Method for preparing gasoline rich in isoparaffin from methanol and/or dimethyl ether
A technology for isoparaffin and dimethyl ether, which is applied in the field of methanol and/or dimethyl ether to gasoline, can solve the problems of low single-pass yield of gasoline fraction hydrocarbons, non-compliance with environmental protection requirements and high content of aromatic olefins
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Embodiment 1
[0037] Prepare a 300mL solution with TBAOH and NaOH solution at a volume ratio of 2:3, add 9.0g HZSM-5 molecular sieve to the solution, treat it in a water bath at 65°C for 30min, filter and wash, and add the treated molecular sieve to 300mL NH4NO3 solution , treated in a water bath at 60°C for 1h, washed, filtered and dried, then calcined at 560°C for 4h to obtain a mesoporous HZSM-5 molecular sieve. Tablets are made into 20-40 mesh granules, and the hydrogen atmosphere is reduced at normal pressure for 4 hours, and used in the reaction of dehydration conversion of dimethyl ether to produce gasoline.
[0038] The catalyst loading is 0.5000g, the reaction temperature is 350°C, the reaction pressure is 1.5MPa, the carrier gas is hydrogen, the reaction gas flow rate is 25mL / min, and the molar ratio of hydrogen to dimethyl ether is 2. The results are shown in Table 3. Compared with Comparative Example 1, the selectivity of gasoline distillate hydrocarbons has increased to 79.3%,...
Embodiment 2
[0042] Weigh 0.5060g Ni(NO3)2·6H2O and dissolve it in 10mL water. Add 10.0g of HZSM-5 molecular sieve into the solution, impregnate for 24h, dry at 60°C for 10h, and roast at 560°C for 4h to obtain Ni-modified HZSM-5 molecular sieve. Tablets are made into 20-40 mesh particles, treated in a nitrogen atmosphere at normal pressure at 300°C for 4 hours, and used in the reaction of dehydration conversion of dimethyl ether to gasoline.
[0043]The catalyst loading is 0.5000g, the reaction temperature is 300-400°C, the reaction pressure is 1.5MPa, the carrier gas is hydrogen, the reaction gas flow rate is 25mL / min, and the molar ratio of hydrogen to dimethyl ether is 2. The results are shown in Table 4. With the increase of reaction temperature, the selectivity of gasoline distillate hydrocarbons and isoparaffins first increased and then decreased. It shows that the optimum reaction temperature of this reaction is about 350℃. If the reaction temperature is too low, the conversion ...
Embodiment 3
[0047] The Ni-modified ZSM-5 molecular sieve catalyst obtained in Example 2 was compressed into 20-40 mesh particles, and treated in a nitrogen atmosphere at 300° C. for 4 hours at normal pressure, and used in the reaction of dimethyl ether dehydration conversion to gasoline.
[0048] The catalyst loading is 0.5000g, the reaction temperature is 350°C, the reaction pressure is 1.5MPa, the carrier gas is hydrogen, the reaction gas space velocity is 1200-4800mL / g·h, and the molar ratio of hydrogen to dimethyl ether is 2. The results are shown in Table 5.
[0049] Table 5 Hydrogen as carrier gas Dimethyl ether conversion to produce gasoline rich in isoparaffins
[0050]
[0051]
[0052] It can be seen from Table 5 that with the increase of reaction space velocity, the selectivity of gasoline distillate hydrocarbons increases, while the selectivity of isoparaffins decreases. It shows that the reduction of residence time is beneficial to inhibit the occurrence of cracking re...
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