Benzoic Acid

BENZOIC ACID
Product name: Benzoic Acid
Synonymous: 4-Carboxypolystyrene
CAS: 65-85-0
EINECS: 200-618-2
Molecular formula: C7H6O2
Molecular weight: 122.12
Molecular structure:

Properities
Appearance: White flakes or granulars
B. P.: 249° C
M. P.: 122.4° C
Flash point: 121-123° C
Density: 1.2659g/cm3
Packing: 25kg bag.
Shipment: 20mt/20' FCL.
The specification:
Purity: 98.0% min
Melting point: 120 ~ 123° C
Usage: Used as raw materials of dye intermediate, paint synthesis, plasticizer and preservative.

Brief introduction:
Engaged in deep processing of Benzoic Acid for many years, right now our Benzoic Acid annual output is 2, 500 tons. With advantages of raw material and technology, enable our product always to keep competitive in the international market. We will take the Benzoic Acid as the main product to work out a series of food additives.

PROCESS FLOW:
Benzoic acid is prepared by oxidation of toluene with an oxygen containing gas.
Put toluene and Cobalt naphtenate of measured scale into oxygenation tower, rise the temperature to 140° C. Three hours later, keep 165° C-180° C, 0.6-0.70Mpa, react for 18-22 hours. When the percent conversion reach 65-75%, suppress into distillation still, boil up non-reacted toluene, make the assay of benzoic acid reach 89% min.
Put the rough benzoic acid into first and second fractionating tower, control temperature, vacuum, reflux rati, get refined benzoic acid 98.0% min from tower top.
Reacting equation: 2C6H5CH3 + 3O2 ___> 2C6H5COOH + 2H2O
Cobalt naphtenate