What to do with sub-sodium that fails the start-up and shutdown tests?
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This post was last edited by sunjl1981 on 2013-1-7 00:06. Please share your suggestions – how should we deal with the substandard sodium hypochlorite that is produced during starting up and shutting down? And after being left for a long time, it turned into saltwater? Is there any good way to turn substandard sodium hypochlorite into qualified sodium hypochlorite that can be sold? # + + .
Use the residual chlorine from wastewater discharge to absorb sodium hypochlorite to meet the required standards, and then purchase it
It seems that the company in question does not produce sodium hypochlorite specifically; instead, it can reuse the chlorine waste from wastewater, reprocess it to make it suitable for use, and then sell it. Or add some chlorine to produce sodium hypochlorite with a high effective chlorine content, and sell the mixture after they neutralize each other.
Reply to 3# yidi2004: Hypochlorite is our by-product; we only produce it when there is demand for it. Normally, we do not manufacture hypochlorite. The hypochlorite produced during startup and shutdown processes is of poor quality, and its concentration drops after a couple of days, turning it into brine that cannot be sold. It seems a bit of a waste ； There was also a case where the alkali content of sodium hypochlorite was 1%, but sodium hypochlorite tends to decompose. What level of alkali content is required to stabilize hyposodium?
Sodium hypochlorite is our by-product; we only produce it when there is demand for it. Normally, we do not manufacture sodium hypochlorite, except during periods of operation or shutdown... Published by Tuya on 2010-6-22 10:41. According to GB 19106－2003 standards, the content of free alkali in sodium hypochlorite solutions should be between (0.1～1.1)%; however, our factory usually keeps this level around (0.5～1.1)% to prevent easier decomposition.
We generally keep the excess alkali level below 2%; if it is below 2%, we carry out tank dumping； There was a period of time when efforts were made to keep it below 1% as well, and subsequent adjustments were made as appropriate. Currently, consideration is being given to whether to install a dedicated facility for producing sodium hypochlorite, with the aim of converting sodium hypochlorite with a high alkalinity level into qualified sodium hypochlorite by reacting it with chlorine gas. Another aspect is reducing the risk of using accident devices to produce sodium hypochlorite. For the sale of sodium hypochlorite, some products with an alkalinity level of 2%, or even around 4%, are sold directly. It mainly depends on the requirements of the customer service and one’s own production costs.
Is it more costly to keep the excess alkali level at 2% or 4%? Will it also affect how customers use it? Our customers generally require products to be manufactured in accordance with national standards.
Reply to 7# yidi2004: What other factors affect the stability of hypoclorite besides its alkali content? Here we also produce hyposodium in accordance with national standards, but it becomes substandard after just two days.
Reply to 6# 181128425: Haha, here the accident treatment unit and the sodium hypochlorite production unit are part of the same system; therefore, sodium hypochlorite is produced only when someone orders it. I don’t do it usually. Only those with unqualified sodium levels in the start and stop cycles cannot be processed. How exactly is chlorine introduced? Create another set of systems?
Reply 8# tuya: Temperature, light intensity, the metal ions present in sodium hypochlorite, and the amount of impurities can all affect the stability of sodium hypochlorite.
With an effective chlorine level of over 10 and an alkali content of around 0.5, as long as the temperature of the solution is kept below 35, there’s generally no problem leaving it for 3 to 5 days