Industrial chemicals

Fiber bleaching

Immersion bleaching	Wince	Cloth circulates
	Kier	Fluid circulates
Steam bleaching	J/L box	Steam bleaching
	Round piler	Steam bleaching, boil bleaching
	HI-CELLENT steamer	Steam bleaching, boil bleaching
	Excel bleach	Steam bleaching

Reference usage amount

Amount of NaClO2 added: 6-12% (owf) in terms of Silbrite 25
pH: 3-4, adjust with acetic acid, formic acid, oxalic acid, etc. (Our product: Silst A)

Wood bleaching

Dipping method	Used for various veneers (ceilings, beams running between columns in traditional Japanese architecture, walls, floors, columns, furniture). Wood type: Cedar, red cedar, redwood, spruce, cypress, Oregon pine, Taiwan cypress, hemlock spruce, fir, Agathis, Ramin, Taiwan red cypress, etc.
Coating method	Only the surface is treated and application takes place using a brush or sponge. This means that operation is simple, but achieving uniformity is a little difficult. Example: Home scouring

Reference usage amount

NaClO2 solution at a concentration of 50-300 g/L

Cautionary notes

• Processing cannot be undertaken if wax or other substances are painted on the surface.
• It is not possible to processing for only the part you want to whiten. Please treat a wide area.
• If the paint dries out, rehydrate it to restart the reaction.
• After completion, the paint needs to be removed sufficiently. Wipe thoroughly with a wet rag, etc.

Nitrogen oxide (NOx) is a causative agent when it comes to photochemical smog and countermeasures are urgently needed.
Silbrite has excellent oxidizing power and can completely oxidize NO (which is difficult to absorb) into NO2 (which is easy to absorb), resulting in high removal efficiency.
Therefore, it is also effective when it comes to sources of generation of high-concentration NOx (metal processing, silicon wafer processing, etc.).

Main reaction of NOx gas removal

Oxidization	2NO+NaClO₂→2NO₂+NaCl
Absorption	2NO₂+Na₂SO₃+2NaOH→2NaNO₂+NaSO₄+H₂O

NaNO2 generated in the absorbent solution is decomposed and treated by reacting it with Na2SO3 (sodium sulfite).

Bleaching applications	Pericarps of butterbur, peaches, grapes, cherries and citrus fruits (limited to those used in the manufacture of confectionery)
Sterilization applications	Cut vegetables (raw vegetables), eggshells (sterilization for Salmonella and Escherichia coli), processed herring roe (excludes dried and frozen herring roe)

Must not be used for any other purpose or for food.

Silbrite has the best oxidizing power when it comes to oxidizing metallic copper. It is thus widely used as an oxidizing agent for copper-clad laminates. Depending on the processing conditions, customers can select either black processing (blackening) or brown processing.

Processing conditions

Processing time	2-10 min.
Treatment temperature	80-90℃

Treatment liquid composition and characteristics

*This table can be scrolled horizontally.

	Brown processing	Black processing
NaClO₂/NaOH (composition ratio)	15-20	4-8
NaOH concentration (g/L)	5-8	7-14
Film composition	CuO/Cu2O=1	CuO/Cu₂O=2-3
Copper oxide surface crystal shape	Spherical	Columnar
Halo prevention	◎	○

Sterilization of hot springs and swimming pools (sterilization of Legionella bacteria)

Example of hot spring processing: sodium chlorite (0.2 ppm) and activator (3.5 ppm)
Active agent: Trichloroisocyanuric acid
[Comparison with Sodium Hypochlorite]
*When treating water containing manganese with Sodium hypochlorite (by other companies' products), manganese oxide is formed, causing the treated water to turn brown.
*Using hypochlorite at concentrations effective for sterilization can result in a chlorine odor, which may lead to customer complaints.

Deodorization of malodorous components by sodium chlorite

Malodorous components: ammonia, trimethylamine, methyl mercaptan, hydrogen sulfide, methyl sulfide, acetaldehyde, styrene, and methyl disulfide (8 malodorous substances)
Sodium chlorite decomposes to generate chlorine dioxide (ClO2). Deodorization as a result of reaction with malodorous components.

Direct addition	Injection directly into the malodorous liquid
Spraying	Direct spraying of sources of foul odors
Spray	Spray into the atmosphere