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Technology for co-production of sodium carbonate, sodium chloride and ammonium chloride through calcium type rock salt brine and flue gas of boiler

A boiler flue and sodium chloride technology, applied in the directions of ammonium halide, carbonate preparation, alkali metal chloride, etc., can solve the problems of waste of resources and environment, high power consumption, pollution, etc., and achieve lower production costs and market capacity. Large, emission reduction effect

Inactive Publication Date: 2014-06-25
CHINA LIGHT IND INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The known techniques for producing soda ash with sodium chloride as a raw material mainly include the ammonia-soda method and combined soda method, wherein the ammonia-soda method has a low utilization rate of raw material sodium chloride (the utilization rate of sodium is about 75%, and the utilization rate of chlorine 0%), soda-making waste liquid (contains a large amount of calcium chloride, sodium chloride) discharges a large amount from the system, wastes resources and forms new environmental pollution
However, there are problems such as cold analysis and salting-out ammonium chloride crystallization process of high power consumption, large circulation of ammonium analysis mother liquor, and ammonium chloride market capacity in the combined alkali process.
Therefore, the application of the above-mentioned processes in actual production has limitations.

Method used

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  • Technology for co-production of sodium carbonate, sodium chloride and ammonium chloride through calcium type rock salt brine and flue gas of boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: take 100m 3 (NaCl-H 2 O system) calcium type brine (NaCl300g / l) and ammonia (NH 3 ), carbon dioxide (CO 2 10-14%) as the raw material for metathesis reaction (reaction temperature 40°C) and separated to obtain 43.45 tons of solid sodium bicarbonate containing ammonium chloride 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 (NaCl71g / l, NH 4 Cl179g / l, a small amount of NH 4 HCO 3 and (NH 4 ) 2 CO 3 ); heavy alkali mother liquor is preheated at high temperature (temperature 100°C) to remove ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) containing ammonium chloride (NH 4 Cl179g / l, NaCl71g / l) deamination mother liquor 100m 3 ; deamination mother liquor high temperature (temperature 130 ℃) evaporation separation to obtain 30 tons of sodium chloride and salt mother liquor (NH 4 Cl436g / l, NaCl100g / l); salt-making moth...

Embodiment 2

[0023] Embodiment 2: take 100m 3 (NaCl-H 2 O system) calcium type brine (NaCl270g / l) and ammonia (NH 3 ), carbon dioxide (CO 2 10-14%) as raw material for metathesis reaction (reaction temperature 40°C) and then separated to obtain 39.11 tons of solid sodium bicarbonate containing ammonium chloride 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 (NaCl72g / l, NH 4 Cl180g / l, a small amount of NH 4 HCO 3 and (NH 4 ) 2 CO 3 ); heavy alkali mother liquor is preheated at high temperature (temperature 100°C) to remove ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) containing ammonium chloride (NH 4Cl180g / l, NaCl72g / l) deamination mother liquor 100m 3 ; deamination mother liquor high temperature (temperature 135 ℃) evaporation separation to obtain 30 tons of sodium chloride and salt mother liquor (NH 4 Cl440g / l, NaCl96g / l); salt-making mothe...

Embodiment 3

[0024] Embodiment 3: take 100m 3 (NaCl-H 2 O system) calcium type brine (NaCl330g / l) and ammonia (NH 3 ), carbon dioxide (CO 2 10-14%) as raw materials for metathesis reaction (reaction temperature 40°C) and then separated to obtain 47.80 tons of solid sodium bicarbonate containing ammonium chloride 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 (NaCl70g / l, NH 4 Cl180g / l, a small amount of NH 4 HCO 3 and (NH 4 ) 2 CO 3 ); heavy alkali mother liquor is preheated at high temperature (temperature 100°C) to remove ammonium bicarbonate (NH 4 HCO 3 ), ammonium carbonate ((NH 4 ) 2 CO 3 ) containing ammonium chloride (NH 4 Cl180g / l, NaCl70g / l) deamination mother liquor 100m 3 ; deamination mother liquor high temperature (temperature 130 ℃) evaporation separation to obtain 33 tons of sodium chloride and salt mother liquor (NH 4 Cl436g / l, NaCl100g / l); salt-making mo...

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Abstract

The invention provides a technology for co-production of sodium carbonate, sodium chloride and ammonium chloride through calcium type rock salt brine and flue gas of a boiler. The technology comprises steps of carrying out double decomposition reaction on the raw materials refined calcium type rock salt brine (containing sodium chloride), ammonia and carbon dioxide, and then separating so as to obtain solid sodium bicarbonate and sodium bicarbonate mother liquor; preheating and deaminizing the sodium bicarbonate mother liquor at high temperature, so as to obtain deaminized mother liquor; evaporating the deaminized mother liquor and circulating ammonium-making mother liquor at high temperature so as to separate to obtain solid sodium chloride and salt-making mother liquor; evaporating the salt-making mother liquor at low temperature so as to separate to obtain solid ammonium chloride and ammonium-making mother liquor; circularly evaporating the ammonium-making mother liquor so as to separate to obtain solid sodium chloride and salt-making mother liquor; calcining solid sodium bicarbonate so as to convert into solid sodium carbonate. According to the technology, the use ratio of sodium and chlorine of the raw material rock salt is 100%, energy consumption and production cost are greatly lowered, and the technology has advantages of no emission of 'three wastes' due to the closed cycle, reduction of the carbon emission, environmental friendliness, and large capacity of the market of the main products and by-products.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, and in particular relates to a process for coproducing sodium carbonate, sodium chloride and ammonium chloride with calcium-type rock salt brine and boiler flue gas. Background technique [0002] The known techniques for producing soda ash with sodium chloride as a raw material mainly include the ammonia-soda method and combined soda method, wherein the ammonia-soda method has a low utilization rate of raw material sodium chloride (the utilization rate of sodium is about 75%, and the utilization rate of chlorine 0%), soda-making waste liquid (contains a large amount of calcium chloride and sodium chloride) is discharged into the system in a large amount, wasting resources and forming new environmental pollution. However, there are problems such as cold analysis and salting-out ammonium chloride crystallization process of high power consumption, large circulation of ammonium analysis mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00C01D7/18C01D7/12C01D3/06C01C1/16
Inventor 彭赛军朱晓峰彭志成
Owner CHINA LIGHT IND INT ENG CO LTD
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