CN1043683A - A kind of method with preparing caustic soda from sea water - Google Patents
A kind of method with preparing caustic soda from sea water Download PDFInfo
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- CN1043683A CN1043683A CN 88109729 CN88109729A CN1043683A CN 1043683 A CN1043683 A CN 1043683A CN 88109729 CN88109729 CN 88109729 CN 88109729 A CN88109729 A CN 88109729A CN 1043683 A CN1043683 A CN 1043683A
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- caustic soda
- seawater
- soda
- reaction
- metathesis
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- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
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Abstract
A kind of method of utilizing seawater to prepare caustic soda mainly is the seawater that utilizes at the incoming tide, is concentrated into degree Beaume naturally more than 22 ° through daylight.Add lime and soda ash, make magnesium and calcium deposit and go out, adding bicarbonate of ammonia then carries out replacement(metathesis)reaction, makes soda ash, adds the calcium hydroxide causticization then and produces caustic soda.At present the preparation method of caustic soda adopts brine electrolysis more and utilizes urao directly to carry out causticizing reaction with calcium hydroxide and produce caustic soda, in this way or because raw material is nervous or because power consumption is excessive, facility investment is restricted too greatly.Utilize seawater to produce caustic soda, technology is simple, and facility investment is few, can be widely used in coastal medium-sized and small enterprises.
Description
The invention belongs to a kind of preparation method of caustic soda, particularly a kind of method of utilizing seawater to prepare caustic soda.
The preparation method of general caustic soda, the employing that the has water law that electrolyzes table salt, utilize higher-grade urao and the direct causticization of calcium hydroxide that have are produced caustic soda.Above method perhaps is restricted owing to power shortage and salt are nervous, perhaps because urao quality and technology do not pass a test is difficult to develop.
Purpose of the present invention is exactly to utilize the seawater resources of China's abundant, provide that a kind of facility investment is few, technology is simple, be fit to coastal medium-sized and small enterprises production prepare the method for caustic soda with seawater.
Task of the present invention is finished in the following way:
The present invention mainly is the seawater that utilizes at the incoming tide, is concentrated into degree Beaume naturally more than 22 ° through daylight, adds lime and soda ash, make magnesium and calcium deposit and go out, bittern after will making with extra care is then heated to 20-50 ℃, and the speed of changeing with per minute 40-80 stirs, and adding ammonium hydrogencarbonate, carried out replacement(metathesis)reaction 30-80 minute, and generated sodium bicarbonate and ammonium chloride mother liquor, then sodium bicarbonate dehydration back drying is produced yellow soda ash, after yellow soda ash dissolves, add the calcium hydroxide causticization and produce caustic soda.
Its concrete grammar is:
With water pump seawater is squeezed into the cool pond of shining, be concentrated to degree Beaume through daylight and close bittern to satisfying more than 22 °, the salt chimney is squeezed into settling tank, record the content of magnesium and calcium, add the lime and the soda ash (adding alkali after adding lime earlier) of equivalent then, make at the bottom of magnesium and the calcium deposit pond bittern after will making with extra care then, squeeze into the metathesis groove, heat to 20-50 ℃, optimum temps is 35-40 ℃, stirs with 40-80 rev/min of speed with stirrer, best stirring velocity is 60-70 rev/min, and add bicarbonate of ammonia simultaneously, and keep 35-40 ℃, making it to carry out the replacement(metathesis)reaction reaction times is more than 30 minutes,) Best Times 50-60 minute, its reaction equation is as follows:
With the sodium bicarbonate centrifuge dewatering that generates, the sodium bicarbonate after dewatering heated in converter produce soda ash.After separating sodium bicarbonate, mother liquor is put into another evaporation tank, uses the daylight spontaneous evaporation, makes ammonium chloride mother liquor reach satiety and closes, and the ammonium chloride spontaneous nucleation is with making nitrogen fertilizer in agriculture after the water extracter dehydration.
The soda ash of producing is added water-solubleization to degree Beaume 10-12 °, and heat to 90-95 ℃ of adding calcium hydroxide and stirring, carry out causticization and produce caustic soda, its reaction equation is as follows:
Embodiment:
100 kilograms (this water contains NaCl:26.43%, Na to take from right evaporation seawater
2SO
4: Na 0.3%,
2S
2O
4: 3%, contain Mg
++, Ca
++, SO
= 4Be 5-7%).Add lime earlier, and then add soda ash, make magnesium and calcium deposit.Bittern after will making with extra care is then heated to 40-41 ℃, add 14.3 kilograms of bicarbonate of ammonia, stirred 10 minutes with 70 rev/mins speed, slowly add 14.3 kilograms of bicarbonate of ammonia again, still stirred at the same rate 10 minutes, to add 14.3 kilograms of bicarbonate of ammonia more then, the speed of changeing with per minute 80 stirred 60 minutes, clarified then, separated and filter, and took off 45 kilograms of dried sodium bicarbonates, mother liquid obtained cooling in the time of will filtering gets 25 kilograms of ammonium chlorides after saltouing.
45 kilograms of sodium bicarbonates of gained are calcined make 27 kilograms of soda ash,, carry out causticizing reaction and make 63 kilograms of liquid caustic soda that contain caustic soda 30% and contain 20 kilograms of 95% solid caustic sodas 19 kilograms of soda ash adding calcium hydroxides.
Claims (4)
1, a kind of method of utilizing seawater to prepare caustic soda, it is that seawater is changed into sodium bicarbonate, make caustic soda through causticizing reaction, it is characterized in that being condensed into bittern with seawater, add and in the metathesis groove, directly add bicarbonate of ammonia after lime and soda ash are made refining bittern, heat to 20-50 ℃, and stir, make its reaction more than 30 minutes with 40-80 rev/min speed.
2, according to the preparation method of the described caustic soda of claim 1., it is characterized in that: the optimum temps of heating when refining bittern reacts with bicarbonate of ammonia in the metathesis groove is 35-40 ℃.
3, according to the preparation method of the described caustic soda of claim 1.2, the best mixing speed is 60-70 rev/min when it is characterized in that refining bittern react with bicarbonate of ammonia in the metathesis groove.
4,, it is characterized in that refining bittern is 50-60 minute with the Best Times of ammonium hydrogencarbonate reaction in the metathesis groove according to the preparation method of the described caustic soda of claim 1..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88109729 CN1043683A (en) | 1988-12-27 | 1988-12-27 | A kind of method with preparing caustic soda from sea water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88109729 CN1043683A (en) | 1988-12-27 | 1988-12-27 | A kind of method with preparing caustic soda from sea water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1043683A true CN1043683A (en) | 1990-07-11 |
Family
ID=4835448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88109729 Pending CN1043683A (en) | 1988-12-27 | 1988-12-27 | A kind of method with preparing caustic soda from sea water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1043683A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100383062C (en) * | 2005-09-09 | 2008-04-23 | 唐山三友化工股份有限公司 | Sodium carbonate salt water prerefining and antiscaling process and prerefining reacting trough |
-
1988
- 1988-12-27 CN CN 88109729 patent/CN1043683A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100383062C (en) * | 2005-09-09 | 2008-04-23 | 唐山三友化工股份有限公司 | Sodium carbonate salt water prerefining and antiscaling process and prerefining reacting trough |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |