二甘醇或乙二醇连续催化合成1，4－二氧六环

采用连续法合成１，４ 二氧六环。以二甘醇为原料，温度２４０℃，催化剂初始浓度：硅钼酸３％，或硫酸铁３％，或硅钨酸银２％；连续补加浓度：硅钼酸１％，硫酸铁１％，硅钨酸银０５％；以乙二醇为原料，温度１９０℃，催化剂初始浓度：硅钼酸４％，或硫酸铁３５％，或硅钨酸银２％；补加浓度：硅钼酸１５％，硫酸铁１５％，硅钨酸银１％；控制塔顶温度为９５～１０５℃，反应速度快，产率较高。

CONTINUOUS CATALYSIZING SYNTHESIS OF 1,4 DIOXANE WITH DIETHYLENE GLYCOL OR GLYCOL

The continuous catalysizing synthesis of 1,4 dioxane has been studied. The experiment results show that the reacting speed is quicker and the yield of 1,4 dioxane is higher under the following conditions. When diethylene glycol is used as raw material, the reacting condition is that the temperature is 240℃, the initial concentration of catalyst is 3% 12 molybdosilicic acid (3% ferric sulfate or 2% silver 12 tungstosilicate), the coutinuous added concentration of catalyst is 1% 12 molybdosilicic acid (1% ferric sulfate or 0.5% silver 12 tungstosilicate). When glycol is used as raw material, the reacting condition is that the temperature is 190℃, the initial concentration of catalyst is 4% 12 molybdosilicic acid (3.5% ferric sulfate or 2% silver 12 tungstosilicate), the continuous added concentration of catalyst is 1.5% 12 molybdosilicic acid (1.5% ferric sulfate or 1% silver 12 tungstosilicate). The temperature of the top of the controlling tower is 95～105℃.