Paraformaldehyde depolymerization device
By designing a paraformaldehyde depolymerization device, the low-temperature depolymerization and complete dissolution of paraformaldehyde is achieved by using a tube reactor and a return tube, the problem of high energy consumption and inability to stably and continuously produce depolymerization liquid in the prior art is solved. Adapt to continuous production needs.
Patent Information
- Application Number
- CN202421163894.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-05-23
AI Technical Summary
The existing paraformaldehyde depolymerization technology has the defect of high energy consumption and the inability to stable and continuous output of depolymerization liquid, and cannot adapt to continuous production.
A paraformaldehyde depolymerization device is designed, including a paraformaldehyde feed tank, an alcohol solution feed tank, a depolymerization liquid storage tank, a tube reactor and a return tube, and passes through a heat exchange sleeve in a tube reactor and return tube to achieve low temperature depolymerization and complete dissolution of paraformaldehyde.
The paraformaldehyde depolymerization is achieved at a lower temperature, and the depolymerization liquid is produced stably and continuously, adapting to continuous production, and ensuring complete dissolution of paraformaldehyde.
Smart Images
Figure CN222446539U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical production, and in particular relates to a paraformaldehyde depolymerization device. Background Art
[0002] Formaldehyde is an important basic organic chemical raw material, mainly used in synthetic plastics, synthetic resins, chemical fibers, dyes, coatings, medicines, pesticides and other industries. However, due to its low boiling point, active properties, poor storage stability, high packaging requirements, high transportation costs, and inconvenient use, formaldehyde is not convenient for long-distance transportation and convenient use from a safety and economic perspective, and is usually further prepared into solid polyformaldehyde.
[0003] As paraformaldehyde is increasingly widely used, its depolymerization becomes particularly important. Existing methods for depolymerizing paraformaldehyde are mostly high-temperature intermittent reactions, which consume a lot of energy and cannot stably and continuously produce depolymerization liquid, and are not suitable for continuous production. Utility Model Content
[0004] In order to solve the above technical problems, the utility model provides a paraformaldehyde depolymerization device, including a paraformaldehyde feed tank, an alcohol solution feed tank, a depolymerization liquid storage tank, a tubular reactor and a reflux pipe, wherein the tubular reactor comprises a heat exchange sleeve, a feed port and a discharge port, the feed port is provided with a four-way interface, the discharge port is provided with a three-way interface, the heat exchange sleeve is provided with a sleeve inlet and a sleeve outlet; the paraformaldehyde feed tank is provided with a first outlet and a first feed pipe, the first outlet is connected to the four-way interface through the first feed pipe, and the four-way interface is connected to the four-way interface. The first feed pipe is provided with a first feed pump; the alcohol solution feed tank is provided with a second outlet and a second feed pipe, the second outlet is connected to the four-way interface through the second feed pipe, and the second feed pipe is provided with a second feed pump; the reflux pipe is connected to the three-way interface and the four-way interface, and the reflux pipe is provided with a reflux pump; the depolymerization liquid storage tank is provided with a third outlet and a third feed pipe, the third feed pipe is connected to the three-way interface, and the third feed pipe is provided with a valve.
[0005] Preferably, the first feed pump is a screw feed pump. Since polymethanol is small solid particles, a screw feed pump is more convenient for transporting solid particles.
[0006] Preferably, the medium in the heat exchange sleeve is hot water or heat transfer oil.
[0007] The utility model also includes other devices or components that can enable the paraformaldehyde depolymerization device to be used normally, which are all conventional technical means in the art. In addition, the pipelines, pumps, feed tanks, and storage tank devices not limited in the utility model all adopt conventional technical means in the art.
[0008] The working principle of the utility model is that, under the conveyance of the first feed pump and the second feed pump, the paraformaldehyde and the alcohol solution enter the feed port of the tubular reactor through the first feed pipe and the second feed pipe, the materials flow and mix in the tubular reactor, and are heated under the action of the heat exchange sleeve, so that the paraformaldehyde is more easily dissolved in the alcohol solution, and the completely reacted materials flow out from the discharge port of the tubular reactor and enter the depolymerization liquid storage tank for subsequent processes; when there are still undissolved paraformaldehyde particles in the outflowing formaldehyde alcohol solution, the reflux pump can be turned on to make the materials flow back to the feed port of the tubular reactor through the reflux pipe, re-enter the tubular reactor for reaction again, until the paraformaldehyde is completely dissolved.
[0009] The utility model has the beneficial effects of enabling the depolymerization of paraformaldehyde to proceed at a relatively low temperature; the depolymerization reactor adopts a tubular reactor, which can stably and continuously produce depolymerization liquid and is suitable for continuous production; the reflux pipe can increase the back mixing of materials and ensure that the paraformaldehyde is completely dissolved. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION
[0012] The present invention is described in detail below in conjunction with the drawings and specific embodiments in the embodiments of the present invention. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., should be included in the protection scope of the present invention.
[0013] Example
[0014] like Figure 1As shown, the utility model provides a paraformaldehyde depolymerization device, including a paraformaldehyde feed tank 1, an alcohol solution feed tank 2, a depolymerization liquid storage tank 3, a tubular reactor 4 and a reflux pipe 5, wherein the tubular reactor 4 comprises a heat exchange sleeve 6, a feed port 7 and a discharge port 8, wherein the feed port 7 is provided with a four-way interface 9, and the discharge port 8 is provided with a three-way interface 10, and the heat exchange sleeve 6 is provided with a sleeve inlet 11 and a sleeve outlet 12; the paraformaldehyde feed tank 1 is provided with a first outlet 13 and a first feed pipe 14, wherein the first outlet 13 is connected to the four-way interface 9 through the first feed pipe 14, and the first outlet 13 is connected to the four-way interface 9 through the first feed pipe 14. A first feed pump 15 is provided on a feed pipe 14; the alcohol solution feed tank 2 is provided with a second outlet 16 and a second feed pipe 17, the second outlet 16 is connected to the four-way interface 9 through the second feed pipe 17, and the second feed pump 18 is provided on the second feed pipe 17; the reflux pipe 5 is connected to the three-way interface 10 and the four-way interface 9, and the reflux pipe 5 is provided with a reflux pump 19; the depolymerization liquid storage tank 3 is provided with a third outlet 20 and a third feed pipe 21, the third feed pipe 21 is connected to the three-way interface 10, and the third feed pipe 21 is provided with a valve 22.
[0015] Specifically, the first feed pump 15 is a screw feed pump. Since the polymethanol is a small solid particle, the screw feed pump is more convenient for transporting the solid particles.
[0016] More specifically, the medium in the heat exchange sleeve 6 is heat transfer oil.
[0017] The working principle of the utility model is that, under the conveyance of the first feed pump 15 and the second feed pump 18, the paraformaldehyde and alcohol solution enter the feed port 7 of the tubular reactor 4 through the first feed pipe 14 and the second feed pipe 17, the materials flow and mix in the tubular reactor 4, and are heated under the action of the heat exchange sleeve 6, so that the paraformaldehyde is more easily dissolved in the alcohol solution, and the completely reacted materials flow out from the discharge port 8 of the tubular reactor 4 and enter the depolymerization liquid storage tank 3 for subsequent processes; when there are still undissolved paraformaldehyde particles in the outflowing formaldehyde alcohol solution, the reflux pump 19 can be turned on to make the materials flow back to the feed port 7 of the tubular reactor 4 through the reflux pipe 5, and re-enter the tubular reactor 4 to react again until the paraformaldehyde is completely dissolved.
[0018] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.
Claims
1. A paraformaldehyde depolymerization device, comprising a paraformaldehyde feed tank, an alcohol solution feed tank, a depolymerization liquid storage tank, a tubular reactor and a reflux pipe, characterized in that: The tubular reactor comprises a heat exchange sleeve, a feed port and a discharge port, the feed port is provided with a four-way interface, the discharge port is provided with a three-way interface, and the heat exchange sleeve is provided with a sleeve inlet and a sleeve outlet; The paraformaldehyde feed tank is provided with a first outlet and a first feed pipe, the first outlet is connected to the four-way interface through the first feed pipe, and the first feed pipe is provided with a first feed pump; The alcohol solution feed tank is provided with a second outlet and a second feed pipe, the second outlet is connected to the four-way interface through the second feed pipe, and the second feed pipe is provided with a second feed pump; The reflux pipe is connected to the three-way interface and the four-way interface, and a reflux pump is provided on the reflux pipe; The depolymerization liquid storage tank is provided with a third outlet and a third feed pipe, the third feed pipe is connected to the three-way interface, and a valve is provided on the third feed pipe.
2. A paraformaldehyde depolymerization device according to claim 1, characterized in that: The first feed pump is a screw feed pump.
3. A paraformaldehyde depolymerization device according to claim 1, characterized in that: The medium in the heat exchange sleeve is hot water or heat transfer oil.