Sunday, June 1, 2008
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Chemical Engineering share a new FAYF in May 2008. This FAYF is related to some tips and requirements of Acid Solution Storage especially in Material of Construction (MOC).
The acid solution discussed in this FAYF includes :
Sulfuric acid (H2SO4)
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References
1. Grossel, S., Safe Efficient Handling of Acids, Chem. Eng. December 1998, pp. 104–112.
2. Anon., Phosphoric Acid, Rhone-Poulene Basic Chemicals Co., Shelton, Conn. (1992).
RELATED POST
- Sulfuric acid (H2SO4)
- Phosphoric acid (H3PO4)
- Hydrochloric acid (HCl)
- Nitric acid (HNO3)
- Hydrofluoric acid (HF)
Sulfuric acid (H2SO4)
- Reaction in H2SO4 potentially generate hydrogen (H2), ensure proper venting and dispersion
- Carbon steel (CS) good for concentrated H2SO4 at normal ambient temperature.
- Diluted H2SO4 is severely corrodes CS. Shall keep away moisture from CS tank e.g. Nitrogen blanketting
- Polyvinyl chloride (PVC) pipe may be used
- Rolled upward 3 m from tank bottom to allows free weld expansion and contraction (reduced stress)
- Avoid corner weld which normally undue stresses occur (corrosion)
- Heating required to avoid freezing in storage.
- Use SS316 or rubber lined CS or Fiberglass Reinforced plastic. Avoid CS.
- HCl (fume) vent send to scrubber or flare for proper disposal
- Use Rubber lined CS or Glass lined CS or FRP.
- Similar to HCl, Nitrogen Oxides (NOx) vent to scrubber
- Upto 95 wt% @ ambient, use SS 304L
- More than 95 wt%, use Aluminium Alloy
- Anhydrous HF has high vapor pressure. Tank should design for 60 psig (as minimum)
- All welds shall be X-rayed and Stress-Relieved.
- HF fume shall be vented to scrubber or flare
- May use CS upto 66 degC and 70wt% HF
- Potential Hydrogen Blistering (Read more how H2 blistering form ?). Periodic tank inspection for blistering.
Note :
*Login required. Registration FREE.
** Download immediately as article available FREE within short period.
*** Found lost link or unable to download, may contact me...
References
1. Grossel, S., Safe Efficient Handling of Acids, Chem. Eng. December 1998, pp. 104–112.
2. Anon., Phosphoric Acid, Rhone-Poulene Basic Chemicals Co., Shelton, Conn. (1992).
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- Hydrogen Embrittlement TEST method
- Hydrogen present and it's impact to metallurgy
- Different Equation for Pitting Resistance Equivalent Number (PREN)
- Chlorride stress corrosion cracking and use of correct MOC for seawater
- Pitting Corrosion - Mechanism & Prevention
Labels: Material
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