Method for preparing idesia oil from idesia peel

Abstract

The invention relates to a method for preparing idesia oil from idesia peel, which comprises the following steps: (1) primary squeezing: performing primary squeezing on dried idesia peel, and separating to obtain primary squeezed idesia crude oil and primary squeezed cake meal; (2) infiltrating the cake meal; infiltrating the virgin cake meal by using an extraction solvent; (3) squeezing auxiliary extraction: carrying out secondary squeezing on the infiltrated cake meal obtained in the step (2) to obtain an extraction liquid; and (4) separating the leaching solution, namely separating the leaching solvent and the idesia polycarpa leaching crude oil from the leaching solution in the step (3). The idesia oil is extracted by using the idesia peel as the raw material, the idesia peel resource waste and the environmental pollution are reduced, and the oil extraction is fast and the solvent consumption is low by adopting the squeezing-assisted extraction mode.

Description

Technical Field

[0001] The invention relates to a method for preparing tung oil from tung fruit peel, belonging to the technical field of oil processing methods. Background Art

[0002] Castanopsis alba is also known as water winter melon, water winter tung and chair tree. It belongs to the family of Caryophyllaceae. Castanopsis alba is a deciduous tree, mainly distributed in Yunnan, Guangxi, Sichuan, Guizhou and other places in my country. Castanopsis alba has high edible and medicinal value. Castanopsis alba oil is rich in unsaturated fatty acids such as linoleic acid and vitamin E. It has the effects of inhibiting platelet aggregation, lowering blood pressure and blood lipids, and is widely used in the fields of medicine and health care. At the same time, Castanopsis alba oil can also be used to produce soaps, paints and converted into biodiesel.

[0003] At present, the pressing method for producing tung oil mainly uses tung seeds and fruits as raw materials for direct pressing, or whole fruit pressing. However, the oil yield of tung seeds is low, and the oil obtained by pressing fruits or whole fruits contains more impurities, which is not conducive to graded use, and the utilization value of tung peel cannot be fully utilized, affecting economic and social benefits.

[0004] Publication number CN114907910A Chinese invention patent application discloses a kind of extraction process for tung oil, tung fruit is subjected to low temperature cold pressing treatment, crude oil A and press cake are obtained, 2 to 6 times the weight of extractant are added after the press cake is cooled, subcritical extraction is performed to obtain crude oil B, and finally crude oil A and crude oil B are filtered and mixed, and octanoic acid glyceride is added and heated to obtain tung oil finished oil. This method solves the problem that the press cake residual oil cannot be effectively extracted and the impurity content in the oil material is high in the traditional tung cold pressing technology, but the method has complicated steps in actual operation, high requirements for instruments and equipment, large amount of extractant used, increased difficulty of subsequent treatment, and long extraction time, which is not conducive to large-scale promotion. Moreover, mixing cold pressed crude oil and extracted crude oil is not conducive to the graded use of tung oil.

[0005] Therefore, there is an urgent need for a method for preparing tung oil from tung peel to solve the problems of waste of tung peel resources, low oil yield, high residual oil in oil cakes, and single production and inability to comprehensively utilize. Summary of the invention

[0006] The purpose of the present invention is to provide a method for preparing ashwagandha oil from ashwagandha peel. The present invention adopts a pressing-assisted extraction method, optimizes the extraction conditions, has a fast oil extraction speed, and has less extraction solvent consumption and residue, thus creating good conditions for subsequent refining and processing.

[0007] In order to achieve the above object, the technical scheme of the method for preparing Alpinia oxyphylla oil from Alpinia oxyphylla peel in the present invention is:

[0008] A method for preparing tung oil from tung fruit peel comprises the following steps:

[0009] (1) Primary pressing: The dried Alpinia schrenkiana peel is pressed for the first time to separate the primary Alpinia schrenkiana crude oil and primary pressed cake;

[0010] (2) Cake soaking: soaking the virgin cake with an extraction solvent;

[0011] (3) pressing-assisted extraction: subjecting the soaked cake obtained in step (2) to secondary pressing to obtain an extract;

[0012] (4) Separating the extract: separating the extract solvent and the Castanopsis schrenkiana crude oil from the extract in step (3).

[0013] The beneficial effects of the above technical solution are: the present invention uses the ash peel as a processing raw material, thereby improving the economic and social value of the ash peel, reducing the waste of ash peel resources and the pollution to the environment. The pressing-assisted extraction method is adopted to optimize the extraction conditions, shorten the extraction time, reduce the consumption and residue of the extraction solvent, and facilitate subsequent processing.

[0014] As a further improvement, the water content of the Alpinia oxyphylla peel in step (1) is 1%-13%. Preferably, healthy Alpinia oxyphylla peel without chemical pollution and biological pollution is selected.

[0015] The beneficial effect of the above technical solution is that the water content is controlled between 1% and 13%, which can increase the oil output rate during the pressing process.

[0016] As a further improvement, the initial pressing in step (1) is cold pressing. Preferably, the initial pressing temperature is ≤60°C, and there is no obvious oil residue left in the filtered oil, and no oil-water separation.

[0017] The beneficial effect of the above technical solution is that the present invention uses a cold pressing method when using the tung oil to extract the tung oil peel, which can retain the effective ingredients in the tung oil to the greatest extent.

[0018] As a further improvement, the soaking in step (2) is any one of spraying the leaching solvent and mixing to soak the cake or soaking the leaching solvent and draining to soak the cake.

[0019] The beneficial effect of the above technical solution is that the cake soaking of the present invention can extract the residual oil in the cake. Compared with other cake extraction methods, because the present invention needs to use pressing to assist extraction, the use of solvent can be reduced during cake soaking and the extraction time can be shortened.

[0020] As a further improvement, the extraction solvent in step (2) is an organic solvent.

[0021] As a further improvement, the organic solvent is any one of petroleum ether, No. 6 light gasoline or n-hexane.

[0022] The beneficial effect of the above technical solution is that the above organic solvent is a common solvent with a wide source and low price.

[0023] As a further improvement, the method for separating the extract in step (4) is any one of solvent evaporation, sedimentation separation, centrifugation, filtration, microporous membrane filtration or ultrafiltration.

[0024] Compared with the prior art, the present invention can obtain the following beneficial effects:

[0025] 1. The present invention uses the tung oil peel as a processing raw material, thereby increasing the economic and social value of the tung oil peel, reducing the waste of tung oil peel resources and the pollution to the environment, broadening the source channels of tung oil, and promoting the graded utilization and comprehensive utilization of tung oil.

[0026] 2. The present invention adopts a pressing-assisted extraction method, which optimizes the extraction conditions, quickly extracts oil, consumes less extraction solvent and has less residual amount, which is convenient for subsequent refining and processing; at the same time, it causes little damage to the machine, reduces production costs, reduces environmental pollution, and effectively solves the drawbacks of traditional oil cake pressing and extraction.

[0027] 3. The raw materials of the present invention are cheap, the source channels are wide, the technical requirements are low, the process effect is good, many types of oils can be produced, and various requirements can be met, so the market prospect is good. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with specific embodiments. It should be noted that, under the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form new embodiments. The equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments are all conventional methods in the art unless otherwise specified.

[0029] Example 1

[0030] The method for preparing Alpinia oxyphylla oil from Alpinia oxyphylla peel of this embodiment is specifically implemented as follows:

[0031] Step 1: Material selection: Pour the ash peels onto a mesh conveyor running at 0.5m / s, and remove the peels that are rotten, infested, etc. manually.

[0032] Step 2: Drying: Place the qualified peels in a cool and ventilated place for air drying to reduce the moisture content to about 10%.

[0033] Step 3: Primary pressing: Pressing is performed through an oil press at a pressing temperature of 50°C to obtain cold-pressed crude oil (pressed oil), oil cake and oil residue. The cold-pressed crude oil is passed through a 300-mesh filter cloth and then centrifuged at 3000r / s to obtain crude oil with no obvious oil residue residue and no oil-water stratification.

[0034] Step 4: Cake soaking: Distribute the cake evenly on the conveyor, spray it with No. 6 light gasoline and mix it well to soak the cake.

[0035] Step 5: Pressing-assisted extraction: The cake obtained in step 4 is pressed under the pressing conditions of step 3 to obtain an extract and secondary cake.

[0036] Step 6: Separating the extract: Evaporating the obtained extract, and making the residual organic solvent content meet the national standard (LS / T 3258-2018 Castanopsis chinensis oil) after stripping to obtain Castanopsis chinensis leaching crude oil.

[0037] The overall oil yield of this embodiment is 31.05%. The national standard "LS / T 3258-2018 Tung Oil" is used to perform relevant tests on the virgin oil and the extracted oil. The test results are shown in Table 1.

[0038] Table 1 Test results of virgin oil and leached oil

[0039] Virgin oil Leached oil Smell and taste Intrinsic smell and flavor of tung oil Intrinsic smell and flavor of tung oil Acid value 2.3mg / g 2.5mg / g Saponification value 192mg / g 196mg / g Moisture and volatiles 0.07％ 0.05％ Insoluble impurities 0.03％ 0.02％

[0040] Example 2

[0041] The method for preparing Alpinia oxyphylla oil from Alpinia oxyphylla peel of this embodiment is specifically implemented as follows:

[0042] Step 1: Material selection: Pour the peels of the Castanopsis tung oil onto the conveyor, which runs at 1m / s and manually picks up the peels to remove rotten, insect-damaged, etc.

[0043] Step 2: Drying: Place the qualified peels evenly in a multi-layer oven to reduce the moisture content to about 6%.

[0044] Step 3: Primary pressing: Pressing is performed through an oil press at a pressing temperature of 60°C to obtain cold-pressed crude oil (pressed oil), oil cake and oil residue. The cold-pressed crude oil is passed through a 200-mesh filter cloth and then centrifuged at 4000r / s to obtain crude oil with no obvious oil residue residue and no oil-water stratification.

[0045] Step 4: Cake soaking: Place the cake on a mesh filter, filter in a container containing petroleum ether, and drain.

[0046] Step 5: Pressing-assisted extraction: The cake obtained in step 4 is pressed under the pressing conditions of step 3 to obtain an extract and secondary cake.

[0047] Step 6: Separating the extract: Evaporating the obtained extract, and making the residual solvent content meet the national standard (LS / T3258-2018 Castanopsis chinensis oil) after stripping to obtain Castanopsis chinensis extracted crude oil (extracted oil).

[0048] The overall oil yield of this embodiment is 30.28%. The national standard "LS / T 3258-2018 Tung oil" is used to perform relevant tests on the virgin oil and the extracted oil. The test results are shown in Table 2.

[0049] Table 2 Test results of virgin oil and leached oil

[0050] Virgin oil Leached oil Smell and taste Intrinsic smell and flavor of tung oil Intrinsic smell and flavor of tung oil Acid value 2.6mg / g 2.8mg / g Saponification value 195mg / g 198mg / g Moisture and volatiles 0.07％ 0.05％ Insoluble impurities 0.04％ 0.03％

[0051] In other embodiments, the water content of the Alpinia oxyphylla peel is between 1-7% or 10-13%, and Alpinia oxyphylla oil with the same quality as that in this embodiment can be obtained.

[0052] In summary, the present invention uses the fruit peel of the Chinese tallow tree as a processing raw material, adopts a squeezing method of primary squeezing and secondary squeezing assisted extraction, and successfully produces the Chinese tallow tree pressed oil and the Chinese tallow tree leached oil from the fruit peel of the Chinese tallow tree. The method for preparing Chinese tallow tree oil from the fruit peel of the present invention improves the economic and social value of the fruit peel of the Chinese tallow tree, reduces the waste of resources of the fruit peel of the Chinese tallow tree and the pollution to the environment, and simultaneously obtains two kinds of Chinese tallow tree oil, which is of great significance to promoting the graded utilization and comprehensive utilization of the Chinese tallow tree oil. Moreover, the method of the present invention adopts a squeezing assisted extraction method, which uses less solvent than traditional extraction, is short in time, and is convenient to obtain the extracted oil. At the same time, squeezing after extraction causes little damage to the machine, reduces production costs, reduces environmental pollution, and effectively solves the drawbacks of traditional oil cake squeezing and extraction.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the specification of the present invention should also be included in the protection scope of the present invention.

Claims

1. A method for preparing tung oil from tung fruit peel, characterized in that: The following steps are involved: (1) Primary pressing: The dried Alpinia schrenkiana peel is pressed for the first time to separate the crude Alpinia schrenkiana oil and the primary pressed cake; (2) Cake soaking: soaking the virgin cake with an extraction solvent; (3) pressing-assisted extraction: subjecting the soaked cake obtained in step (2) to secondary pressing to obtain an extract; (4) Separating the extract: separating the extract solvent and the Castanopsis schrenkiana crude oil from the extract in step (3).

2. The method for preparing Alpinia oxyphylla oil from Alpinia oxyphylla peel according to claim 1, characterized in that: The water content of the tung oil seed peel in step (1) is 1%-13%.

3. The method for preparing Alpinia affine oil from Alpinia affine peel according to claim 1, characterized in that: The first pressing in step (1) is cold pressing.

4. The method for preparing Alpinia affine oil from Alpinia affine peel according to claim 1, characterized in that: In step (2), the soaking is any one of spraying the leaching solvent and mixing well to soak the cake or soaking the leaching solvent and draining to soak the cake.

5. The method for preparing Alpinia affine oil from Alpinia affine peel according to claim 1, characterized in that: The extraction solvent in step (2) is an organic solvent.

6. The method for preparing Alpinia affine oil from Alpinia affine peel according to claim 5, characterized in that: The organic solvent is any one of petroleum ether, No. 6 light gasoline or n-hexane.

7. The method for preparing Alpinia affine oil from Alpinia affine peel according to claim 1, characterized in that: The method for separating the extract in step (4) is any one of evaporation of solvent, sedimentation separation, centrifugation, filtration, microporous membrane filtration or ultrafiltration.