Manufacturing method of 2-heptanone
I. Introduction
2-heptanone is an important organic chemical raw material, which is widely used in the fields of medicine, pesticide, spice, solvent and so on. Therefore, it is of great significance to study the manufacturing method of 2-heptanone. In this paper, we will introduce the preparation of 2-heptanone by oxidation method using n-heptane as raw material.
II. Experimental Raw Materials and Equipment
1. Raw materials: n-heptane, sodium dichromate, sulfuric acid, sodium hydroxide
2. Equipment: reaction kettle, stirrer, thermostatic water bath, dispensing funnel, and distillation device
III. Experimental Steps
1. Add a certain amount of n-heptane to the reaction kettle, and then add sodium dichromate and sulfuric acid, and stir well.
2. Place the reaction kettle in a constant temperature water bath, control the temperature at 50-60°C and react for about 5-6 hours.
3. At the end of the reaction, pour the reaction solution into a separatory funnel, adjust the pH to neutral with sodium hydroxide solution and leave to stratify.
4. The organic layer was separated and washed with water until neutral, then distilled to collect the 2-heptanone fraction.
4. Experimental results and discussion
1. Experimental results: 2-heptanone was successfully prepared by oxidation method with high yield and purity of more than 98%.
2. Experimental Discussion: In the oxidation process, the amount of sodium dichromate, reaction temperature and time had a greater influence on the yield of 2-heptanone. Through experimental comparison, it was found that the yield of 2-heptanone was higher when the dosage of sodium dichromate was 10% of the mass of n-heptane, the reaction temperature was 50-60°C, and the reaction time was 5-6 hours. In addition, when adjusting the pH, the concentration and addition rate of sodium hydroxide solution need to be controlled in order to avoid localized over-base leading to the decomposition of 2-heptanone.
V.Conclusion
In this paper, 2-heptanone was prepared by oxidation method using n-heptane as raw material, and the experimental results showed that 2-heptanone could be produced with higher purity and yield under suitable conditions. The method is simple to operate, the raw material is easy to obtain, and it has a good prospect for industrialization. By studying the oxidation reaction under different conditions, it can provide reference for further optimizing the preparation process of 2-heptanone.
VI.Prospects and Suggestions
Although 2-heptanone was successfully prepared by oxidation in this paper, there are still many aspects that can be further studied and optimized. For example, the use of other oxidants or catalysts can be tried to improve the reaction efficiency and selectivity; the reaction mechanism can be investigated to provide a theoretical basis for the process optimization; and the treatment and recycling of wastewater can be examined to improve the environmental friendliness of the process. In addition, in order to better realize the industrial production, the selection of equipment, the design of process flow, safety and environmental protection need to be comprehensively considered and optimized.
In conclusion, as an important chemical raw material, the research on the preparation method of 2-heptanone is of great significance. By continuously optimizing the process conditions and improving the production efficiency, it is expected to provide a more economical and environmentally friendly preparation solution for the wide application of 2-heptanone.
