Method of increasing quality of glycol

A glycol and quality technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as unsuitable for large-scale continuous production, inconvenient separation and purification

Inactive Publication Date: 2007-10-24
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method is not suitable for large-scale continuous production, and the aluminum oxide and excess alkali generated by the reaction of aluminum-nickel alloy with strong alkali bring a lot of inconvenience to the subsequent separation and purification.

Method used

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  • Method of increasing quality of glycol
  • Method of increasing quality of glycol
  • Method of increasing quality of glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add about 200g of ethylene glycol with a mass concentration of 85% in a 500mL four-neck flask equipped with a stirrer, thermometer, and reflux condenser, add 2mL of palladium carbon as a catalyst, control the reaction temperature at 75°C, stir and pass hydrogen for 1h. The UV value changes of materials before and after hydrogenation are shown in Table 1. The hydrogenated material was rectified under reduced pressure to obtain ethylene glycol product, and its ultraviolet light transmittance and aldehyde content were measured. The results were compared with those of the product without hydrogenation rectification, as shown in Table 1.

Embodiment 2

[0019] As in Example 1, Raney nickel is used as a catalyst, and its consumption is the same as in Example 1, and the reaction temperature is 70°C. The changes in UV value and aldehyde content of materials and ethylene glycol products before and after hydrogenation are shown in Table 1.

[0020] Table 1 Comparison of main quality indicators of materials and products before and after hydrogenation

[0021]

[0022] After hydrogenation

Embodiment 3

[0024] As example 2, the mass concentration of ethylene glycol is 100%, and the reaction temperature is 95°C. The results are shown in Table 2.

[0025] Table 2 Comparison of main quality indicators of materials and products before and after hydrogenation

[0026]

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Abstract

The invention discloses an interval or continuous catalytic hydrogenating for ethandiol (weight density at 10-100%), which is characterized by the following: adopting aggregate nickel or palladium carbon as catalyst; transmitting C=C and C-O into saturated material not to adsorbed by ultraviolet in the ethandiol; reducing the content of aldehyde; improving ultraviolet transmission rate; controlling the reacting temperature between 45 deg. c and 95 deg. c; setting the reacting pressure between 0. 05 and 0. 5Mpa and air speed not less than 60h-1; obtaining the product with ultraviolet transmitting rate more than 90% at 220nm, more than 95% at 275nm, more than 99% at 350nm.

Description

technical field [0001] A method for improving the quality of ethylene glycol involved in the present invention is to use a metal catalyst to catalyze hydrogenation of trace organic impurities in ethylene glycol (mass fraction 10% to 100%) to improve the ultraviolet light transmittance of ethylene glycol, Reduce aldehyde content, thereby improving the quality of ethylene glycol. Background technique [0002] Ethylene reacts with oxygen under the action of a silver catalyst to form ethylene oxide. After being absorbed by water, decomposed and absorbed again, ethylene oxide enters the hydration reactor to react to form ethylene glycol and polyethylene glycol. The reaction solution is concentrated by multi-effect evaporation , Rectification and dehydration, rectification and steaming ethylene glycol and polyethylene glycol and other separation processes to obtain ethylene glycol products. The ethylene glycol products produced by this process can reach a purity of more than 99.9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/90
Inventor 陈群何明阳张益峰朱晔曹玉霞
Owner JIANGSU POLYTECHNIC UNIVERSITY
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