LNG cold energy seawater desalination and concentrated saltwater comprehensive utilization technology

A concentrated brine and cold energy technology, which can be used in chilled water/sewage treatment, seawater treatment, alkali metal compounds, etc., can solve problems such as poor economy and adaptability, and achieve increased product added value, low production cost and energy consumption, and high technological Reasonable effect of process and cold energy utilization

Inactive Publication Date: 2016-08-03
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

[0003] In view of the above problems, the object of the present invention is to provide a comprehensive utilization process of LNG cold energy for seawater desalination and concentrated brine, wh

Method used

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  • LNG cold energy seawater desalination and concentrated saltwater comprehensive utilization technology

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: take 1000m 3 Seawater (NaCl29.30g / l, KCl0.72g / l, NaBr0.14g / l, MgSO 4 2.15g / l, CaSO 4 1.53g / l, MgCl 2 3.28g / l) as raw material, use LNG cold energy freezing (-30℃) to desalinate seawater to produce fresh water and 117.2m 3 Concentrated brine (NaCl249.99g / l, KCl6.15g / l, NaBr1.19g / l, MgSO 4 18.35g / l, CaSO 4 0.61g / l, MgCl 2 27.99g / l); the 117.2m 3 Bromine (Br 2 ) and 117.2m 3 Debrominated brine (NaCl249.99g / l, KCl6.15g / l, NaBr0.01-0.02g / l, MgSO 4 18.35g / l, CaSO 4 0.61g / l, MgCl 2 27.99g / l); to 117.2m 3 Add caustic soda and soda ash to debrominated concentrated brine to produce 2.85 tons of magnesium hydroxide, 0.052 tons of calcium carbonate and 117.2m 3 Refined halogen (NaCl249.99g / l, KCl6.15g / l, NaBr0.01-0.02g / l, NaCl 2 SO 4 21.71g / l, Ca 2+ 0.030g / l, Mg 2+ 0.020g / l); Use LNG cold energy to freeze (-24°C) 117.2m 3 Refined brine produced 5.32 tons of sodium sulfate decahydrate and 114.2m 3 Desulfurization mother liquor (NaCl256.56g / l, KCl6.31g...

Embodiment 2

[0033] Embodiment 2: take 1000m 3 Seawater (NaCl29.30g / l, KCl0.72g / l, NaBr0.14g / l, MgSO 4 2.15g / l, CaSO 4 1.53g / l, MgCl 2 3.28g / l) as raw material, use LNG cold energy freezing (-20 ℃) ​​to desalinate seawater to produce fresh water and 117.2m 3 Concentrated brine (NaCl249.99g / l, KCl6.15g / l, NaBr1.19g / l, MgSO 4 18.35g / l, CaSO 4 0.61g / l, MgCl 2 27.99g / l); the 117.2m 3 Bromine (Br 2 ) and 117.2m 3 Debrominated brine (NaCl249.99g / l, KCl6.15g / l, NaBr0.01-0.02g / l, MgSO 4 18.35g / l, CaSO 4 0.61g / l, MgCl 2 27.99g / l); to 117.2m 3 Add caustic soda and soda ash to debrominated concentrated brine to produce 2.85 tons of magnesium hydroxide, 0.052 tons of calcium carbonate and 117.2m 3 Refined halogen (NaCl249.99g / l, KCl6.15g / l, NaBr0.01-0.02g / l, NaCl 2 SO 4 21.71g / l, Ca 2+ 0.030g / l, Mg 2+ 0.020g / l); Use LNG cold energy to freeze (-21.5°C) 117.2m 3 Refined brine produced 5.32 tons of sodium sulfate decahydrate and 114.2m 3 Desulfurization mother liquor (NaCl256.56g / l, KCl...

Embodiment 3

[0034] Embodiment 3: take 1000m 3 Seawater (NaCl29.30g / l, KCl0.72g / l, NaBr0.14g / l, MgSO 4 2.15g / l, CaSO 4 1.53g / l, MgCl 2 3.28g / l) as raw material, using LNG cold energy freezing (-5 ℃) for seawater desalination to produce fresh water and 117.2m 3 Concentrated brine (NaCl249.99g / l, KCl6.15g / l, NaBr1.19g / l, MgSO 4 18.35g / l, CaSO 4 0.61g / l, MgCl 2 27.99g / l); the 117.2m 3 Bromine (Br 2 ) and 117.2m 3 Debrominated brine (NaCl249.99g / l, KCl6.15g / l, NaBr0.01-0.02g / l, MgSO 4 18.35g / l, CaSO 4 0.61g / l, MgCl 2 27.99g / l); to 117.2m 3 Add caustic soda and soda ash to debrominated concentrated brine to produce 2.85 tons of magnesium hydroxide, 0.052 tons of calcium carbonate and 117.2m 3 Refined halogen (NaCl249.99g / l, KCl6.15g / l, NaBr0.01-0.02g / l, NaCl 2 SO 4 21.71g / l, Ca 2+ 0.030g / l, Mg 2+ 0.020g / l); Use LNG cold energy to freeze (-21.5°C) 117.2m 3 Refined brine produced 5.32 tons of sodium sulfate decahydrate and 114.2m 3 Desulfurization mother liquor (NaCl256.56g / l, K...

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Abstract

The invention provides an LNG cold energy seawater desalination and concentrated saltwater comprehensive utilization technology. The technology comprises the following steps: taking seawater/industrial wastewater, which contains sodium chloride, magnesium sulfate, calcium sulfate, potassium chloride, sodium bromide, and magnesium chloride, as the raw material, carrying out a desalination treatment to obtain fresh water and concentrated saltwater; preparing bromine and de-brominated concentrated saltwater from concentrated saltwater through an air blowing method; adding caustic soda and sodium carbonate into de-brominated concentrated saltwater to produce magnesium hydroxide, calcium carbonate, and refined bittern; freezing refined bittern by LNG cold energy to produce sodium sulfate decahydrate and desulfurized mother liquor at a freezing temperature of -4 to -30 DEG C; subjecting the desulfurized mother liquor to high temperature evaporation at a temperature of 90 to 150 DEG C to produce sodium chloride and salt making mother liquor, delivering the sodium chloride to offshore caisson for creating marine reclamation land, subjecting the salt making mother liquor to low temperature evaporation at a temperature of 20 to 60 DEG C so as to produce potassium chloride and potassium salt mother liquor, and returning the potassium salt mother liquor to the refined bittern. The procedure and cold energy are reasonably utilized, the additional value of product is increased, the production cost and energy consumption are low, and the technology can be used to desalinate seawater in a large scale.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, in particular to an LNG cold energy seawater desalination and concentrated brine comprehensive utilization process. Background technique [0002] Seawater utilization has become an important strategic measure for many coastal countries to solve the problem of fresh water shortage and promote sustainable economic and social development. At present, the main fields of seawater utilization in my country are: first, the direct utilization of seawater, that is, using seawater as raw water to directly replace fresh water as industrial water and domestic water; second, seawater desalination, that is, the use of seawater desalination to produce fresh water; Utilization means extracting chemical elements, chemicals and deep processing from seawater. The known seawater containing salt, magnesium sulfate, calcium sulfate, potassium chloride, bromine, magnesium chloride and other componen...

Claims

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Application Information

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IPC IPC(8): C01B7/09C01D3/06C01D5/00C01F5/14C01F11/18C02F1/22C02F103/08
CPCC01B7/096C01D3/06C01D5/00C01F5/14C01F11/18C02F1/22C02F2103/08Y02A20/124
Inventor 彭赛军朱晓峰冯逸仙
Owner CHINA LIGHT IND INT ENG CO LTD
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