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对伞花烃裂解氧化产物苯甲酸与硫酸二甲酯的反应可以采用水相酯化法。实验室小试结果显示,苯甲酸的转化率平均为89.97%,苯甲酸甲酯的得率平均为83.16%;车间放大试验结果显示,苯甲酸甲酯的得率为89.00%。水相酯化法与有机相酯化法相比,甲苯的单耗降低38.69%,硫酸二甲酯的单耗下降32.14%,废水量下降35.85%,耗时减少66.67%,设备利用率和生产能力显著提高,氧化催化剂也可以得到回收。 相似文献
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通过改进的氰化酯化法制备丙二酸二甲酯的实验研究,探索提高丙二酸二甲酯收率的因素及其最佳工艺的参数。实验着重分析研究了氰化过程中的pH值、反应时间和反应温度;酯化反应过程中酸化液的水分含量、甲醇和氯乙酸的摩尔比、反应时间等过程因素对制备丙二酸二甲酯收率的影响。实验结果显示,改进的氰化酯化法制备的丙二酸二甲酯收率达到了85%以上,产品纯度在99%以上。 相似文献
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稀土硫酸盐催化合成乳酸正丁酯 总被引:30,自引:0,他引:30
研究了稀土硫酸盐催化乳酸与正丁醇的酯化反应,探讨了催化剂用量、酸醇摩尔比和反应时间对酯化反应的影响。适宜条件下,酯产率可达85%以上。 相似文献
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八面沸石在精细有机合成中催化作用的研究:XⅡ脱铝USY催化己酸与烯丙… 总被引:2,自引:0,他引:2
研究了脱铝超稳Y催化己酸与烯丙醇直接酯化反应,考察了催化剂硅铝化,催化剂用量,反应物配比,反应时间及脱水剂对酯化反应的影响,结果表明,在最适宜的反应条件下,酯化率在97%以上,该催化剂亦能用于丁酸,乙酸与烯丙醇以及己酸与异丙醇的酯化反应。 相似文献
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脱铝超稳Y沸石催化合成乳酸正丁酯 总被引:9,自引:0,他引:9
研究了脱铝超稳Y沸石催化乳酸与正丁醇的酯化反应,考察了催化剂硅铝化、催化剂用量、反应物配比和反应时间对酯化反应的影响。结果表明,在优惠反应条件下,反应在1 h内完成,酯收率达74%以上,催化剂可重复使用。 相似文献
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针对水杨酸与异丙醇的分子结构特点、进行选择催化剂并研制出催化活性较高的MA型催化剂及酯化新工艺,酯化单程收率90%以上。 相似文献
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A study was made of the dehydrogenation of n-butane over a commercial chromia-alumina catalyst. Dehydrogenation runs were performed at 500°C. and space velocity of 34,000 hr?1 over a range of butane partial pressures from 0.06 to 1.80 atm. Conversions were differential, averaging about 3% (with a maximum of 6% ) of the input butane. Reaction was found to be 0.75 order in butane partial pressure. Thermodynamic equilibrium was attained among the products, which were 1-butene, cis-2-butene, and trans-2-butene. The method of Yang and Hougen showed dehydrogenation to be surface reaction controlled at a confidence level of 91%. This conclusion agrees with that of a previous study by Dodd and Watson. 相似文献
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Experiments were performed to investigate the boundary layer flow over rough surfaces of sawn boards in a lumber drying stack. The measurements were conducted with hot-wire anemometry in a range of free-stream velocities of from 0.6 to 7.0 m/ over the rough surface of sawn boards. Boundary layer properties were calculated to demonstrate the development and structure of the flow for various free-stream velocities. The effect of the boundary layer flaw on the drying of lumber was discussed. 相似文献
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ABSTRACT Experiments were performed to investigate the boundary layer flow over rough surfaces of sawn boards in a lumber drying stack. The measurements were conducted with hot-wire anemometry in a range of free-stream velocities of from 0.6 to 7.0 m/ over the rough surface of sawn boards. Boundary layer properties were calculated to demonstrate the development and structure of the flow for various free-stream velocities. The effect of the boundary layer flaw on the drying of lumber was discussed. 相似文献
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絮凝—电解法处理麻黄素废水研究 总被引:10,自引:2,他引:8
本文探讨了用絮凝-电解法联用处理麻黄素废水,研究了絮凝剂种类,用量,体系PH值及电极材料,槽电压对处理结果的影响,实验表明,用絮凝-电解法联用处理麻黄素废水可使其透光度达995以上,COD下降95%。 相似文献