Manufacturing method of p-Toluic acid
I. Introduction
p-Toluic acid (p-Toluic acid) is an important chemical raw material, which is widely used in the fields of pharmaceuticals, pesticides, dyes and so on. In this paper, the manufacturing method of p-Toluic acid will be discussed, aiming to provide an efficient and feasible production method.
II. MATERIALS AND METHODS
1. MATERIALS
The following raw materials are needed for the preparation of p-toluic acid: toluene, potassium permanganate, sulfuric acid, sodium hydroxide.
2. Equipment
The equipment required for the experiment includes: three-necked flask, constant pressure dropping funnel, thermometer, reflux condenser tube, magnetic stirrer and so on.
3. Preparation method
(1) Oxidation of toluene
Add a certain amount of toluene in a three-necked flask, and then slowly add potassium permanganate and sulfuric acid, control the reaction temperature at 60-70 ℃, and stir continuously during the reaction. After the reaction was completed, the reaction solution was poured into ice water, the solid material was precipitated and the crude product was obtained by filtration.
(2) Acidification of the crude product
The crude product was added to a certain concentration of sulfuric acid solution, heated to boiling and kept for a certain time. Then it was cooled to room temperature and filtered to remove the insoluble matter to obtain the acidified solution.
(3) Crystallization and purification
Add appropriate amount of sodium hydroxide solution to the acidified solution, adjust the pH to neutral, and then heat to boiling, so that p-methylbenzoic acid crystals precipitated. After cooling to room temperature, the pure p-toluic acid was obtained by filtration.
III. RESULTS AND DISCUSSION
1. RESULTS
Through the preparation experiment of p-toluic acid, we obtained pure p-toluic acid with high yield.
2. Discussion
During the preparation process, we need to pay attention to control the reaction temperature and pH 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 dosage of potassium permanganate and sulfuric acid, reaction time and so on.
IV.CONCLUSION
In this paper, a feasible method for the preparation of p-methylbenzoic acid was provided, which was experimentally verified to have high yield and purity. This provides a certain reference value for the industrialized production of p-toluic acid.
V. Prospects and Suggestions
Although this paper provides an effective method for the preparation of p-toluic acid, there are still many aspects that can be further investigated and improved. For example, more environmentally friendly and efficient oxidants and catalysts can be explored to reduce the production cost and environmental pollution; the effects of different crystallization conditions on the purity of the product can be investigated to further optimize the crystallization process; and the application study of p-toluic acid can be carried out to expand its application in the fields of medicine, pesticides and dyes.
In order to better promote the production and application development of p-toluic acid, it is suggested that the relevant departments and enterprises should increase the investment, strengthen the cooperation between industry, academia and research, and continuously improve the production process and technology level. At the same time, the awareness of environmental protection should be strengthened and green production should be implemented to ensure that the production of p-toluic acid meets the requirements of environmental protection and contributes to the realization of sustainable development.
