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Process for producing alkylene glycol

A technology for alkylene glycol and alkylene oxide, applied in the field of preparing alkylene glycol, can solve the problems of poor heat resistance, short service life of catalyst, etc., achieve good thermal stability, reduced conversion rate, swelling small effect

Active Publication Date: 2006-01-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is the method for preparing alkylene glycol in the past. Under the condition of relatively high conversion rate and selectivity, the catalyst used has the problems of short service life and poor heat resistance. Novel process for the preparation of alkylene glycols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] Preparation method of composite resin

[0041] 【Example】

[0042] In a 500 ml three-necked bottle, add 200 ml of distilled water and 0.9 g of gelatin, start stirring and raise the temperature to completely dissolve the polyvinyl alcohol. Stop stirring, add the monomer mixture solution (29.2 gram styrenes, 5.8 gram divinylbenzene (weight content 40%) that contains initiator after cooling slightly, 1.2 gram carbon nanotubes, 35.6 gram 200# gasoline, 0.35 gram benzene peroxide formyl), start stirring, heat up to 85°C, and react for 4 hours. The temperature was raised to 95°C for about 2 hours. After the reaction, pour out the upper liquid, wash with 85°C hot water for several times, and then wash with cold water for several times, then filter, dry, and weigh to obtain composite beads. Functionalization of composite beads: Add 20.6 grams of composite beads A and 80 milliliters of chloromethyl ether into a 500-ml three-necked bottle, start stirring and heat up to 30°C, ad...

Embodiment 1～5

[0055] 15 milliliters of each of the above-mentioned catalysts A, B, C, D, and E (grain size 20-40 mesh) were packed in a stainless steel fixed-bed reactor with a diameter of 10 mm and a length of 350 mm respectively, and the raw material water and ethylene oxide Alkanes are fed with a metering pump at a molar ratio of 12:1. The pressure of the reaction system is 1.2 MPa, the reaction temperature is 90°C, and the liquid space velocity is 3 hours -1 , The product was qualitatively and quantitatively analyzed by HP5890 gas chromatography, and the results are listed in Table 1.

Embodiment 6

[0059] 15 milliliters of the catalyst C (particle size 20-40 mesh) is packed in a stainless steel fixed-bed reactor with a diameter of 10 mm and a length of 350 mm, and feed water and ethylene oxide with a metering pump at a molar ratio of 22:1. . The pressure of the reaction system is 1.2 MPa, the reaction temperature is 90°C, and the liquid space velocity is 6 hours -1 , The product was qualitatively and quantitatively analyzed by HP5890 gas chromatography, and the results are listed in Table 1.

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PUM

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Abstract

The present invention is preparation process of alkylene dyhydric alcohol, and aims at prolonging the service life of catalyst and raising its heat tolerance while maintaining its high conversion rate and selectivity. The technological scheme of the present invention is that the material including alkylene oxide and water in the molar ratio of 1 to 5-15 and macroporous composite resin catalyst are made to contact and react to produce alkylene dyhydric alcohol in the conditions of reaction temperature 60-150 deg.c, reaction pressure 0.5-2 MPa and liquid space velocity 3-6 / hr. The macroporous composite resin catalyst includes monomer, copolymerized monomer, nanometer material, initiator and two assistants and is treated with OH-, Cl-, HSO4-, CHO3- or HCOO- anionic compound. The present invention may be used in industrial production of ethylene oxide catalyzed synthesis of dyhydric alcohol.

Description

technical field [0001] The present invention relates to a process for the preparation of alkylene glycols, in particular to a process for the preparation of alkylene glycols by the catalytic hydration of alkylene oxides. Background technique [0002] Ethylene glycol and propylene glycol are important aliphatic diols, among which ethylene glycol is the most widely used, mainly for the production of polyester resins, including fibers, films and engineering plastics. It can also be directly used as coolant and antifreeze, and it is also an indispensable substance in the production of alkyd resins, plasticizers, paints, adhesives, surfactants, explosives and capacitor electrolytes. [0003] Among the ethylene glycol compounds, diethylene glycol, triethylene glycol or higher polyethylene glycol have a narrower range of application than ethylene glycol. Therefore, in order to improve the selectivity of converting ethylene oxide into ethylene glycol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/20C07C29/10
CPCY02P20/52
Inventor 周斌李应成宗弘元王嘉华何立金照生
Owner CHINA PETROLEUM & CHEM CORP
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