CN216825564U - Ethylene glycol rectification tail gas recovery system - Google Patents
Ethylene glycol rectification tail gas recovery system Download PDFInfo
- Publication number
- CN216825564U CN216825564U CN202220351835.1U CN202220351835U CN216825564U CN 216825564 U CN216825564 U CN 216825564U CN 202220351835 U CN202220351835 U CN 202220351835U CN 216825564 U CN216825564 U CN 216825564U
- Authority
- CN
- China
- Prior art keywords
- ethylene glycol
- methanol
- tower
- rectification
- communicated
- 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.)
- Active
Links
Images
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses an ethylene glycol rectification tail gas recovery system, which comprises an ethylene glycol rectification tower, an ethylene glycol rectification tower top condenser, an ethylene glycol storage tank, an ethylene glycol rectification tower reflux tank, a liquid ring vacuum pump, a methanol rectification tower top condenser and a methanol rectification tower reflux tank; has the advantages that: 1. the ethylene glycol tail gas recovery system can recover ethylene glycol and methanol contained in the ethylene glycol rectification tail gas, so that resource utilization is realized; 2. the ethylene glycol is used as the working solution of the liquid ring vacuum pump, so that methanol and a small amount of ethylene glycol in tail gas can be absorbed into the ethylene glycol working solution without washing with water, the equipment investment and the treatment cost of wastewater treatment are saved, and the device is environment-friendly and economical.
Description
The technical field is as follows:
the utility model relates to a tail gas treatment technical field especially relates to a processing apparatus of ethylene glycol rectification tail gas.
Background art:
the main technical problems in the rectification production process of ethylene glycol are production cost control, material recycling, product quality and energy-saving technology, wherein the production cost control and the material recycling become key points of industrial research, the production cost is reduced, and the improvement of the product quality becomes a main link of ethylene glycol production enterprises occupying the market. In order to improve the quality of ethylene glycol products and meet the quality standard of polyester-grade ethylene glycol (GB/T4649-2018), the optimization of the ethylene glycol rectification technology is important, a large amount of recyclable materials are discharged in the rectification process of the ethylene glycol, and the tail gas mainly comprises nitrogen, oxygen, moisture and methanol and a small amount of ethylene glycol. At present, glycol rectification tail gas is mainly treated by washing with desalted water, and waste water generated after washing is treated as sewage. The treatment mode causes the increase of sewage treatment load and treatment cost, increases the environmental protection investment, and causes the waste of resources because glycol and methanol in tail gas can not be effectively utilized.
The utility model has the following contents:
an object of the utility model is to provide an ethylene glycol rectification tail gas recovery system.
The utility model discloses by following technical scheme implement: an ethylene glycol rectification tail gas recovery system comprises an ethylene glycol rectification tower, an overhead condenser of the ethylene glycol rectification tower, an ethylene glycol storage tank, a reflux tank of the ethylene glycol rectification tower, a liquid ring vacuum pump, a methanol rectification tower, an overhead condenser of the methanol rectification tower and a reflux tank of the methanol rectification tower, wherein a gas phase outlet at the top of the ethylene glycol rectification tower is communicated with an inlet of the overhead condenser of the ethylene glycol rectification tower, and a tower kettle outlet of the ethylene glycol rectification tower is communicated with an inlet of the ethylene glycol storage tank;
a liquid phase outlet of the top condenser of the ethylene glycol rectifying tower is communicated with an inlet of a reflux tank of the ethylene glycol rectifying tower, an outlet of the reflux tank of the ethylene glycol rectifying tower is communicated with a feed inlet of the methanol rectifying tower, a gas phase outlet of the top condenser of the methanol rectifying tower is communicated with a gas phase inlet of the top condenser of the methanol rectifying tower, a liquid phase outlet of the top condenser of the methanol rectifying tower is communicated with an inlet of the reflux tank of the methanol rectifying tower, and an outlet of the reflux tank of the methanol rectifying tower is communicated with a feed inlet of an ethylene glycol production system;
and a tail gas outlet of the condenser at the top of the ethylene glycol rectifying tower is communicated with a gas phase inlet of the liquid ring vacuum pump, and a liquid phase outlet of the liquid ring vacuum pump is communicated with a feed inlet of the ethylene glycol rectifying tower.
Preferably, a gas phase outlet of the condenser at the top of the methanol rectifying tower and a gas phase outlet of the liquid ring vacuum pump are both communicated with an inlet of a tail gas treatment system.
Preferably, the device further comprises a working liquid storage tank, and an outlet of the working liquid storage tank is communicated with a liquid phase inlet of the liquid ring vacuum pump.
Preferably, the working fluid contained in the working fluid storage tank is ethylene glycol.
Preferably, a liquid phase outlet at the top of the ethylene glycol rectifying tower is communicated with a feed inlet of the methanol rectifying tower.
The utility model has the advantages that: 1. the ethylene glycol tail gas recovery system can recover ethylene glycol and methanol contained in the ethylene glycol rectification tail gas, so that resource utilization is realized; 2. the ethylene glycol is used as the working solution of the liquid ring vacuum pump, so that methanol and a small amount of ethylene glycol in tail gas can be absorbed into the ethylene glycol working solution without washing with water, the equipment investment and the treatment cost of wastewater treatment are saved, and the device is environment-friendly and economical.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic system connection diagram of the present embodiment;
in the figure: 1. the system comprises an ethylene glycol rectifying tower, 2, an overhead condenser of the ethylene glycol rectifying tower, 3, an ethylene glycol storage tank, 4, a reflux tank of the ethylene glycol rectifying tower, 5, a liquid ring vacuum pump, 6, a methanol rectifying tower, 7, a overhead condenser of the methanol rectifying tower, 8, a reflux tank of the methanol rectifying tower, 9 and a working solution storage tank.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1:
as shown in fig. 1: an ethylene glycol rectification tail gas recovery system comprises an ethylene glycol rectification tower 1, an ethylene glycol rectification tower top condenser 2, an ethylene glycol storage tank 3, an ethylene glycol rectification tower reflux tank 4, a liquid ring vacuum pump 5, a methanol rectification tower 6, a methanol rectification tower top condenser 7, a methanol rectification tower reflux tank 8 and a working liquid storage tank 9, wherein a tower top gas phase outlet of the ethylene glycol rectification tower 1 is communicated with an inlet of the ethylene glycol rectification tower top condenser 2, a tower bottom outlet of the ethylene glycol rectification tower 1 is communicated with an inlet of the ethylene glycol storage tank 3, and a tower top liquid phase outlet of the ethylene glycol rectification tower 1 is communicated with a feed inlet of the methanol rectification tower 6;
a liquid phase outlet of a condenser 2 at the top of the ethylene glycol rectifying tower is communicated with an inlet of a reflux tank 4 of the ethylene glycol rectifying tower, an outlet of the reflux tank 4 of the ethylene glycol rectifying tower is communicated with a feed inlet of a methanol rectifying tower 6, a gas phase outlet at the top of the methanol rectifying tower 6 is communicated with a gas phase inlet of a condenser 7 at the top of the methanol rectifying tower, a liquid phase outlet of the condenser 7 at the top of the methanol rectifying tower is communicated with an inlet of a reflux tank 8 of the methanol rectifying tower, and an outlet of the reflux tank 8 of the methanol rectifying tower is communicated with a feed inlet of an ethylene glycol production system;
the tail gas outlet of the condenser 2 at the top of the ethylene glycol rectifying tower is communicated with the gas phase inlet of the liquid ring vacuum pump 5, the liquid phase outlet of the liquid ring vacuum pump 5 is communicated with the feed inlet of the ethylene glycol rectifying tower 1, the liquid phase inlet of the liquid ring vacuum pump 5 is communicated with the outlet of the working liquid storage tank 9, and the working liquid contained in the working liquid storage tank 9 is ethylene glycol. And a gas phase outlet of the methanol rectifying tower top condenser 7 and a gas phase outlet of the liquid ring vacuum pump 5 are both communicated with an inlet of the tail gas treatment system.
The working description is as follows: the effective components of the ethylene glycol rectification tail gas are ethylene glycol and methanol, the ethylene glycol and methanol enter a condenser 2 at the top of an ethylene glycol rectification tower from the top of the ethylene glycol rectification tower 1 through a pipeline, after condensation, the gas phase materials including gas phase ethylene glycol, gas phase methanol, nitrogen and oxygen enter the liquid ring vacuum pump 5 for vacuum pumping, the pressure at the top of the ethylene glycol rectifying tower 1 is kept at a negative pressure condition, the working liquid of the liquid ring vacuum pump 5 is ethylene glycol, the gas-phase ethylene glycol and the gas-phase methanol are absorbed by the ethylene glycol working liquid in the liquid ring vacuum pump 5, the gas-phase ethylene glycol and the gas-phase methanol are conveyed to a feed inlet of the ethylene glycol rectifying tower 1 through a pipeline from a liquid phase outlet of the liquid ring vacuum pump 5, the ethylene glycol which is rectified and purified again is conveyed to an ethylene glycol storage tank 3 from a tower bottom outlet of the ethylene glycol rectifying tower 1, and a small amount of the gas-phase methanol, the nitrogen and the oxygen are conveyed to a tail gas treatment system for combustion treatment through a pipeline from a gas phase outlet by the liquid ring vacuum pump 5; the liquid phase material mainly comprises methanol and water, the methanol and the water are conveyed from a liquid phase outlet of a condenser of the ethylene glycol rectifying tower to a reflux tank 4 of the ethylene glycol rectifying tower through pipelines to be buffered, and then are conveyed into a methanol rectifying tower 6 together with a methanol solution collected from the top of the ethylene glycol rectifying tower 1, the gas phase methanol collected from the top of the methanol rectifying tower 6 is condensed by a condenser 7 at the top of the methanol rectifying tower, a small amount of gas phase methanol, nitrogen and oxygen are conveyed into a tail gas treatment system through pipelines to be combusted, and the liquid phase methanol is conveyed into an ethylene glycol production system through pipelines to be recycled. The purity of the methanol obtained after rectification can reach 99.8%.
For the production scale of 50 ten thousand tons of ethylene glycol produced annually, the application of the ethylene glycol rectification tail gas recovery system can reduce 8640 tons of wastewater discharge annually, and the saved wastewater treatment cost and the saved cost of the recovered methanol are about 55 ten thousand yuan.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. An ethylene glycol rectification tail gas recovery system comprises an ethylene glycol rectification tower, an overhead condenser of the ethylene glycol rectification tower, an ethylene glycol storage tank, a reflux tank of the ethylene glycol rectification tower, a liquid ring vacuum pump, a methanol rectification tower, an overhead condenser of the methanol rectification tower and a reflux tank of the methanol rectification tower, and is characterized in that a gas phase outlet at the top of the ethylene glycol rectification tower is communicated with an inlet of the overhead condenser of the ethylene glycol rectification tower, and a tower kettle outlet of the ethylene glycol rectification tower is communicated with an inlet of the ethylene glycol storage tank;
a liquid phase outlet of the top condenser of the ethylene glycol rectifying tower is communicated with an inlet of a reflux tank of the ethylene glycol rectifying tower, an outlet of the reflux tank of the ethylene glycol rectifying tower is communicated with a feed inlet of the methanol rectifying tower, a gas phase outlet of the top condenser of the methanol rectifying tower is communicated with a gas phase inlet of the top condenser of the methanol rectifying tower, a liquid phase outlet of the top condenser of the methanol rectifying tower is communicated with an inlet of the reflux tank of the methanol rectifying tower, and an outlet of the reflux tank of the methanol rectifying tower is communicated with a feed inlet of an ethylene glycol production system;
and a tail gas outlet of the condenser at the top of the ethylene glycol rectifying tower is communicated with a gas phase inlet of the liquid ring vacuum pump, and a liquid phase outlet of the liquid ring vacuum pump is communicated with a feed inlet of the ethylene glycol rectifying tower.
2. The ethylene glycol rectification tail gas recovery system according to claim 1, wherein a gas phase outlet of the methanol rectification tower top condenser and a gas phase outlet of the liquid ring vacuum pump are both communicated with an inlet of a tail gas treatment system.
3. The ethylene glycol rectification tail gas recovery system according to claim 1, further comprising a working liquid storage tank, wherein an outlet of the working liquid storage tank is communicated with a liquid phase inlet of the liquid ring vacuum pump.
4. The ethylene glycol rectification tail gas recovery system according to claim 3, wherein the working fluid contained in the working fluid storage tank is ethylene glycol.
5. The ethylene glycol rectification tail gas recovery system according to claim 1, wherein a liquid phase outlet at the top of the ethylene glycol rectification tower is communicated with a feed inlet of the methanol rectification tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220351835.1U CN216825564U (en) | 2022-02-21 | 2022-02-21 | Ethylene glycol rectification tail gas recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220351835.1U CN216825564U (en) | 2022-02-21 | 2022-02-21 | Ethylene glycol rectification tail gas recovery system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216825564U true CN216825564U (en) | 2022-06-28 |
Family
ID=82091112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220351835.1U Active CN216825564U (en) | 2022-02-21 | 2022-02-21 | Ethylene glycol rectification tail gas recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216825564U (en) |
-
2022
- 2022-02-21 CN CN202220351835.1U patent/CN216825564U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN216825564U (en) | Ethylene glycol rectification tail gas recovery system | |
| CN212282917U (en) | System for separating and recovering methanol as by-product of dimethylaminoethyl acrylate | |
| CN212092200U (en) | Recovery system of polymerization tail gas | |
| CN104941355A (en) | Comprehensive recovery tower for tail gas in sodium benzoate production process | |
| CN111252833B (en) | Wastewater treatment process for producing epoxy chloropropane by oxidizing chloropropene | |
| CN213951097U (en) | Carbide slag slurry acetylene gas's recycle system | |
| CN210786817U (en) | Device for recovering effective components of rectification residues and comprehensively treating waste gas in polyvinyl alcohol production process | |
| CN214299948U (en) | A recovery unit that is arranged in dibutyl urea waste water to go to | |
| CN201684433U (en) | Multistage condensation recovery device | |
| CN209735013U (en) | Waste heat utilization device in organosilicon monomer production process | |
| CN210176768U (en) | Treatment system for tail gas of chlorohydrination method propylene oxide device | |
| CN209778700U (en) | toluene and butanone rectification system used in environment-friendly recovery process of VOCs-containing tail gas | |
| CN109824481B (en) | Improvement method for improving yield of acetaldehyde system | |
| CN215462113U (en) | Rectifying energy-saving device in cyclohexene method cyclohexanol production process | |
| CN218596157U (en) | Thioether waste water rectifier unit | |
| CN214862388U (en) | Waste gas treatment recovery system during shutdown converter | |
| CN211394165U (en) | Novel dehydration device for difluoromethane finished product | |
| CN220912577U (en) | Helium detection system with helium purification function | |
| CN210279181U (en) | Furfuryl alcohol reaction liquid catalyst separator | |
| CN219050365U (en) | PVC system high-boiling-point material recycling device | |
| CN219567583U (en) | Dilute hydrochloric acid treatment system | |
| CN215782651U (en) | Environmental protection treatment facility to recoverable waste gas | |
| CN103449550B (en) | Acid-containing ammonia-containing wastewater treatment method capable of saving high-temperature position steam | |
| CN216170056U (en) | System for separating isopropanol and water by extractive distillation | |
| CN218231929U (en) | Waste water strip processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |