CN110304640A - A kind of sodium bicarbonate production method - Google Patents
A kind of sodium bicarbonate production method Download PDFInfo
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- CN110304640A CN110304640A CN201910636136.4A CN201910636136A CN110304640A CN 110304640 A CN110304640 A CN 110304640A CN 201910636136 A CN201910636136 A CN 201910636136A CN 110304640 A CN110304640 A CN 110304640A
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- mother liquor
- sodium bicarbonate
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/16—Halides of ammonium
- C01C1/164—Ammonium chloride
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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
- C01D7/02—Preparation by double decomposition
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- Organic Chemistry (AREA)
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- Engineering & Computer Science (AREA)
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- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention discloses a kind of sodium bicarbonate production methods, including metathesis reaction process and ammonium chloride separation and mend salt process, the technology of the present invention is with following the utility model has the advantages that energy saving, since the technical solution of separating ammonium chloride of the present invention does not need to carry out heating evaporating, concentrating and crystallizing to mother liquor, also decrease temperature crystalline is not carried out to mother liquor, but the electrodialysis plant group high-efficient, low energy consumption is used, compared to existing process technology scheme, energy consumption reduces 20%-35%；Due to not having heating, cooling, the natural content state of sodium bicarbonate will not change in mother liquor, and sodium bicarbonate yield is caused to promote 10%-15%；Because not cooling down to mother liquor, the incrustation of production pipeline system is reduced, and production stability is much improved.Because not heating up to mother liquor, the mother liquor containing a large amount of ammonium chlorides is greatly reduced equipment corrosion；Present invention process route is closed circulating operation production, in addition to product, does not discharge dirt externally, meets environmental protection fundamental policy.
Description
Technical field
The present invention relates to chemical production technical fields, and in particular to a kind of sodium bicarbonate production method.
Background technique
Using ammonium hydrogen carbonate, sodium chloride and brine as raw material, the life of sodium bicarbonate and ammonium chloride is produced by metathesis reaction
Production. art mainly has two kinds of modes:
1, using brine as sodium chloride resource raw material.Using brine natural resources, former halogen is made into a purified treatment, is sent into anti-
It answers in kettle, addition solid ammonium bicarbonate carries out metathesis reaction, through rinsing, dehydration, drying, packet after the sodium bicarbonate crystallization of generation
It dresses up as product.Mother liquor after metathesis reaction is concentrated through triple effect evaporator, crystallizes after ammonium chloride reaches some concentration, completes
Ammonium chloride separation.
The maximum defect of this technique is at two aspects, one is separating ammonium chloride energy consumption is very high, if without cogeneration of heat and power
Facility and local environmental protection administration allows to use bituminous coal as fuel, the just not no feasibility of practical application.The second is because multiple
Mother liquor contains Sodium bicarbonate product and cannot recycle in decomposition reaction, and yield is restricted.
2, it is produced using solid sodium chloride and solid ammonium bicarbonate as feedstock circulation.Mother liquor after completing metathesis reaction
It is sent into the cooling of ammonium chloride crystals kettle, when mother liquor Acclimation temperature, solid sodium chloride is put into, because chloride leach degree is to temperature
Different and common-ion effect, ammonium chloride are crystallized precipitation separation.Mother liquor after separating ammonium chloride, the original as metathesis reaction
Material, into next round circulation production process.
The defect of this technique: first is that cooling energy consumption is high, second is that the incrustation blocking of production link pipeline is serious and may be production
It stagnates, third is that due to ammonium chloride content height in the mother liquor after separating ammonium chloride, to prevent formation ammonium chloride in metathesis reaction same
When solve, it is necessary to the input quantity of ammonium hydrogen carbonate is greatly reduced, influences to produce intensity and specific yield.
Summary of the invention
The purpose of the present invention is to provide a kind of sodium bicarbonate production methods, to solve mentioned above in the background art ask
Topic.Under the premise of meeting current environmental protection policy requirement, according to ensure product quality, reduce energy consumption, expand specific yield,
The objective for reducing production cost, implements the technology of the present invention by following technical scheme.
To achieve the above object, the invention provides the following technical scheme:
A kind of sodium bicarbonate production method mainly includes following technique:
(1) metathesis reaction process: sodium chloride solution or brine are sent into the container with stirring, adjusted to appropriate temperature
Degree puts into ammonium hydrogen carbonate solid by appropriate speed, forms following metathesis reaction under the premise of opening stirring:
NaCl+NH4HCO3=NaHCO3↓+NH4Cl
It completes in metathesis reaction, due to the low characteristic of sodium bicarbonate solubility, after reactant reaches a certain concentration, carbonic acid
Hydrogen sodium, that is, crystalline deposit, the sodium bicarbonate after precipitating is rinsed, be dehydrated, dried, is packed, and becomes sodium bicarbonate finished product；
(2) ammonium chloride separation and benefit salt process:
1) using ammonium hydrogen carbonate and brine as in the technique of raw material, the mother liquor after the completion of metathesis reaction is sent into evaporator
Heating is concentrated by evaporation, and condensing crystallizing goes out the products such as ammonium chloride, sodium chloride and sold or used by oneself respectively, steam condensate (SC) or outer
Row is personal；
2) using ammonium hydrogen carbonate and solid sodium chloride as in the technique of raw material, the mother liquor after the completion of metathesis reaction is cooled down,
When mother liquor temperature reaches certain standard value, solid sodium chloride is put into, it will by cooling solubility effect and common-ion effect separation
Ammonium chloride crystals in mother liquor become magma；
3) ammonium chloride magma is dehydrated using centrifuge, packed as wet basis chlorination ammonium product；After separating ammonium chloride
Mother liquor be sent into reaction kettle carry out next one circulation production.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, energy saving.Since not need to carry out mother liquor heating evaporation dense for the technical solution of separating ammonium chloride of the present invention
Sheepshank is brilliant, does not also carry out decrease temperature crystalline to mother liquor, but uses the electrodialysis plant group high-efficient, low energy consumption, compared to existing
Process technology scheme, energy consumption reduce 20%-35%；
2, due to not having heating, cooling, the natural content state of sodium bicarbonate will not change in mother liquor, cause sodium bicarbonate
Yield promotes 10%-15%；
3, because not cooling down to mother liquor, the incrustation of production pipeline system is reduced, and production stability is much improved.Because no
It heats up to mother liquor, the mother liquor containing a large amount of ammonium chlorides is greatly reduced equipment corrosion；
4, present invention process route is closed circulating operation production, in addition to product, does not discharge dirt externally, meets environment
Protect fundamental policy；
5, according to experimental data, using technical solution of the present invention, production cost reduces 15%-25%.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
Fig. 2 is the work flow diagram of electrodialysis plant group.
Specific embodiment
Combined with specific embodiments below, technical scheme in the embodiment of the invention is clearly and completely described, shows
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
A kind of sodium bicarbonate production method combined with Figure 1 and Figure 2, specifically includes the following steps:
1) tap water is used, by 250g/l standard configuration sodium chloride solution, is sent into reaction kettle, adjustment temperature to 30-37
Degree；
2) according to the ratio standard of ammonium hydrogen carbonate and sodium chloride mass ratio 1.35:1, at the uniform velocity solid ammonium bicarbonate is put into
Metathesis reaction is carried out in reaction kettle, opens stirring during feeding intake；
3) ammonium hydrogen carbonate, which feeds intake, finishes, and sodium bicarbonate magma, mother liquor is put into rinsing bath rinsing, by centrifuge after rinsing
Dehydration, then drying machine are dry, as sodium bicarbonate finished product；
4) mother liquor after separation sodium bicarbonate is sent into crystalline ammonium kettle, starts electrodialysis plant group, that is, ED, to separation of carbon
Mother liquor after sour hydrogen sodium carries out circulation concentration；
5) ED-1 grades, ED-2 grades, ED-3 grades of dope all returns and recycles concentration, cycles of concentration 1.5- in crystalline ammonium kettles
2.5 times, the cycles of concentration refers to: mother liquor volume/concentration post mother liquor volume before the concentration of crystalline ammonium kettle；
6) when cycles of concentration reaches above-mentioned steps 5) standard when, put into solid sodium chloride, using its concentration saturated crystallization and
Common-ion effect crystallizes two effects, and ammonium chloride is come out by crystalline deposit and forms ammonium chloride magma；
7) ammonium chloride magma is dehydrated by centrifuge, packaging becomes wet basis chlorination ammonium product；
8) solution after centrifuge separation, which is sent into, mends salt tank；
9) clear liquid that electrodialysis plant group is isolated in addition to there are sodium bicarbonate rinse water is used as on a small quantity, mend by most of be sent into
Salt tank mends salt；
10) mother liquor sent from centrifuge, electrodialysis plant group is sufficiently mixed by stirring in benefit salt tank, measures chlorine
Change sodium content, then carry out supplement solid sodium chloride by the standard that final sodium chloride content is 200g/l-280g/l, is sufficiently stirred molten
Solution, clarification；
11) by the mother liquor after clarification, be sent into reaction kettle, as the raw material of the second wheel production sodium bicarbonate, and successively week and
What is renewed carries out circulation production.
Electrodialysis plant group refers under applying direct current electric field effect in the step 4), using amberplex to solution
The selective penetrated property of intermediate ion makes anions and canons in solution that Ion transfer occur, is reached respectively by anions and canons exchange membrane
The isolated equipment of solvent into solution.
The DC voltage of the three-stage electrodialysis device such as ED-1 grades, ED-2 grades, ED-3 grades is according into originally in the step 5)
Grade Chlorine in Solution ammonium content is different, controls between 10V to 100V.
Enter ammonium chloride content Con trolling index in the light liquid for mending salt tank in the step 9) after the processing of electrodialysis plant group:
0.14 grams per liter~80 grams per liters.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (3)
1. a kind of sodium bicarbonate production method, it is characterised in that: specifically includes the following steps:
1) tap water is used, by 250g/l standard configuration sodium chloride solution, is sent into reaction kettle, adjustment temperature to 30-37 degree；
2) according to the ratio standard of ammonium hydrogen carbonate and sodium chloride mass ratio 1.35:1, at the uniform velocity solid ammonium bicarbonate is put into and is reacted
Metathesis reaction is carried out in kettle, opens stirring during feeding intake；
3) ammonium hydrogen carbonate, which feeds intake, finishes, and sodium bicarbonate magma, mother liquor are put into rinsing bath rinsing, de- by centrifuge after rinsing
Water, then drying machine are dry, as sodium bicarbonate finished product；
4) mother liquor after separation sodium bicarbonate is sent into crystalline ammonium kettle, starts electrodialysis plant group, that is, ED, to separation bicarbonate
Mother liquor after sodium carries out circulation concentration；
5) ED-1 grades, ED-2 grades, ED-3 grades of dope all returns and recycles concentration, cycles of concentration 1.5-2.5 in crystalline ammonium kettles
Times, the cycles of concentration refers to: mother liquor volume/concentration post mother liquor volume before the concentration of crystalline ammonium kettle；
6) when cycles of concentration reaches above-mentioned steps 5) standard when, put into solid sodium chloride, using its concentration saturated crystallization and with from
Sub- effect crystallizes two effects, and ammonium chloride is come out by crystalline deposit and forms ammonium chloride magma；
7) ammonium chloride magma is dehydrated by centrifuge, packaging becomes wet basis chlorination ammonium product；
8) solution after centrifuge separation, which is sent into, mends salt tank；
9) for the clear liquid that electrodialysis plant group is isolated in addition to there are sodium bicarbonate rinse water is used as on a small quantity, most of be sent into mends salt tank
Mend salt；
10) mother liquor sent from centrifuge, electrodialysis plant group is sufficiently mixed by stirring in benefit salt tank, measures sodium chloride
Content, then by final sodium chloride content be 200g/l-280g/l standard carry out supplement solid sodium chloride, be sufficiently stirred dissolution,
Clarification；
11) by the mother liquor after clarification, it is sent into reaction kettle, as the raw material of the second wheel production sodium bicarbonate, and successively in cycles
Carry out circulation production.
2. a kind of sodium bicarbonate production method according to claim 1, it is characterised in that: ED-1 grades in the step 5),
The DC voltage of the three-stage electrodialysis device such as ED-2 grades, ED-3 grades is different according to the same level Chlorine in Solution ammonium content is entered, control
Between 10V to 100V.
3. a kind of sodium bicarbonate production method according to claim 1, it is characterised in that: through electrodialysis in the step 9)
Enter ammonium chloride content Con trolling index in the light liquid for mending salt tank: 0.14 grams per liter~80 grams per liters after the processing of device group.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112591771A (en) * | 2020-12-17 | 2021-04-02 | 钟广新 | Circular production process of sodium bicarbonate and ammonium chloride |
| CN112919502A (en) * | 2020-09-30 | 2021-06-08 | 湖南海联三一小苏打有限公司 | Process method for producing food-grade baking soda by double decomposition |
| CN115872417A (en) * | 2023-03-08 | 2023-03-31 | 北京赛科康仑环保科技有限公司 | Bipolar membrane reinforced sodium chloride alkali preparation method |
| CN117446830A (en) * | 2023-12-25 | 2024-01-26 | 中国科学院过程工程研究所 | Method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt |
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| CN1046143A (en) * | 1989-04-06 | 1990-10-17 | 四川大学 | The production method of industrial sodium bicarbonate and agricultural ammonium chloride |
| CN105236450A (en) * | 2015-08-28 | 2016-01-13 | 袁东海 | Total-circulation clean production process of baking soda through double decomposition reaction |
| CN108147587A (en) * | 2018-02-05 | 2018-06-12 | 华电水务工程有限公司 | A kind of method and system of desulfurization wastewater zero-emission |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046143A (en) * | 1989-04-06 | 1990-10-17 | 四川大学 | The production method of industrial sodium bicarbonate and agricultural ammonium chloride |
| CN105236450A (en) * | 2015-08-28 | 2016-01-13 | 袁东海 | Total-circulation clean production process of baking soda through double decomposition reaction |
| CN108147587A (en) * | 2018-02-05 | 2018-06-12 | 华电水务工程有限公司 | A kind of method and system of desulfurization wastewater zero-emission |
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| 李广洲等: "《学科教学详解 初中化学》", 31 July 2015 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112919502A (en) * | 2020-09-30 | 2021-06-08 | 湖南海联三一小苏打有限公司 | Process method for producing food-grade baking soda by double decomposition |
| CN112591771A (en) * | 2020-12-17 | 2021-04-02 | 钟广新 | Circular production process of sodium bicarbonate and ammonium chloride |
| CN115872417A (en) * | 2023-03-08 | 2023-03-31 | 北京赛科康仑环保科技有限公司 | Bipolar membrane reinforced sodium chloride alkali preparation method |
| CN117446830A (en) * | 2023-12-25 | 2024-01-26 | 中国科学院过程工程研究所 | Method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt |
| CN117446830B (en) * | 2023-12-25 | 2024-03-01 | 中国科学院过程工程研究所 | Method for preparing high-purity sodium carbonate and ammonium chloride by using sodium chloride waste salt |
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Application publication date: 20191008 |