Process for producing alkylidene dibasic alcohol

A technology of alkylene glycol and alkylene oxide, which is applied in the field of preparation of alkylene glycol, can solve the problems of short catalyst life, poor heat resistance, etc., achieve low conversion rate, good thermal stability, selectivity The effect of improving performance and yield

Active Publication Date: 2006-11-22
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

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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 monomer mixture solution (29.2 gram styrene, 5.8 gram divinylbenzene (40% by weight), 1.2 gram carbon nanotube, 35.6 gram 200 # Gasoline, 0.35 g of benzoyl peroxide), 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, add 8 grams of zinc chloride as a catalyst, and heat up to 39-40°C...

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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Abstract

The invention relates to a method for preparing alkylene glycol, and mainly solves the problems of short service life and poor heat resistance of the catalyst used in the prior art under the condition of high conversion rate and selectivity. The present invention uses alkylene oxide and water as raw materials, at a reaction temperature of 60 to 150°C, a reaction pressure of 0.5 to 2.0 MPa, a water / alkylene oxide molar ratio of 5 to 15:1, and a liquid space velocity of 3 to 10 MPa. 6 hours -1 Under conditions, the raw material is contacted with a macroporous composite resin catalyst to generate an alkylene glycol, wherein the macroporous composite resin catalyst includes monomers, comonomers, nanomaterials, initiators, and auxiliary agent one and auxiliary agent two components, and OH for macroporous composite resin - , Cl - 、HSO 4 - 、HCO 3 - or HCOO - The technical scheme of anion compound treatment solves this problem well, and can be used in the industrial production of ethylene oxide catalytic hydration to form dihydric 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 Patents(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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