响应面法优化浓香型基酒重蒸馏工艺的研究

为提高基酒品质而优化重蒸馏工艺，以浓香型基酒为原料，将杂醇油分离效率作为评价指标，通过响应面试验设计对重蒸馏的温度、时间和压力进行优化。结果表明:基酒的最佳重蒸馏工艺条件为温度85.5 ℃，时间92.7 min，压力0.16 MPa，在此条件下，杂醇油分离效率可达89.31%。重蒸馏酒液的杂醇油含量较基酒和贮存2年的基酒显著降低（P<0.05），己酸乙酯、乳酸乙酯、乙酸乙酯、丁酸乙酯的四大酯比例在浓香型白酒的理想比例范围内，其风格保持不变而口感质量有所提升。因此，重蒸馏技术为快速实现基酒老熟提供了新的方法。

Optimization of Second Distillation Process of Nongxiang Cude Baijiu by Response Surface Methodology

In order to improve the quality of cude baijiu, the second distillation process was optimized. Cude baijiu of nongxiang baijiu was used as raw material, and the separation efficiency of fusel oil was taken as an evaluation index. The temperature, time and pressure of the second distillation were optimized by response surface design. The results showed that the optimum second distillation process conditions of cude baijiu were temperature 85.5 ℃, time 92.7 min and pressure 0.16 MPa. Under these conditions, the separation efficiency of fusel oil could reach 89.31%. Fusel oil content of second distillation baijiu was significantly lower than that of cude baijiu and cude baijiu stored for 2 years(P<0.05). The proportion of four esters in the second distillation baijiu was all within the ideal proportion of nongxiang baijiu of ethyl caproate, ethyl lactate, ethyl acetate and ethyl butyrate, its style remained unchanged, but the taste quality was improved. Therefore, the second distillation process technology provides a new method for rapid aging of cude baijiu.