Process for producing methanesulfonic acid
A technology of methanesulfonic acid and hydrochloric acid, applied in the preparation of sulfate, organic chemistry and other directions, can solve the problems of adverse effects of industrialization process, difficult separation of calcium sulfate, poor operation safety, etc., and achieves easy industrialized safe production, simple separation, small investment
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Embodiment 1
[0024] Add 1000 grams of water and 252 grams (2 mol) of anhydrous sodium sulfite to a 2-liter four-neck round-bottomed flask equipped with electric stirring, constant pressure dropping funnel, reflux condenser, tail gas absorption device and thermometer, and slowly heat to 50°C And stir, after the sodium sulfite is completely dissolved, the pH value of the measured solution should be 6.5 to 7.8, otherwise use dilute acid (such as about 10% sulfuric acid) or dilute alkali (such as about 10% sodium hydroxide) solution to adjust the pH value to the above range. Then the solution was rapidly heated to 90° C., 126.1 grams (1 mol) of dimethyl sulfate was added dropwise within 1 hour, and the reaction was continued for 4 hours after the dropwise addition. The reaction solution was evaporated and concentrated under reduced pressure until the sodium methanesulfonate was nearly saturated, and about 500ml of water was distilled out at this time. Then, the concentrated reaction solution ...
Embodiment 2
[0026] Add 1000 grams of water and 252 grams (2 mol) of anhydrous sodium sulfite successively to a 2-liter four-neck round bottom flask equipped with electric stirring, constant pressure dropping funnel, reflux condensation, tail gas absorption device and thermometer, slowly heat to 50 °C and Stir, and after the sodium sulfite is completely dissolved, the pH value of the measured solution should be 6.5-7.8, otherwise use dilute acid (such as about 10% sulfuric acid) or dilute alkali (such as about 10% sodium hydroxide) solution to adjust the pH value to the above scope. Then the solution was rapidly heated to 90° C., and 126.1 g (1 mol) of dimethyl sulfate was added dropwise within 1.5 hours, and the reaction was continued for 4 hours after the dropwise addition. Evaporate and concentrate the reaction solution under reduced pressure until the sodium methanesulfonate is close to saturation (approximately 500ml of water is evaporated), add a salt-removing agent-sodium chloride (...
Embodiment 3
[0028] Add 1000 grams of water and 252 grams (2 mol) of anhydrous sodium sulfite to a 2-liter four-necked round-bottomed flask equipped with electric stirring, constant pressure dropping funnel, reflux condenser, tail gas absorption device and thermometer, and slowly heat to 50°C And stir, after the sodium sulfite is completely dissolved, the pH value of the measured solution should be 6.5-7.8, otherwise use dilute acid (such as about 10% sulfuric acid) or dilute alkali (such as about 10% sodium hydroxide) solution to adjust the pH value to the above range. Then the solution was rapidly heated to 90° C., and 126.1 grams (1 mol) of dimethyl sulfate was started to be added dropwise, which took about 2 hours, and the reaction was continued for 5 hours after the dropwise addition. Evaporate and concentrate the reaction solution until the sodium methanesulfonate is nearly saturated, add a salt-removing agent-sodium chloride (about 135 grams) to saturation while it is hot, and then ...
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