Crystallization method of stearoylbenzoylmethane
A stearoylbenzoylmethane and crystallization technology, applied in the chemical field, can solve problems such as difficult separation and reuse, great impact on the environment, and large energy consumption, so as to reduce the separation and recovery process of toluene methanol and improve labor productivity , the effect of reducing production costs
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Embodiment 1
[0014] 1. Condensation: Add 1600KG toluene to a 3000L reaction kettle equipped with a condenser and agitator and connected to a nitrogen source, then add 120KG sodium methoxide under a nitrogen atmosphere, raise the temperature of the above medium to 110°C, and The temperature is controlled at 110°C during the process. Add 600KG methyl stearate (98%), then add 200KG acetophenone in 3 hours. After the addition of acetophenone was complete, the reaction mixture was kept at temperature (110°C) for 1 hour. A total of 174L of methanol-toluene mixture was collected in the reaction.
[0015] 2. Acidification: Then add the thermally condensed solution into 20% hydrochloric acid solution, so that the pH of the water layer after settling is 1.
[0016] 3. Concentration: After the dilute acid layer is separated, it is washed with water. After washing 3 times, the acidified solution was distilled to remove toluene to obtain a solid crude product.
[0017] 4. Crystallization: The 174L ...
Embodiment 2
[0019] 1. Condensation: Add 1700KG toluene to a 3000L reaction kettle equipped with a condenser and agitator and connected to a nitrogen source, then add 120KG sodium methoxide under a nitrogen atmosphere, raise the temperature of the above medium to 110°C, and The temperature is controlled at 110°C during the process. Add 600KG methyl stearate (98%), then add 200KG acetophenone in 3 hours. After the addition of acetophenone was complete, the reaction mixture was kept at temperature (110°C) for 1 hour. A total of 207L of methanol-toluene mixture was collected during the reaction.
[0020] 2. Acidification: Then add the thermally condensed solution into 20% hydrochloric acid solution, so that the pH of the water layer after settling is 1.
[0021] 3. Concentration: After the dilute acid layer is separated, it is washed with water. After washing 3 times, the acidified solution was distilled to remove toluene to obtain a solid crude product.
[0022] 4. Crystallization: The 2...
Embodiment 3
[0024] 1. Condensation: Add 1800KG toluene to a 3000L reaction kettle equipped with a condenser and agitator and connected to a nitrogen source, then add 120KG sodium methoxide under a nitrogen atmosphere, raise the temperature of the above medium to 105°C, and The temperature is controlled at 105°C during the process. Add 600KG methyl stearate (98%), then add 200KG acetophenone in 3 hours. After the addition of acetophenone was complete, the reaction mixture was kept at temperature (105°C) for 1 hour. A total of 200 L of methanol-toluene mixture was collected during the reaction.
[0025] 2. Acidification: Then add the thermally condensed solution into 20% hydrochloric acid solution, so that the pH of the water layer after settling is 1.
[0026] 3. Concentration: After the dilute acid layer is separated, it is washed with water. After washing 3 times, the acidified solution was distilled to remove toluene to obtain a solid crude product.
[0027] 4. Crystallization: The ...
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