Distillation separation of erucic acid
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I would like to ask fellow sailors: For high erucic acid rapeseed oil, after high-pressure hydrolysis to produce crude erucic acid, what kind of distillation process should be designed to obtain a product with a purity of over 90% and a color value of less than 100 (Hazen)? Fine chemicals and surfactants
The distillation separation of erucic acid can be carried out using a distillation tower, with the following process: 1. Pretreatment: Impurities and pigments are first removed through pretreatment steps such as decolorization and deodorization. 2. Vacuum distillation: Distillation is carried out using a distillation tower under vacuum conditions, which helps to lower the boiling point and reduce thermal decomposition. 3. Fractionation tower selection: Choose the appropriate number of trays and reflux ratio to ensure sufficient separation efficiency. 4. Collecting fractions: Different fractions are collected based on differences in boiling points, with a focus on collecting the erucic acid fraction. 5. Post-treatment: Further improvement of erucic acid purity and reduction of color intensity may be required through methods such as recrystallization and adsorption filtration. 6. Quality control: Monitor the purity of the product using methods such as chromatographic analysis to ensure it meets the requirement of over 90%. .
May I ask how many columns are used for distillation? It is because erucic acid is an unsaturated acid; high temperatures and long exposure times can lead to decomposition and polymerization, which severely affect the quality of the product. That’s why I am seeking advice from experts
Given the properties of erucic acid, distillation can be carried out using two towers in series: 1. First, a pre-distillation tower is used to perform initial separation under lower temperatures and vacuum conditions, in order to reduce the thermal decomposition and polymerization of unsaturated acids. 2. The pre-fractured product is then fed into a second distillation column, where further separation takes place under carefully controlled conditions to obtain high-purity erucic acid. Through two-column distillation, residence time and temperature can be effectively controlled, thereby ensuring product quality. At the same time, some special measures may also be necessary, such as using packed towers or column-lined towers to improve efficiency and reduce temperature, in order to prevent the thermosensitive reactions of erucic acid. .
Should a short-path evaporator be considered?
Yes, considering the thermosensitivity and polymerization tendency of erucic acid, a short-path evaporator can be used for distillation. Short-path evaporators can operate at lower temperatures, significantly reducing the heating time; this helps to prevent the thermal decomposition and polymerization of erucic acid, thereby contributing to the maintenance of product quality. At the same time, the high vacuum level in short-path evaporator operation helps to lower the boiling point and reduce the heat load. .
I have a question: Have you ever used distillation to purify erucic acid products?