Question: What is the typical purity of industrial-grade methanol?
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Question: What is the typical purity of industrial-grade methanol? What is the purity level that can be achieved for methanol-containing wastewater after distillation?
Look for the standards for methanol on the forum and you’ll find out. Generally, major methanol manufacturers can achieve quality above grade one.
Indices: Excellent grade, First-grade, Qualified grade
Chromaticity (Platinum-Cobalt scale): ≤ 5, 5, 10
Density (at 20°C), g/cm³: 0.791–0.792, 0.791–0.793, 0.791–0.793
Temperature range (0°C, 101325 Pa), °C: 64.0–65.5
Boiling range (including 64.6±0.1°C), °C: ≤ 0.8, 1.0, 1.5
Potassium permanganate test, minutes: ≥ 50, 30, 20
Water solubility test: Passes test (1+3), Passes test (1+9), –
Moisture content, %: ≤ 0.01, 0.15, –
Acidity (as HCOOH), %: ≤ 0.001, 5, 0.0030, 0.0050; or Alkalinity (as NH3), %: ≤ 0.0002, 0.0008, 0.0015
Aldehyde compound content (as CH2O), %: ≤ 0.002, 0.005, 0.010
Evaporation residue content, %: ≤ 0.001, 0.003, 0.005
Sulfuric acid washing test/Hazen units (Platinum-Cobalt scale): 50, 50
Chromaticity (Platinum-Cobalt scale): ≤ 5, 5, 10
Density (at 20°C), g/cm³: 0.791–0.792, 0.791–0.793, 0.791–0.793
Temperature range (0°C, 101325 Pa), °C: 64.0–65.5
Boiling range (including 64.6±0.1°C), °C: ≤ 0.8, 1.0, 1.5
Potassium permanganate test, minutes: ≥ 50, 30, 20
Water solubility test: Passes test (1+3), Passes test (1+9), –
Moisture content, %: ≤ 0.01, 0.15, –
Acidity (as HCOOH), %: ≤ 0.001, 5, 0.0030, 0.0050; or Alkalinity (as NH3), %: ≤ 0.0002, 0.0008, 0.0015
Aldehyde compound content (as CH2O), %: ≤ 0.002, 0.005, 0.010
Evaporation residue content, %: ≤ 0.001, 0.003, 0.005
Sulfuric acid washing test/Hazen units (Platinum-Cobalt scale): 50, 50
Thank you, although I still don’t understand it – can the purity reach 99%?
There are national standards for methanol on the forum; go and look for them
The purity of methanol wastewater can reach over 99.95% after distillation!
The products of ordinary enterprises can achieve over 99%.