Methanol removal purification device for fatty acid methyl ester

Abstract

The utility model provides a methanol-removing purification device for fatty acid methyl ester. The methanol-removing purification device comprises an outer kettle body, an inner kettle body; the cover body is arranged between the outer kettle body and the inner kettle body; the anti-overflow net is arranged at the top end of the inner kettle body. According to the utility model, the inner reaction kettle and the outer reaction kettle are arranged, and the cover body is additionally arranged on the inner reaction kettle, so that the methanol steam stroke is increased, and the blowout phenomenon is prevented; the distillation rate is slowed down through heating of the inner kettle and cooling of the outer kettle, the whole distillation process is ensured to be carried out in a stable range, the rectification device is simple and low in cost, the rectification efficiency is also improved, and meanwhile, the safety of the whole device is also ensured.

Description

Technical Field

[0001] The utility model relates to a device for removing methanol from fatty acid methyl ester and purifying it. Background Art

[0002] Lipid exchange has become the main method for producing biodiesel at present because of its simple process, low cost and stable product properties. Low-carbon alcohols such as methanol and ethanol are often used as lipid exchange agents in the ester exchange process. Methanol is easy to obtain and low in cost, so it is more used to synthesize fatty acid methyl esters. According to the principle of lipid exchange reaction, when the molar ratio of methanol to tri-fat oil is 3:1, tri-fat oil can be completely converted into fatty acid methyl ester. However, in the actual reaction, in order to make the reaction proceed in the positive direction of the target, excess methanol is often added to obtain a higher conversion rate so that the reaction can be more complete. Therefore, there is always excess methanol in the system, which needs to be separated, recovered and reused after the reaction is completed. At present, in addition to the industrial methanol distillation tower, there are also vacuum filtration kettles, ordinary rotary evaporators, etc. for the separation of methanol in fatty acid methyl esters, which are respectively used for large-scale, pilot and laboratory use. The present invention is aimed at methanol distillation in the pilot field. When the conventional reactor is vacuumed to separate methanol, when the methanol content in the system is large, such as the excess methanol contained in the esterification reaction, a blowout phenomenon will occur during distillation when the temperature and pressure reach a certain level, and personnel are often required to observe and intervene in pressure relief at any time. Moreover, due to the excessively fast distillation speed, oil or other impurities are easily brought out. Therefore, designing a simple, low-cost device that improves efficiency and safety is the research direction of the utility model. Utility Model Content

[0003] The utility model provides a device for removing methanol from fatty acid methyl ester and purifying it, which can effectively solve the above problems.

[0004] The utility model is achieved in this way:

[0005] A device for removing methanol from fatty acid methyl esters, comprising

[0006] outer kettle body;

[0007] inner kettle body;

[0008] A cover body, arranged between the outer kettle body and the inner kettle body;

[0009] An anti-overflow net is arranged at the top of the inner kettle body;

[0010] A sample inlet extending to the middle and lower part of the inner kettle body;

[0011] The inner kettle body and the cover body form a first flow channel, the outer kettle body and the cover body form a second flow channel, and the first flow channel and the second flow channel are connected to increase the flow stroke of methanol vapor and avoid blowout;

[0012] An interlayer is arranged on the outer wall of the inner kettle body and is used to heat the inner kettle body through a circulating water heating device;

[0013] A vacuum filtration reflux device is connected to the outer kettle body through a filtration port.

[0014] As a further improvement, the cover body is rectangular and inverted U-shaped.

[0015] As a further improvement, the anti-overflow net is made of stainless steel, carbon steel or ceramic.

[0016] As a further improvement, when heated, the temperature of the interlayer ranges from 70° to 100°.

[0017] As a further improvement, a stirrer is disposed inside the inner kettle body, and the stirring speed of the stirrer is 50-200 rpm.

[0018] As a further improvement, the vacuum filtration reflux device is built with a double-layer serpentine reflux condenser.

[0019] As a further improvement, a pressure relief valve is provided at the top of the outer kettle body.

[0020] As a further improvement, the vacuum filtration reflux device is also connected to a collector to collect the crude methanol.

[0021] The beneficial effects of the utility model are:

[0022] (1) The utility model improves the travel distance of methanol vapor, changing the direct tank body rising method to a U-shaped loop design. The change in the travel distance prevents methanol vapor from directly rushing up the reflux pipe, preventing blowout. The existence of the cover body not only increases the travel distance of methanol, but also increases the contact time between methanol vapor and the outer kettle body. Through the inner kettle body heating method, methanol can be quickly distilled at a suitable temperature, and the outer kettle water cooling method allows a large amount of methanol vapor to be cooled down immediately when it passes through, reducing the instantaneous excessive methanol vapor blowout. When the distillation is stable, no water cooling is required. Adding an anti-overflow net on the inner kettle body can greatly reduce the large amount of accumulated microbubbles caused by methanol vapor during distillation and the oil carried by the bubbles. Through the present invention, the increase in the methanol vapor travel distance, the contact area and the cooling effect of the outer kettle can slow down and eliminate the blowout phenomenon caused by the methanol separation of fatty acid methyl esters, and the anti-overflow net can reduce the oil carried by methanol. Through this equipment, not only the safety of methanol distillation is achieved, the stability of the distillation operation is enhanced, but also the impurity content of the distilled methanol is reduced, which is conducive to repeated recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is the front view of the utility model.

[0025] Description of Figure Numbers:

[0026] 1. Outer kettle body; 2. Cover body; 3. Inner kettle body; 4. Pressure relief valve; 5. Inlet; 6. Vacuum filtration reflux device; 7. Collector; 8. Overflow prevention part; 9. Agitator; 10. Interlayer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0028] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] Reference Figure 1 As shown, a demethanolation purification device for fatty acid methyl ester comprises

[0030] The outer kettle body 1; the top of the outer kettle body 1 is provided with a pressure relief valve 4; the sampling port 5 extends to the lower middle part of the inner kettle body 3.

[0031] Furthermore, a water cooling chamber (not shown) is formed on the outer wall of the outer kettle body 1, thereby ensuring that the methanol vapor can be quickly cooled when passing through the flow channel, thereby reducing the instantaneous excessive methanol vapor blowout.

[0032] The sample is introduced into the inner kettle body 3 through the sampling port 5, and then the inner kettle body 3 is heated. When extracting methanol, in order to avoid excessive internal pressure of the inner kettle body 3, the pressure relief valve 4 can ensure a smooth and safe process. At the same time, the water cooling chamber in the outer kettle body 1 can also quickly cool the methanol vapor. The methanol vapor flows through the blocking channel and enters the outer kettle body 1 for cooling, filtration, and enters the true vacuum filtration reflux device 6, and is finally collected in the crude methanol collector 7. The inner kettle body 3 accommodates a mixture of fatty acid methyl esters and methanol, and has an interlayer 10 to heat the mixed raw materials and assist in the separation of methanol.

[0033] Inner kettle body 3; an agitator 9 is arranged inside the inner kettle body 3, and the stirring speed of the agitator 9 is 50-200 rpm. In one embodiment, the stirring speed of the agitator 9 is about 125 rpm. The advantage of such a setting is that it can ensure that the sample inside the inner kettle body 3 can be fully volatilized, thereby improving the distillation effect.

[0034] The cover body 2 is disposed between the outer kettle body 1 and the inner kettle body 3; the cover body 2 is rectangular and inverted U-shaped. In one embodiment, the cover body 2 is inverted U-shaped. The advantage of such a setting is that a large amount of methanol can be prevented from being distilled out at the same time and rising rapidly and rushing to the filtration port, and some of the fatty acid methyl esters carried can be prevented from polluting the vacuum filtration reflux device 6, thereby improving the distillation effect. At the same time, due to the setting of the barrier cover 2, the middle area can be increased, and the impact of methanol vapor will directly rush to the cover 2 and move along the outlet of the cover 2. In this process, the methanol vapor is cooled by the stroke and the outer kettle body 1, so that the overall impact force gradually stabilizes, and when the filtration goes deep, it transitions to a stable filtration state. Furthermore, the cover body 2 can play a blocking and delaying role in the rapid impact process of methanol and grease mixed foam when the vacuum rises rapidly, and increase the stroke of methanol vapor in the methanol hot steam filtration, wherein the inner kettle body 3 and the cover body 2 form a first flow channel 11, and the outer kettle body 1 and the cover body 2 form a second flow channel 12. The first flow channel 11 and the second flow channel 12 are connected to increase the flow stroke of methanol vapor and avoid blowouts.

[0035] Furthermore, the cover body 2 prolongs the contact time between the methanol vapor and the outer kettle body 1, thereby reducing the instantaneous excessive methanol vapor blowout.

[0036] Furthermore, the flow channel formed by the connection of the outer kettle body 1, the cover body 2 and the inner kettle body 3 is a U-shaped loop channel, which increases the stroke of the methanol vapor so that it no longer directly rushes to the reflux pipe, thereby preventing blowout.

[0037] The anti-overflow net 8 is arranged at the top of the inner kettle body 3; the anti-overflow net 8 is made of stainless steel, carbon steel or ceramic. In one embodiment, the anti-overflow net 8 is made of stainless steel to isolate the oil foam caused by methanol vapor.

[0038] The interlayer 10 is arranged on the outer wall of the inner kettle body 3, and the inner kettle body 3 is heated by a circulating water heating device. Furthermore, the interlayer 10 and the inner kettle body 3 form a cavity, and one end of the cavity extends out of the outer kettle body 1, so that the aqueous solution is added into the cavity, and the inner kettle body 3 is heated in a water bath by the heating device. During heating, the temperature in the interlayer 10 is 70-100°. In one embodiment, the temperature of the aqueous solution is about 85 degrees. The advantage of this arrangement is that it can avoid the rapid rise of methanol and improve the safety of the device.

[0039] The vacuum filtration reflux device 6 is connected to the outer kettle body 1 through the filtration port, and the vacuum filtration reflux device 6 has a built-in double-layer serpentine reflux condenser, which is composed of two layers of inner and outer glass tubes. The inner tube is a spiral water-cooled tube, which increases the cooling area and thus improves the cooling efficiency. Due to the serpentine design, the condenser can provide a longer cooling path within a unit length, so that the steam has more time and opportunities to condense.

[0040] Furthermore, the double-layer serpentine reflux condenser is made of glass.

[0041] The vacuum filtration reflux device 6 is connected to the collector 7 to collect the crude methanol.

[0042] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A demethanolation purification device for fatty acid methyl ester, characterized in that: include Outer kettle body (1); Inner kettle body (3); A cover body (2) is arranged between the outer kettle body (1) and the inner kettle body (3); An anti-overflow net (8) is arranged at the top of the inner kettle body (3); A sample inlet (5) extending to the middle and lower part of the inner kettle body (3); The inner kettle body (3) and the cover body (2) form a first flow channel (11), the outer kettle body (1) and the cover body (2) form a second flow channel (12), and the first flow channel (11) and the second flow channel (12) are connected to increase the flow path of methanol vapor and avoid blowout; An interlayer (10) is arranged on the outer wall of the inner kettle body (3) and heats the inner kettle body (3) through a circulating water heating device; A vacuum filtration reflux device (6) is connected to the outer kettle body (1) through a filtration port.

2. A demethanolation purification device for fatty acid methyl ester according to claim 1, characterized in that: The cover body (2) is rectangular and inverted U-shaped.

3. A demethanolation purification device for fatty acid methyl ester according to claim 1, characterized in that: The anti-overflow net (8) is made of stainless steel, carbon steel or ceramic.

4. The demethanolation purification device for fatty acid methyl ester according to claim 1, characterized in that: When heated, the temperature of the interlayer (10) is in the range of 70-100°.

5. The demethanolation purification device for fatty acid methyl ester according to claim 1, characterized in that: A stirrer (9) is arranged inside the inner kettle body (3), and the stirring speed of the stirrer (9) is 50-200 rpm.

6. The demethanolation purification device for fatty acid methyl ester according to claim 1, characterized in that: The vacuum filtration reflux device (6) has a built-in double-layer serpentine reflux condenser.

7. The demethanolation purification device for fatty acid methyl ester according to claim 1, characterized in that: A pressure relief valve (4) is provided at the top end of the outer kettle body (1).

8. The device for removing methanol from fatty acid methyl ester according to claim 1, characterized in that: The vacuum filtration reflux device (6) is connected to the collector (7) to collect the crude methanol.

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