Polymethoxy dimethyl ether synthesis process based on high-load acidic catalyst

By employing a one-step oxidative condensation reaction with a highly loaded acidic catalyst, and combining gradient acidic sites and oxidative active centers, the problems of lengthy processes and insufficient catalyst performance in existing processes are solved, achieving efficient and stable PODE3-6 synthesis, which is suitable for the clean fuel field.

CN122010699APending Publication Date: 2026-05-12YIWU JIAKUN NEW ENERGY CO LTD +1
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Patent Information

Application Number
CN202610128333.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-29
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing polyoxymethylene dimethyl ether synthesis processes suffer from problems such as lengthy processes, low production efficiency, insufficient catalyst performance, low product selectivity, poor structural stability, and high impurity content, making it difficult to meet industrialization requirements.

Method used

By employing a highly loaded acidic catalyst and a one-step oxidative condensation reaction, combined with the synergistic effect of gradient acidic sites and oxidative active centers, the chain growth process is directionally regulated. Mesoporous silica is used as a support to load molybdenum, vanadium, or tungsten oxide active centers, and SO3 deposition and dimethyldichlorosilane passivation treatment are used to form gradient acidic sites and nano-confined spaces, thus achieving efficient synthesis of PODE3-6.

Benefits of technology

It simplifies the synthesis process, improves production efficiency and product selectivity, extends catalyst life, reduces impurity content, enhances combustion performance and emission efficiency, and is suitable for high-altitude, low-oxygen environments.

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Abstract

The invention discloses a polyoxymethylene dimethyl ether synthesis process based on a high-load acidic catalyst, and belongs to the technical field of chemical production processes. The process comprises the following steps: by taking methanol or dimethyl ether as a raw material, carrying out molecular sieve dehydration pretreatment, carrying out one-step oxidative condensation in a fixed bed reactor by adopting a high-load acid catalyst, standing for liquid separation, carrying out double-tower rectification, carrying out molecular sieve dehydration and filtering by a filter membrane to finish product refining. Wherein a high-load acidic catalyst mesoporous silica is used as a carrier, a Mo-V / W composite oxidation active center is constructed, gradient acidic sites of strong acid in a pore channel-strong acid in a pore channel inlet / surface are matched, and the outer surface is subjected to hydrophobic passivation treatment, so that multifunctional synergistic catalysis is realized. According to the process, the traditional complex process is simplified, the selectivity and the product purity of the target product are greatly improved, the catalyst structure is stable, the service life is long, the obtained product meets the diesel oil mixing requirement, effective combustion supporting and emission reduction can be achieved under high altitude and other scenes, and the good industrial application prospect is achieved.
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