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:
STANDARD： HG/T 2967-2000
|SUPER GRADE||FIRST GRADE||QUALIFIED|
|SODIUM SULFITE (Na2SO3)%||≥97.0||≥96.0||≥93.0|
|IMPURITIES IN WATER,%||≤0.02||≤0.03||≤0.05|
DIFFERENCE BETWEEN 96% AND 97% PURITY SODIUM SULFITE：
|DIFFERENCE||96% PURITY SODIUM SULFITE||97%PURITY SODIUM SULFITE||REMARKS|
|1.MAIN PURITY||MAIN PURITY ABOVE 96% ,BELOW 97%||MAIN PURITY ABOVE 97%，SOME TIMES 98%，OR ABOVE 98%.|
|2.IMPURITY||SOME IMPURITIES||VERY FEW IMPURITY, ALMOST INVISIBLE|
|3.COLOR||WHITE OR LIGHT GRAY||WHITE OR COLORLESS,TRANSPARENT||THE COLER IS WHITER , THE PURITY AND QUALITY IS HIGHER.|
|4.WHITENESS||75-80||80-90||HIGHER WHITENESS,HIGHER PURITY|
|5.CRYSTALLINITY||30% CRYSTAL OR NO CRYSTALL，POWDER||95%-100% CRYSTALL||HIGHER CRYSTALLINITY,HIGHER QUALITY.|
|6.APPLICATION||CAN ONLY BE USED FOR INDUSTRY USAGE, WASTE WATER TREATMENT, INDUSTRY ITEMS BLEACHING.||WITH FOOD ADDITIVE LICENSE, CAN BE USED FOR FOOD BLEACHING, PRESERVATION, AND PHARMACEUTICAL INTERMEDIATES.||ACCRODING TO THE REQUIREMENTS OF EACH INDUSTRY, VARIOUS INDICATORS OF SODIUM SULFITE, DIFFERENT USES ARE DISTINGUISHED .|
|7.PRICE||2018 PRICE : 2800-2900 RMB||2018 PRICE : 3000-3200 RMB|
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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