Method for efficiently extracting oil from palm oil avocado fibers

Abstract

The invention discloses a method for efficiently extracting oil from palm oil fruit fiber, and belongs to the technical field of palm oil extraction.According to the method, by-product palm oil fruit fiber generated in an existing process is treated through pretreatment and efficient extraction technologies, oil is further extracted on the basis of the existing process, and the palm oil fruit fiber is obtained. And the overall economic benefit of the palm oil fruit is obviously improved. The heating in the whole process is realized by utilizing excessive steam in the existing factory, and the extraction agent is recycled through the combination of the multi-stage separator and the condenser, so that the loss is extremely small, and the operation cost of the system is greatly reduced. By means of measures such as by-product reutilization, extraction agent recycling and tail gas treatment, the economic benefit is greatly improved and the efficient utilization of resources is effectively improved while the operation cost is controlled, the environmental protection target is achieved and the environmental pollution is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of palm oil extraction, and in particular relates to a method for efficiently extracting oil from palm oil fruit fibers. Background Art

[0002] Palm oil is an important source of edible and industrial oils, and its extraction process is of great significance for improving oil quality and reducing production costs. Traditional palm oil extraction methods mainly rely on pressing, but these methods can only squeeze out most of the oil in the palm fruit. Due to the requirements of the process and the limitations of existing pressing equipment, the oil in the palm fruit cannot be completely extracted, and there are problems such as low efficiency and large oil loss during the processing process. In addition, a large amount of steam in the production process of palm oil factories is currently directly discharged and treated, which results in a huge waste of heat.

[0003] Palm oil fiber is a byproduct of the palm fruit pressing process. It is mainly composed of lignin and cellulose, and contains a large amount of oil, usually 7% to 9%. Due to the lack of advanced technology and equipment, the waste oil cannot be effectively extracted and utilized. The current largest use of palm oil fiber is as boiler fuel, resulting in a huge waste of oil. Therefore, it is particularly important to develop a method and equipment that can efficiently and environmentally friendly extract palm oil from palm oil fiber. Summary of the invention

[0004] The object of the present invention is to provide a method for efficiently extracting oil from palm oil fruit fibers in order to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: a method for efficiently extracting oil from palm oil fruit fibers, comprising the following steps:

[0006] S1: Drying and homogenizing the fibers: Drying and homogenizing the palm oil fiber produced by the traditional pressing process, and ensuring the efficiency of subsequent material processing through pretreatment;

[0007] S2: Fiber extraction: first use the extractant preheater to increase the reagent temperature, and evenly spray to increase the material temperature in the high-efficiency fiber extractor to ensure the extraction efficiency. The gas discharged from the extractor is recovered by the extraction condenser;

[0008] S3: Fiber desolventizing: The wet fiber meal discharged from the bottom of the high-efficiency fiber extractor enters the extraction solvent separator, where it is heated and distilled by steam and hot air to remove the extractant. Part of the steam condenses in the fiber meal, which plays a role in destroying the enzyme activity in the fiber meal. The dried fiber meal can be collected and used as fuel, and the discharged mixed gas is recovered by the separation condenser;

[0009] S4: Liquid-mixed desolventizing: Separators at all levels are indirectly heated by steam, and the mixed oil collected from the fiber extractor is separated from the extractant and water through a multi-stage separator to improve the purity of the oil. The purified oil is finally sent to the crude oil tank and output as finished crude oil. The separated extractant and water enter the condensers at all levels in the form of gas for subsequent recovery;

[0010] S5: Recovering the extractant: The mixed gas of the extractant and water produced by the separator is liquefied into liquid after heat exchange in condensers at various levels, and enters the material balance tank, where it is allowed to stand and stratify. The extractant with a lower density flows from the upper part into the extraction solvent storage tank for recycling, which greatly reduces the loss of the extractant; the water with a higher density flows from the lower part into the cooking tank, and is discharged after the final cooking treatment;

[0011] S6: Tail gas treatment: The uncondensed gas coming out of the terminal condenser will have very little or no extractant left, and will enter the tail gas processor. After the tail gas absorption and tail gas separation process, the tail gas will meet the emission standards;

[0012] S7: Heating: The heating used in the whole process is carried out by the steam discharged from the existing palm oil mill itself, which greatly reduces the operating cost while achieving the desired effect. After that, the whole process of efficiently extracting oil from palm oil fruit fibers can be completed.

[0013] In a preferred embodiment, in step S1, the drying temperature is controlled at about 80°C for 2 hours to reduce the moisture content of the fiber to below 5%. The homogenization treatment is carried out by a mixer with a rotation speed controlled at 1000 rpm for 30 minutes to ensure that the fiber particles are uniform in size for subsequent extraction. The fibers after drying and homogenization should be loose without agglomeration, and the oil content should be controlled at about 10% to facilitate subsequent extraction agent penetration and oil dissolution.

[0014] In a preferred embodiment, in step S2, the material is transported in a uniformly rotating manner inside the high-efficiency fiber extractor to ensure the contact time and residence time of the material with the extractant in the container. After entering the high-efficiency fiber extractor, the homogenized and dried fiber is sprayed with a fiber extractant mixture of increasing concentrations, and before entering the draining section, it is sprayed with the fiber extractant again. The final wet fiber meal is discharged from the bottom of the high-efficiency fiber extractor for subsequent extraction solvent separation. The mixed oil composed of palm oil and the extractant is filtered and enters the mixed oil tank for subsequent purification.

[0015] In a preferred embodiment, in step S2, first, the extractant (such as n-hexane) is heated to about 50°C in an extractant preheater. Then, the preheated extractant is evenly sprayed on the palm oil fruit fiber in the high-efficiency fiber extractor through a spray device, so that its temperature is rapidly raised to about 40°C to improve the extraction efficiency. The material is transported in a uniform rotation manner inside the extractor, and the rotation speed is controlled at 20rpm to ensure that the contact time and residence time of the material with the extractant in the container are sufficient. The extraction process lasts for 1 hour to fully dissolve the oil in the fiber in the extractant. The weight ratio of the extractant to the fiber is controlled at about 1:2 to ensure sufficient dissolution of the oil and the extraction efficiency.

[0016] In a preferred embodiment, in step S3, the separator uses steam and hot air for heating and distillation, the temperature is controlled at about 90°C, and the pressure is controlled at 0.1MPa, so that the extractant is separated from the fiber. Part of the steam condenses in the fiber meal, which plays a role in destroying the enzyme activity in the fiber meal and preventing the fiber meal from spoiling during storage. The oil content of the dried fiber meal drops to less than 1%, and can be collected and used as fuel. The separator adopts a multi-layer structure inside to increase the contact area between steam and fiber meal and the desolventizing efficiency.

[0017] In a preferred embodiment, in step S4, the temperature of the separator is controlled at about 80°C and the pressure is controlled at 0.1MPa, so that the extractant and water are separated in the form of gas. The purity of the finally purified oil can reach more than 99%, and enters the crude oil tank as a finished crude oil output. The separated extractant and water enter the condensers at various levels in the form of gas for subsequent recovery. The separator adopts a multi-layer structure and is provided with baffles to improve the separation efficiency and oil purity.

[0018] In a preferred embodiment, in step S5, the temperature of the mixed gas of extractant and water produced by the separator is reduced to about 50°C after heat exchange through the first condenser, at which time most of the water condenses into liquid and is discharged from the bottom of the condenser. The remaining mixed gas enters the second condenser, and the temperature is further reduced to about 30°C. At this time, the remaining water and most of the extractant condense into liquid and are discharged from the bottom of the condenser. Finally, a very small amount of uncondensed gas enters the third condenser, and the temperature drops to about 20°C. At this time, the remaining extractant condenses into liquid and is discharged from the bottom of the condenser. The liquefied extractant and water mixed liquid enters the material balance tank, stands for stratification, and the extractant with lower density flows from the upper part into the extraction solvent storage reservoir for recycling, which greatly reduces the loss of the extractant. The water with higher density flows into the cooking tank from the lower part and is discharged after the final cooking process. A spiral tube structure is used inside the condenser to improve the heat exchange efficiency, and an automatic control system is provided to maintain a suitable temperature and pressure.

[0019] In a preferred embodiment, in step S6, the tail gas processor uses activated carbon adsorption and alkali solution absorption to remove harmful substances in the tail gas, so that the tail gas meets the emission standards and reduces environmental pollution. The activated carbon adsorption tower is filled with activated carbon, the filling amount is 1000kg, and an automatic control system is provided to maintain a suitable adsorption efficiency. The alkali solution absorption tower is filled with alkali solution, the alkali solution concentration is controlled at 10%, and an automatic control system is provided to maintain a suitable absorption efficiency.

[0020] In a preferred embodiment, in step S6, the content of harmful substances in the exhaust gas treated by the exhaust gas processor is lower than the national emission standard, such as the concentration of non-methane total hydrocarbons (NMHC) is lower than 100ppm, and the concentration of particulate matter is lower than 20mg / m 3 , SO2 concentration is less than 50mg / m 3 , NOx concentration is less than 100mg / m 3 The operating efficiency of the exhaust gas treatment system reaches over 95%, effectively ensuring the cleanliness and environmental protection of exhaust gas emissions.

[0021] In a preferred embodiment, in step S7, the steam pressure is controlled at 0.5 MPa and the temperature is controlled at about 150° C., which ensures the heating effect and greatly reduces the operating cost. The steam pipe is insulated with insulation material with a thickness of 50 mm to reduce heat loss.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] In the present invention, the palm oil fruit fiber, a byproduct produced by the existing process, is processed through pretreatment and high-efficiency extraction technology, and oil is further extracted on the basis of the existing process, which significantly improves the overall economic benefits of palm oil fruit. The heating in the whole process is achieved by using the excess steam of the existing factory, and the extractant is recycled through a combination of a multi-stage separator and a condenser, with minimal losses, which greatly reduces the operating cost of the system. Through measures such as by-product reuse, recycling and recycling of the extractant, and tail gas treatment, the present invention greatly improves economic benefits while controlling operating costs, achieving environmental protection goals, and reducing environmental pollution, and effectively improves the efficient use of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the process principle of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Reference Figure 1 ,

[0027] Example:

[0028] A method for efficiently extracting oil from palm oil fruit fibers comprises the following steps:

[0029] S1: Drying and homogenizing the fibers: Drying and homogenizing the palm oil fiber produced by the traditional pressing process, and ensuring the efficiency of subsequent material processing through pretreatment;

[0030] S2: Fiber extraction: first use the extractant preheater to increase the reagent temperature, and evenly spray to increase the material temperature in the high-efficiency fiber extractor to ensure the extraction efficiency. The gas discharged from the extractor is recovered by the extraction condenser;

[0031] S3: Fiber desolventizing: The wet fiber meal discharged from the bottom of the high-efficiency fiber extractor enters the extraction solvent separator, where it is heated and distilled by steam and hot air to remove the extractant. Part of the steam condenses in the fiber meal, which plays a role in destroying the enzyme activity in the fiber meal. The dried fiber meal can be collected and used as fuel, and the discharged mixed gas is recovered by the separation condenser;

[0032] S4: Liquid-mixed desolventizing: Separators at all levels are indirectly heated by steam, and the mixed oil collected from the fiber extractor is separated from the extractant and water through a multi-stage separator to improve the purity of the oil. The purified oil is finally sent to the crude oil tank and output as finished crude oil. The separated extractant and water enter the condensers at all levels in the form of gas for subsequent recovery;

[0033] S5: Recovering the extractant: The mixed gas of the extractant and water produced by the separator is liquefied into liquid after heat exchange in condensers at various levels, and enters the material balance tank, where it is allowed to stand and stratify. The extractant with a lower density flows from the upper part into the extraction solvent storage tank for recycling, which greatly reduces the loss of the extractant; the water with a higher density flows from the lower part into the cooking tank, and is discharged after the final cooking treatment;

[0034] S6: Tail gas treatment: The uncondensed gas coming out of the terminal condenser will have very little or no extractant left, and will enter the tail gas processor. After the tail gas absorption and tail gas separation processes, the tail gas will meet the emission standards;

[0035] S7: Heating: The heating used in the whole process is carried out by the steam discharged from the existing palm oil mill itself, which greatly reduces the operating cost while achieving the desired effect. After that, the whole process of efficiently extracting oil from palm oil fruit fibers can be completed.

[0036] In step S1, the drying temperature is controlled at about 80°C for about 2 hours to reduce the moisture content of the fiber to below 5%. The homogenization treatment is carried out by a mixer with a speed controlled at 1000rpm for about 30 minutes to ensure that the fiber particles are uniform in size for subsequent extraction. The fibers after drying and homogenization should be loose without agglomeration, and the oil content should be controlled at about 10% to facilitate subsequent extraction agent penetration and oil dissolution.

[0037] In step S2, the material is transported in a uniformly rotating manner inside the high-efficiency fiber extractor to ensure the contact time and residence time of the material with the extractant in the container. After entering the high-efficiency fiber extractor, the homogenized and dried fiber is sprayed with a fiber extractant mixture of increasing concentrations, and before entering the draining section, it is sprayed with the fiber extractant again. The final wet fiber meal is discharged from the bottom of the high-efficiency fiber extractor for subsequent extraction solvent separation. The mixed oil composed of palm oil and the extractant is filtered and enters the mixed oil tank for subsequent purification.

[0038] In step S2, first, the extractant (such as n-hexane) is heated to about 50°C in an extractant preheater. Then, the preheated extractant is evenly sprayed on the palm oil fruit fiber in the high-efficiency fiber extractor through a spray device, so that its temperature is rapidly raised to about 40°C to improve the extraction efficiency. The material is transported in a uniform rotation manner inside the extractor, and the rotation speed is controlled at 20rpm to ensure that the contact time and residence time of the material with the extractant in the container are sufficient. The extraction process lasts for about 1 hour, so that the oil in the fiber is fully dissolved in the extractant. The weight ratio of the extractant to the fiber is controlled at about 1:2 to ensure the full dissolution of the oil and the extraction efficiency.

[0039] In step S3, the separator uses steam and hot air for heating and distillation, the temperature is controlled at about 90°C, and the pressure is controlled at 0.1MPa, so that the extractant is separated from the fiber. Part of the steam condenses in the fiber meal, which plays a role in destroying the enzyme activity in the fiber meal and preventing the fiber meal from spoiling during storage. The oil content of the dried fiber meal drops below 1%, and can be collected and used as fuel. The separator adopts a multi-layer structure inside to increase the contact area between steam and fiber meal and the desolventizing efficiency.

[0040] In step S4, the temperature of the separator is controlled at about 80°C and the pressure is controlled at 0.1MPa, so that the extractant and water are separated in the form of gas. The purity of the finally purified oil can reach more than 99%, and enters the crude oil tank as a finished crude oil output. The separated extractant and water enter the condensers at various levels in the form of gas for subsequent recovery. The separator adopts a multi-layer structure and is provided with baffles to improve the separation efficiency and oil purity.

[0041] In step S5, the mixed gas of extractant and water produced by the separator is passed through the first condenser for heat exchange, and the temperature drops to about 50°C. At this time, most of the water condenses into liquid and is discharged from the bottom of the condenser. The remaining mixed gas enters the second condenser, and the temperature further drops to about 30°C. At this time, the remaining water and most of the extractant condense into liquid and are discharged from the bottom of the condenser. Finally, a very small amount of uncondensed gas enters the third condenser, and the temperature drops to about 20°C. At this time, the remaining extractant condenses into liquid and is discharged from the bottom of the condenser. The liquefied extractant and water mixed liquid enters the material balance tank, stands for stratification, and the extractant with lower density flows from the upper part into the extraction solvent storage reservoir for recycling, which greatly reduces the loss of the extractant. The water with higher density flows into the cooking tank from the lower part and is discharged after the final cooking treatment. The condenser adopts a spiral tube structure to improve the heat exchange efficiency, and is equipped with an automatic control system to maintain a suitable temperature and pressure.

[0042] In step S6, the exhaust gas processor removes harmful substances in the exhaust gas by means of activated carbon adsorption and alkali solution absorption, so that the exhaust gas meets the emission standards and reduces environmental pollution. The activated carbon adsorption tower is filled with activated carbon, the filling amount is about 1000kg, and an automatic control system is provided to maintain a suitable adsorption efficiency. The alkali solution absorption tower is filled with alkali solution, the alkali solution concentration is controlled at 10%, and an automatic control system is provided to maintain a suitable absorption efficiency.

[0043] In step S6, the content of harmful substances in the exhaust gas treated by the exhaust gas processor is lower than the national emission standards, such as the concentration of non-methane hydrocarbons (NMHC) is lower than 100ppm, and the concentration of particulate matter is lower than 20mg / m 3 , SO2 concentration is less than 50mg / m 3 , NOx concentration is less than 100mg / m 3 The operating efficiency of the exhaust gas treatment system reaches over 95%, effectively ensuring the cleanliness and environmental protection of exhaust gas emissions.

[0044] In step S7, the steam pressure is controlled at 0.5MPa and the temperature is controlled at about 150°C, which ensures the heating effect and greatly reduces the operating cost. The steam pipe is insulated with insulation material with a thickness of about 50mm to reduce heat loss.

[0045] Test example:

[0046] The above process was used to process palm oil fruit fiber produced by a palm oil factory in Malaysia. The final results are as follows:

[0047] project Oil content of fiber raw materials Oil yield of treated fiber Oil content of treated fiber Extraction agent loss data 8.27％ 7.28％ 0.99％ 1.64％

[0048] It can be seen from the test examples that the data obtained by using the process proposed by the present invention prove that the oil content in the fiber is significantly reduced from 8.27% to 0.99% after the above process treatment; the amount of oil obtained is as high as 7.28% of the fiber feed weight. In addition, the loss of the extractant is very small, only 1.64%, which proves that the technology of the present invention is effective and feasible and can create huge economic value.

[0049] From the above, it can be known that: in the present invention, the palm oil fruit fiber, a by-product produced by the existing process, is processed through pretreatment and high-efficiency extraction technology, and oil is further extracted on the basis of the existing process, which significantly improves the overall economic benefits of palm oil fruit. The heating in the whole process is realized by using the excess steam of the existing factory, and the extractant is recycled through a combination of a multi-stage separator and a condenser, with minimal losses, which greatly reduces the operating cost of the system. Through measures such as by-product reuse, recycling of the extractant, and tail gas treatment, the present invention greatly improves the economic benefits while controlling operating costs, achieving environmental protection goals, and reducing environmental pollution, and effectively improves the efficient use of resources.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0051] The above description enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for efficiently extracting oil from palm oil fruit fibers, characterized in that: The steps include: S1: Drying and homogenizing the fibers: Drying and homogenizing the palm oil fiber produced by the traditional pressing process, and ensuring the efficiency of subsequent material processing through pretreatment; S2: Fiber extraction: first use the extractant preheater to increase the reagent temperature, and evenly spray to increase the material temperature in the high-efficiency fiber extractor to ensure the extraction efficiency. The gas discharged from the extractor is recovered by the extraction condenser; S3: Fiber desolventizing: The wet fiber meal discharged from the bottom of the high-efficiency fiber extractor enters the extraction solvent separator, where it is heated and distilled by steam and hot air to remove the extractant. Part of the steam condenses in the fiber meal, which plays a role in destroying the enzyme activity in the fiber meal. The dried fiber meal can be collected and used as fuel, and the discharged mixed gas is recovered by the separation condenser; S4: liquid-mixed desolventizing: the separators at each stage are indirectly heated by steam, and the mixed oil collected from the fiber extractor is separated from the extractant and water through a multi-stage separator to improve the oil purity, and the purified oil finally enters the crude oil tank as a finished crude oil output; the separated extractant and water enter the condensers at each stage in the form of gas for subsequent recovery; S5: Recovering the extractant: The mixed gas of the extractant and water produced by the separator is liquefied into liquid after heat exchange in condensers at various levels, and enters the material balance tank, where it is allowed to stand and stratify. The extractant with a lower density flows from the upper part into the extraction solvent storage tank for recycling, which greatly reduces the loss of the extractant; the water with a higher density flows from the lower part into the cooking tank, and is discharged after the final cooking treatment; S6: Tail gas treatment: The uncondensed gas coming out of the terminal condenser will have very little or no extractant left, and will enter the tail gas processor. After the tail gas absorption and tail gas separation process, the tail gas will meet the emission standards; S7: Heating: The heating used in the whole process is carried out by the steam discharged from the existing palm oil mill itself, which greatly reduces the operating cost while achieving the desired effect. After that, the whole process of efficiently extracting oil from palm oil fruit fibers can be completed.

2. A method for efficiently extracting oil from palm oil fruit fibers as claimed in claim 1, characterized in that: In the step S1, the drying temperature is controlled at 80°C and the drying time is 2 hours, so that the moisture content of the fiber is reduced to below 5%; the homogenization treatment is carried out by a mixer, the speed is controlled at 1000rpm, and the time is 30 minutes to ensure that the fiber particles are uniform in size and convenient for subsequent extraction; the fibers after drying and homogenization should be loose, without agglomeration, and the oil content is controlled at 10% to facilitate the subsequent extraction agent penetration and oil dissolution.

3. The method for efficiently extracting oil from palm oil fruit fibers according to claim 1, characterized in that: In step S2, the material is transported in a uniformly rotating manner inside the high-efficiency fiber extractor to ensure the contact time and residence time of the material with the extractant in the container; the homogenized and dried fiber is sprayed with a fiber extractant mixture of increasing concentrations after entering the high-efficiency fiber extractor, and is sprayed with the fiber extractant again before entering the draining section. The final wet fiber meal is discharged from the bottom of the high-efficiency fiber extractor for subsequent extraction solvent separation; the mixed oil composed of palm oil and the extractant is filtered and enters the mixed oil tank for subsequent purification.

4. The method for efficiently extracting oil from palm oil fruit fibers according to claim 1, characterized in that: In the step S2, first, the extractant n-hexane is heated to 50° C. in an extractant preheater; then, the preheated extractant is evenly sprayed on the palm oil fruit fiber in the high-efficiency fiber extractor through a spray device to quickly raise its temperature to 40° C. to improve the extraction efficiency; the material is transported in a uniform rotation manner inside the extractor, and the rotation speed is controlled at 20 rpm to ensure that the contact time and residence time of the material with the extractant in the container are sufficient; the extraction process lasts for 1 hour to fully dissolve the oil in the fiber in the extractant; the weight ratio of the extractant to the fiber is controlled at 1:2 to ensure the full dissolution of the oil and the extraction efficiency.

5. The method for efficiently extracting oil from palm oil fruit fibers according to claim 1, characterized in that: In step S3, the separator uses steam and hot air for heating and distillation, and the temperature is controlled at 90°C; the pressure is controlled at 0.1MPa to separate the extractant from the fiber; part of the steam condenses in the fiber meal, which plays a role in destroying the enzyme activity in the fiber meal and preventing the fiber meal from spoiling during storage; the oil content of the dried fiber meal drops to less than 1%, and can be collected and used as fuel; the separator adopts a multi-layer structure inside to increase the contact area between steam and fiber meal and the desolventizing efficiency.

6. The method for efficiently extracting oil from palm oil fruit fibers according to claim 1, characterized in that: In step S4, the temperature of the separator is controlled at 80° C., and the pressure is controlled at 0.1 MPa, so that the extractant and water are separated in the form of gas. The purity of the purified oil can reach more than 99%, and enters the crude oil tank to be produced as finished crude oil. The separated extractant and water enter the condensers at various levels in the form of gas for subsequent recovery. The separator adopts a multi-layer structure and is provided with baffles to improve the separation efficiency and oil purity.

7. The method for efficiently extracting oil from palm oil fruit fibers according to claim 1, characterized in that: In the step S5, the temperature of the mixed gas of the extractant and water produced by the separator is reduced to 50°C after heat exchange in the first-stage condenser; at this time, most of the water condenses into liquid and is discharged from the bottom of the condenser; the remaining mixed gas enters the second-stage condenser, and the temperature is further reduced to 30°C; at this time, the remaining water and most of the extractant condense into liquid and are discharged from the bottom of the condenser; finally, a very small amount of uncondensed gas enters the third-stage condenser, and the temperature is reduced to 20°C; at this time, the remaining extractant condenses into liquid and is discharged from the bottom of the condenser; the liquefied extractant and water mixed liquid enters the material balance tank, stands and decomposes, and the extractant with lower density flows from the upper part into the extraction solvent storage tank for recycling, which greatly reduces the loss of the extractant; the water with higher density flows from the lower part into the cooking tank and is discharged after the final cooking treatment; the condenser adopts a spiral tube structure to improve the heat exchange efficiency, and is provided with an automatic control system to maintain a suitable temperature and pressure.

8. The method for efficiently extracting oil from palm oil fruit fibers as claimed in claim 1, characterized in that: In step S6, the exhaust gas processor adopts activated carbon adsorption and alkali solution absorption to remove harmful substances in the exhaust gas, so that the exhaust gas meets the emission standards and reduces environmental pollution; the activated carbon adsorption tower is filled with activated carbon, the filling amount is 1000kg, and an automatic control system is provided to maintain a suitable adsorption efficiency; the alkali solution absorption tower is filled with alkali solution, the alkali solution concentration is controlled at 10%, and an automatic control system is provided to maintain a suitable absorption efficiency.

9. The method for efficiently extracting oil from palm oil fruit fibers according to claim 1, characterized in that: In step S6, the content of harmful substances in the exhaust gas treated by the exhaust gas processor is lower than the national emission standard, wherein the concentration of non-methane total hydrocarbons (NMHC) is lower than 100 ppm, and the concentration of particulate matter is lower than 20 mg / m 3 , SO2 concentration is less than 50mg / m 3 , NOx concentration is less than 100mg / m 3 The operating efficiency of the exhaust gas treatment system reaches over 95%, effectively ensuring the cleanliness and environmental protection of exhaust gas emissions.

10. The method for efficiently extracting oil from palm oil fruit fibers according to claim 1, characterized in that: In step S7, the steam pressure is controlled at 0.5 MPa and the temperature is controlled at 150° C., which ensures the heating effect and greatly reduces the operating cost; the steam pipe is insulated with insulation material, and the thickness of the insulation material is 50 mm.

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