CN218307871U

CN218307871U - PBT polymerization facility's full recycling system of low-purity BDO

Info

Publication number: CN218307871U
Application number: CN202222300069.9U
Authority: CN
Inventors: 马俊夫; 宋占尚; 苑青雷
Original assignee: Kanghui New Material Technology Co Ltd
Current assignee: Kanghui New Material Technology Co Ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-01-17
Anticipated expiration: 2032-08-31

Abstract

The utility model relates to a chemical production field especially relates to a PBT polymerization facility's full recycling system of low-purity BDO. Including SBD intermediate tank, process tower, esterification reaction cauldron, recovery unit, its characterized in that: the SBD intermediate tank is connected with the process tower through a second transmission and distribution pipe, and a mass flow meter for monitoring flow and a valve for controlling flow are arranged on a pipeline of the second transmission and distribution pipe; the process tower is connected with the esterification reaction kettle through a third transmission and distribution pipe and a fourth transmission and distribution pipe, so that a circulation loop is formed between the process tower and the esterification reaction kettle, the process tower is also provided with a byproduct outlet, and the byproduct outlet is connected with a recovery device through a fifth transmission and distribution pipe; the method aims to realize the complete recycling of the polluted BD under the condition of no disturbance to the device and avoid the waste of raw materials.

Description

PBT polymerization facility's full recycling system of low-purity BDO

Technical Field

The utility model relates to a chemical production field especially relates to a PBT polymerization facility's full recycling system of low-purity BDO.

Background

BDO is named butanediol as an important organic chemical and fine chemical raw material and is a basic raw material for producing polybutylene terephthalate (PBT) engineering plastics and PBT fibers.

In the process of parking and overhauling the PBT device, due to the fact that the water content and the tetrahydrofuran content are high and the hue is poor, dirty BD can be generated (wherein the main component of the dirty BD is butanediol which is used by a system and has lower purity and poorer quality), and the dirty BD can be directly recycled to have certain influence on product indexes, the dirty BD needs to be manually returned to an SBD middle tank (wherein the main component of the SBD is the butanediol and the quality of the butanediol is between BDO and the dirty BD), rectification and purification are carried out through a process tower, after the purified dirty BD is filtered, one part of the purified dirty BD can directly enter an esterification system to participate in esterification reaction, and the other part of the purified dirty BD participates in preparation of slurry.

The prior technical scheme is as follows: the manual ton bucket that will be equipped with dirty BD shifts to SBD middle tank top, is connected with it by metal collapsible tube, realizes what of the feed volume through the control to the valve aperture. The scheme has the advantages of more manpower and material resources consumption, large work labor amount, low efficiency, incapability of accurately controlling the recycling amount and easiness in causing the fluctuation of product indexes.

Therefore, an implementation scheme which can save manpower and material resources, accurately control the amount of the recycled BD and realize zero waste of raw materials is urgently needed.

SUMMERY OF THE UTILITY MODEL

(one) the utility model discloses mainly to above problem, provided a PBT polymerization facility's full recycling system of low-purity BDO, its purpose is that realize dirty BD all retrieval and utilization under the circumstances to the device no disturbance, avoid the waste of raw materials.

In order to achieve the purpose, the utility model provides a low-purity BDO full recycling system of a PBT polymerization device, which comprises an SBD middle groove, a process tower, an esterification reaction kettle and a recycling device, wherein the SBD middle groove is connected with the process tower through a second conveying and distributing pipe, and a mass flowmeter for monitoring the flow and a valve for controlling the flow are arranged on the pipeline of the second conveying and distributing pipe; the process tower is connected with the esterification reaction kettle through a third transmission and distribution pipe and a fourth transmission and distribution pipe, so that a circulation loop is formed between the process tower and the esterification reaction kettle, and the process tower is also provided with a byproduct outlet which is connected with a recovery device through a fifth transmission and distribution pipe.

Further, the feed end of the SBD middle groove is connected with the BD storage tank through a first transmission and distribution pipe.

Further, a material injection port is formed in the BD storage tank.

Further, a mass flow meter is arranged on a first transmission and distribution pipe between the BD storage tank and the SBD middle tank.

Furthermore, the pipelines connected among the BD storage tank, the SBD intermediate tank, the process tower, the esterification reaction kettle and the recovery device are all provided with valves.

Furthermore, a BD filter is arranged on a third transmission pipe connected between the process tower and the esterification reaction kettle.

Further, the discharge end of the BD filter is connected with the SBD collecting tank through a sixth transmission and distribution pipe.

Further, the discharge end of the SBD collecting tank is connected with the slurry preparation tank through a seventh transmission and distribution pipe.

Further, a stirrer is arranged in the slurry preparation tank, and the stirrer is driven by a motor.

Furthermore, a man-shaped inspection hole is formed below the esterification reaction kettle.

(III) advantageous effects

The above technical scheme of the utility model have following advantage: because the pipeline of the second transmission pipe is provided with the mass flow meter for monitoring the flow and the valve for controlling the flow, the return amount of the process tower can be scientifically adjusted; in addition, because a circulation loop is formed between the process tower and the esterification reaction kettle, the dirty BD is completely recycled while the index requirement is met, the consumption of fresh BD is saved, zero waste of BD is realized, and the purposes of saving production cost and creating production benefit are achieved.

Drawings

FIG. 1 is a schematic structural diagram of a low-purity BDO full-recycling system of a PBT polymerization device provided by the embodiment of the utility model;

in the figure: 1. a BD storage tank; 2. an SBD intermediate tank; 3. a process tower; 4. an esterification reaction kettle; 5. SBD collecting tank; 6. a slurry preparation tank; 7. a BD filter; 8. a recovery unit; 101. a first transfer pipe; 102. a second transfer pipe; 103. a third transfer pipe; 104. a fourth transfer pipe; 105. A fifth transfer pipe; 106. a sixth transfer pipe; 107. a seventh transfer line; 108. an eighth transfer pipe; 109. a ninth transfer line.

Detailed Description

The following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical scheme of the disclosure will be described by taking a low-purity BDO full recycling system of a PBT polymerization device disclosed by the application as an example.

According to an example of the present disclosure, as shown in fig. 1, the recycling system includes: groove 2 in the middle of the SBD, process tower 3, esterification reaction cauldron 4, recovery unit 8, groove 2 in the middle of the SBD connect process tower 3 through second transfer pipe 102, and be equipped with the mass flow meter (not shown) of monitoring flow and the valve that is used for the control flow on the pipeline of second transfer pipe 102, set up automatic liquid level in groove 2 in the middle of the SBD, through mass flow meter with the nimble extraction of dirty BD shift to process tower 3 and purify, replace on-the-spot manual control, when using manpower sparingly, can reach the accurate of volume of returning again and control, reduce the unpredictable risk that on-the-spot manual control brought.

Referring to fig. 1, the process tower 3 is connected to the esterification reaction kettle 4 through a third pipeline 103 and a fourth pipeline 104, so as to form a circulation loop between the process tower 3 and the esterification reaction kettle 4, wherein the discharge end of the process tower 3 is connected to the feed end of the esterification reaction kettle 4 through the third pipeline 103, the first discharge end of the esterification reaction kettle 4 is connected to the feed end of the process tower 3 through the fourth pipeline 104, the second discharge end of the esterification reaction kettle 4 enters the next stage reaction through a ninth pipeline 109, the process tower 3 is further provided with a byproduct outlet, and the byproduct outlet is connected to the recycling device 8 through a fifth pipeline 105. It can be understood that the purified BD directly enters the esterification reaction kettle 4 to participate in the esterification reaction, and the byproduct THF (all called tetrahydrofuran) generated in the reaction is returned to the process tower 3 through the fourth pipeline 104, and transferred to the recovery device 8 through the fifth pipeline 105 for collection. The circulating loop formed between the process tower 3 and the esterification reaction kettle 4 can recycle all the polluted BD, thereby not only saving the using amount of fresh polluted BD, but also realizing zero waste of the polluted BD.

As shown in FIG. 1, the recycling system comprises a BD storage tank 1, a feed end of an SBD intermediate tank 2 is connected with the BD storage tank 1 through a first pipeline 101, a material injection port is arranged above the BD storage tank 1, and the contained materials are put into the BD storage tank 1 for storage; a mass flow meter is provided in the first transfer pipe 101 between the BD tank 1 and the SBD intermediate tank 2, and the amount of feed is further controlled.

As a preferable scheme of the above embodiment, valves may be provided on the pipelines between the units; namely, valves are arranged on pipelines connected among the BD storage tank 1, the SBD intermediate tank 2, the process tower 3, the esterification reaction kettle 4 and the recovery device 8 so as to adjust the opening degree of the flow.

In some embodiments, the contaminated BD purified by the process tower 3 needs to be filtered by the BD filter 7 and then enter the esterification reaction kettle 4 to participate in the esterification reaction or enter the slurry preparation tank 6 through the SBD collection tank 5 to participate in the slurry preparation, wherein the discharge end of the BD filter 7 is connected to the SBD collection tank 5 through a sixth transmission pipe 106, the SBD collection tank 5 can be communicated with the slurry preparation tank 6 through a seventh transmission pipe 107, a stirrer is arranged in the slurry preparation tank 6 and driven by a motor to ensure uniform mixing of the slurry preparation, the prepared slurry enters a next stage reaction through an eighth transmission pipe 108, and the esterification reaction product enters a next stage reaction through a ninth transmission pipe 109.

Preferably, a man-shaped inspection hole for safety inspection and inspection is arranged below the esterification reaction kettle 4.

In summary, the dirty BD enters the SBD intermediate tank 2 from the BD storage tank 1 through the mass flow meter, the SBD intermediate tank 2 is provided with an automatic liquid level, the dirty BD is flexibly extracted and transferred to the process tower 3 through the mass flow meter for purification, the purified dirty BD can directly enter the esterification reaction kettle 4 for esterification reaction after being filtered through the BD filter 7 or enter the slurry preparation tank 6 for slurry preparation through the SBD collection tank 5, and the byproduct THF generated in the reaction is transferred to the recovery device 8 through the process tower 3 through the fourth transmission pipe 104 and the fifth transmission pipe 105 for collection. The amount of the BD discharged to the process tower 3 can be scientifically adjusted according to the analysis index of the slices, and the dirty BD is completely recycled while the index requirement is met, so that the amount of the fresh BD is saved, and zero waste of the BD is realized.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a PBT polymerization facility's full recycling system of low-purity BDO, includes SBD intermediate tank, process tower, esterification reaction cauldron, recovery unit, its characterized in that: the SBD intermediate tank is connected with the process tower through a second transmission and distribution pipe, and a mass flow meter for monitoring flow and a valve for controlling flow are arranged on a pipeline of the second transmission and distribution pipe; the process tower is connected with the esterification reaction kettle through a third transmission and distribution pipe and a fourth transmission and distribution pipe, so that a circulation loop is formed between the process tower and the esterification reaction kettle, the process tower is also provided with a byproduct outlet, and the byproduct outlet is connected with a recovery device through a fifth transmission and distribution pipe.

2. The low-purity BDO full recycling system of the PBT polymerization device according to claim 1, which is characterized in that: and the feeding end of the SBD middle groove is connected with the BD storage tank through a first transmission and distribution pipe.

3. The low-purity BDO full recycling system of the PBT polymerization device according to claim 2, which is characterized in that: and a material injection port is arranged on the BD storage tank.

4. The low-purity BDO full recycling system of the PBT polymerization device according to claim 2, which is characterized in that: and a mass flowmeter is arranged on a first transmission and distribution pipe between the BD storage tank and the SBD intermediate tank.

5. The low-purity BDO full recycling system of the PBT polymerization device according to claim 2, which is characterized in that: and valves are arranged on pipelines connected among the BD storage tank, the SBD intermediate tank, the process tower, the esterification reaction kettle and the recovery device.

6. The low-purity BDO full recycling system of the PBT polymerization device according to claim 1, which is characterized in that: and a BD filter is arranged on a third transmission pipe connected between the process tower and the esterification reaction kettle.

7. The low-purity BDO full recycling system of the PBT polymerization device according to claim 6, wherein: and the discharge end of the BD filter is connected with the SBD collecting tank through a sixth transmission and distribution pipe.

8. The low-purity BDO full recycling system of the PBT polymerization device according to claim 7, which is characterized in that: and the discharge end of the SBD collecting tank is connected with the slurry preparation tank through a seventh transmission and distribution pipe.

9. The low-purity BDO full recycling system of the PBT polymerization device according to claim 8, wherein: and a stirrer is arranged in the slurry preparation tank and is driven by a motor.

10. The low-purity BDO full recycling system of the PBT polymerization device according to any one of the claims 1 to 9, which is characterized in that: and a human-shaped inspection hole is formed below the esterification reaction kettle.