TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Catalysts : The alkali metal compound can be lithium or rubidium hydroborate, sodium or potassium borohydride, tetraboric acid lithium, sodium or dipotassium tetraborate, lithium, potassium, rubidium or soda perborate, sodium or potassium fluoborate, sodium or potassium metaborate, lithium, sodium, potassium or rubidium sulfate, lithium, potassium or sodium bisulfate, lithium, potassium, rubidium or sodium nitrate, mono or dibasic sodium phosphate, mono or bipotassium hydrogen phosphate, lithium, sodium, potassium or rubidium fluoride, lithium sodium, potassium or rubidium chloride, lithium sodium, potassium or rubidium bromide, lithium sodium, potassium or rubidium iodide, , sodium or potassium periodate, lithium sodium, potassium or rubidium carbonate, lithium sodium, potassium or rubidium bicarbonates, bisodium or potassium bicarbonate, lithium sodium, potassium or rubidium oxalate, lithium sodium, potassium or rubidium hydroxide, lithium sodium, potassium or rubidium methoxide, lithium sodium, potassium or rubidium formate, lithium sodium, potassium or rubidium acetate, lithium sodium, potassium or rubidium propionate, lithium sodium, potassium or rubidium butyrate, 2-methyl lithium, 2-methyl sodium, 2-methyl potassium or 2-methyl rubidium propionate, lithium sodium, potassium or rubidium valeric acid, 2-methyl lithium, 2-methyl sodium, 2-methyl potassium or 2-methyl rubidium butyrate, 3-methyl lithium, 3-methyl sodium, 3-methyl potassium or 3-methyl rubidium butyrate, 2,2-methyl lithium, 2,2-methyl sodium, 2,2-methyl potassium or 2,2-methyl rubidium propionate, lithium sodium, potassium or rubidium oxalic acid hydroxide, lithium sodium, potassium or rubidium oxalate, lithium sodium, potassium or rubidium malonic acid hydroxide, lithium sodium, potassium or rubidium malonic acid, lithium sodium, potassium or rubidium succinic acid hydroxide, lithium sodium, potassium or rubidium succinic acid, lithium sodium, potassium or rubidium tartaric acid hydroxide, lithium sodium, potassium or rubidium tartaric acid, lithium sodium, potassium or rubidium malic acid hydroxide, lithium sodium, potassium or rubidium malic acid, lithium sodium, potassium or rubidium citric acid bihydroxide, lithium sodium, potassium or rubidium citric acid, and lithium sodium, potassium or rubidium sorbic acid. Preferred Composition: The solid alkali catalyst is 1-8 8% of the weight of the tallow tree zinc oil. The rate scope of the methanol, or the alcohol or both is 1: 5 to 1: 20. Preferred Conditions: Reaction is carried out at 0-100 degrees C at 0.9 to 1.1 MPa for 1.5-10 hours.