Method for removing unreacted alcohols from esters products mixture utilizing rotating packed bed

A technology of rotating packed bed and product mixture, which is applied in the separation/purification of carboxylate, organic chemistry, etc., to achieve the effect of improving industrial utilization value, improving the quality of ester products, and shortening the removal time

Inactive Publication Date: 2007-06-13
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this technology is a new technology that only appeared in the 1980s, the internal mass transfer mechanism is still being explored, so its new application areas still need to be continuously developed. For example, there have been no public reports on the application of dealcoholization

Method used

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  • Method for removing unreacted alcohols from esters products mixture utilizing rotating packed bed
  • Method for removing unreacted alcohols from esters products mixture utilizing rotating packed bed
  • Method for removing unreacted alcohols from esters products mixture utilizing rotating packed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Butyl stearate (BST) batch n-butanol removal (NBA) tests were performed using a system similar to that of Figure 1 . The specifications of the rotating packed bed are: inner diameter 78mm, outer diameter 160mm, thickness 20mm. The speed is fixed at 1300rpm. The filling used is woven stainless steel wire mesh (specific surface area 1906m 2 / m 3 ). The filling porosity of the rotating packed bed is 0.91 (the porosity is 1 when the filling is not filled; the filling porosity is 0 when it is completely filled), and nitrogen is used as the degassing agent. During the experiment, the BST was fed into the rotary packed bed from the liquid inlet 3 and the liquid product from the liquid outlet 8 was introduced into the material tank 1 to return to the material tank 1. The experimental conditions and the obtained results are shown in the table. It can be found from this table that the NBA of the purified product sampled from the liquid outlet 8 at the 7th minute dropped to 2...

Embodiment 2

[0030] A continuous n-butanol removal (NBA) test for butyl stearate (BST) was performed using a system similar to that of Figure 1 . The specifications of the rotating packed bed are: inner diameter 20mm, outer diameter 40mm, thickness 20mm. The speed is fixed at 1300rpm. The filler used is woven stainless steel wire mesh with a specific surface area of ​​1546m 2 / m 3 . The packing porosity of the rotating packed bed is 0.90. Use water vapor as a degassing agent, and operate at low pressure with the aid of gas inlet 10 to pump air. During the experiment, the BST was fed into the rotating packed bed from the liquid inlet 3 and the purified product was collected from the liquid outlet 8 . The experimental conditions and the obtained results are shown in the table. From this table, it can be found that continuous treatment at low pressure by a rotating packed bed can reduce NBA to 43-49ppm.

Embodiment 3

[0032] Except that using isooctyl palmitate (EHP) instead of BST as the feed, the steps of Example 2 were repeated to carry out the test of continuous removal of 2-octanol (2-EH). The experimental conditions and the obtained results are shown in the table. From this table, it can be found that continuous treatment at low pressure through a rotating packed bed can reduce 2-EH to below 100 ppm.

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Abstract

The invention discloses a method for removing unreacted alcohols from esters products mixture utilizing rotating packed bed, wherein the ester product mixture is fed to around the axial center of the rotating packed bed, making the ester product mixture flow through rotating packing bed in a radial flow ,the unreacted alcohols and low-molecular-weight substances contained in the ester product mixture are extracted and vented through the top of the rotating packed bed, and the purified ester product can be collected at the bottom of the bed.

Description

technical field [0001] The present invention relates to a method for removing unreacted alcohols from ester product mixtures using mass transfer equipment, particularly a rotating packed bed. Background technique [0002] Esters are produced by the reaction of organic acids and alcohols. In the production process, alcohol is often added in excess to promote the completion of the reaction. The traditional reaction procedure is to connect a distillation tower above the reaction tank to separate the evaporated water from the alcohol, and the water is taken out and the alcohol is refluxed. Continue the reaction to completion. After the reaction is completed, the alcohol is distilled off. At this time, vacuum distillation is required to remove the residual alcohols. Generally, alcohol removal is under low pressure and takes a long time. However, prolonged heating will cause discoloration and deterioration of the quality of ester products. At present, most of the known methods ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/48C07C69/22
Inventor 刘文宗林佳璋杨胜何宗仁余铧堂
Owner IND TECH RES INST
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