THF (tetrahydrofuran) multi-stage rectification device for regenerated PBT (polybutylene terephthalate) production

Abstract

The utility model relates to the technical field of fine chemical product rectification, and particularly discloses a THF (tetrahydrofuran) multistage rectification device for regenerated PBT (polybutylene terephthalate) production, which comprises a bottom plate and a rectification mechanism, the rectification mechanism comprises a dehydrating tower, a pressurizing tower, a refining tower, a mounting frame, a first conveying pipe, a return pipe, a second conveying pipe, a discharge pipe, a waste discharge pipe, a blow-off pipe, a waste discharge assembly, a blow-off assembly and a feeding assembly, one ends of the first conveying pipe and the return pipe are respectively and fixedly connected with the dehydrating tower, the other ends of the first conveying pipe and the return pipe are respectively and fixedly connected with the pressurizing tower, one end of the second conveying pipe is fixedly connected with the pressurizing tower, the other end of the second conveying pipe is connected with the refining tower, the waste discharge pipe and the blow-off pipe are both connected with the dehydrating tower, and the discharge pipe is connected with the refining tower. The THF purification device disclosed by the utility model has the advantages that the structure is simple, the operation is convenient and fast, and the THF purification efficiency can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fine chemical product rectification technical field especially relates to a THF multistage rectification device of regenerative PBT production. BACKGROUND

[0002] PBT (polybutylene terephthalate) as an important thermoplastic polyester, because its excellent mechanical properties, electrical properties, heat resistance and processing performance, is widely used in wire and cable, automobile parts, electronic appliances, mechanical instruments and many other fields, is one of the five engineering plastics.

[0003] In the production process of PBT, the wastewater containing THF (tetrahydrofuran) is produced, THF is a colorless liquid with special smell, has excellent solubility and chemical stability, is widely used as organic solvent, reaction medium and synthetic raw material, in order to reduce environmental pollution and improve the utilization of resources, need to use rectification device to the THF wastewater produced in the production process of PBT rectification purification.

[0004] But the existing THF multistage rectification device, complex structure, operation is troublesome, leading to low purification efficiency. UTILITY MODEL CONTENT

[0005] The utility model discloses a THF multistage rectification device of regenerative PBT production, and aims at solving the technical problems, such as the complex structure of the existing THF multistage rectification device, operation is troublesome, leading to low purification efficiency.

[0006] To achieve the above object, a THF multistage rectification device of regenerative PBT production is adopted in the utility model, including bottom plate and rectification mechanism, the rectification mechanism includes dehydration tower, pressurized tower, refining tower, mounting bracket, first conveying pipe, reflux pipe, second conveying pipe, discharge pipe, waste pipe, blowdown pipe, waste removal assembly, blowdown assembly and feed assembly, the mounting bracket is arranged on the upper surface of the bottom plate, the dehydration tower, the pressurized tower and the refining tower are all fixedly connected with the mounting bracket, one end of the first conveying pipe and the reflux pipe is fixedly connected with the dehydration tower respectively, the other end of the first conveying pipe and the reflux pipe is fixedly connected with the pressurized tower respectively, one end of the second conveying pipe is fixedly connected with the pressurized tower, the other end of the second conveying pipe is connected with the refining tower, the waste pipe and the blowdown pipe are connected with the dehydration tower, the discharge pipe is connected with the refining tower, the waste removal assembly is connected with the pressurized tower, the blowdown assembly is connected with the refining tower, the feed assembly is arranged on the upper surface of the bottom plate.

[0007] The feeding assembly comprises a receiving tank, a plurality of supporting rods, a water inlet pipe, a conveying member and a filter, one end of each of the supporting rods is fixedly connected with the bottom plate, the other end of each of the supporting rods is fixedly connected with the receiving tank, the water inlet pipe is fixedly connected with the receiving tank, the filter is arranged in the receiving tank, and the conveying member is fixedly connected with the receiving tank.

[0008] The filter comprises a limiting ring and a filter frame, the limiting ring is fixedly connected with the receiving tank and located in the receiving tank, and the filter frame is arranged in the limiting ring.

[0009] The conveying member comprises a water supply pipe, a first water pump and a preheater, one end of the water supply pipe is fixedly connected with the receiving tank, the other end of the water supply pipe is connected with the dehydration tower, and the first water pump and the preheater are arranged in the middle part of the water supply pipe.

[0010] The waste discharge assembly comprises a first connecting pipe and a second water pump, one end of the first connecting pipe is fixedly connected with the pressurizing tower, the other end of the first connecting pipe is fixedly connected with the waste discharge pipe, and the second water pump is arranged in the middle part of the first connecting pipe.

[0011] The waste discharge assembly comprises a first connecting pipe and a second water pump, one end of the first connecting pipe is fixedly connected with the pressurizing tower, the other end of the first connecting pipe is fixedly connected with the waste discharge pipe, and the second water pump is arranged in the middle part of the first connecting pipe.

[0012] The utility model discloses a THF multistage rectification device of regenerative PBT production, first conveying pipe with the one end of reflux pipe is fixedly connected with dehydrating tower respectively, the other end of first conveying pipe with reflux pipe is fixedly connected with pressurized tower respectively, one end of second conveying pipe is fixedly connected with pressurized tower, the other end of second conveying pipe is connected with refining tower, when using specifically, THF waste water produced in PBT production is stored in the feed assembly, and THF waste water is sent to the dehydrating tower after preheating through the feed assembly, and THF waste water is condensed in the dehydrating tower, and a part is as the reflux of dehydrating tower, and another part enters the pressurized tower from the first conveying pipe and separates, and THF waste water enters the pressurized tower and is handled, and a part is refluxed to the dehydrating tower in the reflux pipe and separates, and another part is sent to the refining tower in the second conveying pipe and separates, and THF separated out from the refining tower is discharged from the discharge pipe, and butanol and other residual liquid in the dehydrating tower are discharged from the waste pipe and are incinerated, and waste water in the dehydrating tower is discharged from the blowdown pipe and is treated, and the method can effectively solve the problems of the existing THF multistage rectification device, complex structure, complicated operation and low purification efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, below will be to the drawings needed to be used in the embodiment or prior art description simple introduction, obviously, below description's drawing only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0014] Figure 1 It is the structural schematic diagram of the utility model.

[0015] Figure 2 It is the perspective view of the utility model.

[0016] Figure 3 It is the front view of the utility model.

[0017] Figure 4 It is the partial structure schematic diagram of the utility model.

[0018] 101-bottom plate, 102-dehydration tower, 103-pressurized tower, 104-refining tower, 105-mounting frame, 106-first conveying pipe, 107-reflux pipe, 108-second conveying pipe, 109-discharge pipe, 110-waste discharge pipe, 111-waste pipe, 112-receiving tank, 113-supporting rod, 114-water inlet pipe, 115-limiting ring, 116-filtering frame, 117-water supply pipe, 118-first water pump, 119-preheater, 120-first connecting pipe, 121-second water pump, 122-second connecting pipe, 123-third water pump. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, the embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0020] Please refer to Figures 1-4 , wherein Figure 1 is a structural schematic diagram of the present application, Figure 2 is a perspective view of the present application, Figure 3 is a front view of the present application, Figure 4 is a partial structural schematic diagram of the present application.

[0021] The present application provides a THF multistage rectification device for regenerating PBT production, comprising a bottom plate 101 and a rectification mechanism, the rectification mechanism comprising a dehydration tower 102, a pressurized tower 103, a refining tower 104, a mounting frame 105, a first conveying pipe 106, a reflux pipe 107, a second conveying pipe 108, a discharge pipe 109, a waste discharge pipe 110, a waste pipe 111, a waste discharge assembly, a waste pipe assembly and a feeding assembly, the feeding assembly comprising a receiving tank 112, a plurality of supporting rods 113, a water inlet pipe 114, a conveying part and a filtering part, the filtering part comprising a limiting ring 115 and a filtering frame 116, the conveying part comprising a water supply pipe 117, a first water pump 118 and a preheater 119, the waste discharge assembly comprising a first connecting pipe 120 and a second water pump 121, the waste pipe assembly comprising a second connecting pipe 122 and a third water pump 123, the foregoing scheme solves the problems of the existing THF multistage rectification device, complex structure, cumbersome operation, and low purification efficiency.

[0022] For this specific embodiment, the mounting frame 105 is arranged on the upper surface of the bottom plate 101, the dehydration tower 102, the pressurizing tower 103 and the refining tower 104 are fixedly connected with the mounting frame 105, one end of the first conveying pipe 106 and the reflux pipe 107 is respectively fixedly connected with the dehydration tower 102, the other end of the first conveying pipe 106 and the reflux pipe 107 is respectively fixedly connected with the pressurizing tower 103, one end of the second conveying pipe 108 is fixedly connected with the pressurizing tower 103, the other end of the second conveying pipe 108 is connected with the refining tower 104, the waste discharge pipe 110 and the pollution discharge pipe 111 are both connected with the dehydration tower 102, the discharge pipe 109 is connected with the refining tower 104, the waste discharge assembly is connected with the pressurizing tower 103, the pollution discharge assembly is connected with the refining tower 104, the feeding assembly is arranged on the upper surface of the bottom plate 101, in specific use, THF wastewater generated in PBT production is stored in the feeding assembly, THF wastewater is preheated by the feeding assembly and then conveyed to the dehydration tower 102, THF wastewater is condensed in the dehydration tower 102, part of which is refluxed as reflux of the dehydration tower 102, and the other part enters the pressurizing tower 103 from the first conveying pipe 106 for separation, THF wastewater entering the pressurizing tower 103 is treated, part of which is refluxed into the dehydration tower 102 through the reflux pipe 107 for separation, and the other part is conveyed to the refining tower 104 through the second conveying pipe 108 for separation, THF separated by the refining tower 104 is discharged from the discharge pipe 109, butanol and other residual liquid in the dehydration tower 102 is discharged from the waste discharge pipe 110 for incineration treatment, and wastewater in the dehydration tower 102 is discharged through the pollution discharge pipe 111 for sewage treatment.

[0023] Among them, one end of the plurality of support rods 113 is fixedly connected with the bottom plate 101, the other end of the plurality of support rods 113 is fixedly connected with the receiving tank 112, the water inlet pipe 114 is fixedly connected with the receiving tank 112, the filter is arranged inside the receiving tank 112, and the conveying part is fixedly connected with the receiving tank 112, in specific use, THF wastewater flows into the receiving tank 112 through the water inlet pipe 114 for storage, and impurities in THF wastewater can be filtered through the filter.

[0024] Secondly, the limiting ring 115 is fixedly connected with the receiving tank 112 and located inside the receiving tank 112, and the filter frame 116 is arranged inside the limiting ring 115, in specific use, the filter frame 116 is installed in the receiving tank 112 through the limiting ring 115, and impurities in THF wastewater are filtered through the filter frame 116.

[0025] Meanwhile, one end of the water supply pipe 117 is fixedly connected with the receiving tank 112, and the other end of the water supply pipe 117 is connected with the dehydration tower 102, and the first water pump 118 and the preheater 119 are both arranged in the middle part of the water supply pipe 117, and in the specific use, the first water pump 118 is started to make the THF wastewater in the receiving tank 112 transported to the dehydration tower 102 through the water supply pipe 117, and the THF wastewater can be preheated through the preheater 119.

[0026] In addition, one end of the first connecting pipe 120 is fixedly connected with the pressurizing tower 103, and the other end of the first connecting pipe 120 is fixedly connected with the waste pipe 110, and the second water pump 121 is arranged in the middle part of the first connecting pipe 120, and in the specific use, the second water pump 121 is started to make the residual liquid in the pressurizing tower 103 transported to the waste pipe 110 through the first connecting pipe 120.

[0027] Secondly, one end of the second connecting pipe 122 is fixedly connected with the refining tower 104, and the other end of the second connecting pipe 122 is fixedly connected with the sewage pipe 111, and the third water pump 123 is arranged in the middle part of the second connecting pipe 122, and in the specific use, the third water pump 123 is started to make the sewage in the refining tower 104 transported to the sewage pipe 111 through the second connecting pipe 122.

[0028] The THF multistage rectification device for producing regenerated PBT is used in the embodiment, and when used, the THF wastewater produced in PBT production flows into the receiving tank 112 through the water inlet pipe 114, the impurities in the THF wastewater are filtered through the filter frame 116, the first water pump 118 is started, the THF wastewater in the receiving tank 112 is transported to the dehydration tower 102 through the water supply pipe 117, the THF wastewater is preheated through the preheater 119, the THF wastewater is condensed in the dehydration tower 102, a part of the THF wastewater is used as reflux of the dehydration tower 102, and the other part of the THF wastewater enters the pressurized tower 103 from the first conveying pipe 106 to be separated, the THF wastewater entering the pressurized tower 103 is treated, a part of the THF wastewater is refluxed into the dehydration tower 102 through the reflux pipe 107 to be separated, the other part of the THF wastewater is transported to the refining tower 104 through the second conveying pipe 108 to be separated, the THF separated through the refining tower 104 is discharged from the discharge pipe 109, the butanol and other residual liquid in the dehydration tower 102 is discharged from the waste discharge pipe 110 to be incinerated, and the wastewater in the dehydration tower 102 is discharged from the blowdown pipe 111 to be treated, so that the problems of complex structure, complicated operation and low purification efficiency of the existing THF multistage rectification device can be effectively solved.

[0029] The above only discloses a preferred embodiment of the utility model, and of course cannot limit the scope of the utility model, and those skilled in the art can understand that all or part of the processes of the above embodiment can be implemented, and equivalent changes made according to the utility model claims still belong to the scope covered by the utility model.

Claims

1. A multi-stage rectification device for regenerating THF produced by PBT, comprising a base plate, characterized in that, further comprising a rectification mechanism, the rectification mechanism comprising a dehydration tower, a pressurization tower, a refining tower, a mounting frame, a first conveying pipe, a reflux pipe, a second conveying pipe, a discharge pipe, a waste discharge pipe, a sewage discharge pipe, a waste discharge assembly, a sewage discharge assembly and a feed assembly, the mounting frame is arranged on the upper surface of the base plate, the dehydration tower, the pressurization tower and the refining tower are fixedly connected with the mounting frame, one end of the first conveying pipe and the reflux pipe is fixedly connected with the dehydration tower respectively, the other end of the first conveying pipe and the reflux pipe is fixedly connected with the pressurization tower respectively, one end of the second conveying pipe is fixedly connected with the pressurization tower, the other end of the second conveying pipe is connected with the refining tower, the waste discharge pipe and the sewage discharge pipe are connected with the dehydration tower, the discharge pipe is connected with the refining tower, the waste discharge assembly is connected with the pressurization tower, the sewage discharge assembly is connected with the refining tower, and the feed assembly is arranged on the upper surface of the base plate.

2. The multi-stage rectification device for regenerating THF produced by PBT according to claim 1, characterized in that, the feed assembly comprises a receiving tank, a plurality of support rods, a water inlet pipe, a conveying piece and a filter piece, one end of the plurality of support rods is fixedly connected with the base plate respectively, the other end of the plurality of support rods is fixedly connected with the receiving tank respectively, the water inlet pipe is fixedly connected with the receiving tank, the filter piece is arranged in the interior of the receiving tank, and the conveying piece is fixedly connected with the receiving tank.

3. The multi-stage rectification device for regenerating THF produced by PBT according to claim 2, characterized in that, the filter piece comprises a limiting ring and a filter frame, the limiting ring is fixedly connected with the receiving tank and located in the interior of the receiving tank, and the filter frame is arranged in the interior of the limiting ring.

4. The multi-stage rectification device for regenerating THF produced by PBT according to claim 3, characterized in that, the conveying piece comprises a water supply pipe, a first water pump and a preheater, one end of the water supply pipe is fixedly connected with the receiving tank, the other end of the water supply pipe is connected with the dehydration tower, and the first water pump and the preheater are arranged in the middle part of the water supply pipe.

5. The multi-stage rectification device for regenerating THF produced by PBT according to claim 4, characterized in that, the waste discharge assembly comprises a first connecting pipe and a second water pump, one end of the first connecting pipe is fixedly connected with the pressurization tower, the other end of the first connecting pipe is fixedly connected with the waste discharge pipe, and the second water pump is arranged in the middle part of the first connecting pipe.

6. The multi-stage rectification device for regenerating THF produced by PBT according to claim 5, characterized in that, the sewage discharge assembly comprises a second connecting pipe and a third water pump, one end of the second connecting pipe is fixedly connected with the refining tower, the other end of the second connecting pipe is fixedly connected with the sewage discharge pipe, and the third water pump is arranged in the middle part of the second connecting pipe.

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