A method for producing dimethyl ether by continuous catalytic distillation of methanol

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A method for producing dimethyl ether via continuous catalytic distillation of methanol; a method for producing dimethyl ether through the catalytic distillation dehydration of methanol, using cation exchange resin as a catalyst in a catalytic distillation tower to carry out the dehydration reaction of methanol； The operating conditions of the catalytic distillation column are as follows: the temperature in the middle of the reaction section is maintained at 80–200°C, the temperature at the top of the column is 10–110°C, the temperature at the bottom of the column is 130–260°C, the operating pressure is 0.3–4.0 MPa, the reflux ratio at the top of the column is 0.5–20, and the feed space velocity is 0.1–100 hours^-1. This invention enables an increase in the conversion rate and selectivity of methanol to dimethyl ether under lower temperature and pressure conditions, by employing catalytic distillation ； Under this law, methanol can be completely converted, **reducing equipment investment and operating costs, and thus lowering production expenses.