CN112537784A - System and method for extracting sodium thiocyanate from coal gas desulfurization solution - Google Patents
System and method for extracting sodium thiocyanate from coal gas desulfurization solution Download PDFInfo
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- CN112537784A CN112537784A CN202011492802.0A CN202011492802A CN112537784A CN 112537784 A CN112537784 A CN 112537784A CN 202011492802 A CN202011492802 A CN 202011492802A CN 112537784 A CN112537784 A CN 112537784A
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- sodium thiocyanate
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C3/00—Cyanogen; Compounds thereof
- C01C3/20—Thiocyanic acid; Salts thereof
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
- C01D1/22—Preparation by reacting oxides or hydroxides with alkali metal salts with carbonates or bicarbonates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/28—Purification; Separation
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention discloses a system and a method for extracting sodium thiocyanate from gas desulfurization solution, belongs to the technical field of gas desulfurization, and provides the system for extracting the sodium thiocyanate from the gas desulfurization solution, which has relatively low cost and a product outlet path. The method can realize the extraction of the sodium thiocyanate product from the gas desulfurization solution, and can obtain the sodium hydroxide mixed solution product so as to realize the effective utilization of resources; meanwhile, the extracted product sodium thiocyanate has better market demand.
Description
Technical Field
The invention relates to the technical field of gas desulfurization, in particular to a system and a method for extracting sodium thiocyanate from a gas desulfurization solution.
Background
The ultralow emission of the production in the coking industry is taken as the key work of national environmental protection governance, so that an important quality index of the coke oven gas is H2S content, the factory gas of domestic coking enterprises contains H2S generally requires 20mg/Nm3The cobalt-based catalytic oxidation desulfurization and glue baking process (PDS process for short) is commonly adopted in the following, and the byproduct salt generated by the process mainly contains NaCNS and Na2S2O3、Na2SO4、Na2CO3There is a great problem with the utilization of (b). The method is mainly poor in economy, needs to consume alcohol substances in separation and purification, is high in safety requirement, is high in production cost due to repeated dissolution and crystallization, and is low in product added value, so that the utilization of secondary salt generated by coke oven gas desulfurization of domestic enterprises becomes a big problem, and the method for extracting sodium thiocyanate from the gas desulfurization solution with relatively low cost and outgoing products is very important.
Disclosure of Invention
The invention aims to provide a system for extracting sodium thiocyanate from gas desulfurization solution with relatively low cost and a product outlet.
The technical scheme adopted by the invention for solving the technical problems is as follows: the system for extracting sodium thiocyanate from coal gas desulfurization solution comprises a neutralization reactor, a desulfurization solution inlet pipeline of the neutralization reactor, a material outlet pipeline of the neutralization reactor, a filter liquid outlet pipeline, a filter solid outlet, an active carbon decolorizer liquid outlet pipe, a distillation concentrator, a steam outlet pipe, a steam condenser, a concentrated solution outlet pipeline, a crystallizer, a sodium hydroxide mixed solution outlet pipeline, a sodium thiocyanate conveyor and a heavy crystallizer; a desulfurization liquid inlet pipeline of a neutralization reactor is connected with the neutralization reactor to supply desulfurization liquid materials, the neutralization reactor supplies the treated liquid materials to a filter through a neutralization reactor material outlet pipeline, the filter supplies the filtered liquid materials to an active carbon decolorizer through a filter liquid outlet pipeline, meanwhile, the filter discharges filtered solids through a filter solid outlet, the active carbon decolorizer supplies the treated liquid materials to a distillation concentrator through an active carbon decolorizer liquid outlet pipe, the distillation concentrator supplies steam generated by evaporation to a steam condenser through a steam outlet pipe to condense the steam into condensed water and then discharges the condensed water, the distillation concentrator supplies the concentrated liquid materials to a crystallizer through a concentrated liquid outlet pipeline, crystallized materials generated by the crystallizer are supplied to a recrystallization device through a sodium thiocyanate conveyor to obtain sodium thiocyanate products, and simultaneously discharging liquid level materials produced after crystallization of the crystallizer through a sodium hydroxide mixed liquid outlet pipeline to obtain a sodium hydroxide mixed liquid product.
Further, the method comprises the following steps: the packaging machine is used for packaging the recrystallized sodium thiocyanate product material through the sodium thiocyanate packaging machine.
In addition, the invention also provides a method for extracting sodium thiocyanate from the gas desulfurization solution, and the method is a system for extracting sodium thiocyanate from the gas desulfurization solution, and comprises the following steps:
a. the coal gas desulfurization solution is supplied to the neutralization reactor through a desulfurization solution inlet pipeline of the neutralization reactor, and NaCNS and Na in the coal gas desulfurization solution2S2O3、Na2SO4And Na2CO3Reacts with Ba (OH) added into the neutralization reactor to generate BaS2O3、BaSO4And BaCO3And a mixture of NaCNS and NaOH;
b. the reacted mixture is output from the bottom of the neutralization reactor and is supplied to a filter through a material outlet pipeline of the neutralization reactor; filter for mixing BaS2O3、BaSO4And BaCO3Discharging solid obtained by filtering the precipitate through a solid outlet of the filter;
c. the filter supplies the filtered liquid material to an active carbon decolorizer through a filter liquid outlet pipeline for decolorization treatment;
d. supplying the decolored water to a distillation concentrator for distillation and concentration, condensing water vapor generated in the distillation process of the distillation concentrator into condensed water through a steam condenser, and discharging the condensed water; the concentrated liquid produced by distillation of the distillation concentrator is supplied to the crystallizer through a concentrated liquid outlet pipeline;
e. cooling and crystallizing the concentrated solution in a crystallizer to generate a NaCNS crystallized primary product, wherein the residual liquid after the concentrated solution is crystallized is mainly NaOH mixed solution which is discharged through a sodium hydroxide mixed solution outlet pipeline;
and f, feeding the NaCNS crystallized primary product to a recrystallization machine through a sodium thiocyanate conveyor for recrystallization, wherein the recrystallization process comprises the steps of dissolving the fed NaCNS crystallized primary product with hot water, cooling for recrystallization, and recrystallizing to obtain a NaCNS recrystallized product.
Further, the method comprises the following steps: and the NaOH mixed liquor is discharged through a sodium hydroxide mixed liquor outlet pipeline and then is sent back to the coal gas desulfurization system for recycling.
The invention has the beneficial effects that: the system and the method can realize the extraction of sodium thiocyanate products from the gas desulfurization solution and the production of sodium hydroxide mixed solution products so as to realize the effective utilization of resources; meanwhile, the extracted product sodium thiocyanate has better market demand. The system has the advantages of relatively low cost, product export and the like, and can be widely popularized and applied to recovery treatment of the gas desulfurization solution.
Drawings
FIG. 1 is a schematic view showing the connection relationship of a system for extracting sodium thiocyanate from a gas desulfurization solution according to the present invention;
labeled as: the system comprises a neutralization reactor 1, a neutralization reactor desulfurization liquid inlet pipeline 2, a neutralization reactor material outlet pipeline 3, a filter 4, a filter liquid outlet pipeline 5, a filter solid outlet 6, an activated carbon decolorizer 7, an activated carbon decolorizer liquid outlet pipe 8, a distillation concentrator 9, a steam outlet pipe 10, a steam condenser 11, a concentrated liquid outlet pipeline 12, a crystallizer 13, a sodium hydroxide mixed liquid outlet pipeline 14, a sodium thiocyanate conveyor 15, a re-crystallizer 16 and a sodium thiocyanate packaging machine 17.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
It should be noted that, if there are directional indication terms, such as the terms of direction and orientation, above, below, left, right, front and back, in the present invention, for facilitating the description of the relative positional relationship between the components, the absolute position that is not the positional relationship between the related components and the components is specifically referred to, and is only used for explaining the relative positional relationship and the motion situation between the components in a specific posture, and if the specific posture is changed, the directional indication is changed accordingly. When the present invention relates to a number, such as "a plurality", "several", etc., two or more than two are specifically referred to.
As shown in fig. 1, the system for extracting sodium thiocyanate from gas desulfurization solution comprises a neutralization reactor 1, a neutralization reactor desulfurization solution inlet pipeline 2, a neutralization reactor material outlet pipeline 3, a filter 4, a filter liquid outlet pipeline 5, a filter solid outlet 6, an activated carbon decolorizer 7, an activated carbon decolorizer liquid outlet pipe 8, a distillation concentrator 9, a steam outlet pipe 10, a steam condenser 11, a concentrated solution outlet pipeline 12, a crystallizer 13, a sodium hydroxide mixed solution outlet pipeline 14, a sodium thiocyanate conveyor 15 and a re-crystallizer 16; a desulfurization liquid inlet pipeline 2 of a neutralization reactor is connected with the neutralization reactor 1 to supply desulfurization liquid materials, the neutralization reactor 1 supplies the treated liquid materials to a filter 4 through a neutralization reactor material outlet pipeline 3, the filter 4 supplies the filtered liquid materials to an active carbon decolorizer 7 through a filter liquid outlet pipeline 5, the filter 4 discharges filtered solids through a filter solids outlet 6, the active carbon decolorizer 7 supplies the treated liquid materials to a distillation concentrator 9 through an active carbon decolorizer liquid outlet pipe 8, the distillation concentrator 9 supplies steam generated by evaporation to a steam condenser 11 through a steam outlet pipe 10 to condense the steam into condensed water and then discharge the condensed water, the distillation concentrator 9 supplies the concentrated liquid materials to a crystallizer 13 through a concentrated liquid outlet pipeline 12, crystallized materials crystallized by the crystallizer 13 are supplied to a recrystallization crystallizer 16 through a sodium thiocyanate conveyor 15 to obtain the sulfur crystallizer 16 And discharging the sodium cyanate product and the liquid level material crystallized in the crystallizer 13 through a sodium hydroxide mixed liquid outlet pipeline 14 to obtain a sodium hydroxide mixed liquid product.
The invention also provides a method for extracting sodium thiocyanate from the gas desulfurization solution, which is a system for extracting sodium thiocyanate from the gas desulfurization solution, and specifically comprises the following steps:
a. the gas desulfurization solution is supplied to a neutralization reactor 1 through a neutralization reactor desulfurization solution inlet pipeline 2, and NaCNS and Na in the gas desulfurization solution2S2O3、Na2SO4And Na2CO3Reacts with Ba (OH) added into the neutralization reactor 1 to generate BaS2O3、BaSO4And BaCO3And solutions of NaCNS and NaOH;
b. the reacted mixture is output from the bottom of the neutralization reactor 1 and is supplied to a filter 4 through a neutralization reactor material outlet pipeline 3; filter 4 mixing BaS2O3、BaSO4And BaCO3The solid obtained by filtering the precipitate is discharged through a solid outlet 6 of the filter; of course, the solid material discharged through the filter 4 can be further used for coal blending or sold directly for earning benefits;
c. the filter 4 supplies the filtered liquid material to an active carbon decolorizer 7 through a filter liquid outlet pipeline 5 for decolorization treatment;
d. supplying the decolored water to a distillation concentrator 9 for distillation and concentration, condensing water vapor generated in the distillation process of the distillation concentrator 9 into condensed water through a steam condenser 11, and discharging the condensed water; the concentrated liquid produced by distillation of the distillation concentrator 9 is supplied to a crystallizer 13 through a concentrated liquid outlet pipeline 12; the condensed water can be recycled, so that the cost is saved;
e. cooling and crystallizing the concentrated solution in a crystallizer 13 to generate a NaCNS crystallized primary product, wherein the residual liquid after the concentrated solution is crystallized is mainly NaOH mixed solution which is discharged through a sodium hydroxide mixed solution outlet pipeline 14; the NaOH mixed solution is discharged through the sodium hydroxide mixed solution outlet pipeline 14 and then is sent back to the coal gas desulfurization system for recycling;
the NaCNS crystal primary product is supplied to a recrystallization device 16 through a sodium thiocyanate conveyor 15 for recrystallization, the recrystallization process is to dissolve the fed NaCNS crystal primary product with hot water, cool the product for recrystallization, and obtain a recrystallization product of NaCNS after recrystallization; by recrystallization, a higher quality NaCNS crystalline product can be obtained.
In addition, this is still further provided with sodium thiocyanate packagine machine 17 in, be used for through sodium thiocyanate packagine machine 17 with the sodium thiocyanate finished product of recrystallization packing to subsequent transportation and storage etc..
Claims (5)
1. The system for extracting sodium thiocyanate from coal gas desulfurization solution is characterized in that: the device comprises a neutralization reactor (1), a neutralization reactor desulfurization liquid inlet pipeline (2), a neutralization reactor material outlet pipeline (3), a filter (4), a filter liquid outlet pipeline (5), a filter solid outlet (6), an activated carbon decolorizer (7), an activated carbon decolorizer liquid outlet pipe (8), a distillation concentrator (9), a steam outlet pipe (10), a steam condenser (11), a concentrated liquid outlet pipeline (12), a crystallizer (13), a sodium hydroxide mixed liquid outlet pipeline (14), a sodium thiocyanate conveyor (15) and a re-crystallizer (16); a neutralization reactor desulfurization liquid inlet pipeline (2) is connected with a neutralization reactor (1) to supply desulfurization liquid materials, the neutralization reactor (1) supplies the treated liquid materials to a filter (4) through a neutralization reactor material outlet pipeline (3), the filter (4) supplies the filtered liquid materials to an activated carbon decolorizer (7) through a filter liquid outlet pipeline (5), the filter (4) discharges filtered solids through a filter solid outlet (6), the activated carbon decolorizer (7) supplies the treated liquid materials to a distillation concentrator (9) through an activated carbon decolorizer liquid outlet pipe (8), the distillation concentrator (9) supplies steam generated by evaporation to a steam condenser (11) through a steam outlet pipe (10) to condense the steam into condensed water and then discharges the condensed steam, the distillation concentrator (9) supplies the concentrated liquid materials to a crystallizer (13) through a concentrated liquid outlet pipeline (12), and the crystallized material generated by crystallization of the crystallizer (13) is supplied to a recrystallization crystallizer (16) through a sodium thiocyanate conveyor (15) to be recrystallized to obtain sodium thiocyanate, and simultaneously the liquid level material generated by crystallization of the crystallizer (13) is discharged through a sodium hydroxide mixed liquid outlet pipeline (14) to obtain sodium hydroxide mixed liquid.
2. The system for extracting sodium thiocyanate from gas desulfurization solution as set forth in claim 1, wherein: and the packaging machine (17) is used for packaging the recrystallized sodium thiocyanate into a finished product through the packaging machine (17).
3. The method for extracting sodium thiocyanate from gas desulfurization solution, which adopts the system for extracting sodium thiocyanate from gas desulfurization solution as described in claim 1, comprises the following steps:
a. the coal gas desulfurization solution is supplied to the neutralization reactor (1) through a neutralization reactor desulfurization solution inlet pipeline (2), and NaCNS and Na in the coal gas desulfurization solution2S2O3、Na2SO4And Na2CO3Reacts with Ba (OH) added into the neutralization reactor (1) to generate BaS2O3、BaSO4And BaCO3And a mixture of NaCNS and NaOH;
b. the reacted mixture is output from the bottom of the neutralization reactor (1) and is supplied to a filter (4) through a neutralization reactor material outlet pipeline (3); filter (4) mixing BaS2O3、BaSO4And BaCO3The solid obtained by filtering the precipitate is discharged through a solid outlet (6) of the filter;
c. the filter (4) supplies the filtered liquid material to an active carbon decolorizer (7) through a filter liquid outlet pipeline (5) for decolorization treatment;
d. after the decoloration treatment, the water is supplied to a distillation concentrator (9) for distillation concentration treatment, and water vapor generated in the distillation process of the distillation concentrator (9) is condensed into condensed water through a steam condenser (11) and then discharged; the concentrated liquid produced by distillation of the distillation concentrator (9) is supplied to the crystallizer (13) through a concentrated liquid outlet pipeline (12);
e. cooling and crystallizing the concentrated solution in a crystallizer (13) to generate a NaCNS crystallized primary product, wherein the residual liquid after the concentrated solution is crystallized is mainly NaOH mixed solution which is discharged through a sodium hydroxide mixed solution outlet pipeline (14);
and f, feeding the NaCNS crystal primary product to a recrystallization device (16) through a sodium thiocyanate conveyor (15) for recrystallization, wherein the recrystallization process comprises the steps of dissolving the fed NaCNS crystal primary product with hot water, cooling for recrystallization, and recrystallizing to obtain a recrystallized product of NaCNS.
4. The method for extracting sodium thiocyanate from gas desulfurization solution as set forth in claim 3, wherein: the NaOH mixed liquor is discharged through a sodium hydroxide mixed liquor outlet pipeline (14) and then is sent back to the coal gas desulfurization system for recycling.
5. The method for extracting sodium thiocyanate from gas desulfurization solution as set forth in claim 3 or 4, wherein: the packaging machine also comprises a sodium thiocyanate packaging machine (17), and the recrystallized sodium thiocyanate is packaged into a finished product through the sodium thiocyanate packaging machine (17).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492802.0A CN112537784A (en) | 2020-12-16 | 2020-12-16 | System and method for extracting sodium thiocyanate from coal gas desulfurization solution |
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| CN202011492802.0A CN112537784A (en) | 2020-12-16 | 2020-12-16 | System and method for extracting sodium thiocyanate from coal gas desulfurization solution |
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2020
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| CN111362280A (en) * | 2020-03-16 | 2020-07-03 | 临涣焦化股份有限公司 | System and method for preparing sodium thiocyanate and sodium sulfate from desulfurization waste liquid |
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Application publication date: 20210323 |