Process for producing mirabilite type bittern, sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride

A technology of sodium chloride and sodium sulfate, applied in the directions of ammonium halide, carbonate preparation, alkali metal chloride, etc., can solve the problems of high cost of raw materials, waste of resources, environmental pollution, etc., and achieve high quality of main and by-products and high production cost. Low, the effect of strong adaptability of raw materials

Active Publication Date: 2011-08-17
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Known take sodium chloride as raw material to produce soda ash process and mainly contain ammonia-soda method and cold method combined soda method, wherein, ammonia-soda method exists raw material sodium chloride utilization rate is low (the utilization rate of sodium is about 75%, the utilization rate of chlorine 0%), soda-making waste liquid (contains a large amount of calcium chloride, sodium chloride) discharge system amount is very big, wastes resources, forms new environmental poll

Method used

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  • Process for producing mirabilite type bittern, sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride
  • Process for producing mirabilite type bittern, sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take 100m 3 NaCl-Na 2 SO 4 -H 2 O system Glauber's salt brine (NaCl 300g / l, NaCl 2 SO 4 20g / l) and ammonia (NH 3 ), carbon dioxide (CO 2 ) as a raw material for metathesis reaction (reaction temperature 40°C) to separate and obtain 43.45 tons of solid sodium bicarbonate and containing ammonium chloride, sodium sulfate and sodium chloride and a small amount of ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) heavy alkali mother liquor 100m 3 (NaCl 71g / l, NaCl 2 SO4 20g / l, NH 4 Cl 179g / l, a small amount of NH 4 HCO 3 and (NH 4 ) 2 CO 3 ); heavy alkali mother liquor preheating high temperature (temperature 100 ℃) removes ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) to obtain ammonium chloride (NH 4 Cl 179g / l, Na 2 SO 4 20g / l, NaCl 71g / l) deamination mother liquor 100m 3 ; Deamination mother liquor and circulating nitrate mother liquor are separated by nanofiltration membrane to obtain a small ...

Embodiment 2

[0029] Take 100m 3 NaCl-Na 2 SO 4 -H 2 O system Glauber's salt brine (NaCl 270g / l, NaCl 2 SO 4 18g / l) and ammonia (NH 3 ), carbon dioxide (CO 2 ) as a raw material for metathesis reaction (reaction temperature 40°C) to separate and obtain 39.11 tons of solid sodium bicarbonate and containing ammonium chloride, sodium sulfate and sodium chloride and a small amount of ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) heavy alkali mother liquor 100m 3 (NaCl 72g / l, NaCl 2 SO 4 18g / l, NH 4 Cl 180g / l, a small amount of NH 4 HCO 3 and (NH 4 ) 2 CO 3 ); heavy alkali mother liquor preheating high temperature (temperature 100 ℃) removes ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) to obtain ammonium chloride (NH 4 Cl 180g / l, Na 2 SO 4 18g / l, NaCl 72g / l) deamination mother liquor 100m 3 ; Deamination mother liquor and circulating nitrate mother liquor are separated by nanofiltration membrane to obtain a smal...

Embodiment 3

[0031] Take 100m 3 NaCl-Na 2 SO 4 -H 2 O system Glauber's salt brine (NaCl 330g / l, Na 2 SO 4 22g / l) and ammonia (NH 3 ), carbon dioxide (CO 2 ) as a raw material for metathesis reaction (reaction temperature 40°C) to separate and obtain 47.80 tons of solid sodium bicarbonate and contain ammonium chloride, sodium sulfate and sodium chloride and a small amount of ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) heavy alkali mother liquor 100m 3 (NaCl 70g / l, NaCl 2 SO 4 22g / l, NH 4 Cl 180g / l, a small amount of NH 4 HCO 3 and (NH 4 ) 2 CO 3 ); heavy alkali mother liquor preheating high temperature (temperature 100 ℃) removes ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) to obtain ammonium chloride (NH 4 Cl 180g / l, Na 2 SO 4 22g / l, NaCl 70g / l) deamination mother liquor 100m 3 ; Deamination mother liquor and circulating nitrate mother liquor are separated by nanofiltration membrane to obtain a small amo...

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Abstract

The invention provides a process for producing mirabilite type bittern, sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride. The process comprises the following steps of: performing double decomposition reaction by using mirabilite type bittern, ammonia and carbon dioxide as raw materials, and then separating the reaction products to obtain sodium bicarbonate and sodium bicarbonate mother solution; performing preheating and high-temperature ammonia removal on the sodium bicarbonate mother solution to obtain ammonia removed mother solution; separating the ammonia removed mother solution through a nano-filtration membrane to obtain denitration seeped clear solution and mirabilite rich concentrated solution; performing high-temperature evaporation and separation on the mirabilite rich concentrated solution to obtain solid sodium sulfate and mirabilite preparation mother solution, and circularly mixing the mirabilite preparation mother solution and the ammonia removed mother solution to perform the nano-filtration membrane separation process; performing high-temperature evaporation and separation on the denitration seeped clear solution and the circular ammonium preparation mother solution to obtain solid sodium chloride and salt preparation mother solution; performing low-temperature evaporation and separation on the salt preparation mother solution to obtain solid ammonium chloride and ammonium preparation mother solution; and mixing the ammonium preparation mother solution and the denitration seeped clear solution, and performing circular evaporation and separation to obtain solid sodium chloride and salt preparation mother solution. The process has the characteristics of high main product and byproduct quality, low steam energy consumption and production cost, no three-waste discharge in closed cycle and the like.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, and is a process for co-producing sodium carbonate, sodium chloride, sodium sulfate and ammonium chloride from mirabilite-type brine. The mirabilite-type brine refers to brine mainly containing sodium chloride and supplemented by sodium sulfate. Background technique [0002] Known take sodium chloride as raw material to produce soda ash process and mainly contain ammonia-soda method and cold method combined soda method, wherein, ammonia-soda method exists raw material sodium chloride utilization rate is low (the utilization rate of sodium is about 75%, the utilization rate of chlorine 0%), soda-making waste liquid (contains a large amount of calcium chloride, sodium chloride) discharge system amount is very big, wastes resources, forms new environmental pollution, can not directly adopt Glauber's salt type brine as raw material problem; There are problems that solid sodium chloride need...

Claims

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Application Information

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IPC IPC(8): C01D7/00C01D7/18C01D7/12C01D3/06C01D5/00C01C1/16
Inventor 彭赛军彭志成袁建军
Owner CHINA LIGHT IND INT ENG CO LTD
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