Product

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Main Product
Sodium Hydroxide
Segment
Chemicals
Main-Family
Inorganics
Sub-Family
Mineral Bases
Physical State

Solid

Product
Spent Caustic Soda
Product #Tags
#chloralkali

Description

Spent caustic is a waste industrial caustic solution that has become exhausted and is no longer useful (or spent). Spent caustics are made of sodium hydroxide or potassium hydroxide, water, and contaminants. The contaminants have consumed the majority of the Sodium (or Potassium) hydroxide and thus the caustic liquor is spent, for example, in one common application H2S (Gas) is scrubbed by the NaOH (aqueous) to form NaHS (aq) and H2O (l), thus consuming the caustic[1].

Spent caustic concentration is typically: 

  • Low concentration: 1-5% w/w
  • Medium concentration: 5-15% w/w
  • High concentration: 15-25% w/w

Density values and molarity of NaOH solutions at 20°C are presented in the following table[2]:

NaOH conc.
(weight-%)		 NaOH molarity
(mol/L)		 Density @ 20°C
(g/cm3)
1 0.252 1.007
5 1.295 1.036
10 2.688 1.075
15 4.185 1.116
20 5.810 1.162
25 6.976 1.210

 

References

  1. Wikipedia, Spent caustic.Brave Search Summarizer, 30th Jul 2024, Potassium Hydroxide Solution.
  2. Japan Soda Industry Association, 20th Nov 2006, Safe Handling of Caustic Soda.
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  Product Communicator
Title Date
  UserPic Spent caustic soda added 8/1/2024
Identifiers

No Identifiers defined

Chemical Data
Chemical Formula

NaOH

Specific Gravity
1.10
Crude Data
API Gravity
-2.86
Country
Product Settings
Default
Status
A
Content provided by
Transaction Name Date
Modified by UserPic   Kokel, Nicolas 8/1/2024 5:18 AM
Added by UserPic   Kokel, Nicolas 8/1/2024 4:40 AM