Condensate water recycling device for pyridine production
By designing a condensate water recycling device during the pyridine production process and using condensate water to exchange heat for raw materials, the problem of formaldehyde polymer blockage is solved, and energy saving and consumption reduction and stable operation of the equipment is achieved.
Patent Information
- Application Number
- CN202421207263.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-30
AI Technical Summary
During the pyridine production process, low-temperature formaldehyde solution is prone to form formaldehyde polymers when vaporized in the aldehyde vaporizer, resulting in blockage of the equipment pipeline and affecting the long-term operation of the device.
A condensate recycling device for pyridine production was designed, and the raw material mixture was exchanged through primary and secondary condensate heat exchangers, and the gaseous raw materials were further heated to reduce the steam usage and steam purging frequency.
By recycling and utilizing condensate, the steam usage of the aldehyde vaporizer and aldehyde preheater is reduced, the risk of equipment blockage is reduced, and energy saving and consumption reduction are achieved and the equipment is long-term and stable operation is achieved.
Smart Images
Figure CN222670795U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pyridine production, in particular to a condensed water recycling device for pyridine production. Background Art
[0002] In the pyridine production industry, 55% formaldehyde solution and acetaldehyde solution need to be vaporized in an aldehyde vaporizer, and the aldehyde preheater heats the gaseous raw materials to enter the reactor for mixing and reaction with liquid ammonia. A large amount of steam is required to vaporize and heat the raw materials during the raw material feeding process. In addition, due to the structure of the aldehyde vaporizer and the physical and chemical properties of high-concentration formaldehyde, the 55% low-temperature formaldehyde solution enters the aldehyde vaporizer for vaporization, which easily forms formaldehyde polymers that block the aldehyde vaporizer equipment pipeline, affecting the long-term operation of the device. Utility Model Content
[0003] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide a condensed water recovery and utilization device for pyridine production, which can solve the above technical problems.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] A condensed water recycling device for pyridine production comprises an aldehyde vaporizer, an aldehyde preheater and a reactor which are connected in sequence, a primary condensed water heat exchanger is arranged at the front end of the aldehyde vaporizer, a secondary condensed water heat exchanger is arranged between the aldehyde preheater and the aldehyde vaporizer, the primary condensed water heat exchanger and the secondary condensed water heat exchanger are both connected to a condensed water collecting tank, a condensed water delivery pipeline is connected to one side of the condensed water collecting tank, and a delivery pump is arranged on the condensed water delivery pipeline.
[0006] Preferably, the primary condensate heat exchanger is provided with two inlets and two outlets, wherein one inlet is connected to the condensate, the other inlet is connected to the raw material mixed liquid, one outlet is connected to the aldehyde vaporizer, and the other outlet is connected to the condensate collecting tank.
[0007] Preferably, the secondary condensate heat exchanger is provided with two inlets and two outlets, wherein one inlet is connected to the condensate, the other inlet is connected to the aldehyde vaporizer, one outlet is connected to the aldehyde preheater, and the other outlet is connected to the condensate collecting tank.
[0008] Preferably, the number of the aldehyde vaporizers is five, and the five aldehyde vaporizers are arranged in parallel.
[0009] Preferably, the number of the aldehyde preheaters is two, and the two aldehyde preheaters are arranged in parallel.
[0010] Compared with the prior art, the utility model has the following beneficial effects: the utility model recycles the 140°C condensed water produced by the distillation process in the pyridine production process to exchange heat with the raw material mixture through a condensed water heat exchanger, and then further heats the gaseous raw material at the outlet of the aldehyde vaporizer to increase the temperature of the gaseous raw material, which can reduce the steam usage of the aldehyde vaporizer and the aldehyde preheater, and reduce the frequency of steam purge of the aldehyde vaporizer, thereby achieving the purpose of energy saving and consumption reduction and long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.
[0012] Figure 1 It is a flow chart of the utility model.
[0013] Description of reference numerals:
[0014] 1-aldehyde vaporizer, 2-aldehyde preheater, 3-reactor, 4-primary condensate heat exchanger, 5-secondary condensate heat exchanger, 6-condensate collecting tank, 7-condensate delivery pipeline, 8-delivery pump. DETAILED DESCRIPTION
[0015] The following is a detailed description of the invention of the utility model by way of examples in conjunction with the accompanying drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Example
[0016] like Figure 1 As shown, the utility model discloses a condensate recycling device for pyridine production, comprising an aldehyde vaporizer 1, an aldehyde preheater 2 and a reactor 3 connected in sequence, wherein the front end of the aldehyde vaporizer 1 is provided with a primary condensate heat exchanger 4, and the primary condensate heat exchanger 4 is provided with two inlets and two outlets, wherein one inlet is connected to condensate, the other inlet is connected to a mixed liquid of formaldehyde and acetaldehyde raw materials, one outlet is connected to the aldehyde vaporizer 1, and the other outlet is connected to a condensate collecting tank 6; a secondary condensate heat exchanger 5 is provided between the aldehyde preheater 2 and the aldehyde vaporizer 1, and the secondary condensate heat exchanger 5 is provided with two inlets and two outlets, wherein one inlet is connected to condensate, the other inlet is connected to the aldehyde vaporizer 1, one outlet is connected to the aldehyde preheater 2, and the other outlet is connected to the condensate collecting tank 6; the primary condensate heat exchanger 4 and the secondary condensate heat exchanger 5 are both connected to the condensate collecting tank 6, one side of the condensate collecting tank 6 is connected to a condensate delivery pipeline 7, and a delivery pump 8 is provided on the condensate delivery pipeline 7.
[0017] Furthermore, in this embodiment, the number of the aldehyde vaporizers 1 is five, and the five aldehyde vaporizers 1 are arranged in parallel. By arranging multiple aldehyde vaporizers 1, it is beneficial to increase the heat exchange area and improve the production efficiency.
[0018] Furthermore, in the present embodiment, the number of the aldehyde preheaters 2 is two, and the two aldehyde preheaters 2 are arranged in parallel. Since the heating temperature in the aldehyde preheater 2 is relatively high, formaldehyde and acetaldehyde will form coke when reaching 115°C, clogging the pipeline, resulting in poor heat exchange efficiency and requiring regular cleaning. By setting up two aldehyde preheaters 2, one as a backup and the other as a standby, when one of the aldehyde preheaters 2 is cleaned, the other one can be activated without affecting production.
[0019] Working principle: The formaldehyde and acetaldehyde raw materials at 60℃ first enter the primary condensate heat exchanger 4 for heat exchange, and the formaldehyde and acetaldehyde are heated to about 102℃ and enter the aldehyde vaporizer 1 for vaporization, and then pass through the secondary condensate heat exchanger 5 to further increase the raw material temperature, and finally pass through the aldehyde preheater 2 to increase the formaldehyde and acetaldehyde gas to about 120℃ and send it to the reactor 3, where it is mixed with liquid ammonia to react and generate a pyridine mixture, which then enters the subsequent process for distillation separation to obtain a pyridine product.
[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the technical solution and application concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A condensed water recycling device for pyridine production, characterized in that: The invention comprises an aldehyde vaporizer (1), an aldehyde preheater (2) and a reactor (3) which are connected in sequence. A first-stage condensed water heat exchanger (4) is provided at the front end of the aldehyde vaporizer (1). A second-stage condensed water heat exchanger (5) is provided between the aldehyde preheater (2) and the aldehyde vaporizer (1). Both the first-stage condensed water heat exchanger (4) and the second-stage condensed water heat exchanger (5) are connected to a condensed water collecting tank (6). A condensed water delivery pipeline (7) is connected to one side of the condensed water collecting tank (6). A delivery pump (8) is provided on the condensed water delivery pipeline (7).
2. A condensed water recycling device for pyridine production as claimed in claim 1, characterized in that: The first-stage condensate heat exchanger (4) is provided with two inlets and two outlets, wherein one inlet is connected to the condensate, the other inlet is connected to the raw material mixed liquid, one outlet is connected to the aldehyde vaporizer (1), and the other outlet is connected to the condensate collection tank (6).
3. A condensed water recycling device for pyridine production as claimed in claim 1, characterized in that: The secondary condensate heat exchanger (5) is provided with two inlets and two outlets, wherein one inlet is connected to the condensate, the other inlet is connected to the aldehyde vaporizer (1), one outlet is connected to the aldehyde preheater (2), and the other outlet is connected to the condensate collection tank (6).
4. A condensed water recycling device for pyridine production as claimed in claim 1, characterized in that: The number of the aldehyde vaporizers (1) is five, and the five aldehyde vaporizers (1) are arranged in parallel.
5. A condensed water recycling device for pyridine production as claimed in claim 1, characterized in that: The number of the aldehyde preheaters (2) is two, and the two aldehyde preheaters (2) are arranged in parallel.