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Method for producing ethylene glycol through hydrolysis of EC (ethylene carbonate)

A technology of ethylene carbonate and ethylene glycol, which is applied in the field of ethylene glycol hydrolysis to produce ethylene glycol, which can solve the problems of easy loss of active components and poor catalyst stability, and achieve the effects of stable properties, poor solution stability and suitable acidity

Active Publication Date: 2018-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology improves upon how well an oxynitride compound works when exposed to high temperatures or strong acids compared to other materials like zeolite. It also enhances its thermal properties while maintains their chemical structure even after repeated use over time without losing any significant amount of them.

Problems solved by technology

This patents discusses different types of processes involved in producing certain products from alcoholysis reactions involving reacting carboxylic acids like acetic acid and olefms together at specific points within each molecule's structure called cycle steps. These methods involve either directly adding liquid bases containing lithiums or other metals onto starting materials beforehand, followed by heat treatment/distillage to separate desired components out. Additionally, some research groups focus on developing new catalysics based upon strong base ion exchangers instead of current ones.

Method used

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  • Method for producing ethylene glycol through hydrolysis of EC (ethylene carbonate)
  • Method for producing ethylene glycol through hydrolysis of EC (ethylene carbonate)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of silica-alumina gel SA1: Dissolve 22.1g of aluminum nitrate in 200ml of absolute ethanol at room temperature, stir for 20min, and dissolve it to obtain solution A1; dissolve 58.9g of tetraethyl orthosilicate in 200ml of absolute ethanol, add After stirring 200ml of deionized water and 5ml of concentrated nitric acid for 20 minutes, the prehydrolyzed mixture B1 was obtained; the solution A1 was poured into the mixture B1, and after stirring at room temperature for 1 hour, concentrated ammonia water was added dropwise until the pH value was 8. Then stand and age at 60°C for 12h, filter, wash the precipitate 3 times with absolute ethanol, and put it in an oven at 120°C overnight to obtain silica-alumina gel SA1, which was determined by ICP-AES, Al 2 o 3 The mass percentage content is 14.9%.

Embodiment 2

[0019] Preparation of silica-alumina gel SA2: Dissolve 7.3g of aluminum nitrate in 200ml of anhydrous methanol at room temperature, stir for 20min, and dissolve it to obtain solution A2; dissolve 65.9g of tetraethyl orthosilicate in 200ml of anhydrous methanol, add After stirring 200ml of deionized water and 5ml of concentrated nitric acid for 20 minutes, the prehydrolyzed mixture B2 was obtained; the solution A2 was poured into the mixture B2, and after stirring at room temperature for 1 hour, concentrated ammonia water was added dropwise until the pH value was 8. Then stand and age at 80°C for 20h, filter, wash the precipitate with anhydrous methanol for 3 times, and put it in an oven at 120°C overnight to obtain silica-alumina gel SA2, which was determined by ICP-AES. 2 o 3 The mass percentage content is 5.1%.

Embodiment 3

[0021] Preparation of silica-alumina gel SA3: The preparation steps are the same as in [Example 1], except that the amounts of aluminum nitrate and tetraethyl orthosilicate used are 36.8 g and 52.0 g respectively, to obtain silica-alumina gel SA3, which is measured by ICP-AES, and the Al 2 o 3 The mass percentage content is 24.8%.

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Abstract

The invention relates to a method for producing ethylene glycol through hydrolysis of EC (ethylene carbonate) and mainly solves the problems that a catalyst is poor in stability and active componentsare prone to losing in the prior art. The problem is better solved by means of the technical scheme as follows: the method comprises the step that EC and water are contacted with the catalyst under the reaction condition, wherein the catalyst is prepared from components in parts by weight as follows: a) 1-50 parts of niobium pentoxide and b) 50-99 parts of alumino silica gel carriers SiO2-Al2O3, and the silica gel carriers comprise 5-50 parts by weight of Al2O3 and 50-95 parts by weight of SiO2. The method can be applied to industrial production for preparation of ethylene glycol through hydrolysis of EC.

Description

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Claims

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Application Information

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Owner CHINA PETROLEUM & CHEM CORP
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