Acetonitrile is an important fine chemical intermediate product and chemical solvent. It can be used as an intermediate of medicine and perfume, and in organic synthesis, it is often used to prepare triazine, dipropionitrile, imidazole, propylene bisacetonitrile and ethylamine products.
There are many methods for synthesizing acetonitrile, which can be divided into direct synthesis method and indirect synthesis method according to different synthesis methods. The direct synthesis method includes acetic acid and ammonia reaction, propylene and ammonia reaction, ethanol and ammonia reaction, etc. The indirect method is mainly to synthesize propylene A method for simultaneously by-producing acetonitrile with nitrile. At present, the production route of acetonitrile is mainly acrylonitrile by-product route. Since it is a by-product of acrylonitrile production, there are many impurities in the system, so the product quality is difficult to guarantee, the production energy consumption is high and the output is limited.
higher production efficiency
A production process with higher production efficiency is now proposed for the deficiencies of the traditional manufacturing method, which is characterized in that it comprises the following steps:
- Using monoethylamine as raw material, and pumping monoethylamine into the preheater for preheating and vaporization after metering, the preheating temperature is controlled at 150℃-180℃;
- After preheating and vaporization, it enters the reactor, using Cu-Zn/Al2O3 as catalyst, the control pressure is 0.1-2.0Mpa, the temperature is 250℃-500℃, the liquid space velocity of monoethylamine is 0.2-4.0h-1, and the amount of catalyst is 0.2 The dehydrogenation reaction was carried out under the condition of -2.0m3-ethylamine/(hr·m3catalyst); when the pressure of the reaction system remained unchanged, the reaction was terminated; wherein, calculated by weight ratio, the composition of the catalyst was: Cu was 5%-30 %, Zn is 1%-50%, and the rest is Al2O3;
- After the reaction, the material is condensed and cooled by cooling water at 10°C-15°C, and then gas-liquid separation is carried out. The gas phase hydrogen is processed and refined and sold as a product; At 50°C, acetonitrile product can be obtained; the separated monoethylamine is returned to the feeding system, and then enters the reactor to continue the reaction.
