Views: 0 Author: Site Editor Publish Time: 2025-10-10 Origin: Site
The present invention discloses a method for ultrasonically assisted extraction of olive pomace oil.
The technical solution employed by the present invention to solve the technical problem is: a method for ultrasonically assisted extraction of olive pomace oil, comprising the following steps:
Step 1: preparing an olive pomace raw material;
Step 2: adding n-hexane to the olive pomace raw material, and ultrasonically assisted extraction for 30 to 60 minutes at a material-liquid ratio of 1:4 to 10, a temperature of 40 to 60°C, an ultrasonic frequency of 2 kHz, and an ultrasonic power of 400 to 800W. The crude olive pomace oil and solvent are separated, and the solvent is recovered. The crude olive pomace oil is then vacuum-dried to obtain olive pomace oil. Olive pomace crude oil;
Step 3: Performing a waterless, long-mix deacidification treatment on the olive pomace crude oil obtained in Step 2 to obtain deacidified olive pomace oil;
Step 4: Dehydrating the deacidified olive pomace oil obtained in Step 3 to obtain dehydrated olive pomace oil;
Step 5: Adding waste clay to the dehydrated olive pomace oil obtained in Step 4 for a primary decolorization treatment to obtain primary decolorized olive pomace oil, and then adding zeolite to the primary decolorized olive pomace oil for a secondary decolorization treatment to obtain secondary decolorized olive pomace oil;
Step 6: Deodorizing the secondary decolorized olive pomace oil obtained in Step 5 to obtain finished olive pomace oil. Preferably, the olive pomace raw material preparation process in step 1 is as follows: olive fruits are cold-pressed at a pressing pressure of 55-60 MPa, a pressing temperature of 45-55°C, and a pressing time of 2-8 hours until the oil content reaches 15-20%, thereby obtaining olive pomace; the olive pomace is dried in the dark at 45-55°C for 1-2 hours, pulverized through a 30-50 mesh sieve, and further dried until the moisture content is 4-6%, thereby obtaining the olive pomace raw material.
Preferably, the vacuum drying conditions in step 2 are as follows: a vacuum degree of 0.08-0.09 MPa, a temperature of 45-55°C, and a drying time of 60-90 minutes. Preferably, the waterless, long-mix deacidification process in step three is as follows: heating the crude olive pomace oil to 65-75°C, adding 75% phosphoric acid at a concentration of 0.02-0.04% by weight of the oil, and homogenizing and mixing, stirring and retaining the mixture for an acid reaction for 10-15 minutes, cooling the mixture to 40-45°C, and then adding 10-14% alkaline solution, stirring and retaining the mixture for a mixing reaction for 40-50 minutes. After the reaction is completed, centrifugation is performed to obtain soapstock and pre-deacidified olive pomace oil. The pre-deacidified olive pomace oil is vacuum-dried, and then filtered under reduced pressure by adding 0.1-0.2% by weight of diatomaceous earth as a filter aid to obtain deacidified olive pomace oil. Preferably, the dehydration conditions in step 4 are as follows: while stirring, pump the deacidified olive pomace oil into the dehydrator, maintain a vacuum of 0.2-0.5 kPa, and perform vacuum dehydration. Dehydration is stopped when the vacuum outlet temperature is equal to room temperature and clear water is present in the dehydrator.
Preferably, the primary decolorization process in step 5 is as follows: heat the dehydrated olive pomace oil to 65-75°C, add 1.5-2.5% waste clay by weight, and stir homogenize for 12-16 minutes. Perform a primary decolorization process for 25-35 minutes at a vacuum of -0.095-0.090 MPa, a temperature of 100-110°C, and a stirring rate of 120-130 rpm. After the primary decolorization process is completed, vacuum cool the oil to 35-45°C and vacuum filter the oil to obtain the primary decolorized olive pomace oil. Preferably, the secondary bleaching process in step 5 is as follows: 1.0-2.0% zeolite by weight is added to the primary bleached olive pomace oil and homogenized with stirring for 15-20 minutes. The secondary bleaching process is then performed for 25-35 minutes under vacuum conditions of -0.095-0.090 MPa, a temperature of 100-110°C, and a stirring rate of 120-130 rpm. After the secondary bleaching process is completed, the oil is vacuum-cooled to 18-25°C and vacuum-filtered to obtain the secondary bleached olive pomace oil.
Preferably, the deodorization conditions in step 6 are as follows: a vacuum of 0.2-0.4 kPa, a deodorization temperature of 200-235°C, and a deodorization time of 1.5-3 hours. Preferably, the finished olive pomace oil in step six has moisture and volatile matter ≤0.10 (%), insoluble impurities ≤0.05 (%), acid value ≤2.0 (mg/g), and peroxide value ≤7.5 (mmol/kg).
Ms. Yvonne
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