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[Chemical Knowledge]：GBL production and manufacturing methods and processes.

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1. Introduction

γ-butyrolactone (GBL) is an important raw material for chemical production, which is widely used in medicine, pesticide, plastic, fiber and other fields. With the continuous progress of science and technology, the manufacturing method of GBL has been continuously developed and optimized. This article will introduce a common GBL manufacturing method.

2. Materials and Methods

2.1 Materials

The raw materials required for this experiment are succinic acid, methanol and sodium hydroxide.

2.2 equipment

experimental equipment including reaction kettle, stirrer, thermometer, condenser, water separator, etc.

2.3 manufacturing method

add succinic acid and methanol into a reaction kettle according to a certain molar ratio, stir and heat to a certain temperature, then slowly add sodium hydroxide solution, control the reaction temperature within a certain range, and after a certain reaction time, carry out distillation separation to obtain GBL product.

3. Results and Discussion

3.1 the effect of reaction temperature

In the experiment, we found that the reaction temperature has a great influence on the yield of GBL. When the reaction temperature is low, the reaction rate is slow and the yield is low; when the reaction temperature is high, although the reaction rate is accelerated, more by-products will be produced, which will affect the purity of GBL. Therefore, selecting the appropriate reaction temperature is the key to ensure the yield and purity.

3.2 the influence of raw material ratio of

raw material ratio is also an important factor affecting the yield of GBL. When the molar ratio of succinic acid to methanol is too low, it will lead to excessive methanol and increase the production cost; when the molar ratio is too high, it will lead to excessive succinic acid and affect the purity of GBL. Therefore, choosing the appropriate ratio of raw materials is also the key to improve the yield and purity.

3.3 product purity detection

By using high performance liquid chromatography and other analytical methods, we have tested the purity of GBL products. The results show that the GBL products obtained by the above manufacturing methods have high purity and meet the requirements of industrial production.

4. Conclusion

This article introduces a common GBL manufacturing method, and the feasibility of this method is verified by experiments. The experimental results show that the selection of appropriate reaction temperature and raw material ratio is the key to improve the yield and purity of GBL. At the same time, the purity of GBL products can be effectively detected by high performance liquid chromatography and other analytical methods. The method has the advantages of simple operation, easy availability of raw materials and low cost, and is suitable for industrial production.

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