Butyl Isocyanate is a colourless liquid, the vapour mixes well with air, explosive mixtures are easily formed.

Preparation method

A preparation method of butyl isocyanate is characterized by comprising the following steps:

(1) adding dimethylbenzene into a reaction kettle, and introducing phosgene through a phosgene introducing pipe, wherein the weight ratio of phosgene to dimethylbenzene is 5-20%;

(2) slowly dropwise adding n-butylamine at the low temperature of-20-30 ℃, wherein the weight ratio of the n-butylamine to the dimethylbenzene is 5-20%;

(3) after the dropwise adding is finished, stirring for reaction, and heating to 90-150 ℃ at a heating rate of 5-20 ℃/h;

(4) at the high temperature of 90-150 ℃, slowly supplementing phosgene, wherein the molar ratio of the phosgene to n-butylamine is 1.2-3: 1, until the material is in a clear and transparent state;

(5) stopping introducing phosgene, reacting for 1-5 hours, and removing phosgene with nitrogen;

(6) and rectifying to obtain the butyl isocyanate product.

Chemical dangers

Butyl Isocyanate may polymerize due to heating. Decomposes on burning. This produces toxic gases including nitrogen oxides and hydrogen cyanide. Reacts violently with strong oxidants and water.

Hazards

Highly flammable liquid and vapour

Fatal if inhaled

Harmful if swallowed

Causes severe skin burns and eye damage

May cause allergic skin reaction

Causes damage to lungs if inhaled

Storage

Fireproof. Separated from strong oxidants and food and feedstuffs. Cool.