The difference between 96% and 97% anhydrous sodium sulfite

Author: KIM. Date: January 24, 2018

Since entering the chemical industry, many friends and customers come to ask me, what is the difference between 96 and 97 % of anhydrous sodium sulfite, only just one percent difference, why the price has so big differnce? At first, I didn't understand like normal people. I just told the customers that I would ask our colleagues in the technology and production department before I could reply. I am not not smart, there is no other way, on this professional question, now, slowly by slowly, I know a little anhydrous sodium sulfite difference , but did not calm down to sum up these contents and details. Today, I can finally make a good summary and share with you.

First of all, a simple science popularization, what is anhydrous sodium sulfite?

Anhydrous sodium sulfite also be called sodium sulfite, is an industrial chemical salt, sodium salt, belonging to the basic general chemical products, white crystalline powder, the appearance is similar to our edible salt, as follows:

Sodium sulfite is widely used, so there are many manufacturers in China and a great demand in the world.

For example, it can be used as a catalyst for the addition reaction of urea-formaldehyde resin synthesis. As a reductant, it can protect oxygen-sensitive materials. It is also used as antioxidant, antioxidant and neutralizer. Used as film developer, chemical industry as reducing agent and sulfonating agent, dechlorinating agent and bleaching agent in printing and dyeing industry, stabilizer of chemical fiber, of course, the most important food additive as preservative, bleaching agent and so on.

Many instructions about the use of sodium sulfite are simply copied from others'opinions on the internet, so you can see that the version is almost the same. This simple version really can not fully explain the wide use and important role of this basic industrial salt, so I specially summarized an article on the use of sodium sulfite for your reference. The links are as follows:

The contents of anhydrous sodium sulfite are as follows:

DIFFERENCE BETWEEN 96% AND 97% PURITY SODIUM SULFITE：

总而言之，无水亚硫酸钠的含量越低，杂质含量就越高，颜色就会越深，甚至低含量的亚纳还会有很难闻的味道，而高含量的亚纳是几乎没有味道的。相反无水亚硫酸钠的含量越高，杂质含量就越低，颜色就会越白甚至是无色透明。

如下图所示：

In short, the lower content of anhydrous sodium sulfite, the higher impurity , the darker color, the lower the content with bad smell, while high purity sodium sulfit almost no smell. On the contrary, the higher content of anhydrous sodium sulfite, the lower impurities, and the whiter or even colorless transparent.

Diffrent puirty sodium sulfite photos, from 70% -97% PURITY :

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