Potassium Hydroxide, Liquid

Potassium Hydroxide is a strong alkali which is produced as a clear liquid solution. It is sold in either 45% or 50% solution and shipped via barge, tank car (rail) or tank truck. The end uses for potassium hydroxide as a percent of the total domestic potassium hydroxide market by volume are shown in the following table:

Caustic Potash, Liquid
(Potassium Hydroxide, KOH)
45% KOH Standard Liquid Grade

Parameters
Specifications
Reference Methods
Total Alkalinity as Weight % KOH
45.0 to 46.0
ASTM: E -291.90
Weight % K2CO3
0.2 Max.
AOAC: 920.194
Weight % NaOH
0.43 Max.
SMEWW: 3500-Na:C
Weight % Na
0.25 Max.
SMEWW: 3500-Na:C
PPM KCl
50 Max.
SMEWW: 4500-Cl-:F
PPM KClO3
10 Max.
SMEWW: 4110
PPM K2SO4
30 Max.
SMEWW: 4500-SO42-:B
PPM Fe
2 Max.
SMEWW: 3500-Fe:C
PPM Pb
0.90 ppm
SMEWW: 3500=Pb:C
PPM Heavy Metals (as Pb)
10 Max.
SMEWW: 3120
PPM Hg
.045 Max.
SMEWW: 3500-Hg:B
CAS Registry Number: 1310-58-3

Note: This product meets the requirements for the following standards: Food Chemicals Codex, The National Formulary (The United States Pharmacopoeia), ANSI/NSF 60, Kashruth endorsed Orthodox Parve Kosher at Ashtabula, Ohio, (meets the requirements necessary to receive the Kosher certification at other plants)
Date of last Revision: Jan 01, 2010


Caustic Potash, Liquid
(Potassium Hydroxide, KOH)
50% KOH Standard Liquid Grade

Parameters
Specifications
Reference Methods
Total Alkalinity as Weight % KOH
50.0 to 51.0
ASTM: E -291.90
Weight % K2CO3
0.2 Max.
AOAC: 920.194
Weight % NaOH
0.43 Max.
SMEWW: 3500-Na:C
Weight % Na
0.25 Max.
SMEWW: 3-Na:C
PPM KCl
50 Max.
SMEWW: 4500-Cl-:F
PPM KClO3
10 Max.
SMEWW: 4110
PPM K2SO4
30 Max.
SMEWW: 4500-SO42-:B
PPM Fe
2 Max.
SMEWW: 3500-Fe:C
PPM Pb
1.0 Max.
SMEWW: 3500-Pb:C
PPM Heavy Metals (as Pb)
10 Max.
SMEWW: 3120
PPM Hg
.050 Max.
SMEWW: 3500-Hg:B
CAS Registry Number: 1310-58-3

Note: This product meets the requirements for the following standards: Food Chemicals Codex, The National Formulary (The United States Pharmacopoeia), ANSI/NSF 60, Kashruth endorsed Orthodox Parve Kosher at Ashtabula, Ohio, (meets the requirements necessary to receive the Kosher certification at other plants)
Date of last Revision: Jan 1, 2010


Freeze-Point Depression of
50% Liquid Caustic Soda

50% Liquid Caustic Soda begins to crystallize at 54oF and becomes umpumpable below 48oF. Often, it is not practical or economically feasible to provide the heating necessary to prevent this product from freezing during storage and handling. For many applications, however, 50% Liquid Caustic Soda is the concentration of choice.

As a solution to the potential freezing problem, blend 45% Liquid Caustic Potash with 50% Liquid Caustic Soda. The following table lists recommended blends with their respective lower temperature points at which they can still be pumped. The table also shows the percent reduction in active alkalinity of the blend that can be expected due to the presence of the 45% Liquid Caustic Potash.

RESULTING BLEND
45% Caustic Potash, Wt.%
50% Caustic Soda, Wt.%
Pumpable Temp., oF
Reduction in Active
Alkalinity, %
0
100
48
0
5
95
30
1.8
10
90
15
3.6
20
80
10
7.2
25
75
5
9.0
30
70
-5
10.8
35
65
-10
12.6
40
60
-13
14.4