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Home > Encyclopedia > Sodium benzoate

Sodium benzoate

Sodium benzoate structure
  • CAS No:

    532-32-1

  • Formula:

    C7H5NaO2

  • Synonyms:

    Butyryl Chloride; Benzoic Acid, Sodium Salt; Sodium, Benzoate; Benzoic Acid, Sodium Salt; Benzoic Acid Sodium Salt; Sodium Benzoate

  • China Export:

    From 2018.11 to 2019.11, total export volume of Sodium benzoate from China was 1,349,159KG while total export value was $5,577,508. The biggest proportion of exporting volume in the last 12 months was 13.37% in 2019.03.

  • Categories:

    API  >  Synthetic Anti-infective Drugs

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Description

White crystals or granules, or colorless powder, with sweet astringency. Soluble in water, ethanol, glycerol and methanol.

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Basic Attributes

  • 532-32-1

  • C7H5NaO2

  • 144.10300

  • 144.01900

  • 40.13000

  • log Kow = -2.27 (est)

  • 208-534-8

  • WXMKPNITSTVMEF-UHFFFAOYSA-M

  • 2

  • 0

  • 1

Characteristics

  • White crystalline powder

  • 1,44 g/cm3

  • >300 °C(lit.)

  • 249.3ºC at 760 mmHg

  • 111.4ºC

  • Solubility in water, g/100ml at 20°C: 63

  • Low temperature, ventilation, drying

  • 2.9X10-12 mm Hg at 25 deg C (est)

  • Stable, but may be moisture senstive. Incompatible with strong oxidizing agents, alkalis, mineral acids.

Safety Information

  • 4002191900

  • NONH for all modes of transport

  • 1

  • R36/37/38

  • S24/25

  • DH6650000

  • Xi

  • P305 + P351 + P338

  • H319

  • LD50 orally in rats: 4.07 g/kg (Smyth, Carpenter)

Usage

1. Vasodilator
2. A benzene compound used as a synthetic reagent.

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Production Methods

1. By benzoic acid and sodium bicarbonate derived. Add water and sodium bicarbonate and pot, heated to boiling dissolved in sodium bicarbonate solution. The benzoic acid was added with stirring until the pH of the reaction solution was 7 to 7.5. Heating to make the exhaustion of carbon dioxide, plus activated carbon decolorization for half an hour. Filtration, the filtrate is concentrated and slowly placed in the liquid chip machine, the drum drying chip, crushed, too sodium benzoate. Consumption of fixed benzoic acid (99.5%) 1045kg / t, sodium bicarbonate (98%) 610kg / t. The benzoic acid was neutralized to pH 7.5 with a 32% solution of soda in a neutralization pot and the neutralization temperature was controlled at 70 ° C. Neutralization solution with 0.3% activated carbon decolorization vacuum suction filter, the filtrate is concentrated, dried powder powdered sodium benzoate products.
2. Toluene oxidation Benzoic acid by phthalic anhydride hydrolysis, decarboxylation; also by oxidation of toluene, hydrolysis obtained; also directly from the liquid phase oxidation in the system. Benzoic acid and then Na2CO3 and sodium salt. Toluene oxidation reaction is as follows: ① toluene oxidation 2200kg toluene, 2.2kg of cobalt naphthenate into the oxidation tower with the pump (aluminum, 700mm × 8000mm), through the jacket steam heated to 120 ℃, at this time toluene boiling. Then start 6.0m3 air compressor, compressed air from the bottom of the buffer tank into the toluene solution, the oxidation reaction occurs. The oxidation reaction is exothermic, so the reaction temperature is rising, but the maximum can not exceed 170 ℃. So half-way tower jacket not only to stop heating, but also to switch water cooling. Oxidation reaction, a large number of toluene vapor and water vapor from the top of the tower, into the 20m2 of the condenser tube, condensed into liquid and then into the water separator, toluene from the upper part of the manifold back to the oxidation tower, water from the lower part of the water separator, And then into the metering tank. The manifold is covered with a tail gas discharge pipe, and the tail gas enters the activated carbon absorption tower through a discharge pipe to a buffer tank to adsorb the toluene therein. Time to the tower directly through the steam, in order to desorb the adsorption of toluene, the latter by condensation, water, dry and then recycled. Toluene oxidation at 170 ℃ for about 12 ~ 16h, toluene conversion rate of 70% or more. ② The de-benzene oxidation liquid was put into the de-benzene kettle (1500L, with jacket). The jacketed steam was heated to 100 ~ 110 ℃ under vacuum of 0.08MPa, and the unreacted toluene was distilled out with compressed air. 10m2 of the condenser, the condensate into the water separator recycling. ③ benzene after distillation of benzene also contains impurities and organic pigments, need to be distilled. The liquid into the distillation kettle (enamel or stainless steel), heating and control of the liquid temperature of 190 ° C, benzoic acid will be steamed into the distillation tower (270mm × 6000mm, with seven trays), control the top temperature of 160 ° C, the distillate is cooled by the casing into the neutralization kettle, and purified benzoic acid is obtained. ④ neutralization of benzoic acid and into the kettle, the timely addition of pre-loaded with a good soda solution and neutralization (300L distilled water plus soda 140kg, can be neutralized benzoic acid 200kg or so). The neutralization temperature is preferably 70 ° C, and the neutralized material is terminated at pH 7.5. To remove noise, according to the neutralization of materials 3% by adding activated carbon decolorization, and then by vacuum filtration, that was colorless and transparent sodium benzoate solution (content of 50%). ⑤ drying Sodium benzoate solution by roller drying, or box-type spray-dried powder finished product.
3. Methyl benzoate and NaOH solution reaction Preparation of vacuum distillation of methyl benzoate obtained by adding four-neck flask, constant temperature water bath heating and control temperature, open the mixer, to set the reaction temperature with a separatory funnel Dropping a certain concentration of NaOH solution, methanol generated in time steamed, saponification reaction obtained sodium benzoate solution or paste. The pH of the reaction solution was measured to control the reaction end point, and the reaction was terminated at pH = 8. The obtained sodium benzoate was directly vacuum dried and pulverized to obtain sodium benzoate solid, and the quality index of sodium benzoate was analyzed. The effect of different NaOH concentration and different reaction temperature on the saponification reaction was investigated.

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China Sodium benzoate Export Data

Data referenced from General Administration of Customs,P.R.China

2018.11-2019.11 China Sodium benzoate Export Data

From 2018.11 to 2019.11, total export volume of Sodium benzoate from China was 1,349,159KG while total export value was $5,577,508. The biggest proportion of exporting volume in the last 12 months was 13.37% in 2019.03.

2018.11-2019.11 TOP10 Purchasing Countries' Export Data of Chinese Sodium benzoate

From 2018.11 to 2019.11, China has exported Sodium benzoate to 11 countries in total. Country ranks by import volume from high to low is Hongkong, Thailand, Russia, India, Vietnam, Pakistan, Kazakstan, Malaysia, Kampuchea (cambodia ), Poland. The highest export volume was China to Hongkong, accounting for 48.10% of the total volume of China.

Check Export Data for More Purchasing Countries

Purchasing Country Export Volume(KG) Export Percentage Export Value($)

Hongkong

1,203,496

48.10%

5,191,260

Thailand

76,658

3.06%

29,686

Russia

32,000

1.28%

216,206

India

19,006

0.76%

95,030

Vietnam

7,096

0.28%

23,048

Pakistan

5,000

0.20%

8,881

Kazakstan

2,275

0.09%

7,135

Malaysia

2,000

0.08%

3,200

Kampuchea (cambodia )

1,015

0.04%

2,842

Poland

500

0.02%

56

Indonesia

113

0.00%

164

Price Analysis

  • 2021-06-16

    Due to the serious increase in ocean freight, the factories have a large inventory, and Tianjin Dongda Tengzhou Tenglong announced that new products will be launched in July. Price is expected to fall. USD offers of Sodium Benzoate Powder Food Grade is 1150USD/MT FOB Qingdao.

  • 2021-05-31

    The price of toluene, the raw material, has decreased slightly, and ocean freight has fluctuated greatly. USD offers of Sodium Benzoate Powder Food Grade is 1150USD/MT FOB Qingdao.

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