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Process for producing alkylidene dibasic alcohol

A technology for alkylene glycol and alkylene oxide, which is applied in the field of preparing alkylene glycol by catalytic hydration of alkylene oxide, can solve the problems of short service life of catalyst, poor heat resistance, etc. The effect of good thermal stability, selectivity and yield improvement

Active Publication Date: 2006-11-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 method for preparing alkylene glycols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] Preparation method of composite resin

[0040] 【Example】

[0041] In a 250 ml three-neck bottle, add 120 ml of distilled water and 0.6 g of polyvinyl alcohol, start stirring and raise the temperature to completely dissolve the polyvinyl alcohol. Stop stirring, add the monomer mixture solution containing initiator (20.4 grams of styrene, 6.1 grams of divinylbenzene, 3.9 grams of carbon nanotubes, 1.4 grams of benzoyl peroxide) after cooling down slightly, start stirring, and heat up to 85 ° C. React for 5 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 ...

Embodiment 1～5

[0054] 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

[0058] 15 milliliters of the above-mentioned 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. material. 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 dihydric alcohols, and mainly solves the problems of short service life and poor heat resistance of catalysts used in the prior art under conditions 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 the conditions, the raw material is contacted with the composite resin catalyst to generate alkylene glycol, wherein the composite resin catalyst includes monomers, comonomers, nanomaterials, initiators and auxiliary components, and the composite resin uses OH - , 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 method for preparing alkylene glycols, in particular to a method for preparing alkylene glycols by 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, an excessive amount of ...

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 周斌何文军费泰康何立陈永福
Owner CHINA PETROLEUM & CHEM CORP
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