CN215962208U - Ethylene glycol rectification anticorrosion system - Google Patents
Ethylene glycol rectification anticorrosion system Download PDFInfo
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- CN215962208U CN215962208U CN202122390187.9U CN202122390187U CN215962208U CN 215962208 U CN215962208 U CN 215962208U CN 202122390187 U CN202122390187 U CN 202122390187U CN 215962208 U CN215962208 U CN 215962208U
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- dehydration tower
- ethylene glycol
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The utility model discloses an ethylene glycol rectification anti-corrosion system, which comprises a dehydration tower reflux tank, an alkali liquor analysis pipeline, a desalination water pipeline, an alkali liquor adding pipeline and a dehydration tower reflux pipeline, wherein the dehydration tower reflux tank is connected with the dehydration tower reflux tank through the alkali liquor analysis pipeline; one end of the reflux pipeline of the dehydration tower is connected with the outlet of the reflux tank of the dehydration tower; one end of the alkali liquor analysis pipeline is connected with a dehydration tower reflux pipeline, the other end of the alkali liquor analysis pipeline is connected with an inlet of a dehydration tower reflux tank, and a PH analyzer is arranged on the alkali liquor analysis pipeline; one end of the desalting water pipeline is connected with desalted water, and the other end of the desalting water pipeline is connected with an inlet of a reflux tank of the dehydrating tower; one end of the alkali liquor adding pipeline is connected with alkali liquor, the other end of the alkali liquor adding pipeline is connected with the desalination water pipeline, and an alkali liquor pipeline flow regulating valve is arranged on the alkali liquor adding pipeline. The pH value in the reflux tank of the dehydration tower can be monitored, the pH value in the ethanol product tower is maintained, and the condition that a subsequent system is corroded by acid is reduced.
Description
Technical Field
The utility model belongs to the field of ethylene glycol rectification, and relates to an ethylene glycol rectification anti-corrosion system.
Background
The same type of device, operating less than a year in the same industry: the ethanol separation system always operates normally, and the purity of the ethanol product is always maintained to be about 80 percent because the price difference between 80 percent ethanol and 90 percent ethanol products in the market is not large. And (3) later-period inspection, in a fusel oil preheater (for exchanging heat between the feeding material of the de-ethanol tower and the wastewater in the ethanol product tower), introducing and spraying the wastewater at an inlet and an outlet, and sampling to detect the COD content. The COD content is less than or equal to 200mgO2/L in normal operation, and the COD exceeding the standard in the detection result is judged to be the corrosion leakage of the heat exchanger tube. And then stopping the ethanol separation system to boil the tower, and after sampling at the nine-tower kettle, finding that more suspended matters exist in the sample, and judging the sample to be the suspended matters formed after the corrosion of the internal parts of the tower. The tower entering inspection shows that the inner parts (groove type liquid distributors) of the bottommost tower collapse and the packing is also corroded seriously. Firstly, adding alkali liquor DN15 in a feeding pipeline of the de-ethanol tower, wherein the mixing space of the materials and the alkali liquor is small, the pH fluctuation is overlarge, the operation difficulty is large, and the corrosion of the internal parts of the tower is caused.
The reason for analyzing the method is mainly as follows: the oxalate method takes coal as a raw material, and obtains CO and H2 respectively after gasification, transformation, purification, separation and purification, wherein the CO is synthesized and refined through catalytic coupling to produce oxalate, and the oxalate is subjected to hydrogenation reaction with H2 and is refined to obtain polyester-grade ethylene glycol. Wherein, the mixed monohydric alcohol generated by the methanol recovery tower and the dehydration tower is sent to an ethanol separation device for continuous separation, the activity of the catalyst is reduced at the end of the hydrogenation catalyst, a trace amount of oxalate penetrates through the catalyst bed layer and enters a rectification working section, and the oxalate reacts with a hydrogenation byproduct H2O in the subsequent flow to generate oxalic acid; oxalic acid is separated by a methanol recovery tower (a tower), a methanol removing tower (a seventh tower) and a dehydration tower (a second tower) in an ethylene glycol rectification working section, and then is pumped to an ethanol removing tower (an eighth tower) and an ethanol product tower (a ninth tower) along with light components (fusel oil) for rectification.
Oxalic acid is continuously concentrated in the process, the highest concentration position is a nine-tower kettle (the pH value of the wastewater is 2 when the pH value is the lowest), and then an ethanol removal tower kettle (the acidity is 5-7%) is arranged, so that the ethanol product tower is seriously corroded.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide an ethylene glycol rectification anti-corrosion system which can monitor the pH value in a reflux tank of a dehydration tower, maintain the pH value in an ethanol product tower and reduce the corrosion of a subsequent system by acid and alkali.
In order to achieve the purpose, the utility model adopts the following technical scheme to realize the purpose:
an ethylene glycol rectification anti-corrosion system comprises a dehydration tower reflux tank, an alkali liquor analysis pipeline, a desalination water pipeline, an alkali liquor adding pipeline and a dehydration tower reflux pipeline;
one end of the reflux pipeline of the dehydration tower is connected with the outlet of the reflux tank of the dehydration tower; one end of the alkali liquor analysis pipeline is connected with a dehydration tower reflux pipeline, the other end of the alkali liquor analysis pipeline is connected with an inlet of a dehydration tower reflux tank, and a PH analyzer is arranged on the alkali liquor analysis pipeline; one end of the desalting water pipeline is connected with desalted water, and the other end of the desalting water pipeline is connected with an inlet of a reflux tank of the dehydrating tower; one end of the alkali liquor adding pipeline is connected with alkali liquor, the other end of the alkali liquor adding pipeline is connected with the desalination water pipeline, and an alkali liquor pipeline flow regulating valve is arranged on the alkali liquor adding pipeline.
Preferably, the alkali liquor adding pipeline is provided with an alkali liquor pipeline flow meter.
Further, the model of the alkaline liquid line flowmeter is OPTIFLUX4100C
Preferably, the pipe diameter of the alkali liquor adding pipeline is DN 20-40.
Further, the pipe diameter of the alkali liquor adding pipeline is DN 25.
Preferably, a reflux pump of the dehydration tower is arranged on the reflux line of the dehydration tower.
Preferably, the model of the alkali liquid line flow regulating valve is F101-LP 1.
Preferably, the pH analyzer is model 1066-P-HT-60.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model changes the alkali adding position into the reflux tank of the dehydration tower, can indirectly or continuously analyze the pH value through a pH analyzer on an alkali liquor analysis pipeline, and can pertinently adjust the opening degree of the alkali liquor flow regulating valve through the real-time pH value, so that the pH value entering a subsequent system is maintained at a normal level, and the condition that the subsequent system is corroded by acid and alkali is avoided.
Furthermore, a reflux tank is selected as an alkali liquor mixing container, so that the alkali liquor mixing space is large, the pH fluctuation is small, and the operation difficulty is small.
Drawings
FIG. 1 is a schematic diagram of a glycol rectification corrosion prevention system of the present invention.
Wherein: 1-a dehydration tower reflux tank; 2-a reflux pump of the dehydration tower; 3-a desalted water line; 4-an alkaline line flow meter; 5-a dehydration column reflux line; 6-pH analyzer; 7-alkali liquor line flow regulating valve; 8-alkali liquor analysis pipeline; 9-alkali liquor adding pipeline.
Detailed Description
The utility model is described in further detail below with reference to the accompanying drawings:
as shown in FIG. 1, the ethylene glycol rectification anti-corrosion system according to the present invention comprises a dehydration tower reflux tank 1, an alkali solution analysis pipeline 8, a desalted water pipeline 3, an alkali solution adding pipeline 9 and a dehydration tower reflux pipeline 5.
One end of a reflux pipeline 5 of the dehydration tower is connected with the outlet of the reflux tank 1 of the dehydration tower; one end of an alkali liquor analysis pipeline 8 is connected with a dehydration tower reflux pipeline 5, the other end of the alkali liquor analysis pipeline is connected with an inlet of a dehydration tower reflux tank 1, and a pH analyzer 6 is arranged on the alkali liquor analysis pipeline 8; one end of the desalting water pipeline 3 is connected with desalted water, and the other end is connected with an inlet of the reflux tank 1 of the dehydrating tower; one end of an alkali liquor adding pipeline 9 is connected with alkali liquor, the other end of the alkali liquor adding pipeline 9 is connected with a desalination water pipeline 3, and an alkali liquor line flow regulating valve 7 and an alkali liquor line flow meter 4 are arranged on the alkali liquor adding pipeline 9.
The dehydration tower reflux pipeline 5 is provided with a dehydration tower reflux pump 2.
Firstly, adding alkali liquor DN15 into a feeding pipeline of the de-ethanol tower, wherein the mixing space of the materials and the alkali liquor is small in the neutralization process, the pH fluctuation is overlarge, and the operation difficulty is large; and then the alkali adding position is changed into a dehydrating tower reflux tank 1, the pipe diameter of an alkali adding liquid pipeline 9 is DN20-40, the preferable pipe diameter of the implementation is DN25, the alkali liquid mixing space is large, the pH fluctuation is small, and the operation difficulty is small.
When the ethylene glycol rectification anti-corrosion system is used for adjusting the pH value, alkali is indirectly or continuously added into the reflux tank 1 of the dehydration tower through the alkali adding pipeline 9, the pH value is indirectly or continuously detected through the pH analyzer 6, the pH value is fed back to the alkali adding pipeline flowmeter 4 on the alkali adding pipeline 9, when the pH value detected by the pH analyzer 6 is less than 7, the alkali pipeline flow regulating valve 7 is opened to control the flow, so that the pH value entering the ethanol analysis system is maintained at about 7-8, and the subsequent system cannot be corroded by acid and alkali.
As shown in Table 2, the ET content in the ethanol product reaches over 90 percent and can be stabilized at 94 percent at most after the improvement of the method.
TABLE 2 ethanol product column operating index
According to the operation experience of the chemical industry in the same industry, DMO penetrates seriously in the final stage of the hydrogenation catalyst, and the corrosion to equipment is aggravated after oxalic acid generated by the subsequent reaction is continuously concentrated. An alkali liquor line of the dehydration tower reflux tank 1 is added, and an alkali liquor line flow meter 4, an alkali liquor line flow regulating valve 7 and a pH analyzer 6 are arranged, so that the device is favorable for long-period operation.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (8)
1. An ethylene glycol rectification anti-corrosion system is characterized by comprising a dehydration tower reflux tank (1), an alkali liquor analysis pipeline (8), a desalination water pipeline (3), an alkali liquor adding pipeline (9) and a dehydration tower reflux pipeline (5);
one end of a reflux pipeline (5) of the dehydration tower is connected with the outlet of the reflux tank (1) of the dehydration tower; one end of an alkali liquor analysis pipeline (8) is connected with a dehydrating tower reflux pipeline (5), the other end of the alkali liquor analysis pipeline is connected with an inlet of a dehydrating tower reflux tank (1), and a pH analyzer (6) is arranged on the alkali liquor analysis pipeline (8); one end of the desalted water pipeline (3) is connected with desalted water, and the other end of the desalted water pipeline is connected with an inlet of the reflux tank (1) of the dehydration tower; one end of the alkali liquor adding pipeline (9) is connected with alkali liquor, the other end is connected with the desalting water pipeline (3), and the alkali liquor adding pipeline (9) is provided with an alkali liquor line flow regulating valve (7).
2. The ethylene glycol rectification corrosion prevention system according to claim 1, wherein the lye line (9) is provided with a lye line flow meter (4).
3. The ethylene glycol rectification corrosion protection system of claim 2, wherein the caustic flow line meter (4) is part number OPTIFLUX 4100C.
4. The ethylene glycol rectification anti-corrosion system according to claim 1, wherein the pipe diameter of the alkali adding liquid pipeline (9) is DN 20-40.
5. The ethylene glycol rectification anti-corrosion system according to claim 4, wherein the pipe diameter of the alkali adding liquid pipeline (9) is DN 25.
6. The ethylene glycol rectification corrosion prevention system according to claim 1, wherein a dehydration column reflux pump (2) is provided on the dehydration column reflux line (5).
7. The ethylene glycol rectification anti-corrosion system according to claim 1, wherein the model number of the alkali liquid flow regulating valve (7) is F101-LP 1.
8. The ethylene glycol rectification corrosion prevention system according to claim 1, wherein the pH analyzer is model 1066-P-HT-60.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122390187.9U CN215962208U (en) | 2021-09-29 | 2021-09-29 | Ethylene glycol rectification anticorrosion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122390187.9U CN215962208U (en) | 2021-09-29 | 2021-09-29 | Ethylene glycol rectification anticorrosion system |
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| Publication Number | Publication Date |
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| CN215962208U true CN215962208U (en) | 2022-03-08 |
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| CN202122390187.9U Active CN215962208U (en) | 2021-09-29 | 2021-09-29 | Ethylene glycol rectification anticorrosion system |
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2021
- 2021-09-29 CN CN202122390187.9U patent/CN215962208U/en active Active
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