Commercial Sodium Hydroxide Solution Freezing Point
2004年4月7日 · The CRC Handbook of Chemistry and Physics gives the lowest F.P. of -16.8[sup]o[/sup]C for a 14% mass solution of NaOH. I don't have the data, however, I believe that beyond this point richer concentrations have higher F.P. Even sodium chloride with a minimum F.P. of ~ -21[sup]o[/sup]C at ~23% mass, raises its F.P. up to zero Celsius at 26.3 % mass.
Caustic Lines - Chemical plant design & operations | Eng-Tips
2006年3月31日 · While Caustic Soda (Sodium Hydroxide) doesn't burn or explode, I would consider it a hazardous substance - even within the confines of an oil refinery. I have made it my policy to route caustic solution pipes totally away from areas of potential human traffic. This solution will cause severe and dangerous burns.
Settled sediments in plate exchanger - Eng-Tips
2006年12月20日 · The manufacturer suggest the use of sodium hydroxide or sodium carbonate to control the biological growth, or nitric, citric or phosphoric acid to control the common sediments (metal oxides, corrosion products, silt, alumina).
Sodium Hypochlorite Residual Readings all over the board
2004年10月28日 · The calcium is highly diluted before injection vs. the sodium is 12% undiluted (1 l/hr injection rate). A Couple of notes on the construction; injection line from pump 1/2" about 100' long; reciever line pressure ~2psi. It appeared the sodium was offgassing in the line and resulting in gas bubbles being injected into the line.
Rate of corrosion of 316 stainless steel in the presence of sodium ...
2008年12月30日 · The exposure to sodium hypochlorite is via vapors that have evaporated from storage tanks and containment area puddles within an enclosed room within an existing building with very poorly maintained ventilation). Thank you. I am grateful for any responses!
Testing for calcium hypochlorite vs. sodium hypochlorite 3 - Eng …
2004年10月6日 · Dia dhuibh We currently use sodium hypochlorite to treat water and are considering switching to calcium hypochlorite. Currently we use a Hach DPD Free Chlorine reagent test to test for free chlorine levels. My supplier is unable to answer the question of whether this test will read for...
MERCURY REMOVAL SYS - Chemical process engineering - Eng-Tips
2004年4月15日 · Precipitation as HgS, using sodium sulfide or sodium hydrosulfide as source, can achieve 10-20 ppb. Coagulation with iron or alum can achieve 0.5-5 ppb. Polymer flocculant aids the co-precipitation. Electrochemical methods. Your stream is too dirty and too dilute for electrowinning methods.
17-7PH CH900 in mild H2S atmosphere - Corrosion engineering
2003年5月9日 · I've read NASA MSFC-SPEC-522B and it's replacement MSFC-STD-3029 but they only cover stress corrosion cracking in Sodium Chloride environments. I've read excerpts from MqGuire's book Stainless Steels for Design Engineers which lists 17-7PH in any condition as acceptable for petroleum industry applications. However, I have a copy of NACE MR0175 ...
Pitting of electroless nickel over 2024-T351 1 - Eng-Tips
2003年5月14日 · 2) The corrosion is aluminum hydroxide, possibly with some zinc from the zincate pretreatment. It may have begun forming as soon as the EN plated part was rinsed. EN plating is done at ~192 F, initial rinsing is at room T and a final rinse is in hot DI water (to avoid stains and aid drying), so the differential thermal expansions exacerbate any ...
How to fix / Smooth Multiple Surfaces, Faces or Edges
2010年11月19日 · From what I've read here it sounds like the easiest and most straight-forward solution to your problem is to purchase some additional features for NX and let the software do all, or most of, this work for you in the meshing process. It isn't even totally clear to me that you would actually have much of a problem if you left things as-is.