Method for preparing dimethyl ether by crude carbinol
A technology for dimethyl ether and crude methanol is applied in the field of preparing dimethyl ether to achieve the effects of preventing catalyst deactivation, improving yield and avoiding generation
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Embodiment 1
[0031] NH 4 -ZSM-5 (SiO 2 / Al 2 o 3 =30) Zeolite was added to 100ml of 0.1N NaCl solution, stirred at 80°C for 24 hours, filtered, washed with distilled water, dried at 120°C for 12 hours, and then calcined at 500°C for 12 hours to obtain NaH-ZSM-5 (Na ion exchange rate=44 mol%).
[0032] In the granulator, shape the obtained NaH type zeolite into 60-80 mesh, take 2.5ml of such catalyst, and then add it into the fixed-bed reactor. Nitrogen gas was then introduced at a rate of 50 ml / min while adjusting the temperature of the reactor to 270°C. Methanol with 30 mol% water at LHSV of 5.5h -1 The rate is passed through the catalyst bed, during which the reactor is maintained at 1 atm and 270°C. The results are shown in Table I.
Embodiment 2
[0034] The catalyst used was the same as that in Example 1, except that a 0.5N NaCl solution (Na ion exchange rate = 78 mol%) was used in the preparation of NaH type ZSM-5. Methanol dehydration was then carried out as in Example 1. The results are shown in Table I.
Embodiment 3
[0036] NH 4 - Beta zeolite was added to 100 ml of 1N NaCl solution, stirred at 80°C for 24 hours, filtered, washed with distilled water, and dried at 120°C for 12 hours. The product was added again to 100 ml of 1N NaCl solution, ion-exchanged, filtered, washed, dried as described above, and then calcined at 500° C. for 12 hours to obtain NaH type beta zeolite (Na ion exchange rate=88 mol%).
[0037] Then, methanol dehydration was carried out as in Example 1. The results are shown in Table I.
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