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Crude Naphthalene



Crude Naphthalene
Product Description

We have the required domain expertise and technology to manufacture and supply Crude Naphthalene. These products are widely used for making processed naphthalene that is further used for purification and storage of clothes. Owing to their pungent and distinct smell, these products are very toxic in nature. These products are also used for making standard solutions of volatile organic compounds for different applications related to water & soil analysis. Crude Naphthalene is available with us in different quantities as per the requirements of the clients.

Other details:

 

No.

Properties

Method

Unit

Value


1


Crystallization Point

IS : 539-1974

C

78.7

2

Purity


GC

%

98.1

3

Thionaphthene


0.48

4

Methyl Naphthalene


0.27


Uses

As a chemical intermediate

Naphthalene is mainly used as a precursor to other chemicals. The single largest use of naphthalene is the industrial production of phthalic anhydride, although more phthalic anhydride is made from o-xylene. Other naphthalene-derived chemicals include alkyl naphthalene sulfonatesurfactants, and the insecticide 1-naphthyl-N-methylcarbamate (carbaryl). Naphthalenes substituted with combinations of strongly electron-donating functional groups, such as amines, and strongly electron-withdrawing groups, especially sulfonic acids, are intermediates in the preparation of many synthetic dyes. The hydrogenated naphthalenes tetra hydronaphthalene (tetralin) anddecahydronaphthalene (decalin) are used as low-volatility solvents. Naphthalene is also used in the synthesis of 2-naphthol, a precursor for various dyestuffs, pigments, rubber processing chemicals and other miscellaneous chemicals and pharmaceuticals.[4]

Naphthalene sulfonic acids are used in the manufacture of naphthalene sulfonate polymer plasticizers (dispersants) which are used to produce concrete and plasterboard (wallboard or drywall). They are also used as dispersants in synthetic and natural rubbers, and as tanning agents (syntans) in leather industries, agricultural formulations (dispersants for pesticides), dyes and as a dispersant in Lead-acid battery plates.

Naphthalene sulfonate polymers are produced by reacting naphthalene with sulfuric acid and then polymerizing with formaldehyde, followed by neutralization with sodium hydroxide or calcium hydroxide. These products are commercially sold in solution (water) or dry powder form.

  • Sulfonation Step (Sulfuric Acid plus Naphthalene):

H2SO4 + C10H8 = C10H7-SO3H + H2O

  • Polymerization Step (Naphthalene Sulfonic Acid plus Formaldehyde):

C10H7-SO3H + CH2-O = C10H7-SO3H-(C10H7-SO3H)n + H2SO4

  • Neutralization Step (Naphthalene Sulfonic Acid Condensate plus Sodium Hydroxide):

C10H7-SO3H-(C10H7-SO3H)n + NaOH = C10H7-SO3Na-(C10H7-SO3Na)n + H2O + Na2SO4

[edit]Wetting Agent/Surfactant

Alkyl naphthalene sulfonates (ANS) are used in many industrial applications as nondetergent wetting agents that effectively disperse colloidal systems in aqueous media. The major commercial applications are in the agricultural chemical industry, which uses ANS for wettable powder and wettable granular (dry-flow able) formulations, and the textile and fabric industry, which utilizes the wetting and defoaming properties of ANS for bleaching and dyeing operations.

[edit]As a fumigant

Naphthalene's most familiar use is as a household fumigant, such as in mothballs although 1,4-dichlorobenzene (or p-dichlorobenzene) is now more widely used. In a sealed container containing naphthalene pellets, naphthalene vapors build up to levels toxic to both the adult and larval forms of many moths that attack textiles. Other fumigant uses of naphthalene include use in soil as a fumigant pesticide, in atticspaces to repel animals and insects, and in museum storage-drawers and cupboards to protect the contents from attack by insect pests.


Product Code : 24


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