CN1351000A - Process for recovering methanol from circulating gas in methanol synthesizing procedure - Google Patents
Process for recovering methanol from circulating gas in methanol synthesizing procedure Download PDFInfo
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- CN1351000A CN1351000A CN 00120527 CN00120527A CN1351000A CN 1351000 A CN1351000 A CN 1351000A CN 00120527 CN00120527 CN 00120527 CN 00120527 A CN00120527 A CN 00120527A CN 1351000 A CN1351000 A CN 1351000A
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- methanol
- methyl alcohol
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- circulation gas
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Abstract
A process for recovering methanol from the circulating gas in procedure of synthesizing methanol includes such steps as cooling said circulating gas to 10-12 deg.C, separating out the condensed methanol and water, and mixing the residual gas with fresh synthetic gas for using them in the synthesizing system of methanol.
Description
What the present invention relates to is a kind of method that is reclaimed methyl alcohol in the methyl alcohol building-up process by circulation gas, to improve the methanol output of methanol synthesizing process.This method both can with the supporting use of newly-built methanol device, also can be used for building that system for methanol synthesis is transformed and perfect.
Generating with carbon monoxide, carbonic acid gas and H-H reaction in the building-up process of methyl alcohol, be subjected to the restriction of thermodynamics and kinetic factor, the methanol content that goes out in the synthetic tower gas is synthesizing under the certain situation of operating mode, though have fluctuation within a narrow range, but under normal production conditions, the total amount of methyl alcohol is substantially in the scope of certain value in the exhaust gas body.For the production capacity of methanol of synthesis system, calculate with the difference of methyl alcohol total amount in methyl alcohol total amount in the exhaust gas body in the unit time and the inlet tower gas body usually.Exhaust gas body methyl alcohol total amount is under the situation of certain value substantially under normal production conditions, if can reduce the methyl alcohol total amount in the inlet tower gas body, the then corresponding throughput that can improve methyl alcohol synthetic reactor that means.On the other hand, under certain temperature condition, in the biphasic system that is made of synthetic cyclic gas and thick methyl alcohol in the thick methanol separator, the methanol content in the gas also is certain value substantially.Be to reduce the content of methyl alcohol in the circulation gas, what adopt in the existing full scale plant is the method for high-pressure washing, the characteristic of utilizing methyl alcohol and water to dissolve each other fully, and the content of using methyl alcohol in the circulation gas of water wash column reduces to～and 0.15%.But adopt the equipment manufacturing cost height of this method, the flow process complexity, operation is difficulty, and washing produced is that a large amount of concentration only are 30% dilute methanol solution, and further the steam consumption during rectifying is big.
Given this, the objective of the invention is provides a kind of more simple effective and energy-conservation feasible method that is reclaimed methyl alcohol in the methyl alcohol building-up process by circulation gas at above-mentioned situation, to improve the methanol output of methanol synthesizing process.Simultaneously, make this method of the present invention both can with the supporting use of newly-built methanol device, also can be used for building that system for methanol synthesis is transformed and perfect.
Reclaim the method for methyl alcohol in the methyl alcohol building-up process of the present invention by circulation gas, be that the circulation gas that will send after thick methyl alcohol separates is cooled to 10 ℃-12 ℃, separate the gas of removing behind the first alcohol and water that is condensed that returns and mix with fresh synthesis gas again and enter system for methanol synthesis.Generally, by the circulation gas temperature of sending in the thick methanol separator be generally～40 ℃, its methanol content～0.5%.Test shows, it is cooled to 10 ℃-12 ℃ and separate and be re-used as the gas that returns that returns synthesis system after removing the first alcohol and water that is condensed, can make this return in the gas methanol content by～0.5% be reduced to～0.15%.This just means that the throughput that can make synthesis system methyl alcohol is corresponding and has improved 10%～15%.And the method flow that methyl alcohol is reclaimed in this cooling is simple, and working method is reliable.Above-mentioned to handling by the cooling of the circulation gas of sending after the thick methyl alcohol separation, can adopt equipment such as direct combustion unit commonly used in the engineering freezes, electricity drives ice maker system refrigeration, steam jet refrigeration, spraying high-pressure gas refrigeration and/or mode that low-temperature receiver is provided, also can provide low-temperature receiver by the cold more than needed of general facilities.
For the energy in the system can be fully utilized fully, with further save energy, when adopting aforesaid method of the present invention, better mode is that the cooling of the above-mentioned said circulation gas of sending after thick methyl alcohol separates is carried out in two steps: the first step will be somebody's turn to do the circulation gas of sending earlier after thick methyl alcohol separates, handle and separate the low temperature of removing behind the first alcohol and water that is condensed and return gas with doing in advance to lower the temperature by aforesaid method of the present invention, by water cooler or other suitable heat exchanging apparatus be cooled in advance～26 ℃, carried out for second step then, provide low-temperature receiver further to be cooled to said 10 ℃-12 ℃ by suitable refrigeration system again.Real running results show, in the pre-temperature-fall period of the first step, after heat exchange was carried out in cold and hot logistics, the hot stream temperature of the circulation gas of lowering the temperature in advance can be reduced to 26 ℃ ± 4 ℃ by～40 ℃, and the temperature of returning the air cooling logistics then can be by 10 ℃～12 ℃ rises to 30 ℃ ± 5 ℃; The first step be cooled in advance～26 ℃ logistics continues to be cooled to required 10 ℃～12 ℃ by refrigeration equipment again, mix with fresh synthesis gas and the circulation of returning synthesis system is returned the temperature of gas and also obtained pre-heating temperature elevation.Energy in the system can be fully utilized fully.
Below by specific embodiment foregoing of the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following example.
Embodiment 1
This example is for being applied to the methanol synthesizer with Sweet natural gas and steam reforming preparing synthetic gas.The circulation gas of sending by thick methanol separator, to carry out the first step pre-cooled with separating that the low temperature of removing condensation first alcohol and water returns that gas carries out heat exchange with having carried out cooling in advance for the heat exchanger that uses through routine or the heat-exchanger rig of other appropriate form, makes its temperature reduce to 25 ℃ by 40 ℃; And then enter next water cooler, and after continuing it is cooled to 10 ℃ by gas-direct burning unit refrigeration system, send into separator, separate and remove the first alcohol and water that is condensed.Separate the gas that returns remove this condensation first alcohol and water and send to heat exchanger in its first step precooling stage earlier, be used for the follow-up circulation gas of proceeding to handle is carried out the pre-cooled cooling of the first step, and make simultaneously its temperature be increased to～30 ℃, mix with fresh synthesis gas again after discharging portion gas by processing requirement, send to recycle compressor.
Produce methyl alcohol 10 * 10 per year in this example
4In the device of ton, behind the above-mentioned cooling method for separating and processing of employing the present invention, the thick methyl alcohol that is obtained reclaiming from circulation gas by separator can reach 1.6 * 10
4In ton/year, methanol content is 89% (weight).
Embodiment 2
This example is for being applied to the methanol synthesizer with producing synthesis gas from coal.The circulation gas of sending by thick methanol separator, to carry out the first step pre-cooled with separating that the low temperature of removing condensation first alcohol and water returns that gas carries out heat exchange with having carried out cooling in advance for the heat exchanger that uses through routine or the heat-exchanger rig of other appropriate form, makes its temperature reduce to 26 ℃ by 40 ℃; And then enter next water cooler, make it continue to be cooled to 10 ℃ by electric motor driving ice maker refrigeration system after, send into separator, separate and to remove the first alcohol and water that has been condensed.Separate the gas that returns remove this condensation first alcohol and water and send to heat exchanger in its first step precooling stage earlier, be used for the follow-up circulation gas of proceeding to handle is carried out the pre-cooled cooling of the first step, and make simultaneously its temperature be increased to～30 ℃, mix with fresh synthesis gas again after discharging portion gas by processing requirement, send to recycle compressor.
Produce methyl alcohol 3 * 10 per year in this example
4In the device of ton, behind the above-mentioned cooling method for separating and processing of employing the present invention, the thick methyl alcohol that is obtained reclaiming from circulation gas by separator can reach 3.6 * 10
3In ton/year, methanol content is 88% (weight).
Claims (2)
1. reclaim the method for methyl alcohol in the methyl alcohol building-up process by circulation gas, it is characterized in that the circulation gas that will send after thick methyl alcohol separates is cooled to 10 ℃-12 ℃, the gas that returns that separation is removed behind the first alcohol and water that is condensed is mixed into system for methanol synthesis with fresh synthesis gas again.
2. reclaim the method for methyl alcohol in the methyl alcohol building-up process as claimed in claim 1 by circulation gas, it is characterized in that the cooling of the said circulation gas of sending after thick methyl alcohol separates is carried out in two steps, earlier with this circulation gas with do in advance to separate the low temperature of removing behind the first alcohol and water that is condensed return gas through heat exchange be cooled in advance～26 ℃, and then further be cooled to 10 ℃-12 ℃ by refrigeration system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00120527 CN1351000A (en) | 2000-10-31 | 2000-10-31 | Process for recovering methanol from circulating gas in methanol synthesizing procedure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00120527 CN1351000A (en) | 2000-10-31 | 2000-10-31 | Process for recovering methanol from circulating gas in methanol synthesizing procedure |
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| Publication Number | Publication Date |
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| CN1351000A true CN1351000A (en) | 2002-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN 00120527 Pending CN1351000A (en) | 2000-10-31 | 2000-10-31 | Process for recovering methanol from circulating gas in methanol synthesizing procedure |
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| CN (1) | CN1351000A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429098B (en) * | 2008-12-03 | 2011-10-26 | 西南化工研究设计院 | Method for synthesis of methanol with CO, CO2 and H#[-2] |
| CN102850183A (en) * | 2012-09-28 | 2013-01-02 | 神华集团有限责任公司 | Methanol synthesis system and method |
| CN102865754A (en) * | 2012-09-28 | 2013-01-09 | 神华集团有限责任公司 | Condenser and methanol synthesis system comprising condenser |
-
2000
- 2000-10-31 CN CN 00120527 patent/CN1351000A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101429098B (en) * | 2008-12-03 | 2011-10-26 | 西南化工研究设计院 | Method for synthesis of methanol with CO, CO2 and H#[-2] |
| CN102850183A (en) * | 2012-09-28 | 2013-01-02 | 神华集团有限责任公司 | Methanol synthesis system and method |
| CN102865754A (en) * | 2012-09-28 | 2013-01-09 | 神华集团有限责任公司 | Condenser and methanol synthesis system comprising condenser |
| CN102850183B (en) * | 2012-09-28 | 2014-09-17 | 神华集团有限责任公司 | Methanol synthesis system and method |
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