CN108862333A - The preparation method of sodium bicarbonate - Google Patents

The preparation method of sodium bicarbonate Download PDF

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Publication number
CN108862333A
CN108862333A CN201811030426.6A CN201811030426A CN108862333A CN 108862333 A CN108862333 A CN 108862333A CN 201811030426 A CN201811030426 A CN 201811030426A CN 108862333 A CN108862333 A CN 108862333A
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sodium bicarbonate
mother liquor
temperature
preparation
big
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CN108862333B (en
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宋国天
唐印
龚元德
雷林
孔德利
刘朝慧
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Beijing Edgein Technology Co Ltd
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Beijing Edgein Technology Co Ltd
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    • 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
    • C01D7/24—Crystallisation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/80—Compositional purity

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention provides a kind of preparation methods of sodium bicarbonate, are related to the preparation field of sodium bicarbonate, and the preparation method of the sodium bicarbonate includes the following steps：A) saturated solution of sodium bicarbonate under temperature T1 is provided as mother liquor, and the big and heavy alkali containing sodium bicarbonate generated in alkali producing process and the mother liquor are mixed to get solidliquid mixture；B) solidliquid mixture is warming up to temperature T2 makes big and heavy alkali be completely dissolved to obtain solution, and the solution temperature, which is down to temperature T1, later is precipitated sodium bicarbonate, obtains the mother liquor of the sodium bicarbonate and recycling through being separated by solid-liquid separation.Using the preparation method can be avoided in the prior art sodium bicarbonate as the auxiliary product of soda manufacture line be made caused by production operation long flow path, technical problem complicated for operation and high energy and material consumption, reached simple flow and energy-saving technical effect.

Description

The preparation method of sodium bicarbonate
Technical field
The present invention relates to sodium bicarbonate preparation fields, more particularly, to a kind of preparation method of sodium bicarbonate.
Background technique
Sodium bicarbonate, chemical formula NaHCO3, also referred to as sodium bicarbonate, generally by soda ash Na2CO3, landing alkali or not Qualified alkali carries out carbonating again and is prepared, and actually and the auxiliary product as soda manufacture line is made, sodium bicarbonate Production process in reaction it is as follows：
Soda manufacture core reaction:
NH3+H2O+CO2→NH4HCO3
NaCl+NH4HCO3→NH4Cl+NaHCO3↓
Big and heavy alkali calcination reaction:
NH4HCO3→NH3↑+H2O↑+CO2↑
NaHCO3→Na2CO3+H2O↑+CO2↑
Produce sodium bicarbonate:
Na2CO3+H2O+CO2→NaHCO3↓
It experienced the preparation of 1. ammonial brine in above-mentioned production technology；2. ammonial brine carbonation reaction simultaneously crystallizes to obtain solid-liquid mixing Object；3. big and heavy alkali solid is obtained by filtration in solidliquid mixture；4. big and heavy alkali calcining and decomposing obtains soda ash；5. soda ash carries out carbonating again anti- Answer and etc..In core reaction, four kinds of ion combination of two at four kinds of compounds in, NaHCO3Solubility it is minimum, most First crystallize out.In order to improve raw material availability, that is, the utilization rate of Na as far as possible, Na is generally required+/NH4 +Molar ratio reaches 1:1.1, with NaHCO3Constantly crystallization is precipitated, Na+/NH4 +Molar ratio constantly reduces.The ratio is close to 1 in end point mother liquor:3.4. This is bound to cause part NH in solution4HCO3With NaHCO3It is precipitated together.As for NH4HCO3In NaHCO3Substitution rate in crystallization, Mainly by Na in solution+/NH4 +The influence of ratio.Obtained crystalline mixture is reacted, removes remained on surface mother liquor by washing After salinity, referred to as big and heavy alkali.Wherein NH4HCO3Mass fraction can not ignore, even up to 4-5% sometimes.
In above-mentioned preparation process, big and heavy alkali main component has been sodium bicarbonate, the calcining and decomposing of big and heavy alkali, actually It goes to carbonate.The carbonating again of this and sodium bicarbonate is inverse process.It is this past from the perspective of using sodium bicarbonate as final products Be again it is extremely unreasonable, there is a problem of that production procedure is long, complicated for operation and energy and material consumption is high.Why now also with this Kind unreasonable production procedure, be because：1) still think little of its independence using sodium bicarbonate as the subsidiary product of soda manufacture line Property；2) it has been sodium carbonate that although big and heavy alkali is most of, product purity still has suitable distance apart from up to standard, still needs to special Processing；3) sodium bicarbonate and ammonium hydrogen carbonate have labile property, and the two easily forms collineality, with common washing side Method can not separate.And it also there have been no the technical report that sodium bicarbonate is directly prepared using big and heavy alkali at present.
In view of this, the present invention is specifically proposed.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation methods of sodium bicarbonate, to avoid the work of sodium bicarbonate in the prior art For soda manufacture line auxiliary product be made caused by production operation long flow path, technology complicated for operation and high energy and material consumption ask Topic.
In order to realize above-mentioned purpose of the invention, spy uses following technical scheme：
A kind of preparation method of sodium bicarbonate, includes the following steps：
A) saturated solution of sodium bicarbonate under temperature T1 is provided as mother liquor, contains bicarbonate for what is generated in alkali producing process The big and heavy alkali and the mother liquor of sodium are mixed to get solidliquid mixture；
B) solidliquid mixture is warming up to temperature T2 makes big and heavy alkali be completely dissolved to obtain solution, later by the solution Temperature, which is down to temperature T1, is precipitated sodium bicarbonate, obtains the mother liquor of the sodium bicarbonate and recycling through being separated by solid-liquid separation.
Further, difference >=10 DEG C of temperature T2 and temperature T1, for example, the difference of temperature T2 and temperature T1 are in 10~50 DEG C of models In enclosing.
Further, the value range of T1 is 20~50 DEG C, and the value range of T2 is 40~75 DEG C.
Further, the value range of T1 is 30~45 DEG C, and the value range of T2 is 50~70 DEG C.
Further, in the big and heavy alkali, the weight percentage of ammonium hydrogen carbonate is 1~5%.
Further, gained sodium bicarbonate is placed in the mother liquor under temperature T1, carries out the knot again of the step b) later Brilliant process carries out the purifying of sodium bicarbonate.
Further, the purification process repeats, such as number of repetition is twice or repeatedly, preferably number of repetition is 2~5 times.
Further, the mother liquor recycle of the recycling to step a) reuse.
Further, the mother liquor recycle of a part of recycling is reused to step a), and another part is discharged.
Further, the mother liquor in step a) is prepared by big and heavy alkali.
Compared with the prior art, the present invention has the advantages that：
The preparation method of sodium bicarbonate provided by the invention is for generating in alkali producing process containing the thick of sodium bicarbonate Weight alkali carries out recrystallization operation to obtain sodium bicarbonate.Mother liquor in the present invention is the saturated solution of sodium bicarbonate, for carbonic acid Hydrogen ammonium is unsaturated.Since the dissolubility difference of sodium bicarbonate and ammonium hydrogen carbonate at different temperatures is larger, at any temperature, The solubility of ammonium hydrogen carbonate is all significantly greater than sodium bicarbonate；Meanwhile as the temperature rises, sodium bicarbonate and ammonium hydrogen carbonate is molten Xie Du is increased trend, and the increasing degree of ammonium hydrogen carbonate is bigger, therefore, passes through the saturated solution pair with sodium bicarbonate Big and heavy alkali, which carries out recrystallization, can all stay ammonium hydrogen carbonate in the solution, obtain the very high sodium bicarbonate solid of purity, avoid The calcining of the big and heavy alkali for the pollution weight that temperature is high, equipment is huge, energy consumption is high and the carbonation of soda ash.Preparation of the invention Method has the advantages that equipment is few, step is few, operating condition is mild and low energy consumption.
Simultaneously as ammonium bicarbonate content is not high in big and heavy alkali, it is every to pass through a recrystallization process, the bicarbonate in mother liquor Ammonium content rises considerably less, and along with ammonium bicarbonate solubility degree is very big, mother liquor is repeatable to be recycled many times.
Detailed description of the invention
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 be briefly described, it should be apparent that, it is 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, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the curve graph of the solubility with temperature variation of sodium bicarbonate provided by the invention and ammonium hydrogen carbonate；
Fig. 2 is the process flow chart of the preparation method for the sodium bicarbonate that the embodiment of the present invention 1 provides；
Fig. 3 is the process flow chart of the preparation method for the sodium bicarbonate that the embodiment of the present invention 2 provides.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is The conventional products that can be obtained by commercially available purchase.
One aspect of the present invention provides a kind of preparation method of sodium bicarbonate, especially commercial scale preparation method, Include the following steps：
A) saturated solution of sodium bicarbonate under temperature T1 is provided as mother liquor, contains bicarbonate for what is generated in alkali producing process The big and heavy alkali and the mother liquor of sodium are mixed to get solidliquid mixture；
B) solidliquid mixture is warming up to temperature T2 makes big and heavy alkali be completely dissolved to obtain solution, later by the solution Temperature, which is down to temperature T1, is precipitated sodium bicarbonate, obtains the mother liquor of the sodium bicarbonate and recycling through being separated by solid-liquid separation.
The preparation method of sodium bicarbonate provided by the invention is for generating in alkali producing process containing the thick of sodium bicarbonate Weight alkali carries out recrystallization operation to obtain sodium bicarbonate.Mother liquor in the present invention is the saturated solution of sodium bicarbonate, for carbonic acid Hydrogen ammonium is unsaturated.Since the dissolubility difference of sodium bicarbonate and ammonium hydrogen carbonate at different temperatures is larger, at any temperature, The solubility of ammonium hydrogen carbonate is all significantly greater than sodium bicarbonate；Meanwhile as the temperature rises, sodium bicarbonate and ammonium hydrogen carbonate is molten Xie Du is increased trend, and the increasing degree of ammonium hydrogen carbonate is bigger, therefore, passes through the saturated solution pair with sodium bicarbonate Big and heavy alkali, which carries out recrystallization, can all stay ammonium hydrogen carbonate in the solution, obtain the very high sodium bicarbonate solid of purity, avoid The calcining of the big and heavy alkali for the pollution weight that temperature is high, equipment is huge, energy consumption is high and the carbonation of soda ash.Preparation of the invention Method has the advantages that equipment is few, step is few, operating condition is mild and low energy consumption.
Simultaneously as ammonium bicarbonate content is not high in big and heavy alkali, it is every to pass through a recrystallization process, the bicarbonate in mother liquor Ammonium content rises considerably less, and along with ammonium bicarbonate solubility degree is very big, mother liquor is repeatable to be recycled many times.
Recrystallization is the process to crystallize out from solution again after crystal is dissolved in solution.Involved in the present invention Recrystallization method carries out substance purification using the difference of sodium bicarbonate and ammonium bicarbonate solubility degree, since mother liquor is sodium bicarbonate Saturated solution, therefore not will cause any loss to sodium bicarbonate.
In the present invention, temperature T2 is higher than temperature T1, but does not make restriction to specific temperature T1 and temperature T2, as long as The solubility of sodium bicarbonate at two temperatures can be made to generate difference.The selection of specific temperature can be according to production energy Consumption, production efficiency and output determine.
It should be noted that the mother liquor in the present invention is the saturated solution of sodium bicarbonate, the right and wrong for ammonium hydrogen carbonate Saturation.Big and heavy alkali is placed in the mother liquor, temperature T1 is heated to from temperature T1 to improve the solubility of sodium bicarbonate, makes big and heavy Alkali is completely dissolved；Cool down again and return to initial temperature temperature T1, then can all be recrystallized out from the sodium bicarbonate of big and heavy alkali Come, and the ammonium hydrogen carbonate from big and heavy alkali has then all stayed in mother liquor, to realize point of sodium bicarbonate and ammonium hydrogen carbonate From.
In certain embodiments of the present invention, difference >=10 DEG C of temperature T2 and temperature T1.Optionally, temperature T2 and temperature The difference of T1 is within the scope of 10~50 DEG C.
The temperature difference of T2 and T1 is bigger, sodium bicarbonate and ammonium bicarbonate solubility just more thoroughly.Meanwhile the temperature difference greatly can be with one Secondary property dissolves more sodium bicarbonates and ammonium hydrogen carbonate, improves production efficiency.
Wherein, the difference of temperature T2 and temperature T1 for example can for 10 DEG C, 12 DEG C, 15 DEG C, 17 DEG C, 20 DEG C, 22 DEG C, 25 DEG C, 27 DEG C, 30 DEG C, 32 DEG C, 35 DEG C, 37 DEG C, 40 DEG C, 42 DEG C, 45 DEG C, 47 DEG C or 50 DEG C.
In certain embodiments of the present invention, the value range of T1 is 20~50 DEG C, and the value range of T2 is 40~75 ℃.Optionally, the value range of T1 is 30~45 DEG C, and the value range of T2 is 50~70 DEG C.
Under conditions of meeting difference >=10 DEG C of temperature T2 and temperature T1, temperature T1 chooses between 20~50 DEG C, temperature T2 chooses between 40~75 DEG C, and energy consumption can be reduced in the case where taking into account sodium bicarbonate solubility.For example, temperature T1 It can be 20 DEG C, 22 DEG C, 25 DEG C, 27 DEG C, 30 DEG C, 32 DEG C, 35 DEG C, 37 DEG C, 40 DEG C, 42 DEG C, 45 DEG C, 47 DEG C or 50 DEG C；Temperature T2 can be 40 DEG C, 42 DEG C, 45 DEG C, 47 DEG C, 50 DEG C, 52 DEG C, 55 DEG C, 57 DEG C, 60 DEG C, 62 DEG C, 65 DEG C, 67 DEG C, 70 DEG C or 75 ℃。
In certain embodiments of the present invention, in the big and heavy alkali, the weight percentage of ammonium hydrogen carbonate is 1~5%. For example, the weight percentage of ammonium hydrogen carbonate can for 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5% or 5%.
In certain embodiments of the present invention, in the mother liquor, Na+With NH4 +Molar ratio be greater than 1:3.
In mother liquor, NH can not contained4 +, this is also the most perfect condition of mother liquor.It, can but for the recycling of mother liquor Using select to contain certain ammonium hydrogen carbonate sodium bicarbonate saturated solution as mother liquor.NH in mother liquor in order to prevent4 +Excessive concentration Ammonium hydrogen carbonate is caused to be precipitated, the Na in mother liquor+With NH4 +Molar ratio be greater than 1:3.
In certain embodiments of the present invention, gained sodium bicarbonate is placed in the mother liquor under temperature T1, is carried out later The recrystallization process of the step b), carries out the purifying of sodium bicarbonate.By repeated recrystallize process, carbon can be further improved The purity of sour hydrogen sodium.For example, the purification process may be repeated, such as number of repetition is secondary twice or repeatedly, preferably to repeat Number can be 2~5 times.
In certain embodiments of the present invention, the mother liquor of recycling being capable of repeated recycling utilize.In some embodiments, The mother liquor recycle all recycled to step a) reuse.
Due to using the NH in post mother liquor every time4 +Content rising is very slow, and such mother liquor can be used many times with repetitive cycling, Until NH in mother liquor4 +Ion more to isomorphous effect shows, and certain update is then carried out to mother liquor.When update, add in step a) Enter new mother liquor.In some embodiments, new mother liquor can be prepared by big and heavy alkali.In some embodiments, new mother liquor is by carbon Sour hydrogen sodium is prepared.In some embodiments, when update, the mother liquor recycle of a part recycling to step a) can be repeated into benefit With another part discharge.It in some embodiments, can be in step a) all using new mother liquor, by whole recycling when update Mother liquor discharge.
In certain embodiments of the present invention, the big and heavy alkali containing sodium bicarbonate generated in alkali producing process passes through following Reaction obtains：
NH3+H2O+CO2→NH4HCO3
NaCl+NH4HCO3→NH4Cl+NaHCO3↓
In big and heavy alkali, by weight percentage, 95% the above are NaHCO3, NH4HCO3Weight ratio less than 5%.
Fig. 1 is the curve graph of the solubility with temperature variation of sodium bicarbonate and ammonium hydrogen carbonate.From dissolubility picture, appoint The solubility of ammonium hydrogen carbonate is all significantly greater than the solubility of sodium bicarbonate at a temperature of one.With the raising of temperature, sodium bicarbonate and carbon The solubility of sour hydrogen ammonium is all increased trend, and the increasing degree of ammonium hydrogen carbonate is bigger, so the dissolution of ammonium hydrogen carbonate is not It is problem.Sodium bicarbonate and carbonic acid can be efficiently separated using the difference of the solubility of sodium bicarbonate and ammonium hydrogen carbonate at identical temperature Hydrogen ammonium.
Prepare mother liquor, at a certain temperature, the sodium bicarbonate in mother liquor has been saturated, but ammonium hydrogen carbonate does not reach saturation Point.For example, big and heavy alkali soluble can be made such mother liquor in quantitative water.Big and heavy alkali is placed in the mother liquor, is heated to another One temperature is completely dissolved big and heavy alkali to improve solubility；Cool down again and return to initial temperature, then from the bicarbonate of big and heavy alkali Sodium all can recrystallize out, and the ammonium hydrogen carbonate from big and heavy alkali has then all stayed in mother liquor, to realize carbonic acid The decomposition of hydrogen sodium and ammonium hydrogen carbonate.Due to Na in mother liquor+/NH4 +Molar ratio is much higher than the reaction crystallization process of traditional soda manufacture, A possibility that forming isomorphous very little.Mother liquor may be reused.Due to using the NH in post mother liquor every time4 +Content rising is very slow, Mother liquor can be used with repetitive cycling many times, until NH in this way4 +More to isomorphous effect shows, then carries out centainly more to mother liquor Newly.
Below in conjunction with embodiment and comparative example, the present invention will be further described in detail.
Embodiment 1
As shown in Fig. 2, the present embodiment is a kind of preparation method of sodium bicarbonate, include the following steps：
The saturated solution that step a) provides sodium bicarbonate at 40 DEG C is used as mother liquor, and the amount of pure water is 2600g, mother in the mother liquor The amount of sodium bicarbonate is 330g in liquid, is placed in the big and heavy alkali containing sodium bicarbonate generated in 100g alkali producing process at 40 DEG C Solidliquid mixture is obtained in mother liquor；
The temperature of solidliquid mixture is warming up to 60 DEG C by step b) is dissolved completely in big and heavy alkali in mother liquor, later by mother liquor Temperature, which is down to 40 DEG C, is precipitated sodium bicarbonate, obtains sodium bicarbonate through being separated by solid-liquid separation.
Wherein, the purity of the sodium bicarbonate obtained is 99%.
Wherein, 96g NaHCO is contained in the big and heavy alkali of 100g3With 4g NH4HCO3。
The calculating process of mother liquor dosage is as follows：NaHCO3Solubility at 40 DEG C and 60 DEG C is respectively 12.7g/100gH2O And 16.4g/100gH2O.Assuming that existing M grams of a certain amount of mother liquor, wherein the amount of pure water is m grams, the M grams of mother liquor at 40 DEG C It is saturated solution for sodium bicarbonate, by 96g NaHCO3Fairly insoluble state can be in by being placed in 40 DEG C of mother liquor, 96g NaHCO after mother liquor temperature is risen to 60 DEG C at this time3It is completely dissolved, and sodium bicarbonate is in a saturated state after solution, thus M × 12.7/100+96=m × 16.4/100 can be obtained, m=2600g can be obtained by being computed.By big and heavy alkali soluble mother Yu of 100g at 40 DEG C In liquid, and 60 DEG C are heated to, the NaHCO in big and heavy alkali3And NH4HCO3All dissolutions, then drop back to 40 DEG C, 96g are precipitated again NaHCO3, and NH4HCO3Then stay in mother liquor.A recrystallization process is completed at this time.
The NaHCO that 2600g pure water is dissolved at 40 DEG C3Amount be 2600 × 12.7/100=330g, 2600g at 60 DEG C The NaHCO that pure water is dissolved3Amount be 426g, so pure water and NaHCO in initial mother liquor3Amount be 2600+330=2930.
Calculation specifications NH will be passed through below4HCO3The reason of will not being precipitated.
Assuming that containing a certain amount of NH in mother liquor4HCO3, as contained 155g NH in 40 DEG C of mother liquors4HCO3, this for For mother liquor containing 2600g pure water, NH4HCO3Concentration is 6g/100gH2O, NH when being far below 40 DEG C4HCO3Solubility 36.6g/100gH2O.NaHCO in mother liquor at this time3/NH4HCO3Mass ratio is (330+96)/(155+4), Na+/NH4 +Molar ratio (330/84)/(155/79)=1：0.5；Sodium bicarbonate and ammonium hydrogen carbonate are all dissolved in mother liquor at 60 DEG C, at this time in mother liquor NaHCO3/NH4HCO3Mass ratio is (330+96)/(155+4), Na+/NH4 +Molar ratio be ((330+96)/84)/((155+4)/ 79)=1:0.4, much higher than the Na in soda manufacture in initial reaction raw material+/NH4 +Molar ratio 1:1.1.Even if cooling the temperature to 40 DEG C to 96gNaHCO3Na after precipitation, in mother liquor+/NH4 +Molar ratio be also only ((330)/84)/((155+4)/79)= 1:0.51, even more much higher than the Na in reaction solution in soda manufacture terminal+/NH4 +Molar ratio 1:3.4.It is female in recrystallization process Liquid is in this Na always+More NH4 +Few atmosphere generates NH4HCO3A possibility that eutectic, greatly reduces, obtained NaHCO3It is brilliant Body purity is very high.
From the example above calculating, it can also be seen that, it can be used repeatedly for recrystallization post mother liquor.The every circulation primary of mother liquor, the inside NaHCO3Content is constant, NH4HCO3Content increases.By taking the big and heavy alkali and mother liquor of said ratio as an example, to make the NH in mother liquor4HCO3 Solubility be raised to 6g/100gH from 02O, it has been necessary to recycle 35 times or more；If will be close to NH4HCO3Saturation solubility follows Ring number is up to 200 times or more.
Embodiment 2
As shown in figure 3, the present embodiment is a kind of preparation method of sodium bicarbonate, it is different from the process flow in embodiment 1 Place is that sodium bicarbonate is prepared by re-crystallization cycles twice in the preparation method of the present embodiment, specifically, including following Step：
The saturated solution that step a) provides sodium bicarbonate at 40 DEG C contains carbon as mother liquor, and by what is generated in alkali producing process The big and heavy alkali of sour hydrogen sodium, which is placed in mother liquor, obtains solidliquid mixture；
Step b) is once recrystallized：The temperature of solidliquid mixture, which is warming up to 60 DEG C, makes big and heavy alkali be dissolved completely in mother liquor In, mother liquor temperature, which is down to 40 DEG C, later is precipitated sodium bicarbonate, obtains sodium bicarbonate first separation object through being separated by solid-liquid separation；
Step c) recycles the liquid obtained after being separated by solid-liquid separation in primary recrystallization, and it is big and heavy to be re-used as mother liquor dissolution Alkali, or outlet processing is carried out to the mother liquor obtained after separation of solid and liquid；
Step d)：There is provided the saturated solution of sodium bicarbonate at 40 DEG C as mother liquor, again by sodium bicarbonate first separation object It is placed in mother liquor；
Step e) secondary recrystallization：Being warming up to 60 DEG C is dissolved completely in sodium bicarbonate first separation object in mother liquor, later Mother liquor temperature, which is down to 40 DEG C, is precipitated sodium bicarbonate, obtains sodium bicarbonate through being separated by solid-liquid separation；
Step f) recycles the liquid obtained after being separated by solid-liquid separation in secondary recrystallization, and it is big and heavy to be re-used as mother liquor dissolution Alkali or sodium bicarbonate first separation object, or outlet processing is carried out to the mother liquor obtained after separation of solid and liquid.
Wherein, the purity of the sodium bicarbonate obtained is 99.6%.
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, those skilled in the art should understand that：Its according to So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into Row equivalent replacement；And these are modified or replaceed, 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 preparation method of sodium bicarbonate, which is characterized in that include the following steps：
A) saturated solution of sodium bicarbonate under temperature T1 is provided as mother liquor, by what is generated in alkali producing process containing sodium bicarbonate Big and heavy alkali and the mother liquor are mixed to get solidliquid mixture；
B) solidliquid mixture is warming up to temperature T2 makes big and heavy alkali be completely dissolved to obtain solution, later by the solution temperature Being down to temperature T1 is precipitated sodium bicarbonate, obtains the mother liquor of the sodium bicarbonate and recycling through being separated by solid-liquid separation.
2. the preparation method of sodium bicarbonate according to claim 1, which is characterized in that difference >=10 of temperature T2 and temperature T1 DEG C, for example, the difference of temperature T2 and temperature T1 are within the scope of 10~50 DEG C.
3. the preparation method of sodium bicarbonate according to claim 2, which is characterized in that the value range of T1 is 20~50 DEG C, the value range of T2 is 40~75 DEG C.
4. the preparation method of sodium bicarbonate according to claim 3, which is characterized in that the value range of T1 is 30~45 DEG C, the value range of T2 is 50~70 DEG C.
5. the preparation method of sodium bicarbonate according to claim 1-4, which is characterized in that in the big and heavy alkali, The weight percentage of ammonium hydrogen carbonate is 1~5%.
6. the preparation method of sodium bicarbonate according to claim 1-4, which is characterized in that by gained sodium bicarbonate It is placed in the mother liquor under temperature T1, carries out the recrystallization process of the step b) later, carry out the purifying of sodium bicarbonate.
7. the preparation method of the sodium bicarbonate according to claim 6, which is characterized in that the purification process repeats It carries out, such as number of repetition is twice or repeatedly, preferably number of repetition is 2~5 times.
8. the preparation method of sodium bicarbonate according to claim 1-4, which is characterized in that the mother liquor of the recycling It is recycled to step a) recycling.
9. the preparation method of sodium bicarbonate according to claim 1-4, which is characterized in that a part of recycling Mother liquor recycle to step a) reuse, another part discharge.
10. the preparation method of sodium bicarbonate according to claim 1-4, which is characterized in that the institute in step a) Stating mother liquor at least partly is prepared by big and heavy alkali.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030698A1 (en) * 1999-10-25 2001-05-03 Airborne Industrial Minerals Inc. Method for formulating food grade sodium bicarbonate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001030698A1 (en) * 1999-10-25 2001-05-03 Airborne Industrial Minerals Inc. Method for formulating food grade sodium bicarbonate

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