从苯酐废料中提取马来酸并制备高纯度富马酸

On Extracting Maleic Acid from Benzene Anhydride Wastes and Preparing High-Purity Fumaric Acid

以苯酐废料为原料,采用升华的方法,从中提取出马来酸,并且将其制备成高纯度的白色透明针状晶体富马酸;同时,研究了反应温度和时间对高纯度富马酸产率的影响。实验结果表明,在设定的温度与时间内,富马酸的产率随着反应温度的升高或加热时间的延长而增大,且当反应温度为220℃,反应时间为20 min时,富马酸的产率最高,达88.8%。此外,采用液相色谱仪对产品的纯度进行了测定,结果表明采用升华法得到的产品的纯度高达99.99%;且产品的红外光谱图中,在925 cm-1位置处出现了反式烯烃的特征吸收峰,证实了产物为富马酸。最佳实验条件的验证结果表明,采用升华法从工业废料中生产富马酸,不仅产率较高,且实验重现性较好。

With phthalic anhydride wastes as raw material, adopts the method of sublimation to extract maleic acid and prepare high pure transparent white acicular crystal fumaric acid, and meanwhile studies the effects of the reaction temperature and time on the high-purity fumaric acid yield. The experimental results showed that： at the set temperature and time, the yield of fumaric acid increased with the reaction temperature or heating time increasing, and at the reaction temperature of 220 ℃ and the heating time for 20 min, obtained the highest fumaric acid yield of 88.8%. The product purity was determined by HPLC, the results show that the purity of the product is as high as 99.99%; and in the infrared spectra, the product appeared trans olefin characteristic absorption peak in the 925 cm-1 location and confirmed the product of fumaric acid. The experimental results at the best experiment condition show that： the preparation of fumaric acid from industrial wastes by sublimation method not only has higher yield but also has good experimental reproducibility.