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Technology for combined production of sodium carbonate and ammonium chloride through sodium sulfate type brine thermal cycle method

A technology of ammonium chloride and thermal cycle, applied in the direction of ammonium halide, carbonate preparations, etc., can solve the problems of high raw material cost, waste of resources, large discharge system, etc., and achieve strong adaptability of raw materials, high quality of main products, The effect of low energy consumption

Inactive Publication Date: 2015-10-28
CHINA LIGHT IND INT ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The utilization rate of sodium chloride, the raw material of the ammonia-soda method, is low (the utilization rate of sodium is about 75%, and the utilization rate of chlorine is 0), and the amount of waste liquor from alkali making (containing a large amount of calcium chloride and sodium chloride) is discharged from the system, which is wasteful. Resources, form new environmental pollution, can not directly use Glauber's salt brine as raw material
The cold method combined with alkali method needs to use solid sodium chloride as raw material, the cost of raw material is high, the electricity consumption of crystallized ammonium chloride by cold analysis and salting out is high, and the circulation volume of ammonium analysis mother liquor is large; due to the formation of sodium sulfate decahydrate and Ammonium chloride mixed crystal, so Glauber's salt brine cannot be directly used as raw material
[0003] Therefore, the above-mentioned technique of producing soda ash with sodium chloride as a raw material has limitations in actual production.

Method used

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  • Technology for combined production of sodium carbonate and ammonium chloride through sodium sulfate type brine thermal cycle method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 100m 3 NaCl-Na 2 SO 4 -H 2 O system Glauber's salt brine (NaCl300g / L, Na 2 SO 4 10g / L) and ammonia (NH 3 ), carbon dioxide (CO 2 ) as raw material, and 50m 3 Ammonium making mother liquor (NaCl220g / L, NH 4 Cl210g / L) after metathesis carbonization reaction (reaction temperature 25 ℃), separate and obtain 43.4 tons of sodium bicarbonate (NaHCO 3 ) and 150m containing ammonium bicarbonate, ammonium chloride, sodium sulfate and sodium chloride 3 Soda making mother liquor (NaCl70g / L, NaCl 2 SO 4 6.7g / L, NH 4 Cl193.5g / L, NH 4 HCO 3 105 / L), 150m 3 Soda-making mother liquor is deaminated at high temperature (temperature 100°C) to obtain 150m 3 Deamination mother liquor (NaCl70g / L, Na 2 SO 4 6.7g / L, NH 4 Cl193.5g / L), 150m 3 Deamination mother liquor is added with nitric acid (Na 2 SO 4 6.7g / L) equivalent lime 0.52 tons (Ca(OH) 2 ) reaction to remove nitrate to obtain 0.96 tons of calcium sulfate (CaSO 4 ), ammonia (NH 3 ) and 150m 3 Denitrification ...

Embodiment 2

[0027] Take 100m 3 NaCl-Na 2 SO 4 -H 2 O system Glauber's salt brine (NaCl300g / L, Na 2 SO 4 20g / L) and ammonia (NH 3 ), carbon dioxide (CO 2 ) as raw material, and 60m 3 Ammonium making mother liquor (NaCl200g / L, NH 4 Cl270g / L) after metathesis carbonization reaction (reaction temperature 25 ℃), separate and obtain 43.4 tons of sodium bicarbonate (NaHCO 3 ) and 160m containing ammonium bicarbonate, ammonium chloride, sodium sulfate and sodium chloride 3 Soda making mother liquor (NaCl70g / L, NaCl 2 SO 412.5g / L, NH 4 Cl193.5g / L, NH 4 HCO 3 105 / L), 160m 3 Soda-making mother liquor is deaminated at high temperature (temperature 100°C) to obtain 160m 3 Deamination mother liquor (NaCl70g / L, Na 2 SO 4 12.5g / L, NH 4 Cl193.5g / L), 160m 3 Deamination mother liquor is added with nitric acid (Na 2 SO 4 12.5g / L) equivalent lime 1.04 tons (Ca(OH) 2 ) reaction to remove nitrate to obtain 1.92 tons of calcium sulfate (CaSO 4 ), ammonia (NH 3 ) and 160m 3 Denitrificatio...

Embodiment 3

[0029] Take 100m 3 NaCl-Na 2 SO 4 -H 2 O system Glauber's salt brine (NaCl300g / L, Na 2 SO 4 30g / L) and ammonia (NH 3 ), carbon dioxide (CO 2 ) as raw material, and 40m 3 Ammonium making mother liquor (NaCl240g / L, NH 4 Cl180g / L) after metathesis carbonization reaction (reaction temperature 25 ℃), separate and obtain 43.4 tons of sodium bicarbonate (NaHCO 3 ) and 140m containing ammonium bicarbonate, ammonium chloride, sodium sulfate and sodium chloride 3 Soda making mother liquor (NaCl70g / L, NaCl 2 SO 4 21.4g / L, NH 4 Cl193.5g / L, NH 4 HCO 3 105 / L), 140m 3 Soda-making mother liquor is deaminated at high temperature (temperature 100°C) to obtain 140m 3 Deamination mother liquor (NaCl70g / L, Na 2 SO 4 21.4g / LL, NH 4 Cl193.5g / L), 140m 3 Deamination mother liquor is added with nitric acid (Na 2 SO 4 21.4g / L) equivalent lime 1.56 tons (Ca(OH) 2 ) reaction to remove nitrate to obtain 2.88 tons of calcium sulfate (CaSO 4 ), ammonia (NH 3 ) and 140m 3 Denitrificat...

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Abstract

The invention discloses a technology for combined production of sodium carbonate and ammonium chloride through a sodium sulfate type brine thermal cycle method. The technology comprises the following steps: (1) carrying out a metathesis reaction on sodium sulfate type brine, ammonia and carbon dioxide as raw materials, separating to obtain sodium bicarbonate and an alkali production mother liquor containing ammonium chloride, sodium sulfate, sodium chloride, ammonium bicarbonate and ammonium carbonate, and calcining the obtained sodium bicarbonate to obtain a sodium carbonate product; (2) preheating the alkali production mother liquor to carry out high temperature removal of ammonium bicarbonate and ammonium carbonate in order to obtain a deaminized mother liquor containing ammonium chloride, sodium sulfate and sodium chloride; (3) adding lime with the amount equal to that of sodium sulfate to the deaminized mother liquor, and reacting to remove sodium sulfate in order to obtain calcium sulfate, ammonia and a denitrified mother liquor containing ammonium chloride and sodium chloride; and (4) evaporating the denitrified mother liquor, and separating to obtain ammonium chloride and an ammonium production mother liquor. The technology has the characteristics of high quality of main products, strong adaptability of the raw materials, low cost, low energy consumption, closed loop, and no discharge of three wastes.

Description

technical field [0001] The invention relates to a technique for co-producing soda ash and ammonium chloride by thermal circulation of mirabilite-type brine, belonging to the technical field of inorganic chemicals. Background technique [0002] The known techniques for producing soda ash from sodium chloride mainly include the ammonia-soda method and the cold-process combined-soda method. The utilization rate of sodium chloride, the raw material of the ammonia-soda method, is low (the utilization rate of sodium is about 75%, and the utilization rate of chlorine is 0), and the amount of waste liquor from alkali making (containing a large amount of calcium chloride and sodium chloride) is discharged from the system, which is wasteful. resources, forming new environmental pollution, cannot directly use Glauber's salt brine as raw material. The cold method combined with alkali method needs to use solid sodium chloride as raw material, the cost of raw material is high, the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/16C01C1/16
Inventor 彭赛军彭志成
Owner CHINA LIGHT IND INT ENG CO LTD
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