Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing ethylene glycol by directly oxidizing ethylene

A technology of ethylene glycol and ethylene, which is applied in the field of preparing ethylene glycol, can solve problems such as catalyst loss, low ethylene glycol yield, and impact on product ethylene glycol quality, and achieve high selectivity, improved acidity, and reaction conditions mild effect

Inactive Publication Date: 2013-06-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] We use the catalyst prepared in the literature: Xi Z W, Zhou N, Sun Y, Li K L.Reaction-ControlledPhase-Transfer Catalysis for Propylene Epoxidation to PropyleneOxide[J].Science, 2001, 292: 1139, using hydrogen peroxide as the oxygen source to directly oxidize Ethylene is used to synthesize ethylene glycol in one step, but the research results show that the yield of ethylene glycol is not high due to the weak acidity of the reaction system, and the loss of the catalyst in the organic solvent also affects the product ethylene glycol. the quality of

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Catalyst Preparation: Reference Journal of Molecular Catalysis A, 2001, 166:219.

[0021] Weigh 2.50g of tungstic acid and add it to 10ml of 30% hydrogen peroxide, heat to 60°C while stirring, and obtain a colorless and transparent solution after 60 minutes. Add 0.29 g of phosphoric acid with a mass concentration of 85% to the solution, add 20 ml of distilled water and keep stirring for 30 min. Weigh 2.5g of cetyltrimethylammonium chloride and dissolve it in 40ml of dichloroethane, quickly drop this solution into the above-mentioned hydrogen peroxide solution, and keep stirring for 60min to obtain a precipitate. The precipitate was washed with distilled water until the pH of the filtrate was approximately equal to 4. The filtrate is vacuum-dried at 50-60° C. to obtain a quaternary ammonium salt catalyst of phosphotungstic heteropolyacid.

[0022] Ethylene oxidation hydration reaction: In a 250ml stainless steel reaction kettle with a glass liner, 50ml of 1-methylimida...

Embodiment 2

[0024] Referring to the process operation of Example 1, the difference from Example 1 is that the reaction temperature of Example 1 is changed from 60°C to 70°C. Analysis by gas chromatography showed that the yield of ethylene glycol to hydrogen peroxide was 90%.

Embodiment 3

[0026] Referring to the process operation of Example 1, the difference from Example 1 is that the 1-methylimidazole trifluoromethanesulfonate in Example 1 is replaced with 1-butylimidazole trifluoromethanesulfonate. Analysis by gas chromatography showed that the yield of ethylene glycol to hydrogen peroxide was 80%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for preparing ethylene glycol by directly oxidizing ethylene. According to the method, with phosphotungstic acid quaternary ammonium salt with the characteristic of reaction-controlled phase transfer as a catalyst and acidic ionic liquid as a solvent, ethylene is oxidized by using hydrogen peroxide to generate ethylene glycol under the conditions that the reaction temperature is 50-150 DEG C and the pressure is 0.6-6.0MPa. The method has the advantages of mild reaction conditions, high selectivity and catalyst recoverability.

Description

technical field [0001] The present invention relates to a method for preparing ethylene glycol. Background technique [0002] Ethylene Glycol, referred to as EG or MEG, is mainly used in the production of polyester, accounting for more than 80% of the total consumption. In addition, it can also be used in antifreeze, lubricants, plasticizers, surfactants, explosives, paints, It is an important basic petrochemical raw material for the production of adhesives, inks, photographic developer, hydraulic brake fluid, etc. At present, due to the rapid growth of the polyester industry in China, the consumption of ethylene glycol is increasing rapidly. In 2002, my country's apparent consumption of ethylene glycol exceeded 3 million tons, surpassing the United States to become the world's largest ethylene glycol consumer. [0003] The production technology of ethylene glycol mainly includes two categories: petrochemical route and synthesis gas route using natural gas (or coal) as raw...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/48
CPCY02P20/52Y02P20/54
Inventor 高爽李军张毅张恒耘吕迎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI