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Published on February 23, 2022, the Bureau of Indian Standards (BIS) is consulting on a draft Indian Standard (IS) for terephthalic acid. The deadline for comments is March 19, 2022.
Terephthalic acid is derived by oxidation of p-xylene using soluble bromide, metal acetates and acetic acid solvent. It is used in the production of synthetic resins, fibers and films by combination with glycols. Breathing terephthalic acid can irritate the nose, throat and lungs causing coughing, wheezing or shortness of breath.
This standard prescribes requirements, methods of sampling and test for terephthalic acid, with reference to the following standards:
IS No. | Title |
265 : 2021 | Hydrochloric acid — Specification (fifth revision) |
266 : 1993 | Sulphuric acid — Specification (third revision) |
460 (Part 1) : 2020 | Test Sieves — Specification Part 1 Wire Cloth Test Sieves (fourth revision) |
915 : 2012 | Laboratory glassware — One - Mark volumetric flasks (third revision) |
1070 : 1992 | Specification for water for general laboratory use (third revision) |
2362 : 1993 | Determination of water by Karl Fisher method — Test Method (second revision) |
4161 : 1967 | Specification for Nessler cylinders |
It proposes the following requirements for terephthalic acid:
Characteristic | Requirement |
Moisture content, percent by weight, Max | 0.2 |
Colour, Pt-Co units, Max | 10 |
Ash content, ppm, Max | 10 |
Acid value, mg KOH /g | 675 ± 2 |
Total of iron, cobalt, manganese, chromium and titanium, ppm, Max | 5 (each not greater than 1 ppm) |
Total of sodium, magnesium, potassium, calcium and nickel, ppm, Max | 5 (each not greater than 1 ppm) |
4-carboxybenzaldehyde, ppm, Max | 25 |
4-carboxybenzaldehyde + p-toluic acid, ppm, Max | 195 |
The terephthalic acid shall be stored in 1000 kg flexible woven plastic containers as agreed between the purchaser and the supplier. The packages shall be marked with the following information:
a) Name of the material,
b) Name of manufacturer and his recognized trade-mark, if any;
c) Month and year of manufacture;
d) Net mass of the material in the container;
e) Lot or batch number; and
f) Any other statutory requirements.
Once the draft is approved, products conforming to the requirements of this standard could be certified with the BIS and be marked with the Standard Mark.
