CN108726542A - The production method and production equipment of sodium bicarbonate - Google Patents
The production method and production equipment of sodium bicarbonate Download PDFInfo
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- CN108726542A CN108726542A CN201811030245.3A CN201811030245A CN108726542A CN 108726542 A CN108726542 A CN 108726542A CN 201811030245 A CN201811030245 A CN 201811030245A CN 108726542 A CN108726542 A CN 108726542A
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- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 title claims abstract description 115
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 65
- 229910000030 sodium bicarbonate Inorganic materials 0.000 title claims abstract description 56
- 235000017557 sodium bicarbonate Nutrition 0.000 title claims abstract description 55
- 238000006243 chemical reaction Methods 0.000 claims abstract description 116
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 108
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003513 alkali Substances 0.000 claims abstract description 47
- 239000002994 raw material Substances 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000002425 crystallisation Methods 0.000 claims abstract description 31
- 230000008025 crystallization Effects 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 25
- 239000012452 mother liquor Substances 0.000 claims abstract description 20
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims abstract description 15
- 238000004064 recycling Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims description 38
- 238000005406 washing Methods 0.000 claims description 17
- 238000009833 condensation Methods 0.000 claims description 13
- 230000005494 condensation Effects 0.000 claims description 13
- 239000011734 sodium Substances 0.000 claims description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 8
- 229910052708 sodium Inorganic materials 0.000 claims description 8
- 239000012267 brine Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 5
- 239000008234 soft water Substances 0.000 claims description 5
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 2
- 230000020477 pH reduction Effects 0.000 claims 1
- 238000000746 purification Methods 0.000 claims 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 65
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 32
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 167
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 39
- 229910002092 carbon dioxide Inorganic materials 0.000 description 37
- 235000017550 sodium carbonate Nutrition 0.000 description 26
- 229910021529 ammonia Inorganic materials 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 239000000047 product Substances 0.000 description 9
- 238000007906 compression Methods 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 230000006835 compression Effects 0.000 description 7
- 239000004615 ingredient Substances 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
- 238000001354 calcination Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000012047 saturated solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- -1 Inorganic synthese Substances 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 210000000952 spleen Anatomy 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/10—Preparation of bicarbonates from carbonates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/22—Purification
Abstract
The present invention provides a kind of production method of sodium bicarbonate and production equipments, are related to the preparation field of sodium bicarbonate, and the production method of the sodium bicarbonate includes the following steps：A) solidliquid mixture containing big and heavy alkali is provided as reaction raw materials, and the decomposed solution of containing sodium carbonate is obtained after so that the reaction raw materials is decomposed and contains CO2Decomposition gas；B) carbon gas is obtained after the purified processing of the decomposition gas, the carbon gas is passed through in the decomposed solution carries out carbonating crystallization reaction later, carbonated and obtain sodium bicarbonate and the mother liquor of recycling through being separated by solid-liquid separation after crystallization reaction terminates.The wasting of resources caused by capable of solving the problems, such as existing sodium bicarbonate production method using the production method, pollution environment, high energy consumption and of high cost, reach and improve CO2Utilization rate reduces environmental pollution, and reduces the technique effect of energy consumption and cost.
Description
Technical field
The present invention relates to the preparation fields of sodium bicarbonate, are set more particularly, to the production method and production of a kind of sodium bicarbonate
It is standby.
Background technology
Sodium bicarbonate is commonly called as sodium bicarbonate, molecular formula NaHCO3.Sodium bicarbonate is basic industrial chemicals, is widely used in food
Product, chemical reagent, Inorganic synthese, medicine, process hides, weaving, dye industry, manufacture extinguishing chemical, detergent, feed industry, environmental protection
With the fields such as agricultural.
It is pure with sodium bicarbonate filter alkali liquor dissolving mainly using soda ash as raw material at present in the production technology of sodium bicarbonate
Alkali is configured to the suitable lye of concentration, is heated to 80 DEG C, and carbonating column is entered after being filtered, is passed through in carbonating column
Carbon gas carry out carbonation reaction so that the sodium carbonate in lye is changed into sodium bicarbonate and crystallize precipitations, be then centrifuged with
The processes such as dry, finally must sodium bicarbonate product.The carbon gas used during this is kiln gas, and kiln gas is to pass through calcined limestone
Obtained CO2The gas that volume content is 38%.There is main problem existing for the production technology：
(1) using kiln gas as carbon gas, CO in the tail gas discharged after carbonation reaction2Content is reduced to 22% by 38%
, there is about 58% CO in left and right2It does not utilize, causes the serious wasting of resources and environmental pollution；
(2) to being compressed containing 38% gas, compression energy consumption is increased；
(3) of high cost using soda ash as raw material.
Invention content
The first object of the present invention is to provide a kind of production method of sodium bicarbonate, be given birth to solving existing sodium bicarbonate
The wasting of resources, pollution environment, high energy consumption and problem of high cost caused by production method.
The second object of the present invention is to provide a kind of production equipment of sodium bicarbonate, be given birth to alleviating existing sodium bicarbonate
Production production equipment can not efficiently use CO2And high energy consumption and problem of high cost.
In order to realize that the above-mentioned purpose of the present invention, spy use following technical scheme：
A kind of production method of sodium bicarbonate, includes the following steps：
A) solidliquid mixture containing big and heavy alkali is provided as reaction raw materials, is contained after so that the reaction raw materials is decomposed
The decomposed solution of sodium carbonate and contain CO2Decomposition gas；
B) obtain carbon gas after the purified processing of the decomposition gas, later by the carbon gas be passed through in the decomposed solution into
Row carbonating crystallization reaction carbonates and obtains sodium bicarbonate and the mother liquor of recycling through being separated by solid-liquid separation after crystallization reaction terminates.
A kind of production equipment of sodium bicarbonate, including：
(A) sequentially connected decomposition tower, reaction crystalizer and separator, and
(B) purifying processing device, the entrance of the purifying processing device is connect with the gas vent of the decomposition tower, described
The outlet of purifying processing device is connect with the gas access of the reaction crystalizer.
Compared with the prior art, the present invention has the advantages that：
In the production method of sodium bicarbonate provided by the invention, using the solidliquid mixture of big and heavy alkali as reaction raw materials, i.e.,
Using big and heavy alkali as reaction raw materials, then the big and heavy alkali in reaction raw materials is decomposed, obtain containing sodium carbonate decomposed solution and
Containing CO2Decomposition gas, be re-used as carbon gas after the purified processing of decomposition gas and carry out carbonating crystallization reaction, decomposed solution
With the solidliquid mixture that can obtain sodium bicarbonate after the carbonating crystallization reaction of carbon gas, the solidliquid mixture is through separation
The mother liquor for obtaining target product sodium bicarbonate afterwards and can be used for recycling.
It is to replace soda ash as reaction raw materials using big and heavy alkali, since big and heavy alkali itself is soda manufacture in the production method
Intermediate product in the process, production cost therefore can be with as reaction raw materials using big and heavy alkali well below the cost of soda ash
The production cost of sodium bicarbonate is greatly reduced, for cost of material, cost can reduce by 50% or more.
In addition, in production method in the present invention, the carbon gas obtained after the purified processing of decomposition gas is the carbon of high-purity
Change gas, CO2Content can reach 90% or more, to be significantly larger than the CO of the kiln gas used in conventional production methods2Content.
The CO of high-purity2With Na2CO3Reaction rate it is very fast, final reaction efficiency can reach 90% or more, and conventional carbon
The kiln gas that sour hydrogen process for producing sodium uses, reaction efficiency only has 40% or so, in contrast, CO2Utilization rate obtain substantially
It improves, the tail gas amount discharged after carbonating crystallization reaction is reduced to the 20% of traditional handicraft hereinafter, reducing in turn to ring
The pollution in border.Simultaneously as CO in carbon gas2The increase of content needs the CO of isodose2When gas, the gas of required compression
Total amount reduces, to reduce the compression energy consumption of gas.
The production equipment of sodium bicarbonate provided by the invention includes the decomposition tower for decomposing big and heavy alkali, for carrying out carbon
The reaction crystalizer of acidizing crystal reaction, the purifying processing device for purifying decomposition gas, and for detaching sodium bicarbonate
Separator, wherein decomposition tower, reaction crystalizer and separator are sequentially connected, and big and heavy alkali obtains carbon containing after decomposition tower decomposition
The decomposed solution of sour sodium and contain CO2Decomposition gas, from decomposition tower be discharged the purified processing of decomposition gas after be passed through reaction crystalizer again
Middle carry out carbonation reaction.Sodium bicarbonate is produced using the production equipment, decomposition gas can be made to be fully utilized, improved simultaneously
The purity of carbon gas, and then improve CO2Reaction efficiency, reduce environmental pollution.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the structural schematic diagram of the production equipment of one embodiment of the present invention；
Fig. 2 is the process flow chart of the production method of one embodiment of the present invention.
Icon：10- mixers；20- heat exchangers；21- condensers；22- washers；23- compressors；30- decomposition towers；40-
Reaction crystalizer；50- centrifuges；60- driers.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.
On the one hand, the present invention provides a kind of production method of sodium bicarbonate, include the following steps：
A) solidliquid mixture containing big and heavy alkali is provided as reaction raw materials, is contained after so that the reaction raw materials is decomposed
The decomposed solution of sodium carbonate and contain CO2Decomposition gas；
B) obtain carbon gas after the purified processing of the decomposition gas, later by the carbon gas be passed through in the decomposed solution into
Row carbonating crystallization reaction carbonates and obtains sodium bicarbonate and the mother liquor of recycling through being separated by solid-liquid separation after crystallization reaction terminates.
In the production method of sodium bicarbonate provided by the invention, using the solidliquid mixture of big and heavy alkali as reaction raw materials, i.e.,
Using big and heavy alkali as reaction raw materials, then the big and heavy alkali in reaction raw materials is decomposed, obtain containing sodium carbonate decomposed solution and
Containing CO2Decomposition gas, be re-used as carbon gas after the purified processing of decomposition gas and carry out carbonating crystallization reaction, decomposed solution
With the solidliquid mixture that can obtain sodium bicarbonate after the carbonating crystallization reaction of carbon gas, the solidliquid mixture is through separation
The mother liquor for obtaining target product sodium bicarbonate afterwards and can be used for recycling.
It is to replace soda ash as reaction raw materials using big and heavy alkali, since big and heavy alkali itself is soda manufacture in the production method
Intermediate product in the process, production cost therefore can be with as reaction raw materials using big and heavy alkali well below the cost of soda ash
The production cost of sodium bicarbonate is greatly reduced, for cost of material, cost can reduce by 50% or more.Wherein, big and heavy alkali is consolidated
Solid-to-liquid ratio for example can be 5%-50% in liquid mixture.
In addition, in production method in the present invention, the carbon gas obtained after the purified processing of decomposition gas is the carbon of high-purity
Change gas, CO2Content can reach 90% or more, to be significantly larger than the CO of the kiln gas used in conventional production methods2Content.
The CO of high-purity2With Na2CO3Reaction rate it is very fast, final reaction efficiency can reach 90% or more, and conventional carbon
The kiln gas that sour hydrogen process for producing sodium uses, reaction efficiency only has 40% or so, in contrast, CO2Utilization rate obtain substantially
It improves, the tail gas amount discharged after carbonating crystallization reaction is reduced to the 20% of traditional handicraft hereinafter, reducing in turn to ring
The pollution in border.Meanwhile the carbon gas obtained after purified treatment is passed through in decomposed solution after supercharging and carries out carbonation reaction, due to carbon
Change CO in gas2The increase of content needs the CO of isodose2When gas, the gas gross of required compression reduces, to reduce
The compression energy consumption of gas.
In the preparation process of soda ash, following processing step can be generally undergone：1. the preparation of ammonial brine；2. ammonial brine
Carbonation reaction simultaneously crystallizes to obtain solidliquid mixture；3. big and heavy alkali solid is obtained by filtration in solidliquid mixture；4. big and heavy alkali calcining and decomposing
Obtain soda ash.Wherein, the main component of big and heavy alkali is NaHCO3, while a certain amount of NH can be contained4HCO3And NaCl, later slightly
Weight alkali obtains soda ash Na through calcining again2CO3.The a large amount of decomposition gas that will produce during the calcining and decomposing of big and heavy alkali, the decomposition gas
Main component be carbon dioxide, water vapour and ammonia mixed gas, due to CO2Na can be used as2CO3Carbonating crystallization is anti-
The reaction gas answered, therefore obtained by the purified treatment of decomposition gas with removing vapor in decomposition gas and ammonia
The carbon gas of high-purity.This method not only can be to avoid the wasting of resources and environmental pollution caused by the directly outer row of decomposition gas, but also can be with
The reaction efficiency of carbonating crystallization reaction is improved using the carbon gas of high-purity, while improving CO2Utilization rate, reduce CO2
Outer row lead.
After carbonating crystallization reaction in the present invention, the solidliquid mixture containing sodium bicarbonate can be obtained, solid-liquid is mixed
It closes object and obtains sodium bicarbonate and the mother liquor for recycling after separation of solid and liquid.Mother liquor for recycling is that the saturation of sodium bicarbonate is molten
Liquid, meanwhile, contain a certain amount of Na2CO3And the source of NaCl, NaCl are raw material weight in wet base alkali.The mother liquor of recycling can be used as molten
Agent continues to dissolve big and heavy alkali, or the outer row of selection.But in order to make the mother liquor of recycling be fully utilized, in some of the present invention
In embodiment, partially recycled mother liquor can be taken to re-dissolve big and heavy alkali again as solvent, arranged outside another part, outer discharge capacity can
To control in 1-10m3/ h can be such that the content of salt in reaction raw materials does not accumulate, and then make the carbon of output by the outer row of mother liquor
The content of salt is maintained at a lower level in sour hydrogen sodium product, reaches pharmaceutical grade level.
In certain embodiments of the present invention, CO in the carbon gas obtained by the purified processing of decomposition gas2Volume fraction
>=90%.
By controlling CO in carbon gas2Content, can further increase carbonating crystallization reaction reaction efficiency, improve
CO2Utilization rate, be further reduced CO2Discharge capacity.
In certain embodiments of the present invention, the decomposition temperature of reaction raw materials can be for example 60-150 DEG C, in this point
At a temperature of solution, the resolution ratio of big and heavy alkali can be controlled in the range of 70%-85%, can both make the bicarbonate in big and heavy alkali
Ammonia fully decomposes, and can retain a part of sodium bicarbonate and not be decomposed, and avoids the waste of the energy.
It can be 30-90 DEG C to carbonate the reaction temperature in crystallization reaction for example.The process for carbonating crystallization reaction can be with
It is carried out by the way of gradually cooling down, quickly and effectively carbonation reaction can be carried out at a relatively high temperature in this way, together
When can be crystallized at relatively low temperature, to improve the product of sodium bicarbonate.
In certain embodiments of the present invention, the decomposition gas successively it is condensed and washing after complete purified treatment.Its
In, the condensation temperature in condensation process for example can be 10-70 DEG C.Cleaning solution used in carrying out washing treatment can be soft water or essence
Salt manufacturing water.As further preferred embodiment of the present invention, the decomposition gas first transfers heat to reaction raw materials through heat exchange
Afterwards, then purified treatment is completed in condensed successively and washing.Wherein, in heat transfer process, the flow velocity of decomposition gas is 5-50m/s, reaction
The flow velocity of raw material is 1-10m/s.The flow velocity of reaction raw materials is slightly less than the flow velocity of decomposition gas, and heat exchange can be improved using the flow velocity
Effective percentage ensures that the heat of decomposition gas can be reflected stoste absorption to the maximum extent.
The main component of decomposition gas is vapor, CO2With a small amount of ammonia.The decomposition gas that reaction raw materials obtain after decomposing
Temperature is very high, in order to recycle heat, avoids the waste of energy, can utilize the method to exchange heat by the heat transfer of decomposition gas to anti-
It answers raw material to preheat reaction raw materials, while cooling down to decomposition gas, then carry out the condensation and washing of decomposition gas again.
Decomposition gas by exchange heat cool down after carry out condensation cooling, vapor is condensed into liquid water, ammonia in condensation process,
The water that is largely condensed is taken away to form water containing ammonia condensing, and water containing ammonia condensing can be recovered to original soda ash preparation facilities.
The ingredient of decomposition gas by condensation is the CO containing a small amount of ammonia2Gas, which is washed later, into one
The ammonia of step washing the inside.Cleaning solution uses soft water or refined brine, the wash water after washing to can be used for the salt dissolving process of soda ash,
Decomposition gas after washing is that volume content is 90% or more CO2High-pure gas.
The CO of the high-purity2Gas, through overcompression, is sent to point as carbon gas after being pressurized to 0.1-0.6MPa from normal pressure
It solves in liquid, carbonating crystallization reaction is carried out with decomposed solution.Because of the CO that carbon gas at this time is high-purity of the content more than 90%2,
Compared to CO2The kiln gas that content is 38%, for needing the CO of same tolerance2Reaction, the total amount of the carbon gas needed is reduced to original
1/3 or more come, therefore, can substantially save the energy consumption of compression process.
In certain embodiments of the present invention, it provides containing CO2Gas as make-up gas, the make-up gas and institute
Purified treatment is carried out again after stating decomposition gas mixing, obtains carbon gas later；
Or,
It provides and contains CO2Gas as make-up gas, be passed through in the decomposed solution after the purified processing of make-up gas
Carry out carbonation reaction；
Preferably, the make-up gas is the calciner gas generated in alkali producing process.
In order to ensure that the amount of carbon gas disclosure satisfy that the carbonating crystallization reaction of decomposed solution fully carries out, can in addition supplement
It is a certain amount of to contain CO2Gas.For example, the calciner gas during soda manufacture may be used is as make-up gas, with decomposition
After gas is condensed and washed together, it is passed through in decomposed solution compress together after and carries out carbonating crystallization reaction.Calciner gas
The ingredient of main component and decomposition gas is essentially identical, predominantly vapor, CO2With a small amount of ammonia.
On the other hand, the present invention provides a kind of production equipment of sodium bicarbonate, including：
(A) sequentially connected decomposition tower, reaction crystalizer and separator, and
(B) purifying processing device, the entrance of the purifying processing device is connect with the gas vent of the decomposition tower, described
The outlet of purifying processing device is connect with the gas access of the reaction crystalizer.
The production equipment of sodium bicarbonate provided by the invention includes the decomposition tower for decomposing big and heavy alkali, for carrying out carbon
The reaction crystalizer of acidizing crystal reaction, the purifying processing device for purifying decomposition gas, and for detaching sodium bicarbonate
Separator, wherein decomposition tower, reaction crystalizer and separator are sequentially connected, and big and heavy alkali obtains carbon containing after decomposition tower decomposition
The decomposed solution of sour sodium and contain CO2Decomposition gas, from decomposition tower be discharged the purified processing of decomposition gas after be passed through reaction crystalizer again
Middle carry out carbonation reaction.Sodium bicarbonate is produced using the production equipment, the decomposition gas obtained after big and heavy caustic digestion can be made to obtain
To make full use of, while the purity of carbon gas is improved, and then improves CO2Reaction efficiency, reduce environmental pollution.
The course of work of production equipment provided by the invention is：Solidliquid mixture containing big and heavy alkali is placed in decomposition tower
In, big and heavy alkali is decomposed in heating, to obtain the decomposed solution of containing sodium carbonate and contain CO2Decomposition gas.Decomposition gas is from decomposition tower
Into in purifying processing device, and decomposed solution is then entered by decomposition tower in reaction crystalizer.Decomposition gas is from purifying processing device stream
Enter reaction crystalizer after going out and carry out carbonating crystallization reaction with decomposed solution, sodium bicarbonate is obtained after carbonating crystallization reaction
Solidliquid mixture, solidliquid mixture enters separator, target product carbonic acid obtained after separator is separated by solid-liquid separation
Hydrogen sodium and recyclable mother liquor.
In certain embodiments of the present invention, pass through gas between the purifying processing device and the reaction crystalizer
Supercharging device connects.Carbon gas is obtained after the purified processing of decomposition gas, carbon gas is passed through decomposition after gas pressurized device increase
In liquid.Gas pressurized device device such as can be gas compressor or pulsometer.
In certain embodiments of the present invention, the purifying processing device includes sequentially connected condenser and washing
Device, the gas vent of the decomposition tower are connect with the entrance of the condenser；The outlet of the washer connects the gas and increases
The entrance of pressure device, the outlet of the gas pressurized device connect the gas access of the reaction crystalizer.In the present invention into one
It walks in preferred embodiment, heat exchanger, the gas vent of the decomposition tower is equipped between the decomposition tower and the condenser
It is connect with the gas access of the heat exchanger, the gas vent of the heat exchanger is connect with the entrance of the condenser；It is described to change
The liquid inlet of hot device is connect with mixer, and the liquid outlet of the heat exchanger is connect with the liquid inlet of the decomposition tower.
The temperature of decomposition gas that reaction raw materials obtain after decomposing is very high, in order to recycle heat, avoids the waste of energy, can be with
The heat transfer of decomposition gas preheats reaction raw materials to reaction raw materials using heat exchanger, while decomposition gas is dropped
Temperature, then decomposition gas sequentially enter condensation and washer again.
For decomposition gas by further being cooled down into condenser after the cooling that exchanges heat, vapor is condensed into liquid water, ammonia
Gas is in condensation process, and the water that is largely condensed is taken away to form water containing ammonia condensing, and water containing ammonia condensing can be recovered to original pure
Alkali preparation facilities.
Ingredient by the decomposition gas of condenser is the CO containing a small amount of ammonia2Gas, the gas enter washer later,
The further ammonia of washing the inside.Cleaning solution uses soft water or refined brine, the wash water after washing to can be used for the salt dissolving of soda ash
Process, the decomposition gas after washing are that volume content is 90% or more CO2High-pure gas.
In certain embodiments of the present invention, the reaction crystalizer is forced circulation crystallizer, including interior cycle knot
Brilliant device and outer circulation crystallizer, preferably Olso steam crystallizer, referred to as OSL crystallizers.
More traditional needle-shaped sodium bicarbonate crystal crystallize anti-using forced circulation crystallizer, such as OSL crystallizers
It answers, obtained sodium bicarbonate crystal particle balling preparation shape, and particle is big, it is non-breakable, it is easy to centrifuge.
In certain embodiments of the present invention, the separator includes centrifuge and drier, the centrifuge
Entrance is connect with the liquid outlet of the reaction crystalizer；Optionally, the liquid outlet of the centrifuge is connect with mixer.
The solidliquid mixture containing sodium bicarbonate that reaction crystalizer comes out, needs to be separated by solid-liquid separation into centrifuge, from
Scheming is thrown away in the solid come containing 4% or so moisture, and target product bicarbonate is obtained after further being dried by drier
Sodium.Wherein, the liquid outlet of centrifuge is connect with mixer, can be sent into partially recycled mother liquor in mixer for dissolving
The mother liquor of big and heavy alkali, another part recycling is arranged outside, can be sent into the process units of soda ash.
Below in conjunction with embodiment, the present invention will be further described in detail.
Embodiment 1
As shown in Figure 1, the present embodiment is a kind of production equipment of sodium bicarbonate, including sequentially connected mixer 10, change
Hot device 20, decomposition tower 30, reaction crystalizer 40 and centrifuge 50, liquid since mixer 10 followed by heat exchanger 20, point
Solve tower 30, reaction crystalizer 40 and centrifuge 50.The liquid outlet of centrifuge 50 is connect with mixer 10.Wherein, reactive crystallization
Device 40 is OSL crystallizers.
In addition, the gas vent of decomposition tower 30 is connect with the gas access of heat exchanger 20, the gas vent of heat exchanger 20 with
The gas access of condenser 21 connects, and the gas vent of condenser 21 is connect with the gas access of washer 22, washer 22
Gas vent is connect with the entrance of compressor 23, and the outlet of compressor 23 is connect with the gas access of reaction crystalizer 40, is decomposed
Gas, followed by heat exchanger 20, condenser 21 and washer 22, finally leads to after the compression of compressor 23 after the outflow of decomposition tower 30
Enter in reaction crystalizer 40 and carries out carbonating crystallization reaction with decomposed solution.The sodium bicarbonate of gained after carbonating crystallization reaction
Solidliquid mixture enter centrifuge 50 and detached, obtain sodium bicarbonate and the mother liquor for recycling.
Mother liquor for recycling is entered by the liquid outlet of centrifuge 50 in mixer 10, is re-used, with
In the big and heavy alkali of dissolving.
Embodiment 2
The present embodiment is a kind of production method of sodium bicarbonate, and the production equipment provided using embodiment 1 is produced, and is schemed
2 show that the technological process of the production method, the big and heavy alkali generated in the process using soda manufacture in this method are main as raw material
Ingredient is：70.88% NaHCO3, 7.02% Na2CO3, 4.14% NH4HCO3, 0.2% NaCl's and 17.76%
H2O, the specific production method include the following steps：
A) in a mixer, by big and heavy alkali soluble in the saturated solution of sodium bicarbonate, solid-liquid mixing is obtained after mixing
Object dissolves precipitation of the big and heavy alkali convenient for sodium bicarbonate crystalline solid in subsequent process with the saturated solution of sodium bicarbonate；Wherein, solid-liquid
The solid-to-liquid ratio of mixture is 1：10；
B) solidliquid mixture enters decomposition tower after flowing through heat exchanger, in decomposition tower, the big and heavy alkali hair in solidliquid mixture
The decomposed solution of containing sodium carbonate is obtained after solution estranged and contains CO2Decomposition gas；The decomposition temperature control of decomposition reaction is at 95 DEG C, the mistake
NaHCO in journey3Resolution ratio is 75%；
The main component of decomposed solution is to contain Na2CO3With a small amount of NaHCO3Aqueous solution, decomposed solution from decomposition tower outflow after
Into reaction crystalizer, feed liquor temperature is controlled at 50 DEG C；
The main component of decomposition gas is vapor and CO2And containing a small amount of ammonia, the temperature of decomposition gas is very high, in order to
Heat is recycled, decomposition gas flows to heat exchanger after the outflow of the gas vent of decomposition tower, and consolidating containing big and heavy alkali is given by heat exchanger
Liquid mixture is preheated, while reducing the temperature of itself；
In heat transfer process, the flow velocity of decomposition gas is 30m/s, and the flow velocity of reaction raw materials is 6m/s；
C) enter in condenser after decomposition gas is cooled down by heat exchanger and further cooled down, vapor is within the condenser
It is condensed into liquid water, the most ammonia water that is condensed in condensation process is taken away, and water containing ammonia condensing is formed；What is formed is cold containing ammonia
Condensate can be recovered to the production that soda ash is participated in original soda ash device, it is made to be effectively utilized；The condensation temperature of the process
Degree is 30 DEG C；
It is CO that it is ingredient that decomposition gas, which flows through the main component after condenser,2Gas contains the gaseous mixture of a small amount of ammonia simultaneously,
The gaseous mixture enters in washer the ammonia for further washing the inside later, and cleaning solution uses soft water, the wash water generated after washing
It can be used for the salt dissolving process of soda ash so that it is recycled, the carbon gas obtained after washing is CO2Content 90% with
Upper high-pure gas；
Because of the CO in decomposition gas2Tolerance it is slightly insufficient, require supplementation with a small amount of CO2The gas of gas, supplement can be arbitrary
Form contains CO2Gas；The present embodiment is used as make-up gas using the calciner gas generated during soda manufacture, and divides
It vents one's spleen and is sent into condenser progress condensation process together；The main component of calciner gas and the ingredient of decomposition gas are essentially identical, mainly
For vapor, CO2And ammonia；
D) carbon gas of the high-purity obtained by step c) passes through compressor, after normal pressure is pressurized to 0.2MPa, is sent to anti-
It answers and carries out carbonating crystallization reaction in crystallizer with the decomposed solution in reaction crystalizer, reaction temperature is 70 DEG C；
Because of the CO in carbon gas2Content is higher, compares CO2For the kiln gas that content is 38%, for needing same tolerance
CO2Reaction, need the carbonization tolerance compressed to be reduced to original 1/3, therefore discharge gas Qty of compressor reduces, and compression is greatly saved
The power consumption of machine；
E) after carbonating crystallization reaction, what is obtained in reaction crystalizer is the solidliquid mixture of sodium bicarbonate, should
Solidliquid mixture is separated by solid-liquid separation after reaction crystalizer outflow into centrifuge, and centrifuge, which is thrown away in the solid come, to be contained
4% or so moisture obtains target product sodium bicarbonate further by drier；The mother liquor separated through centrifuge,
Main component is saturated sodium bicarbonate solution, while containing partial sodium carbonate and micro NaCl, and a part of of the mother liquor can make
Solvent to dissolve big and heavy alkali, which is again introduced into from centrifuge in mixer, to be recycled, and another then can drain into soda ash in addition
The production of soda ash is used in process units, outer displacement control to be in 2m3/ h makes the content of salt in the systematic stock solution not accumulate, output
The content of salt is maintained at a lower level to reach pharmaceutical grade in Sodium bicarbonate product.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of production method of sodium bicarbonate, which is characterized in that include the following steps：
A) solidliquid mixture containing big and heavy alkali is provided as reaction raw materials, obtains containing carbonic acid after making the reaction raw materials decompose
The decomposed solution of sodium and contain CO2Decomposition gas；
B) carbon gas is obtained after the purified processing of the decomposition gas, the carbon gas is passed through in the decomposed solution carries out carbon later
Acidizing crystal reacts, and carbonates and obtains sodium bicarbonate and the mother liquor of recycling through being separated by solid-liquid separation after crystallization reaction terminates.
2. the production method of sodium bicarbonate according to claim 1, which is characterized in that CO in the carbon gas2Volume point
Number >=90%.
3. the production method of sodium bicarbonate according to claim 1, which is characterized in that the decomposition temperature of reaction raw materials controls
At 60-150 DEG C.
4. according to the production method of claim 1-3 any one of them sodium bicarbonates, which is characterized in that the decomposition gas is successively
Purified treatment is completed after condensed and washing；
Preferably, the condensation temperature in condensation process is 10-70 DEG C；
Preferably, cleaning solution used in carrying out washing treatment is soft water or refined brine.
5. the production method of sodium bicarbonate according to claim 4, which is characterized in that the decomposition gas first will be warm through heat exchange
After amount passes to reaction raw materials, then purified treatment is completed in condensed successively and washing；
Preferably, in heat transfer process, the flow velocity of decomposition gas is 5-50m/s, and the flow velocity of reaction raw materials is 1-10m/s.
6. according to the production method of claim 1-3 any one of them sodium bicarbonates, which is characterized in that provide and contain CO2Gas
As make-up gas, the make-up gas carries out purified treatment again after being mixed with the decomposition gas, obtains carbon gas later；
Or,
It provides and contains CO2Gas as make-up gas, be passed through in the decomposed solution after the purified processing of make-up gas and carry out carbon
Acidification reaction；
Preferably, the make-up gas is the calciner gas generated in alkali producing process.
7. according to the production method of claim 1-3 any one of them sodium bicarbonates, which is characterized in that a part of recycling
Recycling solution dissolve big and heavy alkali as mother liquor to reuse to step a), another part discharge.
8. a kind of production equipment of sodium bicarbonate, which is characterized in that including：
(A) sequentially connected decomposition tower, reaction crystalizer and separator, and
(B) purifying processing device, the entrance of the purifying processing device are connect with the gas vent of the decomposition tower, the purification
The outlet of processing unit is connect with the gas access of the reaction crystalizer.
9. the production equipment of sodium bicarbonate according to claim 8, which is characterized in that the purifying processing device with it is described
It is connected by gas pressurized device between reaction crystalizer；
Preferably, the purifying processing device includes sequentially connected condenser and washer, the gas vent of the decomposition tower
It is connect with the entrance of the condenser；The outlet of the washer connects the entrance of the gas pressurized device, and the gas increases
The outlet of pressure device connects the gas access of the reaction crystalizer；
Preferably, heat exchanger is equipped between the decomposition tower and the condenser, the gas vent of the decomposition tower is changed with described
The gas access of hot device connects, and the gas vent of the heat exchanger is connect with the entrance of the condenser；
Preferably, the liquid inlet of the heat exchanger is connect with mixer, the liquid outlet of the heat exchanger and the decomposition tower
Liquid inlet connection.
10. the production equipment of sodium bicarbonate according to claim 8 or claim 9, which is characterized in that the reaction crystalizer is strong
Circulation crystallization device processed, including interior circulation crystallization device and outer circulation crystallizer, preferably OSL crystallizers；
Preferably, the separator includes centrifuge and drier, the entrance of the centrifuge and the reaction crystalizer
Liquid outlet connects；
Preferably, the liquid outlet of the centrifuge is connect with mixer.
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| CN109761248A (en) * | 2019-03-12 | 2019-05-17 | 谢精忠 | Sodium bicarbonate preparation facilities and preparation method |
| CN110015669A (en) * | 2019-02-12 | 2019-07-16 | 合肥久诺医药科技有限公司 | A kind of sodium bicarbonate preparation method and equipment |
| CN110759360A (en) * | 2019-11-27 | 2020-02-07 | 天津理工大学 | Method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkali liquor |
| CN111704149A (en) * | 2020-05-27 | 2020-09-25 | 山东海天生物化工有限公司 | Process for producing sodium bicarbonate |
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