| CO_2低压溶剂羧化法合成2,6-二羟基苯甲酸工艺研究 |
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| 引用本文： | 唐蓉萍,韩庆荣. CO_2低压溶剂羧化法合成2,6-二羟基苯甲酸工艺研究[J]. 天然气化工, 2011, 36(5) |
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| 作者姓名： | 唐蓉萍 韩庆荣 |
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| 作者单位： | 1. 兰州石化职业技术学院,甘肃兰州,730060
2. 甘肃省化工研究院,甘肃兰州,730020 |
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| 摘 要： | 研究了间苯二酚低压溶剂羧化法合成2,6-二羟基苯甲酸。适宜的反应条件为:反应压力0.4MPa～0.5MPa反应温度140℃,反应时间6h~7h,n(间苯二酚)/n(氢氧化钾)=1/2.05,溶剂为甲苯。在适宜的条件下,产物经洗涤、酸化、脱色和重结晶等后处理工序,产品收率达70%,纯度大于99%(HPLC)。
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| 关 键 词： | 2,6-二羟基苯甲酸 合成 间苯二酚 二氧化碳 溶剂羧化 低压合成 |
Study on preparation of 2,6-dihydroxybenzoic acid by solvent carboxylation with CO2 under low pressure |
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| TANG Rong-Ping,HAN Qing-rong. Study on preparation of 2,6-dihydroxybenzoic acid by solvent carboxylation with CO2 under low pressure[J]. Natural Gas Chemical Industry, 2011, 36(5) |
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| Authors: | TANG Rong-Ping HAN Qing-rong |
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| Abstract: | Preparation of 2,6-dihydoxybenzoic acid by direct carboxylation of resorcinol with CO2 in solvent under low pressure was studied.The optimum reaction parameters were determined as follows: reaction pressure of 0.4-0.5MPa,reaction temperature of 140℃,reaction time of 6-7 hours,molar ratio of resorcinol to potassium hydroxide of 1:2.05 and toluene as solvent.Under the optimized conditions,after washing,acidification,decolorization and recrystallization,the yield of 2,6-dihydroxybenzoic acid could be up to 70% with the purity of more than 99 %(HPLC). |
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| Keywords: | 2,6-dihydroxybenzoic acid preparation resorcinol carbon dioxide solvent carboxylation low pressure synthesis |
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