Dicyclopentadiene continuous cracking novel process

Abstract

This invention relates to a new style dicyclopentadiene series lytic craft. Preheat dicyclopentadiene, then enter lytic device after vaporizing to proceed lytic response; after reaction finishing, carry out separation to gain monocyclic ring pentadiene. The heating of lytic device adopts internally fired mode. This invention through change the technical process and type of heating, internal heating instead externally heating, to advance thermal efficiency, decrease slagging, and advance productive capacity. This invention could advance double productive capacity for the same heat consumption, and decoking cycle is prolonged 4 to 5 times.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a process for continuously producing monocyclopentadiene by using dicyclopentadiene as a raw material. Background technique [0002] Imidacloprid is a new generation of neonicotinoid insecticides, with global sales of 1 billion US dollars. China is a big country that produces and uses imidacloprid. There are more than 20 domestic manufacturers of imidacloprid, and their process routes are all using dicyclopentadiene as the The starting material is cracked into monocyclopentadiene, and monocyclopentadiene is used as a carrier to self-synthesize pyridine ring through a series of reactions, but all manufacturers have large investment in equipment and low production capacity in the production of dicyclopentadiene cracking process , severe coking, and high labor intensity of workers. [0003] At present, most of the cracking methods used in China are: kettle cracking (see...

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Problems solved by technology

[0003] At present, most of the cracking methods used in China are: kettle cracking (see Figure 1), using heat transfer oil as the heat carrier. This process is less efficient and the cost of the heat carrier is also high. The heat carrier needs to be replaced every three batches. Heat transfer oil, the average yield of every three batches is 88-90%, and the consumption of heat carrier is also high. The consumption of heat transfer oil per ton of monocyclopentadiene is 250 kg, the production cost is high, and the amount of waste residue is increased at the same time, which is uneconomical to waste resources. also pollute the environment

[0004] Secondly, adopt direct external heating cracking, without heat carrier (see Figure 2), use stainless steel tube as cracking tube, outer wall is heated on the ceramic tube with electric heating wire, heat is conducted to ceramic tube by electric heating wire and then passed to cracking tube, this The heat transfer resistance of the method is large, the thermal efficiency is low, and the energy supply is insufficient, resulting in low output. The radial temperature difference of the cracking tube is large, and the temperature near the cracking tube wall is much higher than the center temperature of the cracking tube. The main cause of coking

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