The Research Of Extractants Of 1,3-Butadiene Extraction

1,3-Butadiene is an important chemical organic raw materials in the petochiemical filed.The major method for production 1,3-butadiene is extractive distillation in industry. Common solvent for extractive distillation are acetonitrile, dimethylformamide, N-methyl pyrrolidone. Organic Synthesis Plant of Jilin Petrochemical Company of 1,3-butadiene of unit by extractive distillation with acetonitrile 1,3-Butadiene production. The unit as the first extractive distillation column operating temperatures are high, the polymerization of 1,3-butadiene serious, leading to 1,3-butadiene yield is very low, the 1,3-butadiene of unit higher energy consumption. Thus reducing the operating temperature of the first extractive distillation column tower, reducing the loss of 1,3-butadiene has become an urgent task for the 1,3-butadiene of unit.In this paper, the first of extraction distillation process with acetonitrile is simulated with the software of Aspen plus. Established a theoretical model of the actual equipment factory. Extractive According to performance of requirements distillation solvent, choose a high polarity, smaller volatility,low vapor pressure as a second extraction add in solvent acetonitrile. The theoretical model by adding acetonitrile, this solvent extraction performance, the addition of a suitable solvent selected. The second model added by the mass fraction of the solvent extraction tower with a tower reactor operating temperature and the relationship between the yield of 1,3-butadiene, initially to determine the concentration of this solvent. After the solvent on the screening experiment, compared with the blank experiment to add a second solvent extraction column of a reactor temperature and changes in the yield of butadiene, a stripping tower to determine reactor can reduce the temperature of 3-8℃, butadiene closerate was 98.5% of the solvent. Extractive distillation solvent stability experiments conducted to determine the stability of the solvent.After the extraction of the extraction solvent recovery testing laboratory to determine the recovery of solvent and solvent have the same properties of the original. The concentration of second solvent added to the optimized industrial application is proposed recommendations.