Process for preparing dimethylbenzene by aromatization of methanol
A xylene and aromatization technology, applied in the production of hydrocarbons from oxygen-containing organic compounds, organic chemistry, bulk chemical production, etc., can solve the problems of low yield of carbon-based xylene in one pass
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Embodiment 1
[0015] Carry out aromatization reaction in fixed-bed reactor, catalyst is the ZSM-5 molecular sieve with Zn and P modification, and wherein Zn content is 3wt%, and P content is 5wt%; Feeding is the mixture of methanol and propylene, methanol and The mass ratio of propylene is 5; the reaction temperature is 450°C, the reaction pressure is 0.15MPa, and the weight space velocity is 1.5hr -1 . During the stable period of catalyst activity, the average yield of total aromatics was 64.25%, and the average yield of xylene was 34.20%.
Embodiment 2
[0017] Carry out aromatization reaction in one stage fluidized bed reactor, catalyzer is the ZSM-35 molecular sieve with Ga and Cu modification, and wherein Ga content is 5wt%, and Cu content is 1wt%; Feeding is the mixture of methanol and methane, The mass ratio of methanol to methane is 100; the reaction temperature is 650°C, the reaction pressure is 1MPa, and the weight space velocity is 1.0hr -1 . During the stable period of catalyst activity, the average yield of total aromatics was 60.32%, and the average yield of xylene was 31.25%.
Embodiment 3
[0019] The aromatization reaction is carried out in a fluidized bed reactor, the catalyst is ZSM-11 molecular sieve modified with Cr and Pt, wherein the Cr content is 5wt%, and the Pt content is 0.5wt%; the feed is a mixture of methanol and propane , the mass ratio of methanol to propane is 2; the reaction temperature is 650°C, the reaction pressure is 3MPa, and the weight space velocity is 1.2hr -1 . During the stable period of catalyst activity, the average yield of total aromatics was 62.32%, and the average yield of xylene was 32.15%.
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