CN111662757A - Method for synthesizing methanol by low-carbon technology - Google Patents
Method for synthesizing methanol by low-carbon technology Download PDFInfo
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- CN111662757A CN111662757A CN202010532280.6A CN202010532280A CN111662757A CN 111662757 A CN111662757 A CN 111662757A CN 202010532280 A CN202010532280 A CN 202010532280A CN 111662757 A CN111662757 A CN 111662757A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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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
- C07C29/15—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
- C07C29/1518—Multisteps one step being the formation of initial mixture of carbon oxides and hydrogen for synthesis
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
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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
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/40—Ethylene production
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- Combustion & Propulsion (AREA)
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- Environmental & Geological Engineering (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a method for synthesizing methanol by a low-carbon technology, which comprises the following steps: the method comprises the following steps: preparing coal water slurry; step two: coal gasification; step three: CO conversion and low-temperature methanol washing; step four: carrying out methane steam conversion; step five: synthesizing a compressor; step six: methanol synthesis and MTO methanol preparation; step seven: treating grey water; step eight: heavy metal treatment, wherein heavy metal nickel exists in sewage in the grey water treatment, sulfide added in the heavy metal treatment reacts with the heavy metal nickel, precipitate and mixed water are generated after the heavy metal treatment reaction, the mixed water is mixed with water for preparing coal water slurry, and the mixed water for preparing the coal water slurry is mixed with coal. The invention has the beneficial effects that: and (2) carrying out sewage treatment by utilizing heavy metal treatment, adding sulfide in the heavy metal treatment process, precipitating heavy metal nickel by adopting a sulfide precipitation method, mixing excessive sulfide mixed water with the coal water slurry, and reacting with heavy metal in the raw material coal to reduce the content of heavy metal in the coal water slurry.
Description
Technical Field
The invention relates to the field of methanol synthesis methods, in particular to a method for synthesizing methanol by a low-carbon technology.
Background
Methanol is a saturated monohydric alcohol with the simplest structure, CAS number 67-56-1 or 170082-17-4, molecular weight 32.04, boiling point 64.7 ℃. It is also called "xylitol" or "wood essence" because it is found in dry-distilled wood for the first time. The lowest dose of poisoning in oral administration of people is about 100mg/kg of body weight, and 0.3-1 g/kg of poisoning in oral administration can kill the human body. Used for producing formaldehyde, agricultural chemicals, etc., and used as an extractant for organic substances and a denaturant for alcohol, etc. The finished product is usually prepared by the reaction of carbon monoxide and hydrogen, the methanol is prepared by adopting natural gas or petroleum gas, a mature process is provided, because the methanol prepared by the natural gas or petroleum gas can generate a large amount of excessive hydrogen, the conversion efficiency can be influenced on one hand, and on the other hand, the methanol prepared by taking the natural gas or petroleum gas as the raw material is difficult to control the cost because of the influence of the international price of the natural gas or petroleum; in the process of synthesizing methanol by adopting a low-carbon technology, heavy metal substances are contained in grey water treatment, so that the direct discharge of sewage is not beneficial to environmental protection, and when the sewage is adopted for preparing the coal water slurry, the heavy metal content in the coal water slurry is too high, so that the subsequent reaction is not beneficial.
Disclosure of Invention
The invention mainly aims to provide a method for synthesizing methanol by a low-carbon technology, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for synthesizing methanol by a low-carbon technology comprises the following steps:
the method comprises the following steps: preparing coal water slurry, mixing raw material coal and water, continuously stirring and mixing to prepare the coal water slurry, mixing and precipitating the water and the raw material coal to generate coarse slag in the mixing process of the coal water slurry, separating the coarse slag from the coal water slurry, and discharging the coal water slurry to enter coal gasification equipment;
step two: coal gasification, namely introducing oxygen into the coal water slurry and the air separation device to perform coal gasification reaction to generate raw coal gas;
step three: CO transformation and low-temperature methanol washing, wherein the crude gas is subjected to CO transformation, and the low-temperature methanol washing is used for desulfurizing and decarbonizing the changed gas;
step four: performing methane steam conversion, namely performing methane steam conversion on raw natural gas and combustion natural gas to generate synthesis gas;
step five: a synthesis compressor, wherein the synthesis gas obtained by converting the coal synthesis gas and the methane steam enters the synthesis compressor, and the compressed gas enters the methanol synthesis equipment;
step six: methanol synthesis and MTO methanol preparation, wherein the compressed gas is used for preparing and synthesizing MTO methanol through methanol synthesis equipment and MTO methanol;
step seven: treating the grey water to generate fine slag and sewage, and introducing the sewage into heavy metal treatment equipment;
step eight: and (3) heavy metal treatment, namely adding sulfide into heavy metal treatment equipment, reacting the sulfide with sewage in the heavy metal treatment equipment, reacting the heavy metal with the sulfide to generate precipitate, and mixing the upper-layer sewage with water and coal to prepare the coal water slurry.
Preferably, the heavy metal nickel is present in the grey water treatment effluent.
Preferably, the sulfide added in the heavy metal treatment reacts with heavy metal nickel, precipitate and mixed water are generated after the heavy metal treatment reaction, and the mixed water is mixed with the water for preparing the coal water slurry.
Preferably, the mixed water for preparing the coal water slurry is mixed with coal, the mixed water for preparing the coal water slurry contains sulfides, the sulfides react with the raw coal in the coal water slurry, and coarse slag generated in the preparation process of the coal water slurry contains heavy metal nickel.
Compared with the prior art, the invention has the following beneficial effects: and (2) carrying out sewage treatment by utilizing heavy metal treatment, adding sulfide in the heavy metal treatment process, precipitating heavy metal nickel by adopting a sulfide precipitation method, mixing excessive sulfide mixed water with the coal water slurry, and reacting with heavy metal in the raw material coal to reduce the content of heavy metal in the coal water slurry.
Drawings
FIG. 1 is a schematic diagram of a method for synthesizing methanol by a low-carbon technology of the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
Example 1
The method for synthesizing methanol by using the low-carbon technology shown in figure 1 comprises the following steps:
the method comprises the following steps: preparing coal water slurry, mixing raw material coal and water, continuously stirring and mixing to prepare the coal water slurry, mixing and precipitating the water and the raw material coal to generate coarse slag in the mixing process of the coal water slurry, separating the coarse slag from the coal water slurry, and discharging the coal water slurry to enter coal gasification equipment;
step two: coal gasification, namely introducing oxygen into the coal water slurry and the air separation device to perform coal gasification reaction to generate raw coal gas;
step three: CO transformation and low-temperature methanol washing, wherein the crude gas is subjected to CO transformation, and the low-temperature methanol washing is used for desulfurizing and decarbonizing the changed gas;
step four: performing methane steam conversion, namely performing methane steam conversion on raw natural gas and combustion natural gas to generate synthesis gas;
step five: a synthesis compressor, wherein the synthesis gas obtained by converting the coal synthesis gas and the methane steam enters the synthesis compressor, and the compressed gas enters the methanol synthesis equipment;
step six: methanol synthesis and MTO methanol preparation, wherein the compressed gas is used for preparing and synthesizing MTO methanol through methanol synthesis equipment and MTO methanol;
step seven: treating the grey water to generate fine slag and sewage, and introducing the sewage into heavy metal treatment equipment;
step eight: and (3) heavy metal treatment, namely adding sulfide into heavy metal treatment equipment, reacting the sulfide with sewage in the heavy metal treatment equipment, reacting the heavy metal with the sulfide to generate precipitate, and mixing the upper-layer sewage with water and coal to prepare the coal water slurry.
Wherein heavy metal nickel exists in sewage in grey water treatment; reacting the sulfide added in the heavy metal treatment with heavy metal nickel, generating precipitate and mixed water after the heavy metal treatment reaction, and mixing the mixed water with the water for preparing the coal water slurry; the mixed water for preparing the coal water slurry is mixed with coal, the mixed water for preparing the coal water slurry contains sulfides, the sulfides react with the raw coal in the coal water slurry, and coarse slag generated in the preparation process of the coal water slurry contains heavy metal nickel; and (2) carrying out sewage treatment by utilizing heavy metal treatment, adding sulfide in the heavy metal treatment process, precipitating heavy metal nickel by adopting a sulfide precipitation method, mixing excessive sulfide mixed water with the coal water slurry, and reacting with heavy metal in the raw material coal to reduce the content of heavy metal in the coal water slurry.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (4)
1. A method for synthesizing methanol by a low-carbon technology is characterized by comprising the following steps:
the method comprises the following steps: preparing coal water slurry, mixing raw material coal and water, continuously stirring and mixing to prepare the coal water slurry, mixing and precipitating the water and the raw material coal to generate coarse slag in the mixing process of the coal water slurry, separating the coarse slag from the coal water slurry, and discharging the coal water slurry to enter coal gasification equipment;
step two: coal gasification, namely introducing oxygen into the coal water slurry and the air separation device to perform coal gasification reaction to generate raw coal gas;
step three: CO transformation and low-temperature methanol washing, wherein the crude gas is subjected to CO transformation, and the low-temperature methanol washing is used for desulfurizing and decarbonizing the changed gas;
step four: performing methane steam conversion, namely performing methane steam conversion on raw natural gas and combustion natural gas to generate synthesis gas;
step five: a synthesis compressor, wherein the synthesis gas obtained by converting the coal synthesis gas and the methane steam enters the synthesis compressor, and the compressed gas enters the methanol synthesis equipment;
step six: methanol synthesis and MTO methanol preparation, wherein the compressed gas is used for preparing and synthesizing MTO methanol through methanol synthesis equipment and MTO methanol;
step seven: treating the grey water to generate fine slag and sewage, and introducing the sewage into heavy metal treatment equipment;
step eight: and (3) heavy metal treatment, namely adding sulfide into heavy metal treatment equipment, reacting the sulfide with sewage in the heavy metal treatment equipment, reacting the heavy metal with the sulfide to generate precipitate, and mixing the upper-layer sewage with water and coal to prepare the coal water slurry.
2. The method for synthesizing methanol by using a low-carbon technology as claimed in claim 1, wherein heavy metal nickel exists in the sewage in the grey water treatment.
3. The method for synthesizing methanol by using a low carbon technology as claimed in claim 2, wherein the sulfide added in the heavy metal treatment reacts with heavy metal nickel, the heavy metal treatment reaction produces precipitate and mixed water, and the mixed water is mixed with the water prepared from the coal water slurry.
4. The method for synthesizing methanol by using a low carbon technology as claimed in claim 3, wherein the mixed water prepared from the coal water slurry is mixed with coal, the mixed water prepared from the coal water slurry contains sulfides, the sulfides react with the raw coal in the coal water slurry, and the coarse slag generated in the preparation process of the coal water slurry contains heavy metal nickel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010532280.6A CN111662757A (en) | 2020-06-12 | 2020-06-12 | Method for synthesizing methanol by low-carbon technology |
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| CN202010532280.6A CN111662757A (en) | 2020-06-12 | 2020-06-12 | Method for synthesizing methanol by low-carbon technology |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201722311U (en) * | 2010-04-20 | 2011-01-26 | 陕西延长石油（集团）有限责任公司 | Device for synthesizing methanol by low-carbon technology |
| US20110186489A1 (en) * | 2010-02-02 | 2011-08-04 | General Electric Company | Gasification grey water treatment systems |
| CN109536225A (en) * | 2019-01-16 | 2019-03-29 | 西安科技大学 | A kind of gasification system and method applied near coal-mine natural gas from coal |
-
2020
- 2020-06-12 CN CN202010532280.6A patent/CN111662757A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110186489A1 (en) * | 2010-02-02 | 2011-08-04 | General Electric Company | Gasification grey water treatment systems |
| CN102811956A (en) * | 2010-02-02 | 2012-12-05 | 通用电气公司 | Gasification grey water treatment systems |
| CN201722311U (en) * | 2010-04-20 | 2011-01-26 | 陕西延长石油（集团）有限责任公司 | Device for synthesizing methanol by low-carbon technology |
| CN109536225A (en) * | 2019-01-16 | 2019-03-29 | 西安科技大学 | A kind of gasification system and method applied near coal-mine natural gas from coal |
Non-Patent Citations (1)
| Title |
|---|
| 熊道陵等: "《电镀污泥中有价金属提取技术》", 31 October 2013, 冶金工业出版社 * |
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Application publication date: 20200915 |