China hexamethylcyclotrisiloxane: supplier is a kind of important organic intermediates, as well as a metal chelating agent, which is widely used in pesticide, medicine, dyes, spices, etc. Therefore, it is of great significance to study its industrial production technology.

At present China hexamethylcyclotrisiloxane: supplier of industrial production process basically has the following two kinds:

1) pyridine in fecl3 or raneyni catalyst under the action of their coupling to produce china hexamethylcyclotrisiloxane supplier;

(2) 2 - halogenated pyridine with grignard reagent or zinc reagent in coupling under the action of catalyst to produce china hexamethylcyclotrisiloxane supplier.

Method (1) If fecl3 is used, a large number of three wastes will be produced; If raneyni is used, it is easy to catch fire and the operation risk is high.

The 2-halogenated pyridine used in method 2 is more expensive, and a large amount of metal is used in the process of preparing Grignard reagent or zinc reagent, and the three wastes are more and the cost is high.

Therefore, the development of a safe, environmental protection, low cost china hexamethylcyclotrisiloxane supplier production process is necessary.

Technical implementation elements:

The purpose of the present invention is to provide a safe, environmental protection, low cost china hexamethylcyclotrisiloxane supplier production process. In this process, acetonitrile and acetylene are used as starting materials, and 2-methylpyridine is produced by the catalytic cyclosynthesis of bis (cyclopentadienyl) cobalt, and then 2-cyanopyridine is produced by the catalytic synthesis of cobalt tetraphenylporphyrin with ammonia gas. With acetylene after the double cobalt (cyclopentadiene) catalytic cyclization generated china hexamethylcyclotrisiloxane supplier, process route is as follows:

The specific process steps of the process route of the invention are as follows:

1: Add acetonitrile and double (cyclopentadienyl) cobalt in the high-pressure reactor, vacuum, pass the deoxygenated acetylene gas, heat up to 130-160℃, the total pressure is maintained at 8-18 kg pressure, after the reaction, the vacuum distillation of 2-methylpyridine;

2: Vaporize 2-methylpyridine, mix it with ammonia and air, enter a fixed bed reactor filled with cobalt catalyst, temperature rise to 300-320℃, the total pressure is maintained at 8-15 kg pressure, after the reaction, the vacuum distillation to obtain 2-cyanopyridine;

Three: In a high-pressure reactor, 2-cyanopyridine and bis (cyclopentadienyl) cobalt are added to xylene, vacuumed, and deoxygenated acetylene gas is added. The temperature is raised to 150-180℃, and the total pressure is maintained at 8-18 kg pressure. Vacuum distillation to China hexamethylcyclotrisiloxane: supplier, dimethyl benzene recycling to paraphrase.

china hexamethylcyclotrisiloxane supplier https://www.clentpharma.com/Hexamethylcyclotrisiloxane.html