Sulfolane process flow diagram

The production process of sulfolane generally includes the following steps: 1. Raw material preparation: Aniline, *** and concentrated sulfuric acid are mixed in certain proportions to produce a nitration mixture acid, which serves as the raw material for sulfolane. 2. Reaction: The nitrating mixed acid is added to the reaction vessel, while the reaction temperature and stirring speed are controlled to carry out the nitration reaction and produce sulfolane. 3. Neutralization: The reactants after the reaction is complete are slowly added to the alkaline solution in the neutralization tank, and the pH value is controlled to neutralize any remaining acid in the reactants, thereby forming sulfolane salts. 4. Precipitation: An precipitant such as ethanol or ether is added to the neutralized sulfolane salt solution, where it reacts with the salt to form a solid sulfolane precipitate. 5. Filtration and washing: The sulfolane precipitate is filtered and washed to remove impurities and moisture. 6. Drying: The washed sulfolane precipitate is dried at high temperature to remove residual moisture, yielding pure sulfolane crystals. The following is a simplified process flow diagram for sulfolane production: raw material preparation -> reaction -> neutralization -> precipitation -> filtration and washing -> drying.

The following is a simplified diagram of the process for producing sulfolane: Raw materials: benzoic acid, butanol, concentrated sulfuric acid, dilute sulfuric acid, ethylene oxide, sodium hydroxide, hydrofluoric acid. 1. Benzoic acid and butanol are mixed and reacted to produce cyclobutyl formate. 2. Cyclobutyl formate is heated with concentrated sulfuric acid to produce cyclobutyl methanesulfonic acid. 3. Cyclobutyl methanesulfonic acid is heated with dilute sulfuric acid to produce cyclosulphone. 4. Sulfolane is added to ethylene oxide to carry out an epoxidation reaction, producing cyclobutyl epoxymethane. 5. Cyclobutyl epoxymethane is converted into cyclobutyl methanol through a hydrolysis reaction. 6. Cyclobutyl methanol is added to a sodium hydroxide solution to carry out an alcoholysis reaction, yielding cyclobutene. 7. High-purity sulfolane is produced through treatment with hydrofluoric acid. The above is a simplified diagram of the sulfolane production process for reference only. In practical operations, factors such as heating conditions and reaction time also need to be considered.