CN220328620U - Nitric acid recovery system in coal-to-ethylene glycol production - Google Patents
Nitric acid recovery system in coal-to-ethylene glycol production Download PDFInfo
- Publication number
- CN220328620U CN220328620U CN202321826104.9U CN202321826104U CN220328620U CN 220328620 U CN220328620 U CN 220328620U CN 202321826104 U CN202321826104 U CN 202321826104U CN 220328620 U CN220328620 U CN 220328620U
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- CN
- China
- Prior art keywords
- nitric acid
- acid recovery
- recovery tower
- pipe
- tower
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 229910017604 nitric acid Inorganic materials 0.000 title claims abstract description 70
- 238000011084 recovery Methods 0.000 title claims abstract description 54
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Substances OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 230000032050 esterification Effects 0.000 claims abstract description 21
- 238000005886 esterification reaction Methods 0.000 claims abstract description 21
- 239000007864 aqueous solution Substances 0.000 claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 9
- KJYQVRBDBPBZTD-UHFFFAOYSA-N methanol;nitric acid Chemical compound OC.O[N+]([O-])=O KJYQVRBDBPBZTD-UHFFFAOYSA-N 0.000 claims abstract description 9
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 42
- 239000000243 solution Substances 0.000 claims description 4
- 210000003437 trachea Anatomy 0.000 claims description 4
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- BLLFVUPNHCTMSV-UHFFFAOYSA-N methyl nitrite Chemical compound CON=O BLLFVUPNHCTMSV-UHFFFAOYSA-N 0.000 description 5
- 239000007791 liquid phase Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a nitric acid recovery system in coal glycol production, which comprises a first nitric acid recovery tower, wherein a nitric acid methanol aqueous solution pipe, an esterification circulating gas pipe, a first exhaust pipe and a liquid discharge pipe are communicated with the first nitric acid recovery tower; the utility model has the beneficial effects that: through the reaction of the first nitric acid recovery tower and the second nitric acid recovery tower, nitric acid contained in the esterification tower kettle liquid is effectively converted and recovered, so that the damage to pipelines and equipment caused by the nitric acid entering a subsequent process system is avoided, and the normal and safe operation of the subsequent system is ensured.
Description
Technical field:
the utility model belongs to the field of chemical industry, and particularly relates to a nitric acid recovery system in the production of coal-to-ethylene glycol.
The background technology is as follows:
in the production process of the coal glycol, the content of byproduct nitric acid contained in the esterification tower kettle liquid (containing nitric acid methanol aqueous solution) is up to 2.8-3.8% (wt), and nitric acid is an inorganic strong acid and has very strong corrosiveness on steel pipelines and equipment, so that the esterification tower kettle liquid can be normally sent to subsequent processes after the nitric acid in the methanol aqueous solution is treated; in the prior art, a nitric acid recovery tower is generally used for nitric acid recovery, a nitric acid methanol aqueous solution contained in the nitric acid recovery tower reacts with esterification recycle gas rich in nitric oxide to generate methyl nitrite, and finally the methyl nitrite escapes from the tower top to enter a subsequent system, and in the process, the nitric acid recovery rate gradually drops to about 85% along with gradual loss of a filler in the nitric acid recovery tower, so that partial nitric acid cannot be recovered in time, and along with the methanol aqueous solution, a pipeline of subsequent process equipment still can be corroded and destroyed by nitric acid, and the normal and safe operation of the subsequent system is influenced.
The utility model comprises the following steps:
the utility model aims to provide a nitric acid recovery system in the production of coal glycol, overcomes the defects of the prior art, and effectively solves the existing problem of low separation efficiency.
The utility model comprises the following steps: the utility model provides a nitric acid recovery system in coal glycol production, includes first nitric acid recovery tower communicate on the first nitric acid recovery tower has nitric acid methyl alcohol aqueous solution pipe, esterification circulation trachea, first blast pipe, fluid-discharge tube, the fluid-discharge tube is linked together with the second nitric acid recovery tower communicate on the second nitric acid recovery tower has second blast pipe, methyl alcohol aqueous solution pipe communicate on the esterification circulation trachea has esterification circulation bypass, esterification circulation bypass with the second nitric acid recovery tower is linked together.
Further, a short circuit pipeline is communicated between the nitric acid methanol water solution pipe and the methanol water solution pipe, and an interlocking automatic cut-off valve is arranged on the short circuit pipeline.
Further, a first tower kettle pump is arranged on the liquid discharge pipe.
Further, a standby bypass is communicated with the liquid discharge pipe, and a second tower kettle pump is arranged on the standby bypass.
Further, liquid level meters are arranged on the first nitric acid recovery tower and the second nitric acid recovery tower.
The utility model has the beneficial effects that: through the reaction of the first nitric acid recovery tower and the second nitric acid recovery tower, nitric acid contained in the esterification tower kettle liquid is effectively converted and recovered, so that the damage to pipelines and equipment caused by the nitric acid entering a subsequent process system is avoided, and the normal and safe operation of the subsequent system is ensured.
Description of the drawings:
FIG. 1 is a system view of the present utility model;
in the figure, a first nitric acid recovery tower, a 2 nitric acid methanol aqueous solution pipe, a 3 esterification circulation gas pipe, a 4 first exhaust pipe, a 5 liquid discharge pipe, a 6 second nitric acid recovery tower, a 7 second exhaust pipe, an 8 methanol aqueous solution pipe, a 9 esterification circulation bypass, a 10 short circuit pipeline and a 11 standby bypass are arranged.
The specific embodiment is as follows:
for a clearer understanding of technical features, objects, and effects of the present utility model, a specific embodiment of the present utility model will be described with reference to the accompanying drawings:
as shown in fig. 1, the nitric acid recovery system in the production of coal-to-ethylene glycol comprises a first nitric acid recovery tower 1, wherein a nitric acid methanol aqueous solution pipe 2, an esterification circulation air pipe 3, a first exhaust pipe 4 and a liquid discharge pipe 5 are communicated with the first nitric acid recovery tower 1, the liquid discharge pipe 5 is communicated with a second nitric acid recovery tower 6, a second exhaust pipe 7 and a methanol aqueous solution pipe 8 are communicated with the second nitric acid recovery tower 6, an esterification circulation bypass 9 is communicated with the esterification circulation air pipe 3, the esterification circulation bypass 9 is communicated with the second nitric acid recovery tower 6, a short circuit pipeline 10 is communicated between the nitric acid methanol aqueous solution pipe 2 and the methanol aqueous solution pipe 8, an automatic interlocking shut-off valve is arranged on the short circuit pipeline 10, a first tower kettle pump is arranged on the liquid discharge pipe 5, a standby bypass 11 is arranged on the liquid discharge pipe 5, and liquid level gauges are arranged on the first nitric acid recovery tower 1 and the second nitric acid recovery tower 6.
Specifically, through the reaction of the first nitric acid recovery tower 1 and the second nitric acid recovery tower 6, nitric acid is effectively recovered, and damage to pipelines and equipment caused by the fact that nitric acid enters a subsequent process system is avoided.
In the actual use process, the liquid in the pipe is conveyed into the first nitric acid recovery tower 1 by the nitric acid methanol aqueous solution pipe 2, the gas in the pipe is conveyed into the first nitric acid recovery tower 1 by the esterification circulating gas pipe 3, in the process of liquid phase falling and gas phase rising in the first nitric acid recovery tower 1, the chemical reaction of methanol, nitric acid and nitric oxide contained in the gas phase occurs on the surface of a packing layer, the nitric acid contained in the liquid phase is converted into intermediate raw material methyl nitrite required by the subsequent reaction, the generated methyl nitrite escapes and is recovered from the first exhaust pipe 4, the residual methanol and a small amount of nitric acid mixed liquid enter the second nitric acid recovery tower 6 through the liquid discharge pipe 5 under the pressurization of the first tower kettle pump, the nitric acid and nitric oxide react again in the second nitric acid recovery tower 6 to generate methyl nitrite and finally escape and are recovered through the second exhaust pipe 7, and the final methanol liquid is conveyed to a downstream methanol recovery system through the methanol aqueous solution pipe 8; the short circuit pipeline 10 and the standby bypass 11 are used for normally circulating liquid in the pipeline in the process of pipeline blockage or shutdown of the system in the operation process, so that the system is convenient to overhaul.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. A nitric acid recovery system in coal glycol production is characterized in that: including first nitric acid recovery tower (1) communicate on first nitric acid recovery tower (1) has nitric acid methyl alcohol aqueous solution pipe (2), esterification circulation trachea (3), first blast pipe (4), fluid-discharge tube (5) are linked together with second nitric acid recovery tower (6) communicate on second nitric acid recovery tower (6) have second blast pipe (7), methyl alcohol aqueous solution pipe (8) the last intercommunication of esterification circulation trachea (3) has esterification circulation bypass (9), esterification circulation bypass (9) with second nitric acid recovery tower (6) are linked together.
2. The nitric acid recovery system in the production of coal-derived ethylene glycol according to claim 1, wherein: a short-circuit pipeline (10) is communicated between the nitric acid methanol water solution pipe (2) and the methanol water solution pipe (8), and an interlocking automatic cut-off valve is arranged on the short-circuit pipeline (10).
3. The nitric acid recovery system in the production of coal-derived ethylene glycol according to claim 1, wherein: a first tower kettle pump is arranged on the liquid discharge pipe (5).
4. A nitric acid recovery system in the production of coal derived ethylene glycol according to claim 3, wherein: a standby bypass (11) is communicated with the liquid discharge pipe (5), and a second tower kettle pump is arranged on the standby bypass (11).
5. The nitric acid recovery system in the production of coal-derived ethylene glycol according to claim 1, wherein: and liquid level meters are arranged on the first nitric acid recovery tower (1) and the second nitric acid recovery tower (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321826104.9U CN220328620U (en) | 2023-07-12 | 2023-07-12 | Nitric acid recovery system in coal-to-ethylene glycol production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321826104.9U CN220328620U (en) | 2023-07-12 | 2023-07-12 | Nitric acid recovery system in coal-to-ethylene glycol production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220328620U true CN220328620U (en) | 2024-01-12 |
Family
ID=89459273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321826104.9U Active CN220328620U (en) | 2023-07-12 | 2023-07-12 | Nitric acid recovery system in coal-to-ethylene glycol production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220328620U (en) |
-
2023
- 2023-07-12 CN CN202321826104.9U patent/CN220328620U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 017418 west side of Yili Road, duguitala Town, Hangjin Banner, Ordos City, Inner Mongolia Autonomous Region Patentee after: Ordos Xinrun Energy Co.,Ltd. Country or region after: China Address before: 017418 west side of Yili Road, duguitala Town, Hangjin Banner, Ordos City, Inner Mongolia Autonomous Region Patentee before: ORDOS CITY XINHANG ENERGY CO.,LTD. Country or region before: China |