Walnut oilproduction line

Analysis shows that the kernels contain 60%～70% fat, which is the first among all woody oils. It is known as the "oil depot on the tree", 15%～20% protein, 10 %-15% carbohydrates, in addition to vitamin A, B, E, K, carotene, riboflavin, thiamine and calcium, phosphorus, iron, copper, cobalt, selenium, iodine and other elements. The fatty acid composition of walnut oil is mainly 56% linoleic acid and 14% linolenic acid. Among them, linolenic acid is an essential fatty acid for the human body. It has the effect of lowering blood lipids, preventing coronary heart disease and atherosclerosis, and improving learning, memory and omental reflex. Ability to prevent Alzheimer’s disease and cancer. In addition, linoleic acid also has the effect of making the skin smooth and delicate, and enjoys the reputation of "skin beautifying acid". Therefore, the use of rich walnut resources to develop aromatic refined walnut oil and VA, VE multi-dimensional fortified walnut oil, provide a high-grade health-care edible oil, and promote the process of walnut industrialization, drive regional economic development and increase farmers’ income. An industrialization project of far-reaching significance.

 

Ⅰ. The production process of walnut oil pressing equipment:

Walnut kernel → peeling → drying → pressing → filtering → cold pressing oil → going to the refining workshop

 

1. Walnut oil complete equipment developed by Zhongxing Grain and Oil Machinery is mainly cold pressing of walnut kernels, but also hot pressing.

2. Using peeling, drying, and cold pressing technology, the pressed oil is light in color, low in acid value, and high in nutritional value.

3. The benzopyrene index that customers are more concerned about is solved in the squeezing process, and the nutrients are fully maintained.

4. The oil press adopts hydraulic and screw cold press, the output of this machine can be adjusted, the residual oil is low, and the production efficiency is high.

Description of main equipment:

Serial number	Equipment name	Quantity	Description
1	Hoist	2	Used for conveying materials in every link
2	Dryer	1	Used for drying and dehydrating walnut kernels
3	Oil press	1	Used to squeeze walnut oil
4	Filter	1	Used to filter a small amount of impurities in crude oil

 

Ⅱ. Refining process:

1. Brief description:

This workshop adopts the intermittent refining production process. According to the different types and quality of crude oil, the process parameters can be adjusted and different refining methods can be selected to produce first, second and third grade edible oil; the process equipment we provide has the following advantages:

Flexible and convenient adjustment, even if the quality of raw materials changes slightly, it can still be produced normally;

Maximum use of heat, significant energy saving effect;

The fully enclosed production process avoids the oxidation of grease and ensures the high quality and stability of the product;

The appearance of the equipment is clean and beautiful, the equipment is guaranteed for a long time, and the life-long after-sales service.

2. Description of refining process:

(1) Process diagram：

                     Caustic soda        Hot water       White clay       Vacuum     Recycled water

                              ↓                         ↓                      ↓                    ↓                   ↓ 

Crude oil → Alkali refining → Degumming → Bleaching → Deodorize → Cool down → Deodorized oil → Go to the dewaxing workshop

 

(2) Process flow description:

①Alkali refining operation: adjust the oil temperature to about 60℃, then add 20-30Be lye (1kg caustic soda + 5kg water lye) within 5-10min, and stir for 5-10min under the condition of 60r/min, Observe the formation and separation of soap particles after the reaction and start to slowly heat up, change to slow stirring, and increase by about 1°C every minute. When the temperature reaches 65°C, the oil soap separates obviously, stop stirring and start to settle the soap feet. Generally, it is necessary Soap feet are released after 4-6 hours.

② Washing operation: After the soapstock is released, the oil is further heated to 75°C, and then hot water greater than 5% of the oil weight is added for washing. The water temperature should be 5-10°C higher than the oil temperature, and the water temperature should be 5-10°C higher than the oil temperature. It is easy to emulsify when the water temperature is too low; After adding water, continue to stir for 5 minutes, and then settle for 3-4 hours, release soapy water, and wash repeatedly 1-2 times, depending on the quality of the clear oil.

③Decolorization operation: turn on the vacuum pump to make the vacuum ≧700mmHg; first suck the washed alkali refining oil into the decolorization tank, turn on the stirring and increase the temperature under the vacuum state, and continue to stir for 10 minutes after the temperature reaches 100℃ to reduce the water content in the oil to 0.1% Below, inhale a small amount of decolorizing agent (white clay or activated carbon), the amount of addition depends on the oil product, generally 2%-4% of the oil amount, after stirring for 20 minutes, the temperature is cooled to about 90°C, the vacuum is broken, and the decolorization pump is turned on to filter The machine separates oil and soil to obtain decolorized oil.

④ Deodorization operation: the decolorized oil is sucked into the deodorization tank by a vacuum. When the vacuum degree reaches 755mmHg and the temperature is above 150℃, the bottom is opened and the steam is directly distilled and deodorized, and the timing is started.

a. Deodorization time: 2-3h,

b. Deodorization temperature: 220℃-240℃,

c. Deodorization vacuum degree: 755mmHg or more,

d. The whole process must be directly steam distilled.

3. Description of main equipment：

Serial number	Device name	Quantity	Description
1	Refining tank	2	Used for acid refining, alkali refining and water washing
2	Decolorizing tank	1	Used for dehydration, mixing oil and decolorant
3	Deodorization tank	1	It is made of 304 stainless steel and used for distillation to remove oil odor and light components
4	Vacuum pump	1	The vacuum needed for decolorization and deodorization can reach 755mmhg
5	Air compressor	1	Drying bleaching clay
6	Steam generator	1	Generate steam for distillation
7	filter	1	Filtration separation of clay oil
8	Heat conducting oil furnace	1	Provide system heat energy,temperature can reach 300℃

 

Ⅲ. Dewaxing process

1. Brief description:

In processing walnut oil fat, the wax inherent in walnut oil fat can be separated from the fat through the dewaxing process, so as to enhance the nutritional value of the fat and improve the taste of the fat.

The equipment characteristics of this workshop:

The operation is flexible and convenient, and the labor intensity is extremely low;

The production and production environment are clean and hygienic in a fully enclosed state;

All clean tap water is recycled, no sewage is generated or discharged, and it meets environmental protection standards.

2. Description of dewaxing process:

　deodorized oil → pre-cooling → crystallization and crystal growth → filtration and separation → refined oil

 

3. Description of main equipment：

Serial number	Device name	Quantity	Description
1	Crystallizer	3	It is used for oil freezing and crystallization
2	Refrigeration unit	1	Provide low temperature refrigerant to cool and freeze the oil
3	filter	1	Used to separate oil and wax
4	Refrigerant pump	1	For refrigerant circulation
5	Finished oil tank	1	Used for temporary filtration of product oil
6	Product oil pump	1	It is used to transport product oil to product oil tank

 

 

 

 

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