CN217220224U - MTO-grade methanol purification device - Google Patents
MTO-grade methanol purification device Download PDFInfo
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- CN217220224U CN217220224U CN202123397603.4U CN202123397603U CN217220224U CN 217220224 U CN217220224 U CN 217220224U CN 202123397603 U CN202123397603 U CN 202123397603U CN 217220224 U CN217220224 U CN 217220224U
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model discloses a MTO level methyl alcohol purification device, include: the system comprises a crude methanol flash tank, a stabilizing tower main condenser, a stabilizing tower auxiliary condenser, a stabilizing tower reflux tank, a stabilizing tower reboiler and a separator, wherein the crude methanol flash tank is connected with an inlet of the stabilizing tower, a gas phase outlet of the stabilizing tower is connected with an inlet of the stabilizing tower main condenser, an outlet of the stabilizing tower main condenser is connected with an inlet I of the stabilizing tower reflux tank, an outlet of the stabilizing tower main condenser is connected with an inlet of the stabilizing tower auxiliary condenser, a liquid phase outlet of the stabilizing tower auxiliary condenser is connected with an inlet of the separator, a methanol phase outlet of the separator is connected with an inlet II of the stabilizing tower reflux tank, and an outlet of the stabilizing tower reflux tank is connected with the stabilizing tower; the stabilizer reboiler is connected to the bottom of the stabilizer. The alkane oil and the methanol are separated by the separator, so that the content of fusel and carbonyl compounds in the crude methanol is reduced, and the quality of the MTO-grade methanol raw material is improved.
Description
Technical Field
The utility model belongs to the petrochemical field, concretely relates to MTO level methyl alcohol purification device.
Background
Normally only the dissolved gases (mainly CO) need to be removed from the crude methanol in order to reach the MTO grade methanol specification 2 ) And some light components, this is achieved through rectifying in the stabilizer, in the reboiler of stabilizer by low-pressure steam provide the reboiling heat, the gas of stabilizer top flows to the main condenser of stabilizer at first, the gaseous phase then enters the auxiliary condenser of stabilizer and cools to 43 deg.C, the non-condensable gas is separated from the condensate, deliver to the fuel gas system outside the boundary area under the control of pressure. The process only reduces the content of light components in the crude methanol, but cannot effectively reduce the content of fusel in the crude methanol, and the existence of the fusel indirectly influences the selectivity of the olefin reaction catalyst.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of the prior art, the utility model provides an MTO-level methanol purification device.
An MTO grade methanol purification unit comprising: the system comprises a crude methanol flash tank, a stabilizing tower main condenser, a stabilizing tower auxiliary condenser, a stabilizing tower reflux tank, a stabilizing tower reboiler and a separator, wherein the crude methanol flash tank is connected with an inlet of the stabilizing tower, a gas phase outlet of the stabilizing tower is connected with an inlet of the stabilizing tower main condenser, an outlet of the stabilizing tower main condenser is connected with an inlet I of the stabilizing tower reflux tank, an outlet of the stabilizing tower main condenser is connected with an inlet of the stabilizing tower auxiliary condenser, a liquid phase outlet of the stabilizing tower auxiliary condenser is connected with an inlet of the separator, a methanol phase outlet of the separator is connected with an inlet II of the stabilizing tower reflux tank, and an outlet of the stabilizing tower reflux tank is connected with the stabilizing tower;
the stabilizer reboiler is connected to the bottom of the stabilizer.
Further, a stabilizing tower reflux pump is arranged between the stabilizing tower reflux tank and the stabilizing tower.
Further, the main condenser of the stabilizing tower is an air cooler.
Further, the auxiliary condenser of the stabilizing tower is a water-cooled condenser.
Further, circulating upper water and lower water are adopted as cooling water of the auxiliary condenser of the stabilizing tower.
Further, the gas at the gas phase outlet of the auxiliary condenser of the stabilizing tower is non-condensable gas.
Further, a heat source of the stabilizer reboiler is provided by low-pressure steam, and low-pressure steam condensate is formed after cooling, wherein the pressure of the low-pressure steam is 0.45 MPa.
Crude methanol leaving the bottom of the crude methanol flash drum enters a stabilizer column, from which dissolved gases (mainly CO) need to be removed in order to reach MTO grade methanol specifications 2 ) And some light components, which is achieved by rectification in a stabilizer column. In a reboiler of the stabilizer, low-pressure steam (0.45MPa) provides reboiling heat, the gas at the top of the stabilizer flows to a main condenser 3 of the stabilizer, and is cooled to 50-60 ℃ by air cooling, and the gas phase from the main condenser of the stabilizer enters an auxiliary condenser of the stabilizer and is cooled to 43 ℃. The non-condensable gases are separated from the condensate and fed under pressure control to a fuel gas system outside the battery limits. The liquid phase outlet of the auxiliary condenser at the top of the stabilizing tower is provided with a separator to separate the alkane oil from the methanol, so that the content of fusel alcohol in the methanol raw material is reduced as much as possible. The alkane oil substances of the alkane oil production pipeline are produced by a separator, methanol phase condensate from the auxiliary condenser and the separator of the stabilizing tower flows into a reflux tank of the stabilizing tower and is sent back to a tower tray at the top of the stabilizing tower by a reflux pump of the stabilizing tower, and an MTO-grade methanol product leaves the bottom of the stabilizing tower under the control of liquid level.
The utility model has the advantages that:
1. the alkane oil and the methanol are separated by arranging a separator at a liquid phase outlet of the auxiliary cooler at the top of the stabilizing tower, so that the content of fusel and carbonyl compounds in the crude methanol is reduced, and the quality of the MTO-grade methanol raw material is improved.
2. Fusel and carbonyl compounds in the methanol are easy to generate oxygen-containing compounds and other heavy products under the olefin reaction condition, and then the selectivity of the olefin catalyst is possibly influenced, the utility model discloses can effectively reduce the fusel content in the MTO-level methanol raw material.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the system comprises a crude methanol flash tank, 2, a stabilizer, 3, a stabilizer main condenser, 4, a stabilizer auxiliary condenser, 5, a stabilizer reflux tank, 6, a stabilizer reboiler, 7, a stabilizer reflux pump, 8 and a separator.
Detailed Description
The following non-limiting examples will allow one of ordinary skill in the art to more fully understand the present invention without limiting it in any way.
Example 1
An MTO-grade methanol purification unit comprising: a crude methanol flash evaporation tank 1, a stabilizing tower 2, a stabilizing tower main condenser 3, a stabilizing tower auxiliary condenser 4, a stabilizing tower reflux tank 5, a stabilizing tower reboiler 6 and a separator 8, the crude methanol flash tank 1 is connected with the inlet of a stabilizing tower 2 through a pipeline, the gas phase outlet of the stabilizing tower 2 is connected with the inlet of a main condenser 3 of the stabilizing tower through a pipeline, the outlet of the main condenser 3 of the stabilizing tower is connected with the inlet I of the reflux tank 5 of the stabilizing tower through a pipeline, the outlet of the stabilizer main condenser 3 is connected with the inlet of the stabilizer auxiliary condenser 4 through a pipeline, the liquid phase outlet of the stabilizer auxiliary condenser 4 is connected with the inlet of a separator 8 through a pipeline, the methanol phase outlet of the separator 8 is connected with the inlet II of a stabilizer reflux tank 5 through a pipeline, the outlet of the stabilizing tower reflux tank 5 is connected with the inlet of a stabilizing tower reflux pump 7 through a pipeline, and the outlet of the stabilizing tower reflux pump 7 is connected with the stabilizing tower 2 through a pipeline; the stabilizer reboiler is connected to the bottom of stabilizer 2. The main condenser 3 of the stabilizing tower is an air cooler; the stabilizing tower auxiliary condenser 4 is a water-cooled condenser, and the cooling water of the stabilizing tower auxiliary condenser 4 adopts circulating upper water and lower water.
The crude methanol leaving the bottom of the crude methanol flash tank 1 enters the stabilizer column 2 and in order to reach the MTO grade methanol specification, it is necessary to remove dissolved gases (mainly CO) from the crude methanol 2 ) And some light components, which is achieved by rectification in the stabilizer column 2. In a stabilizer reboiler 6, low-pressure steam (0.45MPa) provides reboiling heat, gas at the top of the stabilizer 2 flows to a stabilizer main condenser 3, and is cooled to 50-60 ℃ by air cooling, and the gas phase from the stabilizer main condenser 3 enters a stabilizer auxiliary condenser 4 to be cooled to 43 ℃. The non-condensable gases are separated from the condensate and fed under pressure control to a fuel gas system outside the battery limits. The liquid phase outlet of the auxiliary condenser 4 at the top of the stabilizing tower is provided with a separator 8 to separate the alkane oil from the methanol, so that the content of fusel alcohol in the methanol raw material is reduced as much as possible. Alkane oil substances of an alkane oil extraction pipeline are extracted through a separator 8, methanol phase condensate from a stabilizer secondary condenser 4 and the separator 8 flows into a stabilizer reflux tank 5, the methanol phase condensate is sent back to a tower tray at the top of a stabilizer 2 through a stabilizer reflux pump 7, and an MTO-grade methanol product leaves the bottom of the stabilizer 2 under the liquid level control.
The ethanol content in the crude methanol is 1100PPm through sampling analysis and comparison, and the ethanol content in the MTO-grade methanol raw material after the alkane oil is extracted by the stabilizing tower 2 is 100 PPm.
Claims (4)
1. An MTO-grade methanol purification apparatus, comprising: the system comprises a crude methanol flash tank, a stabilizing tower main condenser, a stabilizing tower auxiliary condenser, a stabilizing tower reflux tank, a stabilizing tower reboiler and a separator, wherein the crude methanol flash tank is connected with an inlet of the stabilizing tower, a gas phase outlet of the stabilizing tower is connected with an inlet of the stabilizing tower main condenser, an outlet of the stabilizing tower main condenser is connected with an inlet I of the stabilizing tower reflux tank, an outlet of the stabilizing tower main condenser is connected with an inlet of the stabilizing tower auxiliary condenser, a liquid phase outlet of the stabilizing tower auxiliary condenser is connected with an inlet of the separator, a methanol phase outlet of the separator is connected with an inlet II of the stabilizing tower reflux tank, and an outlet of the stabilizing tower reflux tank is connected with the stabilizing tower;
the stabilizer reboiler is connected to the bottom of the stabilizer.
2. The MTO-grade methanol purification apparatus of claim 1, wherein a stabilizer reflux pump is disposed between the stabilizer reflux drum and the stabilizer.
3. The MTO grade methanol purification unit of claim 1, wherein the stabilizer main condenser is an air cooler.
4. The MTO-grade methanol purification apparatus of claim 1, wherein said stabilizer sub-condenser is a water-cooled condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123397603.4U CN217220224U (en) | 2021-12-30 | 2021-12-30 | MTO-grade methanol purification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123397603.4U CN217220224U (en) | 2021-12-30 | 2021-12-30 | MTO-grade methanol purification device |
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| Publication Number | Publication Date |
|---|---|
| CN217220224U true CN217220224U (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123397603.4U Active CN217220224U (en) | 2021-12-30 | 2021-12-30 | MTO-grade methanol purification device |
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|---|---|
| CN (1) | CN217220224U (en) |
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2021
- 2021-12-30 CN CN202123397603.4U patent/CN217220224U/en active Active
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