苯甲酸钠工艺生产流程
    英文回答：
    Benzoic Acid Sodium Manufacturing Process.
    Benzoic acid sodium, also known as sodium benzoate, is a widely used food preservative and antifungal agent. It is typically produced through a two-step process involving the neutralization of benzoic acid with sodium hydroxide followed by crystallization and purification.
    1. Neutralization.
    Benzoic acid is dissolved in water and reacted with sodium hydroxide (NaOH) to form sodium benzoate. This reaction is exothermic, releasing heat.
reactor then    C6H5COOH + NaOH → C6H5COONa + H2O.
    The reaction is typically carried out in a stirred reactor at temperatures between 70-80°C.
The pH of the solution is monitored and maintained at around 7-8 to ensure complete neutralization.
    2. Crystallization.
    The sodium benzoate solution is then concentrated by evaporation to increase its solubility. As the solution cools, sodium benzoate crystallizes out of the solution.
    C6H5COONa(aq) → C6H5COONa(s)。
    The crystallization process is typically carried out in a crystallizer or evaporator at controlled temperatures and agitation rates.
    3. Filtration and Drying.
    The sodium benzoate crystals are separated from the mother liquor by filtration. The crystals are then washed and dried to remove any impurities or residual moisture.
    4. Purification.
    The sodium benzoate may undergo additional purification steps to remove any impurities or byproducts formed during the process. This can involve recrystallization, ion exchange, or other purification techniques.
    Chinese 回答：
    苯甲酸钠生产工艺流程。
    苯甲酸钠是一种广泛使用的食品防腐剂和抗真菌剂。它通常通过两步法生产，包括用氢氧化钠对苯甲酸进行中和，然后进行结晶和纯化。
    1. 中和。
    苯甲酸溶解在水中，并与氢氧化钠 (NaOH) 反应形成苯甲酸钠。该反应是放热的，释放热量。
    C6H5COOH + NaOH → C6H5COONa + H2O.
    反应通常在搅拌反应器中于 70-80°C 的温度下进行。溶液的 pH 值受到监测并保持在 7-8
左右，以确保完全中和。
    2. 结晶。
    然后通过蒸发浓缩苯甲酸钠溶液以增加其溶解度。随着溶液冷却，苯甲酸钠从溶液中结晶出来。
    C6H5COONa(aq) → C6H5COONa(s)。
    结晶过程通常在结晶器或蒸发器中在受控的温度和搅拌速率下进行。
    3. 过滤和干燥。
    苯甲酸钠晶体通过过滤与母液分离。然后清洗和干燥晶体，去除任何杂质或残留水分。
    4. 纯化。
    苯甲酸钠可以进行额外的纯化步骤，以去除该过程中形成的任何杂质或副产品。这可能涉及再结晶、离子交换或其他纯化技术。

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