WO2010130214A1 - 两段式二甲醚生产方法 - Google Patents
两段式二甲醚生产方法 Download PDFInfo
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- WO2010130214A1 WO2010130214A1 PCT/CN2010/072714 CN2010072714W WO2010130214A1 WO 2010130214 A1 WO2010130214 A1 WO 2010130214A1 CN 2010072714 W CN2010072714 W CN 2010072714W WO 2010130214 A1 WO2010130214 A1 WO 2010130214A1
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- methanol
- reactor
- stage
- reaction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
-
- 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
Definitions
- the invention relates to the field of ether production process, in particular to a method for producing dimethyl ether. Background technique
- the existing methanol gas phase process for producing dimethyl ether is as follows: After the methanol is heated by a vaporizer or a vaporization tower, it is introduced into a reactor containing the same catalyst for dehydration reaction. The reaction product is separated and purified by entering a fine condensate system to obtain a dimethyl ether product.
- CN1036199A discloses a method for producing dimethyl ether.
- the methanol is heated and vaporized into the reactor through a heat exchanger, and in the presence of a y-Al 2 O 3 catalyst, the gas phase methanol is catalytically dehydrated, and the dehydrated product enters the fine column. Separation, and then a pure dimethyl ether product will be produced on a certain tray of the column, and impurities having a boiling point between methanol and dimethyl ether are also extracted as a side line from a certain tray.
- CN1562927A Another method for producing dimethyl ether is disclosed in CN1562927A, in which the feedstock methanol is all passed from the top to the vaporization column where it is vaporized and separated.
- the methanol vapor from the top of the vaporization tower enters the reactor for dehydration reaction, and the reaction product enters the fine column to be separated and purified to obtain a dimethyl ether product.
- the object of the present invention is to provide a dimethyl ether production process with high methanol conversion rate, good selectivity, low energy consumption, low investment, and reasonable heat distribution and utilization.
- the present invention provides a methanol dehydration catalyst having the following composition and a process for the preparation thereof.
- the catalyst is an active catalyst at a high temperature, and generally adopts a catalyst similar to that described in CN2006101034369.
- the composition of the components of the finished catalyst is: A1 2 0 3 : 35 ⁇ 95%; Si0 2 : l ⁇ 50% ; La: 0. l 5%; Ce: 0. 1 ⁇ 5%; Ca: 0. l ⁇ 3%; Mg: 0. l ⁇ 3%; Na: 0. 01 ⁇ 1%; K: 0. 01 ⁇ : L%.
- the last washing is washed with a solution containing Na, K in the above metering amount, preferably sodium nitrate, sodium carbonate or sodium hydroxide solution, and the filter cake is shaped, dried, and calcined to obtain a finished catalyst.
- a solution containing Na, K in the above metering amount preferably sodium nitrate, sodium carbonate or sodium hydroxide solution
- the present invention provides a two-stage methanol dehydration catalyst having the following composition, and a preparation method thereof can be referred to a catalyst preparation method.
- the two-stage reactor is charged with a low-temperature and high-activity catalyst, and the reaction temperature is 150 to 240 ° C, preferably 180 to 220 ° C, the methanol conversion rate is up to 85 to 92%, and the dimethyl ether selectivity is 99%. 5 ⁇ 5% ⁇
- the composition of the composition of the catalyst is: alumina 30 ⁇ 80%, silicon oxide 20 ⁇ 60%, cerium oxide 0. 5 ⁇ 5%, cerium oxide 0. 5 ⁇ 5%.
- the filter cake is shaped, dried, and calcined to obtain a finished catalyst.
- the aluminum salt solution may be prepared from a soluble salt of aluminum trichloride, aluminum sulfate, aluminum nitrate or aluminum (for example, sodium aluminate solution) to contain aluminum ⁇ 6%
- rt Solution A preferred is aluminum trichloride
- solution B can be prepared from a soluble salt containing La, Ce, Ca, Mg in a catalyst preparation; preferably a nitrate solution or hydrochloride containing La, Ce, Ca, Mg
- the solution B in the preparation of the two-stage methanol dehydration catalyst, the solution B may be prepared from a soluble salt containing La, Ce; preferably one or more of a nitrate solution or a hydrochloride solution containing La, Ce
- the solution C in the preparation of the one-stage and two-stage methanol dehydration catalysts can be obtained from a soluble silicate such as water glass.
- the catalyst for the production of dimethyl ether is a high-temperature active catalyst.
- the conversion of methanol is 70% ⁇ 80%.
- the second stage catalyst is a low temperature catalyst.
- the conversion rate reaches 85% ⁇ 92% at the appropriate temperature, but the reaction Higher temperature When the side reaction increases, the selectivity is poor.
- the present invention employs two reactors in series, one reactor is charged with a high temperature active catalyst, and the second reactor is charged with a low temperature high activity catalyst.
- the raw material methanol is heated and vaporized, and then heated to 150 ⁇ 240 °C to enter a reactor to participate in the reaction.
- a reactor reaction gas is cooled to 180 ⁇ 200 °C, and then enters the second stage reactor for further reaction.
- the second-stage reactor reaction gas is cooled by heat exchange and then enters the fine condensate tower to separate the dimethyl ether product.
- Process 1 The methanol with high methanol content is usually in Process 1.
- the methanol content of the raw material is 8 ( ⁇ 1% or more, and the process 1 is used.
- the methanol content of the raw material methanol is 90 wt ⁇ 3 ⁇ 4 or more, and the process 1 is used, and most preferably 95 ⁇ 99.99 ⁇ 3 ⁇ 4 (wt)
- methanol heating gasification and reaction of a reactor and a two-stage reactor to form a gas cooling process is as follows: Two methanols are separated from the feedstock, and the stream (2) is refluxed as a methanol fines recovery tower.
- the liquid is fed from the top of the methanol refined recovery tower, and the ratio of the total flow mass of the stream (2) to the raw material methanol is (0. 05 ⁇ 1): 1, preferably a stream of about 50% of the raw material quality (2) enters The recovery tower (3), the other one reacts with the outlet of the second-stage reactor to generate gas (13), performs primary heat exchange in the heat exchanger (4), and then reacts with a reactor to generate gas (10) in the heat exchanger. (5) Perform secondary heat exchange, while cooling a reactor to generate gas to 180 ° C ⁇ 200 ° C.
- Process 2 The methanol content of the raw material methanol is 50 ⁇ 95% (wt), preferably 50 ⁇ 80% (wt).
- the gas cooling process is carried out by the process 2, heating and gasification of methanol and the reaction of a reactor and a two-stage reactor.
- the raw material methanol is first reacted with the second-stage reactor to generate gas (13) for first-stage heat exchange in the heat exchanger (4), and then with the first reaction to form gas (10) for secondary heat exchange in the heat exchanger (5).
- a reactor is cooled to generate gas to 180 ° C ⁇ 200 ° C, and then two stages of reaction gas generation gas ( 13 ) in the heat exchanger (6) for three-stage heat exchange, and then into the recovery tower (3) purification,
- the gas phase methanol condensed at the top of the recovery tower is reacted with the reaction gas from the reactor (10) to exchange heat in the heat exchanger (9) to 150 ° C to 240 ° C, and enters a reactor to react with methanol to form dimethyl ether.
- a reaction reaction gas (10) is cooled by heat exchange to 180 ° C ⁇ 200 ° C, into Into the second stage reactor to continue to deepen the reaction.
- the reactor methanol inlet temperature of the reactor of the present invention is 150 ° C to 240 ° C, and the temperature of the reactor is reacted to generate gas into the second reactor at a temperature of 180 ° C to 200 ° C.
- the methanol conversion rate of a reaction can reach 70% ⁇ 80%.
- the methanol conversion rate of the second-stage reaction can reach 85 % ⁇ 92%, and the selectivity of dimethyl ether can be more than 99.9%.
- the one-stage reactor and the two-stage reactor of the present invention may both be adiabatic reactors or both heat exchange reactors; one may be an adiabatic reactor and the other may be a heat exchange reactor.
- reaction gas and methanol are passed through the cascade heat exchange, and the heat is rationally distributed and utilized. More than 95% of the heat is absorbed by methanol.
- FIG. 1 shows the process flow 1
- FIG. 1 shows the process flow 2
- 1-raw material methanol 3-recovery tower; 4, 5, 6, 9-heat exchanger; 8-recovery tower top methanol vapor; 10-stage reaction gas generation; 11-stage reactor; 12-two Stage reactor; 13-two-stage reaction to generate gas; 14-fine tower.
- Example 1 Two-stage methanol dehydration catalyst and preparation method thereof
- the finished catalyst was charged to a two-stage fixed bed reactor, and the catalyst was placed in a constant temperature zone of the reactor, and a stainless steel mesh and quartz sand were used as a support.
- the mass velocity of the reactants is controlled to be 0.5 to 10 h - the optimum mass space velocity is 2 to 5 h - the reactor temperature is 180 to 220 ° C; the reaction pressure is 0.5 to 2 MPa, preferably 0.8 to 1 MPa.
- the reaction product was analyzed by gas chromatography, and the methanol conversion was 90.2%, and the selectivity of dimethyl ether was 99.2%.
- Example 2 Two-stage methanol dehydration catalyst and preparation method thereof
- the catalyst application conditions were the same as those in Example 1.
- the reaction product was analyzed by gas chromatography, and the methanol conversion rate was 87.6%, and the selectivity of dimethyl ether was 99.6%.
- Example 3 Two-stage methanol dehydration catalyst and preparation method thereof
- Example 4 Production of dimethyl ether according to process 1
- 1000 kg of the catalyst is produced as a two-stage reaction catalyst, and the catalyst described in CN2006101034369 is a catalyst.
- the mass percentage of each component of the catalyst is: alumina 80-90%, silicon oxide 10-15%, cerium oxide 0.5 ⁇ 5%, yttrium oxide 0.5 ⁇ 5%, while containing a small amount of Ca, Mg, Na, K, etc.
- the raw material methanol concentration is 99.5% (wt), and the flow rate is 2000kg/h.
- the raw material methanol is divided into two (1) and (2), the ratio of the total flow mass of the stream (2) and the raw material methanol is 0.05: 1, the stream (2) enters the recovery tower (3), the recovery tower (3) operating pressure 0.8 MPa.
- the stream (1) is exchanged with the reaction product gas through the heat exchangers (4), (5), and (6), vaporized by the vaporizer (7), and then merged with the top steam (8) of the recovery tower, after confluence Methanol vapor is reacted by a reactor outlet to form gas (10).
- a reactor outlet to form gas (10) After heating to 150 ° C ⁇ 240 ° C, enter a reactor (11) to participate in the reaction to form dimethyl ether, a reactor (11) operating temperature of 260 ° C ⁇ 360 ° C, operating pressure 0.8 MPa.
- a reactor outlet reaction product gas (10) is passed through heat exchangers (9) and (5) and is cooled by heat exchange with methanol to 180 ° C ⁇ 200 ° C and then enters the second stage reactor (12), the second stage reactor operating temperature 180 ° C ⁇ 220 ° C, operating pressure 0.8MPa.
- the two-stage reactor reaction gas (13) is cooled by heat exchange between the heat exchangers (6) and (4), and enters the fine column (14) from the middle of the fine column, and the dimethyl ether product is obtained from the top of the column.
- the Tata kettle liquid enters the recovery tower to recover methanol therefrom.
- the concentration of dimethyl ether product is 99%.
- the conversion rate of methanol is 90%.
- Example 5 Production of dimethyl ether according to process flow 1
- the methanol concentration of the raw material is 95%, and the ratio of the total flow mass of the stream (2) to the raw material methanol is 0.2: 1, a reactor operating temperature of 260 ° C to 360 ° C, and an operating pressure of 1.0 MPa.
- the two-stage reactor operating temperature is 180 ° C ⁇ 220 ° C, operating pressure 1.0 MPa.
- the concentration of dimethyl ether product is 99%, and the conversion rate of methanol per pass after passing through a reactor and a two-stage reactor is 90%.
- the methanol concentration of the raw material is 90%, the ratio of the total flow mass of the stream (2) and the raw material methanol is 0.5: 1, the reactor operating temperature is 260 ° C to 360 ° C, and the operating pressure is 1.0 MPa.
- the two-stage reactor operating temperature is 180 ° C ⁇ 220 ° C, operating pressure 1.0 MPa.
- the concentration of dimethyl ether product is 99%, and the conversion rate of methanol per pass after passing through a reactor and a two-stage reactor is 90%.
- Example 7 Production of dimethyl ether according to process flow 1
- the methanol concentration of the raw material is 80%, the ratio of the total flow mass of the stream (2) and the raw material methanol is 0.9: 1, the reactor operating temperature is 260 ° C to 360 ° C, and the operating pressure is 1.0 MPa.
- the two-stage reactor has an operating temperature of 180 ° C to 220 ° C and an operating pressure of 1.0 MPa.
- the concentration of dimethyl ether product is 99%. After one-stage reactor and two-stage reactor, the conversion rate of methanol is 90%.
- Example 8 Production of dimethyl ether according to process 2
- the raw material methanol concentration is 92% (wt), and the flow rate is 2000kg/h.
- the raw material methanol is exchanged with the reaction product gas through the heat exchangers (4), (5), and (6), and then enters the recovery tower (3), and the top portion of the recovery tower is partially condensed, and the gasification methanol vapor is collected at the top of the recovery tower (8) ) is formed by a reactor outlet reaction gas (10) heated to 150 ° C ⁇ 240 ° C, into a reactor (11) to participate in the reaction to form dimethyl ether, a reactor operating temperature of 260 ° C ⁇ 360 ° C, The operating pressure is 0.6 MPa.
- a reactor outlet reaction product gas is passed through heat exchangers (9) and (5) and is cooled by heat exchange with methanol to 180 ° C ⁇ 200 ° C and then enters the second stage reactor ( 12), the second stage reactor operating temperature is 180 ° C ⁇ 220 ° C, operating pressure 0.6MPa.
- the two-stage reactor reaction gas (13) is cooled by heat exchange between the heat exchangers (6) and (4) and the raw material methanol, and enters the fine tower (14) from the middle of the fine tower, and the dimethyl ether product is obtained from the top of the tower.
- the turret liquid into the recovery tower recovers methanol.
- the concentration of dimethyl ether product was 99%, and the conversion rate of methanol per pass after passing through a reactor and a two-stage reactor was 92%.
- the methanol concentration of the raw material is 60%
- the reactor operating temperature is 260 ° C to 360 ° C
- the operating pressure is 1.2 MPa.
- the operating temperature of the two-stage reactor is 180 ° C ⁇ 220 ° C, and the operating pressure is 1.2 MPa.
- the concentration of dimethyl ether product was 99 ⁇ 3 ⁇ 4, and the conversion rate of methanol per pass after passing through a reactor and a two-stage reactor was 92%.
- the methanol concentration of the raw material is 80%
- the reactor operating temperature is 260 ° C to 360 ° C
- the operating pressure is 1.2 MPa.
- the operating temperature of the two-stage reactor is 180 ° C ⁇ 220 ° C, and the operating pressure is 1.2 MPa.
- the concentration of dimethyl ether product was 99 ⁇ 3 ⁇ 4, and the conversion rate of methanol per pass after passing through a reactor and a two-stage reactor was 92%.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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IL215689A IL215689A (en) | 2009-05-15 | 2011-10-11 | Two-step method in two reactors for the preparation of dimethyl ether |
EG2011111858A EG27019A (en) | 2009-05-15 | 2011-11-02 | Method for two-stage production of dimethyl ether |
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CN200910084410.8 | 2009-05-15 | ||
CN200910084410.8A CN101550067B (zh) | 2009-05-15 | 2009-05-15 | 两段式二甲醚生产方法 |
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EG (1) | EG27019A (zh) |
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CN101891597A (zh) * | 2010-07-05 | 2010-11-24 | 杨奇申 | 一种具有多级反应的二甲醚生产方法 |
CN104588102B (zh) * | 2013-11-03 | 2017-01-25 | 中国石油化工股份有限公司 | 一种甲醇脱水生产二甲醚催化剂的制备方法 |
CN104591977B (zh) * | 2013-11-03 | 2016-05-18 | 中国石油化工股份有限公司 | 甲醇脱水制二甲醚的方法 |
CN105037109A (zh) * | 2015-08-11 | 2015-11-11 | 鹤壁宝发能源科技股份有限公司 | 一种中温串低温的二甲醚生产方法 |
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CN1907932A (zh) * | 2005-08-04 | 2007-02-07 | 中国科学院大连化学物理研究所 | 一种由甲醇生产二甲醚的方法 |
CN100366597C (zh) * | 2006-07-21 | 2008-02-06 | 新奥新能(北京)科技有限公司 | 新型二甲醚生产工艺 |
CN100379491C (zh) * | 2006-07-21 | 2008-04-09 | 新奥新能(北京)科技有限公司 | 一种甲醇脱水制二甲醚用催化剂及其制备方法 |
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CN1043343C (zh) * | 1995-10-13 | 1999-05-12 | 化学工业部西南化工研究院 | 由甲醇生产二甲醚的方法 |
KR100629939B1 (ko) * | 2004-10-15 | 2006-09-28 | 에스케이 주식회사 | 단열반응기에서 미정제 메탄올로부터 디메틸에테르의제조방법 |
CN100567238C (zh) * | 2007-08-17 | 2009-12-09 | 沈建冲 | 一种制备二甲醚的方法 |
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CN1907932A (zh) * | 2005-08-04 | 2007-02-07 | 中国科学院大连化学物理研究所 | 一种由甲醇生产二甲醚的方法 |
CN100366597C (zh) * | 2006-07-21 | 2008-02-06 | 新奥新能(北京)科技有限公司 | 新型二甲醚生产工艺 |
CN100379491C (zh) * | 2006-07-21 | 2008-04-09 | 新奥新能(北京)科技有限公司 | 一种甲醇脱水制二甲醚用催化剂及其制备方法 |
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EG27019A (en) | 2015-04-01 |
CN101550067B (zh) | 2013-03-20 |
CN101550067A (zh) | 2009-10-07 |
IL215689A0 (en) | 2012-01-31 |
IL215689A (en) | 2015-03-31 |
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