Product

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Main Product
Sodium Chloride
Segment
Chemicals
Main-Family
Inorganics
Sub-Family
Inorganic Chlorine Compounds
Physical State

Solid

Product
Spent NaCl Brine
Abbreviation
NaCl
Names
Spent Brine; Depleted Brine
Product #Tags
#chloralkali

Description

In the chlor-alkali process, depleted brine is a brine solution with a lower salt concentration than the saturated brine (approximately 25 wt-% NaCl) fed to the electrolytic cell:

  • Mercury cells are usually operated to maintain a 21–22 wt-% concentration of salt in the spent brine discharged from the cell.
  • In the diaphragm cell, saturated brine is decomposed to approximately 50 % of its original concentration in a passage through the cell, compared to a 16 % decomposition of salt per passage through mercury cells.
  • Brine depletion in membrane cells is two or three times greater than in mercury cells, which allows the brine system to be smaller, resulting in significantly lower recycling rates and less equipment needed compared to mercury cell plants of the same capacity[1].

The table below gives the density (kg/L) and the corresponding concentration (% weight) of sodium chloride (NaCl) in water at different temperatures in degrees centigrade (°C)[2].

Sodium Chloride in Water
  Temperature in degrees Centigrade (°C)
  0°C 10°C 25°C 40°C 60°C 80°C 100°C
Concentration
(% Weight)		 Density (kg/L)
1 1.00747 1.00707 1.00409 0.99908 0.9900 0.9785 0.9651
2 1.01509 1.01442 1.01112 1.00593 0.9967 0.9852 0.9719
4 1.03038 1.02920 1.02530 1.01977 1.0103 0.9988 0.9855
8 1.06121 1.05907 1.05412 1.04798 1.0381 1.0264 1.0134
12 1.09244 1.08946 1.08365 1.07699 1.0667 1.0549 1.0420
16 1.12419 1.12056 1.11401 1.10688 1.0962 1.0842 1.0713
20 1.15663 1.15254 1.14533 1.13774 1.1268 1.1146 1.1017
24 1.18999 1.18557 1.17776 1.16971 1.1584 1.1463 1.1331
26 1.20709 1.20254 1.19443 1.18614 1.1747 1.1626 1.1492

 

References

  1. Source: T. Brinkmann et al. Best Available Techniques (BAT) Reference Document for the Production of Chlor-alkali. Industrial Emissions Directive 2010/75/EU. EUR 26844. Luxembourg: Publications Office of the European Union; 2014. JRC91156.
  2. handymath.com, The Complete Sodium Chloride Density-Concentration Table Calculator.
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  Product Communicator
Title Date
  UserPic Depleted (Spent) NaCl Brine added 7/30/2024
Identifiers

No Identifiers defined

Chemical Data
Specific Gravity
1.10
Crude Data
API Gravity
-2.86
Country
Product Settings
Default
Status
A
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Transaction Name Date
Modified by UserPic   Kokel, Nicolas 7/30/2024 12:46 PM
Added by UserPic   Kokel, Nicolas 7/30/2024 12:41 PM