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A kind of preparation method of aliphatic dihydric alcohol

An aliphatic diol, hydration reaction technology, applied in the field of organic synthesis, can solve the problems of high reaction water ratio, low product selectivity, large energy consumption, etc., to simplify the process flow, reduce the reaction water ratio, save energy and The effect of water resources

Active Publication Date: 2022-04-19
WANHUA CHEM GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the present invention promotes the mixed mass transfer of epoxy compounds and water by using surfactants, and at the same time synergistically promotes the high-selectivity ring-opening hydration reaction performance of solid phosphoric acid catalysts for epoxy compounds, and prepares fats with high selectivity at low water ratios It mainly solves the shortcomings of high reaction water ratio, high energy consumption and low product selectivity in the previous technical solutions, and can be used in the industrial production of aliphatic diols

Method used

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  • A kind of preparation method of aliphatic dihydric alcohol
  • A kind of preparation method of aliphatic dihydric alcohol
  • A kind of preparation method of aliphatic dihydric alcohol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0035] In an autoclave with a capacity of 1000 milliliters and equipped with a stirrer, thermometer and pressure gauge, add a certain molar ratio of alkylene oxide and water, 0.1-1% organic acid surfactant and 5-20% organic acid surfactant based on the mass of alkylene oxide % solid phosphoric acid catalyst, filled with nitrogen to keep the pressure at 2-30bar (gauge pressure), raise the reaction temperature to 90-150°C, keep the rotating speed at 500 rpm, and react for 0.5-4 hours. After the reaction was finished, it was cooled to room temperature, and the reaction liquid was analyzed qualitatively and quantitatively by gas chromatography to calculate the conversion rate of alkylene oxide and the selectivity of dihydric alcohol products. The ratio of raw materials, reaction conditions and reaction results in the reaction process are shown in Table 1. The catalyst was recovered by filtration, washed with ethanol and water, and then vacuum-dried for use.

Embodiment 9-10

[0037] Loading 10g of solid phosphoric acid particles into a stainless steel fixed-bed reactor with an inner diameter of 8 mm and a length of 300 mm, mixing the raw material hexane with 2-10 times the molar amount of water and 0.1-1% mass of dodecanoic acid, Use a metering pump according to the liquid space velocity of 0.5-1h -1 Feed material, react under the conditions of reaction pressure 0.2-3MPa, hot spot temperature 90-150℃ to prepare hexanediol, use gas chromatography to conduct qualitative and quantitative analysis of the product, calculate the conversion rate of hexanediol and the selectivity of hexanediol, the reaction conditions And the results are shown in Table 1.

Embodiment 11

[0039] The fresh solid phosphoric acid catalyst is replaced by a reclaimed catalyst, and other reaction conditions are the same as in Example 1, and the reaction results are as follows.

[0040]

[0041]

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PUM

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Abstract

The invention discloses a method for preparing aliphatic dihydric alcohols. The aliphatic dihydric alcohols are prepared by using epoxy compounds as raw materials, long-chain organic acids as surfactants, and pressurized hydration under the catalysis of solid phosphoric acid. The method of the present invention promotes the mixed mass transfer of epoxy compounds and water by using surfactants, and at the same time synergistically promotes the high-selectivity ring-opening hydration reaction performance of solid phosphoric acid catalysts for epoxy compounds, and prepares fats with high selectivity at low water ratios The aliphatic dihydric alcohol mainly solves the defects of high reaction water ratio, high energy consumption and low product selectivity in the previous technical solutions, and can be used for industrial production of aliphatic dihydric alcohol.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a method for preparing aliphatic dihydric alcohols by catalytic hydration of epoxy compounds. Background technique [0002] Aliphatic dihydric alcohols, such as ethylene glycol, propylene glycol, hexylene glycol, etc. are important organic chemical raw materials, mainly used in the synthesis of polyester resins, antifreeze agents, cosmetics, photographic materials, lubricants, pharmaceutical intermediates and various fine chemicals etc. Conventional methods for the preparation of aliphatic dihydric alcohols, epoxides are widely used in industry, in the absence of catalysts or strong acid catalysts, such as sulfuric acid (S.A.Miller "Ethylene and its industrial derivatives" pages 588-594, Ernest Benn Co. Company 1969; Kirk-Othmer, Encyclopedia of Chemical Technology, Volume 11, Fourth Edition, page 700, 1994) in the presence of hydration reaction with water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/10C07C31/20
CPCC07C29/103C07C31/20
Inventor 王漭李俊平赵晶牟通
Owner WANHUA CHEM GRP CO LTD
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