CN103601616B - Alcohol-water separation recycling method of Fischer-Tropsch synthesis reaction water - Google Patents
Alcohol-water separation recycling method of Fischer-Tropsch synthesis reaction water Download PDFInfo
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- CN103601616B CN103601616B CN201310581978.7A CN201310581978A CN103601616B CN 103601616 B CN103601616 B CN 103601616B CN 201310581978 A CN201310581978 A CN 201310581978A CN 103601616 B CN103601616 B CN 103601616B
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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
- C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
- C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/448—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by pervaporation
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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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
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- 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
Abstract
The invention discloses an alcohol-water separation recycling method of fischer-tropsch synthesis reaction water, belongs to the technical fields of environmental protection and recycling, and solves the technical problems that the energy consumption is high in treatment of the reaction water, and an organic raw material in the reaction water cannot be fully utilized in the prior art. The alcohol-water separation recycling method comprises the following steps: (1) pretreatment, namely adjusting the pH value of the reaction water, suspended solids and oil content after carrying out alkaline neutralization, coagulation air floatation and multi-stage filtering on the fischer-tropsch synthesis reaction water; (2) alcohol-water separation, namely carrying out pervaporation treatment on the pretreated raw material water by adopting a membrane process; (3) alcohol liquid concentration, namely distilling a low-carbon alcohol liquid to obtain the low-carbon alcohol liquid of which the concentration is greater than 70% (wt) by using a distillation tower; and (4) alcohol liquid dehydration, namely carrying out vapor permeation dehydration on a high-concentration mixed alcohol solution by using the membrane process. By adopting the alcohol-water separation recycling method, available resources which are discharged as wastewater in the past are effectively recovered by using low energy consumption; a disadvantage is converted into an advantage; resources and energy sources are saved; and the target of recycling to create profit is also achieved.
Description
Technical field
The present invention relates to a kind of alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water, belong to environmental protection and resource technology field.
Background technology
Along with the fast development of economy, more and more higher to the requirement of environment protection, available resources are fewer and feweri.In Industrial processes, especially in the industry such as petrochemical complex, fine chemistry industry, produce a large amount of industrial by-products, part by product has very large recycling and is worth.Deal carefully with direct discharge as these waste water and waste liquid do not add, ill effect will be produced to surrounding environment, and affect HUMAN HEALTH.Meanwhile, such has the discarded of the organic solvent of utility value or discharge, also result in the serious waste of resource.
By the important development direction that cyclostrophic liquid (GTL) technology of Sweet natural gas preparing liquid fuel is current chemical industry.Synthetic oil as one of three kinds of fuel (synthetic oil, dme, methyl alcohol) of 21 century GTL, then becomes Hot spots for development.Wherein F-T synthesis technology is the key of GTL technology.F-T synthesis is using the synthetic gas of carbon monoxide and hydrogen as raw material, and under certain temperature and pressure condition, with cobalt-based or iron-based for catalyzer, hydrocarbons is produced in reaction, produces the process of water and other oxygen-containing hydrocarbon class materials simultaneously.
Synthesis reaction water is one of primary product of Fischer-Tropsch synthesis process, containing materials such as alcohol, hydrocarbon, acid in it, have the advantages that the water yield is large, temperature is high, COD content is high, saltiness is low, direct discharge will produce high risks to environment, as directly processed rear reuse, in water, alcoholic product cannot reclaim, and brings the significant wastage of resource.
In view of the development of GTL technology, both at home and abroad the applied research of synthesis water technology is also progressively paid attention to, also can consult out relevant patented technology.Such as: patent CN1696082A, propose a kind of rectifying tower that adopts and F-T synthesis reaction water is carried out the method for separating treatment.F-T synthesis reaction water adds from the upper feed inlet of rectifying tower, rectifying is carried out under the condition of proper temperature, pressure and reflux ratio, tower top can obtain the mixture containing lower boiling organic oxygen-containing compounds such as alcohol containing a small amount of water, obtains the reaction water containing the higher organism oxygenatedchemicals of a small amount of boiling point at the bottom of tower.Tower top part can be used as fuel or further Separation and Recovery each component, and tower bottom divides can be back to the synthetic gas production technique that solid combustible burning organic-fuel is raw material.Rectifier unit in the method has higher energy consumption.But such scheme just processes aqueous phase by-product, do not make full use of each basic organic in aqueous phase by-product, and the whole separation process of aqueous phase by-product is described.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water, solve prior art energy consumption when processing reaction water high and the technical problem of the organic raw material in reaction water can not be made full use of.
For achieving the above object, the invention provides a kind of alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water, comprising the following steps:
(1) pre-treatment: by Fischer-Tropsch synthesis reaction water by regulating the pH value of reaction water, suspended solid and oil-contg after adding alkali neutralization, coagulation air-float and cascade filtration, obtain the raw water containing alcohol mixture;
(2) alcohol-water separation: adopt embrane method to carry out infiltration evaporation process pretreated raw water, obtain Separation of Water and lower concentration alcohol mixture liquid, lower concentration alcohol mixture liquid concentration is greater than 15%(wt); Isolated lower concentration alcohol mixture liquid is separated by recycling Liquid liquid Separation device again, obtains the higher alcohols liquid of more than C4 and the low-carbon alcohol liquid of C1-C3;
(3) alcohol liquid concentrate: low-carbon alcohol liquid carried out distillation with distillation tower and obtain concentration and be greater than 70%(wt) low-carbon alcohol liquid, still liquid at the bottom of tower is back in step (2) and again processes;
(4) alcohol fluid dewatering: the concentration obtained in the higher alcohols liquid obtained in step (2) and step (3) is greater than 70%(wt) low-carbon alcohol liquid be mixed to get high density alcohol mixture solution, by embrane method, water vapour penetration dehydration is carried out to high density alcohol mixture solution, obtains 99.5%(wt) high density alcohol mixture liquid and Separation of Water.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, also comprise step (5), reuse water process: collected by the Separation of Water of discharging in step (2) and step (4), by biological process and embrane method to Separation of Water process, obtaining can the middle water of reuse.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, in step (1), cascade filtration adopts any one or multiple combination of sand filtration, secondary filter, membrane filtration, and make the raw water suspended solid containing alcohol mixture be less than 5mg/L, oil-contg is less than 5mg/L.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, in step (1), by adding alkali neutralization, regulate the pH of reaction water between 6-9.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, in step (2), the film carrying out infiltration evaporation is organic hybrid films.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, in step (2), the film carrying out water vapour penetration is organic zeolite membrane.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, described organic zeolite membrane is NaA type and or NaY type ..
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, described biological process is anaerobism, hold concurrently oxygen and/or aerobic treatment method.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, described embrane method is tubular ultra-filtration membrane facture.
In the alcohol-water separation recovery method of above-mentioned Fischer-Tropsch synthesis reaction water, described middle water COD≤30mg/L, SS≤10mg/L.
The invention has the beneficial effects as follows:
1, for have in Fischer-Tropsch synthesis reaction water polycomponent, mass concentration less than 10% alcohol type organic, present method is adopted to carry out effective alcohol-water separation, the alcohol mixture product that output purity is greater than 99.5% reclaims, effective reduction operation energy consumption, produce considerable economic benefit, greatly improve the economy of Fischer-tropsch process;
2, the quality of reused water index after being separated is better than circulating cooling water quality index, can meet the requirement of production reuse, not only solves the pollution problem of synthetic water discharge, more solves the problem of water consumption in shortage of water area, has the good feature of environmental protection and economy.
The alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water provided by the invention has effectively reclaimed the original available stock as discharge of wastewater by lower energy consumption, turn harm into good, both resource and the energy had been saved, reach again the object reclaiming and make profits, have significant environmental benefit and economic benefit, the resource utilization for Fischer-tropsch process synthetic water is recycled and is provided complete technological line and feasible practical experience.
Accompanying drawing explanation
Fig. 1 is process flow sheet provided by the invention.
Embodiment
Embodiment one
Synthetic water is originated: the F-T synthesis reaction water using cobalt-base catalyst.PH value 3, wherein containing C1-C8 alcohol, alcohol total mass content is 5.5%, micro-alkane and olefines, and all the other are water, oleaginousness 350mg/L.
(1) pre-treatment: to be neutralized to pH value be 9 by adding alkali by Fischer-Tropsch synthesis reaction water, enters air-flotation system oil removing removal of impurities, then process further through sand filtration, accurate filter after coagulating, obtains the raw water containing alcohol mixture of oleaginousness 4mg/L;
(2) alcohol-water separation: the alcohol permselective membrane device pretreated raw water being entered organic hybrid films carries out infiltration evaporation process, by alcohol-water separation, obtains Separation of Water and 33%(wt) lower concentration alcohol mixture liquid; Isolated lower concentration alcohol mixture liquid is separated by recycling Liquid liquid Separation device again, and after being obviously divided into, obtaining upper strata is 85%(wt) the higher alcohols liquid of more than C4 and lower floor 31%(wt) the low-carbon alcohol liquid of C1-C3;
(3) alcohol liquid concentrate: lower floor's low-carbon alcohol liquid distillation tower carries out distilling rear condensation, and to reclaim mass concentration be 88%(wt) low-carbon alcohol liquid, still liquid at the bottom of distillation tower tower is back in step (2) and again processes;
(4) alcohol fluid dewatering: the 85%(wt by obtaining in step (2)) to obtain mass concentration in the higher alcohols liquid of more than C4 and step (3) be 88%(wt) low-carbon alcohol liquid be mixed to get high density alcohol mixture solution, by embrane method, water vapour penetration dehydration is carried out to high density alcohol mixture solution, the film carrying out water vapour penetration is NaA type organic zeolite membrane, obtains 99.6%(wt) high density alcohol mixture liquid and Separation of Water.
(5), reuse water process: collected by the Separation of Water of discharging in step (2) and step (4), processes Separation of Water by the method facture that anaerobic process and tubular ultra-filtration membrane combine, obtains pH value 9, CODcr25mg/L, SS 5mg/L's can the middle water of reuse.
Embodiment two
Synthetic water is originated: the F-T synthesis reaction water using cobalt-base catalyst.PH value 4, wherein containing C1-C8 alcohol, alcohol total mass content is 4.2%, micro-alkane and olefines, and all the other are water, oleaginousness 300mg/L.
(1) pre-treatment: to be neutralized to pH value be 6 by adding alkali by Fischer-Tropsch synthesis reaction water, enters air-flotation system oil removing removal of impurities, then process further through sand filtration, accurate filter after coagulating, obtains the raw water containing alcohol mixture that oleaginousness is 4.5mg/L;
(2) alcohol-water separation: the alcohol permselective membrane device pretreated raw water being entered organic hybrid films carries out infiltration evaporation process, by alcohol-water separation, obtains Separation of Water and 28%(wt) lower concentration alcohol mixture liquid; Isolated lower concentration alcohol mixture liquid is separated by recycling Liquid liquid Separation device again, and after being obviously divided into, obtaining upper strata is 82%(wt) the higher alcohols liquid of more than C4 and lower floor 31%(wt) the low-carbon alcohol liquid of C1-C3;
(3) alcohol liquid concentrate: lower floor's low-carbon alcohol liquid distillation tower carries out distilling rear condensation, and to reclaim mass concentration be 85%(wt) low-carbon alcohol liquid, still liquid at the bottom of distillation tower tower is back in step (2) and again processes;
(4) alcohol fluid dewatering: the 85%(wt by obtaining in step (2)) to obtain mass concentration in the higher alcohols liquid of more than C4 and step (3) be 88%(wt) low-carbon alcohol liquid be mixed to get high density alcohol mixture solution, by embrane method, water vapour penetration dehydration is carried out to high density alcohol mixture solution, the film carrying out water vapour penetration is NaY type organic zeolite membrane, obtains 99.7%(wt) high density alcohol mixture liquid and Separation of Water.
(5) reuse water process: collected by the Separation of Water of discharging in step (2) and step (4), processes Separation of Water by the method facture that aerobic method and double oxygen method combine, and what obtain pH value 6.6, CODcr22mg/L, SS 5mg/L can the middle water of reuse.
Embodiment three
The algorithm of the present embodiment is substantially identical with embodiment two, and difference is, in (1) pre-treatment, by Fischer-Tropsch synthesis reaction water, by adding alkali, to be neutralized to pH value be 7.5, and in step (5), in reuse water process, what obtain pH value 7.3 can the middle water of reuse.
Claims (10)
1. an alcohol-water separation recovery method for Fischer-Tropsch synthesis reaction water, is characterized in that, comprise the following steps:
(1) pre-treatment: by Fischer-Tropsch synthesis reaction water by regulating the pH value of reaction water, suspended solid and oil-contg after adding alkali neutralization, coagulation air-float and cascade filtration, obtain the raw water containing alcohol mixture;
(2) alcohol-water separation: adopt embrane method to carry out infiltration evaporation process pretreated raw water, obtain Separation of Water and lower concentration alcohol mixture liquid, lower concentration alcohol mixture liquid concentration is greater than 15%(wt); Isolated lower concentration alcohol mixture liquid is separated by recycling Liquid liquid Separation device again, obtains the higher alcohols liquid of more than C4 and the low-carbon alcohol liquid of C1-C3;
(3) alcohol liquid concentrate: low-carbon alcohol liquid carried out distillation with distillation tower and obtain concentration and be greater than 70%(wt) low-carbon alcohol liquid, still liquid at the bottom of tower is back in step (2) and again processes;
(4) alcohol fluid dewatering: the concentration obtained in the higher alcohols liquid obtained in step (2) and step (3) is greater than 70%(wt) low-carbon alcohol liquid be mixed to get high density alcohol mixture solution, by embrane method, water vapour penetration dehydration is carried out to high density alcohol mixture solution, obtains 99.5%(wt) high density alcohol mixture liquid and Separation of Water.
2. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 1, it is characterized in that, also comprise step (5), reuse water process: the Separation of Water of discharging in step (2) and step (4) is collected, by biological process and embrane method to Separation of Water process, obtaining can the middle water of reuse.
3. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 1 and 2, it is characterized in that, in step (1), cascade filtration adopts any one or multiple combination of sand filtration, secondary filter, membrane filtration, make the raw water suspended solid containing alcohol mixture be less than 5mg/L, oil-contg is less than 5mg/L.
4. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 1 and 2, is characterized in that, in step (1), by adding alkali neutralization, regulates the pH of reaction water between 6-9.
5. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 1 and 2, is characterized in that, in step (2), the film carrying out infiltration evaporation is organic hybrid films.
6. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 1 and 2, is characterized in that, in step (4), the film carrying out water vapour penetration is organic zeolite membrane.
7. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 6, is characterized in that, described organic zeolite membrane is NaA type and/or NaY type.
8. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 2, is characterized in that, described biological process is anaerobism, hold concurrently oxygen and/or aerobic treatment method.
9. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 2, is characterized in that, described embrane method is tubular ultra-filtration membrane facture.
10. the alcohol-water separation recovery method of Fischer-Tropsch synthesis reaction water according to claim 2, is characterized in that, described middle water COD≤30mg/L, SS≤10mg/L.
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| CN105152860B (en) * | 2015-09-07 | 2017-07-04 | 福州大学 | A kind of method of the refined mixed alcohol of rectifying pervaporation coupling technique |
| CN107226579A (en) * | 2016-03-24 | 2017-10-03 | 福建省三净环保科技有限公司 | A kind of sewage disposal device |
| CN105819604B (en) * | 2016-04-14 | 2019-06-07 | 神华集团有限责任公司 | The water treatment system and method for organic acid are separated from F- T synthesis waste water |
| CN105819603B (en) * | 2016-04-14 | 2019-08-27 | 神华集团有限责任公司 | The separation method of oxygen-bearing organic matter in F- T synthesis waste water |
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| CN1662455A (en) * | 2002-06-18 | 2005-08-31 | 萨索尔技术(控股)有限公司 | Method of purifying Fischer-Tropsch derived water |
| CN102458620A (en) * | 2009-05-06 | 2012-05-16 | 艾尼股份公司 | Process for the purification of an aqueous stream coming from the fischer-tropsch reaction |
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| US5230801A (en) * | 1992-11-02 | 1993-07-27 | Exxon Research And Engineering Company | Recovery of alcohols from n-paraffins by pervaporation |
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| CN1662455A (en) * | 2002-06-18 | 2005-08-31 | 萨索尔技术(控股)有限公司 | Method of purifying Fischer-Tropsch derived water |
| CN102458620A (en) * | 2009-05-06 | 2012-05-16 | 艾尼股份公司 | Process for the purification of an aqueous stream coming from the fischer-tropsch reaction |
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