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Introduction:
General Chemical Corporation offers sodium sulfite in a variety of Grades:
- Food Grade
- Photo Grade
- Technical Grade
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- Sulftech® Grade
- Sulftech® Catalyzed
- Sulftech® Catalyzed with Sodium Metabisulfite
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Product Description:
Sodium sulfite is an odorless, white, crystalline or powder product.
| Chemical Formula |
Na2SO3 |
| Molecular Weight |
126.04 |
| Bulk Density lb./ft3 |
90-100 |
| Appearance |
White Granular Crystals
Or Powder |
| PH, 1% Solution |
9.8 |
Chemical Properties:
Sodium sulfite is a moderately strong reducing agent yielding sodium sulfate upon oxidation.
Physical Properties:
Sodium sulfite is an odorless, white, crystalline or powder product. It is soluble in water up to a maximum of 28 grams per 100 grams of saturated solution at 33.4 °C (92.1°F). Sodium sulfite is soluble in alcohol, acetone, liquid chlorine and ammonia.
Sodium sulfite is stable in dry air, even at 100 °C, but in moist air it is rapidly oxidized. Upon heating, sodium sulfite decomposes into various products. At 600 °C (1112°F) the thermal decomposition products are sodium sulfate (Na2SO4) and sodium sulfide (Na2S). Above 900°C (1652°F) the decomposition products are sodium oxide (Na2O) and sulfur dioxide. Aqueous solutions of sodium sulfite are basic. A 1% solution has a pH of about 9.8. The specific gravity of pure sodium sulfite at 15.4 °C is 2.6334. The bulk density of General Chemical's various grades of sodium sulfite range from 1442 Kg/m3 (90 lbs/ft3) to 1602 Kg/m3 (100 lb/ft3).
Major Uses:
- Antioxidant and enzyme inhibitor for food
- Film preservative and stain preventative for photography
- Sulfite semichemical pulping of paper
- Antichlor after bleaching of paper and textiles
- Bleaching of wood and silk
- Boiler water treatment (oxygen removal)
- Oil well flooding (oxygen removal)
- Water dechlorination
- Waste water treatment
- Flue gas desulfurization
- Source of Na2O and S make-up for kraft pulping process
- Iron reduction where its color is objectionable in a product
- Leather tanning
- Oil well drilling needs (oxygen removal)
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All statements, information, and data given herein are believed to be
accurate and reliable but are presented without guaranty, warranty or
responsibility of any kind, express or implied. The user should not assume
that all safety measures are indicated or that other measures may not be
required. All suggestions made herein are intended for use by persona
having requisite knowledge and skill, and are to be used at their own risk.
General Chemical assumes no responsibility for this information, and
potential purchasers waive all claims they may have and agree to indemnify
and hold harmless General Chemical from any claims or damages they may later
allege relative to their reliance upon these suggestions.
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