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目的:观察温度、溶媒及稳定剂对过氧乙酸稳定性的影响。方法:测定过氧乙酸在不同温度,不同电导率的水(自来水、纯净水、蒸馏水)作为稀释溶媒,及用不同稳定剂(3g·L-1枸椽酸、2g·L-1水杨酸、2.5g·L-1苯甲酸、70%乙醇、4g·L-1磷酸)时的含量变化。结果:稀过氧乙酸比浓过氧乙酸更易分解,且贮存温度越高,分解越快。用不同电导率的水(自来水、纯净水、蒸馏水)稀释后,其下降速度常数k值分别为1.690,1.009,0.630。分别加入5种稳定剂后过氧乙酸的下降速度常数分别为0.132,0.139,0.147,0.176,0.165。结论:过氧乙酸溶液应贮存在阴凉处,以减少其分解。稀释溶媒的电导率越大,分解越快。5种稳定剂对过氧乙酸稳定性结果为枸椽酸>水杨酸>苯甲酸>磷酸>乙醇。
Objective: To observe the effects of temperature, solvent and stabilizer on the stability of peracetic acid. Methods: Peracetic acid was measured at different temperatures and different conductivities (tap water, purified water and distilled water) as diluting solvent and different stabilizers (3 g · L -1 citric acid, 2 g · L -1 salicylic acid , 2.5 g · L -1 benzoic acid, 70% ethanol, 4 g · L -1 phosphoric acid). Results: Dilute peroxyacetic acid is more soluble than peroxyacetic acid and the higher the storage temperature, the faster the decomposition. With different conductivity of water (tap water, purified water, distilled water) diluted, the rate of decline of its constant k values were 1.690,1.009,0.630. After the addition of five kinds of stabilizers, the decay rate constant of peracetic acid were 0.132,0.139,0.147,0.176,0.165 respectively. Conclusion: Peracetic acid solution should be stored in a cool place to reduce its decomposition. The greater the conductivity of the diluted solvent, the faster the decomposition. The results of five kinds of stabilizers on peracetic acid stability were citric acid> salicylic acid> benzoic acid> phosphoric acid> ethanol.