Rapeseed oil single-screw squeezing method

Abstract

The invention discloses a rapeseed oil single-screw squeezing method which comprises the following steps: screening and cleaning rapeseeds, removing dirt, and ensuring that raw materials are pure; the cleaned rapeseeds are dried, so that the water content of the rapeseeds is reduced to 7% or below; carrying out crushing treatment on the dried rapeseeds; cooking and frying the rapeseeds; squeezing the rapeseeds by using a single-screw oil press so as to separate out rapeseed oil; impurities and phosphorus in the rapeseed oil are removed through a cold precipitation method; and adding a proper amount of antioxidant and preservative to obtain the rapeseed oil which can be stored for a long time. The rapeseed oil product with stable quality and excellent color and fragrance can be obtained through single-screw squeezing, the production process is safe and sanitary, and it is guaranteed that the produced rapeseed oil meets related food safety standards.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain and oil processing, in particular to a single-spiral pressing method for rapeseed oil. BACKGROUND

[0002] Rapeseed oil is extracted from rapeseed and is one of the main edible oils in China. Rapeseed is rich in fat, monounsaturated fatty acids and polyunsaturated fatty acids, which can provide the required nutrients for the human body. In addition, rapeseed oil is rich in vitamin E and phytosterol, and is a component of a balanced diet.

[0003] The traditional double-spiral pressing process for rapeseed oil has a high temperature, which leads to the peroxidation of oil and the loss of vitamin E. The sinapine in the rapeseed shell is easily dissolved out, causing the oil to have a heavy astringent taste. The residual oil rate is as high as 8-12%, and the oil extraction efficiency is low. The single-spiral pressing method can obtain rapeseed oil products with stable quality, excellent color and aroma, and the production process is safe and hygienic, ensuring that the produced rapeseed oil meets the relevant food safety standards. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide rapeseed oil products with stable quality, excellent color and aroma.

[0005] The present application is achieved by the following technical solutions:

[0006] A single-spiral pressing method for rapeseed oil, characterized by the following steps:

[0007] Firstly, the rapeseed is screened and cleaned to remove dirt and ensure the purity of the raw material;

[0008] Secondly, the cleaned rapeseed is dried to reduce the moisture content to below 7%;

[0009] Thirdly, the dried rapeseed is crushed;

[0010] Fourthly, the rapeseed is steamed and fried;

[0011] Fifthly, the rapeseed is pressed using a single-spiral oil press to separate the rapeseed oil;

[0012] Sixthly, the impurities and phosphorus in the rapeseed oil are removed by cold precipitation;

[0013] Seventhly, appropriate amounts of antioxidants and preservatives are added to obtain rapeseed oil that can be stored for a long time.

[0014] Further, in the second step, the drying temperature is 65 to 80℃.

[0015] Further, in the third step, the crushing treatment adopts a toothed roll crusher, the roll diameter is 600-1200mm, and the roll width is 400-800mm.

[0016] Further, in the fourth step, the steaming temperature is 100-110℃, the steaming time is 1-2h; the frying temperature is 120-150℃, and the frying time is 15-20min.

[0017] Further, in the fifth step, the spiral diameter of the single-spiral oil press is 100-130mm, the spiral rotating speed is 30-50r / min, and the equipped power is 6-12kW.

[0018] Further, in the sixth step, the temperature of the cold precipitation method is 55℃.

[0019] Further, in the seventh step, the added antioxidant and preservative is vitamin E, and the addition amount is 50mg / 100g.

[0020] The present application provides a rapeseed oil single-spiral pressing method, and the present application has the following beneficial effects compared with the prior art:

[0021] The present application can obtain rapeseed oil products with stable quality, excellent color and flavor, and safe and sanitary production process. DETAILED DESCRIPTION

[0022] Embodiment 1: A rapeseed oil single-spiral pressing method, comprising the following steps:

[0023] In the first step, the rapeseed is screened and cleaned to remove dirt and ensure the purity of the raw material;

[0024] In the second step, the cleaned rapeseed is dried to reduce the water content to below 7%, and the drying temperature is 65℃;

[0025] In the third step, the dried rapeseed is crushed, and the crushing treatment adopts a toothed roll crusher, the roll diameter is 600mm, and the roll width is 400mm;

[0026] In the fourth step, the rapeseed is steamed and fried, the steaming temperature is 100℃, the steaming time is 1h; the frying temperature is 120℃, and the frying time is 15min;

[0027] In the fifth step, the rapeseed is pressed to separate the rapeseed oil using a single-spiral oil press, the spiral diameter of the oil press is 100mm, the spiral rotating speed is 30r / min, and the equipped power is 6kW;

[0028] In the sixth step, the impurities and phosphorus in the rapeseed oil are removed by a cold precipitation method, and the temperature is 55℃;

[0029] Step 7: Add an appropriate amount of vitamin E to obtain rapeseed oil that can be stored for a long time, and the addition amount is 50 mg / 100 g.

[0030] Example 2: A single-spiral pressing method for rapeseed oil, comprising the following steps:

[0031] Step 1: Screen and clean the rapeseed to remove dirt and ensure the purity of the raw material;

[0032] Step 2: Dry the cleaned rapeseed to reduce the moisture content to below 7%, and the drying temperature is 70°C;

[0033] Step 3: Crush the dried rapeseed, and the crushing is performed using a toothed roll crusher with a roll diameter of 800 mm and a roll width of 600 mm;

[0034] Step 4: Steam and fry the rapeseed, the steaming temperature is 100°C, and the steaming time is 1.5 h; the frying temperature is 130°C, and the frying time is 18 min;

[0035] Step 5: Use a single-spiral oil press to extract the rapeseed oil, the spiral diameter of the oil press is 110 mm, the spiral rotation speed is 40 r / min, and the power required is 8 kW;

[0036] Step 6: Remove impurities and phosphorus from the rapeseed oil by cold precipitation at a temperature of 55°C;

[0037] Step 7: Add an appropriate amount of vitamin E to obtain rapeseed oil that can be stored for a long time, and the addition amount is 50 mg / 100 g.

[0038] Example 3: A single-spiral pressing method for rapeseed oil, comprising the following steps:

[0039] Step 1: Screen and clean the rapeseed to remove dirt and ensure the purity of the raw material;

[0040] Step 2: Dry the cleaned rapeseed to reduce the moisture content to below 7%, and the drying temperature is 75°C;

[0041] Step 3: Crush the dried rapeseed, and the crushing is performed using a toothed roll crusher with a roll diameter of 1000 mm and a roll width of 700 mm;

[0042] Step 4: Steam and fry the rapeseed, the steaming temperature is 105°C, and the steaming time is 1 h; the frying temperature is 140°C, and the frying time is 18 min;

[0043] Step 5: Use a single-spiral oil press to extract the rapeseed oil, the spiral diameter of the oil press is 120 mm, the spiral rotation speed is 46 r / min, and the power required is 10 kW;

[0044] In the sixth step, impurities and phosphorus in the rapeseed oil are removed by cold precipitation method at a temperature of 55°C.

[0045] In the seventh step, an appropriate amount of vitamin E is added to obtain rapeseed oil that can be stored for a long time, and the addition amount is 50 mg / 100 g.

Claims

1. A rapeseed oil single screw pressing method, characterized in that: The following steps are involved: Screen and clean the rapeseed to remove dirt and ensure the purity of the raw materials; The cleaned rapeseed is dried to reduce its moisture content to below 7%; Crush the dried rapeseed; Steaming and frying rapeseed; Use a single screw oil press to extract rapeseed to separate rapeseed oil; Removal of impurities and phosphorus from rapeseed oil by cryoprecipitation; Add appropriate amount of antioxidants and preservatives to obtain rapeseed oil that can be preserved for a long time and screen and wash the soybeans.

2. A rapeseed oil single-screw pressing method as claimed in claim 1, characterized in that, The drying treatment temperature is 65 to 80°C.

3. A rapeseed oil single screw pressing method as claimed in claim 1, characterized in that, The crushing process adopts a tooth roller crusher with a roller diameter of 600-1200 mm and a roller width of 400-800 mm.

4. A rapeseed oil single-screw pressing method as claimed in claim 1, characterized in that, The steaming temperature is 100-110° C., and the steaming time is 1-2 hours; the frying temperature is 120-150° C., and the frying time is 15-20 minutes.

5. A rapeseed oil single screw pressing method as claimed in claim 1, characterized in that, The single-screw oil press has a screw diameter of 100-130 mm, a screw speed of 30-50 r / min, and a power of 6-12 kW.

6. A rapeseed oil single-screw pressing method as claimed in claim 1, characterized in that: The temperature of the cryoprecipitation method is 55°C.

7. A rapeseed oil single-screw pressing method according to claim 1, characterized in that: The added antioxidant and preservative is vitamin E, and the added amount is 50 mg / 100 g.