特优级糠醛生产过程的计算机模拟及工业应用

针对我国糠醛产品纯度不高的现状，设计出适合于特优级糠醛产品生产分离的工艺流程，运用化工流程模拟软件Aspen Plus对糠醛精制过程进行计算机模拟优化。通过灵敏度分析得出最佳的操作参数为：一级分离塔理论板数20，进料位置第6~8块板，回流比5~6，二级分离塔理论板数25，进料位置第19~21块板，回流比1.4。同时，通过实验室小试装置对糠醛原料进行分离提纯，实验结果与模拟结果基本吻合，证实了非随机（局部）双液体模型（NRTL）可适用于糠醛物系。经济效益分析的结果表明，年产1万吨特优级产品的企业每年可以获得1181万元的经济效益，显著提高了企业的竞争力。

Computer simulation and industrial application in the distillation ultra pure furfural

Most of the furfural currently produced in China is of relatively low purity. Therefore we have designed a new process to produce high quality furfural. The chemical process simulation software Aspen Plus was used to simulate and optimize the furfural refining process. The effects of varying the plate number, reflux ratio and feed-stage on the sensitivity were studied. The optimal parameters of a two-column process for refining furfural were found to be:theoretical plates 20, feed stage 6~8 and reflux ratio in the range 5~6 for the first column, and theoretical plates 25, feed stage 19~21 and reflux ratio 1.4 for the second column. The distillation process was carried out in the laboratory using a small-scale device. The experimental results show that the non-random two-liquid (NRTL) model is suitable for the furfural system, because the separation results are consistent with the simulation results. According to an economic analysis, a factory with an annual output of 10 thousand tons will derive an economic benefit of 11.81 million yuan every year by using the new process and thus significantly improve their competitiveness in the market.