Technological method for separating and refining butyl butyrate by using partition plate tower

Abstract

The invention relates to a technological method for separating and refining butyl butyrate by using a partition plate tower. The method comprises the following steps: arranging a partition plate in the middle of a butyl butyrate rectifying tower body, and dividing the butyl butyrate rectifying tower into a public rectifying section A, a public stripping section D, and a pre-fractionation section Band a side discharge section C on two sides of the partition plate; enabling the crude butyl butyrate to enter a pre-fractionation section through a crude preheater; arranging a liquid collector above the partition plate, descending liquid above the partition plate is collected and guided into a liquid distributor, and the allowing liquid distributor to distribute the liquid above the partition plate to a pre-fractionation section and a side line discharging section on the two sides of the partition plate; connecting the tower kettle reboiler to the bottom of the public stripping section D; and connecting a butyl butyrate rectifying tower side extraction pipeline to the shell pass gas phase inlet of the crude preheater. According to the technological method for separating and refining butyl butyrate, the mass concentration of butyl butyrate is 99% or above. The process has the characteristics of low process energy consumption, low equipment investment and the like, and has a wide application prospect.

Description

technical field [0001] The invention relates to a process method for separating and refining butyl butyrate by using a partition tower, in particular to obtain high-concentration butyl butyrate by rectifying crude butyl butyrate by using a partition tower. Background technique [0002] Although rectification technology has been widely used because of its mature technology, problems such as excessive equipment investment and high energy consumption for separation cannot be avoided in application, and it can no longer meet the requirements of energy-saving and efficient modern distillation technology. Thermocouple distillation is a complex distillation method, which can reduce the irreversible effective energy loss in the process, thereby reducing the energy consumption of the process. The clapboard column is also called a thermally coupled rectification column or a dividing wall rectification column. It is a completely thermally coupled rectification column. The internal spa...

AI Technical Summary

Problems solved by technology

If the crude butyl butyrate adopts the traditional multi-tower separation process, it usually needs to go through 2 to 3 rectification tower systems to complete the rectification operation of butyl butyrate. The residence time at high temperature leads to an increase in side reactions and the generation of by-products such as C8 and C12 esters. In this case, the difficulty of butyl butyrate separation is increased and the purity of butyl butyrate products is affected.

To solve this problem, it is necessary to increase equipment investment, heighten the tower body or increase subsequent rectification equipment, etc., but this will cause problems such as large equipment investment, large floor area, complicated operation, and high energy consumption.

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