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Benzoic Acid

Benzoic Acid
Benzoic Acid
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Product Code : AFCOT006
Brand Name : GLAB
Product Description

The name benzoic Acid, C7H6O2 is derived from the gum benzoin which for a long time was the only source for benzoic acid. It is a simple aromatic carboxylic acid and a colourless crystalline solid.

Boiling Point  249.2°C
Density  1.27 g/cm³

Usage-
The main use of benzoic acid is in the production of Phenol by oxidative decarboxylation at a temperature of 300-400 °C:
C6H5CO2H + ½ O2 º C6H5OH + CO2

By addition of catalytic amounts of copper (II) salts, the temperature can be lowered to 200°C. The phenol can be later converted to cyclohexanol, a starting material for nylon synthesis.

Precusors to plasticizers

By transesterification of methyl benzonate with the corresponding diol, benzonate plasticizers such as glycol-diethylenegylol, and triethyleneglycol ester are obtained. These are also obtained by treatment of benzoycloride with the diol. Their uses are similar to those derived from terephthalic acid ester.

Benzonic acid inhibits the growth of mold, yeast and some other bacteria and are therefore used as food preservatives and are represented by E-numbers E210, E211, E212, and E213. It is either added directly or created from reactions with its sodium, potassium, or calcium salt. The mechanism starts with the absorption of benzoic acid into the cell. If the intracellular pH changes to 5 or lower, the anaerobic fermentation of glucose through phosphofructokinase is decreased by 95%.

The international food law controls the uses and maximum level of application of benzonic acid in food. Typical levels of use for benzoic acid as a preservative in food are between 0.05-0.1%. However concern has been expressed that benzoic acid and its salts may react with ascorbic acid (vitamin C) in some soft drinks, forming small quantities of benzene.

Medicinal Usage:

Products of benzonic acid have a long history of use as topical antiseptics and inhalant decongestants. During the beginning of 20th century, the applications areas of Benzoic acid were as an analgesic, expectorant, and antiseptic. Its main use is in the treatment of fungal skin diseases like athlete's foot, ringworm, and tinea. It is also a major component of benzoin resin. Adding on, the benzoic acid is also used as the principal ingredient Friar's balsam and tincture of benzoin.

Benzoyl chloride

Benzoic acid is forerunner to the benzoyl chloride (C6H5C(O)Cl). It is an important starting material for several benzoic acid derivates like benzyl benzoate, which finds use in insect repellents and artificial flavours.

Laboratory uses

Benzoic acid is largely used in teaching laboratories, as the common standard to calibrate the bomb calorimeter.

Benzoic Acid

Sr No.

Characteristics

Specifications

1

assay  

99.5-100.5%

2

heavy metals (as Pb)

0.0005%

3

halogen compounds (as Cl)

0.03%

4

water

0.7%

5

ign. residue   (as SO4)

0.05%

6

pH  

3-5 (20 °C, 0.1%)

7

bp  

249 °C(lit.)

8

mp  

121-125 °C(lit.)

9

As

3 mg/kg

10

Cu

10 mg/kg

11

Hg

1 mg/kg

12

Pb

2 mg/kg

13

Zn

20 mg/kg


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