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[Chemical Knowledge]：Production and manufacturing method and process flow of p-toluic acid

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The manufacturing method
of p-methyl benzoic acid
1. Introduction

p-methyl benzoic acid (p-Toluic acid) is an important chemical raw material, widely used in medicine, pesticides, dyes and other fields. In this paper, the manufacturing method of methyl benzoic acid is discussed in order to provide an efficient and feasible production method.

2. Materials and Methods

1. Material

The preparation of p-toluic acid requires the following raw materials: toluene, potassium permanganate, sulfuric acid, and sodium hydroxide.

2. Equipment
The equipment required for the
experiment includes: three-necked flask, constant pressure dropping funnel, thermometer, reflux condenser, magnetic stirrer, etc.

3. Preparation Method

(1) Oxidation
of Toluene
A certain amount of toluene was added into a three-necked flask, then potassium permanganate and sulfuric acid were slowly added, the reaction temperature was controlled at 60-70 ° C., and stirring was continued during the reaction. After completion of the reaction, the reaction solution was poured into ice water to precipitate a solid substance, which was filtered to obtain a crude product.

(2) Acidification of the crude product

adding the crude product to a sulfuric acid solution of a certain concentration, heating to boiling, and holding time. After cooling to room temperature, the insoluble material was removed by filtration to obtain an acidified solution.

(3) Crystallization Purification

Add an appropriate amount of sodium hydroxide solution to the acidified solution, adjust the pH value to neutral, and then heat to boiling, so that p-toluic acid crystals are precipitated. After cooling to room temperature, the pure p-toluic acid was obtained by filtration.

3. Results and Discussion

1. Results

Through the preparation experiment of p-toluic acid, we have obtained pure p-toluic acid with high yield.

2. Discussion

In the preparation process, we need to pay attention to control the reaction temperature and pH value to ensure the smooth progress of the reaction and the purity of the product. In addition, in order to improve the yield, we can optimize the reaction conditions, such as adjusting the amount of potassium permanganate and sulfuric acid, reaction time, etc.

4. conclusion

This paper provides a feasible method for the preparation of p-toluic acid, which is verified by experiments. This provides a certain reference value for the industrial production of p-toluic acid.

5. prospects and recommendations

Although this article provides an effective method for the preparation of p-toluic acid, there are still many aspects that can be further studied and improved. For example, more environmentally friendly and efficient oxidants and catalysts can be explored to reduce production costs and environmental pollution; the effects of different crystallization conditions on product purity can be studied to further optimize the crystallization process; the application of p-toluic acid can be carried out to expand Its application in medicine, pesticides, dyes and other fields. In order to better promote the production and application development of p-toluic acid,

suggested that relevant departments and enterprises should increase investment, strengthen industry-university-research cooperation, and continuously improve the production process and technical level. At the same time, we should strengthen the awareness of environmental protection, promote green production, ensure that the production of p-toluic acid meets the requirements of environmental protection, and contribute to the realization of sustainable development.

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