Vacuum collecting device for polytetrahydrofuran production

Abstract

The utility model provides a vacuum collecting device for polytetrahydrofuran production, and relates to the technical field of polytetrahydrofuran production devices. The vacuum collection device for polytetrahydrofuran production comprises an alcoholysis system, a first neutralization system and a second neutralization system which are connected with a discharge tank, a first vacuum assembly is arranged between the alcoholysis system and the discharge tank, and a second vacuum assembly is arranged between the first neutralization system and the discharge tank. A vacuum assembly III is arranged between the neutralization system II and the discharge tank, and the discharge tank is also connected with a nitrogen pipeline. The device can realize continuous discharge of materials without intermittent discharge, reduces workload, saves time and labor, does not affect vacuum of each system, and ensures normal work of each system.

Description

TECHNICAL FIELD

[0001] The utility model relates to polytetrahydrofuran production device technical field, specifically, relate to a kind of polytetrahydrofuran production vacuum collection device. BACKGROUND

[0002] The existing polytetrahydrofuran device in domestic mainly is that refined tetrahydrofuran (THF), acetic acid (HAC) and acetic anhydride (ACAN) occur ring-opening polymerization under the action of catalyst (perfluorosulfonic acid resin), generate intermediate polytetramethylene ether diacetate (PTMEA), polytetramethylene ether diacetate (PTMEA) and methanol generate polytetrahydrofuran (PTMEG) under the catalysis of catalyst sodium methoxide, and the catalyst sodium methoxide in product is added magnesium sulfate to neutralize and remove, in order to generate high-purity polytetrahydrofuran (PTMEG), methanol and water in polytetrahydrofuran (PTMEG) in generation process need to be removed, and this process must be completely removed using high vacuum.

[0003] Methanol is entrained in vacuum, and product and water enter vacuum pump, causing vacuum pump to be blocked by liquid and even to be stopped, and usually, vapor-liquid separation tank is intermittently arranged at the inlet of pump in design to separate gas phase of system, liquid is discharged by manually opening bottom valve of separation tank, and is discharged to independent maintenance discharge tank through discharge pipeline, in order to prevent system from being pressurized, and discharge can be discharged in sections. However, because of uncertainty of manual control, liquid is not always discharged cleanly in separation tank at the inlet of vacuum pump, causing trace liquid to enter vacuum pump, and affecting stable operation of vacuum pump. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of polytetrahydrofuran production vacuum collection device, which can solve the above technical problems.

[0005] The utility model is implemented by the following technical solutions:

[0006] A kind of polytetrahydrofuran production vacuum collection device, including the alcoholysis system, neutralization system one and neutralization system two respectively with discharge tank connection, vacuum component one is arranged between the alcoholysis system and the discharge tank, vacuum component two is arranged between the neutralization system one and the discharge tank, vacuum component three is arranged between the neutralization system two and the discharge tank, nitrogen gas pipeline is also connected on the discharge tank.

[0007] Further, the vacuum component one includes vacuum pump one and separator one connected, the inlet of the separator one is communicated with the outlet of the alcoholysis system, and the outlet of the separator one is communicated with the inlet of the discharge tank.

[0008] Further, U type liquid seal one is arranged on the connecting pipeline between the separator one and the discharge tank.

[0009] Further, the vacuum assembly two comprises a vacuum pump two and a separator two connected with each other, the inlet of the separator two is communicated with the outlet of the neutralization system one, and the outlet of the separator two is communicated with the inlet of the discharge tank.

[0010] Further, the vacuum assembly three comprises a vacuum pump three, the vacuum pump three is a two-stage vacuum pump, the vacuum pump three is connected with a condenser one and a condenser two, the inlet of the condenser one is communicated with the outlet of the neutralization system two, and the outlets of the condenser one and the condenser two are respectively communicated with the inlet of the discharge tank.

[0011] Further, a U-shaped liquid seal two is arranged on the connecting pipeline between the condenser one and the discharge tank.

[0012] Further, a turnover plate liquid level meter and a vacuum pressure gauge are arranged on the discharge tank, and a guide pipe line is arranged at the bottom of the discharge tank.

[0013] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0014] The utility model discloses a vacuum assembly one, vacuum assembly two, vacuum assembly three respectively discharge the material in alcoholysis system, neutralization system one and neutralization system two to the discharge tank, can realize the continuous discharge of the material of each system, need not intermittent discharge, reduces the workload, saves time and labor. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment, and should understand, the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0016] Figure 1 The structure schematic view of the vacuum collection device for polytetrahydrofuran production provided by the embodiment 1 of the utility model.

[0017] Icon: 1 - vent tank, 2 - alcoholysis system, 3 - neutralization system one, 4 - neutralization system two, 5 - nitrogen line, 6 - vacuum pump one, 7 - separator one, 8 - U-type liquid seal one, 9 - vacuum pump two, 10 - separator two, 11 - vacuum pump three, 12 - condenser two, 13 - condenser one, 14 - U-type liquid seal two, 15 - flap liquid level meter, 16 - vacuum pressure gauge, 17 - guide tube line. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0020] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] In the description of the present application, it should also be noted that unless otherwise explicitly specified and limited, if the terms "set", "mount", "connected", "connected" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment provides a vacuum collection device for the production of polytetrahydrofuran, including an alcoholysis system 2, a neutralization system 1 3, and a neutralization system 2 4, which are respectively connected to an emission tank 1. A vacuum component 1 is provided between the alcoholysis system 2 and the emission tank 1, a vacuum component 2 is provided between the neutralization system 1 3 and the emission tank 1, and a vacuum component 3 is provided between the neutralization system 2 4 and the emission tank 1. A nitrogen pipeline 5 is also connected to the emission tank 1.

[0025] Materials from alcoholysis system 2, neutralization system 1 (3), and neutralization system 2 (4) are discharged into discharge tank 1 via vacuum components 1, 2, and 3, respectively. This allows for continuous discharge of materials from each system without interruption, reducing workload and saving time and effort. Furthermore, each vacuum component operates independently, preventing interference with the vacuum of other systems and resolving existing issues of vacuum breaking and pressure cross-contamination during discharge. After discharge tank 2 is full, each system can be isolated according to production needs. Nitrogen is then introduced through nitrogen line 5 to force the material out of discharge tank 1. After discharge, each system can be reopened for continued vacuuming. The operation is simple and convenient.

[0026] In this embodiment, the vacuum assembly includes a vacuum pump 6 and a separator 7 connected together. The inlet of the separator 7 is connected to the outlet of the alcoholysis system 2, and the outlet of the separator 7 is connected to the inlet of the discharge tank 1.

[0027] In this embodiment, a U-shaped liquid seal 8 is provided on the connecting pipeline between the separator 7 and the discharge tank 1. The U-shaped liquid seal 8 can prevent fluctuations in the alcoholysis system 2, prevent pressure cross-contamination, and avoid affecting the operation of the neutralization system 3 and the neutralization system 4.

[0028] In this embodiment, the vacuum assembly 2 includes a vacuum pump 2 9 and a separator 2 10 connected to each other. The inlet of the separator 2 10 is connected to the outlet of the neutralization system 1 3, and the outlet of the separator 2 10 is connected to the inlet of the discharge tank 1.

[0029] In the embodiment of the present embodiment, the vacuum assembly three includes a vacuum pump three 11, the vacuum pump three 11 is a two-stage vacuum pump, the vacuum pump three 11 is connected with a condenser one 13 and a condenser two 12, the inlet of the condenser one 13 is communicated with the outlet of the neutralization system two 4, the outlets of the condenser one 13 and the condenser two 12 are respectively communicated with the inlet of the discharge tank 1. The two-stage vacuum pump can be two-stage vacuumized, so that higher vacuum degree and higher vacuumizing rate are realized. The vacuum pump three 11 is further connected with the vacuum pump two 9 through a pipeline, so that the vacuum pump two 9 and the vacuum pump three 11 can be simultaneously used to vacuumize the neutralization system two 4.

[0030] In the embodiment of the present embodiment, a U-shaped liquid seal two 14 is arranged on the connecting pipeline of the condenser one 13 and the discharge tank 1. The U-shaped liquid seal two 14 can avoid the fluctuation of the neutralization system two 4, prevent the pressure from intercommunicating, and avoid affecting the work of other systems when the vacuum is high.

[0031] In the embodiment of the present embodiment, a flip plate liquid level meter 15 and a vacuum pressure gauge 16 are arranged on the discharge tank 1, and a guide pipeline 17 is arranged at the bottom of the discharge tank 1. The flip plate liquid level meter 15 and the vacuum pressure gauge 16 can facilitate the staff to observe the material condition of the discharge tank 1, and the guide pipeline 17 facilitates the discharge of the material in the discharge tank 1.

[0032] The working principle of a vacuum collecting device for polytetrahydrofuran production is as follows:

[0033] In the production process, the whole device is in a vacuum state, the vacuum pump one 6 pumps out the material of the alcoholysis system 2, separates the material through the separator one 7, and then discharges the material into the discharge tank 1, the vacuum pump two 9 pumps out the material of the neutralization system one 3, separates the material through the separator two 10, and then discharges the material into the discharge tank 1, and the vacuum pump three 11 pumps out the material of the neutralization system two 4, condenses the material through the condenser two 12 and the condenser one 13, and then discharges the material into the discharge tank 1.

[0034] When the material in the discharge tank 1 is about to be filled, the alcoholysis system 2, the neutralization system one 3 and the neutralization system two 4 are respectively isolated from the discharge tank 1, nitrogen is introduced into the discharge tank 1 from the nitrogen pipeline 5, the material in the discharge tank 1 is discharged from the guide pipeline 17, after the discharge is completed, the nitrogen pipeline 5 and the guide pipeline 17 are closed, and the systems are opened to continue vacuumizing.

[0035] The above is only a preferred embodiment of the present utility model, and is not used for limiting the present utility model. For those skilled in the art, the present utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A vacuum collection device for polytetrahydrofuran production, characterized by: The alcoholysis system, the neutralization system one and the neutralization system two are connected with the discharge tank respectively, a vacuum assembly one is arranged between the alcoholysis system and the discharge tank, a vacuum assembly two is arranged between the neutralization system one and the discharge tank, a vacuum assembly three is arranged between the neutralization system two and the discharge tank, and a nitrogen pipeline is further connected with the discharge tank.

2. The vacuum collection device for polytetrahydrofuran production according to claim 1, characterized by The vacuum assembly one comprises a vacuum pump one and a separator one connected with each other, the inlet of the separator one is communicated with the outlet of the alcoholysis system, and the outlet of the separator one is communicated with the inlet of the discharge tank.

3. The vacuum collection device for polytetrahydrofuran production according to claim 2, characterized by A U-shaped liquid seal one is arranged on the connecting pipeline between the separator one and the discharge tank.

4. The vacuum collection device for polytetrahydrofuran production according to claim 1, characterized by The vacuum assembly two comprises a vacuum pump two and a separator two connected with each other, the inlet of the separator two is communicated with the outlet of the neutralization system one, and the outlet of the separator two is communicated with the inlet of the discharge tank.

5. The vacuum collection device for polytetrahydrofuran production according to claim 1, characterized by The vacuum assembly three comprises a vacuum pump three, the vacuum pump three is a two-stage vacuum pump, the vacuum pump three is connected with a condenser one and a condenser two, the inlet of the condenser one is communicated with the outlet of the neutralization system two, and the outlets of the condenser one and the condenser two are respectively communicated with the inlet of the discharge tank.

6. The vacuum collection device for polytetrahydrofuran production according to claim 5, characterized by A U-shaped liquid seal two is arranged on the connecting pipeline between the condenser one and the discharge tank.

7. The vacuum collection device for polytetrahydrofuran production according to claim 1, characterized by A turnover liquid level gauge and a vacuum pressure gauge are arranged on the discharge tank, and a guide pipeline is arranged at the bottom of the discharge tank.

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