CN106478370A - A kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases - Google Patents
A kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases Download PDFInfo
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- CN106478370A CN106478370A CN201610888621.7A CN201610888621A CN106478370A CN 106478370 A CN106478370 A CN 106478370A CN 201610888621 A CN201610888621 A CN 201610888621A CN 106478370 A CN106478370 A CN 106478370A
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- 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
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- 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
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- 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
- C07C29/86—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment by liquid-liquid treatment
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases, using periodic off-gases scrubbing tower and pre-tower backflash, the pre-tower top gas of rectification section are passed through condensed in two stages, then condensed light component periodic off-gases is led to periodic off-gases scrubbing tower；Be passed through deionized water extracting and washing is circulated as extracting and washing agent, and in tower reactor section using centrifugation and gravity from seprating assistant equipment and the flow process of dividing plate standing extract and separate light oil and methyl alcohol.The method is both the method for extraction and recovery methyl alcohol, while also solving the problems, such as fixed gas discharge after the raising of current environmental protection standard, concise in technology, equipment investment are few, easy to operate.
Description
Technical field
The present invention relates to Methanol Recovery method field in methanol rectification periodic off-gases, specifically a kind of improved methanol rectification is speeded
The method for reclaiming methyl alcohol in deflation.
Background technology
New《Oil and chemical pollutant discharge standard》In GB31571-2015, the row of organic pollution in waste gas discharge
Put restriction more strict, wherein methyl alcohol is 50mg/m3.And the organic matter such as methyl alcohol in the discharge capacity of the light component of conventional methanol rectification
The numerical value has been far longer than！The requirement of currently newest discharge standard can not have been met.Technology upgrading is forced in environmental protection, is carved
Do not allow to delay！Current China has been built up in the methanol device of operation or hot work in progress, and the flow process for processing light component mainly has
Several configuration modes as follows：1st, 300,000 tons/year and its following methanol device generally use the backflash of pre-tower while as being
Light oil extraction equipment, carries out extract and separate from the side of equipment and goes out light oil constituents directly as accessory substance isobutyl base oil；2nd, 600,000
Ton/year and its flow process of above production capacity be divided into two kinds of flow processs again, one of which be configured for the washing of periodic off-gases scrubbing tower, lazy
Property the light-component gas such as gas discharge from tower top, remaining methyl alcohol, water and light oil part all produce from tower reactor and enter pre-tower backflash
Extract and separate light oil phase being carried out with desalted water, and final methanol aqueous solution entering pre-tower backflow, light oil part is set from two respectively
Standby middle extraction is used as accessory substance；Another be from discharging methyl alcohol, water and light oil part that gas wash tower gets off while setting to two
Standby：Pre-tower backflash and outer circulation resolver is respectively enterd, other flow processs are identical.
Current above two flow process is that light component separates the most frequently used technological process, and has been developed as the work of main flow
Skill technology.The technological process also experienced the exploitation of several generations and development, several times modification and perfection；However, increasingly severeer air,
The environmental issues such as water pollution, we have proposed new requirement again.And, whole country is all changing now, each row
Industry is all in transition and upgrade.Chemical industry and more should so.Two big keyword " production capacity surpluses " and " environmental pollution " seem all to focus on
Point to chemical industry this " arch-criminal ".From in terms of long term growth, industry and technology upgrading are inexorable trends.
Concentrate on and in methanol rectification technique, occur in that following several different flow processs：
CASALE [P] reports a kind of method of methanol rectification：Set using periodic off-gases scrubbing tower and pre-tower backflash two
Back-up does not produce the components such as the organic acid that the mode of light oil part is removed in periodic off-gases and methyl alcohol, and remaining is based on CO2
Light-component gas are arranged to torch.
TOPSOE [P] is similar to also disclose that a kind of methanol rectification technique, and they are also separated using periodic off-gases scrubbing tower
Organic principle in light component, but the spe medium for except for the difference that adopting be rectifying column internal come wastewater of rectification, scrubbing tower bottom
The solution in portion enters a crude glycol tank and then is returning pre-rectifying tower with pump.
In the disclosed methanol rectification flow process of University Of Tianjin Zhang Pengfei professor, come using scrubbing tower and outer circulation resolver respectively
Extracting and washing reclaims the technological process of methyl alcohol.
The premise that the present invention is maximized based on current Coal Chemical Industry, still selects periodic off-gases scrubbing tower right as mainly studying
As carrying out new technological process.The present invention has carried out analog study in large quantities to the various technological parameters of extraction process, to upper existing
Technology is had to be improved：Outer circulation resolver is eliminated, simplifies the structure of pre-tower backflash；More importantly improve and wash
Wash the internal structure of tower and optimize separation and the recovery process of whole light component.
Content of the invention
It is an object of the invention to provide a kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases, makes methanol rectification
Methanol content in the light-component gas that pre- top of tower is discharged meets the requirement of new discharge standard GB31571-2015.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases, it is characterised in that：Comprise the following steps：
(1), the crude carbinol for exporting methanol-fueled CLC workshop section in advance is got in pre-rectifying tower, and sets up one in pre-rectifying tower
Fixed crude carbinol liquid level, the scope of crude carbinol liquid level is the 40～75% of pre-rectifying tower tower reactor level gauge journey, using pre- rectifying
Crude carbinol initial gross separation is gone out tower the light component periodic off-gases containing certain methanol content；
(2), the light component periodic off-gases in step (1) are passed sequentially through condensed in two stages device, using condensed in two stages, isolates light
The first alcohol and water of the overwhelming majority in component periodic off-gases, the condensation temperature of wherein first order condenser are set as 50～70 DEG C, second
The condensation temperature of level condenser is set as 40～60 DEG C；
(3), using desalted water as washing and extractant, desalted water is squeezed into periodic off-gases with the flow velocity of 0.5～3m/s and is washed
Tower inner top is washed, and low-pressure steam condensate liquid is passed through to periodic off-gases scrubbing tower inner top when being normally operation, and is washed in periodic off-gases
Certain liquid level is set up in tower, and the scope of liquid level is the 5～70% of periodic off-gases scrubbing tower tower reactor level gauge journey；
Remaining light component periodic off-gases after step (2) condensed in two stages are passed through periodic off-gases scrubbing tower, are carried out using desalted water
Wash and extract, and adopt the realization backflow of pressurized circulation pump to wash, make remaining light component periodic off-gases scrubbed and divide after extracting
Separating out fixed gas, light oil phase, water and methyl alcohol phase, the operation temperature of scrubbing tower is 30～60 DEG C, operating pressure is 0.001～
0.1MPa；Wherein fixed gas is arranged by the tower top of periodic off-gases scrubbing tower and is processed to external exhaust gas bleed-off system, light oil phase, Shui Hejia
In periodic off-gases scrubbing tower inner bottom part stratification, the light oil on upper strata can pass through periodic off-gases scrubbing tower after mutually reaching certain liquid level to alcohol phase
Side take-off is used as isobutyl base oil product, and lower floor's water and methyl alcohol phase then continue through weight and flow automatically from periodic off-gases wash tower bottoms
Go out, and circulating reflux participates in separating further to pre-rectifying tower.
The method for reclaiming methyl alcohol in described a kind of improved methanol rectification periodic off-gases, it is characterised in that：Wash in periodic off-gases
Wash in tower and separating effect is optimized using multistage structured packing.
The method for reclaiming methyl alcohol in described a kind of improved methanol rectification periodic off-gases, it is characterised in that：Wash in periodic off-gases
Wash using 1～3 set of gravity centrifugal separating device in tower, for the effect of Optimized Extraction.
The method for reclaiming methyl alcohol in described a kind of improved methanol rectification periodic off-gases, it is characterised in that：Wash in periodic off-gases
Wash tower reactor section in tower and decker is isolated using an extract and separate with 1～10 air valve.
The method for reclaiming methyl alcohol in described a kind of improved methanol rectification periodic off-gases, it is characterised in that：Wash in periodic off-gases
Wash tower and pre-tower backflash is externally provided with, pre-tower backflash is connected by pressurized circulation pump, pipeline and backflow realized by periodic off-gases scrubbing tower
Washing, periodic off-gases scrubbing tower arrange high 8～20 meters than pre-tower backflash.
The method for reclaiming methyl alcohol in described a kind of improved methanol rectification periodic off-gases, it is characterised in that：Periodic off-gases are washed
Fluid level control valve is provided with pipeline between tower and pre-tower backflash, periodic off-gases scrubbing tower tower reactor liquid level is made by fluid level control valve
Scope control about 30～70%.
The method for reclaiming methyl alcohol in described a kind of improved methanol rectification periodic off-gases, it is characterised in that：Periodic off-gases are washed
Tower side line is provided with 1～5 light oil extraction mouth.
Compared with the prior art, beneficial effects of the present invention are embodied in：
(1), the present invention enriches methanol rectification light component and drops a hint and reclaims the technological process of methyl alcohol, it is achieved that a kind of new
Handling process, compared with other two kinds recovery methyl alcohol flow processs, saves outer circulation resolver, and investment is reduced；By directly washing
Wash tower bottom extraction light oil so that internal circulating load greatly reduces, energy-saving, is a kind of more environmentally friendly technological process；In addition it is not required to
Extractant to be increased newly, and due to improving the structure of scrubbing tower so that washing operation is flexible, easy to operate；
(2), the present invention is the process modification optimized based on periodic off-gases structure of column scrubber, retains and improves this and mainly set
Standby, it is proposed that the washing of a kind of new internals of new use and centrifugal extraction equipment and extraction thinking, solve this traditional
Periodic off-gases are containing the excessive old problem of methyl alcohol.Methyl alcohol is a kind of flammable noxious material, if long-term discharge beyond standards, more than certain than
Example, not only will form pollution, and form very big potential safety hazard to air.The present invention this dangerous medium, with one kind
New optimization washing extraction process is transformed into the final products of production, it may be said that be to turn waste into wealth.
Description of the drawings
Fig. 1 is the inventive method systematic procedure figure.
Specific embodiment
As shown in figure 1, a kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases, comprises the following steps：
(1), the crude carbinol for exporting methanol-fueled CLC workshop section in advance is got in pre-rectifying tower 1, and sets up in pre-rectifying tower 1
Certain crude carbinol liquid level, the scope of crude carbinol liquid level is the 40～75% of pre-rectifying tower tower reactor liquid level, using pre- rectifying
Crude carbinol initial gross separation is gone out tower 1 the light component periodic off-gases containing certain methanol content；
(2), the light component periodic off-gases in step (1) are passed sequentially through condensed in two stages device 2,3, using condensed in two stages, separates
Go out the first alcohol and water of the overwhelming majority in light component periodic off-gases, the condensation temperature of wherein first order condenser 2 is set as 50～70 DEG C,
The condensation temperature of second level condenser 3 is set as 40～60 DEG C；
(3), using desalted water as washing and extractant, desalted water is squeezed into periodic off-gases with the flow velocity of 0.5～3m/s and is washed
4 inner top of tower is washed, and low-pressure steam condensate liquid is passed through to 4 inner top of periodic off-gases scrubbing tower during normal operation, and is washed in periodic off-gases
Certain liquid level is set up in tower 4, and the scope of liquid level is the 5～70% of periodic off-gases scrubbing tower tower reactor level gauge journey height；
Remaining light component periodic off-gases after step (2) condensed in two stages are passed through periodic off-gases scrubbing tower 4, are carried out using desalted water
Wash and extract, and adopt the realization backflow of pressurized circulation pump to wash, make remaining light component periodic off-gases scrubbed and divide after extracting
Fixed gas, light oil phase, water and methyl alcohol phase is separated out, the operation temperature of periodic off-gases scrubbing tower 4 is 30～60 DEG C, and operating pressure is
0.001～0.1MPa；Wherein fixed gas is arranged by the tower top of periodic off-gases scrubbing tower 4 and is processed to external exhaust gas bleed-off system, light oil
, in 4 inner bottom part stratification of periodic off-gases scrubbing tower, the light oil on upper strata can be by speeding after mutually reaching certain liquid level for phase, water and methyl alcohol
4 side take-off of deflation scrubbing tower is used as isobutyl base oil product, and lower floor's water and methyl alcohol phase then continue through weight and wash from periodic off-gases
4 bottom of tower is washed from outflow, and circulating reflux participates in separating further to pre-rectifying tower 1.
Separating effect is optimized using multistage structured packing in periodic off-gases scrubbing tower 4.
1～3 set of gravity centrifugal separating device is adopted in periodic off-gases scrubbing tower 4, for the effect of Optimized Extraction.
Tower reactor section isolates decker using an extract and separate with 1～10 air valve in the periodic off-gases scrubbing tower 4.
Pre-tower backflash is externally provided with periodic off-gases scrubbing tower 4, pre-tower backflash is connected by pressurized circulation pump, pipeline and is speeded
Backflow washing realized by deflation scrubbing tower, and periodic off-gases scrubbing tower arranges high 8～20 meters than pre-tower backflash.
Fluid level control valve is provided with pipeline between periodic off-gases scrubbing tower 4 and pre-tower backflash, is made by fluid level control valve
The scope control of periodic off-gases scrubbing tower tower reactor level gauge journey is about 30～70%.
4 side line of periodic off-gases scrubbing tower is provided with 1～5 light oil extraction mouth.
Specific embodiment：
As Fig. 1, first pass through the crude carbinol come by methanol-fueled CLC workshop section and be preheating to after about 72 DEG C pre-rectifying tower is driven into, transmission
Before, first the reboiler shell side of pre-rectifying tower bottom being passed through the steam of 0.5MPaG, main purpose is：Steaming is provided to pre-rectifying tower
Heat and the pressure and temperature for adjusting pre-rectifying tower of crude carbinol is evaporated, then crude carbinol is input into come, to liquid level 50
～90% or so, then with steam-heated evaporator to about 50～100 DEG C, now pressure is in 1bar or so.The pressure of evaporimeter,
Temperature and liquid level are automatically adjusted by teletransmission DCS system.In addition, pre-rectifying tower equipped with：Safety relief device (PSV), liquid level and
Pressure interlock system (interlock) and dump system (ESD).Start Steam reboiler, when technological parameter reaches setting
After value, the condensed in two stages device at pre-rectifying tower top is initially located in condensation separation state, and about 5～10% overhead vapours pass through two
Periodic off-gases scrubbing tower is entered after level condenser.
Before light component periodic off-gases are transferred to periodic off-gases scrubbing tower, first the desalination deionized water of corresponding proportion should be passed through which
In, then periodic off-gases scrubbing tower is come in, and now the pressure of periodic off-gases scrubbing tower is 0.1bar or so, and temperature is 50 DEG C, periodic off-gases
The pressure of scrubbing tower is controlled using the pressure-regulating valve on top gaseous phase pipeline, it is ensured which is in normal range of operation.
Using desalination deionized water as extractant, the process 500～8000kg/h of flow of light component periodic off-gases, and desalination
The flow of deionized water mutually should be：200～3000kg/h.
As a result：
The present invention is disposed with sampler on the outlet line at scrubbing tower top, and analysis draws the laboratory report of table 1.
The analysis report of 1. periodic off-gases scrubbing tower top light-component gas of table
Can draw from analysis report result：The improvement of structure of column scrubber and the optimization of flow process greatly increase methyl alcohol
The rate of recovery, compares with the methanol content of former flow process, not only methyl alcohol but also organic acid and other polyalcohol rate of recovery all phases
Should ground minimizing.It is further seen that lighter part (H2, CO and CO2 etc.) in fixed gas all there is no change, this is main
It is because that they are very low with respect to methyl alcohol, water and other restructuring saturation temperatures of grading, and are all easily separated, to them before and after transformation
Impact is little, and water, methyl alcohol and other organic matter boiling points are close, it is easy to form azeotropic mixture, it is difficult to only one of which be divided completely
From.
Claims (7)
1. a kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases, it is characterised in that：Comprise the following steps：
（1）, the crude carbinol that in advance exports methanol-fueled CLC workshop section gets in pre-rectifying tower, and sets up in pre-rectifying tower certain
Crude carbinol liquid level, the scope of crude carbinol liquid level is the 40～75% of pre-rectifying tower tower reactor level gauge journey height, using pre-rectifying tower
Crude carbinol initial gross separation is gone out the light component periodic off-gases containing certain methanol content；
（2）, by step（1）In light component periodic off-gases pass sequentially through condensed in two stages device, using condensed in two stages, isolate light component
The first alcohol and water of the overwhelming majority in periodic off-gases, the condensation temperature of wherein first order condenser are set as 50～70 DEG C, and the second level is cold
The condensation temperature of condenser is set as 40～60 DEG C；
（3）, using desalted water as washing and extractant, desalted water is squeezed into periodic off-gases scrubbing tower with the flow velocity of 0.5～3m/s
Inner top, is passed through low-pressure steam condensate liquid to periodic off-gases scrubbing tower inner top during normal operation, and built-in in periodic off-gases scrubbing tower
Vertical certain liquid level, the scope of liquid level is the 5～70% of periodic off-gases scrubbing tower tower reactor level gauge journey height；
By step（2）After condensed in two stages, remaining light component periodic off-gases are passed through periodic off-gases scrubbing tower, are washed using desalted water
And extraction, and adopt pressurized circulation pump to realize backflow washing, make remaining light component periodic off-gases scrubbed and isolate after extracting
Fixed gas, light oil phase, water and methyl alcohol phase, the operation temperature of scrubbing tower is 30～60 DEG C, and operating pressure is 0.001～0.1MPa；
Wherein fixed gas is arranged by the tower top of periodic off-gases scrubbing tower and is processed to external exhaust gas bleed-off system, and light oil phase, water and methyl alcohol exist
Periodic off-gases scrubbing tower inner bottom part stratification, the light oil on upper strata can be adopted by periodic off-gases scrubbing tower side line after mutually reaching certain liquid level
Go out as isobutyl base oil product, and lower floor's water and methyl alcohol phase then continue through weight from periodic off-gases wash tower bottoms from outflow, and
Circulating reflux participates in separating further to pre-rectifying tower.
2. the method for reclaiming methyl alcohol in a kind of improved methanol rectification periodic off-gases according to claim 1, it is characterised in that：
Separating effect is optimized using multistage structured packing in periodic off-gases scrubbing tower.
3. the method for reclaiming methyl alcohol in a kind of improved methanol rectification periodic off-gases according to claim 1, it is characterised in that：
1～3 set of gravity centrifugal separating device is adopted in periodic off-gases scrubbing tower, for the effect of Optimized Extraction.
4. the method for reclaiming methyl alcohol in a kind of improved methanol rectification periodic off-gases according to claim 1, it is characterised in that：
Tower reactor section isolates decker using an extract and separate with 1～10 air valve in the periodic off-gases scrubbing tower.
5. the method for reclaiming methyl alcohol in a kind of improved methanol rectification periodic off-gases according to claim 1, it is characterised in that：
Pre-tower backflash is externally provided with periodic off-gases scrubbing tower, pre-tower backflash and periodic off-gases washing are connected by pressurized circulation pump, pipeline
Backflow washing realized by tower, and periodic off-gases scrubbing tower arranges high 8～20 meters than pre-tower backflash.
6. the method for reclaiming methyl alcohol in a kind of improved methanol rectification periodic off-gases according to claim 5, it is characterised in that：
Fluid level control valve is provided with pipeline between periodic off-gases scrubbing tower and pre-tower backflash, washs periodic off-gases by fluid level control valve
The scope control of the liquid level of tower tower reactor liquid is about 30～70%.
7. the method for reclaiming methyl alcohol in a kind of improved methanol rectification periodic off-gases according to claim 1, it is characterised in that：
Periodic off-gases scrubbing tower side line is provided with 1～5 light oil extraction mouth.
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| CN201610888621.7A CN106478370A (en) | 2016-10-11 | 2016-10-11 | A kind of method for reclaiming methyl alcohol in improved methanol rectification periodic off-gases |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285996A (en) * | 2017-06-20 | 2017-10-24 | 天津渤化永利化工股份有限公司 | A kind of method and device of high efficiente callback methanol rectification waste liquid |
| CN108329192A (en) * | 2018-01-13 | 2018-07-27 | 安徽金禾实业股份有限公司 | In a kind of methanol production in gas recovery crude carbinol method and device |
| CN109134196A (en) * | 2018-07-31 | 2019-01-04 | 东华工程科技股份有限公司 | The system of methanol is recycled in a kind of improved methanol rectification periodic off-gases |
| CN111450571A (en) * | 2020-03-17 | 2020-07-28 | 安徽晋煤中能化工股份有限公司 | System for realizing continuous extraction of methanol oil by double-effect utilization of extraction water |
| CN113717032A (en) * | 2021-09-17 | 2021-11-30 | 天津大学 | Process and device for controlling methanol rectification acid removal and pH value |
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| CN101570466A (en) * | 2009-05-18 | 2009-11-04 | 张君涛 | Multi-effect rectifying process of methanol |
| CN104370697A (en) * | 2014-11-07 | 2015-02-25 | 上海国际化建工程咨询公司 | Flexible methanol rectification method and device capable of producing both MTO-grade and AA-grade methanol |
| CN204490765U (en) * | 2014-11-07 | 2015-07-22 | 上海国际化建工程咨询公司 | Not only can produce MTO level but also the mobile type methanol rectifying system of AA level methyl alcohol can have been produced |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101570466A (en) * | 2009-05-18 | 2009-11-04 | 张君涛 | Multi-effect rectifying process of methanol |
| CN104370697A (en) * | 2014-11-07 | 2015-02-25 | 上海国际化建工程咨询公司 | Flexible methanol rectification method and device capable of producing both MTO-grade and AA-grade methanol |
| CN204490765U (en) * | 2014-11-07 | 2015-07-22 | 上海国际化建工程咨询公司 | Not only can produce MTO level but also the mobile type methanol rectifying system of AA level methyl alcohol can have been produced |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285996A (en) * | 2017-06-20 | 2017-10-24 | 天津渤化永利化工股份有限公司 | A kind of method and device of high efficiente callback methanol rectification waste liquid |
| CN108329192A (en) * | 2018-01-13 | 2018-07-27 | 安徽金禾实业股份有限公司 | In a kind of methanol production in gas recovery crude carbinol method and device |
| CN109134196A (en) * | 2018-07-31 | 2019-01-04 | 东华工程科技股份有限公司 | The system of methanol is recycled in a kind of improved methanol rectification periodic off-gases |
| CN109134196B (en) * | 2018-07-31 | 2021-05-11 | 东华工程科技股份有限公司 | System for retrieve methyl alcohol in modified methyl alcohol rectification purge gas |
| CN111450571A (en) * | 2020-03-17 | 2020-07-28 | 安徽晋煤中能化工股份有限公司 | System for realizing continuous extraction of methanol oil by double-effect utilization of extraction water |
| CN113717032A (en) * | 2021-09-17 | 2021-11-30 | 天津大学 | Process and device for controlling methanol rectification acid removal and pH value |
| CN113717032B (en) * | 2021-09-17 | 2024-03-01 | 天津大学 | Process and device for controlling methanol rectifying acid removal and PH value |
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Application publication date: 20170308 |