyst

A supported catalyst and liquid-phase hydrogenation technology, which is applied in the preparation of hydroxyl compounds, the preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of severe process operation, high process operation temperature, and increased equipment investment, etc. Achieve the effect of lowering the hydrogenation reaction temperature, simple design and increase of production capacity, and reduced investment

Pending Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional 1,5-pentanediol preparation process, the process operation temperature is high, the pressure is high, the process operation is harsh, and the equipment requirements are high. The use of hydrogen cycle compressors increases the investment of the device

Method used

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  • Liquid-phase hydrogenation method for preparing 1, 5-pentanediol based on modified palladium supported catalyst
  • Liquid-phase hydrogenation method for preparing 1, 5-pentanediol based on modified palladium supported catalyst
  • Liquid-phase hydrogenation method for preparing 1, 5-pentanediol based on modified palladium supported catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation steps of the modified palladium-based supported catalyst in this example are as follows: first equip γ-Al 2 o 3 The sol was coated on the surface of 80g spherical activated carbon by 7 dipping methods, each dipping time was 10min, the dipping temperature was normal temperature, and the pressure was normal pressure. N 2 Calcined at 400°C for 6 hours in the atmosphere to obtain γ-Al 2 o 3 Activated carbon carrier coated with membrane, the weight ratio of alumina and activated carbon is 4:1;

[0041] Prepare a palladium nitrate aqueous solution with a concentration of 0.7mol / L and an ammonium metatungstate solution with a concentration of 0.8mol / L, and then use an equal volume impregnation method to place 100g of the above-prepared γ-Al 2 o 3 The membrane-coated activated carbon support was immersed in an aqueous palladium nitrate solution and an ammonium metatungstate solution for 5 hours at 20° C. to obtain a catalyst precursor. The catalyst precurs...

Embodiment 2

[0045] The preparation steps of the modified palladium-based supported catalyst in this example are as follows: first equip γ-Al 2 o 3 The sol was coated on the surface of 80g spherical activated carbon by 9 dipping methods, each dipping time was 15min, the dipping temperature was normal temperature, and the pressure was normal pressure. After filtering, it was first dried at 45°C for 4h, and then N 2 Calcined at 450°C for 5 hours in the atmosphere to obtain γ-Al 2 o 3 Membrane-coated activated carbon support, γ-Al 2 o 3 The weight ratio with activated carbon is 5:1;

[0046] Prepare a palladium nitrate aqueous solution with a concentration of 0.6mol / L and an ammonium metatungstate solution with a concentration of 0.5mol / L, and then use an equal volume impregnation method to place 100g of the above-prepared γ-Al 2 o 3 The membrane-coated activated carbon support was immersed in palladium nitrate aqueous solution and ammonium metatungstate solution at 40°C for 4 hours to...

Embodiment 3

[0051] The preparation steps of the modified palladium-based supported catalyst in this example are as follows: first equip γ-Al 2 o 3 The sol was coated on the surface of 80g spherical activated carbon by 10 dipping methods, each dipping time was 20min, the dipping temperature was normal temperature, and the pressure was normal pressure. in N 2 Calcined at 600°C for 6 hours in the atmosphere to obtain γ-Al 2 o 3 Membrane-coated activated carbon support, γ-Al 2 o 3 The weight ratio with activated carbon is 6:1.

[0052] Prepare a palladium nitrate aqueous solution with a concentration of 0.8mol / L and an ammonium metatungstate solution with a concentration of 0.9mol / L, and then use an equal volume impregnation method to place 100g of the above-prepared γ-Al 2 o 3 The membrane-coated activated carbon support was immersed in palladium nitrate aqueous solution and ammonium metatungstate solution for 6 hours at room temperature to obtain the catalyst precursor. The catalyst...

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Abstract

The invention provides a liquid-phase hydrogenation method for preparing 1, 5-pentanediol based on a modified palladium supported catalyst. According to the method, a two-step process is adopted, firstly, dimethyl glutarate is generated through an esterification reaction, and secondly, 1, 5-pentanediol is generated through liquid phase hydrogenation of dimethyl glutarate by adopting the modified palladium supported catalyst. According to the method, hydrogen required by the reaction is provided by liquid circulating material, the amount of hydrogen dissolved in a liquid far is much higher thanthe amount of hydrogen required in the reaction, and hydrogen exists in the active part of the catalyst, carbon deposition can be avoided after long-time operation, the influence of carbon depositionon the activity of the catalyst can be reduced, and the service life of the catalyst is effectively prolonged; meanwhile, a material passing through the reactor is a single liquid-phase material, andthe process is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of organic catalysis, and in particular relates to a method for preparing 1,5-pentanediol by liquid-phase hydrogenation based on a modified palladium-based supported catalyst. Background technique [0002] 1,5-Pentanediol is an important chemical raw material, which is widely used in the production of polyester, polyurethane, plasticizer, fragrance, synthetic lubricating oil, and disperse dye products. Due to the good performance and wide application of products developed with 1,5-pentanediol, countries all over the world are increasing their development efforts, especially as the world pays more and more attention to environmental protection, 1,5-pentanediol is used as Environmental protection products such as polyester hot melt adhesives and polyester adhesives produced from raw materials are more popular among people. At present, the direct hydrogenation method of glutaric acid and the hydrogenation meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J35/10C07C29/156C07C31/20
CPCB01J23/78C07C67/08C07C29/156B01J35/635B01J35/615C07C69/42C07C31/20
Inventor 常慧秦技强方玲叶军明陆鑫孙骏瞿卫国
Owner CHINA PETROLEUM & CHEM CORP
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