Device for separating inorganic salt from 1, 4-butylene glycol

Abstract

The utility model belongs to the technical field of 1, 4-butenediol processing, and particularly relates to a device for separating inorganic salt in 1, 4-butenediol, which is connected with a hydrogenated liquid storage tank through a BED hydrogenation section, is sent to a distillation kettle through a hydrogenated liquid feeding pump, enters a dehydration kettle after gas phase condensation of the distillation kettle, and is sent to an incinerator for incineration. A BED crude product obtained after dehydration of the dehydration kettle is sent to a crude product storage tank and is sent to a rectification system through a BED feeding pump to be rectified to obtain a final qualified product, and dehydration kettle liquid is sent to an incinerator to be incinerated. According to the present invention, with the process, the inorganic salt in the crude product is substantially reduced, the problem of frequent blockage of the dehydration kettle discharge pipeline is solved, and the qualified 1, 4-butylene glycol product can be successfully produced from the high-salt-content raw material 1, 4-butynediol (propargyl alcohol by-product).

Description

Technical Field

[0001] The utility model relates to the technical field of 1,4 - butanediol processing, and specifically relates to a device for separating inorganic salts in 1,4 - butanediol. Background Technique

[0002] 1,4 - butanediol is a colorless liquid under normal temperature and pressure, and is easily soluble in water and most organic solvents. It is a polar molecule, and the two hydroxyl functional groups therein can form hydrogen bond interactions with water molecules. 1,4 - butanediol can undergo many organic reactions, such as esterification, etherification, alkylation, and oxidation. In addition, it can also participate in polymerization reactions as a monomer to prepare high - molecular materials such as polyesters.

[0003] Among all the enterprises in China where the production of 1,4 - butanediol (BED) has been established, the batch production process is adopted. The core technology is the preparation of Lindlar catalyst. The main sources of raw material 1,4 - butynediol (BYD) for producing BED are the aldehyde - alkyne method and by - product of propargyl alcohol. The salt content in the original BYD is high, resulting in frequent blockages at the discharge port and discharge pipeline of the dehydration section of the BED production process, seriously affecting the production capacity of BED. Content of the Utility Model

[0004] The purpose of this part is to outline some aspects of the implementation mode of the utility model and briefly introduce some preferred implementation modes. Some simplifications or omissions may be made in this part, as well as in the abstract of the specification and the title of the utility model of this application, to avoid obscuring the purpose of this part, the abstract of the specification, and the title of the utility model. However, such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the problems existing in the existing device for separating inorganic salts in 1,4 - butanediol, the utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a device for separating inorganic salts in 1,4 - butanediol. The BED hydrogenation section is connected to a hydrogenated liquid storage tank, and is pumped to a distillation kettle through a hydrogenated liquid feed pump. After the gas phase of the distillation kettle is condensed, it enters a dehydration kettle. The distillation kettle liquid is sent to an incinerator for incineration. After dehydration in the dehydration kettle, the BED crude product is sent to a crude product storage tank, and is pumped to a rectification system through a BED feed pump for rectification to obtain the final qualified product. The dehydration kettle liquid is sent to the incinerator for incineration.

[0007] To solve the above - mentioned technical problems, according to one aspect of the utility model, the following technical solutions are provided:

[0008] An apparatus for separating inorganic salts from 1,4 - butanediol, which comprises a hydrogenation section and a rectification section; the hydrogenation section is connected to a hydrogenated liquid storage tank, the hydrogenated liquid storage tank is connected to a distillation kettle, the distillation kettle is connected to a distillation condenser, the distillation condenser is connected to a dehydration kettle, the dehydration kettle is connected to a crude product storage tank, the crude product storage tank is connected to a crude product feed pump, and the crude product feed pump is connected to the rectification section end.

[0009] As a preferred embodiment of the apparatus for separating inorganic salts from 1,4 - butanediol according to the present utility model, wherein: a hydrogenated liquid feed pump is provided between the pipeline connecting the hydrogenated liquid storage tank and the distillation kettle, and the liquid inlet end and the liquid outlet end of the hydrogenated liquid feed pump are respectively connected to the hydrogenated liquid storage tank and the distillation kettle.

[0010] As a preferred embodiment of the apparatus for separating inorganic salts from 1,4 - butanediol according to the present utility model, wherein: a coke oil pump is further connected to the distillation kettle, the other end of the coke oil pump is connected to the incinerator section, and the feed end and the discharge end of the coke oil pump are respectively connected to the distillation kettle and the incinerator.

[0011] As a preferred embodiment of the apparatus for separating inorganic salts from 1,4 - butanediol according to the present utility model, wherein: a dehydration condenser is connected above the dehydration kettle, and the dehydration condenser is connected to a pre - boiling tank.

[0012] As a preferred embodiment of the apparatus for separating inorganic salts from 1,4 - butanediol according to the present utility model, wherein: a crude product discharge pump is provided on the pipeline connecting the dehydration kettle and the crude product storage tank, and the feed end and the discharge end of the crude product discharge pump are respectively connected to the crude product storage pipe and the crude product storage tank.

[0013] Compared with the prior art, the beneficial effects of the present utility model are: through the connection of the BED hydrogenation section to the hydrogenated liquid storage tank, it is sent to the distillation kettle through the hydrogenated liquid feed pump, the gas phase of the distillation kettle is condensed and then enters the dehydration kettle, the liquid of the distillation kettle is sent to the incinerator for incineration, the BED crude product obtained after dehydration in the dehydration kettle is sent to the crude product storage tank, and is sent to the rectification system for rectification to obtain the final qualified product, and the liquid of the dehydration kettle is sent to the incinerator for incineration.

[0014] 1. Significantly reduced the inorganic salts in the crude product, from 0.5 - 1.5% to 0.01 - 0.1%, achieving effective separation.

[0015] 2. Solved the problem of frequent blockage of the discharge pipeline of the dehydration kettle.

[0016] 3. Successfully realized the production of qualified 1,4 - butanediol products from the raw material 1,4 - butynediol (by - product of propynol) with high salt content. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the present utility model will be described in detail below in conjunction with the accompanying drawings and detailed embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0018] Figure 1 It is a schematic flow diagram of the present utility model.

[0019] In the figure: 1 - hydrogenation section, 2 - hydrogenated liquid storage tank, 3 - hydrogenated liquid feed pump, 4 - distillation kettle, 5 - distillation condenser, 6 - coke pump, 7 - incinerator section, 8 - dehydration kettle, 9 - dehydration condenser, 10 - crude product discharge pump, 11 - pre-boiling tank, 12 - crude product storage tank, 13 - crude product feed pump, 14 - rectification section. Detailed Embodiments

[0020] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following detailed description of the specific embodiments of the present utility model will be made in conjunction with the accompanying drawings.

[0021] Many specific details are set forth in the following description to facilitate a thorough understanding of the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0022] Secondly, the present utility model is described in detail in conjunction with the schematic diagrams. When detailing the embodiments of the present utility model, for ease of explanation, the cross-sectional views showing the device structure will be enlarged locally out of proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present utility model herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0023] To make the purpose, technical solutions, and advantages of the present utility model clearer, the following will further describe the embodiments of the present utility model in detail in conjunction with the accompanying drawings.

[0024] The utility model provides the following technical solution: A device for separating inorganic salts from 1,4-butanediol. During use, it is connected to a hydrogenation liquid storage tank through the BED hydrogenation section, and is sent to a distillation kettle through a hydrogenation liquid feed pump. After the gas phase of the distillation kettle is condensed, it enters a dehydration kettle. The liquid in the distillation kettle is sent to an incinerator for incineration. After dehydration in the dehydration kettle, the crude BED product is sent to a crude product storage tank, and then sent to a rectification system through a BED feed pump for rectification to obtain the final qualified product. The liquid in the dehydration kettle is sent to the incinerator for incineration. The inorganic salts in the crude product are significantly reduced, from 0.5 - 1.5% to 0.01 - 0.1%, achieving effective separation. It solves the problem of frequent blockage of the discharge pipeline of the dehydration kettle. It successfully realizes the production of qualified 1,4-butanediol products from raw materials with high salt content, such as 1,4-butynediol (by-product of propargyl alcohol).

[0025] Figure 1 Shown is a structural schematic diagram of the first embodiment of a device for separating inorganic salts from 1,4-butanediol according to the utility model. Please refer to Figure 1 , A device for separating inorganic salts from 1,4-butanediol in this embodiment, its main part includes a hydrogenation section 1 and a rectification section 14;

[0026] The hydrogenation section 1 is connected to a hydrogenation liquid storage tank 2, the hydrogenation liquid storage tank 2 is connected to a distillation kettle 4, the distillation kettle 4 is connected to a distillation condenser 5, the distillation condenser 5 is connected to a dehydration kettle 8, the dehydration kettle 8 is connected to a crude product storage tank 12, the crude product storage tank 12 is connected to a crude product feed pump 13, and the crude product feed pump 13 is connected to the rectification section 14. Specifically, a hydrogenation liquid feed pump 3 is provided between the pipeline connecting the hydrogenation liquid storage tank 2 and the distillation kettle 4. The liquid inlet end and the liquid outlet end of the hydrogenation liquid feed pump 3 are respectively connected to the hydrogenation liquid storage tank 2 and the distillation kettle 4. A coke oil pump 6 is also connected to the distillation kettle 4, and the other end of the coke oil pump 6 is connected to the incinerator section 7. The feed end and the discharge end of the coke oil pump 6 are respectively connected to the distillation kettle 4 and the incinerator. A dehydration condenser 9 is connected above the dehydration kettle 8, the dehydration condenser 9 is connected to a pre-boiler 11, and a crude product discharge pump 10 is provided on the pipeline connecting the dehydration kettle 8 and the crude product storage tank 12. The feed end and the discharge end of the crude product discharge pump 10 are respectively connected to the crude product storage pipe and the crude product storage tank 12. The hydrogenation section 1 is used to add hydrogen to 1,4-butynediol. The hydrogenation liquid storage tank is used to store the hydrogenated 1,4-butynediol liquid. The distillation kettle 4 is used to distill the hydrogenation liquid. The distilled hydrogenation liquid is cooled by the distillation condenser 5 and enters the dehydration kettle 8 for dehydration. The remaining kettle liquid is sent to the incinerator for incineration through the coke oil pump 6. The kettle liquid in the dehydration kettle 8 is dehydrated to obtain a crude BED product (BED 95 - 97%, water 0.5 - 2%). The crude product is sent to the crude product storage tank through the crude product discharge pump 10. The crude product storage tank sends the crude product to the rectification section 14 through the crude product feed pump 13 for rectification and discharge, obtaining BED (BED 98 - 99%, water 0.1 - 1%).

[0027] Combined withFigure 1 , The device for separating inorganic salts in 1,4 - butanediol according to this embodiment has the following specific working principle. The BED hydrogenation section 1 is connected to the hydrogenated liquid storage tank 2 and is sent to the distillation kettle 4 through the hydrogenated liquid feed pump 3. After the gas phase of the distillation kettle 4 is condensed, it enters the dehydration kettle 8. The liquid of the distillation kettle 4 is sent to the incinerator for incineration. After dehydration in the dehydration kettle 8, the BED crude product is sent to the crude product storage tank 12 and then sent to the rectification system through the BED feed pump for rectification to obtain the final qualified product. The liquid of the dehydration kettle 8 is sent to the incinerator for incineration.

[0028] 1. After the selective hydrogenation and filtration of 1,4 - butynediol, a hydrogenated liquid (BED 45 - 55%, water 43 - 53%) is obtained.

[0029] 2. The hydrogenated liquid is distilled (temperature 150 - 200 °C, pressure 5 - 30 kpag) to obtain a BED (65 - 75%, water 23 - 33%) material, and the residual kettle liquid is sent to the incinerator for incineration.

[0030] 3. The distilled material enters the dehydration kettle 8 for dehydration (temperature 110 - 160 °C, pressure 10 - 30 kpag) to obtain a BED (BED 95 - 97%, water 0.5 - 2%) crude product.

[0031] 4. The crude product enters the rectification section 14 for further refinement to obtain the product BED (BED 98 - 99%, water 0.1 - 1%).

[0032] Although the present utility model has been described above with reference to the embodiments, various improvements can be made to it and its components can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present utility model can be combined with each other in any way. The reason for not exhaustively describing these combinations in this specification is only to save space and resources. Therefore, the present utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An apparatus for separating inorganic salts from 1,4 - butanediol, characterized in that: It includes a hydrogenation section (1) and a rectification section (14); The hydrogenation section (1) is connected to a hydrogenated liquid storage tank (2), the hydrogenated liquid storage tank (2) is connected to a distillation kettle (4), the distillation kettle (4) is connected to a distillation condenser (5), the distillation condenser (5) is connected to a dehydration kettle (8), the dehydration kettle (8) is connected to a crude product storage tank (12), the crude product storage tank (12) is connected to a crude product feed pump (13), and the crude product feed pump (13) is connected to the rectification section (14).

2. The device for separating inorganic salts in 1,4 - butanediol according to claim 1, wherein: A hydrogenated liquid feed pump (3) is provided between the pipeline connecting the hydrogenated liquid storage tank (2) and the distillation kettle (4). The liquid inlet end and the liquid outlet end of the hydrogenated liquid feed pump (3) are respectively connected to the hydrogenated liquid storage tank (2) and the distillation kettle (4).

3. The device for separating inorganic salts from 1,4-butanediol according to claim 1, wherein: A coke oil pump (6) is also connected to the distillation kettle (4). The other end of the coke oil pump (6) is connected to an incinerator section (7). The feed end and the discharge end of the coke oil pump (6) are respectively connected to the distillation kettle (4) and the incinerator.

4. The device for separating inorganic salts in 1,4-butanediol according to claim 1, characterized in that: A dehydration condenser (9) is connected above the dehydration kettle (8), and the dehydration condenser (9) is connected to a pre-boiling tank (11).

5. The device for separating inorganic salts from 1,4 - butanediol according to claim 1, wherein: A crude product discharge pump (10) is provided on the pipeline connecting the dehydration kettle (8) and the crude product storage tank (12). The feed end and the discharge end of the crude product discharge pump (10) are respectively connected to the crude product storage pipe and the crude product storage tank (12).

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