CN112920162A - Solvent regenerating unit - Google Patents
Solvent regenerating unit Download PDFInfo
- Publication number
- CN112920162A CN112920162A CN202110124014.4A CN202110124014A CN112920162A CN 112920162 A CN112920162 A CN 112920162A CN 202110124014 A CN202110124014 A CN 202110124014A CN 112920162 A CN112920162 A CN 112920162A
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- Prior art keywords
- solvent
- type filter
- tower
- pipeline
- basket type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000002904 solvent Substances 0.000 title claims abstract description 78
- 230000001172 regenerating effect Effects 0.000 title description 5
- 238000011084 recovery Methods 0.000 claims abstract description 38
- 239000012535 impurity Substances 0.000 claims abstract description 17
- 238000012806 monitoring device Methods 0.000 claims abstract description 10
- 230000008929 regeneration Effects 0.000 claims abstract description 10
- 238000011069 regeneration method Methods 0.000 claims abstract description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 13
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 4
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 4
- 239000012528 membrane Substances 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 239000008096 xylene Substances 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 2
- 238000005984 hydrogenation reaction Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 2
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 5
- 238000000605 extraction Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003797 solvolysis reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
- C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
- C07D333/46—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings substituted on the ring sulfur atom
- C07D333/48—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings substituted on the ring sulfur atom by oxygen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/10—Purification; Separation; Use of additives by extraction, i.e. purification or separation of liquid hydrocarbons with the aid of liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Water Supply & Treatment (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a solvent regeneration device, which belongs to the field of chemical equipment, wherein a wet solvent tank is connected with a stripping tower through a pipeline, a wet solvent tank pump and a basket type filter I are arranged on a connecting pipeline of the wet solvent tank and the stripping tower, a hydrogenation oil pipeline is connected to the stripping tower, hydrogenation oil is introduced into the stripping tower through a hydrogenation oil pipeline, the stripping tower is connected with a recovery tower through a pipeline, a stripping tower bottom pump and a basket type filter II are arranged on a connecting pipeline of the stripping tower and the recovery tower, the recovery tower is connected with the recovery tower bottom pump through a pipeline, the recovery tower bottom pump is connected with a basket type filter III through a pipeline, an online PH value monitoring device is inserted into the basket type filter III, the basket type filter tee is connected with the stripping tower through a pipeline, and a supplementary adjusting device is connected with the recovery tower through a pipeline. The solvent regeneration device can effectively filter impurities in the solvent and purify the solvent.
Description
Technical Field
The invention relates to the field of chemical equipment, in particular to a solvent regeneration device.
Background
The benzene hydrogenation device takes crude benzene as a raw material, and produces high-purity products such as benzene, toluene, xylene and the like through processes of hydrogenation, desulfurization and denitrification, extraction, rectification and the like, and byproducts are heavy benzene and non-aromatic hydrocarbon. The extracting agent used in the benzene hydrogenation extraction section is sulfolane, and in the production and operation process of the sulfolane, due to the reasons of pipeline corrosion, oxidation, impurities in materials, carrying chloride ions and the like, the quality and the PH value of a sulfolane solvent are gradually reduced, the pipeline is corroded, the content of impurities is more, the operation of the extraction section is extremely unstable, in severe cases, a filter screen at the inlet of an operating pump is frequently blocked, the operation of the operating pump of the extraction section cannot be normally operated, great troubles are brought to a production system, and how to effectively purify the solvent is particularly important.
Disclosure of Invention
The invention aims to provide a solvent regeneration device which can effectively filter impurities in a solvent and realize online cleaning of a sulfolane solvent.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a solvent regeneration device comprises a wet solvent tank, a stripping tower, a recovery tower, a PH value on-line monitoring device and a supplementary adjusting device, the wet solvent tank is connected with the stripping tower through a pipeline, a wet solvent tank pump and a basket type filter I are arranged on the connecting pipeline of the wet solvent tank and the stripping tower, the stripping tower is connected with a hydrogenated oil pipeline, hydrogenated oil is introduced into the stripping tower through the hydrogenated oil pipeline, the stripping tower is connected with the recovery tower through a pipeline, a stripping tower bottom pump and a basket type filter II are arranged on a connecting pipeline of the stripping tower and the recovery tower, the recovery tower is connected with a recovery tower bottom pump through a pipeline, the recovery tower bottom pump is connected with a basket filter III through a pipeline, the PH value on-line monitoring device is inserted into a third basket type filter, the third basket type filter is connected with the stripping tower through a pipeline, and the supplementary adjusting device is connected with the recovery tower through a pipeline.
Preferably, the supplementary adjusting device comprises a liquid inlet valve, an MEA storage tank and a demineralized water storage tank, wherein one end of the liquid inlet valve is connected with the recovery tower through a pipeline, and the other end of the liquid inlet valve is respectively connected with the MEA storage tank and the demineralized water storage tank through pipelines.
Preferably, the pH value of the on-line pH monitoring device is set to be between 5.5 and 8, and an alarm is triggered once the pH value is lower than the range.
A method of using a solvent regeneration device, comprising the steps of:
(1) during normal production, hydrogenated oil firstly enters a stripping tower, non-aromatic hydrocarbon contained in the hydrogenated oil is distilled out in the stripping tower, then the hydrogenated oil is pumped to a recovery tower through the bottom of the stripping tower, products such as benzene, toluene, xylene and the like are distilled out in the recovery tower, and then the lean solvent is sent to the stripping tower for circulation through a bottom pump of the recovery tower;
(2) the first basket type filter, the second basket type filter and the third basket type filter are arranged in the wet solvent tank, impurities in a solvent in a stripping tower are filtered out through the first basket type filter, impurities in the solvent in the stripping tower are filtered out through the second basket type filter, and impurities in the solvent in a recovery tower are filtered out through the third basket type filter;
(3) setting the pH value of the on-line pH value monitoring device to be between 5.5 and 8, triggering an alarm once the pH value is lower than the range, and then timely starting a supplementary adjusting device to supplement MEA (membrane electrode assembly) into the recovery tower so as to enable the pH value of the solvent to reach the specified range;
(4) and (4) supplementing desalted water into the recovery tower by starting the supplementing and adjusting device to replace chloride ions in the solvent.
The solvent regenerating device of the invention can obtain the following beneficial effects:
firstly, effectively filtering impurities in the solvent and purifying the solvent.
And secondly, the pH value of the solvent can be monitored at any time, and the pH value of the solvent is kept in a specified range by replenishing MEA (membrane electrode assembly).
And thirdly, supplementing desalted water to the system regularly to replace chloride ions in the solvent, so as to avoid the corrosion of the pipeline by the chloride ions.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic view of the solvent regenerating apparatus.
The labels in the above figures are: 1. a wet solvent tank; 2. a wet solvent tank pump; 3. a first basket type filter; 4. a stripping column; 5. a stripper bottom pump; 6. a basket type filter II; 7. a recovery tower; 8. a recovery tower bottom pump; 9. a basket type filter III; 10. a PH value on-line monitoring device; 11. and (4) supplementing the adjusting device.
Detailed Description
The embodiments of the present invention, such as the shapes and structures of the respective members, the mutual positions and connection relationships between the respective portions, the functions and operation principles of the respective portions, will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, in normal production, the hydrogenated oil enters the stripping tower 4 through a pipeline, the non-aromatic hydrocarbons contained in the hydrogenated oil are distilled out in the stripping tower 4, and then the hydrogenated oil is sent to the recovery tower 7 through the stripping tower bottom pump 5, products such as benzene, toluene, xylene and the like are distilled out in the recovery tower 7, and then the lean solvent is sent to the stripping tower 4 through the recovery tower bottom pump 8.
When the system is overhauled, the solvent in the system is discharged to the wet solvent tank 1 in a closed manner, and when the solvent in the system is insufficient, the solvent is supplemented to the system through the wet solvent tank pump 2, and the process is repeated.
As shown in fig. 1, a first basket filter 3, a second basket filter 6 and a third basket filter 9 are arranged between the first basket filter 3 and the second basket filter 6, impurities in a solvent in a wet solvent tank 1 are filtered out through the first basket filter 3, impurities in a solvent in a stripping tower 4 are filtered out through the second basket filter 6, impurities in a solvent in a recovery tower 7 are filtered out through the third basket filter 9, impurities carried in an operating solvent are filtered out through the second basket filter 6 and the third basket filter 9, and through the set of filtering device, impurities in the solvent are effectively filtered out, so that the normal operation of a stripping tower bottom pump 6 and a recovery tower bottom pump 8 is ensured, and the stability of the system is improved.
Solvent is at the operation in-process, because contact oxygen, factors such as chloride ion in the material lead to the solvolysis to go bad, output acid material, and the pH value of solvent can descend by a wide margin, if the pH value of solvent is adjusted untimely, along with the pH value decline of system, the corruption to the pipeline increases gradually, leads to pipeline wall attenuation, fracture easily, brings great risk to safety in production. For this purpose, the on-line solvent pH monitoring device 10 is provided to set the pH of the solvent between 5.5 and 8, and once the pH is lower than the range, an alarm is triggered, and then the replenishment regulating device 11 can be started in time to replenish MEA (note: MEA is abbreviated as ethanolamine) to the system, so that the pH of the solvent reaches the specified range.
The supplementary adjusting device 11 comprises a liquid inlet valve, an MEA storage tank and a demineralized water storage tank, wherein one end of the liquid inlet valve is connected with the recovery tower 7 through a pipeline, and the other end of the liquid inlet valve is respectively connected with the MEA storage tank and the demineralized water storage tank through pipelines. During normal production, we can supply demineralized water to recovery tower 7 by opening the feed liquor valve in supplementary adjusting device 11, and the chloridion in the solvent is fallen in the replacement, and the chloridion is very easily dissolved in demineralized water, through this step, can be better replace the chloridion in the solvent, avoids chloridion to corrode the pipeline. And the MEA can be conveyed into the recovery tower 7 by opening the switch of the MEA storage tank.
The solvent regenerating device has the following advantages: firstly, effectively filtering impurities in the solvent and purifying the solvent. And secondly, the pH value of the solvent can be monitored at any time, and the pH value of the solvent is kept in a specified range by replenishing MEA (membrane electrode assembly). And thirdly, supplementing desalted water to the system regularly to replace chloride ions in the solvent, so as to avoid the corrosion of the pipeline by the chloride ions. The device is an online sulfolane solvent purification device, not only purifies the solvent, but also keeps the pH value of the solvent, reduces the loss of the solvent and improves the economic benefit.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (4)
1. A solvent regeneration device, characterized by: the on-line PH value monitoring device is inserted into the third lifting basket type filter, the third lifting basket type filter is connected with the stripping tower through a pipeline, and the supplementary adjusting device is connected with the recovery tower through a pipeline.
2. The solvent regeneration device of claim 1, wherein: the supplementary adjusting device comprises a liquid inlet valve, an MEA storage tank and a demineralized water storage tank, wherein one end of the liquid inlet valve is connected with the recovery tower through a pipeline, and the other end of the liquid inlet valve is respectively connected with the MEA storage tank and the demineralized water storage tank through pipelines.
3. The solvent regeneration device of claim 1, wherein: the PH value of the PH value on-line monitoring device is set to be between 5.5 and 8, and an alarm is triggered once the PH value is lower than the range.
4. A method of using a solvent regeneration device, comprising the steps of:
(1) during normal production, hydrogenated oil firstly enters a stripping tower, non-aromatic hydrocarbon contained in the hydrogenated oil is distilled out in the stripping tower, then the hydrogenated oil is pumped to a recovery tower through the bottom of the stripping tower, products such as benzene, toluene, xylene and the like are distilled out in the recovery tower, and then the lean solvent is sent to the stripping tower for circulation through a bottom pump of the recovery tower;
(2) the first basket type filter, the second basket type filter and the third basket type filter are arranged in the wet solvent tank, impurities in a solvent in a stripping tower are filtered out through the first basket type filter, impurities in the solvent in the stripping tower are filtered out through the second basket type filter, and impurities in the solvent in a recovery tower are filtered out through the third basket type filter;
(3) setting the pH value of the on-line pH value monitoring device to be between 5.5 and 8, triggering an alarm once the pH value is lower than the range, and then timely starting a supplementary adjusting device to supplement MEA (membrane electrode assembly) into the recovery tower so as to enable the pH value of the solvent to reach the specified range;
(4) and (4) supplementing desalted water into the recovery tower by starting the supplementing and adjusting device to replace chloride ions in the solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110124014.4A CN112920162A (en) | 2021-01-29 | 2021-01-29 | Solvent regenerating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110124014.4A CN112920162A (en) | 2021-01-29 | 2021-01-29 | Solvent regenerating unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112920162A true CN112920162A (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110124014.4A Pending CN112920162A (en) | 2021-01-29 | 2021-01-29 | Solvent regenerating unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112920162A (en) |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1269683A (en) * | 1969-08-19 | 1972-04-06 | Universal Oil Prod Co | Process for recovering aromatic hydrocarbons |
| CN1260341A (en) * | 1999-05-28 | 2000-07-19 | 中国石油化工集团公司 | Method for separating arene from hydrocarbons mixture by use of extraction and rectification |
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| CN1430660A (en) * | 2000-04-28 | 2003-07-16 | Gtc技术公司 | Aromatic separation from petroleum streams |
| CN2709446Y (en) * | 2004-06-21 | 2005-07-13 | 韩进东 | Purification device aromatics extractant sulfolane |
| CN1660970A (en) * | 2004-02-27 | 2005-08-31 | 中国石油化工股份有限公司 | Composite solvent in use for extracting, rectifying and separating arene and method of application |
| CN101091835A (en) * | 2006-06-22 | 2007-12-26 | 中国石油化工股份有限公司 | Extractive distillation method with heat exchange through parallel connection |
| CN101168492A (en) * | 2006-10-27 | 2008-04-30 | 北京金伟晖工程技术有限公司 | Aromatic hydrocarbons extraction system and method thereof |
| CN101808962A (en) * | 2007-09-28 | 2010-08-18 | 巴斯夫欧洲公司 | Method for obtaining aromatic hydrocarbons from a hydrocarbon mixture |
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-
2021
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