Method for preparing basic oil of shortening or butterine without granule crystal by ester exchange method
A technology of margarine and transesterification, which is applied in the field of oil deep processing, and can solve problems such as reports of large-scale industrialization that have not been seen
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Embodiment 1
[0023] Embodiment 1. Analysis and pretreatment of physical and chemical indicators of raw material oil
[0024] Accurately weigh a certain mass of tallow and canola oil, mix tallow / canola oil 80:20 (w / w), and measure their water contents Wc, AV, and PV respectively. And moisture content Wc, AV, PV cause catalyst deactivation; NaOCH in grease weight % 3 The deactivation amount calculation formula is: NaOCH 3失活量 = 3 x Wc + 0.1 x AV + 0.054 x PV, it was determined and calculated that the above mixture deactivates the catalyst used at 0.1% by weight of oil. In industry, under the condition of satisfying the water content Wc, AV, PV limit value, the catalyst of 0.2%~0.4% (according to oil weight) is often used. Therefore, NaOCH is appropriately relaxed here 3 The dosage, add 0.2% ~ 1.0% (according to oil weight). And the above mixture was vacuum-dried at 85° C. for 60 min.
[0025] Table 1 Physical and chemical indicators of raw oil
[0026]
Embodiment 2
[0027] Embodiment 2. raw material grease transesterification reaction
[0028] Accurately weigh 100g of the above-mentioned vacuum-dried mixture, respectively, at temperatures of 60, 75, and 90°C, reaction times of 30, 60, and 90min, NaOCH 3 The full test was carried out under the addition amount of 0.4%, 0.6%, and 1.0% (by oil weight). After the reaction finishes, add 5% citric acid solution 5mL / 100g raw material grease in the reaction product, make NaOCH 3 Inactivate, wash with water at 60-90°C until neutral, take the upper oil phase, add anhydrous sodium sulfate to remove residual water, filter and set aside. Using the above-mentioned solid fat content (SFC), the measurement and calculation method of the reduction rate of symmetrical triglycerides, the reaction substrate and the transesterification product were analyzed respectively. Reaction substrate (0#) and at 60°C, NaOCH 3 See Table 2 for the solid fat content of the product (1#) reacted for 90 minutes with an amoun...
Embodiment 3
[0031] Example 3. Verification of generation of particle-free crystals
[0032] Weigh 50 g of the above-mentioned product (1#), melt at 70° C. for 30 minutes, destroy the original crystal form, and cool at room temperature. Then, repeated temperature fluctuations were carried out under the temperature fluctuation program of 5°C 12h and 20°C 12h as a cycle. After each fluctuation cycle, 1 g of sample was taken for X-ray diffraction crystal analysis and polarizing microscope crystal morphology analysis until the fluctuation reached 14 cycles. The product (1#) can maintain the β′ crystal form in the process of temperature fluctuation, which meets the requirements of plastic shortening for the product crystal form. The crystal form is stable, and no aggregation phenomenon occurs. At the same time, no granular crystals were found by rubbing the sample fluctuating for 14 cycles with fingers.
[0033] figure 1 Microscope picture of grainy crystals of poor-quality shortening. fig...
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