Glycerine is produced by aqueous hydrolysis of tallow fat in the Twitchell process under high pressure (40–60 bar) and temperature (250–270 °C). An effort was made to improve the degree of hydrolysis under optimal operating conditions by varying the feed ratio in a 20-L Parr reactor. The 1:4 blend of water/tallow at 256 °C and 60 bar was recorded as optimal operating conditions (non-catalytic), yielding a degree of hydrolysis of 98.4 %. A survey shows that there is a need to find alternate operating control strategies for achieving better efficiency and safe operation. Material and energy balances across the countercurrent hydrolysis tower were developed to calculate the glycerine and free fatty acids in the raffinate and extract phases, using the first principle for dynamic analysis. The model equations were validated and used to identify simple model structures suitable for designing model-based strategies to control the process temperature in the extraction process.

中文翻译：

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高压高温逆流水相水解生产甘油工艺的参数辨识

甘油是在 Twitchell 工艺中在高压 (40–60 bar) 和温度 (250–270 °C) 下通过牛脂的水水解生产的。通过改变 20 L Parr 反应器中的进料比，努力提高最佳操作条件下的水解程度。256 °C 和 60 bar 下的水/牛脂 1:4 混合物被记录为最佳操作条件（非催化），水解度为 98.4%。一项调查表明，需要寻找替代的运行控制策略来实现更好的效率和安全运行。使用动态分析第一原理，开发了逆流水解塔的物质和能量平衡，以计算萃余相和萃取相中的甘油和游离脂肪酸。模型方程经过验证并用于识别适合设计基于模型的策略来控制提取过程中的过程温度的简单模型结构。