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Novel technique for preparing ethylene glycol

A ethylene glycol and new process technology, applied in the new process field of ethylene glycol production, can solve the problems of flammability, increased energy consumption, shortage, etc., and achieve the advantages of reducing operating costs, simplifying process flow, and improving production efficiency. Effect

Inactive Publication Date: 2007-02-28
SHANDONG XIWANG SUGAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Early ethylene oxide was produced by chlorohydrin, but now this method has been replaced by direct oxidation, that is, in the presence of air or oxygen, ethylene is oxidized by a silver oxide catalyst, and then ethylene oxide Ethylene glycol is obtained by hydrolysis and fractionation. The selectivity of ethylene glycol in this process is low, and water that is 20 times the mole number of ethylene oxide is required to achieve 90% ethylene glycol yield, and the energy consumption during concentration is increased.
At the same time, the raw material ethylene oxide is a toxic carcinogen, flammable and explosive, and has a great impact on the human body and the environment. It is produced by direct or indirect oxidation of ethylene. The main raw material for ethylene production is naphtha , light diesel oil and other raw material resources, these raw materials come from the cracking of petroleum, and petroleum is a non-renewable resource, which is currently facing an increasingly serious shortage

Method used

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  • Novel technique for preparing ethylene glycol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: As shown in the attached figure, the preparation of glucose syrup with DX value: the cornstarch milk is subjected to liquefaction, saccharification, filtration, decolorization, separation and other processes and then enters the simulated moving bed chromatographic separation system for separation to obtain DX 99.5%. glucose syrup. The feed dry matter entering the chromatographic separation system is 60%, and the temperature is 60°C.

[0019] Hydrogenation reaction: Evaporate high DX value glucose syrup to 50% dry matter, use nickel as a catalyst, carry out hydrogenation reaction at 150°C, pH 8.2, and pressure 4.5Mpa to obtain 97% sorbitol solution.

[0020] Refining of sorbitol solution: the sorbitol solution after the hydrogenation reaction is cooled, settled, filtered, separated and decolorized, and evaporated to 50%.

[0021] Hydrogenolysis of sorbitol: under the conditions of pH 10, temperature 230°C and pressure 2500 psig, using Ni / Ru as catalyst, hydro...

Embodiment 2

[0023] Example 2: As shown in the accompanying drawings, the preparation of glucose syrup with DX value: the cornstarch milk is put into the simulated moving bed chromatographic separation system for separation after liquefaction, saccharification, filtration, decolorization, separation and other processes to obtain DX 99% Glucose syrup, wherein the feed dry matter entering the chromatographic separation system is 50%, and the temperature is 70°C.

[0024] Hydrogenation reaction: Evaporate high DX value glucose syrup to 50% dry matter, use nickel as a catalyst, carry out hydrogenation reaction at 140°C, pH 7.5, and pressure 3.5Mpa to obtain 96% sorbitol solution.

[0025] Refining of sorbitol solution: the sorbitol solution after the hydrogenation reaction is cooled, settled, filtered, separated and decolorized, and evaporated to 50%.

[0026] Hydrogenolysis of sorbitol: under the conditions of pH 9, temperature 190°C and pressure 2000 psig, using Co / Re as catalyst, hydrogenol...

Embodiment 3

[0028] Example 3: As shown in the attached figure, the preparation of glucose syrup with DX value: After the corn starch milk is liquefied, saccharified, filtered, decolorized, and separated, it is separated into a simulated moving bed chromatographic separation system to obtain DX 99.7%. glucose syrup. The feed dry matter entering the chromatographic separation system is 70%, and the temperature is 80°C.

[0029] Hydrogenation reaction: Evaporate high DX value glucose syrup to 50% dry matter, use nickel as a catalyst, carry out hydrogenation reaction at 160°C, pH 8.5, and pressure 5.5Mpa to obtain 98% sorbitol solution.

[0030] Refining of sorbitol solution: the sorbitol solution after the hydrogenation reaction is cooled, settled, filtered, separated and decolorized, and evaporated to 50%.

[0031] Hydrogenolysis of sorbitol: under the conditions of pH 11, temperature 250°C and pressure 4000 psig, using Ru as a catalyst, hydrogenolysis for 6 hrs to obtain a mixture of ethy...

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Abstract

The invention discloses a new technology to manufacture ethandiol, which is characterized by the following: liquefying starch emulsion; saccharifying; filtering; decolouring; separating through simulated mobile chromatogramic separating system; obtaining DX 99-99.7% glucose slurry; evaporating DX value glucose slurry to 50% as dried material; adopting ruthenium or nickel as catalyst; proceeding hydrogenation reaction to obtain the sorbitol solution; hydrogenolyzing for certain time under one catalyst of Ru, Ni / Ru and Co / Re to produce compound with ethandiol, glycerin and propanediol; cooling multi-alcohol; sedimenting; filtering; separating; decolouring; separating ethandiol, glycerin and propanediol.

Description

technical field [0001] The invention relates to a production process of chemical raw materials, in particular to a new process for producing ethylene glycol. Background technique [0002] We know that ethylene glycol is an important chemical raw material, mainly used to produce polyethylene terephthalate (PET), followed by antifreeze, and ethylene glycol is also used for heat transfer Medium and thawing agent, the market situation is considerable. [0003] Industrially, the only method currently available for the large-scale production of ethylene glycol is the hydrolysis of ethylene oxide. Early ethylene oxide was produced by chlorohydrin, but now this method has been replaced by direct oxidation, that is, in the presence of air or oxygen, ethylene is oxidized by a silver oxide catalyst, and then ethylene oxide Ethylene glycol is obtained by hydrolysis and fractionation. The selectivity of ethylene glycol in this process is low, and water that is 20 times the mole number ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/00
Inventor 王勇李伟阿纳斯孙宗宝崔立平许萍杨会敏何玉梅
Owner SHANDONG XIWANG SUGAR
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