Evaporation method and device easy for polymerizing hydrocarbon solution

Abstract

The present invention provides an evaporation method and apparatus for an easily polymerizing hydrocarbon solution, said evaporation method includes processes that: the easily polymerizing hydrocarbon solution is fed into a main evaporator(1),the evaporated hydrocarbon gas is discharged from the top of the main evaporator(1), the evaporated liquid components are drawn out via a cycle pump(2) from the bottom of the main evaporator(1), part of them being circularly fed into the main evaporator(1) and part of them being fed into a film evaporator(3). The evaporated hydrocarbon gas is then discharged from the top of the film evaporator(3) and the remnant liquid after evaporation is forced to be discharged from the film evaporator(3). The forced circulation evaporator and the film evaporator in this invention combines to realize the evaporation process, the polymeric monomer in the easily polymerizing hydrocarbon solution is not subject to polymerization, thereby improving the evaporation efficiency, maintaining the steady operation, lowering the consume of source and energy.

Description

technical field [0001] The invention relates to a method and a device for evaporating a hydrocarbon solution into a gas phase. Background technique [0002] In the chemical industry and petrochemical industry, a large number of processes that need to evaporate hydrocarbon solutions into gases are involved. For example, the by-products of ethylene cracking units crack C9 methyl styrene and C10 dicyclopentadiene, vinyl ethylbenzene, In the hydrogenation process such as divinylbenzene, the cracked C9 and C10 are evaporated. Because cracking C9 and C10 are rich in olefins and colloids, polymerization is very easy to occur in the conventional evaporation process, which seriously affects the evaporation efficiency and the stable operation of the device, resulting in a short operation period of the device and high material consumption and energy consumption. [0003] One such situation is described in Chinese patent 200610122691.8: [0004] In the crude benzene hydrogenation proc...

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Problems solved by technology

[0004] In the crude benzene hydrogenation process, the crude benzene contains 3-10% organic polymerized monomers, and the traditional evaporation technology is used in the evaporation process, and polymerization is also very easy to occur. Similarly, it seriously affects the evaporation efficiency and the stable operation of the device , Hebei Chemical Industry 2004 No. 1 Issue P44 "Application of Polymerization Inhibitor HK-17A in Coking Crude Benzene" describes such a situation; Fuel and Chemical Industry Vol. "Application in Distillation" also describes such a situation, even if a large amount of polymerization inhibitor is used, polymerization blockage still occurs, which affects the long-term stable operation of the device

[0005] In the production process of divinylbenzene, diethylbenzene is dehydrogenated to form vinylethylbenzene and divinylbenzene. In order to obtain more than 80% of divinylbenzene and reduce the consumption of raw material diethylbenzene, it is necessary to use higher The diethylbenzene solution with vinylethylbenzene concentration evaporates into the gas phase, and high-concentration vinylethylbenzene is prone to cross-linking and polymerization, which seriously affects the evaporation efficiency and the stable operation of the device, and increases the material consumption and energy consumption of the device.

[0006] In the industrial production of styrene, the separation efficiency of the ethylbenzene recovery tower is often not high, resulting in a high content of styrene in the circulating ethylbenzene, up to 20% in some devices, and the same high concentration of styrene is prone to cross-linking polymerization , thus seriously affecting the evaporation efficiency and the stable operation of the device, increasing the material consumption and energy consumption of the device

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