Sulphites; other than of sodium

HS code 283220 covers sulphites, excluding those of sodium. Sulphites are a class of chemical compounds that play a vital role in various industries, including food preservation, water treatment, and pharmaceutical manufacturing. As an important commodity in the global chemical trade, sulphites contribute significantly to the broader economy by enabling the production of a wide range of consumer and industrial products.

Sulphites, other than those of sodium, are typically produced through the reaction of sulfur dioxide (SO2) with various metal hydroxides or carbonates. The specific production process can vary depending on the desired sulphite compound, but generally involves the controlled introduction of SO2 gas into a reaction vessel containing the appropriate metal source. The resulting sulphite compound is then purified and prepared for distribution and use.

The main inputs required for the production of sulphites, other than sodium sulphite, include sulfur dioxide (SO2), various metal sources (such as calcium, magnesium, or potassium), and energy for the chemical reaction and purification processes. Specialized equipment, such as reaction vessels, gas handling systems, and purification equipment, are also essential inputs for this industry.

The primary outputs of HS code 283220 are sulphite compounds, such as calcium sulphite, magnesium sulphite, and potassium sulphite. These sulphites find widespread use in industries like 200300 Food Preservation, 281119 Water Treatment, and 300 Pharmaceuticals, where they serve as preservatives, antioxidants, and chemical intermediates. The sulphites produced under this code may also be used as inputs for the production of other chemical compounds, such as 283210 Sulphites of sodium.