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Aliphatic dihydroxy alcohol preparation method

An aliphatic dihydric alcohol and aliphatic technology, applied in the field of preparation of aliphatic dihydric alcohol, can solve the problems of high reaction water ratio, low product selectivity, high energy consumption, etc., achieve shortened process flow, and have no pollution to the environment , the effect of saving energy

Active Publication Date: 2006-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by this invention is to solve the high reaction water ratio (molar ratio of water and epoxide), the defects of high energy consumption and low product selectivity in the previous technical solutions, and provide a new aliphatic dibasic alcohol Preparation

Method used

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  • Aliphatic dihydroxy alcohol preparation method

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Experimental program
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Effect test

Embodiment 1

[0021] Fully mix 60 grams of aluminum hydroxide raw powder and 40 grams of silicon dioxide raw powder, then add 60 milliliters of 4% (weight) dilute nitric acid, fully knead in a kneader to form a doughy material, extrude it, and heat it at room temperature drying at 150° C. for 2 hours, and calcining at 1400° C. for 4 hours to obtain a strip-shaped carrier. The above-mentioned carrier is crushed to 40-60 meshes, and loaded into the upper section of the chemical vapor deposition reactor. The reactor is a quartz reaction tube with an inner diameter of 10 mm and a length of 300 mm. The reactor is divided into upper and lower sections, and a certain number of sintered glass is installed in the middle. The reactor is heated by external heating, and two parallel thermocouples are installed outside to control and measure the heating temperature of the upper and lower sections of the reactor respectively. The upper part of the reactor is used to load the catalyst carrier, and the l...

Embodiment 2

[0023] 10 g of anatase nanoscale TiO 2 , 90 grams of silicon oxide powder and 12 grams of niobic acid at 200 kg / cm 2 Tablet molding under pressure, calcination in air at 700°C for 4 hours to obtain catalyst B. The catalyst composition is shown in Table 1.

Embodiment 3

[0025] Fully mix 113 grams of aluminum hydroxide powder, 8 grams of graphite, and 7 grams of squash powder, then add 60 milliliters of 2% (weight) dilute nitric acid, fully knead in a kneader to form a lump material, and extrude , dried at room temperature for 24 hours, dried at 150°C for 2 hours, and calcined at 1300°C for 4 hours to obtain strip-shaped α-Al 2 o 3 carrier. Then impregnate the mixed solution of aluminum nitrate and magnesium nitrate into α-Al 2 o 3On the carrier, dry at 150°C for 2 hours, and bake at 1200°C for 4 hours to obtain 2% (weight) MgAl 2 o 4 / α-Al 2 o 3 carrier. Then commercially available niobium oxalate was dissolved in water to prepare a niobium oxalate solution, which was vacuum-impregnated onto the aforementioned carrier, dried at 150°C for 2 hours, and then calcined at 300°C for 4 hours under a carbon dioxide atmosphere to obtain catalyst C. The composition of the catalyst is shown in the table 1.

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Abstract

The invention relates to a preparation method for aliphatic diol to solve the shortcomings in prior art that has large water ratio and energy consumption and no select to product. Wherein, it comprises: with niobite oxide as catalyst, high-selected preparing objective product by the high-selectivity open-ring hydration reaction performance of the catalyst to epoxy ring on lower water mole ratio. This invention can reduce cost.

Description

technical field [0001] The present invention relates to a method for preparing aliphatic dihydric alcohols, in particular to a method for preparing aliphatic dihydric alcohols, such as ethylene glycol, 1,2-propylene glycol, 1,2-butanediol, etc., using niobium oxide as a catalyst . Background technique [0002] Aliphatic dihydric alcohols, such as ethylene glycol, propylene glycol, butylene glycol, etc., are widely used in industry. Conventional methods for the preparation of aliphatic diols, epoxides are widely used in industry, in the absence of catalysts or with acidic catalysts, such as mineral acids such as sulfuric acid [see S.A. Miller "Ethylene and its Industrial Derivatives" No. 588 - 594 pages (Ernest Benn Ltd. 1969), Kirk-Othmer, Encyclopedia of Chemical Technology, Volume 11, Fourth Edition, page 700, 1994] in the presence of hydration reaction with water. [0003] Relative to each mole of epoxide, the amount of water used in the...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/10
Inventor 李应成何文军何立杨为民费泰康
Owner CHINA PETROLEUM & CHEM CORP
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