Continuous hydrolysis device and method for preparing erucic acid

Abstract

The continuous hydrolysis device comprises a high-pressure hydrolysis tower, a pure water inlet formed in the top of the high-pressure hydrolysis tower, a grease inlet formed in the side wall of the lower portion of the high-pressure hydrolysis tower, a fatty acid leading-out opening and a dilute glycerin water leading-out opening. An upper-section high-pressure water vapor heating inlet, a middle-section high-pressure water vapor heating inlet and a lower-section high-pressure water vapor heating inlet are sequentially formed between the pure water inlet and the grease inlet from top to bottom; the upper-section high-pressure water vapor heating inlet, the middle-section high-pressure water vapor heating inlet and the lower-section high-pressure water vapor heating inlet are all connected with the high-pressure water vapor heating inlet adjusting valve, and pure water and grease flow in a convection form after entering the high-pressure hydrolysis tower, so that the pure water and the grease are promoted to fully and uniformly contact and transfer mass; the temperature of the middle-section high-pressure steam heating inlet is higher than that of the upper-section high-pressure steam heating inlet and the lower-section high-pressure steam heating inlet, so that full reaction of pure water and grease in each stage is ensured, and the hydrolysis rate of the grease is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of erucic acid production, and in particular to a continuous hydrolysis device and method for preparing erucic acid. Background Art

[0002] Erucic acid is a rare high-grade long-carbon-chain bio-based fatty acid derived from pure natural oil (rapeseed oil). Its thermal stability and light stability are superior to those of traditional liquid unsaturated fatty acids such as oleic acid. It can be used in food surfactants, pharmaceutical raw materials, cosmetic raw materials, polymer material additives, high-grade lubricants and other industries. It is praised by industry experts as a very important green and environmentally friendly basic raw material. In the preparation process of erucic acid, pure water and oil (rapeseed oil) need to be hydrolyzed to obtain mixed fatty acids and glycerol containing erucic acid. The inventor knows a method for preparing erucic acid. In the preparation process of erucic acid, water and oil are directly contacted and mixed for hydrolysis reaction. However, the problem of insufficient contact and uneven mixing of water and oil is prone to occur, and the temperature cannot be effectively regulated according to the reaction conditions of each section in the reaction tower, thereby reducing the heat exchange and mass transfer effect between water and oil, and reducing the hydrolysis conversion rate of oil.

[0003] Therefore, it is necessary to develop and design an apparatus and method for preparing erucic acid, thereby improving the hydrolysis efficiency of oils and fats, which is a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a continuous hydrolysis device and method for preparing erucic acid, which allows pure water and oil to form convection, thereby ensuring that the oil and pure water are fully in contact and evenly mixed, and by adjusting the reaction conditions at different heights in the reaction tower to control the temperature and increase the hydrolysis rate of the oil.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A continuous hydrolysis device for preparing erucic acid comprises a high-pressure hydrolysis tower, a pure water inlet arranged at the top of the high-pressure hydrolysis tower, a fat inlet arranged on the lower side wall of the high-pressure hydrolysis tower, a fatty acid outlet and a dilute glycerol water outlet; an upper high-pressure steam heating inlet, a middle high-pressure steam heating inlet and a lower high-pressure steam heating inlet are arranged in sequence from top to bottom on the side wall of the high-pressure hydrolysis tower between the pure water inlet and the fat inlet; the upper high-pressure steam heating inlet, the middle high-pressure steam heating inlet and the lower high-pressure steam heating inlet are all connected to a high-pressure steam heating inlet regulating valve.

[0007] Preferably, the fatty acid outlet is arranged at the top of the high-pressure hydrolysis tower, and the dilute glycerol water outlet is arranged at the bottom of the high-pressure hydrolysis tower.

[0008] Preferably, a built-in heat exchange distributor is provided in the high-pressure hydrolysis tower above the upper high-pressure steam heating inlet.

[0009] Preferably, the pure water inlet is connected to the pure water preheater through a pure water high-pressure delivery pump, and the grease inlet is connected to the grease preheater through a grease high-pressure delivery pump.

[0010] Preferably, the grease inlet is connected to a porous distribution ring.

[0011] Preferably, the fatty acid outlet is connected to a fatty acid condensation separator for separating fatty acids and water vapor, and the dilute glycerol water outlet is connected to a dilute glycerol water condensation separator for separating dilute glycerol water and water vapor.

[0012] Preferably, the upper high-pressure steam heating inlet, the middle high-pressure steam heating inlet and the lower high-pressure steam heating inlet in the high-pressure hydrolysis tower are all connected with porous distribution plates.

[0013] Preferably, temperature detectors are provided on the inner wall of the high-pressure hydrolysis tower, above the upper high-pressure steam heating inlet, the middle high-pressure steam heating inlet and the lower high-pressure steam heating inlet.

[0014] Preferably, an isotope density meter for detecting the interface between oil and pure water is provided on the inner wall of the lower part of the high-pressure hydrolysis tower.

[0015] Preferably, an in-tower pressure detector is provided at the top of the high-pressure hydrolysis tower.

[0016] The present invention also discloses a continuous hydrolysis device and method for preparing erucic acid, comprising the following steps:

[0017] After the pure water and the oil are heated to a preset temperature, the pure water and the oil enter the high-pressure hydrolysis tower through the pure water inlet and the oil inlet respectively, so that the pure water and the oil flow in a convection manner;

[0018] The upper section high pressure steam heating inlet, the middle section high pressure steam heating inlet and the lower section high pressure steam heating inlet are respectively adjusted by the high pressure steam inlet regulating valve so that the temperature of the middle section high pressure steam heating inlet is greater than the temperature of the upper section high pressure steam heating inlet and the lower section high pressure steam heating inlet;

[0019] The fatty acid containing erucic acid produced after the hydrolysis is discharged from the fatty acid outlet, and the glycerol produced after the hydrolysis is discharged from the dilute glycerol water outlet.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] By arranging the pure water inlet at the top of the high-pressure hydrolysis tower and the oil inlet on the lower side wall of the high-pressure hydrolysis tower, when the pure water and oil enter the high-pressure hydrolysis tower, they form convection flow, which promotes the pure water and oil to fully and evenly contact and transfer the mass, so that the pure water and the oil can fully contact and hydrolyze, thereby improving the hydrolysis conversion rate of the oil, and the high-pressure steam heating inlet regulating valve is used to adjust the temperatures of the upper high-pressure steam heating inlet, the middle high-pressure steam heating inlet, and the lower high-pressure steam heating inlet respectively, so that the temperature of the middle high-pressure steam heating inlet is greater than the temperature of the upper high-pressure steam heating inlet and the lower high-pressure steam heating inlet, thereby ensuring that the pure water and the oil can fully react at each stage, and further improving the hydrolysis reaction rate of the oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Attached Figure 1 This is a schematic diagram of the overall structure of the continuous hydrolysis device for preparing erucic acid disclosed in the present invention;

[0024] Among them, 1. pure water preheater; 2. pure water high-pressure delivery pump; 3. built-in heat exchange distributor; 4. high-pressure hydrolysis tower; 5. oil preheater; 6. oil high-pressure delivery pump; 7. isotope density meter; 8. fatty acid condensation separator; 9. dilute glycerol water condensation separator; N1, upper section high-pressure water vapor heating inlet; N2, middle section high-pressure water vapor heating inlet; N3, lower section high-pressure water vapor heating inlet; N4, dilute glycerol water outlet; N5, fatty acid outlet; P, tower pressure detector; T1, upper temperature detector; T2, middle temperature detector; T3, lower temperature detector; T4, pure water preheater outlet temperature detector; T5, oil preheater outlet temperature detector. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a continuous hydrolysis device and method for preparing erucic acid, so that pure water and oil form convection, thereby ensuring that the oil and pure water are fully in contact and evenly mixed, and by adjusting the reaction conditions at different heights in the reaction tower to control the temperature and increase the hydrolysis rate of the oil.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] refer to Figure 1 The continuous hydrolysis device for preparing erucic acid disclosed in the embodiment of the present invention comprises at least a high-pressure hydrolysis tower 4 for providing a reaction space for pure water and oil, a pure water inlet is arranged at the top of the high-pressure hydrolysis tower 4, an oil inlet is arranged on the side wall of the lower part of the high-pressure hydrolysis tower 4, and a fatty acid outlet N5 and a dilute glycerol water outlet N4 for discharging oil hydrolysis products are also arranged on the high-pressure hydrolysis tower 4, and an upper high-pressure steam heating inlet N1, a middle high-pressure steam heating inlet N2 and a lower high-pressure steam heating inlet N3 are arranged in sequence from top to bottom on the side wall of the high-pressure hydrolysis tower 4, and the upper high-pressure steam heating inlet N1, the middle high-pressure steam heating inlet N2 and the lower high-pressure steam heating inlet N3 are all connected to a high-pressure steam heating inlet regulating valve arranged outside the high-pressure hydrolysis tower 4;

[0029] In this embodiment, by setting the pure water inlet at the top of the high-pressure hydrolysis tower 4 and the oil inlet at the lower side wall of the high-pressure hydrolysis tower 4, when the pure water and oil enter the high-pressure hydrolysis tower 4, they will form a convection flow, which promotes the pure water and oil to fully and evenly contact and transfer the mass, so that the pure water and the oil can fully contact to carry out the hydrolysis reaction, thereby improving the hydrolysis conversion rate of the oil, and the high-pressure steam heating inlet regulating valve is used to adjust the temperature of the upper high-pressure steam heating inlet N1, the middle high-pressure steam heating inlet N2, and the lower high-pressure steam heating inlet N3 respectively, so that the temperature of the middle high-pressure steam heating inlet N2 is greater than the temperature of the upper high-pressure steam heating inlet N1 and the lower high-pressure steam heating inlet N3, thereby ensuring that the pure water and the oil can fully react at each stage, and further The step is to improve the hydrolysis reaction rate of oil (because pure water flows in from the top of the high-pressure hydrolysis tower 4 from top to bottom, and oil floats from the bottom to top from the bottom of the high-pressure hydrolysis tower 4, so during the reaction process, the pure water content in the upper section of the high-pressure hydrolysis tower 4 is higher than the oil content, and the oil content in the lower section is higher than the pure water content, so the reaction concentrations of oil and pure water in the upper and lower sections are relatively small, and the required heat is relatively low, while the oil content and pure water content in the middle section are the highest, and the concentrations of pure water and oil are relatively large, so the required heat is relatively high, so the temperature of the high-pressure steam heating inlet N2 in the middle section is higher than the temperature of the high-pressure steam heating inlet N1 in the upper section and the high-pressure steam heating inlet N3 in the lower section, which can ensure that the oil in each section can fully contact with water for heat exchange and reaction, thereby improving the hydrolysis efficiency of oil).

[0030] It should be noted that the high-pressure hydrolysis tower 4 is a simplified structure of Φ850×38182×29, with a volume capacity of 19.548m 3 , design pressure 6.4MPa, design temperature 280°C, in this embodiment, the high-pressure hydrolysis tower 4 has a height of 36-40 meters, a working pressure of 4.6-5.0MPa, and a working temperature of 220-245°C.

[0031] refer to Figure 1 In one embodiment, the fatty acid outlet N5 is arranged at the top of the high-pressure hydrolysis tower 4, and the dilute glycerol water outlet N4 is arranged at the bottom of the high-pressure hydrolysis tower 4, so that the products after oil hydrolysis, namely fatty acids and glycerol, can be automatically separated.

[0032] refer to Figure 1As a preferred method, a built-in heat exchange distributor 3 is provided above the upper high-pressure steam heating inlet N1 in the high-pressure hydrolysis tower 4. The pure water entering from the pure water inlet passes through the tube side or shell side of the built-in heat exchange distributor 3, and then exchanges heat with the hydrolysis product fatty acid with a higher temperature. The fatty acid passes through the shell side or tube side of the built-in heat exchanger and is discharged from the fatty acid outlet N5. The built-in heat exchanger can not only make the pure water entering the high-pressure hydrolysis tower 4 evenly distributed, but also increase the temperature of the pure water, reduce the temperature of the fatty acids to be discharged, and thus accelerate the rate of the oil hydrolysis reaction;

[0033] It should be noted that the internal heat exchange distributor 3 is a multi-tube cyclone heat exchanger (F = 40m 2 ).

[0034] refer to Figure 1 As an implementation mode, the pure water inlet is connected to the pure water preheater 1 through the pure water high-pressure delivery pump 2, and the grease inlet is connected to the grease preheater 5 through the grease high-pressure delivery pump 6. The pure water preheater 1 and the grease preheater 5 can increase the temperature of the pure water and the grease to reach a preset temperature value, and the pure water high-pressure delivery pump 2 and the grease high-pressure delivery pump 6 can control the flow of pure water and grease to ensure an accurate ratio of pure water and grease;

[0035] It should be noted that the outlets of the pure water preheater 1 and the grease preheater 5 are also provided with a pure water preheater outlet temperature detector T4 and a grease preheater outlet temperature detector T5, respectively, to control the preheating temperature of pure water and grease. The pure water preheater 1 is a spiral plate heat exchanger (F = 10m 2 ), the pure water high pressure delivery pump 2 is a variable frequency injection pump (flow rate 1.6m3 / h, head 800m), the grease preheater 5 is a preferred spiral plate heat exchanger (F = 25m 2 ), the grease high-pressure delivery pump 6 is a variable frequency injection pump (flow rate 2.8m3 / h, head 800m).

[0036] refer to Figure 1 As a preferred method, the oil inlet is connected with a porous distribution ring, which is arranged in the high-pressure hydrolysis tower 4, so that the oil entering from the oil inlet can be evenly distributed, and then fully contact with the pure water for heat exchange, thereby improving the oil hydrolysis efficiency;

[0037] It should be noted that a porous distribution plate may be connected to the oil inlet in the hydrolysis tower, as long as the oil can be evenly distributed.

[0038] refer to Figure 1As a preferred method, the fatty acid outlet N5 is connected to a fatty acid condensation separator 8 for separating fatty acids and water vapor, and the dilute glycerol water outlet N4 is connected to a dilute glycerol water condensation separator 9 for separating dilute glycerol water and water vapor. By using the fatty acid condensation separator 8 and the dilute glycerol water condensation separator 9, fatty acids and dilute glycerol water can be separated from water vapor, thereby improving the purity of glycerol and erucic acid in fatty acids in the subsequent purification process;

[0039] It should be noted that a fatty acid export regulating valve is also provided at the fatty acid export port N5, the fatty acid condensation separator 8 is a simplified Φ600×2200, and a gas-liquid separator is installed on the upper part, and the dilute glycerol water preheating condensation separator is a simplified Φ500×2200, and a gas-liquid separator is installed on the upper part.

[0040] refer to Figure 1 As an implementation method, the upper high-pressure steam heating inlet N1, the middle high-pressure steam heating inlet N2 and the lower high-pressure steam heating inlet N3 in the high-pressure hydrolysis tower 4 are all connected with a porous distribution plate. Through the arrangement of the porous distribution plate, the steam entering from the high-pressure steam heating inlet can be evenly distributed in each section of the high-pressure hydrolysis tower 4, thereby ensuring the uniformity of the temperature of each section of the high-pressure hydrolysis tower 4;

[0041] refer to Figure 1 As an implementation mode, temperature detectors are arranged on the inner wall of the high-pressure hydrolysis tower 4, above the upper high-pressure water vapor heating inlet N1, the middle high-pressure water vapor heating inlet N2 and the lower high-pressure water vapor heating inlet N3, which are respectively an upper temperature detector T1, a middle temperature detector T2 and a lower temperature detector T3, respectively detecting the temperatures of the upper section, the middle section and the lower section of the high-temperature hydrolysis tower, and cooperating with the high-pressure water vapor heating inlet regulating valve to keep the temperature of each section of the high-temperature hydrolysis tower at a preset temperature value.

[0042] refer to Figure 1 As an embodiment, an isotope density meter 7 for detecting the interface between oil and pure water is provided on the inner wall of the lower part of the high-pressure hydrolysis tower 4. After the oil is hydrolyzed, its product fatty acids will float upward, and the product glycerol will dissolve in water to form dilute glycerol water and flow downward. In order to avoid the fatty acids being discharged along with the dilute glycerol water when the dilute glycerol water is discharged, the isotope ratio of the dilute glycerol water and fatty acids is analyzed by the isotope density meter 7. The relative positions of the dilute glycerol water and fatty acids in the mixture can be determined, and then the interface between the dilute glycerol water and fatty acids can be determined. At this time, the dilute glycerol water is discharged by controlling the dilute glycerol water outlet regulating valve connected to the dilute glycerol water outlet N4, and the fatty acids are not discharged.

[0043] It should be noted that the isotope density meter 7 is arranged below the porous distribution ring.

[0044] refer to Figure 1 As an implementation mode, a tower pressure detector P is provided at the top of the high-pressure hydrolysis tower 4 to monitor the pressure value inside the high-pressure hydrolysis tower 4.

[0045] It should be noted that the above-mentioned fatty acids are all fatty acids containing erucic acid.

[0046] The method of using the present invention is as follows: after pure water is preheated to 60-80° C. by a pure water preheater 1, pure water is continuously pumped into the top of a high-pressure hydrolysis tower 4 by a pure water high-pressure delivery pump 2, and the pure water flow rate is controlled by a frequency converter in the pure water high-pressure delivery pump 2 to be 800-1300 kg / h. After the pure water is heated again by an internal heat exchange distributor 3 to increase the temperature, the pure water flows downward evenly and continuously in the tower, and the pure water flow rate is controlled by the pure water high-pressure delivery pump 2;

[0047] After the oil raw material is preheated to 130-150°C by the oil preheater 5, it enters the porous distribution ring in the high-pressure hydrolysis tower 4 from the bottom of the tower by the oil high-pressure delivery pump 6, and the oil flow rate is controlled by the inverter in the oil high-pressure delivery pump 6 to be 900-1360kg / h. The oil evenly distributed through the porous distribution ring floats upward evenly and continuously in the high-pressure hydrolysis tower 4;

[0048] The flow rate (mass) ratio of grease and pure water is controlled at 1:0.8-0.9;

[0049] The fatty acid outlet regulating valve at the top of the high-pressure hydrolysis tower 4 regulates and controls the pressure in the high-pressure hydrolysis tower 4 to 4.6-5.0 MPa, preferably 4.8-4.9 MPa;

[0050] The temperature of the upper section of the high-pressure hydrolysis tower 4 is controlled at 220-235°C by the high-pressure steam heating inlet regulating valve, the temperature of the middle section of the high-pressure hydrolysis tower 4 is controlled at 230-245°C by the high-pressure steam heating inlet regulating valve, and the temperature of the lower section of the high-pressure hydrolysis tower 4 is controlled at 210-230°C by the high-pressure steam heating inlet regulating valve, so that the pure water and the oil are convective and continuously heat exchange and hydrolysis reaction are carried out in the tower, and it is ensured that the pure water and the oil in each section can fully react at different concentrations;

[0051] The fatty acid containing erucic acid produced after hydrolysis continues to float upward, and after heat exchange with pure water through the internal heat exchange distributor 3, it is discharged from the fatty acid outlet N5. The glycerol produced after hydrolysis dissolves in water to form dilute glycerol water, which is discharged from the dilute glycerol water outlet N4.

[0052] According to the above-mentioned continuous hydrolysis device, technical method and specific operation steps, the prepared fatty acid contains more than 41.5% erucic acid, an acid value of 172-182 mgkoh / g, a saponification value of 173-183 mgkoh / g, and a hydrolysis conversion rate of more than 98.5%.

[0053] It should be noted that the pure water mentioned in the present invention is soft water after deoxygenation, the oil is rapeseed oil containing high erucic acid, the high-pressure steam pressure is ≥5.6MPa, the fatty acid is a mixed fatty acid containing erucic acid obtained by hydrolysis of the oil, and the dilute glycerol water is wastewater containing glycerol obtained by hydrolysis of the oil.

[0054] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A continuous hydrolysis device for producing erucic acid, characterized in that: The invention comprises a high-pressure hydrolysis tower, a pure water inlet arranged at the top of the high-pressure hydrolysis tower, a grease inlet arranged on the lower side wall of the high-pressure hydrolysis tower, a fatty acid outlet and a dilute glycerol water outlet; on the side wall of the high-pressure hydrolysis tower, an upper high-pressure steam heating inlet, a middle high-pressure steam heating inlet and a lower high-pressure steam heating inlet are arranged in sequence from top to bottom between the pure water inlet and the grease inlet; the upper high-pressure steam heating inlet, the middle high-pressure steam heating inlet and the lower high-pressure steam heating inlet are all connected to a high-pressure steam heating inlet regulating valve.

2. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: A built-in heat exchange distributor is arranged above the upper high-pressure steam heating inlet in the high-pressure hydrolysis tower.

3. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: The pure water inlet is connected to the pure water preheater through a pure water high-pressure delivery pump, and the grease inlet is connected to the grease preheater through a grease high-pressure delivery pump.

4. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: The grease inlet is connected with a porous distribution ring.

5. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: The fatty acid outlet is connected to a fatty acid condensation separator for separating fatty acids from water vapor, and the dilute glycerin water outlet is connected to a dilute glycerin water condensation separator for separating dilute glycerin water from water vapor.

6. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: The upper high-pressure steam heating inlet, the middle high-pressure steam heating inlet and the lower high-pressure steam heating inlet in the high-pressure hydrolysis tower are all connected with a porous distribution plate.

7. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: Temperature detectors are arranged on the inner wall of the high-pressure hydrolysis tower, above the upper high-pressure steam heating inlet, the middle high-pressure steam heating inlet and the lower high-pressure steam heating inlet.

8. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: An isotope density instrument for detecting the interface between oil and pure water is arranged on the inner wall of the lower part of the high-pressure hydrolysis tower.

9. The continuous hydrolysis device for preparing erucic acid according to claim 1, characterized in that: The top of the high-pressure hydrolysis tower is provided with an internal pressure detector.

10. A continuous hydrolysis device and method for producing erucic acid, characterized in that: The steps include: After the pure water and the oil are heated to a preset temperature, the pure water and the oil enter the high-pressure hydrolysis tower through the pure water inlet and the oil inlet respectively, so that the pure water and the oil flow in a convection manner; The upper section high pressure steam heating inlet, the middle section high pressure steam heating inlet and the lower section high pressure steam heating inlet are respectively adjusted by the high pressure steam inlet regulating valve so that the temperature of the middle section high pressure steam heating inlet is greater than the temperature of the upper section high pressure steam heating inlet and the lower section high pressure steam heating inlet; The fatty acid containing erucic acid produced after the hydrolysis is discharged from the fatty acid outlet, and the glycerol produced after the hydrolysis is discharged from the dilute glycerol water outlet.

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