CN106554260B - Methyl tert-butyl ether desulfurization process and device - Google Patents
Methyl tert-butyl ether desulfurization process and device Download PDFInfo
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- CN106554260B CN106554260B CN201510640461.XA CN201510640461A CN106554260B CN 106554260 B CN106554260 B CN 106554260B CN 201510640461 A CN201510640461 A CN 201510640461A CN 106554260 B CN106554260 B CN 106554260B
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- butyl ether
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
- C07C41/01—Preparation of ethers
- C07C41/34—Separation; Purification; Stabilisation; Use of additives
- C07C41/40—Separation; Purification; Stabilisation; Use of additives by change of physical state, e.g. by crystallisation
- C07C41/42—Separation; Purification; Stabilisation; Use of additives by change of physical state, e.g. by crystallisation by distillation
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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
- 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
- Y02P20/10—Process efficiency
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention belongs to the field of refining of methyl tert-butyl ether, and particularly relates to a process and a device for desulfurizing methyl tert-butyl ether. Adding a side line on a catalytic distillation tower, extracting gas-phase methyl tert-butyl ether, and separating a gas-liquid product through a hydrocyclone; the process is simple to operate, equipment such as a rectifying tower, a condenser, a reflux tank, a reboiler and the like is not required to be additionally arranged, the device investment is greatly reduced, the desulfurization effect is remarkable, the sulfur content in the methyl tert-butyl ether can be reduced to be below 1ppm, and the requirements of the motor gasoline of the fourth country or the fifth country are well met.
Description
Technical Field
The invention belongs to the field of refining of methyl tert-butyl ether, and particularly relates to a process and a device for desulfurizing methyl tert-butyl ether.
Background
With the gradual improvement of environmental protection standards, the restriction of China on the sulfur content of gasoline is more and more strict, wherein the sulfur content of the national V gasoline standard is required to be not more than 10mg/kg, and meanwhile, the region for executing the national V gasoline standard is rapidly expanded under the continuous influence of haze weather nationwide in recent years, the demand of the market on the national V gasoline is greatly increased, and the upgrading of the quality of oil products is urgent. Domestic gasoline is mainly catalytic cracking gasoline, and can meet the requirement that the sulfur content is not more than 10mg/kg by an adsorption desulfurization (namely S zorb) technology. However, methyl tert-butyl ether (MTBE) is used as a blending component of gasoline with a high octane number, the addition ratio of the MTBE is usually 8% -15%, and the sulfur content in the MTBE product is always high due to the enrichment effect of sulfur in the MTBE synthesis process, generally hundreds of mg/kg are produced by manufacturers, and even more than 1000mg/kg is produced by individual manufacturers. The high sulfur content of MTBE seriously affects the quality upgrading of gasoline, and the reduction of the sulfur content of MTBE is suitable for the situation requirement and meets the inevitable requirement of energy cleaning and environmental protection.
Patent CN200910018228 discloses a method for desulfurizing MTBE with high sulfur content. Putting the high-sulfur methyl tert-butyl ether into a distillation tower, heating by a reboiler, keeping the temperature of a tower kettle at 90-120 ℃, the pressure at 0.08 +/-0.02 MPa, the temperature of a tower top at 69-75 ℃ and the pressure at 0.06 +/-0.02 MPa, evaporating a finished product from the tower top, keeping the reflux ratio at 1-10, and recovering a sulfur product from the tower bottom. The sulfur of the MTBE raw material is removed by adopting a distillation method, and the sulfur can be reduced to below 10 ppm. Patent CN201310544446 discloses a method for desulfurizing methyl tert-butyl ether by a desulfurizing tower, comprising the following steps: conveying crude MTBE which comprises 98.45-98.55% of MTBE, 0.37-0.39% of butene, 0.38-0.40% of carbon, 0.39-0.41% of tert-butyl alcohol and 0.02-0.04% of sulfur-containing compounds to a desulfurizing tower, condensing a gas phase at the top of the desulfurizing tower by a desulfurizing tower condenser, feeding the gas phase into a desulfurizing tower reflux tank, boosting the pressure of a condensate produced after condensation by a pump, extracting one part of the condensate as fine MTBE after boosting the pressure, and conveying the other part of the condensate to the top of the desulfurizing tower as reflux; the heavy components at the bottom of the tower are intermittently extracted, and are pressurized and cooled to 38-42 ℃ by a pump to be used as products to be conveyed to a tank area. The disadvantages of the related patents are mainly: the desulfurizing tower and equipment such as a condenser, a reflux tank, a reboiler, a pump and the like matched with the desulfurizing tower are added, so that the device investment is greatly increased; and the added desulfurizing tower consumes a large amount of cooling water and water vapor, so that the energy consumption of the device is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a process and a device for desulfurizing methyl tert-butyl ether, which have the advantages of low device investment and low energy consumption.
A desulfurizing process for methyl tert-butyl ether features that a side line is added to a catalytic distillation tower, the gas-phase methyl tert-butyl ether is extracted, and the gas-liquid product is separated by a cyclone separator.
The methyl tert-butyl ether desulfurization process comprises the following specific steps:
a) a side draw-out port is arranged at the gas phase zone of the 5 th-10 th tower plate from bottom to top of the catalytic distillation tower, and gas phase methyl tert-butyl ether is drawn out;
b) the extracted methyl tert-butyl ether enters a hydrocyclone separator, micro liquid drops possibly carried are separated out after the separation by the hydrocyclone separator, and the liquid returns to the bottom of the tower under the self-pressure of gravity;
c) the gas-phase methyl tert-butyl ether is sent out of the device through the original heat exchanger, cooler and regulating valve;
d) the sulfur-containing heavy components from the bottom of the catalytic distillation tower can be desulfurized in a hydrofining device.
The operation conditions of the chemical distillation tower are that the temperature of the tower top is 50-60 ℃, the pressure is 0.60-0.70MPa, and the reflux ratio is 1:1-2: 1.
The methyl tert-butyl ether to be desulfurized is prepared by taking catalytic liquefied gas, coking liquefied gas or catalytic and coking mixed liquefied gas as raw materials, and the sulfur content of the methyl tert-butyl ether to be desulfurized is 10ppm to 3000 ppm.
The device for realizing the methyl tert-butyl ether desulfurization process comprises a catalytic distillation tower and a hydrocyclone separator, wherein the catalytic distillation tower is connected with the hydrocyclone separator through a side draw-off line, and the bottom of the hydrocyclone separator is connected with the bottom of the catalytic distillation tower.
The side draw-off line is arranged in a gas phase zone of the 5 th-10 th tower plate from bottom to top of the catalytic distillation tower.
The process disclosed by the invention is simple to operate, equipment such as a rectifying tower, a condenser, a reflux tank, a reboiler and the like is not required to be additionally arranged, the equipment investment is greatly reduced, the desulfurization effect is remarkable, the sulfur content in the methyl tert-butyl ether can be reduced to below 1ppm, and the requirements of the motor gasoline of the fourth country or the fifth country are well met.
Drawings
FIG. 1 is a flow diagram of the process for desulfurizing methyl tert-butyl ether according to the present invention.
Reference numerals shown in the figures: a 1-methyl tert-butyl ether feed line; 2-side draw off; 3-gas phase methyl tert-butyl ether; a 4-methyl tert-butyl ether liquid phase return line; 5-discharging from the tower kettle; 6-hydrocyclone separator; 7-a catalytic distillation column; 8-overhead condenser; 9-a reflux tank; 10-reflux pump; 11-a product discharge pump at the top of the tower; 12-overhead product.
Detailed Description
Example 1
The test was carried out on a catalytic distillation unit, starting material: containing 2300ppm of sulfur, and the operating conditions of the rectifying tower are as follows: the tower top temperature is 50 ℃, the tower top pressure is 0.64MPa, the reflux ratio is 1.2:1, and the side line is opened on the 5 th tower plate (from bottom to top) of the catalytic rectifying tower. The sulfur content of the treated methyl tert-butyl ether is less than 1 ppm.
Example 2
The test was carried out on a catalytic distillation unit, starting material: methyl tert-butyl ether containing 100ppm of sulfur, the operating conditions of the rectification column were: the tower top is 55 ℃, the pressure at the tower top is 0.70MPa, the reflux ratio is 1.0:1, and the side line is opened on the 6 th tower plate (from bottom to top) of the catalytic rectifying tower. The sulfur content of the treated methyl tert-butyl ether is less than 1 ppm.
Example 3
The test was carried out on a catalytic distillation unit, starting material: 10ppm sulphur containing methyl tert-butyl ether, the operating conditions of the rectification column are: the tower top is 55 ℃, the pressure at the tower top is 0.60MPa, the reflux ratio is 2.0:1, and the lateral line is opened on the 7 th tower plate (from bottom to top) of the catalytic rectifying tower. The sulfur content of the treated methyl tert-butyl ether is less than 1 ppm.
Example 4
The test was carried out on a catalytic distillation unit, starting material: 1000ppm sulfur-containing methyl tert-butyl ether, the operating conditions of the rectification column were: the tower top temperature is 60 ℃, the tower top pressure is 0.60MPa, the reflux ratio is 1.5:1, and the side line is opened on the 8 th tower plate (from bottom to top) of the catalytic rectifying tower. The sulfur content of the treated methyl tert-butyl ether is less than 1 ppm.
Example 5
The test was carried out on a catalytic distillation unit, starting material: 2000ppm sulphur containing methyl tert-butyl ether, the operating conditions of the rectification column were: the tower top temperature is 50 ℃, the tower top pressure is 0.67MPa, the reflux ratio is 1.0:1, and the side line is opened on the 9 th tower plate (from bottom to top) of the catalytic rectifying tower. The sulfur content of the treated methyl tert-butyl ether is less than 1 ppm.
Example 6
The test was carried out on a catalytic distillation unit, starting material: 3000ppm sulfur-containing methyl tert-butyl ether, and the operating conditions of the rectifying tower are as follows: the tower top temperature is 60 ℃, the tower top pressure is 0.60MPa, the reflux ratio is 1.4:1, and the lateral line is opened on the 10 th tower plate (from bottom to top) of the catalytic rectifying tower. The sulfur content of the treated methyl tert-butyl ether is less than 1 ppm.
Example 7
The test was carried out on a catalytic distillation unit, starting material: methyl tert-butyl ether containing 600ppm of sulfur, the operating conditions of the rectification column were: the tower top is 55 ℃, the pressure of the tower top is 0.62MPa, the reflux ratio is 1.0:1, and the side line is opened on the 7 th tower plate (from bottom to top) of the catalytic rectifying tower. The sulfur content of the treated methyl tert-butyl ether is less than 1 ppm.
Claims (4)
1. A methyl tert-butyl ether desulfurization process is characterized by comprising the following specific steps:
a) a side draw-out port is arranged at the gas phase zone of the 5 th-10 th tower plate from bottom to top of the catalytic distillation tower, and gas phase methyl tert-butyl ether is drawn out;
b) the extracted methyl tert-butyl ether enters a hydrocyclone separator, micro liquid drops possibly carried are separated out after the separation by the hydrocyclone separator, and the liquid returns to the bottom of the tower under the self-pressure of gravity;
c) the gas-phase methyl tert-butyl ether is sent out of the device through the original heat exchanger, cooler and regulating valve;
d) sulfur-containing heavy components from the bottom of the catalytic distillation tower can be desulfurized in a hydrofining device;
the operation conditions of the catalytic distillation tower are that the temperature of the tower top is 50-60 ℃, the pressure is 0.60-0.70MPa, and the reflux ratio is 1:1-2: 1.
2. The process for desulfurizing methyl tert-butyl ether according to claim 1, wherein the methyl tert-butyl ether to be desulfurized is prepared from a catalytic liquefied gas, a coker liquefied gas or a catalytic and coker mixed liquefied gas, and has a sulfur content of 10ppm to 3000 ppm.
3. The methyl tert-butyl ether desulfurization process according to claim 1 or 2, characterized in that the apparatus for realizing the process comprises a catalytic distillation column and a hydrocyclone, wherein the catalytic distillation column is connected with the hydrocyclone through a side draw line and the bottom of the hydrocyclone is connected with the bottom of the catalytic distillation column.
4. The methyl tert-butyl ether desulfurization process according to claim 3, wherein the side draw is disposed in a gas phase zone of the 5 th to 10 th tray from the bottom up of the catalytic distillation tower.
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| CN104370709A (en) * | 2014-10-15 | 2015-02-25 | 洛阳智达石化工程有限公司 | Method for reducing sulfur content in methyl tert-butyl ether and device thereof |
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| CN104370709A (en) * | 2014-10-15 | 2015-02-25 | 洛阳智达石化工程有限公司 | Method for reducing sulfur content in methyl tert-butyl ether and device thereof |
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