Sea salt water desalination and strong brine comprehensive utilization energy-saving process
A technology for desalination of salt water and concentrated brine, applied in general water supply conservation, chemical industry, seawater treatment, etc., can solve the problems of poor process economy and adaptability, and achieve high heat energy utilization rate, high product quality, low production cost and energy consumption Reduced effect
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Embodiment 1
[0037] Embodiment 1: take 900m 3 Seawater (NaCl 30g / l, KCl 0.72g / l, NaBr 0.14g / l, MgSO 4 2.15g / l, MgCl 2 3.28g / l) as raw material, using reverse osmosis to desalinate seawater to produce 600 tons of fresh water and 300m 3 Concentrated brine (NaCl90g / l, KCl 2.16g / l, NaBr 0.42g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l), the reverse osmosis temperature is 30°C; the 300m 3 Concentrated brine adopts air blowing method to produce 0.29 tons of bromine (Br 2 ) and 300m 3 Debrominated concentrated brine (NaCl 90g / l, KCl2.16g / l, NaBr 0.015g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l); the 300m 3 Debrominated concentrated brine (NaCl 90g / l, KCl 2.16g / l, NaBr0.015g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l) and 3.49m 3 Potassium mother liquor (NaCl250g / l, KCl 193g / l, MgSO 4 26.1g / l, MgCl 2 87.2g / l) after mixing 303.49m 3 The mixture was separated by nanofiltration to obtain 278.7m 3 Monovalent compound brine (NaCl 100g / l, KCl 4.7g / l, MgSO 4 0.3g / l, MgCl 2 1.0g / l) and 24.79m 3 Divalent c...
Embodiment 2
[0038] Embodiment 2: take 900m 3 Seawater (NaCl 30g / l, KCl 0.72g / l, NaBr 0.14g / l, MgSO 4 2.15g / l, MgCl 2 3.28g / l) as raw material, using thermal distillation for seawater desalination to produce 600 tons of fresh water and 300m 3 Concentrated brine (NaCl90g / l, KCl 2.16g / l, NaBr 0.42g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l), thermal distillation temperature 80°C; 300m 3 Concentrated brine adopts air blowing method to produce 0.29 tons of bromine (Br 2 ) and 300m 3 Debrominated concentrated brine (NaCl 90g / l, KCl2.16g / l, NaBr 0.015g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l); the 300m 3 Debrominated concentrated brine (NaCl 90g / l, KCl 2.16g / l, NaBr0.015g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l) and 3.49m 3 Potassium mother liquor (NaCl250g / l, KCl 193g / l, MgSO 4 26.1g / l, MgCl 2 87.2g / l) after mixing 303.49m 3 The mixture was separated by nanofiltration to obtain 278.7m 3 Monovalent compound brine (NaCl 100g / l, KCl 4.7g / l, MgSO 4 0.3g / l, MgCl 2 1.0g / l) and 24.79m 3 Divalent...
Embodiment 3
[0039] Embodiment 3: take 900m 3 Seawater (NaCl 30g / l, KCl 0.72g / l, NaBr 0.14g / l, MgSO 4 2.15g / l, MgCl 2 3.28g / l) as raw material, using electrodialysis for seawater desalination to produce 600 tons of fresh water and 300m 3 Concentrated brine (NaCl90g / l, KCl 2.16g / l, NaBr 0.42g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l), the electrodialysis temperature is 25°C; the 300m 3 Concentrated brine adopts air blowing method to produce 0.29 tons of bromine (Br 2 ) and 300m 3 Debrominated concentrated brine (NaCl 90g / l, KCl2.16g / l, NaBr 0.015g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l); the 300m 3 Debrominated concentrated brine (NaCl 90g / l, KCl 2.16g / l, NaBr0.015g / l, MgSO 4 6.45g / l, MgCl 2 9.84g / l) and 3.49m 3 Potassium mother liquor (NaCl250g / l, KCl 193g / l, MgSO 4 26.1g / l, MgCl 2 87.2g / l) after mixing 303.49m 3 The mixture was separated by nanofiltration to obtain 278.7m 3 Monovalent compound brine (NaCl 100g / l, KCl 4.7g / l, MgSO 4 0.3g / l, MgCl 2 1.0g / l) and 24.79m 3 Divalen...
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