KR20090115248A - Methanol distiller vacuum agitator combined for marking bio-diesel - Google Patents

Abstract

PURPOSE: A methanol distiller and vacuum stirrer in one are provided to improve productivity and reduce a process while increasing yield of methanol by using inexpensive cooking oil as a material for producing biodiesel. CONSTITUTION: A methanol distiller and vacuum stirrer in one includes the followings: a tank(25) storing cooking oil which is a raw material of biodiesel, methanol, and methoxide in which the methanol and caustic soda are mixed; a rotary shaft(49) installed at the tank; a rotational vane(34) agitating liquid in the tank by the rotation of the rotary shaft; a motor(33) prepared to rotate the rotary shaft; and a vacuum pump(26) operated to vacuumize the tank.

Description

Methanol distiller vacuum agitator combined for marking bio-diesel for the production of biodiesel based on cooking oil

The present invention relates to an apparatus for producing biodiesel, which is a vegetable alternative energy, and more particularly, to a vacuum stirrer for a methanol distillation.

In recent years, the importance of developing alternative energy to replace petroleum resources is increasing due to high oil prices and fossil energy depletion and severe global warming and environmental pollution.

Energy that can replace oil or coal includes wind and tidal energy or solar power, hydroelectric power and nuclear energy.However, in the case of hydroelectric power, large-scale sinking due to dam construction, migration of residents, and other environmental problems In the case of nuclear power, the operation cost is the lowest and large-scale power generation is possible, but it is difficult to obtain the consent of the residents in terms of disposal and storage of radioactive waste and safety, and thus it is being braked to expand the supply. The energy obtained by using it is a pollution-free natural energy, but there is a problem that the amount of energy obtained therefrom is small and the energy supply and demand is unstable due to the change of natural phenomena.

On the other hand, a large portion of petroleum resources are used in the transportation field, and as a power source of automobile engines, in terms of economical efficiency and high power, it is possible to use other energy sources and new energy sources that can completely replace oil. The universal supply of oil is still a long way off, and whether reserves can defer finite petroleum resources as much as possible while securing new energy sources is closely related to the future of humanity.

For this reason, interest in the so-called biodiesel, which can replace the diesel oil used in diesel engines using vegetable oil, has recently increased, and it is believed that economic efficiency has been secured to some extent under the current high oil prices.

Biodiesel is made from vegetable oil as the main raw material (which may contain some animal fats and oils), and contains a large amount of glycerin and soap components, which are inadequate impurities, as fuel components, making it difficult to use as fuel for an engine under unpurified conditions. As it is difficult, it is an alternative energy source that removes impurities through esterification reaction and obtains so-called pure biodiesel and replaces diesel oil so that it can be used as fuel of diesel engine. Soybean, brown rice, corn, sunflower as main oils It is edible oil extracted from 100% plants such as rapeseed, rice bran and palm oil, and these plants are grown repeatedly, so there is no danger of depletion, unlike petroleum resources, which are mined from underground. It can also be used to regenerate fats. Biodiesel and biodiesel have similar physical properties, which can be mixed with diesel and used as a fuel for diesel engines, thereby delaying the depletion of petroleum resources.

In the case of diesel fuel alternatives such as LPG or LNG, it is quite expensive to convert diesel engines to the auto-cycle spark ignition method.However, biodiesel has very similar properties to diesel and has a high octane number, so the compression and ignition of diesel engines It can be used without any modification of the existing engine because it can be burned by. It has no advantages, it is harmless to the human body, has a high ignition point than diesel and has high safety and easy handling in storage and transportation.

This biodiesel is mixed with vegetable oil (edible oil), about 12% methanol (or medoside mixed with methanol and caustic soda), stirred evenly, and then separated through a purification process to increase purity and biodiesel and soap. Glycerin containing ingredients are obtained, and finally, pure biodiesel is obtained by separating and removing glycerine, soap ingredients, and impurities such as water.

4 shows a conventional production method for obtaining the biodiesel.

Methanol and caustic soda are stirred through the stirrer (11) to make medosides (methoxide), and then put into the stirrer (12), and then added to the cooking oil and stirred, the reaction oil and medoside reacted with biodiesel, glycerin and soap Solid components are formed.

When these products are supplied to the centrifuge and centrifuged, the biodiesel, glycerin, and soap components are separated by the difference in specific gravity, and the separated glycerin and soap components are discharged, and the biodiesel is introduced into the stirrer 14. In addition, when the water of about twice the amount of biodiesel is added to the stirrer 14 and stirred (washing step), the glycerin, soap component and methanol component contained in the biodiesel are dissolved in water. Is added to the centrifuge 15 and separated again, and various ingredients such as glycerin dissolved in water are separated, and the wastewater solution containing these ingredients is discharged to the discharge line. Thus, by adding water, various ingredients such as glycerin are added to the water. After repeating the washing process of dissolving and discharging, two to three times, the distillation unit 16, which is a heater unit, is finally operated to remain in the biodiesel. 1 to have gained a finished biodiesel By conducting the distillation process to send blow evaporated to approximately 2% water.

However, the conventional manufacturing method described above requires a washing process with water, so that the glycerine, methanol, and soap components are dissolved in water, and are discharged into a wastewater having a high COD value. There is a huge additional cost of treatment, sufficient industrial water, and a lot of energy is used to distill the water.

In view of this, the present inventors, through Korean Patent Registration No. 762107, have no wastewater generation in the process of releasing residual methanol from glycerin and soap components, which are impurities generated by methanol input to convert cooking oil into biodiesel. A method of producing biodiesel with a simple process has been proposed.

The foregoing patent by the present inventors (see FIG. 5) is a process of forming medoside by stirring methanol and caustic soda;

Adding the medoside and cooking oil to a stirrer and stirring the mixture;

Impurity separation and discharging step of inputting the stirred liquid into a centrifuge to separate biodiesel and impurities to separate and discharge impurities such as glycerin and soap components;

In order to separate glycerin and soap components, which are impurities remaining in the remaining biodiesel through the distillation process, 0.5 to 5% of magnesium silicate is added in a weight ratio to biodiesel, and magnesium silicate is combined with molecules of glycerin and soap components. An impurity precipitation step of forming and depositing a solid mass;

And a filtering step of filtering the biodiesel through the impurity precipitation process and filtering the impurities, which are solid lumps during transport, and passing only the liquid biodiesel to obtain a biodiesel finished product.

The above-mentioned patent uses magnesium silicate instead of water to precipitate impurities into solid mass when washing, which solves a large amount of wastewater discharge problem and lack of industrial water, which is environmentally friendly and consumes less energy. However, the agitation efficiency is low, and after the stirring, the biodiesel produced in the first stage of the centrifugal separator is continuously reacted with methanol, resulting in a lot of glycerin. From the beginning, there was a problem in that the production cost of the product was increased by using crude oil (edible oil) of high quality feedstock.

In other words, the crude cooking oil is ① crude oil squeezed directly from grains, rapeseed flowers, and palms. ② degumming oil that has removed various residues from rapeseed oil. ④ refined oil and ④ there are four stages of highly refined edible oil to the stage of eating so that the food company can supply to consumers. In the case of the above invention, the use of low quality ①② stage crude cooking oil is impossible, high quality ③④ There was a problem that the cost is expensive because the quality of the biodiesel is obtained only by using the cooking oil of the stage.

On the other hand, in the prior invention, since the methanol distillation and recovery unit must be provided separately from the stirrer, the structure of the device is complicated, the equipment cost is increased, occupies a lot of place, and the crude oil put into the stirrer is raised to a certain temperature and then stirred. As a result, there is a problem that the working waiting time is long and the purification capacity per unit time is relatively low.

On the other hand, in order to obtain high quality biodiesel, the stirring efficiency should be excellent and the methanol recovery performance should be excellent.

In view of this point, the present inventor has proposed a stirring device consisting of a square tank in Korean Patent Registration No. 762106, which is to form a vortex of the liquid stirred near the corner of the quadrilateral tank to increase the stirring efficiency. Despite the increase in the stirring efficiency to some extent, there was room for improvement in that it was not possible to expect an improvement in the stirring efficiency enough to use a lower grade cooking oil as a raw material.

Therefore, the present invention has been proposed in view of the above problems of the prior art, and its purpose is to obtain high quality biodiesel using low cost cooking oil having excellent stirring efficiency and low cost, and the equipment is compact. The present invention provides a vacuum stirring device for producing biodiesel, in which a process is shortened and productivity is always increased, methanol recovery is increased, and a stirrer can also serve as a methanol distillator.

In order to achieve the above object, the present invention includes a tank for receiving and storing edible oil which is a raw material of biodiesel, and a medoside, which is a mixture of methanol and caustic soda;

A rotating shaft rotatably installed in the tank;

Rotating stirring vanes mounted to the rotating shaft to stir the solution in the tank by the rotation of the rotating shaft;

A motor provided to rotate the rotating shaft;

And a vacuum pump connected to the tank through a pipeline to operate to vacuum the inside of the tank when the cooking oil and the medoside are stirred.

And according to another feature of the present invention is provided with a pump for circulating the liquid supplied in the tank, the injector is provided with a plurality of injection nozzle holes to inject the liquid forced by the pump back from the tank top to the bottom Characterized in that it includes.

In another aspect of the present invention, a heat exchange pipe for heating the supplied liquid is disposed in the tank, and the heat exchange pipe is connected to a boiler for supplying steam or hot water. do.

According to another feature of the present invention, a methanol recovery storage tank for recovering and storing methanol is connected to the tank, and when the methanol is recovered, the temperature in the tank is heated above the boiling point of methanol and the rotating stirring blade is rotated at a low speed. It is characterized by being made.

In addition, according to the present invention is characterized in that the cooking oil supplied to the tank is pre-heated and supplied in advance.

In addition, according to the present invention, after the stirring operation is completed, the lower part of the tank is characterized in that the discharge pipe for discharging the glycerin and soap components first, and for transferring the first-generated biodiesel to the centrifuge side.

In addition, according to the present invention is characterized in that the pipeline for supplying the edible oil and medoside is connected to the injector is injected into the tank through the injector.

According to the present invention as described above by circulating the stirring liquid in a vacuum atmosphere and spraying the shower while proceeding the stirring operation, the stirring efficiency is maximized, low-grade cooking oil can be used as crude oil, and a separate methanol distiller is omitted and the stirrer As it is combined, the facility is simple, and since the crude oil to be added to the stirrer is preheated and added, the stirring time can be shortened, so that the productivity per unit time is high.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a manufacturing process of a biodiesel based on the cooking oil of the present invention, Fig. 2 is a schematic overall configuration diagram of a device for producing a biodiesel according to the present invention, and Fig. 3 is a vacuum according to the present invention. It is a figure which shows a stirring apparatus.

In order to produce biodiesel, methanol and caustic soda are added to the medoside stirrer 21 and stirred to form medoside, and the medoside is supplied to the vacuum stirrer 22. The vacuum stirrer 22 is a vacuum stirring process in which cooking oil which is a raw material of biodiesel, for example, soybean, brown rice, corn, sunflower, rapeseed, rice bran, coconut oil, and the like, is introduced and stirred with medosides evenly. Conduct.

The cooking oil is preheated to 40 ~ 50 ℃ through the preheater (23) before input to the vacuum stirring device 22, and then put into the earthquake stirring system 22 through the crude oil storage tank 24, vacuum stirring device A plurality of (22) are arranged so that edible oil (crude oil) and medoside are sequentially supplied and stirred.

The vacuum stirring process is stirred in a vacuum atmosphere of 100 ~ 900mmHg, preferably 600 ~ 700mmHg, the cooking oil supplied in a preheated state at 40 ~ 50 ℃ is heated again to 55 ~ 65 ℃ in the tank 24 Stir.

The vacuum stirrer 22 is connected to a vacuum pump 26 for evacuating the inside of the tank 25 through a conduit 27 and to heat crude oil (edible oil) supplied into the tank 25. The heat exchange pipe 28 is disposed, the heat exchange pipe 28 is supplied with steam or hot water from a boiler (not shown) to heat the crude oil to 55 ~ 60 ℃ by heat exchange, the cooking oil and medoside pipe (29) It is supplied into the tank 25 through the (30).

The raw material in the tank 25 is self-circulated through the pump 31, and is sprayed in a shower type through the injector 32 disposed in the upper part of the tank 25 (having a plurality of injection nozzle holes). The stirring blades 34 are rotated by the rotation of the rotary shaft 49 by driving the 33 to stir the raw materials.

In addition, by connecting the pipes 29 and 30 for supplying the edible oil and medoside to the injector 32, the raw materials supplied in the tank 25 can be sprayed to improve the stirring efficiency.

The stirring temperature is kept lower than the evaporation temperature of methanol, and the inside of the vacuum atmosphere, that is, the core of the present invention, that is, the vacuum pump 26 is operated to make the vacuum in the tank 25 and then perform stirring for about 1 to 3 hours. Having a break time of about 20 to 60 minutes, glycerin is sufficiently precipitated and has a glycerin precipitation process to sink in the tank 25.

In this case, when the inside of the tank 25 is evacuated, the materials are swollen like bread, and the molecular bond structure is loosened, so that the penetration of other molecules is facilitated, and the stirring efficiency of the different materials becomes very good.

After the stirring process is completed, the heat exchange temperature by the heat exchange pipe 28 is increased to heat the temperature of the solution in the tank 25 to 70 ° C. or more, which is the evaporation temperature of methanol, and the stirring blade 34 is slowly rotated to drive the methanol. The evaporated methanol is recovered in line 35 to the methanol recoverer 36 through the evaporation (accumulation and better evaporation takes place), and on the way, the liquid is recovered and stored by liquefying methanol into the liquid phase via the cooler 37. When the recovery process of methanol is completed, impurities such as glycerin at the bottom of the tank 25 precipitated in the tank 25 are first discharged through the discharge pipe 44 connected to the lower part of the tank to store the glycerin storage tank. (38), the biodiesel produced in the first step after separating and discharging impurities such as glycerin and soap components in turn is passed through the intermediate storage tank 39 through the discharge pipe 44. By centrifugation and put into a separator 40, and thereby centrifugal separation of biodiesel glycerol in the purified first, impurities centrifuged glycerin and the like, and stores the discharged to the storage tank 38.

By separating the glycerin, the secondary purified biodiesel is sent to the magnesium silicate reactor 42 via the intermediate storage tank 41 to perform the impurity precipitation process.

In the magnesium silicate reaction process, 0.5-5% of magnesium silicate is mixed and stirred in a weight ratio with respect to biodiesel.

When magnesium silicate is stirred with biodiesel, it reacts with the glycerin and soap components remaining in the biodiesel to bind their molecules to form and precipitate a solid mass.

The biodiesel containing the precipitated impurity solid mass passes through the filter device 43 and performs a filtering process in which impurities precipitated into the solid mass are filtered out and discharged only through the pure liquid biodiesel.

In this way, when passing through the filter device 43, a biodiesel having a high purity is finally obtained. The biodiesel is supplied to a gas station and used in a diesel engine by mixing a predetermined ratio with existing diesel oil.

Although the description is omitted here, the T-shaped 45 shown in each line in the drawings are solenoid valves selectively controlled to open and close according to the device situation, and the reference numeral 46 is pumps operated to transfer liquid through each line. , 48 is a support leg of the device.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the manufacturing process of the biodiesel using the cooking oil of this invention as a raw material.

Figure 2 is a schematic overall configuration of the apparatus for producing biodiesel according to the present invention

3 is a view showing a vacuum stirring apparatus according to the present invention

4 is a prior art

5 is a view showing the prior patent technology by the present inventors

※ Explanation of code about main code of drawing

21: medoside agitator 22: agitator

23: preheater 24: crude oil storage tank

25 tank 26 vacuum pump

27: pipeline 28: heat exchange piping

29,30: pipeline 31: pump

32: injector 33: motor

34: stirring blade 35: line

36: methanol recovery 37: cooler

38 tank 39 intermediate storage tank

40: centrifuge 41: intermediate storage tank

42: magnesium silicate reactor (impurity precipitate) 43: filter device

44: discharge line 45: solenoid valve

46: pump 49: rotating shaft

Claims (7)

 A tank for receiving and storing edible oil, which is a raw material of biodiesel, and medoside, which is a mixture of methanol and caustic soda; A rotating shaft rotatably installed in the tank; Rotating stirring blades mounted on the rotating shaft to stir the solution in the tank by the rotation of the rotating shaft; A motor provided to rotate the rotating shaft; A methanol pump connected to the tank through a pipe line, the vacuum pump being operated to vacuum the inside of the tank when the cooking oil and the medoside are stirred; a methanol distillator for manufacturing biodiesel using the cooking oil as a raw material Combined vacuum stirring device. The method of claim 1, A pump is provided to circulate the liquid supplied into the tank, and includes an injector provided with a plurality of injection nozzle holes to inject the liquid circulated by the pump from the tank top to the bottom again. Methanol distillation combined use vacuum stirring device for production of biodiesel based on cooking oil. The method of claim 1, The tank is provided with heat exchange pipes for heating the supplied liquid, and the heat exchange pipes are connected to a boiler for supplying steam or hot water. Methanol distillation combined vacuum stirring device for. The method of claim 3, wherein A methanol recovery storage tank for recovering and storing methanol is connected to the tank, and when recovering the methanol, the temperature in the tank is heated above the boiling point of methanol, and the rotary stirring blade is rotated at a low speed to distill methanol. A methanol distillation combined use vacuum stirring device for production of biodiesel based on edible oil. The method of claim 1, The cooking oil supplied to the tank is a methanol distiller combined vacuum stirring device for the production of biodiesel using the cooking oil as a raw material, characterized in that the pre-heating is supplied in advance. The method of claim 1, After the stirring operation is completed, the lower part of the tank is discharged first of the glycerin and soap components, the discharge pipe for connecting the first generated biodiesel to the centrifuge side is connected to the production of biodiesel from the cooking oil as raw materials Vacuum stirring device for methanol distillation. The method of claim 2, And a pipeline for supplying the edible oil and the medoside is connected to the injector and injected into the tank through the injector to supply the edible oil to the methanol distillation unit for the production of biodiesel based on the edible oil.

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