mvr rectification stripping compound device and its process method

Abstract

The invention relates to an MVR rectification and stripping composite device and a process method thereof, belonging to the technical field of rectification processes. The MVR rectification and distillation compound device includes a one-stage MVR rectification unit and a multi-stage MVR stripping unit. The configuration stages of the multi-stage MVR stripping unit are determined according to the raw material composition and the purity requirements of separation. According to the MVR stripping The location of the unit is different, and it is divided into the last-stage MVR stripping unit and the intermediate-stage MVR stripping unit. The composite device of the present invention can significantly reduce the process energy consumption of liquid mixture separation through the high-efficiency coupling of rectification process and stripping process. At the same time, the invention also provides a process method using the device, which is simple and easy to implement, has strong adaptability to changes in the concentration ratio of the raw material liquid, and has high operating flexibility. In the case of saving energy consumption, the separation of the mixed liquid can be made more thorough, significantly Improve the purity of the separated liquid to meet the production requirements of the process.

Description

technical field [0001] The invention relates to an MVR rectification and stripping composite device and a process method thereof, belonging to the technical field of rectification processes. Background technique [0002] As a separation process of liquid mixtures, rectification is widely used in various fields of industry and is the most commonly used chemical operation unit. It is one of the most effective methods for separating homogeneous liquid mixtures. However, rectification is a process in which components are separated by repeated evaporation and condensation with different boiling points. The traditional rectification process consumes a lot of energy, has a large waste heat, and has low thermodynamic efficiency. MVR technology has been widely used in the field of evaporation, and also in the rectification process, that is, heat pump rectification, but the application range is very limited, mainly because the temperature difference between the top and bottom of the r...

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Problems solved by technology

In this process, the traditional multi-effect rectification consumes a lot of energy, and it is difficult to meet the above separation requirements; in the existing MVR heat pump rectification technology, the operating efficiency of the compressor is very low, the energy consumption is large, and the separation purity is difficult to achieve Process requirements; split heat pump rectification technology is designed based on the determined raw material composition, the concentration of the top liquid after separation and the concentration of the bottom liquid, and has a certain energy-saving effect. The energy-saving effect of the distillation system will be severely reduced, or even unable to run stably, and the separation process cannot meet the production process requirements

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