Acetic acid cracking equipment for preparing ketene

Abstract

The acetic acid cracking device comprises a preheating section and a cracking section, the preheating section is composed of a preheating cavity and a first heat supply jacket, the bottom of the first heat supply jacket is connected with a natural gas inlet pipe and an air inlet pipe, and the lower section of the preheating cavity is connected with a metering pump and an acetic acid evaporator; the cracking section comprises a cracking cavity and a second heat supply jacket, the upper end of the cracking cavity is connected with a condensation pipe, and the bottom of the cracking cavity is communicated with the preheating cavity through a connecting pipe; a natural gas supplementing pipe and an air supplementing pipe are arranged at the lower end of the second heat supply jacket, a waste gas discharging pipe is arranged at the upper end of the second heat supply jacket, and the second heat supply jacket communicates with the first heat supply jacket through two symmetrically-arranged second connecting pipes. According to the invention, the problem of high energy consumption of the ketene process is solved, the mode of combining the first heat supply jacket and the second heat supply jacket is utilized, heat in the first heat supply jacket is fully utilized, the initial temperature of the second heat supply jacket is increased, and the use amount of natural gas is reduced.

Description

technical field [0001] The invention belongs to the technical field of ketene, and in particular relates to an acetic acid cracking device for preparing ketene. Background technique [0002] Ketene is the simplest ketene, which is a toxic gas at room temperature; ketene is mainly used in the synthesis of basic chemical raw materials and reagents, and is the main raw material for the production of food preservative sorbic acid; ketene is very unstable, difficult to store, and easy to use. Forms dimer diketene, which is a raw material for fine chemical dyes, pharmaceuticals, pesticides, food and feed additives, auxiliaries, etc. The current preparation process of ketene is as follows: acetic acid is cracked in a high temperature cracking furnace with triethyl phosphate, diammonium hydrogen phosphate, phosphoric acid, etc. as a dehydration catalyst at a high temperature of 700-800° C. to generate ketene. In the process of producing ketene by conventional processes, preheating ...

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Problems solved by technology

[0003] Aiming at the problems in the prior art, the present invention provides an acetic acid cracking equipment for preparing ketene, which solves the problem of high energy consumption in the ketene process, and utilizes the combination of the first heating jacket and the second heating jacket The method makes full use of the heat in the first heating jacket, increases the initial temperature of the second heating jacket, and reduces the amount of natural gas used

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