CN113443989A - Coupling CO2Method for synthesizing dimethyl carbonate and co-producing ethylene glycol - Google Patents
Coupling CO2Method for synthesizing dimethyl carbonate and co-producing ethylene glycol Download PDFInfo
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- CN113443989A CN113443989A CN202110726760.0A CN202110726760A CN113443989A CN 113443989 A CN113443989 A CN 113443989A CN 202110726760 A CN202110726760 A CN 202110726760A CN 113443989 A CN113443989 A CN 113443989A
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 title claims abstract description 207
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 230000002194 synthesizing effect Effects 0.000 title claims abstract description 11
- 230000008878 coupling Effects 0.000 title claims description 8
- 238000010168 coupling process Methods 0.000 title claims description 8
- 238000005859 coupling reaction Methods 0.000 title claims description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 123
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 93
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 92
- 238000000034 method Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000003245 coal Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000007670 refining Methods 0.000 claims abstract description 5
- 239000002253 acid Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 102
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 33
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 27
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 18
- 239000001569 carbon dioxide Substances 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 11
- 238000002309 gasification Methods 0.000 claims description 8
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 claims description 6
- LOMVENUNSWAXEN-UHFFFAOYSA-N Methyl oxalate Chemical compound COC(=O)C(=O)OC LOMVENUNSWAXEN-UHFFFAOYSA-N 0.000 claims description 6
- BLLFVUPNHCTMSV-UHFFFAOYSA-N methyl nitrite Chemical compound CON=O BLLFVUPNHCTMSV-UHFFFAOYSA-N 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000007086 side reaction Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000035425 carbon utilization Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000007798 antifreeze agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000029305 taxis Effects 0.000 description 1
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- 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
- C07C29/128—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by alcoholysis
- C07C29/1285—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by alcoholysis of esters of organic acids
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C68/00—Preparation of esters of carbonic or haloformic acids
- C07C68/04—Preparation of esters of carbonic or haloformic acids from carbon dioxide or inorganic carbonates
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C68/00—Preparation of esters of carbonic or haloformic acids
- C07C68/08—Purification; Separation; Stabilisation
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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
- Y02P20/141—Feedstock
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a coupled CO2The method for synthesizing dimethyl carbonate and co-producing ethylene glycol is characterized by that after the raw material coal is gasified to obtain crude synthesis gas, the processes of water gas conversion, acid gas removal, methanol synthesis, dimethyl carbonate synthesis, ethylene glycol synthesis, dimethyl carbonate refining and ethylene glycol refining are passed through so as to implement the co-production of dimethyl carbonate and ethylene glycol. Compared with the traditional process for preparing ethylene glycol from coal, the method recycles CO2Remarkably reduce CO2The carbon utilization efficiency, the energy efficiency and the channel of the system are improvedEconomic benefit.
Description
Technical Field
The invention belongs to the technical field of energy and chemical industry, and particularly relates to coupled CO2A method for synthesizing dimethyl carbonate and co-producing ethylene glycol.
Background
Ethylene Glycol (EG) is considered to be a strategic chemical basic material and chemical intermediate, and has a huge downstream market scale, and is widely used in many fields such as surfactants, antifreeze agents, plasticizers, and the like as a bulk commodity, mainly for supplying raw materials for the polyester industry. By 2019, the global total ethylene glycol production capacity reaches 3969 million tons per year, the annual ethylene glycol production exceeds 2500 million tons, and the demand for ethylene glycol is expected to increase at a rate of 5% per year. The rapid development of the industry has promoted a wide ethylene glycol consumption market, and the ethylene glycol consumption capacity in 2015 in China reaches 1315 ten thousand tons, which accounts for more than half of the global consumption level (53%). Currently, ethylene glycol is produced mainly by the petroleum route, by the epoxidation of ethane and subsequent hydrolysis of ethylene oxide, but this process has a low ethylene oxide yield, high technical production costs, high energy consumption and low efficiency. The natural resource of China is rich coal, oil and gas, the reserve of coal resource accounts for 11.6% of the total reserve of coal in the world, and the reserve of petroleum and natural gas only accounts for 2.4% and 1.2% of the total reserve of coal in the world respectively. The ethylene glycol capacity of China is increased from 139 ten thousand tons to 1120.5 ten thousand tons in 2005-2019, wherein the contribution increment of coal-made ethylene glycol is 483 ten thousand, which accounts for 37.68% of the total ethylene glycol capacity. In recent years, more than half of the national programs are put into ethylene glycol building projects, namely, ethylene glycol prepared from coal.
The most obvious advantage of the process for preparing the ethylene glycol from the coal is that abundant coal resources are utilized, and the process is simple. But H of synthesis gas in the traditional process of preparing ethylene glycol from coal2the/CO ratio (0.3-0.8), much lower than that required for ethylene glycol production (about 2.0), therefore water gas shift is equipped to adjust the hydrogen to carbon ratio, resulting in many valuable CO gases being converted to CO in the water gas shift2. For example CO of a process for producing ethylene glycol from natural coal2The discharge is about 3.2t/t-EGThe high emission of carbon dioxide results in a serious loss of carbon resources, which would greatly impair economic advantages if carbon dioxide taxes were considered. In addition, the byproduct dimethyl carbonate in the traditional process is not taken into consideration as a product with economic benefit all the time, so that the resource loss and the economic benefit reduction are caused.
On the other hand, the conversion and utilization of carbon dioxide have received great attention not only because carbon dioxide has an influence on global climate change but also carbon dioxide can be reused as an important carbon resource for fuel and chemical synthesis. The reaction of methanol and carbon dioxide to produce dimethyl carbonate is a practical process.
In conclusion, in order to improve the carbon utilization efficiency, the energy efficiency and the economic benefit in the traditional process of preparing ethylene glycol from coal, the invention provides a coupling CO2The technology for coproducing the synthesis gas and the ethylene oxide to prepare the ethylene glycol and the dimethyl carbonate can effectively utilize the carbon dioxide as a reactant to produce synthesis gas and chemicals, realize advantage complementation and improve the economic benefit of a system, and is one of the choices with the most scientific prospect.
Disclosure of Invention
The traditional technology for preparing ethylene glycol from coal has the problems of low carbon utilization efficiency, high water consumption, large carbon dioxide emission and the like, and the invention provides a coupling CO for effectively solving the series of problems2The method for synthesizing dimethyl carbonate and co-producing ethylene glycol aims at improving the carbon utilization efficiency, the energy efficiency and the economic benefit of the process.
In order to achieve the purpose, the invention adopts the following technical scheme:
coupling CO2The method for synthesizing dimethyl carbonate and coproducing ethylene glycol comprises the following steps:
s1: raw material coal gasification for preparing crude synthesis gas
Crushing and screening the dried raw material coal, and then carrying out gasification reaction (at the high temperature of 1300-1500 ℃, the pressurization of 2.7-6.5 MPa and with oxygen as a gasification agent) to obtain the H2CO and CO2The raw synthesis gas (H in the raw synthesis gas) is mainly2The molar ratio of the carbon dioxide to CO is 0.3-0.8);
s2: raw syngas water gas shift
Subjecting a portion of the raw syngas produced in step S1 to water gas shift to convert CO and H2Reaction of O to H2And CO2(ii) a Mixing the raw synthesis gas after water gas shift with the rest raw synthesis gas without water gas shiftConverging the synthesis gas to obtain a crude synthesis gas with a hydrogen-carbon ratio regulated and controlled; h in the crude synthesis gas after the hydrogen-carbon ratio is regulated and controlled2The molar ratio of the carbon dioxide to CO is 1.6-2.4;
s3: deacidifying and separating of crude synthesis gas
Purifying the crude synthesis gas treated in the step S2 by a low-temperature methanol washing process to remove acid gas in the synthesis gas and obtain purified synthesis gas;
separating the purified synthesis gas to obtain CO respectively2And with H2And syngas based on CO;
will be given H2The synthesis gas mainly containing CO is divided into a synthesis gas I and a synthesis gas II;
s4: methanol synthesis
Synthesis gas I was used for methanol synthesis (CO and H)2Reacting at high temperature to generate methanol);
s5: synthesis of dimethyl carbonate
CO separated in step S32Reacting with the methanol prepared in the step S4 to generate dimethyl carbonate and water, and then reacting the water with external ethylene oxide to generate ethylene glycol;
s6: ethylene glycol synthesis
Reacting the synthesis gas II separated in the step S3 with methyl nitrite to generate dimethyl oxalate and nitric oxide, and performing a side reaction to generate dimethyl carbonate and nitric oxide; dimethyl oxalate is first reacted with H2Reacting to produce methyl glycolate and methanol, and reacting methyl glycolate with H2The reaction generates glycol and methanol, and then part of the methanol reacts with nitric oxide and oxygen to generate methyl nitrite;
s7: refining of dimethyl carbonate
Rectifying and separating the mixed gas of the dimethyl carbonate and the ethylene glycol obtained in the step S5 to respectively obtain pure dimethyl carbonate and ethylene glycol;
s8: ethylene glycol purification
And (4) rectifying and separating the ethylene glycol, the methanol and the dimethyl carbonate obtained in the step (S6) to respectively obtain the ethylene glycol, the dimethyl carbonate and the methanol, and recycling the obtained methanol to the step (S6).
Preferably, in the consumption of the raw materials of the method, the ratio of the molar weight of the ethylene oxide to the mass of the raw material coal is 1-10 kmol/t.
Preferably, in step S2, the raw synthesis gas subjected to water gas shift accounts for 20 to 80 mol% of the total raw synthesis gas.
Preferably, in step S3, the molar ratio of the synthesis gas I to the synthesis gas II is 0.5-2: 1.
Preferably, in the method, the yield ratio of the ethylene glycol to the dimethyl carbonate is 0.7-1.5 t:1 t.
Compared with the prior art, the invention has the beneficial effects that:
1. coupling of CO according to the invention2The method for preparing dimethyl carbonate and co-producing ethylene glycol assists in the production of ethylene glycol from coal, recycles carbon dioxide in a system, greatly reduces carbon emission of the system, improves the utilization efficiency of carbon resources of the system, realizes high-efficiency utilization of resources, avoids environmental pollution caused by excessive emission, improves the technical and economic performance of the system, and is beneficial to improving resource allocation and consumption structures in China. The method of the invention also improves the productivity of the system and realizes the advantage complementation of the process performance.
2. The invention produces the methanol by adjusting the proper proportion of the synthesis gas, realizes the self-production and self-supply of the methanol, does not need external supply, avoids the fluctuation of the raw material cost caused by the influence of the outside on the methanol, improves the risk resistance and reduces the cost.
3. According to the invention, the ethylene glycol is prepared and the dimethyl carbonate is co-produced, so that the efficient utilization of carbon atoms of the system is realized, and the economic performance of the system is improved.
Drawings
FIG. 1 shows the coupling of CO according to the invention2The process scheme for synthesizing dimethyl carbonate and co-producing ethylene glycol is shown in the figure, wherein 1-17 are pipeline material flow numbers, 1 is ethylene oxide, 2 is raw material coal, 3 is crude synthesis gas, 4 is crude synthesis gas without water gas shift, 5 is crude synthesis gas after hydrogen-carbon ratio regulation and control, 6 is carbon dioxide, and 7 is H2CO-based synthesis gas, 8 is synthesis gas I, 9 is methanol, 10 is synthesis gas II, 11 is dimethyl carbonate and ethylene glycol, 12 is ethylene glycol, methanol and dimethyl carbonate, 13 is circulating methanol, 14 is dimethyl carbonate I, 15 is dimethyl carbonate II, 16 is ethylene glycol II, and 17 is ethylene glycol I.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. The following disclosure is merely exemplary and illustrative of the inventive concept, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Example 1
As shown in FIG. 1, the present embodiment couples CO2The method for synthesizing dimethyl carbonate and coproducing ethylene glycol comprises the following steps:
s1: raw material coal gasification for preparing crude synthesis gas
Crushing and screening the dried raw material coal, and then carrying out gasification reaction (at the high temperature of 1300-1500 ℃, the pressurization of 2.7-6.5 MPa and with oxygen as a gasification agent) to obtain the H2CO and CO2The raw synthesis gas (H in the raw synthesis gas) is mainly2The molar ratio of the carbon dioxide to CO is 0.3-0.8).
S2: raw syngas water gas shift
Subjecting a portion of the raw syngas produced in step S1 to water gas shift to convert CO and H2Reaction of O to H2And CO2(ii) a Merging the crude synthesis gas subjected to water gas shift with the rest crude synthesis gas which is not subjected to water gas shift to obtain crude synthesis gas with a hydrogen-carbon ratio regulated and controlled; h in the crude synthesis gas after the hydrogen-carbon ratio is regulated and controlled2The molar ratio of the carbon dioxide to CO is 1.6-2.4.
S3: deacidifying and separating of crude synthesis gas
Purifying the crude synthesis gas treated in the step S2 by a low-temperature methanol washing process to remove acid gas in the synthesis gas and obtain purified synthesis gas;
separating the purified synthesis gas to respectively obtain CO2And with H2And syngas based on CO;
will be given H2And the synthesis gas mainly containing CO is divided into a synthesis gas I and a synthesis gas II.
S4: methanol synthesis
Synthesis gas I was used for methanol synthesis (CO and H)2Reaction at high temperature to methanol).
S5: synthesis of dimethyl carbonate
CO separated in step S32Reacts with the methanol prepared in step S4 to produce dimethyl carbonate and water, and then the water reacts with the external ethylene oxide to produce ethylene glycol.
S6: ethylene glycol synthesis
Reacting the synthesis gas II separated in the step S3 with methyl nitrite to generate dimethyl oxalate and nitric oxide, and performing a side reaction to generate dimethyl carbonate and nitric oxide; dimethyl oxalate is first reacted with H2Reacting to produce methyl glycolate and methanol, and reacting methyl glycolate with H2The reaction produces ethylene glycol and methanol, and then part of the methanol reacts with nitric oxide and oxygen to produce methyl nitrite.
S7: refining of dimethyl carbonate
And (4) rectifying and separating the mixed gas of the dimethyl carbonate and the ethylene glycol obtained in the step (S5) to respectively obtain pure dimethyl carbonate and ethylene glycol.
S8: ethylene glycol purification
And (4) rectifying and separating the ethylene glycol, the methanol and the dimethyl carbonate obtained in the step (S6) to respectively obtain the ethylene glycol, the dimethyl carbonate and the methanol, and recycling the obtained methanol to the step (S6).
In this embodiment, specifically, the following are set: the ratio of the molar weight of ethylene oxide in the raw material consumption to the mass of the raw material coal is 3.23 kmol/t; in step S2, the raw synthesis gas subjected to water gas shift accounts for 49% by mole of the whole raw synthesis gas; in step S3, the molar ratio of the synthesis gas I to the synthesis gas II is 1.85: 1; the yield ratio of the ethylene glycol and the dimethyl carbonate co-produced by the process system is 1:1 t/t.
The ethylene glycol production is carried out according to the optimal process system and the operation conditions, and the specific process parameters are as follows:
the mass flow of the consumed raw material coal is 340t/h, and the molar flow of the ethylene oxide is 1100 kmol/h; the mass flow rate of the dimethyl carbonate product is 92t/h, and the mass flow rate of the ethylene glycol product is 93 t/h. The total process flow generates synthesis gas with mass flow of 416t/h, wherein 270t/h (65%) of the synthesis gas is used for synthesizing methanol and 146t/h (35%) of the synthesis gas is used for synthesizing glycol.
The present invention is not limited to the above exemplary embodiments, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. Coupling CO2The method for synthesizing dimethyl carbonate and coproducing ethylene glycol is characterized by comprising the following steps:
s1: raw material coal gasification for preparing crude synthesis gas
Crushing and screening the dried raw material coal, and then carrying out gasification reaction to obtain H2CO and CO2A primarily crude synthesis gas;
s2: raw syngas water gas shift
Subjecting a portion of the raw syngas produced in step S1 to water gas shift to convert CO and H2Reaction of O to H2And CO2(ii) a Merging the crude synthesis gas subjected to water gas shift with the rest crude synthesis gas which is not subjected to water gas shift to obtain crude synthesis gas with a hydrogen-carbon ratio regulated and controlled; h in the crude synthesis gas after the hydrogen-carbon ratio is regulated and controlled2The molar ratio of the carbon dioxide to CO is 1.6-2.4;
s3: deacidifying and separating of crude synthesis gas
Purifying the crude synthesis gas treated in the step S2 by a low-temperature methanol washing process to remove acid gas in the synthesis gas and obtain purified synthesis gas;
separating the purified synthesis gas to obtain CO respectively2And with H2And syngas based on CO;
will be given H2The synthesis gas mainly containing CO is divided into a synthesis gas I and a synthesis gas II;
s4: methanol synthesis
The synthesis gas I is used for methanol synthesis;
s5: synthesis of dimethyl carbonate
CO separated in step S32Reacting with the methanol prepared in the step S4 to generate dimethyl carbonate and water, and then reacting the water with external ethylene oxide to generate ethylene glycol;
s6: ethylene glycol synthesis
Reacting the synthesis gas II separated in the step S3 with methyl nitrite to generate dimethyl oxalate and nitric oxide, and performing a side reaction to generate dimethyl carbonate and nitric oxide; dimethyl oxalate is first reacted with H2Reacting to produce methyl glycolate and methanol, and reacting methyl glycolate with H2The reaction generates glycol and methanol, and then part of the methanol reacts with nitric oxide and oxygen to generate methyl nitrite;
s7: refining of dimethyl carbonate
Rectifying and separating the mixed gas of the dimethyl carbonate and the ethylene glycol obtained in the step S5 to respectively obtain pure dimethyl carbonate and ethylene glycol;
s8: ethylene glycol purification
And (4) rectifying and separating the ethylene glycol, the methanol and the dimethyl carbonate obtained in the step (S6) to respectively obtain the ethylene glycol, the dimethyl carbonate and the methanol, and recycling the obtained methanol to the step (S6).
2. The method of claim 1, wherein: in the raw material consumption of the method, the ratio of the molar weight of the ethylene oxide to the mass of the raw material coal is 1-10 kmol/t.
3. The method of claim 1, wherein: in step S2, the raw synthesis gas subjected to water gas shift accounts for 20 to 80 mol% of the total raw synthesis gas.
4. The method of claim 1, wherein: in step S3, the molar ratio of the synthesis gas I to the synthesis gas II is 0.5-2: 1.
5. The method of claim 1, wherein: in the method, the yield ratio of the ethylene glycol to the dimethyl carbonate is 0.7-1.5 t:1 t.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477087A (en) * | 2022-02-24 | 2022-05-13 | 安徽昊源化工集团有限公司 | System and method for preparing ethylene glycol from coal by integrating chemical-looping air separation and chemical-looping hydrogen production technologies |
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| CN101462961A (en) * | 2008-01-28 | 2009-06-24 | 上海戊正工程技术有限公司 | Process flow for producing ethylene glycol with coproduction product dimethyl carbonate |
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| US20180258019A1 (en) * | 2017-03-13 | 2018-09-13 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Method and apparatus for improving the efficiency of reforming process for producing syngas and methanol while reducing the co2 in a gaseous stream |
| CN110590501A (en) * | 2019-08-07 | 2019-12-20 | 内蒙古大唐国际克什克腾煤制天然气有限责任公司 | Processing technology for co-production of methanol and ethylene glycol from coal-based natural gas |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101462961A (en) * | 2008-01-28 | 2009-06-24 | 上海戊正工程技术有限公司 | Process flow for producing ethylene glycol with coproduction product dimethyl carbonate |
| CN101844986A (en) * | 2010-05-27 | 2010-09-29 | 浙江师范大学 | Method for preparing dimethyl carbonate by using carbon dioxide (CO2) |
| US20180258019A1 (en) * | 2017-03-13 | 2018-09-13 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Method and apparatus for improving the efficiency of reforming process for producing syngas and methanol while reducing the co2 in a gaseous stream |
| CN110590501A (en) * | 2019-08-07 | 2019-12-20 | 内蒙古大唐国际克什克腾煤制天然气有限责任公司 | Processing technology for co-production of methanol and ethylene glycol from coal-based natural gas |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114477087A (en) * | 2022-02-24 | 2022-05-13 | 安徽昊源化工集团有限公司 | System and method for preparing ethylene glycol from coal by integrating chemical-looping air separation and chemical-looping hydrogen production technologies |
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