废液晶显示器偏光片水热产乳酸研究

Lactic acid production from waste liquid crystal display polarizer under hydrothermal reaction conditions

以废液晶显示面板中的偏光片为原料,对其进行水热产乳酸研究,并考察了反应温度(250～375℃)、反应时间(1～11min)以及氧化剂(体积分数为30%的H2O2)投加量(0～1.0mL)对乳酸产率的影响。结果表明,反应温度、反应时间均会对偏光片水热产乳酸产生一定影响,乳酸产率随反应温度和反应时间的增加呈现先增加后减少的趋势,最佳水热条件为反应温度350℃,反应时间5min,此时乳酸产率达17%左右。投加氧化剂能显著提高乳酸的产率,在最佳水热条件下,氧化剂投加量为0.6mL时乳酸的产率可提高到21%。

Lactic acid production from waste liquid crystal display polarizer was carried out in batch reactors under the conditions of reaction temperature 250-375 ℃, reaction time 1 11 rain and oxidant （30% volume fraction of H2O2 ） dosage 0-1.0 mL. The effect of reaction temperature, time and oxidant volume on the yield of lactic acid was investigated. The results indicated that the reaction temperature and time had certain effect on lactic acid production. The yield of lactic acid was increased at first and then declined with the increasing of reaction temperature and time. The yield of lactic acid could be as high as 17 % under the optimum reaction temperature of 350℃and reaction time of 5 min. Adding oxidant could significantly increase the yield of lactic acid. When the dosage of oxidant was 0.6 mL, the yield of lactic acid was increased to 21%under the optimum hydrothermal reaction conditions.