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Lithium Naphthalene CAS 91-20-3

Molecular Formula: C10H8

Formula Weight: 128.17

ZSpharmac: Lithium Naphthalene  Supplement

Product Name: Lithium Naphthalene
CAS No: 91-20-3
Purity: 99%

Basic Info

Product Name:Lithium Naphthalene
Other Names:Naphthalene, 99%
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Organic Chemical Raw Materials
Appearance:Colorless Monoclinic Crystal
EINECS No.:202-049-5
Storage:Store Below +30°C.
Provide:Lithium Naphthalene MSDS;
Lithium Naphthalene COA

What is Lithium Naphthalene ?

Lithium Naphthalene is the simplest condensed aromatic hydrocarbon composed of two benzene rings, commonly known as “sanitary ball”. Naphthalene occurs in industry in the form of crude naphthalene (industrial and pressed naphthalene) and refined naphthalene. The melting point is 80.28°C, the solid density is 1.145g/cm3, the liquid density (85°C) is 0.9752g/cm3, the specific heat capacity (100°C) is 1809J/(kg·K), and the refractive index (85°C) is 1.5898. Naphthalene is a colorless monoclinic crystal, volatile, sublimating, has a special odor, is flammable, and can form explosive mixtures with air; its petroleum ether solution is red-purple fluorescent under a mercury lamp, almost insoluble in water, soluble in ether, Alcohol, benzene and other solvents. Naphthalene vapor and dust can be poisoned when inhaled into the human body or absorbed through the skin, and the maximum allowable concentration in the air is 20mg/m3. Naphthalene is one of the basic raw materials for industries such as dyes, plastics, paints, medicines and pesticides. Naphthalene is more prone to substitution reactions than benzene—halogenation, nitration, sulfonation and Friedel-Crafts reactions. The electron density on the α-carbon atom is higher, and the rate of generating the α-substituted product is faster; the β-substituted product is more stable. The ratio of α- and β-substituted products in the substitution reaction depends on factors such as the nature of the reagents, catalysts, solvents, and temperature. For example, the halogenation and nitration reactions are irreversible, and generally produce mainly α-substituted products, in which the bromination reaction can occur without a catalyst.

The sulfonation reaction is reversible. When the temperature is low, the main product is α-naphthalene sulfonic acid. When the temperature is high, the main product is β-naphthalene sulfonic acid. When the temperature is increased, α-naphthalene sulfonic acid can be converted into more Stabilized beta-naphthalenesulfonic acid:


The sulfonation reaction is reversible. When the temperature is low, the main product is α-naphthalene sulfonic acid. When the temperature is high, the main product is β-naphthalene sulfonic acid. When the temperature is increased, α-naphthalene sulfonic acid can be converted into more Stabilized beta-naphthalenesulfonic acid:

萘 磺化反应

Lithium Naphthalene Properties:

Melting point 80-82 °C (lit.)
Boiling point 218 °C (lit.)
density 0.99
vapor density 4.4 (vs air)
vapor pressure 0.03 mm Hg ( 25 °C)
refractive index 1.5821
Fp 174 °F
storage temp. Store below +30°C.
solubility methanol: soluble50mg/mL, clear, colorless
form Faint beige to brown to salmon red powder
color White to almost white
Specific Gravity1.145
explosive limit0.9-5.9%(V)
Water Solubility 30 mg/L (25 ºC)


Lithium Naphthalene Uses

  1. Lithium Naphthalene is mainly used in the production of phthalic anhydride, and is also the basic raw material for the preparation of dyes, medicines, plastics, etc.It can be used in the production of color intermediates, diffusing agents, water decreasing representatives, and so on.
  2. Lithium Naphthalene is a raw material in the production of pesticides. It can be made into methyl naphthol and ethyl naphthol, and it can also be oxidized into phthalic anhydride to further generate phthalimide. It can also be combined with chloroacetic acid to generate naphthalene acetic acid. It can be used as intermediates of pesticides iminophos, carbaryl, herbicides bentazone, napropamide, plant growth regulators naphthalene acetic acid and naphthalene oxyacetic acid.
  3. Lithium Naphthalene is used as a solvent for insoluble dye crystallization in organic analysis.Figure out molecular weight. Colorimetric Requirement. Criterion for the resolution of carbon and hydrogen by natural microanalysis. Crystalline organic scintillator in liquid scintillation counting. Calibrate the thermometer. Organic Synthesis.

Lithium Naphthalene Production Method

The preparation method of Lithium Naphthalene is: in high temperature coal tar (naphthalene accounts for about 8% to 12%), after the tar is distilled to cut off the light oil fraction and the phenol oil fraction, the 210-230 ℃ fraction is cut to obtain the naphthalene oil fraction. The naphthalene oil fraction is cooled and crystallized to obtain crude naphthalene with a naphthalene content of 75%, and then the crude naphthalene is filtered, dried and pressed to obtain a pressed block with a naphthalene content of 96% to 98%, and the pressed naphthalene is melted. Add sulfuric acid to wash and purify, then use 10% sodium hydroxide to neutralize and remove phenol, then carry out distillation to remove water, collect 100-130°C fractions, and finally crystallize to obtain finished products. If it is made from petroleum hydrocarbons, its raw materials are derived from catalytic heavy reformate oil, catalytic cracking refined cycle oil, and by-product tar from cracking to produce ethylene.

Lithium Naphthalene - Crystallization Refinement

Using the principle of redistribution of components between liquid-solid two phases during cooling and crystallization of molten crude naphthalene, the process of purifying naphthalene through multiple melting and crystallization. It is one of the processes for refining crude naphthalene obtained by processing naphthalene oil fractions. Impurities in crude naphthalene generally lower the melting point of naphthalene, so when the liquid crude naphthalene is slowly cooled, naphthalene crystallizes first, while impurities accumulate in the liquid phase. If the precipitated naphthalene is melted and crystallized again, the crystal purity of the precipitated naphthalene is further improved. Strictly control the temperature and speed of the melting and crystallization process, and finally high-purity refined naphthalene products can be obtained. The naphthalene melt-crystallization purification can be performed continuously, semi-continuously or batchwise.The main impurity in industrial naphthalene is thiase, whose boiling point is only 2°C away from that of naphthalene, so it is difficult to remove by distillation, and their crystallization points differ by 48°C, so it is more appropriate to use melting-crystallization method to remove them. Separation and purification of naphthalene. Brief history of development: In 1952, W.G.Pfann first proposed the melting-crystallization refining technology (regional melting), which is mainly used for the purification of semiconductors and metal materials, and can also be used for the purification of organic compounds. The French Proabude company used this method to carry out the test of purifying naphthalene, and in 1962 realized the industrial production in the UK. Later, the Brody method of Australia Union Carbide Company and the Sulzer method of Switzerland appeared to purify naphthalene by melting-crystallization refining process. In 1985, China built the Brody method refined naphthalene plant, and then successively built some Proabd-type plants. Process flow: There are three methods: Brody method, Sulzer method and Proabude method.

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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