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Catalyst for preparing succinic anhydride from maleic anhydride through low-temperature hydrogenation and preparation method and application of catalyst

A technology for producing succinic anhydride and catalysts, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of large amount of precious metal usage, high reaction pressure, and increased cost, and achieve a wide range of solvent choices , mild reaction conditions, high hydrogenation activity and high selectivity

Inactive Publication Date: 2016-08-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this hydrogenation system, the use of precious metals is large, the reaction pressure is high and the energy consumption is high, resulting in increased costs

Method used

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  • Catalyst for preparing succinic anhydride from maleic anhydride through low-temperature hydrogenation and preparation method and application of catalyst
  • Catalyst for preparing succinic anhydride from maleic anhydride through low-temperature hydrogenation and preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take a certain amount of SiO 2 In the muffle furnace air atmosphere, the temperature was raised to 500 °C for 2 h at 20 °C / min, and then cooled to room temperature; 50 mmol / L chloropalladium acid aqueous solution and a certain amount of distilled water were weighed and impregnated on the above-mentioned roasted carrier, and the palladium loading was controlled as 1 wt%, the volume ratio of the carrier to the palladium solution was 1:4, ultrasonically dispersed for 2 h, and then dried in an oven at 80°C for 10 h; the hydrogen space velocity was 6000 ml / g / h under normal pressure for reduction treatment, the reduction process first The temperature was raised from room temperature to 120 °C at 5 °C / min and kept for 1 h, and then raised to 250 °C at 20 °C / min, then rapidly cooled to 200 °C and kept for 1 h, and then lowered to room temperature to obtain catalyst A. The ICP-AES test shows that the actual palladium loading is 0.97%, and the XRD and TEM characterization results...

Embodiment 2

[0023] Take a certain amount of Al 2 o 3 The preparation process of the carrier is roughly the same as that of Example 1, but during the reduction process, the temperature is raised to 250 °C at 20 °C / min and then kept for 0.5 h, and then rapidly lowered to 200 °C and kept for 1 h to obtain catalyst B.

Embodiment 3

[0025] Take a certain amount of activated carbon carrier and heat it up to 300°C for 2 h in a tube furnace nitrogen atmosphere at 5°C / min. The rest is the same as in Example 1 to obtain catalyst C.

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Abstract

The invention discloses a catalyst for preparing succinic anhydride from maleic anhydride through low-temperature hydrogenation and a preparation method and an application of the catalyst. The catalyst is a supported palladium catalyst having 0.25-1 wt% of palladium. The method comprises: loading an active palladium salt solvent on a pre-treated carrier through an impregnation process, performing drying, and reducing the obtained product with hydrogen to obtain a palladium catalyst. The catalyst is subjected to fine control and effective combination of carrier pretreatment, impregnation, and reduction, so that active palladium ingredients can be effectively dispersed on the support. The catalyst can be applied to the preparation of succinic anhydride from maleic anhydride through low-temperature liquid-phase hydrogenation. Under the pressure no more than 1 MPa and at the reaction temperature of 25-100 DEG C, the conversion rate of maleic anhydride can reach 100%, and the selectivity of succinic anhydride is no less than 99%. The catalyst is low in noble metal content and has advantages in cost, is high in activity of succinic anhydride production and good in selectivity, and has advantages of low temperature and pressure and wide solvent selection range. Low-temperature large-scale production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of heterogeneous catalytic hydrogenation, and in particular relates to a catalyst for producing succinic anhydride by low-temperature hydrogenation of maleic anhydride, a preparation method and application thereof. Background technique [0002] Succinic anhydride, also known as succinic anhydride, has the molecular formula C 4 h 4 o 3 , is an important raw material for organic synthesis, widely used in the synthesis of food processing aids, medicines, pesticides, esters and resins. At present, the main methods for producing succinic anhydride include succinic acid dehydration method and maleic anhydride catalytic hydrogenation method. Succinic acid dehydration method is that succinic acid is heated to 235°C (boiling point) in the presence of acetic anhydride, acetyl chloride, phosphorus oxychloride, phosphorus pentoxide, etc. to dehydrate to obtain succinic anhydride. The yield of succinic anhydride obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J29/44C07D307/60
Inventor 解晓伟范智豪孙长勇曹铭津盛广哲
Owner GUANGDONG UNIV OF TECH
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