CN112390706A - Methanol synthesis method - Google Patents
Methanol synthesis method Download PDFInfo
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- CN112390706A CN112390706A CN202011175053.9A CN202011175053A CN112390706A CN 112390706 A CN112390706 A CN 112390706A CN 202011175053 A CN202011175053 A CN 202011175053A CN 112390706 A CN112390706 A CN 112390706A
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- Prior art keywords
- methanol
- catalyst
- reactor
- temperature
- reaction product
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 238000001308 synthesis method Methods 0.000 title abstract description 5
- 239000003054 catalyst Substances 0.000 claims abstract description 41
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000003786 synthesis reaction Methods 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- 230000003197 catalytic effect Effects 0.000 claims description 10
- 230000002194 synthesizing effect Effects 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 208000012839 conversion disease Diseases 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
- C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
- C07C29/1516—Multisteps
-
- 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
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Abstract
The invention relates to a methanol synthesis method, which comprises the following steps: 1) reacting a syngas feed at a first temperature in the presence of a first catalyst to produce a first reaction product comprising methanol; 2) reacting the first reaction product at a second temperature in the presence of a second catalyst to produce a second reaction product comprising methanol. The first reactor is carried out at high temperature, and the first catalyst with high conversion rate and high heat-resistant activity is adopted, so that the yield of methanol is improved, the impurity content is reduced, the high-grade steam output can be improved, and the using amount of the catalyst is reduced; the second reactor is carried out at low temperature, and a second catalyst is adopted, so that the higher space-time yield of the catalyst is ensured under the conditions of higher alcohol partial pressure and low driving force; the activity of the catalyst is reduced in the later stage of the reaction, the methanol yield of the first reactor is reduced, the reaction load is transferred to the second reactor, and the two-stage reactors are matched, so that the methanol yield of the whole device is improved.
Description
Technical Field
The invention relates to the technical field of chemical synthesis, in particular to a methanol synthesis method.
Background
At present, the large-scale methanol synthesis technology mainly adopts a two-stage methanol synthesis technology: a water-cooling-gas cooling two-stage methanol synthesis technology and a water-cooling-water cooling two-stage methanol synthesis technology. Wherein, the water-cooling-air cooling two-stage methanol synthesis technology adopts a water-cooling methanol synthesis tower for the first reaction to produce high-grade steam as a byproduct, and adopts an air-cooling methanol synthesis tower for the second reaction, and the reactor has two functions of a heat exchanger and a reactor; the water-cooling-water-cooling two-stage methanol synthesis technology adopts a water-cooling methanol synthesis tower to produce high-grade steam as a byproduct in the first reaction, and adopts a water-cooling methanol synthesis tower to produce low-grade steam as a byproduct in the second reaction.
Although different types are adopted in the two-stage reactor in the existing methanol synthesis reaction, the conversion rate of the product is improved to a certain extent, but the existing two-stage reactor adopts the same catalyst, so that the one-time investment cost is high, the service life of the catalyst is shortened, and byproducts in the later stage of the reaction are increased obviously; moreover, the high alcohol partial pressure at the outlet of the first-stage reactor can inhibit the methanol equilibrium reaction, and the second-stage reactor adopts the same type of catalyst to greatly reduce the reaction conversion rate.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a methanol synthesis method which can improve the conversion rate of the whole methanol synthesis system, reduce the impurity content of products, prolong the service life of a catalyst and reduce the investment and energy consumption of the whole device.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for synthesizing methanol is characterized by comprising the following steps:
1) reacting a syngas feed at a first temperature in the presence of a first catalyst to produce a first reaction product comprising methanol;
2) reacting the first reaction product in the presence of a second catalyst at a second temperature to produce a second reaction product comprising methanol;
wherein the absolute value of the first temperature is A/DEG C, the absolute value of the second temperature is B/DEG C, and A > B; the catalytic activity of the first catalyst is X, the catalytic activity of the second catalyst is Y, and X > Y.
Preferably, the first temperature a is 230-.
Preferably, the catalytic activity X of the first catalyst is 1.2-2.0 t/(m)3h) The catalytic activity Y of the second catalyst is 0.3-1.0 t/(m)3h)。
Preferably, step (1) is carried out in a first reactor, the inlet alcohol partial pressure in the first reactor being between 0.3% and 0.7%, the outlet alcohol partial pressure of the first reactor being between 9% and 15%; and (2) performing in a second reactor, wherein the inlet alcohol partial pressure of the second reactor is 9-15%, and the outlet alcohol partial pressure of the second reactor is 12-20%.
Preferably, the space velocity of the first reactor is 10000-13000 h-1And the space velocity of the second reactor is 13000-19000 h-1。
A method for synthesizing methanol is characterized by comprising the following steps:
1) reacting a synthesis gas raw material at a first temperature in the presence of a first catalyst to generate a first reaction product containing methanol, and detecting the methanol content of the first reaction product to obtain a first methanol content value;
2) reacting the first reaction product at a second temperature in the presence of a second catalyst to produce a second reaction product containing methanol, and detecting the methanol content of the second reaction product to obtain a second methanol content value;
3) the first methanol content at the reaction start time T0 is M0 (mol%), the first methanol content at the time Ti after the reaction starts is Mi (mol%), i is any positive value, and when (M0-Mi)/M0 is greater than 2%, at least a portion of the synthesis gas feedstock is reacted directly at the second temperature in the presence of the second catalyst from the time Ti.
Compared with the prior art, the invention has the advantages that: the first reactor is carried out at high temperature, and the first catalyst with high conversion rate and high heat-resistant activity is adopted, so that the yield of methanol is improved, the impurity content is reduced, the high-grade steam output can be improved, and the using amount of the catalyst is reduced; the second reactor is carried out at low temperature, and a second catalyst is adopted, so that the higher space-time yield of the catalyst is ensured under the conditions of higher alcohol partial pressure and low driving force; the activity of the catalyst is reduced in the later stage of the reaction, the methanol yield of the first reactor is reduced, the reaction load is transferred to the second reactor, and the two-stage reactors are matched, so that the methanol yield of the whole device is improved.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention;
FIG. 2 is a process flow diagram of example 2 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1:
the reaction device of the embodiment comprises a first reactor 1 and a second reactor 2, and the specific structure is consistent with the following process method.
As shown in fig. 1, the method for synthesizing methanol of the present embodiment includes the following steps:
1) the synthesis gas raw material enters a first reactor 1 after being subjected to heat exchange through a gas-gas heat exchanger 3, and reacts at a first temperature in the presence of a first catalyst to generate a first reaction product containing methanol;
a first temperature a of 230 ℃; a second temperature B2005 ℃, and maintaining a > B;
the first reactor 1 produces high-grade steam as a byproduct;
2) enabling the first reaction product to enter a second reactor 2 after heat exchange through a gas-gas heat exchanger 3, and reacting at a second temperature in the presence of a second catalyst to generate a second reaction product containing methanol;
the catalytic activity X of the first catalyst is 1.5 t/(m)3h) The catalytic activity Y of the second catalyst is 0.5 t/(m)3h)。
The inlet alcohol partial pressure in the first reactor 1 is 0.37%, and the outlet alcohol partial pressure in the first reactor 1 is 13%; the inlet partial pressure of alcohol of the second reactor 2 was 13% and the outlet partial pressure of alcohol of the second reactor was 16%. The space velocity of the first reactor 1 is 11000h-1Space velocity of the second reactor 2, 13200h-1。
Example 2:
as shown in fig. 2, the method for synthesizing methanol of this embodiment includes the following steps based on embodiment 1:
1) reacting a synthesis gas raw material at a first temperature in the presence of a first catalyst to generate a first reaction product containing methanol, and detecting the methanol content of the first reaction product to obtain a first methanol content value;
2) reacting the first reaction product at a second temperature in the presence of a second catalyst to produce a second reaction product containing methanol, and detecting the methanol content of the second reaction product to obtain a second methanol content value;
3) the first methanol content at the reaction start time T0 is M0 (mol%), the first methanol content at the time Ti after the reaction starts is Mi (mol%), i is any positive value, and when (M0-Mi)/M0 is greater than 2%, at least a portion of the synthesis gas feedstock is reacted directly at the second temperature in the presence of the second catalyst from the time Ti.
Claims (6)
1. A method for synthesizing methanol is characterized by comprising the following steps:
1) reacting a syngas feed at a first temperature in the presence of a first catalyst to produce a first reaction product comprising methanol;
2) reacting the first reaction product in the presence of a second catalyst at a second temperature to produce a second reaction product comprising methanol;
wherein the absolute value of the first temperature is A/DEG C, the absolute value of the second temperature is B/DEG C, and A > B; the catalytic activity of the first catalyst is X, the catalytic activity of the second catalyst is Y, and X > Y.
2. The method for synthesizing methanol according to claim 1, wherein: the first temperature A is 230-.
3. The method for synthesizing methanol according to claim 1, wherein: the catalytic activity X of the first catalyst is 1.2-2.0 t/(m)3h) The catalytic activity Y of the second catalyst is 0.3-1.0 t/(m)3h)。
4. The method for synthesizing methanol according to claim 1, wherein: the step (1) is carried out in a first reactor, the inlet alcohol partial pressure in the first reactor is 0.3-0.7%, and the outlet alcohol partial pressure in the first reactor is 9-15%; and (2) performing in a second reactor, wherein the inlet alcohol partial pressure of the second reactor is 9-15%, and the outlet alcohol partial pressure of the second reactor is 12-20%.
5. The method for synthesizing methanol according to claim 4, wherein: the airspeed of the first reactor is 10000-13000 h-1And the space velocity of the second reactor is 13000-19000 h-1。
6. A method for synthesizing methanol is characterized by comprising the following steps:
1) reacting a synthesis gas raw material at a first temperature in the presence of a first catalyst to generate a first reaction product containing methanol, and detecting the methanol content of the first reaction product to obtain a first methanol content value;
2) reacting the first reaction product at a second temperature in the presence of a second catalyst to produce a second reaction product containing methanol, and detecting the methanol content of the second reaction product to obtain a second methanol content value;
3) the first methanol content at the reaction start time T0 is M0, the first methanol content at the time Ti after the reaction starts is Mi, i is an arbitrary positive value, and when (M0-Mi)/M0 is greater than 2%, at least a portion of the synthesis gas feed is reacted directly at the second temperature in the presence of the second catalyst from the time Ti.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011175053.9A CN112390706A (en) | 2020-10-28 | 2020-10-28 | Methanol synthesis method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011175053.9A CN112390706A (en) | 2020-10-28 | 2020-10-28 | Methanol synthesis method |
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| CN112390706A true CN112390706A (en) | 2021-02-23 |
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| CN202011175053.9A Pending CN112390706A (en) | 2020-10-28 | 2020-10-28 | Methanol synthesis method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107216236A (en) * | 2017-04-28 | 2017-09-29 | 中石化宁波工程有限公司 | Low pressure methanol synthesis method |
| CN107382665A (en) * | 2017-07-13 | 2017-11-24 | 南京国昌化工科技有限公司 | The technique and device of a kind of methanol-fueled CLC |
| CN109111342A (en) * | 2018-09-30 | 2019-01-01 | 中石化宁波工程有限公司 | A kind of water cooling methanol synthesizing process |
| CN110272328A (en) * | 2019-06-14 | 2019-09-24 | 中石化宁波工程有限公司 | A kind of adjusting method and regulating device of system for methanol synthesis |
-
2020
- 2020-10-28 CN CN202011175053.9A patent/CN112390706A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107216236A (en) * | 2017-04-28 | 2017-09-29 | 中石化宁波工程有限公司 | Low pressure methanol synthesis method |
| CN107382665A (en) * | 2017-07-13 | 2017-11-24 | 南京国昌化工科技有限公司 | The technique and device of a kind of methanol-fueled CLC |
| CN109111342A (en) * | 2018-09-30 | 2019-01-01 | 中石化宁波工程有限公司 | A kind of water cooling methanol synthesizing process |
| CN110272328A (en) * | 2019-06-14 | 2019-09-24 | 中石化宁波工程有限公司 | A kind of adjusting method and regulating device of system for methanol synthesis |
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Application publication date: 20210223 |
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