CN114949905A - Device and method for recovering methanol in methanol rectification non-condensable gas - Google Patents
Device and method for recovering methanol in methanol rectification non-condensable gas Download PDFInfo
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- CN114949905A CN114949905A CN202210687645.1A CN202210687645A CN114949905A CN 114949905 A CN114949905 A CN 114949905A CN 202210687645 A CN202210687645 A CN 202210687645A CN 114949905 A CN114949905 A CN 114949905A
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- Prior art keywords
- methanol
- rectification
- pipe
- tank
- control valve
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 726
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000011084 recovery Methods 0.000 claims abstract description 68
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 60
- 239000007789 gas Substances 0.000 claims abstract description 60
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 19
- 230000005494 condensation Effects 0.000 abstract 1
- 238000009833 condensation Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000009835 boiling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
- B01D5/0033—Other features
- B01D5/0051—Regulation processes; Control systems, e.g. valves
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
- C07C29/80—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by distillation
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a device and a method for recovering methanol in methanol rectification non-condensable gas, wherein a methanol rectification discharge tank (5) is connected with a methanol rectification non-condensable gas discharge pipe (6), the methanol rectification non-condensable gas discharge pipe (6) is connected with an ammonia torch main pipe (21) and a tail gas blow-down pipe (19), and the other end of a methanol recovery condensation pipe (7) is connected with a methanol recovery tank (2); the methanol recovery tank (2) is connected with the methanol rectification underground tank (3) through a methanol recovery tank bottom pipe (8); a methanol rectification underground tank pump (4) is arranged between the methanol rectification underground tank (3) and the methanol rectification pre-rectifying tower (1); an outlet pipe (9) of the underground tank pump is connected to a methanol rectification raw material pipe (10), and the methanol rectification raw material pipe (10) is connected to a methanol rectification pre-rectifying tower (1); the methanol recovery tank (2) is connected with a low-pressure nitrogen pipe (11). The invention can recover the methanol condensed in the non-condensable gas discharge pipe, improves the quality of the refined methanol and ensures the stable operation of the ammonia torch pipe network.
Description
Technical Field
The invention relates to the technical field of methanol rectification, in particular to a device for recovering methanol in methanol-rectified non-condensable gas, and also relates to a method for recovering methanol in methanol-rectified non-condensable gas.
Background
The crude methanol contains many kinds of impurities, and in order to prepare qualified refined methanol products, the impurities must be removed, and a multi-tower rectification method is generally adopted. The company adopts a 3+1 tower, namely a four-tower rectification process. Heating the crude methanol, then feeding the heated crude methanol into a pre-rectifying tower to remove dissolved gas and low-boiling point impurities, and then removing water and high-boiling point impurities in a pressurized rectifying tower and a normal-pressure rectifying tower to obtain qualified refined methanol products, wherein a small amount of methanol and the like in the wastewater are recovered through a methanol recovery tower.
In the process of producing refined methanol, the pre-rectifying tower continuously discharges non-condensable gas dissolved in crude methanol to an ammonia flare pipe network through a discharge pipe, and the non-condensable gas contains CO 2 、H 2 、CH 3 OH, and the like. Because of the overlong discharge pipeline, methanol can be condensed and accumulated in the pipeline to generate ammonium bicarbonate crystals, and a low-point pilot valve is blocked, so that the operation of an ammonia flare pipe network is unstable. Meanwhile, methanol is condensed in a pipeline, and a liquid seal is formed, so that noncondensable gas in the pre-rectifying tower is not discharged smoothly, and the quality of a refined methanol product is influenced. It may also cause environmental pollution and even present a safety risk.
Disclosure of Invention
The invention aims to overcome the defects and provide the device for recovering the methanol in the rectified non-condensable gas of the methanol, which can recover the methanol condensed in the non-condensable gas discharge pipe, improve the quality of the refined methanol product and ensure the stable operation of an ammonia torch pipe network.
The invention also aims to provide the method for recovering the methanol in the rectified noncondensable gas of the methanol.
The technical scheme of the invention is as follows:
the device for recovering the methanol in the methanol rectification non-condensable gas comprises a methanol rectification pre-rectifying tower, a methanol recovery tank, a methanol rectification underground tank pump and a methanol rectification discharge tank, wherein: the methanol rectification discharge tank is connected with a methanol rectification noncondensable gas discharge pipe, the methanol rectification noncondensable gas discharge pipe is connected with an ammonia torch main pipe, a blind plate, a gas phase control valve, a tail gas blow-down pipe and a condensed methanol recovery pipe are arranged between the methanol rectification discharge pipe and the ammonia torch main pipe, the other end of the condensed methanol recovery pipe is connected with the methanol recovery tank, and the condensed methanol recovery pipe is provided with a condensed methanol discharge valve; the methanol recovery tank is connected with the methanol rectification underground tank through a bottom pipe of the methanol recovery tank, and a liquid level control valve of the methanol recovery tank is arranged on the bottom pipe of the methanol recovery tank; a methanol rectification underground tank pump is arranged between the methanol rectification underground tank and the methanol rectification pre-rectifying tower; an outlet pipe of the underground tank pump is connected to a methanol rectification raw material pipe, the methanol rectification raw material pipe is connected to a methanol rectification pre-rectifying tower, and a control valve is arranged on the outlet pipe of the underground tank pump; the methanol recovery tank is connected with a low-pressure nitrogen pipe, and the low-pressure nitrogen pipe is provided with a low-pressure nitrogen control valve A and a low-pressure nitrogen control valve B.
Above-mentioned device of retrieving methyl alcohol rectification noncondensable gas, wherein: a methanol rectification raw material control valve is arranged on the methanol rectification raw material pipe.
The invention relates to a method for recovering methanol in methanol rectification non-condensable gas, which comprises the following steps:
(1) the non-condensable gas in the methanol rectification discharge tank is discharged into a tail gas vent pipe through a gas phase control valve and does not enter an ammonia torch pipeline;
(2) continuously discharging the condensed methanol liquid in the tail gas vent pipe into a methanol recovery tank through a condensed methanol discharge valve, closing the condensed methanol discharge valve when the liquid level in the methanol recovery tank rises to 85%, opening a low-pressure nitrogen valve A and a low-pressure nitrogen control valve B, and controlling the pressure of the methanol recovery tank to be 0.1 MPa; opening a liquid level control valve of the methanol recovery tank, discharging the liquid level of the methanol recovery tank to 15%, and closing a low-pressure nitrogen valve A, a low-pressure nitrogen control valve B and the liquid level control valve of the methanol recovery tank;
(3) the condensed methanol enters a methanol recovery tank through a condensed methanol recovery pipe 7, the methanol is discharged into a methanol rectification underground tank by a low-pressure nitrogen pipe connected to the methanol recovery tank by utilizing the pressure difference principle, a methanol rectification underground tank pump is started, the methanol in the methanol rectification underground tank is sent to a methanol rectification raw material pipe, and enters a methanol rectification pre-rectifying tower for rectification, and the methanol is recovered.
Compared with the prior art, the invention has obvious beneficial effects, and the technical scheme can show that: according to the invention, a blind plate partition is arranged before a methanol rectification non-condensable gas discharge pipe enters an ammonia torch main pipe, a tail gas blow-down pipe is added to lift the non-condensable gas to a high position for blowing down, and a condensed methanol recovery pipe is added in front of the blind plate; the condensed methanol enters a methanol recovery tank through a condensed methanol recovery pipe; the methanol recovery tank is provided with a low-pressure nitrogen pipe, and the methanol is discharged into a methanol rectification underground tank by utilizing the pressure difference principle; and the methanol in the methanol rectification underground tank is pumped into a methanol rectification pre-rectifying tower through a methanol rectification underground tank to recover the methanol. The invention can effectively recycle the methanol discharged from the tail gas, change waste into valuable, save energy and reduce consumption. The quality of the refined methanol product is improved, and the stable operation of the ammonia flare pipe network is ensured. Economic benefits are as follows: taking a project of producing 20 ten thousand tons of refined methanol per year as an example, operating the device for 330 days per year, wherein the content of the methanol in the discharged liquid is 85 percent, 660 Kg of methanol is recovered per day, the unit price of the methanol is calculated as 2000 yuan/ton, and the sales income can be increased per year: annual methanol recovery value =330 days × 0.66 tons × 85% × 2000 yuan/ton =370260 yuan. The invention can recycle the methanol in the non-condensable gas to the maximum extent, and simultaneously reduces the safety risk of discharging the methanol into the atmosphere when the non-condensable gas is discharged.
Drawings
FIG. 1 is a schematic view of the present invention.
The labels in the figure are: 1. the system comprises a methanol rectification pre-rectifying tower, 2, a methanol recovery tank, 3, a methanol rectification underground tank, 4, a methanol rectification underground tank pump, 5, a methanol rectification discharge tank, 6, a methanol rectification non-condensable gas discharge pipe, 7, a condensed methanol recovery pipe, 8, a methanol recovery tank bottom pipe, 9, an underground tank pump outlet pipe, 10, a methanol rectification raw material pipe, 11, a low-pressure nitrogen pipe, 12, a low-pressure nitrogen control valve A, 13, a low-pressure nitrogen valve B, 14, a condensed methanol discharge valve, 15, a methanol recovery tank liquid level control valve, 16, a control valve, 17, a methanol rectification raw material control valve, 18, a gas phase control valve, 19, a tail gas vent pipe, 20, a blind plate and 21, an ammonia torch main pipe.
Detailed Description
The following detailed description of the embodiments, structures, features and effects of the apparatus for recovering methanol from methanol-rectified non-condensable gas according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Example 1:
referring to fig. 1, the apparatus for recovering methanol from methanol-rectified non-condensable gas of the present invention comprises a methanol-rectification pre-rectifying tower 1, a methanol-recovery tank 2, a methanol-rectification underground tank 3, a methanol-rectification underground tank pump 4 and a methanol-rectification discharge tank 5, wherein: the methanol rectification discharge tank 5 is connected with a methanol rectification noncondensable gas discharge pipe 6, the methanol rectification noncondensable gas discharge pipe 6 is connected with an ammonia torch main pipe 21, a blind plate 20, a gas phase control valve 18, a tail gas blow-down pipe 19 and a condensed methanol recovery pipe 7 are arranged between the methanol rectification noncondensable gas discharge pipe 6 and the ammonia torch main pipe, the other end of the condensed methanol recovery pipe 7 is connected with the methanol recovery tank 2, and the condensed methanol recovery pipe 7 is provided with a condensed methanol discharge valve 14; the methanol recovery tank 2 is connected with the methanol rectification underground tank 3 through a methanol recovery tank bottom pipe 8, and a methanol recovery tank liquid level control valve 15 is arranged on the methanol recovery tank bottom pipe 8; a methanol rectification underground tank pump 4 is arranged between the methanol rectification underground tank 3 and the methanol rectification pre-rectifying tower 1; an underground tank pump outlet pipe 9 is connected to a methanol rectification raw material pipe 10, the methanol rectification raw material pipe 10 is connected to the methanol rectification pre-rectifying tower 1, a control valve 16 is arranged on the underground tank pump outlet pipe 9, and a methanol rectification raw material control valve 17 is arranged on the methanol rectification raw material pipe 10; the methanol recovery tank 2 is connected with a low-pressure nitrogen pipe 11, and the low-pressure nitrogen pipe 11 is provided with a low-pressure nitrogen control valve A12 and a low-pressure nitrogen control valve B13.
Example 2:
referring to fig. 1, the method for recovering methanol in methanol rectification non-condensable gas of the invention comprises the following steps:
(1) the non-condensable gas in the methanol rectification discharge tank 5 is discharged into a tail gas vent pipe 19 through a gas phase control valve 18 and does not enter an ammonia torch pipeline;
(2, continuously discharging the condensed methanol liquid in the tail gas blow-down pipe 19 into the methanol recovery tank 2 through the condensed methanol discharge valve 14, and when the liquid level in the methanol recovery tank 2 rises to 85%, closing the condensed methanol discharge valve 14, opening the low-pressure nitrogen valve A12 and the low-pressure nitrogen control valve B13, and controlling the pressure of the methanol recovery tank 2 to be 0.1 MPa;
(3 the methanol condensed down enters the methanol recovery tank 2 through the condensed methanol recovery pipe 7, the low-pressure nitrogen pipe 11 connected with the methanol recovery tank 2 discharges the methanol into the methanol rectification underground tank 3 by utilizing the pressure difference principle, the methanol rectification underground tank pump 4 is started, the methanol in the methanol rectification underground tank 3 is sent to the methanol rectification raw material pipe 10, and enters the methanol rectification pre-rectifying tower 1 for rectification, and the methanol is recovered.
Through practical application, the methanol rectifying device can recycle methanol liquid which is originally combusted and discharged or condensed in an ammonia flare pipe network into the methanol rectifying pre-rectifying tower for producing refined methanol. After the application, the methanol rectifying device operates stably, the quality of the refined methanol product is not influenced, the investment cost is low, and the economic benefit is high.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modifications, equivalent variations and modifications made on the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention without departing from the technical solution of the present invention.
Claims (4)
1. The utility model provides a retrieve device of methyl alcohol among methyl alcohol rectification noncondensable gas, includes methyl alcohol rectification pre-rectifying tower (1), methyl alcohol accumulator (2), methyl alcohol rectification underground tank (3), methyl alcohol rectification underground tank pump (4) and methyl alcohol rectification discharge tank (5), its characterized in that: the methanol rectification discharge tank (5) is connected with a methanol rectification noncondensable gas discharge pipe (6), the methanol rectification noncondensable gas discharge pipe (6) is connected to an ammonia torch main pipe (21), a blind plate (20), a gas phase control valve (18), a tail gas blow-down pipe (19) and a condensed methanol recovery pipe (7) are arranged between the methanol rectification noncondensable gas discharge pipe and the ammonia torch main pipe, and the other end of the condensed methanol recovery pipe (7) is connected to the methanol recovery tank (2); the methanol recovery tank (2) is connected with the methanol rectification underground tank (3) through a methanol recovery tank bottom pipe (8), and a methanol recovery tank liquid level control valve (15) is arranged on the methanol recovery tank bottom pipe (8); a methanol rectification underground tank pump (4) is arranged between the methanol rectification underground tank (3) and the methanol rectification pre-rectifying tower (1); an outlet pipe (9) of the underground tank pump is connected to a methanol rectification raw material pipe (10), the methanol rectification raw material pipe (10) is connected to a methanol rectification pre-rectifying tower (1), and a control valve (16) is arranged on the outlet pipe (9) of the underground tank pump; the methanol recovery tank (2) is connected with a low-pressure nitrogen pipe (11), and the low-pressure nitrogen pipe (11) is provided with a low-pressure nitrogen control valve A (12) and a low-pressure nitrogen control valve B (13).
2. The apparatus for recovering methanol from non-condensable gas by methanol rectification as claimed in claim 1, wherein: and a methanol rectification raw material control valve (17) is arranged on the methanol rectification raw material pipe (10).
3. The apparatus for recovering methanol from non-condensable gas by methanol rectification as claimed in claim 1, wherein: and a condensed methanol discharge valve (14) is arranged on the condensed methanol recovery pipe (7).
4. A method for recovering methanol in methanol rectification non-condensable gas comprises the following steps:
(1) the non-condensable gas in the methanol rectification discharge tank (5) is discharged into a tail gas vent pipe (19) through a gas phase control valve (18) and does not enter an ammonia torch pipeline;
(2) the condensed methanol liquid in the tail gas blow-down pipe (19) is continuously discharged into a methanol recovery tank (2) through a condensed methanol discharge valve (14), when the liquid level in the methanol recovery tank (2) rises to 85%, the condensed methanol discharge valve (14) is closed, a low-pressure nitrogen valve A (12) and a low-pressure nitrogen control valve B (13) are opened, the pressure of the methanol recovery tank (2) is controlled to be 0.1MPa, a methanol recovery tank liquid level control valve (15) is opened, the liquid level of the methanol recovery tank (2) is discharged to 15%, and the low-pressure nitrogen valve A (12), the low-pressure nitrogen control valve B (13) and the methanol recovery tank liquid level control valve (15) are closed;
(3) the condensed methanol enters a methanol recovery tank (2) through a condensed methanol recovery pipe (7), a low-pressure nitrogen pipe (11) connected to the methanol recovery tank (2) discharges the methanol into a methanol rectification underground tank (3) by utilizing the pressure difference principle, a methanol rectification underground tank pump (4) is started, the methanol in the methanol rectification underground tank (3) is sent to a methanol rectification raw material pipe (10), and enters a methanol rectification pre-rectifying tower (1) for rectification to recover the methanol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210687645.1A CN114949905B (en) | 2022-06-17 | 2022-06-17 | Device and method for recycling methanol in methanol rectification non-condensable gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210687645.1A CN114949905B (en) | 2022-06-17 | 2022-06-17 | Device and method for recycling methanol in methanol rectification non-condensable gas |
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| Publication Number | Publication Date |
|---|---|
| CN114949905A true CN114949905A (en) | 2022-08-30 |
| CN114949905B CN114949905B (en) | 2024-04-09 |
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| CN202210687645.1A Active CN114949905B (en) | 2022-06-17 | 2022-06-17 | Device and method for recycling methanol in methanol rectification non-condensable gas |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597462A (en) * | 2016-03-16 | 2016-05-25 | 山东东岳有机硅材料有限公司 | Treatment process for dust-containing tail gas in synthesis and emptying of methyl chlorosilane |
| CN112479821A (en) * | 2020-12-21 | 2021-03-12 | 国家能源集团宁夏煤业有限责任公司 | Method and system for reducing fusel oil production in crude methanol refining process |
| CN213110764U (en) * | 2020-06-30 | 2021-05-04 | 聊城鲁西多元醇新材料科技有限公司 | Low boiling point material storage system |
| RU2750696C1 (en) * | 2020-06-26 | 2021-07-01 | Общество С Ограниченной Ответственностью "Газпром Трансгаз Краснодар" | Adsorption unit for preparation of natural gas |
| CN217448995U (en) * | 2022-06-17 | 2022-09-20 | 贵州天福化工有限责任公司 | Device for recovering methanol in methanol rectification noncondensable gas |
-
2022
- 2022-06-17 CN CN202210687645.1A patent/CN114949905B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597462A (en) * | 2016-03-16 | 2016-05-25 | 山东东岳有机硅材料有限公司 | Treatment process for dust-containing tail gas in synthesis and emptying of methyl chlorosilane |
| RU2750696C1 (en) * | 2020-06-26 | 2021-07-01 | Общество С Ограниченной Ответственностью "Газпром Трансгаз Краснодар" | Adsorption unit for preparation of natural gas |
| CN213110764U (en) * | 2020-06-30 | 2021-05-04 | 聊城鲁西多元醇新材料科技有限公司 | Low boiling point material storage system |
| CN112479821A (en) * | 2020-12-21 | 2021-03-12 | 国家能源集团宁夏煤业有限责任公司 | Method and system for reducing fusel oil production in crude methanol refining process |
| CN217448995U (en) * | 2022-06-17 | 2022-09-20 | 贵州天福化工有限责任公司 | Device for recovering methanol in methanol rectification noncondensable gas |
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