Acetic acid evaporation and gas mixing integrated device

Abstract

The invention relates to an acetic acid evaporation and gas mixing integrated device, and solves problems of large investment on acetic acid reaction equipment, multiple related equipment and complex process control. The device comprises a shell, and an upper tube box, a steam heat exchanger zone and a lower tube box, which are formed by separation by an upper tube plate and a lower tube plate. The lower pipe box is divided into an upper segment mixing zone and a lower zone air inlet zone by a partition plate; the mixing zone is provided with a plurality of gas-liquid mixing tubes with a liquid inlet hole on a tube wall thereof; a lower end of the gas-liquid mixing tube is fixed on the partition board and communicated with the air inlet zone; Upper ends of heat exchanger tubes in the steam heat exchange zone are fixed on the upper tube plate and communicated with the upper tube box, and the lower ends are fixed on the lower tube plate and communicated with the gas-liquid mixing tubes. The shell is provided with a steam inlet and a steam outlet, which communicate with the steam heat exchanger zone; an a feed gas inlet communicates with a gas inlet zone; an acetic acid inlet communicates with the mixing zone; and a mixed gas outlet communicates with the upper tube box. The invention has advantages of simple structure, small volume, low investment and manufacture cost, simple control and long equipment usage life.

Description

[0001] Technology [0002] The invention relates to acetic acid reaction equipment, in particular to an integrated device for acetic acid evaporation and gas mixing. Background technique [0003] In recent years, with the soaring price of petroleum, coal, biomass, petroleum coke and other fuels are used as raw materials for gasification and then used as raw material gas to produce liquid fuels. In the industrial process, it is necessary to evaporate and hydrogenate acetic acid to generate ethanol, or to evaporate and add acetylene to acetic acid Gas synthesis of vinyl acetate. The currently recorded process requires at least two main equipment: an evaporator (central circulation tube evaporator) and a mixer (cyclone separator); the central circulation tube evaporator evaporates acetic acid at 140 ° C, The evaporated acetic acid vapor enters the cyclone mixer and mixes with hydrogen or acetylene to generate corresponding mixed gas. There are following problems in this process...

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Problems solved by technology

There are following problems in this process method: (1) the mode of gas mixing after first evaporating requires at least two sets of equipment and corresponding delivery pipelines of an evaporator and a mixer, and because the volume of the gas is greater than the volume of the liquid, the acetic acid solution is evaporated The production of acetic acid vapor not only requires a high evaporation temperature, but also requires a bulky evaporator. At the same time, in order to fully mix the acetic acid vapor and the raw material gas, a bulky mixer is also required, which makes the entire process difficult to control and occupies a large area. 1. Large equipment investment; (2) Since the acetic acid solution completely depends on evaporation and vaporization, the evaporation temperature is high, which will cause serious corrosion of the tube bundle in the evaporator and mixer. Once the corrosion is serious, it is easy to cause the system to stop, and the equipment must be replaced, affecting normal production.

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