Epoxy propane refining and recycling device
By designing a propylene oxide refining and recycling device, using preheating lines and regulating valves and other equipment, the problems of PO loss and heat loss in the PO refining tower are solved, efficient PO recovery and heat reuse are achieved, and energy consumption and investment are reduced. , improve economic benefits.
Patent Information
- Application Number
- CN202420911261.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The existing propylene oxide purification towers have problems with high PO loss and heat loss, resulting in increased unit consumption and energy consumption, and the by-product low-pressure steam cannot be effectively processed.
A propylene oxide purification and recycling device was designed. By connecting the PO purification tower, the PO initial division tower and the PO separation tower, the preheating line and the regulating valve, the efficient recovery of PO and the reuse of heat, reducing by-products. Generation of .
It effectively reduces the PO loss content, reduces the generation of by-products and heat loss, reduces the energy consumption and investment of the device, and improves economic benefits.
Smart Images
Figure CN222266158U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of recovery devices, and in particular relates to a propylene oxide refining recovery device. Background Art
[0002] Propylene oxide (PO), although the chlorohydrin process and co-oxidation process have been widely used, there are still many shortcomings, such as the difficulty in treating the wastewater and waste residues produced by the chlorohydrin process, the large investment, and the inability to treat the by-products of the co-oxidation process. Therefore, the development of green and simple processes with less pollution and fewer by-products has become a focus of attention. The direct oxidation of propylene can solve the problems of the above processes and has many unique advantages. Therefore, it has become a hot spot for domestic and foreign companies to compete for research and development in recent years. As a new process technology, the direct epoxidation of propylene to produce propylene oxide technology (HPPO) is currently being widely promoted because of its simple process, few by-products, and high added value.
[0003] In the HPPO process, the existing PO refining tower has PO loss, resulting in a PO loss content of 0.5%. The PO product loss is high, which increases the unit consumption and energy consumption of the device; at the same time, a large amount of propylene oxide enters the back-end system, causing a series of secondary problems. On the other hand, the existing PO device produces low-pressure steam as a by-product, which is normally cooled into condensate by a cooler and then recycled, resulting in heat loss, thus causing greater economic losses. Utility Model Content
[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model provides a propylene oxide refining and recovery device, and its technical solution includes:
[0005] The first circuit includes a PO refining tower, a PO refining tower kettle pump, a manual valve V2 and a PO refining tower kettle heat exchanger which are interconnected by pipelines, and a preheating circuit is provided on the PO refining tower kettle heat exchanger;
[0006] The second line includes a PO primary separation tower, a PO primary separation tower top cooler and a PO primary separation tower top buffer tank which are interconnected by pipelines, and the first line is connected to the PO primary separation tower by a pipeline;
[0007] The third line includes a PO separation tower and a PO refining tower feed buffer tank which are interconnected by pipelines, the second line is connected to the PO refining tower feed buffer tank by a pipeline, and the third line is connected to the PO refining tower by a pipeline.
[0008] Furthermore, a fourth circuit is connected to the first circuit, and the fourth circuit includes a regulating valve V3 and a tower bottom material buffer tank.
[0009] Furthermore, a flow meter F1 is provided on the preheating circuit.
[0010] Furthermore, a flow meter F2 and a thermometer T4 are provided on the first line.
[0011] Furthermore, the PO primary separation tower is provided with a liquid level meter L1, a thermometer T2, a thermometer T3 and a thermometer T1.
[0012] Furthermore, the PO refining tower is provided with a liquid level meter L2 and a thermometer T5.
[0013] Furthermore, a fifth circuit is provided on the PO refining tower kettle heat exchanger, and the fifth circuit includes a steam trap, a manual valve V4 and a condensate tank which are interconnected by pipelines. A manual valve V1 is also connected in parallel on the fifth circuit. A PO primary tower reboiler is connected between the condensate tank and the PO primary tower through a pipeline, and a regulating valve FV1 is connected to the water inlet line of the PO primary tower reboiler.
[0014] Compared with the prior art, the utility model has the following advantages:
[0015] By recovering PO from the PO refining tower, product loss can be reduced, and the equipment investment is small, the space occupied is small, and the PO loss content is effectively controlled to be less than 1000ppm. While reducing PO loss, the impact of the lost PO on the subsequent stages of the device is reduced, the generation of system by-products is reduced, and while reducing PO loss, the waste heat of the by-product of the device is recovered, the material energy consumption of the device is reduced, and the economic benefits of the enterprise are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the utility model process.
[0017] Attached Figures: 1-PO primary separation tower; 2-PO separation tower; 3-PO refining tower; 4-thermometer T1; 5-thermometer T2; 6-thermometer T3; 7-liquid level gauge L1; 8-drain; 9-regulating valve FV1; 10-condensate tank; 11-manual valve V1; 12-flow meter F1; 13-thermometer T4; 14-PO refining tower kettle heat exchanger; 15-PO primary separation tower reboiler; 16-manual valve V2; 17-regulating valve V3; 18-kettle material buffer tank; 19-flow meter F2; 20-liquid level gauge L2; 21-PO refining tower kettle pump; 22-thermometer T5; 23-PO primary separation tower top cooler; 24-PO primary separation tower top buffer tank; 25-PO refining tower feed buffer tank; 26-manual valve V4. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0019] Example
[0020] like Figure 1 As shown:
[0021] A propylene oxide refining and recovery device, characterized in that it comprises a first circuit, wherein the first circuit comprises a PO refining tower 3, a PO refining tower kettle pump 21, a manual valve V216 and a PO refining tower kettle heat exchanger 14 which are interconnected by pipelines, and a preheating circuit is arranged on the PO refining tower kettle heat exchanger 14;
[0022] The second line includes a PO primary separation tower 1, a PO primary separation tower top cooler 23 and a PO primary separation tower top buffer tank 24 which are interconnected by pipelines, and the first line is connected to the PO primary separation tower 1 by a pipeline;
[0023] The third line includes a PO separation tower 2 and a PO refining tower feed buffer tank 25 which are interconnected by pipelines. The second line is connected to the PO separation tower 2 by a pipeline, and the third line is connected to the PO refining tower 3 by a pipeline.
[0024] The material containing PO from which PO has not been separated in the PO refining tower 3 is heated by the steam of the preheating circuit and enters the PO primary separation tower 1 through the first circuit. After the material is heated in the PO primary separation tower 1, the PO contained in the material evaporates and enters the PO separation tower 2 through the second circuit for further separation, and then is recovered through the third circuit and enters the PO refining tower 3, and is discharged and collected from the PO refining tower 3.
[0025] Among them, the steam produced as a by-product of the HPPO process enters the preheating line.
[0026] The first line is connected to a fourth line, which includes a regulating valve V317 and a bottom material buffer tank 18. When the first line fails, the regulating valve V317 can be opened to allow the material in the PO refining tower 3 to enter the bottom material buffer tank 18 for temporary storage.
[0027] A flow meter F112 is provided on the preheating line to monitor the flow of by-product steam used as preheating on the preheating line.
[0028] The first line is provided with a flow meter F219 and a thermometer T413 for monitoring the flow rate and temperature of the material on the first line.
[0029] The PO primary separation tower 1 is provided with a liquid level meter L17, a thermometer T25, a thermometer T36 and a thermometer T14. The liquid level meter L17 is used to monitor the liquid level of the material at the bottom of the PO primary separation tower 1. When the set value is reached, the first circuit is automatically closed. The thermometer T25 is used to monitor the temperature of PO separated from the material by steam heating in the PO primary separation tower 1. The thermometer T36 is used to monitor the temperature of the bottom of the material in the PO primary separation tower 1. The thermometer T14 is used to monitor the temperature of the separated PO at the top of the PO separation tower.
[0030] The PO refining tower 3 is provided with a liquid level meter L220 and a thermometer T522 for monitoring the liquid level and temperature of the material in the PO refining tower 3 .
[0031] The PO refining tower kettle heat exchanger 14 is provided with a fifth circuit, which includes a steam trap 8, a manual valve V426 and a condensate tank 10 which are interconnected by pipelines. The steam produced as a byproduct of HPPO enters the PO refining tower kettle heat exchanger 14, and the condensate formed after cooling enters the steam trap 8. The condensate in the steam trap 8 enters the condensate tank 10 for storage. The steam trap 8 prevents the steam in the PO refining tower kettle heat exchanger 14 from entering the steam trap 8. A manual valve V111 is also connected in parallel to the fifth circuit. When the steam trap 8 is In case of a fault, the manual valve V111 can be opened to allow the condensed water to enter the condensate tank 10 first. The PO primary tower reboiler 15 is connected to the condensate tank 10 and the PO primary tower 1 through a pipeline. The water inlet line of the PO primary tower reboiler 15 is connected with a regulating valve FV19. The PO primary tower reboiler 15 serves as a backup heating equipment. When the preheating circuit fails, the regulating valve FV19 is opened, and water enters the PO primary tower reboiler 15 to heat and generate steam, which enters the PO primary tower 1 as a backup heat source to heat the materials in the PO primary tower 1.
[0032] The method of using the utility model is as follows:
[0033] Open the manual valve V216, the material with unseparated PO contained in the PO refining tower 3 enters the PO refining tower kettle heat exchanger 14 through the PO refining tower kettle pump 21, exchanges heat with the by-product steam entering from the preheating line, so that the material is heated and enters the PO primary separation tower 1, the PO in the material in the PO primary separation tower 1 is evaporated and separated and enters the PO primary separation tower top cooler 23 for cooling, and after cooling, enters the PO primary separation tower top buffer tank 24 for buffering, and then enters the PO separation tower 2 to further separate the materials entrained in the PO, so that the recovered PO is purer, and then the recovered PO enters the PO refining tower feed buffer tank 25 for further buffering, and after buffering, enters the PO refining tower 3 for recovery, and is discharged from the top of the PO refining tower 3 for recovery.
Claims
1. A propylene oxide refining and recovery device, characterized in that: The method comprises a first circuit, wherein the first circuit comprises a PO refining tower (3), a PO refining tower kettle pump (21), a manual valve V2 (16) and a PO refining tower kettle heat exchanger (14) which are interconnected via pipelines, and a preheating circuit is arranged on the PO refining tower kettle heat exchanger (14); A second circuit, the second circuit comprising a PO primary separation tower (1), a PO primary separation tower top cooler (23) and a PO primary separation tower top buffer tank (24) which are interconnected via pipelines, and the first circuit is connected to the PO primary separation tower (1) via a pipeline; The third line includes a PO separation tower (2) and a PO refining tower feed buffer tank (25) which are interconnected by pipelines, the second line is connected to the PO separation tower (2) by a pipeline, and the third line is connected to the PO refining tower (3) by a pipeline.
2. A propylene oxide refining and recovery device according to claim 1, characterized in that: The first circuit is connected to a fourth circuit, and the fourth circuit includes a regulating valve V3 (17) and a tower bottom material buffer tank (18).
3. A propylene oxide refining and recovery device according to claim 1, characterized in that: The preheating line is provided with a flow meter F1 (12).
4. The propylene oxide refining and recovery device according to claim 1, characterized in that: The first line is provided with a flow meter F2 (19) and a thermometer T4 (13).
5. The propylene oxide refining and recovery device according to claim 1, characterized in that: The PO primary fractionation tower (1) is provided with a liquid level meter L1 (7), a thermometer T2 (5), a thermometer T3 (6) and a thermometer T1 (4).
6. The propylene oxide refining and recovery device according to claim 1, characterized in that: The PO refining tower (3) is provided with a liquid level meter L2 (20) and a thermometer T5 (22).
7. The propylene oxide refining and recovery device according to claim 1, characterized in that: The PO refining tower kettle heat exchanger (14) is provided with a fifth circuit, the fifth circuit comprising a steam trap (8), a manual valve V4 (26) and a condensate tank (10) which are interconnected via pipelines, a manual valve V1 (11) is also connected in parallel to the fifth circuit, a PO primary tower reboiler (15) is connected between the condensate tank (10) and the PO primary tower (1) via a pipeline, and a regulating valve FV1 (9) is connected to the water inlet circuit of the PO primary tower reboiler (15).