CN105777491A - Coarse methanol gas separation system and method - Google Patents
Coarse methanol gas separation system and method Download PDFInfo
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- CN105777491A CN105777491A CN201610127920.9A CN201610127920A CN105777491A CN 105777491 A CN105777491 A CN 105777491A CN 201610127920 A CN201610127920 A CN 201610127920A CN 105777491 A CN105777491 A CN 105777491A
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- 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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Abstract
The invention provides a coarse methanol gas separation system and method.The coarse methanol gas separation system comprises a first cooling device and a coarse methanol separator, wherein the first cooling device is provided with a first to-be-cooled gas inlet and a first cooled gas outlet, the coarse methanol separator is provided with a to-be-separated gas inlet, a separated gas outlet and a methanol liquid outlet, and the to-be-separated gas inlet is communicated with the first cooled gas outlet.The coarse methanol gas separation system further comprises a first gas-liquid separator, wherein the first gas-liquid separator is provided with a coarse methanol gas inlet, a first gas outlet and a first wax liquid outlet, and the first gas outlet is communicated with the first to-be-cooled gas inlet.Coarse methanol gas passes through the first gas-liquid separator before entering the first cooling device, and a waxy mixture in the coarse methanol gas can be separated out in the liquid form by the first gas-liquid separator.In this way, the content of the waxy mixture in the coarse methanol gas can be easily reduced, and the cooling efficiency of the first cooling device can be easily improved, so that the separating effect of the coarse methanol separator is improved, and long-period stable operation of the coarse methanol gas separation system is promoted.
Description
Technical field
The present invention relates to methanol-fueled CLC field, in particular to a kind of crude carbinol gas separating system and separation method.
Background technology
In the building-up process of methanol, generally along with the generation of by-product paraffin.The waxiness mixture comprising by-product paraffin in system for methanol synthesis would generally be attached in cooler on the inwall of heat exchanger tube, and this can be easily caused system for methanol synthesis impaired heat exchange efficiency.Heat exchange efficiency reduction can cause heat exchange after temperature not reach technique temperature required, thus causing separating methanol effect poor, this can cause that in synthetic cyclic gas, methanol content raises.Suppressing methanol-fueled CLC when methanol content is higher in synthetic cyclic gas, cause circulating flow rate to sharply increase therewith, and then can cause the low conversion rate that methanol reacts, yield declines and the series of problems such as energy expenditure increasing.In order to solve the problems referred to above, it is common practice to remove the wax of heat-exchange tube of cooler surface attachment so that it recovers heat transfer effect according to process condition irregularly (average 15 days once).But every time wax removing must flow through reduction load and reduces methanol output and realize, this makes methanol production efficiency totally decline, and economic benefit is also affected by certain impact simultaneously.
Summary of the invention
A kind of crude carbinol gas separating system of offer and separation method, the problem causing separating methanol inefficient to solve paraffin in existing crude carbinol gas separating system to be adsorbed in cooler are provided.
To achieve these goals, one aspect of the invention provides a kind of crude carbinol gas separating system, comprising: the first chiller, is provided with the first gas entrance to be cooled and the first cooling gas outlet；Crude carbinol separator, is provided with gas entrance to be separated, separation gas outlet and methanol solution outlet, and gas entrance to be separated and the first cooling gas outlet are connected；Crude carbinol gas separating system also includes: the first gas-liquid separator, is provided with crude carbinol gas entrance, the first gas outlet and the outlet of the first wax liquid, and the first gas outlet is connected with the first gas entrance to be cooled.
Further, crude carbinol gas separating system also includes the second gas-liquid separator, being provided with the second gas access, the second gas outlet and the outlet of the second wax liquid, the second gas access cools down gas outlet and is connected with first, and the second gas outlet is connected with gas entrance to be separated.
Further, crude carbinol gas separating system also includes the second chiller, is provided with the second gas entrance to be cooled and the second cooling gas outlet, and the second gas entrance to be cooled and the second gas outlet are connected, and the second cooling gas outlet is connected with gas entrance to be separated.
Further, along the flow direction of crude carbinol gas, the upstream of the first gas-liquid separator is additionally provided with intermediate heat exchanger.
Further, crude carbinol gas separating system also includes wax liquid collecting tank, is provided with wax liquid entrance, and wax liquid entrance is connected with the first wax liquid outlet and the outlet of the second wax liquid respectively.
Further, the first chiller is air cooler, and the second chiller is water cooler.
Another fermentation of the present invention additionally provides a kind of crude carbinol separation method, including: the first gas-liquid separation step: crude carbinol gas is carried out the first gas-liquid separation, obtain the first gas and wax liquid；First cooling step: the first gas is carried out first time cooling, obtains the first cooling gas；Crude carbinol separating step: the first cooling gas is easily separated and obtains methanol and separation gas.
Further, also including cooling down gas by first and carry out the step of the second gas-liquid separation between the first cooling step and crude carbinol separating step, the step of the second gas-liquid separation carries out the second gas-liquid separation for cooling down gas by first, obtains the second gas and wax liquid.
Further, also including the second cooling step between the second gas-liquid separation step and crude carbinol separating step, the second cooling step includes the second gas carries out second time cooling, obtains the second cooling gas.
Further, the temperature of the first gas-liquid separation is 98～110 DEG C, and pressure is 7.4～8.0MPa.
Further, the temperature of the second gas-liquid separation is 60～72 DEG C, and pressure is 7.3～8.0MPa.
Further, the temperature that crude carbinol separates is 40～50 DEG C, and pressure is 7.2～8.0MPa.
Application technical scheme, crude carbinol gas is made to first pass through the first gas-liquid separator before entering chiller, waxiness mixture in crude carbinol gas can be separated by fluid form, thus advantageously reducing waxiness mixture content in crude carbinol gas, improve the cooling effectiveness of chiller, and then make the separating effect of crude carbinol separator also improve accordingly, be conducive to making the stable operation of crude carbinol gas separating system longer cycle simultaneously.
Accompanying drawing explanation
The Figure of description constituting the part of the application is used for providing a further understanding of the present invention, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 illustrates the schematic diagram of a kind of crude carbinol air separation that a kind of exemplary embodiment of the present invention provides；And
Fig. 2 illustrates the schematic diagram of a kind of crude carbinol air separation that a kind of preferred implementation of the present invention provides.
Wherein, above-mentioned accompanying drawing includes the following drawings labelling:
10, the first chiller；101, the first gas entrance to be cooled；102, the first cooling gas outlet；20, crude carbinol separator；201, gas entrance to be separated；202, separation gas outlet；203, methanol solution outlet；30, the first gas-liquid separator；301, crude carbinol gas entrance；302, the first gas outlet；303, the first wax liquid outlet；40, the second gas-liquid separator；401, the second gas access；402, the second gas outlet；403, the second wax liquid outlet；50, the second chiller；51, the second gas entrance to be cooled；52, the second cooling gas outlet；60, intermediate heat exchanger；70, wax liquid collecting tank；701, wax liquid entrance.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
Described by background technology, in existing crude carbinol gas separating system, paraffin is adsorbed in cooler and causes the inefficient problem of separating methanol.In order to solve above-mentioned technical problem, one exemplary embodiment of the present invention provides a kind of crude carbinol piece-rate system, as shown in Figure 1, this crude carbinol gas separating system includes the first chiller 10, crude carbinol separator 20 and the first gas-liquid separator 30, and the first chiller 10 is provided with the first gas entrance 101 to be cooled and the first cooling gas outlet 102；Crude carbinol separator 20 is provided with gas entrance 201 to be separated, separation gas outlet 202 and methanol solution outlet 203, and gas entrance 201 to be separated cools down gas outlet 102 and is connected with first；First gas-liquid separator 30 is provided with crude carbinol gas entrance the 301, first gas outlet 302 and the first wax liquid outlet 303, and the first gas outlet 302 is connected with the first gas entrance 101 to be cooled.
In the crude carbinol gas separating system that the application provides, crude carbinol gas is made to first pass through the first gas-liquid separator 30 before entering the first chiller 10, the first gas-liquid separator 30 is utilized to be separated in fluid form by the waxiness mixture in crude carbinol gas, thus advantageously reducing waxiness mixture content in crude carbinol gas, improve the cooling effectiveness of the first chiller 10, and then make the separating effect of crude carbinol separator 20 also improve accordingly, be conducive to making the stable operation of crude carbinol gas separating system longer cycle simultaneously.
In actual application, the crude carbinol gas entrance 301 of above-mentioned crude carbinol gas separating system can export with the crude carbinol gas of methyl alcohol synthetic reactor and be connected.
In a preferred embodiment, this crude carbinol gas separating system also includes the second gas-liquid separator 40, this second gas-liquid separator 40 is provided with second gas access the 401, second gas outlet 402 and the second wax liquid outlet 403, second gas access 401 cools down gas outlet 102 and connects with first, and the second gas outlet 402 connects with gas entrance 201 to be separated.Arranging the second gas-liquid separator 40 to be conducive to reducing the content of waxiness mixture in crude carbinol gas further, thus improving the cooling effect of cooler further, and then improving the separation efficiency of methanol.
In a preferred embodiment, as shown in Figure 2, this crude carbinol gas separating system also includes the second chiller 50, this second chiller 50 is provided with the second gas entrance 51 to be cooled and the second cooling gas outlet 52, and second gas entrance 51 to be cooled be connected with the second gas outlet 402, the second cooling gas outlet 52 is connected with gas entrance 201 to be separated.Second chiller is conducive to improving further cooling effect, and then improves the separation efficiency of methanol.
In a preferred embodiment, along the flow direction of crude carbinol gas, the upstream of the first gas-liquid separator 30 is additionally provided with intermediate heat exchanger 60, for reclaiming the heat of crude carbinol gas.Arrange intermediate heat exchanger 60 to be conducive to reclaiming the heat in crude carbinol gas in above-mentioned position, reduce energy loss.
In a preferred embodiment, also include wax liquid collecting tank 70, be provided with wax liquid entrance 701, and wax liquid entrance 701 is connected with the first wax liquid outlet 303 and the second wax liquid outlet 403 respectively.Arrange wax liquid collecting tank 70 to be conducive to recycling wax liquid.In actual use, wax liquid collecting tank 70 is provided with the outlet of wax liquid, in order to wax liquid is discharged to secondary and utilizes.
In a preferred embodiment, the first chiller 10 is air cooler, and described second chiller 50 is water cooler.First use air cooler to be conducive to saving the consumption of cooling water, and then save cost.
Another aspect of the present invention provides a kind of crude carbinol separation method, including: the first gas-liquid separation step, the first cooling step and crude carbinol piece-rate system, wherein, the first gas-liquid separation device, for crude carbinol gas is carried out the first gas-liquid separation, obtains the first gas and wax liquid；First cooling step, for the first gas carries out first time cooling, obtains the first cooling gas；Crude carbinol separating step obtains methanol and separation gas for being easily separated by the first cooling gas.
In the crude carbinol gas separation method that the application provides, crude carbinol gas is made first to carry out the first gas-liquid separation step before cooling.Waxiness mixture in crude carbinol gas can be separated by fluid form, thus advantageously reducing waxiness mixture content in crude carbinol gas, improve the cooling effectiveness of the first chiller 10, and then make the separating effect of crude carbinol separator 20 also improve accordingly, be conducive to making the stable operation of crude carbinol gas separating system longer cycle simultaneously.Said method is simple, easily operated and time saving and energy saving.
Above-mentioned crude carbinol separation method has higher separating methanol efficiency.In a preferred embodiment, between the first cooling step and crude carbinol separating step, also include cooling down gas by first carry out the step of the second gas-liquid separation, the step of this second gas-liquid separation carries out the second gas-liquid separation for cooling down gas by first, obtains the second gas and wax liquid.Carrying out the second gas-liquid separation to be conducive to reducing the content of waxiness mixture in crude carbinol gas further, thus improving the cooling effect of cooler further, and then improving the separation efficiency of methanol.
In a preferred embodiment, also including the second cooling step between the second gas-liquid separation step and crude carbinol separating step, this second cooling step includes the second gas carries out second time cooling, obtains the second cooling gas.
Under uniform temperature, pressure, can ensure that methanol is entirely gaseous state, waxiness is entirely liquid, wax thus can be made to separate from system, thus advantageously reduce the content of waxiness mixture in heat exchanger crude carbinol gas separating system, thus improve heat exchange efficiency and the methanol yield of cooling heat exchanger.In a preferred embodiment, the temperature of the first gas-liquid separation is 98～110 DEG C, and pressure is 7.4～8.0MPa.Said temperature and pressure is adopted to be conducive to improving the separation efficiency of waxiness mixture.
In a preferred embodiment, the temperature of the second gas-liquid separation is 60～72 DEG C, and pressure is 7.3～8.0MPa.Said temperature and pressure is adopted to be conducive to improving further the separation efficiency of waxiness mixture.
In a preferred embodiment, the temperature that crude carbinol separates is 40～50 DEG C, and pressure is 7.2～8.0MPa.Said temperature and pressure is adopted to be conducive to improving further the separation efficiency of methanol.
Below in conjunction with specific embodiment, the present invention being described in further detail, these embodiments are it is not intended that limit present invention scope required for protection.
Embodiment 1
Crude carbinol gas is passed into after intermediate heat exchanger 60 is down to 105 DEG C by 290 DEG C the first gas-liquid separator 30, under 105 DEG C and 7.8MPa, carries out first time gas-liquid separation, obtain the first gas and wax liquid；
First gas passes into the first chiller 10 (air cooler), and temperature is down to 65 DEG C, obtains the first cooling gas；
Then cool down gas by first and pass into the second gas-liquid separator 40, under 65 DEG C and 7.6MPa, carry out second time gas-liquid separation, obtain the second gas and wax liquid；
Being passed into by second gas in the second chiller 50 (water cooler), temperature is down to less than 50 DEG C, obtains gas to be separated；Then gas to be separated is passed in crude carbinol separator 20, carry out gas-liquid separation when temperature is 7.3MPa lower than 50 DEG C with pressure, obtain methanol solution and separation gas.
Embodiment 2
Crude carbinol gas is passed into after intermediate heat exchanger 60 is down to 105 DEG C by 290 DEG C the first gas-liquid separator 30, under 105 DEG C and 7.4MPa, carries out first time gas-liquid separation, obtain the first gas and wax liquid；
First gas passes into the first chiller 10 (air cooler), and temperature is down to 60 DEG C, obtains the first cooling gas；
Being passed into by second gas in the second chiller 50 (water cooler), temperature is down to less than 50 DEG C, obtains gas to be separated；Then gas to be separated is passed in crude carbinol separator 20, carry out gas-liquid separation when temperature is 7.3MPa lower than 50 DEG C with pressure, obtain methanol solution and separation gas.
Embodiment 3
Crude carbinol gas is passed into after intermediate heat exchanger 60 is down to 105 DEG C by 290 DEG C the first gas-liquid separator 30, under 105 DEG C and 8.0MPa, carries out first time gas-liquid separation, obtain the first gas and wax liquid；
First gas passes into the first chiller 10 (air cooler), and temperature is down to 65 DEG C, obtains the first cooling gas；
Then cool down gas by first and pass into the second gas-liquid separator 40, under 65 DEG C and 7.6MPa, carry out second time gas-liquid separation, obtain the second gas and wax liquid；
Being passed into by second gas in the second chiller 50 (water cooler), temperature is down to less than 50 DEG C, obtains gas to be separated；Then gas to be separated is passed in crude carbinol separator 20, carry out gas-liquid separation when temperature is 7.5MPa lower than 50 DEG C with pressure, obtain methanol solution and separation gas.
Embodiment 4
Crude carbinol gas is passed into after intermediate heat exchanger 60 is down to 105 DEG C by 290 DEG C the first gas-liquid separator 30, under 105 DEG C and 8.0MPa, carries out first time gas-liquid separation, obtain the first gas and wax liquid；
First gas passes into the first chiller 10 (air cooler), and temperature is down to less than 50 DEG C, obtains gas to be separated；Then gas to be separated is passed in crude carbinol separator 20, carry out gas-liquid separation when temperature is 7.5MPa lower than 50 DEG C with pressure, obtain methanol solution and separation gas.
Comparative example 1
Crude carbinol gas passes into the first chiller 10 (air cooler) and the second chiller 50 (water cooler) after intermediate heat exchanger 60 is down to 105 DEG C by 290 DEG C, and temperature is down to less than 50 DEG C, obtains gas to be separated；Then gas to be separated is passed in crude carbinol separator 20, carry out gas-liquid separation when temperature is 7.3MPa lower than 50 DEG C with pressure, obtain methanol solution and separation gas.
The time that in embodiment 1 to 4 and comparative example 1, crude carbinol gas separating system works at temperature is lower than 50 DEG C is in Table 1.
In embodiment 1 to 4 and comparative example 1 in crude carbinol gas separating system separating methanol efficiency in Table 2.
Table 1
Table 2
In from the description above, can be seen that, the above embodiments of the present invention achieve following technique effect: adopt crude carbinol segregation apparatus provided by the invention, the time that crude carbinol separator is operated at a lower temperature is obviously prolonged, it can thus be appreciated that adopt crude carbinol segregation apparatus provided by the invention can effective wax removing and then improve operation time of system, the separation efficiency of methanol can also be substantially improved simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (12)
1. a crude carbinol gas separating system, including:
First chiller (10), is provided with the first gas entrance (101) to be cooled and the first cooling gas outlet (102)；
Crude carbinol separator (20), it is provided with gas entrance (201) to be separated, separation gas outlet (202) and methanol solution outlet (203), and described gas entrance (201) to be separated cools down gas outlet (102) with described first and is connected；
It is characterized in that, described crude carbinol gas separating system also includes:
First gas-liquid separator (30), it is provided with crude carbinol gas entrance (301), first gas outlet (302) and the first wax liquid outlet (303), described first gas outlet (302) is connected with described first gas entrance (101) to be cooled.
2. crude carbinol gas separating system according to claim 1, it is characterised in that described crude carbinol gas separating system also includes
Second gas-liquid separator (40), it is provided with the second gas access (401), the second gas outlet (402) and the second wax liquid outlet (403), described second gas access (401) cools down gas outlet (102) with described first and is connected, and described second gas outlet (402) is connected with described gas entrance (201) to be separated.
3. crude carbinol gas separating system according to claim 2, it is characterized in that, described crude carbinol gas separating system also includes the second chiller (50), it is provided with the second gas entrance (51) to be cooled and the second cooling gas outlet (52), and second gas entrance (51) to be cooled be connected with described second gas outlet (402), described second cooling gas outlet (52) is connected with described gas entrance (201) to be separated.
4. crude carbinol gas separating system according to any one of claim 1 to 3, it is characterised in that along the flow direction of described crude carbinol gas, the upstream of described first gas-liquid separator (30) is additionally provided with intermediate heat exchanger (60).
5. crude carbinol gas separating system according to claim 2, it is characterized in that, described crude carbinol gas separating system also includes wax liquid collecting tank (70), it is provided with wax liquid entrance (701), and described wax liquid entrance (701) is connected with described first wax liquid outlet (303) and described second wax liquid outlet (403) respectively.
6. crude carbinol gas separating system according to claim 3, it is characterised in that described first chiller (10) is air cooler, described second chiller (50) is water cooler.
7. a crude carbinol separation method, it is characterised in that including:
First gas-liquid separation step: crude carbinol gas is carried out the first gas-liquid separation, obtains the first gas and wax liquid；
First cooling step: described first gas is carried out first time cooling, obtains the first cooling gas；
Crude carbinol separating step: described first cooling gas is easily separated and obtains methanol and separation gas.
8. method according to claim 7, it is characterized in that, between described first cooling step and described crude carbinol separating step, also include cooling down gas by described first carry out the step of the second gas-liquid separation, the step of described second gas-liquid separation carries out the second gas-liquid separation for cooling down gas by described first, obtains the second gas and wax liquid.
9. method according to claim 8, it is characterized in that, also including the second cooling step between described second gas-liquid separation step and described crude carbinol separating step, described second cooling step includes described second gas carries out second time cooling, obtains the second cooling gas.
10. method according to claim 8 or claim 9, it is characterised in that the temperature of described first gas-liquid separation is 98～110 DEG C, pressure is 7.4～8.0MPa.
11. method according to claim 10, it is characterised in that the temperature of described second gas-liquid separation is 60～72 DEG C, pressure is 7.3～8.0MPa.
12. method according to claim 11, it is characterised in that the temperature that crude carbinol separates is 40～50 DEG C, and pressure is 7.2～8.0MPa.
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| CN201610127920.9A CN105777491A (en) | 2016-03-07 | 2016-03-07 | Coarse methanol gas separation system and method |
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| CN201610127920.9A CN105777491A (en) | 2016-03-07 | 2016-03-07 | Coarse methanol gas separation system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112494977A (en) * | 2020-10-28 | 2021-03-16 | 中石化宁波工程有限公司 | Three-phase separation equipment and method for methanol reaction product |
| CN114531875A (en) * | 2019-05-20 | 2022-05-24 | 沙特基础工业全球技术公司 | On-line process for treating wax-containing crude methanol stream |
| US11753359B2 (en) | 2019-05-20 | 2023-09-12 | Sabic Global Technologies B.V. | Online method for processing wax-containing crude methanol stream |
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| CN2863793Y (en) * | 2006-01-13 | 2007-01-31 | 钱怡西 | Apparatus for preventing paraffin deposit in menthol production |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114531875A (en) * | 2019-05-20 | 2022-05-24 | 沙特基础工业全球技术公司 | On-line process for treating wax-containing crude methanol stream |
| US11753359B2 (en) | 2019-05-20 | 2023-09-12 | Sabic Global Technologies B.V. | Online method for processing wax-containing crude methanol stream |
| CN114531875B (en) * | 2019-05-20 | 2024-03-26 | 沙特基础工业全球技术公司 | On-line process for treating waxy crude methanol stream |
| CN112494977A (en) * | 2020-10-28 | 2021-03-16 | 中石化宁波工程有限公司 | Three-phase separation equipment and method for methanol reaction product |
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Application publication date: 20160720 |