A method for preparing a catalyst for preparing pyromellitic dianhydride
By introducing ionic liquid modification during catalyst preparation, a low-vanadium, titanium-free homogeneous anhydride catalyst was prepared, solving the problem of uneven distribution of active components and achieving high-yield and low-pollution homogeneous anhydride production.
CN118080024BActive Publication Date: 2026-06-26PETROCHINA CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- PETROCHINA CO LTD
- Filing Date
- 2022-11-17
- Publication Date
- 2026-06-26
AI Technical Summary
Technical Problem
The uneven distribution of active components in the catalyst during the current homogenization anhydride production process leads to low homogenization anhydride yield and environmental pollution problems.
Method used
A catalyst was prepared by mixing vanadium source, alkaline earth metal compound and group VIB element compound using ionic liquid modification and spraying the mixture onto a support. The synergistic effect of active components and promoters was achieved through interionic forces, thus preparing a low-vanadium and titanium-free catalyst.
Benefits of technology
It improves the selectivity of the catalyst and the yield of anhydride, reduces environmental pollution, and significantly enhances the activity of the catalyst.
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Abstract
The application discloses a preparation method of a catalyst for preparing pyromellitic dianhydride, and comprises the following steps: S1, mixing a vanadium source, an ionic liquid and an auxiliary component to obtain a precursor, wherein the auxiliary component is an alkaline earth metal compound and / or a group VI B element compound; S2, heating and spraying the precursor onto a carrier to obtain the catalyst. In the application, the preparation of the catalyst adopts the method of introducing the ionic liquid for modification without destroying the main structure, meanwhile, the anion in the ionic liquid replaces the heteropoly acid containing metal elements, and through the action force between ions, the active component and the auxiliary component synergistically play their respective functions, so that the prepared catalyst is low in vanadium and titanium, the active component is uniformly distributed, the catalyst is high in purity and activity, and the selectivity of the catalyst and the yield of the phthalic anhydride are improved, and the catalyst is small in environmental pollution.
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