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Method for preparing tetraethylene-glycol

A technology for tetraethylene glycol and ethylene glycol, applied in the field of preparing tetraethylene glycol, can solve the problems of unsatisfactory product quality, low tetraethylene glycol product recovery rate, large dosage, etc., and achieves elimination of adverse effects, reduction of color and luster, and improvement of Effects of Recovery and Purity

Inactive Publication Date: 2003-09-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the defects of large amount of basic catalyst, low recovery rate of tetraethylene glycol product, unsatisfactory product quality, and no separation and treatment of catalyst and reaction material in the prior art, and provide a preparation The method of tetraethylene glycol, which has the characteristics of small amount of basic catalyst, high recovery rate of tetraethylene glycol product, good product quality, simple operation and easy implementation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 700 kg of diethylene glycol, 250 grams of catalyst potassium hydroxide, and 500 grams of calcium oxide to a pressure vessel with a volume of 1500 liters, equipped with an agitator and a built-in cooling coil. After the pressure vessel is sealed, replace the air in the vessel with nitrogen , maintain a pressure of 0.2MPa, raise the temperature to 120°C, add 340kg of liquid ethylene oxide dropwise, keep the reaction temperature at 130°C, and the pressure at 0.3MPa, until all the ethylene oxide required for the reaction is completely reacted, and the reaction material is cooled to 90°C, move it into the neutralization kettle, and then add 16.5 kg of acid clay (acid clay model 1020#, specification 190 mmol H + / kg) and 1.5 kilograms of diatomite (No. 08 diatomite model), stirred and reacted for 0.5 hour, and the acid clay and diatomite in the reaction mass were filtered and removed with a plate and frame filter, and obtained a pH value of 7.5, micro 1035.5 kg of yellow...

Embodiment 2

[0022] Tetraethylene glycol was prepared according to the reaction conditions in Example 1, except that the amount of acid clay was 11 kg, the amount of diatomaceous earth was 1.2 kg, and the treatment time was 1.5 hours. 1036.3 kg of reaction materials were obtained, which contained 48.2% of triethylene glycol and 29.6% of tetraethylene glycol through gas chromatography analysis.

Embodiment 3

[0024] Prepare tetraethylene glycol according to the reaction condition of embodiment 1, difference: the acid clay consumption is 22 kilograms (acid clay model 1040#, specification 180 millimolar H + / kg), diatomaceous earth consumption 1.8 kilograms. The obtained reaction material was 1035.1 kg, and analyzed by gas chromatography, which contained 48.5% of triethylene glycol and 29.3% of tetraethylene glycol.

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PUM

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Abstract

The present invention relates to a method for preparing tetraglycol. It utilizes the mixture formed from acidic clay and diatomite to pretreat the material obtained after synthetic reaction, the treatment temp. is 30-90 deg.C, treatment time is 0.1-4 hr., and the does of the acidic clay and diatomite is 0.5-5 of total weight of reaction material, in which the weight ratio of the acidic clay and diamite is 8-15:1 and the treated material is undergone the processes of separation and purification so as to obtain the invented product tetraglycol and its by-product triglycol.

Description

technical field [0001] The present invention relates to the method for preparing tetraethylene glycol. Background technique [0002] Tetraethylene glycol is a valuable chemical product, mainly used as an extraction solvent for aromatic hydrocarbons (benzene, toluene and xylene) from catalytic reforming of oil refineries and cracking of light tar, and can also be used for synthesis The raw material of tetraethylene glycol alkyl ethers and polyester resins, tetraethylene glycol belongs to a high-efficiency and energy-saving aromatics extraction agent in the aromatics extraction process in which glycols are used as extraction solvents. [0003] The preparation method of tetraethylene glycol generally uses ethylene oxide and diethylene glycol as reaction raw materials, and alkali metal hydroxides and other basic substances are used as catalysts. Under certain reaction temperature and pressure conditions, through stepwise addition reaction, the stru...

Claims

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Application Information

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IPC IPC(8): C07C31/24
Inventor 袁梅卿陈永福姚亚平
Owner CHINA PETROLEUM & CHEM CORP
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