Synthetic system of carboxylic ester

Abstract

The utility model discloses a synthetic system of carboxylic ester. The synthetic system at least comprises a reactor; the dehydrating tower is connected with the reactor; the at least one heat exchanger is connected with one side, far away from the reactor, of the dehydrating tower; the at least one separation tank is connected with one side, far away from the dehydrating tower, of the heat exchanger; the reflux pump is arranged between the dehydration tower and the separation tank; the connecting pipeline is used for connecting adjacent equipment; the at least one first filling pipeline is connected with the separation tank; the at least one second filling pipeline is arranged on the connecting pipeline between the separation tank and the reflux pump; and the separation unit is connected with the dehydration tower. Through the carboxylic ester synthesis system provided by the utility model, the yield of carboxylic ester can be improved, the production cost is reduced, and the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of carboxylic acid ester synthesis, in particular to a carboxylic acid ester synthesis system. Background Art

[0002] As an important chemical intermediate, carboxylic acid esters have unique structures and diverse properties, and play an important role in the fields of food, flavors, cosmetics, personal care products, plastics, and medicine. However, the current synthesis system of carboxylic acid esters has problems such as high production energy consumption, high production cost, many side reactions, and low yield. Utility Model Content

[0003] The utility model aims to provide a carboxylic acid ester synthesis system, which can improve the output of carboxylic acid ester, reduce production costs and increase economic benefits.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model is implemented through the following technical solutions.

[0005] The utility model provides a carboxylic acid ester synthesis system, which at least comprises:

[0006] Reactor;

[0007] A dehydration tower connected to the reactor;

[0008] at least one heat exchanger connected to a side of the dehydration tower away from the reactor;

[0009] at least one separation tank connected to a side of the heat exchanger away from the dehydration tower;

[0010] A reflux pump, arranged between the dehydration tower and the separation tank;

[0011] Connect pipelines and adjacent equipment;

[0012] at least one first filling pipeline connected to the separation tank;

[0013] at least one second filling pipeline, disposed on the connecting pipe between the separation tank and the reflux pump; and

[0014] A separation unit is connected to the dehydration tower.

[0015] In one embodiment of the present invention, the separation unit is connected to a side of the dehydration tower close to the reactor.

[0016] In one embodiment of the present invention, the synthesis system comprises a first heat exchanger, and the first heat exchanger is connected to a side of the dehydration tower away from the reactor.

[0017] In one embodiment of the present invention, the synthesis system comprises a first separation tank, and the first separation tank is arranged on a side of the first heat exchanger away from the dehydration tower.

[0018] In one embodiment of the present invention, the synthesis system comprises a second heat exchanger, and the second heat exchanger is arranged on a side of the first separation tank away from the first heat exchanger.

[0019] In one embodiment of the present invention, the synthesis system comprises a second separation tank, and the second separation tank is arranged on a side of the second heat exchanger away from the first separation tank.

[0020] In an embodiment of the present invention, there is one first filling pipeline, and the first filling pipeline is connected to the first separation tank.

[0021] In an embodiment of the present invention, when there are multiple first filling pipelines, the multiple first filling pipelines are connected to the first separation tank.

[0022] In one embodiment of the utility model, the first separation tank is a gas-liquid separator, and the second separation tank is an oil-water separator.

[0023] In an embodiment of the present utility model, when there are multiple second filling pipelines, the multiple second filling pipelines are arranged on the connecting pipe between the separation tank and the reflux pump.

[0024] In summary, the utility model provides a carboxylic acid ester synthesis system, which directly utilizes ethylene and carboxylic acid for addition esterification, has a simple process and low production cost. Moreover, the synthesis system provided by the utility model can make the polymerization inhibitor evenly distributed inside the dehydration tower, thereby preventing the carboxylic acid ester from self-polymerizing at the bottom of the dehydration tower, thereby increasing the production of the carboxylic acid ester and increasing the economic benefits.

[0025] Of course, any method of implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 The figure is a schematic flow diagram of a synthesis system of a carboxylic acid ester in one embodiment of the present invention.

[0028] Marking Description:

[0029] 11. Reactor; 12. Dehydration tower; 131. First heat exchanger; 132. Second heat exchanger; 141. First separation tank; 142. Second separation tank; 15. Reflux pump; 16. First filling pipeline; 17. Second filling pipeline; 18. Connecting pipeline; 19. Separation unit. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations. The details in the present invention can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0032] In the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first" and "second" appear, they are only used for description and distinction purposes, and cannot be understood as indicating or implying relative importance.

[0033] In the synthesis system of carboxylic acid ester, a polymerization inhibitor must be added to prevent the carboxylic acid ester from self-polymerizing, thereby increasing the yield of the carboxylic acid ester product. In the synthesis system of carboxylic acid ester, when the polymerization inhibitor is added at the separation tank, the polymerization inhibitor is unevenly distributed in the dehydration tower, causing the carboxylic acid ester to self-polymerize at the bottom of the dehydration tower, affecting the yield of the carboxylic acid ester. The synthesis system of carboxylic acid ester provided by the utility model can make the polymerization inhibitor uniformly distributed inside the dehydration tower by adding the polymerization inhibitor at multiple points in the synthesis system, thereby preventing the carboxylic acid ester from self-polymerizing and increasing the yield of the carboxylic acid ester.

[0034] See also Figure 1As shown, the utility model provides a synthesis system of carboxylic acid ester, for example, including a reactor 11, a dehydration tower 12, a heat exchanger, a separation tank, a first filling pipeline 16, a second filling pipeline 17 and a connecting pipeline 18. Among them, the first filling pipeline 16 is connected to the separation tank, and the second filling pipeline 17 is arranged on the connecting pipeline 18 between the separation tank and the dehydration tower 12. The polymerization inhibitor is introduced into the synthesis system through the first filling pipeline 16 and the second filling pipeline 17. The polymerization inhibitor can be evenly dispersed in the synthesis system, especially in the dehydration tower 12, which can prevent the carboxylic acid ester at the bottom of the dehydration tower 12 from self-polymerization due to lack of polymerization inhibitor, thereby increasing the yield of carboxylic acid ester. Moreover, the synthesis system provided by the utility model directly utilizes ethylene and carboxylic acid for addition esterification, has a simple process and low production cost.

[0035] See also Figure 1 As shown, in one embodiment of the utility model, the reactor 11 provides a place for the reaction between the raw materials. The raw materials include, for example, ethylene, carboxylic acid, oxygen and a catalyst, and the catalyst includes, for example, at least one of a liquid acid catalyst, a molecular sieve and a silicon aluminum oxide catalyst, an ion exchange resin catalyst and a heteropolyacid catalyst, and the reactor 11 is, for example, a tubular reactor, a kettle reactor or a tower reactor. In the reactor 11, due to the catalytic action of the catalyst, ethylene and carboxylic acid undergo addition esterification. Specifically, ethylene undergoes a hydration reaction to generate ethanol, and the generated ethanol continues to undergo an esterification reaction with carboxylic acid to generate a carboxylic acid ester. Compared with the alcohol acid esterification method, in the synthesis system provided by the utility model, ethylene, a synthetic raw material of alcohol, is directly used for addition esterification with carboxylic acid, and the process is simple and the production cost is low.

[0036] See also Figure 1 As shown, in one embodiment of the utility model, the dehydration tower 12 is connected to the reactor 11 to remove moisture from the synthetic product. In this embodiment, the raw material reacts in the reactor 11, and after the synthetic product enters the dehydration tower 12, it rises from the connection between the dehydration tower 12 and the reactor 11 to the top of the dehydration tower 12 to remove moisture from the synthetic product and improve the purity of the carboxylic acid ester product.

[0037] See also Figure 1As shown, in one embodiment of the utility model, the heat exchanger is connected to the side of the dehydration tower 12 away from the reactor 11. Among them, there is at least one heat exchanger, for example. In this embodiment, there are two heat exchangers, for example, and the heat exchangers include a first heat exchanger 131 and a second heat exchanger 132, etc. The first heat exchanger 131 is connected to the top of the dehydration tower 12, and the second heat exchanger 132 is arranged on the side of the first separation tank 141 away from the first heat exchanger 131. After the synthetic product is dehydrated in the dehydration tower 12, it flows through the first heat exchanger 131, the first separation tank 141, the second heat exchanger 132 and the second separation tank 142 from the top of the dehydration tower 12 in sequence. The first heat exchanger 131 condenses the carboxylic acid ester in the synthetic product, and the carboxylic acid ester liquid is separated by the first separation tank 141. The second heat exchanger 132 continues to cool the carboxylic acid ester liquid, and the carboxylic acid ester crude product is separated by the second separation tank 142. In this embodiment, the heat exchanger is, for example, a tubular heat exchanger, a plate heat exchanger, or a coiled-tube heat exchanger.

[0038] See also Figure 1 As shown, in one embodiment of the utility model, the separation tank is connected to the side of the heat exchanger away from the dehydration tower 12. Among them, there is at least one separation tank, for example. In this embodiment, there are two separation tanks, for example, the separation tanks include a first separation tank 141 and a second separation tank 142, the first separation tank 141 is, for example, arranged on the side of the first heat exchanger 131 away from the dehydration tower 12, and the second separation tank 142 is, for example, arranged on the side of the second heat exchanger 132 away from the first separation tank 141. After the synthetic product is dehydrated by the dehydration tower 12, the gas flows through the first heat exchanger 131 and the first separation tank 141 from the top of the dehydration tower 12, and the first heat exchanger 131 condenses the carboxylic acid ester in the synthetic product, and the gas-liquid mixture flowing out of the first heat exchanger 131 is separated into gas and liquid in the first separation tank 141, and the uncondensed gas enters the reactor 11 from the top of the first separation tank 141 to continue the reaction, and the condensed carboxylic acid ester liquid flows from the bottom of the first separation tank 141 through the second heat exchanger 132 and the second separation tank 142. The second heat exchanger 132 cools the carboxylate liquid again, and the second separation tank 142 separates the carboxylate and water in the carboxylate liquid to obtain a crude carboxylate product, which flows out from the bottom of the second separation tank 142. In this embodiment, the first separation tank 141 is, for example, a gas-liquid separator, and the second separation tank 142 is, for example, an oil-water separator.

[0039] See also Figure 1 As shown, in one embodiment of the utility model, a reflux pump 15 is arranged between the dehydration tower 12 and the separation tank to send the crude carboxylate product flowing out of the bottom of the separation tank into the dehydration tower 12. The reflux pump 15 is, for example, a centrifugal pump, a gear pump, a reciprocating pump, a piston pump or a diaphragm pump, etc., to increase the pressure of the crude carboxylate product so that the crude carboxylate product can smoothly enter the dehydration tower 12.

[0040] See also Figure 1 As shown, in one embodiment of the utility model, the first filling pipeline 16 is connected to the separation tank. Among them, the first filling pipeline 16 is, for example, at least one. In this embodiment, the first filling pipeline 16 is, for example, one, and the first filling pipeline 16 is, for example, connected to the first separation tank 141. Through the first filling pipeline 16, the inhibitor is added to the bottom of the first separation tank 141, and part of the inhibitor flows through the second heat exchanger 132, the second separation tank 142, the reflux pump 15 and the dehydration tower 12 together with the carboxylic acid ester liquid at the bottom of the first separation tank 141 to prevent the carboxylic acid ester from self-polymerizing. Among them, the inhibitor includes, for example, at least one of a phenolic inhibitor, a quinone inhibitor, an aromatic amine inhibitor and a free radical inhibitor, and another example is 4-hydroxy-2,2,6,6-tetramethylpiperidinyl nitroxide free radical. In other embodiments of the present invention, there are, for example, multiple first filling pipelines 16 , and the multiple first filling pipelines 16 are connected to the first separation tank 141 to improve the efficiency of adding the inhibitor into the synthesis system.

[0041] See also Figure 1 As shown, in one embodiment of the utility model, the second filling pipeline 17 is arranged on the connecting pipeline 18 between the separation tank and the reflux pump 15, and is used to add the inhibitor to the crude carboxylic ester product. Among them, the second filling pipeline 17 is, for example, at least one. In this embodiment, the second filling pipeline 17 is, for example, one, and the second filling pipeline 17 is arranged on the connecting pipeline 18 between the second separation tank 142 and the reflux pump 15. Since the first filling pipeline 16 is far away from the dehydration tower 12, the inhibitor added by the first filling pipeline 16 is unevenly distributed in the dehydration tower 12, especially the bottom of the dehydration tower 12 contains almost no inhibitor. Therefore, the inhibitor is added to the connecting pipe 18 between the second separation tank 142 and the reflux pump 15 through the second filling pipeline 17, and the inhibitor enters the dehydration tower 12 through the reflux pump 15 together with the crude carboxylate product in the connecting pipe 18, thereby improving the uniform distribution of the inhibitor in the dehydration tower 12, increasing the inhibitor content at the bottom of the dehydration tower 12, and avoiding the self-polymerization of the carboxylate at the bottom of the dehydration tower 12, thereby increasing the yield of the carboxylate. Among them, the inhibitor includes, for example, at least one of a phenol inhibitor, a quinone inhibitor, an aromatic amine inhibitor, and a free radical inhibitor, and another example is 4-hydroxy-2,2,6,6-tetramethylpiperidinium nitroxide free radical. In other embodiments of the utility model, the second filling pipeline 17 is, for example, multiple, and multiple second filling pipelines 17 are arranged on the connecting pipe 18 between the separation tank and the reflux pump 15 to improve the efficiency of adding the inhibitor to the synthesis system.

[0042] See also Figure 1As shown, in one embodiment of the utility model, the separation unit 19 is connected to the dehydration tower 12 for purifying the crude carboxylic acid ester product. In this embodiment, the separation unit 19 is connected to the bottom of the dehydration tower 12, for example. In the reactor 11, side reactions inevitably occur between the raw materials, so the crude carboxylic acid ester product needs to be separated and purified to obtain a carboxylic acid ester product of qualified purity. The crude carboxylic acid ester product transported by the reflux pump 15 enters the dehydration tower 12, and converges to the bottom of the dehydration tower 12 due to gravity. The separation unit 19 extracts the crude carboxylic acid ester product at the bottom of the dehydration tower 12 for separation and purification. The carboxylic acid ester product separated by the separation unit 19 is extracted and sold, and the impurities separated by the separation unit 19 are incinerated as waste liquid. Among them, the separation unit 19 includes, for example, a plate distillation tower or a packed distillation tower, and the utility model does not limit the type of the separation unit 19.

[0043] See also Figure 1 As shown, in one embodiment of the present invention, a connecting pipe 18 is arranged between adjacent devices to realize material transportation between adjacent devices. The material of the connecting pipe 18 includes at least one of carbon steel, stainless steel, polyurethane and polytetrafluoroethylene.

[0044] In summary, the utility model provides a carboxylic acid ester synthesis system, which directly uses ethylene and carboxylic acid to synthesize carboxylic acid ester by addition esterification, has a simple process and low production cost. Moreover, the carboxylic acid ester synthesis system provided by the utility model can evenly distribute the polymerization inhibitor in the dehydration tower through the first filling pipeline and the second filling pipeline, thereby preventing the carboxylic acid ester from self-polymerizing at the bottom of the dehydration tower, thereby increasing the production of carboxylic acid ester and increasing economic benefits.

[0045] References throughout the specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that the specific features, structures, or characteristics described in conjunction with the embodiment are included in at least one embodiment of the utility model, and not necessarily in all embodiments. Thus, the various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics of any specific embodiment of the utility model may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the utility model embodiments described and shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the utility model.

[0046] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the concept of the utility model, such as the technical solution formed by replacing the above-mentioned features with the technical features with similar functions disclosed in this application (but not limited to). In addition to the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present utility model, the remaining technical features will not be repeated here.

Claims

1. A synthesis system for carboxylic acid esters, characterized in that: At least: Reactor; A dehydration tower connected to the reactor; at least one heat exchanger connected to a side of the dehydration tower away from the reactor; at least one separation tank connected to a side of the heat exchanger away from the dehydration tower; A reflux pump, arranged between the dehydration tower and the separation tank; Connect pipelines and adjacent equipment; at least one first filling pipeline connected to the separation tank; at least one second filling pipeline, disposed on the connecting pipeline between the separation tank and the reflux pump; as well as A separation unit is connected to the dehydration tower.

2. The synthesis system according to claim 1, characterized in that: The separation unit is connected to a side of the dehydration tower close to the reactor.

3. The synthesis system according to claim 1, characterized in that: The synthesis system includes a first heat exchanger connected to a side of the dehydration tower away from the reactor.

4. The synthesis system according to claim 3, characterized in that: The synthesis system includes a first separation tank, which is arranged on a side of the first heat exchanger away from the dehydration tower.

5. The synthesis system according to claim 4, characterized in that: The synthesis system includes a second heat exchanger, which is disposed on a side of the first separation tank away from the first heat exchanger.

6. The synthesis system according to claim 5, characterized in that: The synthesis system includes a second separation tank, which is arranged on a side of the second heat exchanger away from the first separation tank.

7. The synthesis system according to claim 6, characterized in that: There is one first filling pipeline, and the first filling pipeline is connected to the first separation tank.

8. The synthesis system according to claim 6, characterized in that: When there is a plurality of the first filling pipelines, the plurality of the first filling pipelines are connected to the first separation tank.

9. The synthesis system according to claim 6, characterized in that: The first separation tank is a gas-liquid separator, and the second separation tank is an oil-water separator.

10. The synthesis system according to claim 1, characterized in that: When there are multiple second filling pipelines, the multiple second filling pipelines are arranged on the connecting pipe between the separation tank and the reflux pump.

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