CN103739455A - Technology for preparing dimethyl ether by performing gas-phase catalytic dehydration on methanol - Google Patents
Technology for preparing dimethyl ether by performing gas-phase catalytic dehydration on methanol Download PDFInfo
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- CN103739455A CN103739455A CN201310728700.8A CN201310728700A CN103739455A CN 103739455 A CN103739455 A CN 103739455A CN 201310728700 A CN201310728700 A CN 201310728700A CN 103739455 A CN103739455 A CN 103739455A
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- methanol
- gas
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- methyl 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
- C07C41/09—Preparation of ethers by dehydration of compounds containing hydroxy groups
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- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a technology for preparing dimethyl ether by performing gas-phase catalytic dehydration on methanol. The technology is implemented by the following steps: pressurizing and metering methanol serving as a raw material in a circular methanol storage tank by using a methanol feed pump, exchanging heat with reaction gas in a methanol heat exchanger, introducing into a methanol vaporization tower, heating a vaporization tower reboiler with heat conducting oil, exchanging heat of vaporized vapor-phase methanol with reaction gas through a gas heat exchanger, and introducing the heat-exchanged vapor-phase methanol into a reactor at two segments; indirectly cooling a crude methyl ether condenser with cooling water; introducing a material discharged from the crude methyl ether condenser into a crude methyl ether storage tank for undergoing gas-liquid separation to form crude methyl ether serving as a liquid phase and hydrogen serving as a gas phase, introducing the gas-phase material into a washing tower, absorbing DME (Dimethyl Ether) in the gas-phase material by using a methanol aqueous solution from a rectifying tower kettle, pressuring and metering the crude methyl ether discharged from the crude methyl ether storage tank by using a rectifying tower feed pump, and introducing into a rectifying tower. A DEM product is obtained by rectifying and separating from the upper part of the tower, is placed into product storage tanks after being metered in product metering tanks, and is sold by being pumped into a tank car.
Description
Technical field
The present invention relates to chemical technology field, is exactly a kind of preparing dimethyl ether through catalytic dehydration of gas-phase methanol technology.
Background technology
In recent years, China increases sharply to the degree of dependence of oil, development oil substitutes, and exploitation clean energy becomes the important selection of energy strategy.The dme as an alternative energy fades in advantage, has obtained the extensive attention of countries in the world.
Dme is the renewable new forms of energy of a kind of internationally recognized green, and environmental protection is free from environmental pollution, cheap stable, is listed in one of State Scientific and Technological Commission's key popularized project.As its accumulating of domestic fuel gas, combustion safety; the performance index such as premix gas calorific value and theoretical combustion temperature are all better than liquefied petroleum gas (LPG); can be used as the peak regulation gas of Town Gas; liquefied gas mixed gas; dme has obtained each enterprise operators' such as Shandong, Jiangsu trust; more obtain consumers in general and generally accepted approval; the application of this technology; can enterprise competitive power; improve Business Economic Benefit; fill up petroleum resources shortage and protection of the environment, there is important economic implications and strategic importance.
Producing at present dme conventional art has:
(1) sulfuric acid process: the principal feature of this technique is reaction conditions gentleness, and methyl alcohol per pass conversion is high, can intermittently or continuously produce, but equipment corrosion is serious, and raffinate and waste water environmental pollution are serious, operational condition harshness, and product aftertreatment is more difficult.
(2) direct synthesis of dimethyl ether from synthesis gas: this technique is actually a synthesizing methanol and methanol dehydration two-step reaction and is incorporated in a reactor and carries out, but the research of synthetic gas method preparing dimethy ether is under test at present, successfully do not develop large-scale industrialization device, this technology is still immature at present.
Summary of the invention
Production technique of the present invention is as follows:
Production principle:
Methyl alcohol, under catalyst action, is produced DME, and its reaction formula is as follows:
Main reaction: 2CH3OH=CH3OCH3+H2O
△H573
。K=-22.17kj/mol
Side reaction: CH3OH=CO+2H2
CH3OCH3=CH4+H2+CO
CO+H2O=CO2=H2
Catalytic dehydration of methanol reaction method synthesizes DME, comprises material benzenemethanol vaporization, dehydration reaction, condensation washing, rectification and purification.
Advantage of the present invention is:
(1) adopt this technique, raw materials consumption is low, and reaction conditions gentleness is produced and carried out continuously, easily be automated, and constant product quality, there is stronger competitive capacity.
(2) reactor adopts multistage condensing fixed bed, and catalyst loading capacity is large, invests lowly, and temperature of reaction is suitable, and side reaction is few, is easy to maximize.
(3) unique vaporization tower structure and separating technology, both simple flow, minimizing investments, by effectively reducing steam consumption.The steam consumption of product dme per ton is than the low 0.5-1.5 ton of domestic and international similar technology.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Catalytic dehydration of methanol reaction method synthesizes DME, comprises material benzenemethanol vaporization, dehydration reaction, condensation washing, rectification and purification; Material benzenemethanol in recycle methanol basin, with after the metering of methanol feeding pump pressurization degree, with reaction gas heat exchange, then enters methyl alcohol vaporizing tower in heat exchange of methanol device, vaporization tower reboiler heat-conducting oil heating.
Vapour phase methyl alcohol after vaporization divides two sections and enters reactor after gas heat exchanger and reaction gas heat exchange; One is superheated to 240
oc, enters reactor from top and reacts; Another strand is heated to 145
oc, enters reactor as quench gas from the top of catalyst layer.From reactor reactant gases out, after interchanger and methanol steam heat exchange, enter thick methyl ether condenser.Thick methyl ether condenser is indirectly cooling with water coolant.
From thick methyl ether condenser material out, enter thick methyl ether basin and carry out gas-liquid separation.Liquid phase is thick methyl ether, and gas phase is non-condensable gases and the DME steam such as hydrogen, carbon monoxide.Gaseous phase materials enters washing tower and uses from the methanol aqueous solution of tower bottom of rectifying tower and absorb the DME reclaiming wherein, and absorption liquid returns to thick methyl ether basin, absorbs tail gas and goes boiler as fuel combustion.
From thick methyl ether basin thick methyl ether out with rectifying tower fresh feed pump, pressurize and measure enter rectifying tower.Through rectifying separation, from tower top, obtain DME product, DME product is put into product storage tank after measuring in ganging of products tank.Product DME by selling outside after pumping tank car.
Rectifying tower reboiler heat-conducting oil heating, tower top material is used water quench in rectifying tower condenser.Rectifying tower bottoms enters rectifying tower bottoms basin, delivers to after metering methyl alcohol vaporizing system and washing tower.
Claims (3)
1. preparing dimethyl ether through catalytic dehydration of gas-phase methanol technology, is characterized in that: Catalytic dehydration of methanol reaction method synthesizes DME, comprises material benzenemethanol vaporization, dehydration reaction, condensation washing, rectification and purification; Material benzenemethanol in recycle methanol basin is with after the metering of methanol feeding pump pressurization degree, in heat exchange of methanol device with reaction gas heat exchange, then enter methyl alcohol vaporizing tower, vaporization tower reboiler heat-conducting oil heating, the vapour phase methyl alcohol after vaporization divides two sections and enters reactor after gas heat exchanger and reaction gas heat exchange; One is superheated to 240
oc, enters reactor from top and reacts; Another strand is heated to 145
oc, enters reactor as quench gas from the top of catalyst layer, enters thick methyl ether condenser from reactor reactant gases out after interchanger and methanol steam heat exchange, and thick methyl ether condenser is indirectly cooling with water coolant; From thick methyl ether condenser material out, enter thick methyl ether basin and carry out gas-liquid separation, liquid phase is thick methyl ether, gas phase is non-condensable gases and the DME steam such as hydrogen, carbon monoxide, gaseous phase materials enters washing tower and uses from the methanol aqueous solution of tower bottom of rectifying tower and absorb the DME reclaiming wherein, absorption liquid returns to thick methyl ether basin, absorb tail gas go boiler as fuel combustion, from thick methyl ether basin thick methyl ether out with rectifying tower fresh feed pump, pressurize and measure enter rectifying tower; Through rectifying separation, from tower top, obtain DME product, DME product is put into product storage tank after measuring in ganging of products tank, and product DME by selling outside after pumping tank car.
2. preparing dimethyl ether through catalytic dehydration of gas-phase methanol technology according to claim 1, is characterized in that: rectifying tower reboiler heat-conducting oil heating, tower top material is used water quench in rectifying tower condenser.
3. preparing dimethyl ether through catalytic dehydration of gas-phase methanol technology according to claim 1, is characterized in that: rectifying tower bottoms enters rectifying tower bottoms basin, delivers to after metering methyl alcohol vaporizing system and washing tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728700.8A CN103739455A (en) | 2013-12-26 | 2013-12-26 | Technology for preparing dimethyl ether by performing gas-phase catalytic dehydration on methanol |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728700.8A CN103739455A (en) | 2013-12-26 | 2013-12-26 | Technology for preparing dimethyl ether by performing gas-phase catalytic dehydration on methanol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103739455A true CN103739455A (en) | 2014-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310728700.8A Pending CN103739455A (en) | 2013-12-26 | 2013-12-26 | Technology for preparing dimethyl ether by performing gas-phase catalytic dehydration on methanol |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103739455A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560807A (en) * | 1983-04-27 | 1985-12-24 | Mitsubishi Chemical Industries, Ltd. | Process for the production of dimethyl ether useful as a propellant |
| CN101195561A (en) * | 2007-12-26 | 2008-06-11 | 成都天成碳一化工有限公司 | Method for producing dimethyl ether with methanol gas-phase dehydration |
| CN101544545A (en) * | 2008-03-27 | 2009-09-30 | 中国石油化工股份有限公司 | Method for producing dimethyl ether from methanol |
| CN102850192A (en) * | 2012-10-11 | 2013-01-02 | 中国天辰工程有限公司 | Method for producing dimethyl ether by carrying out gas-phase dehydration on methanol |
-
2013
- 2013-12-26 CN CN201310728700.8A patent/CN103739455A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4560807A (en) * | 1983-04-27 | 1985-12-24 | Mitsubishi Chemical Industries, Ltd. | Process for the production of dimethyl ether useful as a propellant |
| CN101195561A (en) * | 2007-12-26 | 2008-06-11 | 成都天成碳一化工有限公司 | Method for producing dimethyl ether with methanol gas-phase dehydration |
| CN101544545A (en) * | 2008-03-27 | 2009-09-30 | 中国石油化工股份有限公司 | Method for producing dimethyl ether from methanol |
| CN102850192A (en) * | 2012-10-11 | 2013-01-02 | 中国天辰工程有限公司 | Method for producing dimethyl ether by carrying out gas-phase dehydration on methanol |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140423 |
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| RJ01 | Rejection of invention patent application after publication |