Method for producing 1,2,3-trimethylbenzene from coal-based raw materials
A technology based on trimethylbenzene and coal, which is applied in the field of production of trimethylbenzene, can solve the problem of insufficient operating rate of the device, and achieve the effect of eliminating the separation and purification process of raw materials and high target product selectivity
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[0020]Example 1:
[0021]figure 1Shown is the process flow diagram of the method for producing meta-trimethylbenzene from coal-based raw materials in the present invention. Coal-based raw material production method of trimethylbenzene, crude methanol (80.0%), coking crude benzene (containing 90.4wt% benzene, 8.0wt% toluene, 1.5wt% xylene and 0.1wt% other impurities) produced from coal synthesis gas As raw materials, among which the coking crude benzene is washed with sulfuric acid and hydrogenated pretreatment (NiO-MoO3And Co-MoO3After the catalyst (fixed bed), it enters the alkylation reactor (fluidized bed) with crude methanol for catalytic reaction, and the products obtained are mainly trimethylbenzene, toluene, mixed xylene, a small amount of recombinant aromatics and light hydrocarbons. They enter the rectification system with unreacted benzene, and then pass through the gas stripper, benzene+toluene+xylene (BTX) separation system, the separated light hydrocarbons are used as plan...
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[0023]Example 2:
[0024]Based on Example 1, the difference from Example 1 is:
[0025]The raw material of coal-based methanol is crude methanol (methanol content 93.0wt%) made from coal coke oven gas. Coal-based benzene is a mixture of coking crude benzene and coal tar heavy component lightweight crude benzene, which contains 79.8% by weight of benzene, 15.0% by weight of toluene, 5.0% by weight of xylene and 0.2% by weight of other impurities. The alkylation reactor adopts a fixed bed reactor. The catalyst used in the alkylation reaction is a sheet-shaped MCM-56 / nano Beta composite molecular sieve modified with 0.04% CuO and 0.1% CaO, with an external specific surface area of 93m2 / g, the number of external surface acid sites accounted for 32% of the total acid sites, and the number of weak acid and medium strong acid sites accounted for 98.1% of the total acid sites. The alkylation reaction conditions are: the molar ratio of methanol to aromatics (BTX) is 1:1, the reaction pressure is...
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[0026]Example 3:
[0027]Based on Example 1, the difference from Example 1 is:
[0028]Coal-based benzene raw material uses coking crude benzene, which contains 99.19wt% benzene, 0.6wt% toluene, 0.2wt% xylene and 0.01wt% other impurities; coal-based methanol is made of crude toluene produced by coal synthesis gas and coal coke oven gas A mixture of crude methanol containing 84.1 wt% methanol; the alkylation reactor uses a moving bed reactor. The catalyst used in the alkylation reaction is a nano-needle-shaped ZSM-5 / sheet-shaped MCM-49 composite molecular sieve modified with 5.0% CdO and 5.0% MgO, with an external specific surface area of 99m2 / g, the number of external surface acid sites accounted for 36% of the total acid sites, and the number of weak acid and medium strong acid sites accounted for 97.1% of the total acid sites. The alkylation reaction conditions are: the molar ratio of methanol to aromatics (BTX) is 1:2, the reaction pressure is 5.0MPa, the reaction temperature is 700℃...
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