CN214781578U - Online sulfolane dechlorination system capable of delaying equipment corrosion - Google Patents
Online sulfolane dechlorination system capable of delaying equipment corrosion Download PDFInfo
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- CN214781578U CN214781578U CN202120737688.7U CN202120737688U CN214781578U CN 214781578 U CN214781578 U CN 214781578U CN 202120737688 U CN202120737688 U CN 202120737688U CN 214781578 U CN214781578 U CN 214781578U
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Abstract
The utility model discloses an online sulfolane dechlorination system that can delay equipment corrosion, including feeding filter, resin exchange tower, resin trapper, the solvent buffer tank that communicates in proper order, treat that the sulfolane of purifying takes out from the sulfolane feed line of sulfolane extraction device's extraction distillation tower, get into the feeding filter the resin exchange tower the resin trapper the back is handled in proper order in the solvent buffer tank, returns in the sulfolane feed line of former sulfolane extraction device's extraction distillation tower. The utility model relates to an online sulfolane dechlorination scheme, compare the tradition and add the auxiliary agent and alleviate the corrosion method, this system does not influence the normal operating of extraction plant, the degradation speed of sulfolane is not influenced yet, dechlorination facility handling capacity is little, the flow is simple, the equipment investment is few; and moreover, the macroporous weakly basic anion exchange resin is adopted, corrosive anions in the sulfolane can be effectively removed, the exchange capacity is large, the service life of the resin is long, and the stability and the regeneration performance are good.
Description
Technical Field
The utility model relates to an oil refining chemical industry solvent extraction technical field, concretely relates to can delay online sulfolane dechlorination system of equipment corrosion.
Background
In petrochemical industry, sulfolane is an ideal aromatic hydrocarbon extraction solvent, has high density and good solubility and selectivity to aromatic hydrocarbon, and is widely applied to aromatic hydrocarbon extraction devices. In industrial operation, the color of the sulfolane solvent gradually becomes darker, acid substances are formed by degradation, the pH value is reduced, the acid substances generated by degradation and accumulated chloride ions cause equipment corrosion, and the long-period stable operation and the economic benefit of the sulfolane extraction device are seriously influenced.
At present, an extraction device regenerates a lean solvent by a reduced pressure distillation method, and monoethanolamine is added to neutralize acidic impurities, but the problem of corrosive anion corrosion cannot be fundamentally solved, the quality of aromatic hydrocarbon is easily affected, emulsification of a water system and the like are caused, and chloride ions accumulated in sulfolane cannot be well removed, so that an online sulfolane dechlorination system capable of delaying equipment corrosion is provided.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: how to solve the problem of equipment corrosion caused by the accumulation of chloride ions in a sulfolane solvent in the petrochemical solvent extraction process, and provides an on-line sulfolane dechlorination system capable of delaying equipment corrosion.
The utility model discloses a solve above-mentioned technical problem through following technical scheme, the utility model discloses a feeding filter, resin exchange tower, resin trapper, solvent buffer tank that communicate in proper order treat that the sulfolane of purifying takes out from the sulfolane feed line of sulfolane extraction device's extraction distillation tower, gets into the feeding filter the resin exchange tower the resin trapper the back is handled in proper order in the solvent buffer tank, returns among the sulfolane feed line of former sulfolane extraction device's extraction distillation tower.
Preferably, the on-line sulfolane dechlorination system further comprises a solvent heat exchanger, the solvent heat exchanger is communicated with the feed filter, and sulfolane to be purified is input by the solvent heat exchanger.
Preferably, the on-line sulfolane dechlorination system further comprises a circulating water cooler, and the solvent heat exchanger is communicated with the feed filter through the circulating water cooler.
Preferably, the online sulfolane dechlorination system further comprises a solvent return pump, one end of the solvent return pump is communicated with the solvent buffer tank, and the other end of the solvent return pump is communicated with a sulfolane feeding pipeline of an extraction distillation tower of the primary sulfolane extraction device through the solvent heat exchanger.
Preferably, the on-line sulfolane dechlorination system further comprises a sampler disposed between the solvent return pump and the solvent heat exchanger.
Preferably, the resin exchange tower adopts macroporous weak-base anion exchange resin.
Preferably, the sulfolane entering the resin exchange tower has a temperature of not more than 45 ℃ and a mass space velocity of 6.0hr-1。
Preferably, the feeding filter and the resin catcher are both provided with a back washing assembly, the back washing assembly judges the pressure drop of the feeding filter/the resin catcher through pressure gauges arranged at the inlet and the outlet of the feeding filter/the resin catcher, and back washing is carried out by adopting desalted water.
Compared with the prior art, the utility model has the following advantages: compared with the traditional method for alleviating corrosion by adding the auxiliary agent, the system does not influence the normal operation of the extraction device, the degradation speed of the sulfolane is not influenced, the processing amount of a dechlorination facility is small, the flow is simple, and the equipment investment is small; and moreover, the macroporous weakly basic anion exchange resin is adopted, corrosive anions in the sulfolane can be effectively removed, the exchange capacity is large, the service life of the resin is long, the stability and the regeneration performance are good, and the resin is worthy of being popularized and used.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
In the figure, 1-solvent heat exchanger; 2-a circulating water cooler; 3-a feed filter; 4-a resin exchange column; 5-a resin trap; 6-solvent buffer tank; 7-solvent return pump; 8-sealing the sampler; 9-a flow meter; 10. -a first thermometer; 11-a second thermometer; 12. a first pressure gauge; 13. a second pressure gauge; 14. a third pressure gauge; 15. a fourth pressure gauge; 16-a fifth pressure gauge; 17-liquid level meter.
Detailed Description
The embodiments of the present invention will be described in detail below, and the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, the present embodiment provides a technical solution: an online sulfolane dechlorination system capable of delaying equipment corrosion comprises a solvent heat exchanger 1, a circulating water cooler 2, a feeding filter 3, a resin exchange tower 4, a resin catcher 5, a solvent buffer tank 6 and a solvent return pump 7. The online sulfolane dechlorination system is supported by the extraction device, the solvent extraction amount is small, and the normal operation of the extraction device is not influenced; the corrosion inhibition rate of the purified sulfolane equipment can reach more than 70 percent, and the corrosion of the equipment can be remarkably delayed; and has the excellent characteristics of short flow, simple equipment, small occupied area and low investment.
In this example, the sulfolane to be purified is fed by precise metering by means of a flow meter 9, the amount of withdrawal being strictly controlled; the purified and dechlorinated sulfolane is heated by the solvent heat exchanger 1 and then returns to the extraction system, the temperature is close to the feeding temperature of the extraction distillation tower, and the influence on the heat balance of the device is avoided.
In this embodiment, the resin exchange tower 4 is made of macroporous weakly basic anion exchange resin, and the temperature of the inlet tower is strictly controlled to be not more than 45 ℃ by the second thermometer 11 at the outlet of the circulating water cooler 2, and the mass space velocity is 6.0hr-1. The macroporous alkalescent anion exchange resin can effectively remove corrosive anions in the resin, and has the advantages of good purification effect, large exchange capacity, long service life of the resin, stable performance and regeneration performance.
In this example, the deterioration rate before and after purification of sulfolane treated by the resin exchange column 4 was uniform, and the service life of sulfolane was not affected.
In this embodiment, the feeding filter 3 and the resin catcher 5 both adopt automatic back flushing assemblies, the pressure drop of the feeding filter 3 and the resin catcher 5 is judged through a first pressure gauge 12, a second pressure gauge 13, a third pressure gauge 14 and a fourth pressure gauge 15 which are correspondingly arranged at the inlet and the outlet of the feeding filter, and back flushing is performed by using desalted water, so that operation and maintenance of workers are facilitated, and waste liquid is discharged in a sealed manner after flushing.
In this embodiment, a sampler 8 is disposed at an outlet of the solvent return pump 7 to sample purified sulfolane, the ion exchange resin is regenerated when sampling is unqualified, and an inlet and an outlet for regenerated alkali are reserved at upper and lower parts of the resin exchange tower 4.
In order to not influence the operation of the original device, the temperature of the sulfolane material entering the extraction distillation tower is kept unchanged by adjusting the heat exchanger of the original extraction device and controlling the temperature of the material fed into a boundary area.
When the ion exchange resin reaches the exchange capacity after being used for a certain period of time or the sulfolane purified by the resin does not meet the specified requirement, the resin is regenerated. An inlet and an outlet of regenerated alkali liquor are reserved at the upper part and the lower part of the resin exchange tower 4, and the regenerated liquid adopts 3 percent sodium hydroxide aqueous solution.
Because the freezing point of the lean solvent is higher and the flow rate of the lean solvent is lower, the solvent pipeline and equipment are accompanied by hot water and insulated to prevent the material from freezing.
The working principle is as follows: extracting a small part of sulfolane lean solvent in front of an extraction distillation tower of an original sulfolane extraction device, strictly controlling the flow rate to enter a sulfolane dechlorination system, cooling the sulfolane lean solvent and the purified sulfolane solvent through a solvent heat exchanger 1, cooling the solvent and the purified sulfolane solvent to about 42 ℃ through a circulating water cooler 2, filtering mechanical impurities in the solvent and the purified sulfolane solvent through a feeding filter 3, and then entering a resin exchange tower 4; the sulfolane lean solvent flows through the resin exchange tower 4 from top to bottom to perform ion exchange with the resin to remove acidic substances therein, and the mass space velocity is 6.0hr-1. The lean solvent purified by the resin exchange tower 4 is removed with resin powder possibly carried by the lean solvent through a resin catcher 5, and then enters a solvent buffer tank 6, and then enters a solvent heat exchanger 1 after being pressurized by a solvent return pump 7, and enters the systemAnd (3) carrying out heat exchange and temperature rise on the sulfolane lean solvent, returning to a sulfolane feeding pipeline of the original extraction device, and mixing with the circulating sulfolane lean solvent.
In summary, the online sulfolane dechlorination system capable of delaying equipment corrosion is an online sulfolane dechlorination scheme, and compared with the traditional method for adding an auxiliary agent to relieve corrosion, the system does not influence the normal operation of an extraction device, the degradation speed of sulfolane is not influenced, the treatment capacity of a dechlorination facility is small, the process is simple, and the equipment investment is small; and moreover, the macroporous weakly basic anion exchange resin is adopted, corrosive anions in the sulfolane can be effectively removed, the exchange capacity is large, the service life of the resin is long, the stability and the regeneration performance are good, and the resin is worthy of being popularized and used.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (8)
1. An online sulfolane dechlorination system capable of delaying equipment corrosion is characterized in that: the purifying device comprises a feeding filter, a resin exchange tower, a resin catcher and a solvent buffer tank which are sequentially communicated, wherein sulfolane to be purified is extracted from a sulfolane feeding pipeline of an extraction distillation tower of a sulfolane extraction device, enters the feeding filter, the resin exchange tower, the resin catcher and the solvent buffer tank to be sequentially treated and then returns to the sulfolane feeding pipeline of the extraction distillation tower of the original sulfolane extraction device.
2. The system of claim 1, wherein the system comprises: the on-line sulfolane dechlorination system also comprises a solvent heat exchanger, wherein the solvent heat exchanger is communicated with the feeding filter, and sulfolane to be purified is input by the solvent heat exchanger.
3. The system of claim 2, wherein the system comprises: the on-line sulfolane dechlorination system further comprises a circulating water cooler, and the solvent heat exchanger is communicated with the feeding filter through the circulating water cooler.
4. The system of claim 3, wherein the system comprises: the online sulfolane dechlorination system also comprises a solvent return pump, wherein one end of the solvent return pump is communicated with the solvent buffer tank, and the other end of the solvent return pump is communicated with a sulfolane feeding pipeline of an extraction distillation tower of the primary sulfolane extraction device through the solvent heat exchanger.
5. The system of claim 4, wherein the system comprises: the online sulfolane dechlorination system further comprises a sampler disposed between the solvent return pump and the solvent heat exchanger.
6. The system of claim 1, wherein the system comprises: macroporous weak-base anion exchange resin is adopted in the resin exchange tower.
7. The system of claim 1, wherein the system comprises: the sulfolane entering the resin exchange tower has a temperature not higher than 45 deg.C and a mass space velocity of 6.0hr-1。
8. The system of claim 5, wherein the system comprises: the feeding filter and the resin catcher are both provided with back washing components, the back washing components judge the pressure drop of the feeding filter/the resin catcher through pressure gauges arranged at the inlet and the outlet of the feeding filter/the resin catcher, and back washing is carried out by desalted water.
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| CN202120737688.7U CN214781578U (en) | 2021-04-12 | 2021-04-12 | Online sulfolane dechlorination system capable of delaying equipment corrosion |
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| CN202120737688.7U CN214781578U (en) | 2021-04-12 | 2021-04-12 | Online sulfolane dechlorination system capable of delaying equipment corrosion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115672410A (en) * | 2022-11-07 | 2023-02-03 | 国家能源集团煤焦化有限责任公司 | Regeneration system for sulfolane regeneration and regeneration system |
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2021
- 2021-04-12 CN CN202120737688.7U patent/CN214781578U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115672410A (en) * | 2022-11-07 | 2023-02-03 | 国家能源集团煤焦化有限责任公司 | Regeneration system for sulfolane regeneration and regeneration system |
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