CN113600010B - Purification and regeneration method for Fischer-Tropsch synthesis tail gas hot potash solution, device and application thereof - Google Patents
Purification and regeneration method for Fischer-Tropsch synthesis tail gas hot potash solution, device and application thereof Download PDFInfo
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Abstract
The invention relates to the technical field of Fischer-Tropsch synthesis, and provides a purification and regeneration method of a Fischer-Tropsch synthesis tail gas hot potash solution and a device and application thereof.
Description
Technical Field
The invention relates to the technical field of Fischer-Tropsch synthesis, in particular to a purification and regeneration method of a hot potash solution of Fischer-Tropsch synthesis tail gas, a device and application thereof, and more particularly relates to a purification and regeneration method of a hot potash solution after decarbonization of Fischer-Tropsch synthesis tail gas, a device and application thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The Fischer-Tropsch synthesis process is to indirectly synthesize liquid fuel by using coal or natural gas as raw material, and H is reacted in Fischer-Tropsch reaction 2 And CO on the reduced catalyst to produce hydrocarbon product and water in the reaction process, and the water and CO produce water gas shift reaction to produce great amount of CO 2 . Therefore, after separation of the products from the gases exiting the synthesis reactor, the remaining tail gases must be freed of CO before recycling 2 。
The hot potash solution decarbonization process is widely applied to Fischer-Tropsch synthesis tail gas decarbonization industrial production due to the lowest hydrocarbon loss.
However, the inventor finds that in the actual operation process, organic matters such as alcohol, aldehyde, acid, ketone, ester and the like are in the circulating gas due to Fischer-Tropsch synthesis, and after the circulating gas is washed by a circulating gas water washing tower, part of residual organic matters such as aldehyde acid and the like enter a hot potash solution system along with tail gas to generate acid-base neutralization reaction with potassium carbonate, and the generated organic acid potassium is blocked in a pipeline and equipment filler, so that the whole system resistance is increased, accidents such as flooding and the like are easy to occur, the concentration of the potassium carbonate is reduced, and the decarburization effect is poor. And the content of potassium carbonate is reduced, the solution absorption capacity is reduced (for example, the concentration of the potassium carbonate solution is 320g/L, the potassium carbonate is fed into the solution in a month to reach 30 tons in the actual production process, and only the concentration of the solution can be maintained to be about 150 g/L), and as organic matters such as alcohol, aldehyde, acid, ketone and ester are continuously accumulated in the hot potash solution, the solution cleanliness is poor, the absorption capacity is reduced, the operation of maintaining the potassium carbonate at the index concentration can not be effectively realized by feeding the potassium carbonate, the hot potash solution needs to be replaced periodically, the consumption of the hot potash solution is high, the cost is high, and a normal treatment channel is avoided.
In addition, the inventor considers that the utilization rate of intermediate components in the prior Fischer-Tropsch synthesis technology needs to be improved by combining the Fischer-Tropsch synthesis integral process, and materials or energy generated in each link are fully utilized to create greater economic benefits.
Disclosure of Invention
The invention provides a purification and regeneration method of a Fischer-Tropsch synthesis tail gas hot potash solution and a device and application thereof, which are used for solving the problems that after decarbonization, organic matters contained in the hot potash solution are too much and cannot be recycled, safety accidents are easily caused, the hot potash solution needs to be replaced, the operation is complicated, and the material and energy utilization rate is low.
Specifically, the invention is realized by the following technical scheme:
in a first aspect of the invention, there is provided a method for the purification and regeneration of a hot potash solution of a Fischer-Tropsch synthesis tail gas, comprising: and (3) drying and roasting the decarbonized hot potash solution to obtain a solid phase, condensing steam generated by drying, and mixing the condensed steam with the solid phase to obtain the purified and regenerated potassium carbonate solution.
In a second aspect of the present invention, there is provided a purification and regeneration device for a hot potash solution of a fischer-tropsch synthesis exhaust gas, the purification and regeneration device being characterized by comprising: the potassium carbonate solution storage device to be treated, the drying device, the roasting device and the mixing device are sequentially connected, the drying device is provided with a gas phase outlet, and the gas phase outlet is connected with the mixing device through a condensing device.
In a third aspect, the invention provides a method for synthesizing a Fischer-Tropsch synthesis tail gas hot potash solution, which is characterized by comprising a purification and regeneration method for the Fischer-Tropsch synthesis tail gas hot potash solution.
According to a fourth aspect of the invention, there is provided a Fischer-Tropsch synthesis apparatus comprising a purification and regeneration apparatus for a hot potash solution of a Fischer-Tropsch synthesis tail gas.
In a fifth aspect, the invention provides a purification and regeneration method of a Fischer-Tropsch synthesis tail gas hot potash solution and/or an application of a purification and regeneration device of the Fischer-Tropsch synthesis tail gas hot potash solution in the Fischer-Tropsch synthesis method and/or the Fischer-Tropsch synthesis device.
The technical scheme has the following beneficial effects:
1) And removing impurities such as organic matters in the decarbonized hot potash solution by a solute analysis and high-temperature baking method, so that the recovery rate of potassium carbonate is improved, and the production and operation cost is reduced.
2) Unlike traditional evaporating temperature, the above-mentioned one or more schemes raise the drying temperature to obtain purified regenerated potassium carbonate solution by mixing the potassium carbonate solid obtained by drying and roasting operation with the condensed liquid of the drying generated steam, so as to realize the three-phase simultaneous treatment, recovery and purification of solid, gas and liquid, and the energy generated by condensation can be used for heating the solution, thus realizing the dual utilization of materials and energy.
3) Experiments show that the purified regenerated potassium carbonate solution obtained through treatment by one or more schemes has the capacity of absorbing carbon dioxide close to that of a newly prepared potassium carbonate solution with the same concentration or a fresh potassium carbonate solution, the consumption of the potassium carbonate solution in the absorption process after crystallization, roasting, purification and recovery is 38.53g/L and 38.99g/L respectively with that of a standard potassium carbonate solution, the potassium carbonate is fully recovered and recycled through crystallization and roasting, the use efficiency of the potassium carbonate is improved, the problem of high potassium carbonate loss in a decarburization solution is well solved, meanwhile, deionized water in a washing bottle can be replaced by steam condensate, the production and operation cost is further reduced, and the method has a certain practical significance for purifying and industrialization of the potassium carbonate in decarburization liquid.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of a purification and regeneration apparatus for a hot potash solution of Fischer-Tropsch synthesis tail gas according to example 4 of the present invention;
FIG. 2 is a schematic diagram of a purification and regeneration apparatus for a hot potash solution of Fischer-Tropsch synthesis tail gas according to example 5 of the present invention;
wherein: 1. the device comprises a potassium carbonate solution storage device to be treated, a drying device, a roasting device, a mixing device, a condensing device, a decarbonizing system and a decarburization system.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The experimental procedures, which do not address the specific conditions in the examples below, are generally carried out under conventional conditions or under conditions recommended by the manufacturer.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The invention provides a purification and regeneration method of a Fischer-Tropsch synthesis tail gas hot potash solution and a device and application thereof, which are used for solving the problems that after decarbonization, organic matters contained in the hot potash solution are too much and cannot be recycled, safety accidents are easily caused, the hot potash solution needs to be replaced, the operation is complicated, and the material and energy utilization rate is low.
Specifically, the invention is realized by the following technical scheme:
in a first aspect of the invention, there is provided a method for the purification and regeneration of a hot potash solution of a Fischer-Tropsch synthesis tail gas, comprising: and (3) drying and roasting the decarbonized hot potash solution to obtain a solid phase, condensing steam generated by drying, and mixing the condensed steam with the solid phase to obtain the purified and regenerated potassium carbonate solution.
In the prior art, after the Fischer-Tropsch synthesis recycle gas is washed by a recycle gas water washing tower, part of residual organic matters such as aldehyde acid and the like still remain, the organic matters enter a hot potash solution system along with tail gas, acid-base neutralization reaction is carried out on the organic matters and potassium carbonate, the generated organic acid potassium is blocked in pipelines and equipment fillers, so that the total system resistance is increased, accidents such as flooding and the like are easy to occur, the concentration of the potassium carbonate is reduced, and the decarburization effect is poor. In addition, some technologies adopt different drying temperatures, so that the purified hot potash solution has lower purity and poor carbon dioxide adsorption capacity.
Firstly, the decarbonized hot potash solution is treated by adopting a method of drying the solvent and roasting, so that organic matters in the hot potash are removed more thoroughly, and the hot potash solution can be reused conveniently. And secondly, mixing the purified potassium carbonate solid phase with steam condensate generated by drying, wherein the adsorption capacity of the potassium carbonate solution obtained by vegetation on carbon dioxide is equivalent, which shows that the performance of the potassium carbonate solution obtained after treatment meets the practical requirement. And the heat collected in the condensation process can be used for heating the potassium carbonate solution, so that dual utilization of materials and energy is realized, and the method has great significance for industrial production.
In order to improve the utilization rate of raw materials, in view of the better carbon dioxide adsorption capability of the potassium carbonate solution obtained by the method, in one or more embodiments of the invention, the purified and regenerated potassium carbonate solution is introduced into a decarburization system for decarburization treatment again.
Preferably, the Fischer-Tropsch synthesis tail gas comprises CO and at least one of alcohols, aldehydes, acids, ketones and esters 2 . These components affect the stability of the hot potash solution and need to be removed.
Because the potassium carbonate solution obtained by the invention has better carbon dioxide adsorption capacity compared with fresh potassium carbonate solution, in one or more embodiments of the invention, the hot potash solution is purified and regenerated potassium carbonate solution and/or fresh potassium carbonate solution.
The principle of removing carbon dioxide from the hot potash solution is that an aqueous solution taking potassium carbonate as a main body is used as an absorbent to carry out the processes of acid gas absorption and solution regeneration. In order to ensure the adsorption rate of carbon dioxide, the mass concentration of the hot potash solution before decarbonization is 20-25%.
Since the Fischer-Tropsch tail gas comprises at least one of alcohol, aldehyde, acid, ketone and ester and CO 2 Thus, after the treatment by the hot potash solution, the decarbonized hot potash solution comprises KHCO 3 、CH 3 COOK、C 2 H 5 At least one of COOK, alcohol, aldehyde, acid, ketone, and ester, and CO 2 And water.
In one or more embodiments of the invention, the drying process includes spray drying or evaporative crystallization to remove solvents, including but not limited to water, from the hot potassium base solution.
Preferably, the drying temperature of the spray drying device is 150-200 ℃;
preferably, the absolute pressure of the evaporation crystallization device is 20-30 kPa, and the temperature is 90-120 ℃.
Both spray drying and evaporative crystallisation are carried out by removing the solvent from the hot potash solution.
Experiments show that the roasting temperature has a great influence on the purification process of the hot potash solution. Too low a temperature only removes residual solvent and too high a temperature causes decomposition of potassium carbonate. Thus in one or more embodiments of the invention, the firing conditions are 600 to 700 ℃ for 30 to 60 minutes.
The calcination further includes a cooling step to avoid boiling or a large amount of gas when mixed with the solution.
Further experimental study found that K after calcination treatment relative to the potassium carbonate solution obtained without calcination treatment 2 CO 3 The content is obviously higher than the K in the stock solution 2 CO 3 Content of K in decarburized sample solution by calcination 2 CO 3 The purifying effect is obvious. And after calcination at 650 ℃ K 2 CO 3 The content of the sample is higher than 600 ℃ to show that the roasting temperature has influence on the purification effect of the sample, and the K in the decarbonizing sample liquid is at 650 DEG C 2 CO 3 The purification effect is better than 600 ℃. Thus, in some embodiments, the firing temperature is 650 ℃ and the firing time is 60 minutes.
In a second aspect of the present invention, there is provided a purification and regeneration device for a hot potash solution of a fischer-tropsch synthesis exhaust gas, the purification and regeneration device being characterized by comprising: the potassium carbonate solution storage device to be treated, the drying device, the roasting device and the mixing device are sequentially connected, the drying device is provided with a gas phase outlet, and the gas phase outlet is connected with the mixing device through a condensing device.
In some embodiments, the mixing device is connected to a decarbonization system, so that the potassium carbonate solution obtained by mixing can be reused for decarbonization of the Fischer-Tropsch reaction after concentration adjustment.
Preferably, the decarbonization system is connected with a potassium carbonate solution storage device to be treated,
in order to further reduce the overall volume of the apparatus while improving the production efficiency, in some embodiments, the decarbonization system is coupled to a drying apparatus.
In a third aspect, the invention provides a method for synthesizing a Fischer-Tropsch synthesis tail gas hot potash solution, which is characterized by comprising a purification and regeneration method for the Fischer-Tropsch synthesis tail gas hot potash solution.
According to a fourth aspect of the invention, there is provided a Fischer-Tropsch synthesis apparatus comprising a purification and regeneration apparatus for a hot potash solution of a Fischer-Tropsch synthesis tail gas.
In a fifth aspect, the invention provides a purification and regeneration method of a Fischer-Tropsch synthesis tail gas hot potash solution and/or an application of a purification and regeneration device of the Fischer-Tropsch synthesis tail gas hot potash solution in the Fischer-Tropsch synthesis method and/or the Fischer-Tropsch synthesis device.
The invention will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
Example 1
The embodiment provides a purification and regeneration method of a Fischer-Tropsch synthesis tail gas hot potash solution, which comprises the following steps: feeding the decarbonized hot potash solution into an evaporation crystallization device, and evaporating and crystallizing at an absolute pressure of 20kPa and a solution heating temperature of 100 ℃ to obtain K 2 CO 3 、KHCO 3 CH (CH) 3 COOK、C 2 H 5 And a solid mixed potassium salt comprising organic acid potassium such as COOK. And (3) condensing the vapor formed by evaporation and crystallization to obtain vapor condensate for recycling. The obtained solid mixed potassium salt enters an electric heating type roasting cooling furnace screw conveyor, the screw conveyor pushes materials into a preheating section, the materials enter a roasting section after being preheated, the materials move forward along with the rotation of a cylinder body, and moisture and volatile matters in the materials are gasified at a high temperature of 650 ℃ under a micro negative pressure condition. The residence time of the material in the calcination stage was 30 minutes. The roasted material is cooled to reduce the temperature of the product to 80 ℃. And discharging the cooled product through an outlet discharge valve, dissolving the vapor condensate obtained by evaporation and crystallization as a solvent to prepare a potassium carbonate solution with the mass concentration of 25%, filtering insoluble impurities through a mechanical filter, and pumping the filtered solution into a hot potash solution decarburization system for recycling. The decarbonized hot potash solution comprises at least one of potassium carbonate and CO in alcohol, aldehyde, acid, ketone and ester 2 And water.
Example 2
The hot potash solution (mainly potassium carbonate solution containing KHCO) which is periodically replaced 3 CH (CH) 3 COOK、C 2 H 5 Potassium organic acid solution such as COOK) is pumped into a spray drying device, and spray-dried by hot air at 180deg.C to remove the solutionDrying the water until the water content is less than 1% to obtain K 2 CO 3 、KHCO 3 CH (CH) 3 COOK、C 2 H 5 And a solid mixed potassium salt comprising organic acid potassium such as COOK. And (3) condensing steam formed by spray drying to obtain steam condensate for recycling. The obtained solid mixed potassium salt enters an electric heating type roasting cooling furnace screw conveyor, the screw conveyor pushes materials into a preheating section, the materials enter a roasting section after being preheated, the materials move forwards along with the rotation of a cylinder body, and moisture and volatile matters in the materials are gasified at the high temperature of 600 ℃ under the micro negative pressure condition. The residence time of the material in the calcination stage was 60 minutes. The roasted material enters a cooling unit, and the temperature of the product is reduced to 80 ℃ by spraying water on the outer wall of the cylinder. And discharging the cooled product through an outlet discharge valve, dissolving the vapor condensate obtained by spray drying as a solvent to prepare a potassium carbonate solution with the mass concentration of 20%, filtering insoluble impurities through a mechanical filter, and pumping the filtered solution into a hot potash solution decarburization system for recycling.
Example 3
The difference from example 2 is that the solid mixed potassium salt was baked at constant temperature of 300℃at 400℃at 500℃at 650℃at 700℃at 750℃and at 800℃for 60 minutes. The rest of the procedure is the same as in example 2.
Performance testing
1. Sample weight loss test
Measuring 50mL of decarburized sample solution (hot potash solution after decarburization) and pouring the decarburized sample solution into a crucible which is dried in advance and weighed by mass, adopting hot air at 180 ℃ to carry out spray drying until no flowing liquid exists, recording the mass of the initial sample solution and the total mass of the crucible and the sample solution after roasting, putting the mixture into a muffle furnace, respectively roasting at constant temperature of 300 ℃, 400 ℃, 500 ℃, 600 ℃,650 ℃, 700 ℃,750 ℃ and 800 ℃ for 1 hour, observing the change conditions at different temperatures, weighing the mass, and calculating the weight loss at different temperatures, as shown in table 1.
Table 1 weight loss of samples at different temperatures
Note that: m in the table 1 -dry pan mass/g; m is m 2 -sample mass/g; m is m 3 -mass/g after firing with a furnace; m is m 4 Total weight of sample/g after-800 ℃; eta-recovery/%.
As is clear from Table 1, the samples have a large weight loss at different temperatures, before 400 ℃, which means that the volatile water and organic solvent are more and more at the temperature, and as the temperature increases, the organic matters and potassium salts formed by the organic matters and potassium ions are less and less, until the weight loss at 700 ℃ is only 0.03g, and the weight loss at 750 ℃ or more is increased, which means that the high temperature environment K is present 2 CO 3 Decomposition begins. Thus, one or more embodiments of the present invention select a firing temperature of 600 to 650 ℃.
2. Potassium carbonate purification rate test
Weighing 25mL of decarburized sample solution (hot potash solution after decarburization), pouring into a crucible which is dried in advance and weighed by mass, carrying out spray drying by adopting hot air at 180 ℃ until no flowing liquid exists, dehydrating and drying the solution until the water content is less than 1%, cooling and weighing, then placing into a muffle furnace, respectively roasting at the constant temperature of 600 ℃ and 650 ℃ for 1h, recording the mass of the sample solution, the total mass of the crucible and the sample solution after roasting, and dissolving the sample solution into deionized water with the same volume or steam condensate of the on-site decarburized solution with the same volume after cooling, wherein K is as in the following control experiment 2 CO 3 Titration is carried out according to content titration standards, and K is calculated 2 CO 3 The content and the result are shown in Table 2.
Control test: 25mL of the in-situ decarbonization solution was taken with bromocresol green indicator and H 2 SO 4 Titration is carried out on the standard solution, the titration is completed when the solution is titrated to be bright green, and K is calculated 2 CO 3 The content is as follows.
TABLE 2 sample purification K 2 CO 3 Content determination
As can be seen by comparison, K in the unrefined decarbonized sample solution in the control test 2 CO 3 The content is 176.5g/L, and K is dissolved in deionized water with equal volume after roasting and purifying at 600 DEG C 2 CO 3 The content is 324.8g/L, and K is purified 2 CO 3 The content is obviously higher than the K in the stock solution 2 CO 3 Content of K in decarburized sample solution by calcination 2 CO 3 The purifying effect is obvious. And after calcination at 650 ℃ K 2 CO 3 The content of the sample is higher than 600 ℃ to show that the roasting temperature has influence on the purification effect of the sample, and the K in the decarbonizing sample liquid is at 650 DEG C 2 CO 3 The purification effect is better than 600 ℃. In addition, after baking and burning at the same temperature, the solution K is dissolved by deionized water 2 CO 3 The content of the K is slightly higher than that of K after the dissolution of the steam condensate of the potassium carbonate solution 2 CO 3 The content of the aqueous solution is not quite different, which means that the steam condensate of the on-site hot potash solution can be used for replacing deionized water, so that the consumption of the deionized water is reduced, and the production and operation cost is reduced.
3. Properties of purified Potassium carbonate solution
K obtained by roasting at 650℃in example 3 above was used, respectively 2 CO 3 And the existing standard K 2 CO 3 The preparation solution is 50mL, and the proportion is: 25g K 2 CO 3 +5g activator +70g H 2 O, respectively charging No. 1 (after purification K 2 CO 3 ) No. 2 (Standard K) 2 CO 3 ) In the absorption bottle, an on-site absorption parallel comparison test is carried out, and the test is to ensure that two groups of gas volumes are equal in a parallel mode.
On-site simulation absorbing device: circulating gas from the synthesis unit passes through a water washing tower, and the gas after water washing is connected into K 2 CO 3 In the solution absorption bottle, the absorbed gas is connected into a wet gas flowmeter again, the operation is simulated under production conditions (the operation time is 55h, the total accumulated amount of the circulating gas is 430L, which is equivalent to the supplement of K) 2 CO 3 Continuous operation for 1.6 days), cumulative gas flow of the wet gas flowmeter was recorded, and correlation test analysis was performed on the absorbed absorption liquids No. 1 and No. 2, and the results are shown in table 3.
Table 3 comparison of data before and after absorption
K after purification by comparison 2 CO 3 And the existing standard K 2 CO 3 The absorption sequence related index shows that the volumes of the absorption liquid No. 1 and the absorption liquid No. 2 are respectively reduced from 50mL to 45mL and 46mL before and after absorption, and the changes are basically equivalent. The pH values of the absorption liquids of No. 1 and No. 2 after absorption are respectively 9.86 and 9.23, the absorption liquids are respectively alkaline, and the change before and after absorption is equivalent, which indicates that the purified potassium carbonate has extremely high purity, and the purpose of purification is achieved. According to K before and after absorption 2 CO 3 The concentration change condition can be seen that the consumption of the potassium carbonate solution in the absorption process and the consumption of the standard potassium carbonate solution after crystallization, roasting, purification and recovery are 38.53g/L and 38.99g/L respectively, so that the potassium carbonate is fully recovered and recycled in crystallization and roasting modes, the use efficiency of the potassium carbonate is improved, the problem of high potassium carbonate loss in decarburized solution is well solved, meanwhile, deionized water in a water washing bottle can be replaced by steam condensate, the production and operation cost is further reduced, and the method has a certain practical significance for purification and industrialization of the potassium carbonate in decarburized solution.
Example 4
As shown in fig. 1, this embodiment provides a purification and regeneration device for a hot potash solution of a fischer-tropsch synthesis exhaust gas, which includes: the potassium carbonate solution storage device 1, hong Ang device 2, roasting device 3, mixing device 4, decarbonization system 6 of waiting to handle connect gradually, drying device 2 is equipped with the gas phase export, and the gas phase export is connected with mixing device 4 through condensing equipment 5.
The working process is as follows: the hot potash solution (mainly potassium carbonate solution containing KHCO) which is periodically replaced 3 CH (CH) 3 COOK、C 2 H 5 Organic acid potassium solution such as COOK) is stored in a potassium carbonate solution storage device 1 to be treated, and is pumped into a drying device 2 to be evaporated and crystallized under the absolute pressure of 20kPa and the solution heating temperature of 110 ℃ to obtain K 2 CO 3 、KHCO 3 CH (CH) 3 COOK、C 2 H 5 Solid mixture of organic acid potassium such as COOKPotassium salt. And (3) condensing the vapor formed by evaporation and crystallization to obtain vapor condensate for recycling. The obtained solid mixed sylvite enters an electric heating type roasting cooling furnace screw conveyor, the screw conveyor pushes materials into a roasting device 3, the materials enter a roasting section after being preheated, the materials move forward along with the rotation of a cylinder body, and moisture and volatile matters in the materials are gasified at the high temperature of 600 ℃ under the micro negative pressure condition. The residence time of the material in the calcination stage was 60 minutes. The roasted material enters a cooling unit, and the temperature of the product is reduced to 80 ℃ by spraying water on the outer wall of the cylinder. The cooled product and the steam condensate obtained by the drying device 2 are mixed and dissolved in the mixing device 4 to prepare a potassium carbonate solution with the mass concentration of 20%, insoluble impurities are filtered by a mechanical filter, and the potassium carbonate solution is pumped into the hot potash solution decarburization system 6 for recycling.
Example 5
As shown in fig. 2, this embodiment provides a purification and regeneration device for a hot potash solution of a fischer-tropsch synthesis exhaust gas, which is different from embodiment 4 in that the mixing device 4 is directly connected with the drying device 2, omitting the structure of the potassium carbonate solution storage device 1 to be treated, reducing the volume of the device and improving the production efficiency.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The purification and regeneration method of the Fischer-Tropsch synthesis tail gas hot potash solution is characterized by comprising the following steps of: drying and roasting the decarbonized hot potash solution to obtain a solid phase, condensing steam generated by drying and mixing the condensed steam with the solid phase to obtain a purified and regenerated potassium carbonate solution;
introducing the purified and regenerated potassium carbonate solution into a decarburization system for decarburization treatment again;
the mass concentration of the hot potash solution before decarbonization is 20% -25%;
the drying method comprises evaporative crystallization or spray drying; the absolute pressure of the evaporative crystallization is 20-30 kPa, and the temperature is 90-120 ℃; the drying temperature of the spray drying is 150-200 ℃;
the roasting condition is 600-700 ℃ for 30-60 min.
2. The method for purifying and regenerating a hot potash solution of a fischer-tropsch synthesis off-gas according to claim 1, wherein the fischer-tropsch synthesis off-gas comprises CO and at least one of an alcohol, an aldehyde, an acid, a ketone, and an ester 2 。
3. The purification and regeneration method of a hot potash solution of a fischer-tropsch synthesis off-gas according to claim 1, wherein the hot potash solution is a purified and regenerated potassium carbonate solution and/or a fresh potassium carbonate solution.
4. The method for purifying and regenerating a hot potash solution of a Fischer-Tropsch synthesis exhaust gas according to claim 1, wherein the decarbonized hot potash solution comprises potassium carbonate and CO 2 Water and KHCO 3 、CH 3 COOK、C 2 H 5 At least one of COOK, alcohol, aldehyde, acid, ketone, and ester.
5. A fischer-tropsch synthesis process comprising a process for the clean-up regeneration of a hot potash solution of a fischer-tropsch synthesis off-gas according to any one of claims 1 to 4.
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