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Comparison of four major differences between three kinds of extraction equipment for chemical synthesis, extraction and washing (including water washing and alkali washing)

In the field of fine chemicals, during the synthesis of azapentyl alcohol nitrate compounds, there are generally extraction and washing (including water washing and alkali washing) processes, the main purpose of which is to remove the solvent and by-products in the nitroazide compound reaction solution Sodium salt etc. At present, these two processes still rely on the traditional tank-type stirring, and then stand still to complete the separation. There are problems such as low separation efficiency and long standstill time, which greatly affects the post-processing unit, resulting in low automation of the preparation of such compounds. The long cycle, large amount of waste water and high direct cost limit the improvement of manufacturing level.

Liquid–Liquid Centrifugal extraction technology realizes the contact mass transfer and phase separation of liquid-liquid two-phase with the help of centrifugal force field. It has the characteristics of compact structure, large processing capacity, stable operation, low power consumption, and convenient cleaning and maintenance. In the LXC centrifugal extractor, the light and heavy two-phase solution enters the annulus-type mixing zone formed between the drum and the shell from the two feed nozzles in a certain proportion, and passes through the turbine disc and the shell with the help of the rotation of the drum. The impeller makes the two phases mix and disperse quickly, and the two-phase solution is fully mass-transferred. Complete the mixed mass transfer process. The stratification of the extract phase and the raffinate phase is completed in the high-speed rotating inner cylinder and separated by the control weir system. The two processes of mixing mass transfer and separation and clarification are realized in one device. Since the advent of the centrifugal extractor, it has developed rapidly. Many countries have widely used it in the fields of pharmacy, metallurgy, wastewater treatment, petrochemical industry, and nuclear fuel post-treatment. There is a high application prospect in the field of material chemical industry.

Compared with traditional liquid liquid extraction equipment such as extraction towers and mixing and settling tanks, Prosea series centrifugal extraction technology has obvious advantages in volumetric efficiency, retention capacity, mass transfer efficiency, residence time, etc.:
1. Among the three types of equipment, the volumetric efficiency of the centrifugal extractor is the largest, generally reaching 30 to 50 times that of the mixing and settling tank;
2. In terms of equipment storage and flow rate, due to the strong phase separation ability of the centrifugal extractor, under the same output requirements, the centrifugal extractor is much smaller than the mixing and settling tank and the extraction tower;
3. In terms of mass transfer efficiency, the stage efficiency of centrifugal extractors is very high, generally reaching over 99%, while axial back-mixing is easy to occur in the extraction tower, resulting in low mass transfer efficiency;
4. From the perspective of residence time, the centrifugal extractor is the shortest among the three extraction equipments, and generally can be controlled within a few seconds to tens of seconds.

According to reports, azapentyl alcohol nitrate, etc., is a new type of liquid azidation reaction product with great application prospects. It has the advantages of high energy, high burning rate, low burning temperature, small relative molecular weight of gas, and large gas production. It can be used in the development of propellant formula and propellant, etc. The synthesis process of such compounds usually includes azidation, extraction, washing, decolorization, filtration and vacuum distillation.

The new continuous liquid liquid centrifugal extraction + washing process transforms the original intermittent extraction operation into a continuous process, which not only greatly improves the automation of the synthesis and manufacture of azapentyl nitrate, but also greatly improves the separation efficiency and reduces the The production cost reduces waste water discharge, which is conducive to the improvement of chemical production level. At the same time, it can also meet the future development needs of weapons and equipment.