Chiral hydrolysis device for epoxide

Abstract

The chiral hydrolysis device is characterized in that the other end of a first pipeline is connected with a second valve, the second valve is connected with a feeding opening in a hydrolysis kettle, the output end of a water tank is connected with one end of a third valve, and the other end of the third valve is connected with the feeding opening in the hydrolysis kettle; the input end of the hydrolysis condenser is connected with the hydrolysis kettle through a pipeline, the output end of the hydrolysis condenser is connected with one end of a second pipeline, the other end of the second pipeline is connected with one end of a fourth valve, the other end of the fourth valve is connected with a buffer tank, and one end of a fifth valve is connected with the second pipeline; the other end of the fifth valve is connected with one end of a third pipeline, the hydrolysis kettle is in a distillation stage, the other end of the third pipeline is connected with the other end of the first valve, and the other end of the first valve is connected with an epoxide receiving tank. According to the utility model, the hydrolysis safety can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical engineering, in particular to a chiral hydrolysis device for epoxy compounds. Background Art

[0002] Propylene oxide, also known as propylene oxide, methyl ethylene oxide, and 1,2-propylene oxide, is an organic compound with the chemical formula C3H6O. It is a very important raw material for organic compounds and the third largest propylene derivative after polypropylene and acrylonitrile.

[0003] The hydrolysis reaction of propylene oxide is usually carried out in a hydrolysis kettle, with the aid of a stirring device to stir the materials so that the materials are mixed evenly and the hydrolysis reaction can proceed fully.

[0004] The existing production process of epichlorohydrin disclosed in CN201516343U is as follows: a circulation pump is started, and the material in the hydrolysis kettle is pumped out from the bottom of the hydrolysis kettle by the circulation pump, and then the material is pumped into the hydrolysis kettle from the top of the hydrolysis kettle, so that the material in the hydrolysis kettle circulates, and under the action of the stirring device in the hydrolysis kettle and the forced material circulation of the circulation pump, the material in the hydrolysis kettle is made uniform, the hydrolysis reaction is accelerated, the reaction time is shortened, and the production capacity of a single device is improved.

[0005] Although the above scheme improves the uniformity of the hydrolysis material, the use of a circulating pump to circulate the material will cause the epoxy to gasify, which may cause an explosion. Therefore, the above scheme has the defect of a low safety factor during the hydrolysis process. Utility Model Content

[0006] The utility model provides a chiral hydrolysis device for epoxy compounds, and the utility model can improve the safety of hydrolysis.

[0007] The technical solutions to the above technical problems are as follows:

[0008] The chiral hydrolysis device of epoxy material comprises a hydrolysis kettle, a feeding tank, a first valve, a first pipeline, a second valve, a water tank, and a third valve. The feeding tank is connected to one end of the first valve in the feeding stage, the other end of the first valve is connected to one end of the first pipeline in the feeding stage, the other end of the first pipeline is connected to the second valve, the second valve is connected to the feeding port on the hydrolysis kettle, the output end of the water tank is connected to one end of the third valve, and the other end of the third valve is connected to the feeding port on the hydrolysis kettle. The device also comprises a pipeline, a hydrolysis condenser, a second pipeline, a fourth valve, a buffer tank, a fifth valve, a third pipeline, an epoxy material receiving tank, a steam supply unit, an input pipeline, an output pipeline, a steam input valve, and a steam output valve.

[0009] The input end of the hydrolysis condenser is connected to the hydrolysis kettle through a pipeline, the output end of the hydrolysis condenser is connected to one end of the second pipeline, the other end of the second pipeline is connected to one end of the fourth valve, the other end of the fourth valve is connected to the buffer tank, one end of the fifth valve is connected to the second pipeline, the other end of the fifth valve is connected to one end of the third pipeline, the other end of the third pipeline of the hydrolysis kettle is connected to the other end of the first valve in the distillation stage, and the other end of the first valve is connected to the epoxy receiving tank;

[0010] The hydrolysis kettle is provided with a jacket, the steam supply unit is connected to one end of the steam input valve, the other end of the steam input valve is connected to the input pipeline, the input pipeline is connected to the input port provided on the jacket; the output port provided on the jacket is connected to the output pipeline, and the steam output valve is connected to the output pipeline.

[0011] In the utility model, the hydrolysis kettle is connected in series with the pipeline, the hydrolysis condenser, the second pipeline, the fourth valve, and the buffer tank. During the hydrolysis process, the gas generated in the hydrolysis kettle enters the hydrolysis condenser through the pipeline to be condensed to form a liquid, and the liquid enters the buffer tank through the second pipeline connected to the hydrolysis condenser and the fourth valve. Thus, the gas generated during the hydrolysis process is converted into a liquid, thereby avoiding the presence of dangerous gas in the device, and further avoiding the occurrence of explosions. Therefore, the utility model improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The schematic diagram of the chiral hydrolysis device of the epoxy compound of the utility model is shown in FIG.

[0013] Figure 2 for Figure 1 Enlarged view of part A in .

[0014] Figure 3 for Figure 1 Enlarged view of part B in .

[0015] Figure 4 for Figure 1 Enlarged view of section C in .

[0016] Figure 5 for Figure 1 Enlarged view of part D in .

[0017] Symbols in the accompanying drawings: hydrolysis kettle 1, pipeline 1a, jacket 1b, nitrogen filling port 1c, auxiliary feeding port 1d, safety valve 1e, feeding tank 2, first hose 2a, check valve 2b, nitrogen storage tank 2c, first valve 3, first pipeline 4, second valve 5, water tank 6, third valve 7, hydrolysis condenser 8, second pipeline 9, fourth valve 10, buffer tank 11, material barrel 11a, tail gas absorption unit 12, fifth valve 13, third pipeline 14, epoxy Receiving tank 15, steam supply unit 16, input pipeline 17, output pipeline 18, steam input valve 19, steam output valve 20, chilled brine water supply unit 21, chilled brine return unit 22, water inlet valve 23, return valve 23a, cooling water water supply unit 24, cooling water return unit 25, emergency pipeline venting flame arrester 26, sixth valve 27, vacuum system 28, seventh valve 29, first pipeline flame arrester 30, first tail gas absorption unit 31. DETAILED DESCRIPTION

[0018] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] First of all, it should be explained that the described embodiments are merely embodiments derived from the explanation of the drawings, and are not all embodiments of the present utility model. As for the directional words used, such as "upper end" and "lower end", they are merely further explanations of the drawings, rather than limitations on the present utility model.

[0020] like Figures 1 to 5 The chiral hydrolysis device of epoxy material of the utility model comprises a hydrolysis kettle 1, a feeding tank 2, a first valve 3, a first pipeline 4, a second valve 5, a water tank 6, a third valve 7, a pipeline 1a, a hydrolysis condenser 8, a second pipeline 9, a fourth valve 10, a buffer tank 11, a fifth valve 13, a third pipeline 14, an epoxy material receiving tank 15, a steam supply unit 16, an input pipeline 17, an output pipeline 18, a steam input valve 19, and a steam output valve 20. The following describes the various parts and the relationship between them:

[0021] The hydrolysis kettle 1 and the feeding tank 2 are both provided with a temperature sensor, a liquid level sensor and a pressure sensor. The hydrolysis kettle 1 is provided with a nitrogen filling port 1c, an auxiliary feeding port 1d and a safety valve 1e. The feeding tank 2 is connected to one end of a first hose 2a, the other end of the first hose 2a is connected to one end of a check valve 2b, the other end of the check valve 2b is connected to a nitrogen storage tank 2c, the feeding tank 2 is connected to one end of a first valve 3 during the feeding stage, the other end of the first valve 3 is connected to one end of a first pipeline 4 during the feeding stage, the first valve 3 preferably adopts an automatic shut-off valve, after the feeding is completed, the connection between the first valve 3 and the feeding tank 2 and the first pipeline 4 can be disconnected.

[0022] The other end of the first pipeline 4 is connected to the second valve 5, and the second valve 5 is connected to the feeding port on the hydrolysis kettle 1. The output end of the water tank 6 is connected to one end of the third valve 7, and the other end of the third valve 7 is connected to the feeding port on the hydrolysis kettle 1. The hydrolysis kettle 1 is equipped with an agitator, which is composed of a stirring motor M, a rotating shaft and a stirring paddle. The connection relationship of the agitator and the matching relationship with the hydrolysis kettle 1 are prior art and are not described here. The second valve 5 and the third valve 7 can be manual valves or electric valves. In the feeding stage, the second valve 5 and the third valve 7 are in an open state. After the feeding is completed, the second valve 5 and the third valve 7 are in a closed state.

[0023] The input end of the hydrolysis condenser 8 is connected to the hydrolysis kettle 1 through a pipe 1a. A cooling jacket is provided on the outer wall of the hydrolysis condenser 8 or a cooling coil is wound around it. In this embodiment, the cooling coil is preferably wound around the outer wall of the hydrolysis condenser 8, and the refrigerant is input into the cooling coil to cool the hydrolysis condenser 8. The refrigerant is usually liquid, such as Freon.

[0024] The output end of the hydrolysis condenser 8 is connected to one end of the second pipeline 9, the other end of the second pipeline 9 is connected to one end of the fourth valve 10, the other end of the fourth valve 10 is connected to the buffer tank 11, the fourth valve 10 can be a manual valve or an electric valve, and the buffer tank 11 is provided with a pressure sensor and a liquid level sensor, and the pressure and hydraulic pressure in the buffer tank 11 are controlled by the pressure sensor and the liquid level sensor respectively. The material in the buffer tank 11 is lowered into the material barrel 11a through the pipeline.

[0025] One end of the fifth valve 13 is connected to the second pipeline 9. In the hydrolysis stage, the fourth valve 10 is in an open state and the fifth valve 13 is in a closed state. In the distillation stage, the fourth valve 10 is in a closed state and the fifth valve 13 is in an open state. The other end of the fifth valve 13 is connected to one end of the third pipeline 14. The other end of the third pipeline 14 of the hydrolysis kettle 1 is connected to the other end of the first valve 3 in the distillation stage, and the other end of the first valve 3 is connected to the epoxy receiving tank 15. In the feeding stage, the feeding tank 2 and the first pipeline 4 are connected to the first valve 3, and the third pipeline 14 and the epoxy receiving tank 15 are disconnected from the first valve 3. In the distillation stage, the feeding tank 2 and the first pipeline 4 are disconnected from the first valve 3, and the third pipeline 14 and the epoxy receiving tank 15 are connected to the first valve 3.

[0026] The hydrolysis kettle 1 is provided with a jacket 1b, the steam supply unit 16 is connected to one end of a steam input valve 19, the other end of the steam input valve 19 is connected to an input pipeline 17, the input pipeline 17 is connected to an input port provided on the jacket 1b, the output port provided on the jacket 1b is connected to an output pipeline 18, and a steam output valve 20 is connected to the output pipeline 18.

[0027] This embodiment further includes a chilled brine water supply unit 21, a chilled brine water return unit 22, a water inlet valve 23, and a water return valve 23a. The chilled brine water supply unit 21 is connected to one end of the water inlet valve 23, the other end of the water inlet valve 23 is connected to the input pipe 17, one end of the water return valve 23 is connected to the output pipe 18, and the other end of the water return valve 23a is connected to the chilled brine water return unit 22. In the hydrolysis stage, for safety reasons, it is necessary to cool the solution in the hydrolysis kettle 1. Through the above structure, the chilled brine can be input into the space formed between the jacket 1b and the hydrolysis kettle, thereby cooling the solution in the hydrolysis kettle 1.

[0028] Since there are many types of epoxy products to be hydrolyzed, and different types of epoxy products require different cooling temperatures during hydrolysis, different coolants can be used for cooling, that is, in addition to the above-mentioned frozen brine, salt-free cooling water can also be used to cool the solution in the hydrolysis kettle 1. Therefore, the utility model also includes a cooling water supply unit 24, a cooling water return unit 25, an inlet valve 23, and a return valve 23a. The cooling water supply unit 24 is connected to one end of the inlet valve 23, and the other end of the inlet valve 23 is connected to the input pipe 17. One end of the return valve 23a is connected to the output pipe 18, and the other end of the return valve 23a is connected to the cooling water return unit 25.

[0029] It can be seen from the above that in the present invention, the two types of cooling methods share the water inlet valve 23 and the water return valve 23a. According to the specific epoxy material to be hydrolyzed, the required coolant is selected to cool the hydrolyzed epoxy material.

[0030] It also includes an emergency pipeline venting flame arrester 26 and a tail gas absorption unit 12. One end of the emergency pipeline venting flame arrester 26 is connected to the pipeline 1a, and the other end of the emergency pipeline venting flame arrester 26 is connected to the tail gas absorption unit 12. During the hydrolysis process, dangerous gas will be generated. The pressure is collected by the pressure sensor set on the hydrolysis kettle 1 to determine the gas pressure in the hydrolysis kettle 1. If the gas pressure is too high, the gas is transported to the tail gas absorption unit 12 after being processed by the emergency pipeline venting flame arrester 26, thereby avoiding safety accidents.

[0031] It also includes a sixth valve 27, a vacuum system 28, and a seventh valve 29. One end of the sixth valve 27 is connected to the pipeline 1a, and the other end of the sixth valve 27 is connected to the vacuum system 28. One end of the seventh valve 29 is connected to the buffer tank 11, and the other end of the seventh valve 29 is connected to the vacuum system 28.

[0032] It also includes a first pipeline flame arrester 30 and a first tail gas absorption unit 31. One end of the first pipeline flame arrester 30 is connected to the buffer tank 11, and the other end of the first pipeline flame arrester 30 is connected to the first tail gas absorption unit 31. The first tail gas absorption unit 31 is also connected to the safety valve 1e.

[0033] The above description is about one of the hydrolysis units. However, a plurality of hydrolysis units may be connected to the third pipe 14 and the vacuum system 28 so that the plurality of hydrolysis units are connected in parallel.

[0034] The working process steps of the utility model are as follows:

[0035] S1, open the fourth valve 10, the sixth valve 27 and the seventh valve 29, close the nitrogen filling port 1c, the safety valve 1e, the second valve 5, the third valve 7, and evacuate the hydrolysis kettle 1, the hydrolysis condenser 8 and the buffer tank 11 through the vacuum system 28 to evacuate the gas in the hydrolysis kettle 1, the hydrolysis condenser 8 and the buffer tank 11. After the vacuuming is completed, close the sixth valve 27 and the seventh valve 29.

[0036] S2, connect the first valve 3 with the feeding tank 2 and the first pipeline 4, open the first valve 3 and the second valve 5, input the nitrogen in the nitrogen storage tank 2c into the feeding tank 2, and press the propylene oxide liquid in the feeding tank 2 into the hydrolysis kettle 1 by the pressure of the nitrogen. When feeding, input nitrogen through the nitrogen filling port 1c for protection. When the propylene oxide liquid delivery reaches the specified value, stop delivering, and close the first valve 3 and the second valve 5.

[0037] S3, pump water into the water tank 6, the liquid level in the water tank 6 is detected by a liquid level sensor, open the third valve 7, input the water in the water tank 6 into the hydrolysis kettle 1 for reaction, and the liquid level in the hydrolysis kettle 1 is detected by a liquid level sensor installed in the hydrolysis kettle 1.

[0038] S4, close the third valve 7, connect the frozen brine water supply unit 21 with the water inlet valve 23, connect the frozen brine water return unit 22 with the water return valve 23a, open the water inlet valve 23 and the water return valve 23a, input the frozen brine into the space between the jacket 1b and the hydrolysis kettle 1, and circulate the frozen brine between the frozen brine water supply unit 21, the jacket 1b and the frozen brine water return unit 22 of the hydrolysis kettle 1, and cool the hydrolysis kettle 1 by the frozen brine. After the temperature in the hydrolysis kettle 1 is reduced to the process setting value, the chiral catalyst is added to the hydrolysis kettle 1 through the auxiliary feeding port 1d. After the chiral catalyst is added, the auxiliary feeding port 1d is closed, and the stirrer is turned on for stirring. After the stirring is completed and the temperature in the hydrolysis kettle 1 is stabilized, the third valve 7 is opened, and the water in the water tank 6 is added to the hydrolysis kettle 1 for reaction. During the reaction, the temperature in the hydrolysis kettle 1 is controlled by the frozen brine in the space between the jacket 1b and the hydrolysis kettle 1 until the reaction is completed.

[0039] During the reaction of the materials in the hydrolysis kettle 1, the fourth valve 10 is opened, and the gas generated in the hydrolysis kettle 1 enters the hydrolysis condenser 8 through the pipeline 1a. The gas is condensed by the hydrolysis condenser 8 and then flows into the buffer tank 11. The liquid in the buffer tank 11 is lowered into the material barrel 11a for barreling. The exhaust gas in the buffer tank 11 enters the first exhaust gas absorption unit 31 through the first pipeline flame arrester 30 for absorption.

[0040] S5, after the reaction is finished, the fourth valve 10 is closed and the safety valve 1e is opened. If gas is generated in the hydrolysis kettle 1 (only a small amount of gas is generated at this time), the gas enters the first tail gas absorption unit 31 through the safety valve 1e.

[0041] After the reaction is completed, disconnect the connection between the chilled brine water supply unit 21 and the water inlet valve 23, and disconnect the connection between the chilled brine water return unit 22 and the water return valve 23a, connect the water inlet valve 23 to the compressed air delivery device, and connect the water return valve 23a to the recovery container. The water inlet valve 23 and the water return valve 23a are in an open state, and compressed air is input into the space between the hydrolysis kettle 1 and the jacket 1b through the water inlet valve 23 to pressurize the chilled brine in the space. Close the water inlet valve 23 and the water return valve 23a, disconnect the first valve 3 from the feeding tank 2 and the first pipeline 4, and connect the first valve 3 to the third pipeline 14 and the epoxy receiving tank 15 to prepare for distillation and recovery of the product.

[0042] S6, the fourth valve 10 is closed, the fifth valve 13 is opened, the hydrolysis kettle 1 is connected in series with the hydrolysis condenser 8, the fifth valve 13, the third pipeline 14, and the epoxy receiving tank 15, the steam input valve 19 and the steam output valve 20 are opened, and the steam in the steam supply unit 16 is input into the space between the hydrolysis kettle 1 and the jacket 1b through the steam input valve 19, the hydrolysis kettle 1 is heated by the steam, and the product (propylene oxide) is recovered by distillation, and the product enters the epoxy receiving tank 15. The epoxy receiving tank 15 is provided with a pressure sensor, a temperature sensor, and a liquid level sensor, and the pressure, temperature, and liquid level in the epoxy receiving tank 15 are detected by these sensors.

[0043] S7, after the product recovery is completed, the hydrolysis kettle 1 is cooled down, the valve installed at the bottom of the hydrolysis kettle 1 is opened, and the remaining materials in the hydrolysis kettle 1 are output to the designated location.

[0044] Finally, it should be noted that the above-described implementation mode is only a preferred embodiment of the utility model to illustrate the technical solution of the utility model, and does not limit it, let alone limit the protection scope of the utility model; although the utility model is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the protection scope of the claims.

Claims

1. A chiral hydrolysis device for epoxy compounds, comprising a hydrolysis kettle (1), a feeding tank (2), a first valve (3), a first pipeline (4), a second valve (5), a water tank (6), and a third valve (7), wherein the feeding tank (2) is connected to one end of the first valve (3) during the feeding stage, the other end of the first valve (3) is connected to one end of the first pipeline (4) during the feeding stage, the other end of the first pipeline (4) is connected to the second valve (5), the second valve (5) is connected to a feeding port on the hydrolysis kettle (1), the output end of the water tank (6) is connected to one end of the third valve (7), and the other end of the third valve (7) is connected to the feeding port on the hydrolysis kettle (1), characterized in that: It also includes a pipeline (1a), a hydrolysis condenser (8), a second pipeline (9), a fourth valve (10), a buffer tank (11), a fifth valve (13), a third pipeline (14), an epoxy receiving tank (15), a steam supply unit (16), an input pipeline (17), an output pipeline (18), a steam input valve (19), and a steam output valve (20); The input end of the hydrolysis condenser (8) is connected to the hydrolysis kettle (1) through a pipeline (1a), the output end of the hydrolysis condenser (8) is connected to one end of a second pipeline (9), the other end of the second pipeline (9) is connected to one end of a fourth valve (10), the other end of the fourth valve (10) is connected to a buffer tank (11), one end of a fifth valve (13) is connected to the second pipeline (9), the other end of the fifth valve (13) is connected to one end of a third pipeline (14), the other end of the third pipeline (14) of the hydrolysis kettle (1) is connected to the other end of the first valve (3) during the distillation stage, and the other end of the first valve (3) is connected to an epoxy receiving tank (15); The hydrolysis kettle (1) is provided with a jacket (1b); a steam supply unit (16) is connected to one end of a steam input valve (19); the other end of the steam input valve (19) is connected to an input pipeline (17); the input pipeline (17) is connected to an input port provided on the jacket (1b); an output port provided on the jacket (1b) is connected to an output pipeline (18); and a steam output valve (20) is connected to the output pipeline (18).

2. The chiral hydrolysis device of epoxy compounds according to claim 1, characterized in that: It also includes a chilled brine water supply unit (21), a chilled brine water return unit (22), a water inlet valve (23), and a water return valve (23a); the chilled brine water supply unit (21) is connected to one end of the water inlet valve (23), the other end of the water inlet valve (23) is connected to an input pipeline (17), one end of the water return valve (23a) is connected to an output pipeline (18), and the other end of the water return valve (23a) is connected to the chilled brine water return unit (22).

3. The chiral hydrolysis device of epoxide according to claim 1, characterized in that: It also includes a cooling water supply unit (24), a cooling water return unit (25), an inlet valve (23), and a return valve (23a); the cooling water supply unit (24) is connected to one end of the inlet valve (23), the other end of the inlet valve (23) is connected to an input pipe (17), one end of the return valve (23a) is connected to an output pipe (18), and the other end of the return valve (23a) is connected to the cooling water return unit (25).

4. The chiral hydrolysis device of epoxide according to claim 1, characterized in that: It also comprises an emergency pipeline venting flame arrester (26) and a tail gas absorption unit (12), wherein one end of the emergency pipeline venting flame arrester (26) is connected to the pipeline (1a), and the other end of the emergency pipeline venting flame arrester (26) is connected to the tail gas absorption unit (12).

5. The chiral hydrolysis device of epoxide according to claim 1, characterized in that: It also includes a sixth valve (27), a vacuum pumping system (28), and a seventh valve (29), wherein one end of the sixth valve (27) is connected to the pipeline (1a), and the other end of the sixth valve (27) is connected to the vacuum pumping system (28); one end of the seventh valve (29) is connected to the buffer tank (11), and the other end of the seventh valve (29) is connected to the vacuum pumping system (28).

6. The chiral hydrolysis device of epoxide according to claim 1, characterized in that: It also comprises a first pipeline flame arrester (30) and a first tail gas absorption unit (31), wherein one end of the first pipeline flame arrester (30) is connected to the buffer tank (11), and the other end of the first pipeline flame arrester (30) is connected to the first tail gas absorption unit (31).

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