Sodium Bisulfite production - Chemical plant design & operations
Mar 3, 2010 · The pH of a sodium bisulfite solution obtained by dissolving 10 wt % sodium metabisulfite in water at 20°C is 4.9; at 30 wt %, the pH is 4.4. Manufacture. Aqueous sodium hydroxide, sodium bicarbonate, sodium carbonate, or sodium sulfite solution are treated with sulfur dioxide to produce sodium metabisulfite solution.
Commercial Sodium Hydroxide Solution Freezing Point
Mechanical. Feb 25, 2003. 208. NZ. My books indicate that a 25% solution of sodium hydroxide should have a freezing point of around -18 deg C. However a local reputable reagent supplier tells me that their 25% solution freezes on a cold (say 0 deg C) day.
Suitable Material for 50% Sodium Hydroxide 2 - Eng-Tips
Mar 29, 2005 · The level transmitter is used in a hot caustic service (150oC, 56% sodium hydroxide, -34 kPag), and recently we found the diaphragm had been chewed out. Looking at chemical compatibility charts, we found half the literature indicating Hastelloy C as a good to excellent material for 50% caustic. However, there isn’t much information for ...
viscosity of caustic soda solution at lower temperatures 3 - Eng-Tips
Oct 25, 2011 · From the Orica Chemicals "Caustic Soda Handbook" issued September 1998 in Australia, it was an 'Absolute viscosity of Caustic Soda Solutions' versus temperature (in degrees Celsius) graph. For a 20% solution, I obtained the following viscosities: at 10 deg C the Viscosity = approx 7 cP. at 0 deg C the Viscosity = approx 12-13 cP.
Hypochlorite scaling - Waste disposal & treatment - Eng-Tips
Apr 6, 2010 · 10. NOTE: Scaling has the potential to occur when hypochlorite is injected into a dilution stream, which is subsequently piped to the point(s) of application. The sodium hypochlorite solution is at a high pH, due to the use of caustic soda (sodium hydroxide, NaOH) in the manufacture of the sodium hypochlorite.
Hastelloy type for hydrochloride acid and sodium hydroxide
Jul 7, 2004 · According to Philip A Schweitzer the following Hastelloy grades are resistant to both sodium hydroxide as well as hydrochloric acid: (Temperature degree Fahrenheit). The tabled value indicates the resistance is "good". "Good" is defined as <20 mils/year. HCl Dilute 20% 35% 38% 50% Hastelloy B/B-2 180 220 200 140 80
Chemical Dosing Rate Calculation - Acid Water Neutralisation 1
Jul 27, 2016 · But if you started with something other than ultrapure water and ultrapure sodium hydroxide, you will need more information about what else is in the water to accurately estimate how much acid is required to get you from pH 9 down to 7-8.
Demineralised water - Effect on 304 Stainless Steel 5 - Eng-Tips
Oct 17, 2012 · The anion will remove the carbon dioxide. The pH of demineralized water is normally a pH of 10 since the efflluent is in the form of sodium hydroxide. Some power plants are successfully operating carbon steel boiler systems with demineralized water. The secret is the water must be oxygen free. 0.
caustic and amin service - Corrosion engineering | Eng-Tips
Apr 3, 2015 · Sep 28, 2006. 1,237. RS. "Caustic service" refers to Sodium Hydroxide (NaOH) or Potassium Hydroxide (KOH) solutions in water. "Amine service" refers to commercial amine solutions (primary, secondary, or tertiary amine - e.g. MEA/DEA/MDEA) in water, used in gas treating. Below are some quick links on Caustic and Amine service.
EPDM OR PU? WHICH IS BETTER? - Eng-Tips
Mar 16, 2018 · May 26, 2004. 9,847. US. Like cpro said, EPDM is resistant to water and just about anything that can be dissolved in water (from sodium hydroxide to hydrochloric acid). On the other hand, urethane is much better at being resistant to abrasion (sand and particulates) and tramp oils, both of which might be issues for your wastewater gate.