JPH08257545A - Method for concentrating waste liquid of palm oil and concentrated liquid of waste liquid of palm oil - Google Patents

Abstract

PURPOSE: To solve the problems of pollution or the like, to reduce the space and cost required for transportation and storage, to concentrate a waste liquid of palm oil to a high concn. and to improve the preservable property of concentrate by adding and mixing natural rubber sera to and with the waste liquid of the palm oil, then concentrating the liquid.

CONSTITUTION: To concentrate the waste liquid (waste liquid of the palm oil) discharged at the time of producing palm oil from the coconuts of oil palms to the high concn. by suppressing the decomposition of the respective content components, the waste liquid of the palm oil is concd. after the natural rubber sera are added and mixed to and with the waste liquid. At this time, the concn. is executed by reduced pressure concn. under conditions of ≤99°C and negative pressure of ≥600 mmHg. For example, the liquid mixture composed of the waste liquid of the palm oil and the natural rubber sera is introduced from the line F and is circulated in a circulation route consisting of a pump 70, a heat exchanger 72 and a separator 74. The liquid mixture is heated to a prescribed temp. to evaporate part of the moisture and the evaporated mixture is captured as vapor (sucked into an aspirator 82), by which the liquid mixture is concd. The water drops contg. solid contents are separated (concd.) and are returned into the circulation route.

COPYRIGHT: (C)1996,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention significantly suppresses the decomposition of the components contained in the waste liquid (palm oil waste liquid) discharged during the production of palm oil from the fruit of oil palm (Elaeis guineensis). And a concentrated solution. More specifically, the present invention relates to a method for concentrating palm oil effluent and a condensate for preventing the environmental pollution due to palm oil effluent in a country producing palm oil and enabling effective use of conventionally discarded palm oil effluent. .

[0002]

2. Description of the Related Art Palm oil obtained from oil palm fruits (palm oil) is myristic acid, palmitic acid,
It contains various active ingredients such as stearic acid, oleic acid, and linoleic acid, and is used for various purposes such as soap, food, candles, and cosmetics.

The effluent discharged from the palm oil manufacturing process (hereinafter referred to as palm oil effluent) is an organic compound such as protein, sugar, amino acid, or phosphorus, potassium, magnesium, calcium or the like. It is known that various kinds of inorganic components are contained, but the palm oil drainage has no particular use in the past, and most of it is currently discarded. It is also known that palm oil effluent is effective as a fertilizer for oil palm, but it is not widely used because the fertilizer component is diluted.

Disposal of palm oil drainage is carried out by throwing palm oil drainage into a pond for disposal to decompose it anaerobically and aerobically and then discarding it in a river or the like. However,
This disposal method requires a vast amount of land, and also causes various odors due to odors due to decomposition in the decomposition process in the pond, and produces methane gas that destroys the ozone layer due to decomposition. There is. Moreover, even the drainage after being decomposed in the pond often does not meet the environmental standards for discarding, which causes pollution of the river.

[0005]

In order to solve such problems, Japanese Patent Laid-Open Nos. 55-51476 and 2-9875 disclose a technique for treating palm oil drainage, which includes palm oil drainage. Technology to dry and incinerate and use for feed etc.,
A technique for producing tocopherol, tocotrienol and the like by performing a pretreatment is disclosed. However,
In these methods, most of the active ingredients of palm oil effluent are decomposed during drying, and it cannot be said that the ingredients contained in the effluent are efficiently used, and the treatment is also labor-intensive. It takes.

Further, by concentrating the palm oil effluent under reduced pressure, it is possible to obtain a concentrate effective for fertilizer raw materials and the like.
However, the concentrate of palm oil effluent tends to have a high viscosity, resulting in problems in handling and processability thereafter, and
Depending on the device, there is a limit to concentration by increasing the viscosity, so
The solid content can be concentrated up to about 25% by weight. Further, depending on the storage conditions (high temperature, high humidity, etc.), it easily rots and there is a problem in storage stability.

An object of the present invention is to solve the above-mentioned problems of the prior art, and there is no problem of pollution such as pollution of rivers and air, and to greatly reduce the space and cost required for transportation and storage. Not only can palm oil drainage be concentrated to a high concentration at low cost, but the concentrate also has excellent shelf life, and palm oil drainage can be used more effectively. It is intended to provide a method for concentrating a liquid and a concentrated liquid obtained by this concentrating method.

[0008]

In order to achieve the above object, the present invention provides a method for concentrating palm oil effluent, which comprises adding natural rubber serum to palm oil effluent, mixing and concentrating. provide.

Further, the concentration is carried out at 99 ° C. or lower, a negative pressure of 600
Concentration under reduced pressure under conditions of mmHg or higher is preferred.

The present invention further provides a palm oil effluent concentrate obtained by the above-mentioned concentration method.

The method for concentrating palm oil drainage and the palm oil drainage concentrate according to the present invention will be described in detail below. Concentration method of palm oil drainage of the present invention (hereinafter referred to as concentration method)
Is a effluent (palm oil effluent) that is discharged in the process of manufacturing palm oil, etc., starting from oil palm fruit (bunch fresh fruit bunch = FFB having oil palm fruit and flower prunus). Concentrate some or all of this by adding and mixing natural rubber serum and concentrating it, preferably by concentrating under reduced pressure to distill off water, etc. from this mixture and concentrate the palm oil effluent (hereinafter , A concentrated solution). First, the palm oil drainage concentrated by the present invention will be described.

FIG. 1 shows a flowchart of an example of a manufacturing process for manufacturing palm oil (and palm kernel) from FFB. As shown in FIG. 1, the FFB collected from the oil palm tree is first put into a steamer and steamed at 150 ° C.,
It is steamed for about 1 hour and 30 minutes under the condition of about 40 psi.
At this time, a condensate is generated and becomes drainage, which is the palm oil drainage to be concentrated in the present invention. In addition, this condensate is 100
It usually has a solid content of about 4 to 6% by weight at a temperature of about C and contains inorganic components such as phosphorus, sulfur and potassium, amino acids, proteins, fats and oils, vitamins and the like.

[0013] The steamed FFB is then separated by a stripper (or sheller) into oil palm fruits and flower stalks, and the core is removed from the oil palm fruits by a digester, and palm oil is contained by a press. Liquid components are squeezed. The juice is sent to the palm oil manufacturing process, and the residue is sent to the palm kernel manufacturing process.

The squeezed juice is first sludge-removed by a vibrating screen and then stored in a settling tank, whereby it is separated into a light fraction and a heavy fraction, that is, an oil fraction and a water fraction, due to a difference in specific gravity. The oil (crude oil) is further refined by removing water from the refiner and dried in a vacuum dryer to obtain palm oil.

On the other hand, sludge is removed from the water fraction by a sand remover, oil is further collected by a centrifuge, and the rest is discharged. This drainage liquid is also the palm oil drainage liquid to be concentrated in the present invention. Although most of the palm oil serum is contained in this drainage, water is generally added to treat the juice and the precipitation tank. This palm oil drainage is 90
It usually has a solid content of about 2 to 6% by weight at a temperature of about C and contains inorganic components such as phosphorus, sulfur and potassium, amino acids, proteins, fats and oils, vitamins and the like. The oil content collected by the centrifuge is returned to the settling tank and subjected to the same process.

On the other hand, the residue (solid content) obtained by the press
First, the fiber component is removed by a nut fiber separator, dried by a drier, and then crushed by a crusher, and impurities such as dust and lightweight fruit husks are removed in a blowing tower. Next, while being separated into a shell and a palm core by a hydrocyclone,
To be washed with water. Therefore, although drainage also comes out from the hydrocyclone, this drainage is also palm oil drainage to be concentrated in the present invention. This palm oil effluent usually has a solid content of about 0.5 to 4% by weight at a temperature of about 90 ° C. and contains inorganic components such as phosphorus, sulfur and potassium, amino acids, proteins and the like. is there.

The palm kernel obtained by the hydrocyclone is dried by a kernel dryer to obtain a palm kernel. In addition, palm kernel oil and palm kernel feed are obtained from the palm kernel, and the palm kernel oil is further used for manufacturing soap, margarine, confectionery, ice cream, cosmetics and the like.

The concentration method of the present invention is not limited to only the drainage discharged in such a manufacturing process, and the drainage discharged after further removing oil from each drainage described above. For example, the above-mentioned various drainages may be drained after being subjected to various treatments. FIG. 2 conceptually shows an example of a method for treating the waste liquid discharged in the above palm oil production process.

In FIG. 2, reference numeral 50 designates the above-mentioned steaming pot,
Reference numeral 52 is a centrifuge, and reference numeral 54 is a hydrocyclone. The effluent discharged from the steamer 50 and the centrifuge 52 is collected in a common pit 56, is sent to the decanter tank 58 from this pit 56, and is separated into light and heavy components by specific gravity, Light components, that is, oil components, are collected, and heavy components are sent to the sludge pit 60. On the other hand, the drainage discharged from the hydrocyclone 54 is directly sent to the sludge pit 60.

In the sludge pit 60, after the oil is further recovered from the drainage, the drainage is sent to the recovery pit 62. With the recovery pit 62, the difference in specific gravity is used,
In the equipment for further recovering the oil content from the waste fluid, the waste fluid in which the oil content has been recovered in the recovery pit 62 is discharged as the final waste fluid. This final drainage liquid is also the palm oil drainage liquid to be concentrated in the present invention. This final effluent usually has a solid content of about 4 to 5% by weight at a temperature of about 65 ° C. and contains inorganic components such as phosphorus, sulfur and potassium, amino acids, proteins, fats and oils, vitamins and the like. Is.

In the present invention, the final effluent discharged by other treatment methods may be concentrated, or the effluent discharged during the treatment may be concentrated. That is, the concentration method of the present invention is capable of concentrating all the effluent that is related to the palm oil production process and is expected to contain the components contained in FFB.

The concentration method of the present invention uses natural rubber serum (Na solution) as the drainage discharged in connection with the production of such palm oil.
tural rubber serum) is added and mixed and concentrated, preferably 99 ° C or less, negative pressure 600 mmHg (gauge pressure -600 mm
Hg) It is concentrated under reduced pressure under the above conditions. Natural rubber such as RRS (ribbed smoked sheet) and brown crepe are rubber trees (Hevea brasiliensis)
white emulsion (natural rubber latex = skim latex) obtained from iensis) is diluted with water to remove dust and the like, and acids such as sulfuric acid, acetic acid and formic acid are added as a coagulant to coagulate the rubber component. The rubber component is dehydrated, dried, and then smoked and the like to be manufactured. The natural rubber serum is an aqueous solution remaining after the coagulating agent is added to the natural rubber latex and the coagulated rubber is removed in the production of such natural rubber.

As described above, the palm oil waste liquid tends to have a high viscosity when concentrated, so that it can be concentrated only up to a solid content of about 25% by weight, and there is a problem in the storability of the concentrated liquid. On the other hand, the natural rubber serum can be concentrated to a relatively high concentration (high solid content) by vacuum concentration, as shown in Japanese Patent Application Laid-Open No. 3-70702 by the present applicant, and the solid content is high. If the concentrate has a content (hereinafter, referred to as a solid content concentration) of 30 to 80% by weight, particularly a solid content concentration of 70% by weight or less, the viscosity is easy to handle, the processability is good, and it is not easily decomposed. Since it has good storage stability, it can be suitably used as a raw material for fertilizers, rubber vulcanization accelerators, cosmetics and the like. However, the vacuum concentration has a problem that the energy cost is higher than that of other concentration methods.

The present inventors have conducted intensive studies on a method of concentrating palm oil drainage to a higher solid content concentration to enable more effective utilization, and as a result, added natural rubber serum to palm oil drainage. -By mixing and concentrating, it was found that the viscosity increase of palm oil drainage due to concentration can be suitably prevented and the concentration can be increased to a high solid content concentration. Moreover, as described above, the palm oil drainage has a relatively high temperature, and in the palm oil manufacturing plant, the fiber components and the palm palm fruit grains produced as a by-product during the palm oil manufacturing process are extracted. Since steam energy obtained by combustion and electric power using this steam energy are used for the production of palm oil, by concentrating the mixed liquid at the palm oil factory, excess energy and palm oil waste liquid are removed. Since the concentration cost can be significantly reduced by utilizing the temperature and the concentrate can be produced at a low cost, the cost problem caused by the concentration of the natural rubber serum can be solved.

In the concentration method of the present invention, the mixing ratio of palm oil drainage and natural rubber serum is not particularly limited, but it is easy to handle and concentrate, and can be concentrated in a short time. In terms of obtaining a concentrated solution with a high concentration,
The volume ratio of palm oil drainage and natural rubber serum is preferably in the range of palm oil drainage / natural rubber serum = 10/1 to 1/10, and palm oil drainage / natural rubber serum = 1/1 to 1/3. Is more preferable. In general, the higher the ratio of natural rubber serum, the faster the concentration of the solid content of the concentrated liquid can be obtained.

In the concentration method of the present invention, the palm oil drainage and the natural gum serum are not limited to being used as they are, and a palm oil drainage and / or a concentrate of the natural gum serum may be used. When using a concentrate, in terms of handling (viscosity), etc., the palm oil waste liquid concentrate is a concentrate having a solid content concentration of less than 25% by weight, and the natural rubber serum concentrate is a solid content concentration of 70% by weight. It is preferred to utilize less than each of the concentrated solutions.

In the concentration method of the present invention, the method for concentrating the mixture of palm oil drainage and natural rubber serum is not particularly limited, and any known liquid concentration method can be used. In particular, it is preferable that the concentration is performed under reduced pressure at a temperature of 99 ° C. or less and a negative pressure of 600 mmHg or more. By performing the concentration under the above conditions, preferable results are obtained in terms of prevention of decomposition of the active ingredient, energy efficiency, durability of the pressure reducing device, ability of the pressure reducing device, time efficiency, and the like. More preferably, the temperature is 80 to 95 ° C., the negative pressure is 610 to 750 mmHg, and the concentration is more preferably 84 to 95 ° C. and the negative pressure is 610 to 750 mmHg. More preferable results are obtained in terms of the capacity of the device, the durability of the pressure reducing device, the time efficiency, and the like.

As described above, the palm oil drainage liquid is generally at a high temperature (usually 60 to 100 ° C.), and the concentration can utilize the surplus energy in the production of palm oil or the surplus power of private power generation. . Therefore, the amount of energy newly added for concentrating the mixed solution is extremely small, and the concentration can be performed at low cost. As surplus energy in the production of usable palm oil, steam energy generated by burning the fruit of palm palm in the palm oil factory mentioned above, electric energy generated using the steam, currently unused However, thermal energy generated when burning the bunch is exemplified.

In the concentration method of the present invention, the solid content concentration of the concentrated liquid (concentrated liquid of the present invention) to be produced is appropriately determined depending on the mixing ratio of palm oil waste liquid and natural rubber serum, the solid content concentration of both, and the like. It is determined and is not particularly limited, but is usually about 20 to 80% by weight, preferably about 35 to 70% by weight. By setting the concentration of the solid content of the concentrated liquid in the above range, the amount of the concentrated liquid can be significantly reduced compared to the undiluted liquid, and the cost such as space and transportation cost can be greatly reduced. In addition to being able to fully exert the merits obtained by concentration such as properties, it is easy to handle and does not easily rot, and favorable results can be obtained in terms of storage and processing. Although the thixotropy of the concentrated liquid increases and the fluidity decreases as the concentration progresses, if it is within the above range, no major problems occur in the processability such as granulation and addition of compounds.

The concentrated liquid of the present invention contains various components contained in palm oil drainage and natural rubber serum, and is used as a raw material for fertilizers and feeds, food additives, cosmetics, and chemical products. It is preferably used as a raw material of. Since this concentrated liquid has an appropriate amount of water, it is not necessary to add water for granulation when it is made into powder (powder or granules), and depending on the application, insufficient components (eg, , If it is a fertilizer, chemical components such as nitrogen, phosphoric acid, potassium, magnesium, etc.)
It is possible to directly add / dissolve and granulate to produce a product, and it is possible to easily and effectively measure the cost.

The components contained in the concentrate of the present invention cannot be strictly defined because they differ depending on the palm oil drainage and natural rubber serum used, but nitrogen compounds, phosphate compounds, potassium compounds, calcium compounds, Various inorganic components such as magnesium compounds, ammonium salts such as ammonium sulfate, glutamic acid, aspartic acid, arginine, lysine, histidine, phenylalanine, tyrosine, leucine, isoleucine, methionine, valine,
Alanine, glycine, proline, serine, threonine,
It contains amino acids such as tryptophan and cystine, various proteins such as α-globulin and hevein, and various organic components such as fatty acids such as lauric acid and palmitic acid.
The content of each component also differs depending on the palm oil effluent or natural rubber serum used, so it cannot be specified exactly, but normally, in dry weight, the total amount of nitrogen is about 2 to 9% by weight, and the total amount of phosphoric acid is Is about 0.5 to 2% by weight, and the total amount of potassium is about 4 to 7% by weight.

As the concentrating device (equipment) that can be used in the concentrating method of the present invention, any concentrating device known in the art, particularly any device capable of heating under reduced pressure can be used, and known concentrating devices such as vacuum evaporators. All known concentrators such as an (evaporator) and a distillation apparatus such as a distillation column can be used.

FIG. 3 shows a schematic view of an example of a concentrating device for carrying out the concentrating method of the present invention. In the concentrating device of the illustrated example, a mixed liquid of palm oil waste liquid and natural rubber serum (hereinafter referred to as a mixed liquid) is introduced into the concentrating device from a line F, and a pump 70, a heat exchanger (heat exchanger) 72 and a separator. A pump 70 circulates through a circulation path composed of (gas-liquid separator) 74. The heat exchanger 72 is heated to a predetermined temperature by circulating hot water in the hot water tank 76, which is heated by steam, with a pump 78. On the other hand, an aspirator 82 is connected to the separator 74 via a mist separator 80, and the pressure inside the separator 74 (circulation path) is reduced. Reference numeral 84 is a circulation pump for the aspirator 82, and reference numeral 86 is a tank for storing circulating water and water distilled from palm oil drainage.

In the apparatus shown in FIG. 3, the mixed solution introduced into the system is heated to a predetermined temperature in the heat exchanger 72 while being circulated, and a part of the water content contained in the mixed solution is stored in the separator 74. By evaporating and being collected as vapor (suctioned by the aspirator 82),
The mixture is concentrated. The water droplet (mist) containing the solid content collected together with the vapor is separated (condensed) by the mist separator 80 and is returned to the circulation system. When the concentration of the mixed liquid is completed, the concentrated liquid is collected from the line C. The mixed solution may be supplied from the line F continuously or batchwise depending on the internal volume of the circulation system.
Alternatively, it may be a batch-type process.

FIG. 4 shows a schematic view of another example of a concentrating device for carrying out the concentrating method of the present invention. The apparatus shown in FIG. 4 has the same configuration as the concentrating apparatus shown in FIG. 3 except that the depressurizing method (circulation path) of the separator 74 is different. Therefore, the same members are designated by the same reference numerals. , The explanation is mainly about different parts.

In the concentrating device shown in FIG. 4, the mixed liquid is heated by the heat exchanger 72 while being circulated through the circulation path consisting of the pump 70, the heat exchanger 72 and the separator 74, as in the device shown in FIG. It Here, in the example shown in FIG. 3, the pressure is reduced by sucking the separator 74 with the aspirator 82, but in the apparatus shown in FIG. 4, the pressure of the separator 74 is reduced by the vacuum pump 90.
Part of the water content of the circulated liquid mixture is evaporated to collect the vapor for concentration. A condenser 92 is disposed in the middle of the depressurization path from the vacuum pump 90 to the separator 74, and the condenser 92 is cooled by a cooler 96 and cooled by a refrigerant circulated by a pump 94. Therefore, the vapor evaporated in the separator 74 is cooled and condensed in the condenser 92 and discharged as the condensed water W.

FIG. 5 shows a schematic view of another example of the concentrating device for carrying out the concentrating method of the present invention. In FIG. 5, the solid line indicates the flow of the mixed liquid and the (coarse) concentrated liquid, the broken line indicates the flow of the heating steam and the drain, and the alternate long and short dash line indicates the control system (electric system) such as the valve and the pump. . The concentration device 10 shown in FIG.
, A first evaporator 14, a second evaporator 16, a third evaporator 18, and a steam generator 2 for generating steam which is a condensing heating source.
2, a vapor-liquid separator 20, 30 and 36 for separating mist, condensate and the like from heating vapor and vaporized vapor, and a pressure reducing device having a vacuum pump VP. 2 evaporators 16, 3rd evaporators 18, gas-liquid separator 2
0, 30 and 36 are depressurized to a predetermined value by the depressurizing device and kept.

In the concentrating device 10, the mixed solution is stored in the stock solution storage tank 12. To the jacket 12a of the stock solution storage tank 12, waste steam that has heated each evaporator is supplied to preheat the mixed solution. The mixed solution is then fed into the stock solution supply tank 24.
To the first evaporator 14 by pump 13
Is supplied to. Here, the mixed liquid is heated as its transport pipe passes through the third evaporator 18, the second evaporator 16 and the first evaporator 14 in the route up to the supply to the first evaporator 14. And is supplied to the first evaporator 14 from the top of the tower.

The first evaporation can 14 has a large number of small-diameter pipes vertically arranged in the can, and the inside of the can is predetermined by the steam generated in the steam generator 22 and supplied from the steam booster 26. It is heated to the temperature of. The mixed liquid supplied from the top of the first evaporator 14 flows down along the wall of the internal pipe, and during that time, it is concentrated under reduced pressure and accumulates on the bottom of the can. The crude concentrate collected in the bottom of the can is circulated from the bottom of the can to the top of the tower by the pump 28. Here, at the bottom of the first evaporating can 14, there is a level meter 14 interlocking with the valve 28a.
L is arranged, and when the level meter 14L detects that a predetermined amount of the crude concentrated liquid has accumulated in the bottom of the first evaporator 14, the valve 28a opens and the crude concentrated liquid is pumped by the pump 28. It is sent to the second evaporator 16.

On the other hand, the steam as a heating source supplied from the steam booster 26 to the first evaporator 14 enters the gas-liquid separator 30 together with the steam generated from the mixed liquid, and only the pure steam is used as a heating source for the second evaporator. 16 are supplied. The condensed liquid, the mist of the mixed liquid, and the like separated in the gas-liquid separator 30 are pumped together with the concentrated liquid by the pump 28.
Sent to

The second evaporation can 16 has the same structure as the first evaporation can 14, and the inside of the can is heated by the steam supplied from the gas-liquid separator 30. The crude concentrate supplied from the tower top to the second evaporator 16 by the pump 28 is further concentrated under reduced pressure in the same manner as the first evaporator 14 and collected at the bottom of the can, and circulated by the pump 32. The second evaporator 16 is also provided with a level meter 16L interlocking with the valve 32a, and when it is detected that a predetermined amount of crude concentrated liquid has accumulated at the bottom of the can, the valve 32a is opened and the pump 32 is pumped.
As a result, the crude concentrated liquid is sent into the circulation path 34 including the third evaporator 18 and the gas-liquid separator 20.

On the other hand, the vapor supplied to the second evaporator 16 is sent to the gas-liquid separator 36 together with the vapor generated from the concentrated liquid as in the case of the first evaporator 14, and only the pure vapor is supplied to the third evaporator 18. Is supplied to. In the illustrated example, excess steam for heating the third evaporator 18 is configured to return to the steam booster 26. Further, the mist of the condensed liquid and the concentrated liquid separated in the gas-liquid separator 36 is sent to the circulation path 34 by the pump 32.

The crude concentrated liquid sent to the circulation path 34 is heated by the steam sent from the gas-liquid separator 36 while being circulated between the third evaporator 18 and the gas-liquid separator 20 by the pump 37a. It is heated in the third evaporator 18 thus prepared and concentrated under reduced pressure until a concentrated solution having a predetermined solid content concentration is obtained. In addition, the circulation path 34 is provided with a solid content concentration meter 38 interlocking with a valve 26a arranged immediately in front of the steam booster 26, and the amount of vapor supplied according to the solid content concentration of the concentrated liquid circulating in the circulation path 34. Is configured to control.

The gas-liquid separator 20 is provided with a level meter 20L linked with a pump 37b and a valve 37c for transportation to the product storage tank 40, and a concentrated liquid having a predetermined solid content concentration is supplied in a predetermined amount. When it is detected that the liquid is accumulated in the liquid separator 20, the valve 37c is opened and the pump 37b is driven,
The concentrated liquid is transported to the product storage tank 40.

Steam (condensed water) that heats the third evaporator 18
Is sent to the drain tank 42 by the pump 41. Here, in the concentration device 10 of the illustrated example, the drain tank 4
A part of the waste steam entering 2 is stored in the stock solution storage tank 1 as described above.
It is supplied to the second jacket 12a to preheat the mixed liquid.

Although the method for concentrating palm oil effluent and the concentrated solution according to the present invention have been described above in detail, the present invention is not limited to the above-mentioned examples, and various improvements can be made without departing from the scope of the present invention. Of course, changes may be made.

[0047]

EXAMPLES The present invention will be described in more detail below by showing specific examples of a method for concentrating palm oil waste liquid and a concentrated solution according to the present invention.

Example 1 Palm oil effluent discharged from the centrifuge in the process of producing palm oil and natural rubber latex obtained from a rubber tree were coagulated by adding sulfuric acid to the coagulated rubber component. The natural rubber serum obtained by removing the mixture was mixed at a volume ratio of palm oil drainage / natural rubber serum = 1/1 to obtain a mixed liquid. The solid content concentration of the mixed solution was 3.2% by weight. This mixed solution is negative pressure 600mmHg at 85 ℃.
Concentration was carried out under the above conditions (pressure reduction of -600 mmHg or more in gauge pressure). After 3 hours and 26 minutes had passed, the concentration was stopped to obtain a concentrate having a solid content concentration of 21.4% by weight. The progress is shown in the table below.

[Comparative Example 1] Only the palm oil drainage discharged from the centrifuge in the palm oil production process was concentrated under the same conditions as in Example 1. The solid content concentration of the palm oil drainage was 2.33% by weight. As a result, the viscosity of the concentrated liquid reached the limit of the reduced pressure concentrator by the reduced pressure concentration for 5 hours and 50 minutes, and further concentration could not be performed. The solid content of the obtained concentrated liquid was 11.07% by weight.
The progress is shown in the table below. The main components of the concentrate obtained are shown in the table below.

[Comparative Example 2] Only the palm oil effluent discharged from the steamer in the palm oil production process was concentrated under the same conditions as in Example 1. The solid content concentration of the palm oil drainage was 4.45% by weight. As a result, the viscosity of the concentrated liquid reached the limit of the reduced pressure concentrator by the reduced pressure concentration for 6 hours and 51 minutes, and further concentration could not be performed. The solid content concentration of the obtained concentrated liquid was 21.95% by weight. The progress is shown in the table below.

[Example 2] Palm oil drainage discharged from the centrifuge in the palm oil production process and natural rubber serum similar to Example 1 were used in a volume ratio of palm oil drainage /
Natural rubber serum = 1/1 was mixed to obtain a mixed solution. The solid content concentration of the mixed solution was 3.52% by weight. This mixed solution was concentrated under the same conditions as in Example 1. After 3 hours and 35 minutes had passed, the concentration was stopped to obtain a concentrated liquid having a solid content concentration of 25.84% by weight. The progress is shown in the table below.

[Example 3] Palm oil effluent discharged from the centrifuge in the process of producing palm oil and the same natural rubber serum as in Example 1 were used in a volume ratio of palm oil effluent / natural rubber serum. = 2/1 and mixed to obtain a mixed solution. The solid content concentration of the mixed solution was 2.92% by weight. This mixed solution
Concentration was performed under the same conditions as in Example 1. The concentration was stopped after 6 hours and 2 minutes, and a concentrated solution having a solid content concentration of 31.72% by weight was obtained. The progress is shown in the table below.

[Example 4] Palm oil drainage discharged from the centrifuge in the palm oil manufacturing process and the same natural rubber serum as in Example 1 were used in a volume ratio of palm oil drainage / natural rubber serum. = 3/2 to obtain a mixed solution. The solid content concentration of the mixed solution was 2.88% by weight. This mixed solution
Concentration was performed under the same conditions as in Example 1. The concentration was stopped after 4 hours and 39 minutes, and a concentrated solution having a solid content concentration of 29.24% by weight was obtained. The progress is shown in the table below.

[Example 5] Palm oil drainage discharged from the centrifuge in the palm oil production process and natural rubber serum similar to that in Example 1 were used in a volume ratio of palm oil drainage / natural rubber serum. = 1/2 to obtain a mixed solution. The solid content concentration of the mixed solution was 3.02% by weight. This mixed solution
Concentration was performed under the same conditions as in Example 1. The concentration was stopped after 5 hours and 26 minutes, and a concentrated solution having a solid content concentration of 35.36% by weight was obtained. The progress is shown in the table below. The main components of the obtained concentrated liquid are as follows.

[Example 6] Palm oil drainage discharged from the centrifuge in the palm oil manufacturing process and the same natural rubber serum as in Example 1 were used in a volume ratio of palm oil drainage / natural rubber serum. = 1/3 and mixed to obtain a mixed solution. The solid content concentration of the mixed solution was 3.02% by weight. This mixed solution
Concentration was performed under the same conditions as in Example 1. The concentration was stopped after 5 hours and 42 minutes to obtain a concentrated solution having a solid content concentration of 40.31% by weight. The progress is shown in the table below. The main components of the obtained concentrated liquid are as follows.

[0056]

As described above in detail, according to the present invention, palm oil effluent can be concentrated to a high solid content concentration (high solid content) at a low cost without decomposing the active ingredient. In addition, since the concentrated liquid is highly storable, it is possible to significantly reduce the space required for processing the palm oil drainage, transportation costs, etc., and use palm oil drainage that has not been effectively used in the past as a fertilizer. It can be suitably used for food, feed and the like.

[Brief description of drawings]

FIG. 1 is a flowchart showing an example of a palm oil production process.

FIG. 2 is a diagram conceptually showing an example of a method for treating waste liquid discharged in the palm oil manufacturing process shown in FIG.

FIG. 3 is a diagram conceptually showing an example of a concentrating device for carrying out the palm oil effluent concentration method of the present invention.

FIG. 4 is a view conceptually showing another example of the concentrating device for carrying out the method for concentrating palm oil waste liquid according to the present invention.

FIG. 5 is a view conceptually showing another example of the concentrating device for carrying out the palm oil waste liquid concentrating method of the present invention.

[Explanation of symbols]

 10 Concentrator 12 Undiluted solution storage tank 14 1st evaporation can 16 2nd evaporation can 18 3rd evaporation can 22 Steam generator 24 Undiluted solution supply tank 26 Steam header 28,32,36,70,78,90,94 Pump 28,32a , 40a Valve 20, 30, 36 Gas-liquid separator 34 Circulation route 38 Solid content concentration meter 50 Steam kettle 52 Centrifuge 54 Hydrocyclone 56 Pit 58 Decanter tank 60 Sludge pit 62 Recovery pit 72 Heat exchanger 74 Separator 76 Hot water tank 80 Mist Separator 82 Aspirator 84 Circulation Pump 86 Tank 92 Condenser 96 Cooler

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshio Tajima Yoshio Tajima 5-36-11 Shimbashi, Minato-ku, Tokyo Yokohama Rubber Co., Ltd. Rubber stock company Hiratsuka Factory (72) Inventor Mahern Gan Malaysia Darengsan Khan 43000 Taman Bukit Chantic Jalan 3 39

Claims (3)

[Claims] 1. A method for concentrating palm oil effluent, which comprises adding natural rubber serum to palm oil effluent, mixing and concentrating. 2. The method for concentrating palm oil effluent according to claim 1, wherein the concentration is carried out by vacuum concentration under a condition of 99 ° C. or less and a negative pressure of 600 mmHg or more. 3. A palm oil drainage concentrate obtained by the method for concentrating palm oil drainage according to claim 1 or 2.