Method for separating liquid-phase organic mixture by utilizing phase change of hydrate

Abstract

The invention discloses a method for separating a liquid-phase organic mixture by utilizing phase change of hydrate, belonging to the field of separation science and technology. According to the method, through generation and decomposition of the hydrate, separation of all components of the liquid-phase organic mixture can be achieved at a temperature ranging from 0 DEG C to 25 DEG C; water serves as a unique reagent, other chemical reagents are not needed, and all the pure components of the liquid-phase organic mixture can be obtained at the same time, so compared with other separation methods which only can obtain one relatively pure component, separation in the invention is more efficient; and according to a traditional method, organic mixture systems with similar boiling points need extremely high energy consumption or addition of chemical reagents to achieve separation and purification, and according to the method, liquid-phase organic mixture separation is achieved only by utilizing the characteristic that whether all components can generate hydrates under the operation condition or not, so the method is more advantageous for liquid-phase organic mixtures with similar boiling points.

Description

technical field [0001] The invention belongs to the field of separation science and technology, and relates to a liquid-phase organic mixture separation method utilizing hydrate phase transition. Background technique [0002] The raw materials and products involved in chemical production are usually a mixture of multiple components. For further processing and utilization, the mixture needs to be separated into relatively pure substances. For liquid-phase organic mixtures, the most commonly used separation methods are rectification, derivatization, and crystallization. Distillation is the separation of organic mixtures by utilizing the different boiling points of the components. However, if the boiling points of the components in the liquid-phase organic mixture are similar, the number of plates required will be very large, and the reflux ratio will be very high, so that the energy input required for the separation process will be large, and the separation cost will be incre...

AI Technical Summary

Problems solved by technology

However, if the boiling points of the components in the liquid-phase organic mixture are similar, the number of plates required will be very large, and the reflux ratio will be very high, so that the energy input required for the separation process will be large, and the separation cost will be increased.

The derivatization method is to chemically react the organic mixture to be separated with a certain substance to generate derivative isomers with a large difference in boiling point, and then separate them by rectification and reduction. There are problems such as complicated process and low product yield.

The crystallization method is to reduce the liquid phase organic mixture to a certain temperature so that the substance with a higher melting point is crystallized and separated first. The main problem is that the low temperature condition required for the separation process makes the energy consumption huge

At the same time, other methods also have their own shortcomings

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