Synthesis Scheme of Adipic Acid

1. Background Introduction

Synthesis Scheme of Adipic Acid

Adipic acid, also known as adipic acid dye acid, is an important organic compound widely used in the chemical industry as an intermediate for the preparation of esters, plastics, rubber and other chemical products.
. There are various methods for synthesizing adipic acid, and this article will provide a detailed introduction to a common synthesis scheme for adipic acid.
2. Synthesis scheme of adipic acid

2.1 Raw material preparation
• Croton oil: As the basic raw material of adipic acid, it is obtained through vegetable oil processing. Sodium hydroxide (NaOH): used to catalyze the hydrolysis reaction of croton oil. Sulfuric acid (H2SO4): used to catalyze the oxidation reaction of croton oil. • Water (H2O): Used for dissolving and diluting chemical reagents.
2.2 Synthesis steps of adipic acid
Step 1: Hydrolysis reaction (acid catalysis) - Add a certain amount of croton oil to the reaction kettle and add an appropriate amount of water. -Slowly drip sodium hydroxide solution under constant temperature conditions while stirring with a stirrer. -Control the reaction temperature at 60-80 ℃ and maintain a certain reaction time.

Step 2: Oxidation reaction (acid catalysis) - Transfer the hydrolyzed soybean oil solution to another reaction vessel and add an appropriate amount of sulfuric acid. -Slowly drip oxygen or air into the reaction vessel under constant temperature conditions. -Control the reaction temperature at 140-170 ℃ and maintain a certain reaction time.
Step 3: Neutralization Reaction - Transfer the oxidized adipic acid solution to a neutralization kettle and dilute with an appropriate amount of water. -Slowly drip sodium hydroxide solution for neutralization reaction. -Control the reaction temperature at room temperature and maintain a certain reaction time.
Step 4: Crystallization and Separation - Cool the neutralized adipic acid solution to promote its crystallization. -Solid adipic acid separated by filtration or centrifugation.
3. Experimental condition control
For the synthesis scheme of adipic acid, attention should be paid to the control of the following experimental conditions: - Reaction temperature: hydrolysis reaction temperature should be controlled at 60-80 ℃, oxidation reaction temperature should be controlled at 140-170 ℃, and neutralization reaction temperature should be controlled at room temperature. -Reaction time: Determine the reaction time for each step based on the actual situation, usually between a few hours and a dozen hours. -PH adjustment: In hydrolysis and neutralization reactions, the pH value of the solution is adjusted by controlling the drip rate and dosage of sodium hydroxide solution.
4. Safety precautions
When conducting experiments on the synthesis of adipic acid, the following safety precautions should be taken into account: - Sulfuric acid is highly corrosive, and protective goggles, gloves, and clothing should be worn during operation. -During the oxidation reaction, it is necessary to prevent oxygen or air leakage to avoid causing fires or explosions. -The laboratory should have good ventilation facilities to avoid the accumulation of toxic gases.

Conclusion: Adipic acid can be effectively synthesized through steps such as hydrolysis, oxidation, and neutralization. Controlling the reaction temperature, reaction time, and pH value of the solution, as well as paying attention to experimental safety precautions, are key to achieving the synthesis of adipic acid. Adipic acid, as an important organic compound, the optimization of its synthesis scheme can not only improve production efficiency, but also help reduce production costs and promote the development and application of related fields.
Attention: This document is for reference only. Please follow the operating procedures and safety requirements of the relevant laboratory for specific experimental operations.