The Research And Simulation Optimization About The Process Of Using Hydrogen Peroxide To Produce Hydrazine Hydrate

Hydrazine hydrate is a widely used chemical which could be applied in synthesis of pesticide, pharmaceutical, foaming agent, fuel and reductant.At present, the production process of hydrazine hydrate in China is suffering from the high energy consumption, low raw material reutilization rate and environmental pollution. The blockade of the advanced process resulted in the utilization of techniques which have been obsoleted by the foreign companies. Among the processes currently employed, hydrogen peroxide method is found to be environmental friendly and economical. Researches and optimization on this process are important to change the status quo of hydrazine hydrate industry in China.In this dissertation, the manufacturing process was improved by the Aspen Plus simulation software to determine the parameters of this process. All the optimization was conducted in order to guarantee the character of energy conservation and environmental protection.(1) An appropriate model was selected. NRTL model which has strong applicability and can calculate the liquid-liquid layered system was chosen through analysis and physical property return. The simulation data and experimental results were consistent. The model was proved to be effective.(2) The synthesis section of methyl ethyl ketazine was designed. The recovery of ammonia and the synthesis and purification of methyl ethyl ketazine could be conducted under atmospheric pressure.(3) The separation program was optimized. Dividing wall columns could promote the removal of impurities and cut the cost. The molar ratio of impurities to butanone collected from the top of the column was 0.023<0.03. After the optimization, the reduction of expenses on equipments, operating and the total was 47.2%,22.8% and 24.6%, respectively. The theoretical plate number of main tower was 42. The theoretical plate number of deputy tower was 14. The feed position was 13 boards. The reflux ratio was 7. The operation pressure was 0.101MPa.(4) The hydrolysis section of methyl ethyl ketazine was designed. Strand feeding was more rational than single strand feeding in the reaction distillation process. Reactive distillation column model was adopted in this dissertation. The theoretical plate number was 25. The feed position was 4. The mole ratio of water to methyl ethyl ketazine was 9:1. The conversion of methyl ethyl ketazine was 99.99%. The top hydrazine mass fraction was 29.30%. The mass fraction of butanone from the reactive distillation column was 99.06%. The water content was close to 0.94%. The impurity content was less than 0.01%. Therefore, the butanone solution could be recycled.Hydrogen peroxide process is an advanced, environmentally friendly and energy conservation method. The study of the synthesis, purification and catalytic hydrolysis process of methyl ethyl ketazine was significant and could promote the development of hydrazine hydrate industrial in China.