Basic information

Foreign name

Neopentyl glycol

alias

2,2-Dimethyl-1,3-propanediol; 2,2-Dimethyl-1,3-propanediol

chemical formula

C5H12O2

molecular weight

104.15

CAS accession number

126-30-7

EINECS accession number

204-781-0

melting point

124-130℃

boiling point

210°C

water soluble

Soluble in water, lower alcohols, lower ketones, ethers and aromatic compounds, etc.

Density

1.06g/ml

Exterior

white crystalline solid

Flash point

107°C

should apply

Mainly used in the manufacture of resins, plasticizers and surfactants

security description

In case of accidental contact with eyes, rinse immediately with water and seek medical advice; wear goggles or a mask

hazard symbol

R36

Hazard statement

irritate eyes

Table of contents.1 Detailed introduction

.▪ Physical and chemical properties

.▪ Toxicity

.▪ Synthetic method

.▪ Main purpose

.▪ Packaging, storage and transportation

.▪ Security Terminology

.▪ Risk terms

.2 Precautions

detailed introduction

English alias: 2,2-Dimethyl-1,3-propanediol; 2,2-Dimethylpropane-1,3-diol

Structural formula: see the picture above [2]

Physical and chemical properties

Appearance: white crystalline solid

Density: 1.06g/ml (21°C)

Melting point: 124-130°C

Boiling point: 210°C (760mmHg)

Flash point: 107°C

Spontaneous ignition point: 399°C

Sublimation temperature: 210°C

Solubility: Easily soluble in water, lower alcohols, lower ketones, ethers and aromatic compounds, etc.  [1]

toxicity

Low toxicity. Rat oral LD50≥6400mg/kg. Mice oral LD50 is 3200-6400mg/kg. Less irritating to skin. However, drinking a lot of it can stimulate the central nervous system, causing symptoms such as vomiting, fatigue, drowsiness, dyspnea, tremor, kidney congestion and hemorrhage, liver fatty disease, urinary retention, bronchitis and pneumonia, and even death in severe cases.

resolve resolution

1. Sodium formate method Isobutyraldehyde and formaldehyde are condensed at 30-35°C, pH value 9-11, in the presence of an alkali catalyst to generate hydroxy-tert-butyraldehyde, and excess formaldehyde is reduced to neopentyl glycol under strong alkali conditions, and formaldehyde is then Oxidation, and react with alkali to generate sodium formate. The reaction solution is neutralized with formic acid, dehydrated by distillation under reduced pressure, the concentrated solution is subjected to layered extraction, sodium formate is removed, cooled, crystallized and separated to obtain the finished product.

2. Hydrogenation method It is obtained by condensation of isobutyraldehyde and formaldehyde to obtain hydroxypivalaldehyde, which is then reduced by hydrogenation.  [1]

The main purpose

Neopentyl glycol has a wide range of uses, mainly as plasticizers for the production of unsaturated polyester resins, oil-free alkyd resins, polyurethane foams and elastomers, additives for advanced lubricants and other fine chemicals. Neopentyl glycol is an excellent solvent for the selective separation of aromatics and cycloalkyl hydrocarbons. Neopentyl glycol is resistant to water, chemicals, and weathering. Its amino baking varnish has good gloss retention and is non-yellowing. It can also be used as a raw material for the production of polymerization inhibitors, stabilizers, and pesticides.  [1]

Packaging, storage and transportation

The solid is packed in bags, the inner layer is a plastic bag, and the outer layer is a woven bag, 25KG/bag.

The liquid is packed in galvanized iron drum, 25kg/drum.

Store in a cool, ventilated place, protected from sun, heat and moisture. Store and transport according to general chemical regulations.  [2]

security terms

S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

After accidental contact with eyes, rinse immediately with plenty of water and seek medical advice.

S39: Wear eye / face protection.

Wear goggles or a mask.

risk term

R36: Irritating to eyes. Irritating to eyes.  [2]

Precautions

1. When storing, keep the packaging intact. It should be stored separately from oxidants and food chemicals, and should not be stored together. Explosion-proof lighting and ventilation facilities are adopted. Prohibit the use of mechanical equipment and tools that are prone to sparks. The storage area should be equipped with leakage emergency treatment equipment and suitable containment materials. Do not contact with open flames. It should be kept ventilated, dry, and protected from sunlight. The storage temperature is -50°C to 45°C.

2. When operating, the airtight operation should be carried out, and the ventilation should be strengthened. Operators should wear chemical safety goggles, anti-poison infiltration overalls, and rubber oil-resistant gloves. Keep away from fire, heat sources, and smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Prevent vapors from escaping into workplace air. Avoid contact with oxidants. When packaging, care should be taken to prevent static electricity from accumulating, and there should be a grounding device. When handling, load and unload lightly to prevent damage to the packaging. Equipped with corresponding types and quantities of fire-fighting equipment and leakage emergency treatment equipment.  [2]