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[Chemical Knowledge]：Production and manufacturing method and process flow of isopropyl acetone

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Isopropylidene acetone (IPA) is an important organic chemical raw material, which is widely used in medicine, pesticide, spice, plastic and other fields. This article will introduce the manufacturing method of mesityl acetone in detail, including raw material preparation, reaction process, post-treatment and precautions.

1. Raw Material Preparation

The main raw materials for the manufacture of mesityl oxide are acetone and isopropanol. These two kinds of raw materials are relatively easy to obtain in the market, the quality is stable, and the price is moderate. Before feeding, the quality inspection of raw materials is required to ensure that its purity and moisture and other indicators meet the process requirements.

2. reaction process

The manufacturing process of mesityl oxide mainly involves an acid-catalyzed dehydration reaction. The specific steps are as follows:

1. acetone and isopropanol are mixed according to a certain molar ratio and added into a reaction kettle with a stirrer and a thermometer. Typically, the molar ratio of acetone to isopropanol is between 1:1 and 2:1.
2. Add an appropriate amount of acid catalyst, such as sulfuric acid or phosphoric acid, to the reactor. The amount of the acid catalyst is generally 0.5 to 2% of the total mass of the raw materials.
3. Start the stirrer and heat the reaction kettle to a certain temperature, generally in the range of 60~80 ℃. Keeping the temperature constant, the reaction time is generally in the range of 2 to 4 hours.
4. In the reaction process, the content of mesityl oxide needs to be sampled and analyzed regularly to determine the reaction progress. When the content of mesityl oxide reached a predetermined value, the reaction was stopped.

3. post-treatment

After the reaction is completed, the reaction solution needs to be post-treated to obtain pure mesityl oxide. The specific steps are as follows:

1. cooling the reaction solution to room temperature, adding an appropriate amount of alkaline absorbent, such as sodium hydroxide or potassium hydroxide solution, to neutralize the remaining acid catalyst.
2. The organic phase was separated, washed neutral with water and dried over anhydrous sodium sulfate.
3. By distillation or rectification method, the isopropyl acetone and unreacted raw materials and impurities are separated, and the higher purity of the isopropyl acetone product is collected.

4. precautions

1. in the process of operation, should strictly abide by the safety procedures, wear protective equipment, to prevent acid and alkali splash and other accidental injuries.
2. Check and maintain the equipment regularly to ensure the normal operation of the equipment and prevent the occurrence of malfunctions and leakage accidents.
3. Properly dispose of waste to avoid environmental pollution.

In summary, the manufacturing method of mesityl oxide involves the steps of raw material preparation, reaction process and post-treatment. In the process of operation, it is necessary to pay attention to safety, environmental protection and other issues to ensure product quality and production efficiency. At the same time, according to actual needs, process parameters and equipment configuration can be further optimized to improve production and economic benefits.

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