CN1262478C - Recovering process for NH3 and CO2 from production of low salt low potassium heavy sodium carbonate - Google Patents

Recovering process for NH3 and CO2 from production of low salt low potassium heavy sodium carbonate Download PDF

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Publication number
CN1262478C
CN1262478C CNB031371612A CN03137161A CN1262478C CN 1262478 C CN1262478 C CN 1262478C CN B031371612 A CNB031371612 A CN B031371612A CN 03137161 A CN03137161 A CN 03137161A CN 1262478 C CN1262478 C CN 1262478C
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water vapor
vapor condensate
mother liquor
decomposed solution
low
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CN1458065A (en
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王修立
肖仲兰
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2

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  • Treating Waste Gases (AREA)

Abstract

The present invention provides a process for preparing low-salt low-potassium heavy sodium carbonate and recycling ammonium chloride by a vapor direct calcination washing hydration method. The present invention recycles decomposition liquid outwards discharged from a production technique and NH3 and CO2 in water vapor condensate liquid, the recycled NH3 and CO2 directly react with mother liquor II so as to generate NaHCO3, the water vapor condensate liquid is used as a boiler water supply after the NH3 and the CO2 are recycled and has no outward discharge to pollute environment. The present invention has the characteristics of simple recycling flow path, low investment, easy operation, good effect, etc., and is favorable to environment protection and can reduce raw material consumption.

Description

NH during low-salt low-potassium heavy sodium carbonate is produced 3And CO 2Recovery technology
One, technical field
The present invention relates to the recovery technology that a kind of Soda Ash Danse is produced, further, the invention particularly relates to steam and directly calcine the recovery technology that low-salt low-potassium heavy sodium carbonate and ammonium chloride are made in the washing hydration.
Two, technical background
At present both at home and abroad in the method for suitability for industrialized production Soda Ash Danse solid phase hydration process is arranged and liquid phase water is legal and steam directly to calcine washing water legal etc.Directly calcining the washing hydration at steam makes in the technology of low-salt low-potassium heavy sodium carbonate production, two kinds of liquid that discharge (hereinafter to be referred as two kinds of liquid of first, second) are arranged, first kind liquid is that steam is directly calcined the water vapor condensate that the water vapor in the furnace gas that washs the hydration discharge generates after cooling off, this liquid is called water vapor condensate, wherein contains a large amount of NH 3And CO 2Second kind liquid is the liquid that calcining washing water synthesizing chemical-reacting is discharged, and this liquid is called decomposed solution, wherein also contains a large amount of NH 3And CO 2, at present in actual production process two kinds of liquid effluents directly as discharging of waste liquid, thereby caused environmental pollution, simultaneously a large amount of useful matteies are wasted.A kind of technology of making low-salt low-potassium heavy sodium carbonate and ammonium chloride has been described among the Chinese patent ZL01107296.2, it is a raw material with wet sodium bicarbonate directly, wherein just describe above-mentioned two kinds of liquid are arranged, but technology is reclaimed in its discharging do not do any description, the inventor did not meet other relevant report that reclaims technology yet in addition.
Three, summary of the invention
The objective of the invention is the shortcoming that exists in prior art and the above-mentioned patent, provide a kind of steam directly to calcine the recovery technology that low-salt low-potassium heavy sodium carbonate and ammonium chloride are made in the washing hydration, it is to reclaim the decomposed solution that discharges in the production technique and the NH in the water vapor condensate 3And CO 2, and with the NH that reclaims 3And CO 2Direct and mother liquor II reaction generates NaHCO 3, water vapor condensate is reclaiming NH 3And CO 2The back does not efflux contaminate environment as the boiler water source.Reach and cut down the consumption of raw materials, prevent to pollute the purpose of preserving the ecological environment.
The object of the present invention is achieved like this:
The present invention adopts vacuum ejector to spray to absorb the CO in the water vapor condensation liquid in calcining washing hydration decomposed solution and the calciner gas 2And NH 3For calcining washing hydration decomposed solution, decomposed solution is pumped in the vaporizer, feed the calciner gas of discharging in the vaporizer chuck from the direct calcination reactor of steam, decomposed solution heating to vaporizer, pump up as absorption liquid and spray with vapour condensation liquid through vacuum ejector, make the little negative pressure that produces 0.01-0.1Mpa in the airtight vaporizer and 20-95 ℃ temperature, the H that decomposed solution is evaporated 2O gas and with its NH that carries secretly 3And CO 2Absorb with water vapor condensate, thus the CO in the recovery decomposed solution 2And NH 3For water vapor condensate in the calciner gas, mother liquor II in the carbonating tower is made absorption liquid, pump into vacuum ejector, spray through vacuum ejector, make and form under 0.001-0.1MPa negative pressure and the 20-95 ℃ of temperature condition CO in the water vapor condensate retort in the water vapor condensate retort 2, NH 3Be decomposed out and absorbed CO by mother liquor II 2, NH 3Water vapor condensate after being absorbed is recycled to boiler systems; Also can further reclaim the CO in the tail gas of carbonating tower space in addition 2And NH 3, it is with pump the mother liquor II in the carbonating tower to be extracted out to pressurize, and sprays through vacuum ejector, makes carbonating tower form little negative pressure, thereby with the CO in the tail gas of carbonating tower space 2, NH 3The mother liquor II that is carbonized in the tower absorbs; At last can be with the CO of above-mentioned recovery 2And NH 3Be used for preparing NaHCO 3
Concrete technical process is: (1) second kind liquid is the NH in the decomposed solution 3And CO 2Recovery.Decomposed solution is pumped into vaporizer (enamel evaporating pan or multiple-effect evaporator), feed the calciner gas of discharging in the vaporizer chuck from the direct calcination reactor of steam, decomposed solution heating to vaporizer, pump up as absorption liquid and spray with steam condensate through vacuum ejector, make and produce little negative pressure in the airtight vaporizer, the H that decomposed solution is evaporated 2O gas and with its NH that carries secretly 3And CO 2Absorb with water vapor condensate, realize that second kind liquid is the CO in the decomposed solution 2And NH 3Reclaim.
(2) first kind liquid is the CO of steam condensate 2And NH 3Reclaim.The calciner gas main component that steam is directly calcined washing hydration discharge is water vapor, CO 2And NH 3Gas.Furnace gas heats vaporizer, loses the furnace gas of heat, through watercooler cooling, separation, isolates a large amount of CO again 2Enter in the carbonating tower, isolate simultaneously and contain CO 2And NH 3Water vapor condensate, II makes absorption liquid with mother liquor, with pump mother liquor II pressurization is sprayed through vacuum ejector, makes the water vapor condensate retort form negative pressure, makes CO 2And NH 3Decomposition is come out, and II absorbs and carbonization by mother liquor, thereby finishes the CO in the steam condensate 2And NH 3Recovery.
(3) in addition for the tail gas CO in the carbonating tower 2And NH 3Recovery.Pump up through the vacuum ejector injection, with the CO in the space tail gas in the carbonating tower with the mother liquor II in the carbonating tower 2And NH 3Aspiration is received among the mother liquor II.
The direct calcination reactor of steam of the present invention system adopts " the direct calcination reactor of a kind of steam " of utility model patent: ZL01213889.4.Miscellaneous equipment of the present invention all is the common equipments during Soda Ash Danse is produced.
The present invention has steam is directly calcined CO in the chemical reaction process that the washing hydration makes low-salt low-potassium heavy sodium carbonate and ammonia chloride craft 2And NH 3The material recovering effect is good, and flow process is simple, easy to operate, the characteristics that help environment protection and cut down the consumption of raw materials.
Description of drawings
Provide accompanying drawing of the present invention below.
Fig. 1 is a process flow sheet of the present invention.
The present invention is described in further detail below in conjunction with embodiment, but protection scope of the present invention is not limited to present embodiment.
Embodiment
Embodiment 1: the interior 2.5 cubic metres of second kind liquid of enamel evaporator are the CO in the decomposed solution 2And NH 3Recovery.It is 2.2 meters enamel evaporator that decomposed solution is pumped into 1.9 meters height of a diameter, feeding pressure is 120-140 ℃ calciner gas for the 0.2-0.3MPa temperature in the vaporizer chuck, 2.5 cubic metres of decomposed solution in the vaporizer are heated to 40-90 ℃, pump up as absorption liquid with water vapor condensate, spray through vacuum ejector, make and produce negative pressure 0.03MPa in the airtight vaporizer, the water vapor that decomposed solution is evaporated and with the CO of its 15tt that carries secretly 2NH with 8tt 3, make the CO in 20 cubic metres the water vapor condensate storage tank 2Content has improved 2.25ttNH 3Content has improved 1tt.
Embodiment 2: first kind liquid is the CO of 10 cubic metres of 25tt of water vapor condensate 2NH with 16tt 3Recovery.The direct calcination reactor of steam discharge calciner gas 120-140 ℃ is to the jacketed evaporator heating, loses in the furnace gas of heat water vapor and becomes water of condensation and be cooled to 60-30 ℃ through watercooler again, isolates a large amount of CO 2, CO 2Enter and carry out carbonization in the carbonating tower, other isolates and accompanies CO 2And NH 3Water vapor condensate in 10 cubic metres of retorts,, spray through vacuum ejector and to make retort produce the 0.05MPa negative pressure the mother liquor II in carbonating tower pressurization with pump, absorb CO in the retort by mother liquor II 2And NH 3Gas makes the CO of 20tt among 30 cubic metres of mother liquor II 2, 42tt NH 38tt and 5tt have risen respectively.
CO in the embodiment 3:60 cubic meter carbonating tower tail gas 2And NH 3Recovery.Mother liquor II pumps up in the carbonating tower, sprays through vacuum ejector to make the carbonization cat head produce the 0.05-0.01MPa negative pressure, with the CO in the tail gas between the carbonization cat head sky 2And NH 3Absorb, make the 36.8ttCO among the mother liquor II of carbonating tower 2NH with 52.6tt 3Content has been carried 4tt and 3tt respectively again.

Claims (5)

1, a kind of CO that reclaims in the waste liquid of discharging in low-salt low-potassium heavy sodium carbonate and the Production of Ammonium Chloride process 2And NH 3Processing method, wherein said effluent discharge is water vapor condensate in calcining washing hydration decomposed solution and the calciner gas, it is characterized in that adopting vacuum ejector to spray the CO that absorbs in above-mentioned two kinds of waste liquids 2And NH 3
2, processing method according to claim 1, it is characterized in that for calcining washing hydration decomposed solution, decomposed solution is pumped in the vaporizer, feed the calciner gas of discharging in the vaporizer chuck from the direct calcination reactor of steam, to the heating of the decomposed solution of vaporizer, make absorption liquid with steam condensate, pump up and spray through vacuum ejector, make the little negative pressure that produces 0.01-0.1MPa in the airtight vaporizer and 20-95 ℃ temperature, the H that decomposed solution is evaporated 2O gas and with its NH that carries secretly 3And CO 2Absorb with water vapor condensate, thus the CO in the recovery decomposed solution 2And NH 3
3, processing method according to claim 1, it is characterized in that for water vapor condensate in the calciner gas, mother liquor II in the carbonating tower is made absorption liquid, pump into vacuum ejector, spray through vacuum ejector, make and form under 0.001-0.1MPa negative pressure and the 20-95 ℃ of temperature condition CO in the water vapor condensate retort in the water vapor condensate retort 2, NH 3Be decomposed out and absorbed CO by mother liquor II 2, NH 3Water vapor condensate after being absorbed is recycled to boiler systems.
4, processing method according to claim 1 is characterized in that further reclaiming the CO in the tail gas of carbonating tower space 2And NH 3, it is with pump the mother liquor II in the carbonating tower to be extracted out to pressurize, and sprays through vacuum ejector, makes carbonating tower form little negative pressure, thereby with the CO in the tail gas of carbonating tower space 2, NH 3The mother liquor II that is carbonized in the tower absorbs.
5,, it is characterized in that the CO that to reclaim according to the described processing method of one of claim 1-4 2And NH 3Be used for preparing raw material NaHCO 3
CNB031371612A 2003-06-06 2003-06-06 Recovering process for NH3 and CO2 from production of low salt low potassium heavy sodium carbonate Expired - Fee Related CN1262478C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB031371612A CN1262478C (en) 2003-06-06 2003-06-06 Recovering process for NH3 and CO2 from production of low salt low potassium heavy sodium carbonate

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Application Number Priority Date Filing Date Title
CNB031371612A CN1262478C (en) 2003-06-06 2003-06-06 Recovering process for NH3 and CO2 from production of low salt low potassium heavy sodium carbonate

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CN1262478C true CN1262478C (en) 2006-07-05

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109809437A (en) * 2017-11-20 2019-05-28 内蒙古博源控股集团有限公司 Novel energy-saving environment-friendly heavy soda ash production technology and system
TR201910474A2 (en) * 2019-07-12 2019-08-21 Yilmaden Holding Anonim Sirketi DEVELOPING A SYSTEM THAT PREVENTS LOSSES OF NH3 and CO2 GASES IN SODA ASH PRODUCTION WITH THE SOLVAY PROCESS

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