Circulating fluidized bed pyridine base preparing reaction equipment

Abstract

The invention relates to the technical field of carbon and nitrogen containing compound production, in particular to circulating fluidized bed pyridine base preparing reaction equipment. The equipmentcomprises a regenerator, a reactor assembly, a regenerated catalyst circulation line and a spent catalyst circulation line I; the mode of connecting a first reactor, a second reactor and a third reactor in series is adopted for making gaseous formaldehyde, acetaldehyde and ammonia gas make sufficient contact with and react with a catalyst, and meanwhile the third reactor makes the reaction conducted more thoroughly; the contact efficiency of reactant is greatly improved, and the yield of products is increased; feeding adopts spray nozzle spraying, and compared with an original distribution loop distributor, a spray nozzle is not subjected to coking; the regenerated catalyst circulation line and the spent catalyst circulation line are adopted, the activity of the catalyst and the catalyst-oil ratio can be flexibly adjusted, and the tube catalyst concentration can be improved. The whole device is simple in structure, capable of saving materials, low in manufacturing cost, easy to make and beneficial to continuous and automatic production and environmental protection processing of the production process.

Description

Technical field [0001] The invention relates to the technical field of production of carbon and nitrogen-containing compounds, in particular to a reaction device for preparing a pyridine base in a circulating fluidized bed. Background technique [0002] Pyridine base is an important chemical raw material. Pyridine and 3-methylpyridine have high chemical and biological reactivity, so it is widely used as synthetic medicine, pesticides, spices, feed additives, rubber additives, dyes, Raw materials for surfactants, food additives, binders, synthetic materials, etc. The current method for producing pyridine base is mainly the aldehyde ammonia method, and the process used is a fluidized bed process. At present, a single fluidized bed reactor is commonly used at home and abroad. The typical structure is to use an equal diameter reactor and regenerator arranged side by side. There is a raw material feed distribution ring at the bottom of the reactor, and the reactor bed is generally de...

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Problems solved by technology

Chinese patent No. 200810055443.5 proposes a carbon disulfide fluidized bed production process. This patent adopts a reactor structure model with coaxial arrangement of pre-lift, riser and settler. The reactants are added from the riser and come from the pre-lift. The reaction is carried out after the catalyst is mixed, and the reacted product enters the settler after the rapid separation at the end of the riser reactor. The riser is drawn out, and the reactor adopts the riser reactor as the reaction place, which can effectively reduce the coking of the catalyst caused by the reverse mixing. In addition, under the same processing capacity, due to the high operating gas velocity in the riser, the The diameter of the reactor is much smaller than that of the fluidized bed reactor, so the riser reactor can be fed by nozzles, but the riser is used alone as the reactor, and the overall adjustment capacity of the device is small, so it is not suitable for variable pyridine bases Market demand, thus the need to design products that can produce different product distributions

The patent literature with Chinese patent number 200810084405.2 proposes a coupling reaction device between a riser and a gas-solid circulating bed. The reaction device adopts a method in which a riser reactor and a settler are coaxially connected in series, and the upper part of the riser reactor extends into the settlement In the reactor, the patent sets a gas-solid distribution plate at the end of the riser reactor, and a circulating bed reactor is set above the gas-solid distribution plate. In actual implementation cases, it can be adjusted by adjusting the bed height of the circulating bed reactor. The product distribution of the product is adapted to different market demands. This patent solves the problem of low adjustment capacity of a single riser reactor, and combines the advantages of the riser reactor and the fluidized bed reactor. In addition, in order to make the riser reactor The concentration can be adjusted flexibly. The patent also sets a catalyst circulation feed line between the loop reactor and the riser reactor, but this patent is applicable to the oil refining industry. ①The reactions involved in the oil refining industry are related to those involved in the synthesis of pyridine base different reactions, so in order to adapt to the pyridine base synthesis reaction, different reaction equipment needs to be designed, ②The feed of the reaction device adopts the form of a single nozzle, which is not suitable for reactors with larger diameters

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