What are the hazards of glacial acetic acid to humans?

Glacial acetic acid, also known as ice vinegar, is a chemical substance. It is very harmful to the human body and can easily endanger human health. Inhaling or consuming glacial acetic acid can easily cause damage to the body's internal organs. Because glacial acetic acid contains a lot of irritation, it can easily cause harm to human skin after contact, and can easily cause erythema or burns on the skin.

1. Health Hazards

Routes of entry: inhalation, ingestion, and percutaneous absorption.

Health Hazards: Irritating to nose, throat and respiratory tract if inhaled. Strongly irritating to eyes. In case of skin contact, erythema may occur in mild cases and chemical burns may occur in severe cases. If concentrated acetic acid is accidentally ingested, erosions may occur in the mouth and digestive tract, and in severe cases, death may occur due to shock.

Chronic effects: eyelid edema, conjunctival hyperemia, chronic pharyngitis and bronchitis. Long-term and repeated contact can cause skin dryness, defatting and dermatitis.

use

Uses: Mainly used in the synthesis of vinyl acetate, cellulose acetate, acetic anhydride, acetate esters, metal acetates and halogenated acetic acid, etc. It is also an important raw material for pharmaceuticals, dyes, pesticides and other organic syntheses. In addition, it is also widely used in the manufacture of photographic drugs, cellulose acetate, textile printing and dyeing, and rubber industry, as well as raw materials for manufacturing plastics, dye solvents, photography, medicine, pesticides, and other organic syntheses.

Appearance

Acetic acid, with a content of about 30%, is liquid at room temperature. Glacial acetic acid is considered pure acetic acid when its content is above 98%. This acetic acid is liquid above 14 degrees Celsius and solid below 14 degrees Celsius. It looks very much like ice, so it is called glacial acetic acid. Even if it is not freezing in the north, you should still take precautions against freezing.

The vinegar we eat contains about 3% acetic acid. White vinegar is blended with acetic acid. It has sufficient acidity but a poor taste. Brewing vinegar contains a lot of flavor substances and tastes good.

The freezing point of glacial acetic acid should be 16.6 degrees. Below 16 degrees, it is solid, just like water freezing.

Standard Description This standard applies to industrial glacial acetic acid produced from acetylene, ethanol and ethylene as raw materials; it also applies to industrial glacial acetic acid produced by co-oxidation of paraldehyde and xylene.

Molecular formula: C2H4O2; CH3COOH

Molecular weight: 60.05 (according to the 1985 international atomic weight)

Density: 1.0492

Boiling point: 117.9°C

CAS No.: 64-19-7

Technical requirements

Industrial glacial acetic acid should meet the following requirements

Project indicators

Superior product, first-class product, qualified product

Chroma, (platinum-cobalt) number ≤ 10 20 30

Acetic acid content, % ≥ 99.5 99.0 98.0

Formic acid content, % ≤ 0.10 0.15 0.35

Acetaldehyde content, % ≤ 0.05 0.05 0.10

Evaporation residue, % ≤ 0.01 0.02 0.03

Iron content, % ≤ 0.0001 0.0002 0.0004

Heavy metal (as Pb), % ≤ 0.0001 0.0002 0.0004

Potassium permanganate oxidation time, min ≥ 20 5 -