Method for squeezing and refining walnut oil at low temperature

A technology of walnut oil and low temperature is applied in the field of low temperature pressing and refining of walnut oil, which can solve the problems of increased workload and production cost, decreased quality of walnut oil, loss of trace elements, etc. The effect of less energy consumption

Inactive Publication Date: 2014-11-05
FUYUAN COUNTY JUNONG GREEN FOOD DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional walnut oil production is prepared by high-temperature steaming, frying and pressing. This method produces oil quickly, but the crude oil has many impurities and needs repeated chemical treatments, which increases the workload of refining and production costs, and is not conducive to human health.
And high temperature treatment can easily cause the beneficial components in the oil, such as vitamin E, carotene and phytosterols to degrade or cause the loss of trace elements, which will reduce the quality of walnut oil and shorten the shelf life

Method used

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  • Method for squeezing and refining walnut oil at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First, select the walnut kernels, remove the deteriorated walnut kernels and foreign matter, and make the impurity content ≤ 5%. Then, soak the walnut kernels in 0.6% dilute sodium hydroxide solution at 70°C for 10 minutes, and then rinse the walnut kernels with cold water. The peeled walnuts are dried in a mixed-flow hot air dryer to a moisture content of 10%. The dried walnut kernels are subpackaged into 4kg small packages, and put into the mold of the vertical cylinder hydraulic oil press, and each material layer is separated by a thin iron sheet. Pressing at room temperature, using segmented boosting method, the boosting speed of the pre-pressing section with a pressure ≤ 10MPa is 4MPa / min, the boosting speed of the oil outlet section with a pressure of 11-20MPa is 2MPa / min, and the draining section with a pressure of 21-40MPa The pressure increase speed is 3MPa / min, and the pressure is released after the pressure rises to 40MPa. Put the squeezed walnut oil aside ...

Embodiment 2

[0036] First, select the walnut kernels, remove the deteriorated walnut kernels and foreign matter, and make the impurity content ≤ 5%. Then, soak the walnut kernels in 0.5% dilute sodium hydroxide solution at 80°C for 15 minutes, and then rinse the walnut kernels with cold water. The peeled walnut kernels are dried in a vacuum constant temperature dryer to a moisture content of 8%. The dried walnut kernels are subpackaged into 6kg small packages, and put into the mold of the vertical cylinder hydraulic oil press, and each material layer is separated by a thin iron sheet. Pressing at room temperature, using segmented boosting method, the boosting speed of the pre-pressing section with a pressure ≤ 10MPa is 4MPa / min, the boosting speed of the oil outlet section with a pressure of 11-20MPa is 2MPa / min, and the draining section with a pressure of 21-40MPa The pressure increase speed is 3MPa / min, and the pressure is released after the pressure rises to 40MPa. Centrifuge the fres...

Embodiment 3

[0038]First, select the walnut kernels, remove the deteriorated walnut kernels and foreign matter, and make the impurity content ≤ 5%. Then, soak the walnut kernels in 0.4% dilute potassium hydroxide solution at 90°C for 20 minutes, and then rinse the walnut kernels with cold water. The peeled walnut kernels are dried in a continuous disc dryer to a moisture content of 6%. The dried walnut kernels are subpackaged into 8kg small packages, and put into the mold of the vertical cylinder hydraulic oil press, and each material layer is separated by a thin iron sheet. Pressing at room temperature, using segmented boosting method, the boosting speed of the pre-pressing section with a pressure ≤ 10MPa is 4MPa / min, the boosting speed of the oil outlet section with a pressure of 11-20MPa is 2MPa / min, and the draining section with a pressure of 21-40MPa The pressure increase speed is 3MPa / min, and the pressure is released after the pressure rises to 40MPa. Centrifuge the freshly squeez...

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Abstract

The invention discloses a method for squeezing and refining walnut oil at low temperature. The method comprises the steps of: selecting, peeling, squeezing, deslagging, hydrating, dewatering, removing impurities, and the like. The method comprises the following specific steps of: selecting walnut kernels subjected to impurity removal; peeling by dilute alkali liquor in a wet way; then drying until the water content is not greater than 10%; squeezing the dried walnut kernels by an squeezing machine at normal temperature; pressurizing at the rate of 2 to 4MPa / min until reaching the pressure of 40MPa; then releasing the pressure, and discharging; heating crude oil obtained by impurity removal to reach temperature more than 30 DEG C; adding 0.5 to 1.0% of water and 0.02 to 0.04% of citric acid based on the weight of oil; stirring at the speed of 40 to 50r / min to reach full hydrating; maintaining the temperature and standing for more than 24 hours; separating to obtain the supernatant oil; heating the supernatant oil to reach 100 to 110 DEG C; and dewatering, filtering, and adding 0.02 to 0.04% of antioxidant based on the weight of the oil. The method disclosed by the invention is reasonable in production technology and high in oil yield; the produced walnut oil is high in nutrient value, has no impurities or precipitate, and is stable in quality; and moreover, the equipment used in the method is high in practicability and less in energy consumption, so that the workload in refining can be effectively reduced, and the producing cost can be decreased.

Description

technical field [0001] The invention belongs to the technical field of edible oil processing, and in particular relates to a method for pressing and refining walnut oil at low temperature. Background technique [0002] Walnut oil is rich in unsaturated fatty acids, multivitamins and trace elements such as calcium, iron and magnesium, which can assist in the treatment of cardiovascular diseases, promote the development of bones and nervous system, resist oxidation and regulate immune functions, etc. Nutritious woody vegetable oil is favored by more and more consumers. Traditional walnut oil production is prepared by high-temperature steaming, frying and pressing. This method produces oil quickly, but the crude oil has many impurities and needs repeated chemical treatments, which increases the workload of refining and production costs, and is not conducive to human health. And high temperature treatment can easily cause the beneficial components in the oil, such as vitamin E,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A23D9/02
Inventor 邹真
Owner FUYUAN COUNTY JUNONG GREEN FOOD DEV
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