Bimetallic salt catalyst system and its uses

A bimetallic salt and catalyst technology, applied in the catalyst system and its application field, can solve the problems of active component loss, low EG selectivity, high pressure two-step method, etc., achieve less industrial waste water, high activity, and low production cost Effect

Inactive Publication Date: 2008-11-05
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is in order to solve the catalyst existing in the prior art resin swelling, loss of active components, poisonous catalyst or must be in the presence of CO 2 Under the conditions of reaction, high pressure, relatively complicated two-step process and low selectivity of EG, it provides a high reactivity and high-reactivity method that makes ethylene oxide react directly with water in one step to generate monoethylene glycol. Bimetallic salt catalyst system with high monoethylene glycol selectivity and low water ratio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 400 grams of water, 30 grams of sodium carbonate, and 0.6 grams of lanthanum oxide were added to a 1000 milliliter titanium autoclave, and 100 grams of ethylene oxide was measured by an electronic balance through N 2 or CO 2 Press into the above autoclave, electric heating controls the reaction temperature to be 120°C, the reaction pressure is 1.0MPa, the reaction time is 20 minutes, and the reaction is stopped. After the reaction liquid is cooled, the conversion rate of ethylene oxide is 100%. Alcohol selectivity was 99.08%.

Embodiment 2

[0023] 400 grams of water, 30 grams of potassium bromide, and 0.6 grams of cerium oxide were added to a 1000 ml titanium autoclave, and 100 grams of ethylene oxide was measured by an electronic balance through N 2 or CO 2 Press into the above autoclave, electric heating controls the reaction temperature to be 120°C, the reaction pressure is 1.0MPa, the reaction time is 20 minutes, and the reaction is stopped. After the reaction liquid is cooled, the conversion rate of ethylene oxide is 100%. Alcohol selectivity was 99.28%.

Embodiment 3

[0027]Weigh 300 grams of catalyst potassium carbonate and 6 grams of cocatalyst lanthanum oxide, dissolve them in 4000 grams of water, place the prepared catalyst aqueous solution and the metering container on an electronic scale, and place the steel cylinder containing ethylene oxide on another electronic scale. First, use two metering pumps to continuously feed the catalyst aqueous solution and ethylene oxide to the tubular reactor of ￠25×3×600. The tubular reactor is placed in an electric heating furnace, and the reaction temperature is controlled at 100-120°C , the reaction pressure is 1.0MPa, the feed rate of adjusting the metering pump to control the catalyst aqueous solution is 1.28Kg / hr, and the feed rate of ethylene oxide is 0.32Kg / hr, that is, the feed molar ratio of water and oxyethane is 10:1, the reaction solution is decompressed by a pressure reducing valve and then cooled with cooling water. The conversion rate of ethylene oxide is 100% according to sampling anal...

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Abstract

The bimetal salt catalyst system consists of bimetal salt catalyst NM and NM dissolving solvent NS, and has the general expression of NM[NY(I) +MO(II)]+NS(III), where, NM is bimetal salt catalyst, N is one or several of IA, IIA, IB and IIB metals, Y is one or several of halogen, (bi)carbonate radical, (bi)sulfate radical and (bi)phosphate radical, M in MO is one or several of RE metal ions, O is oxygen, carbonate radical and nitrate radical, and NS is organic solvent or water and possesses boiling point of bimetal salt catalyst NM solution higher than 190 deg.c. The bimetal salt catalyst system has high activity, high selectivity and good circular use performance.

Description

technical field [0001] The invention relates to a catalyst system and its application, more specifically to a double metal salt catalyst system for preparing monoethylene glycol by a hydration method and its application. Background technique [0002] Monoethylene glycol (Monoethylene Glycol, referred to as MEG), also known as glycol, or ethylene glycol, is an important organic chemical raw material, since it was discovered that it reacts with terephthalic acid (PTA) to form polyethylene terephthalic acid After ethylene glycol can be used as a raw material for polyester fibers and polyester plastics, the amount of monoethylene glycol increases rapidly. The synthesis method of monoethylene glycol is generally ethylene oxide direct hydration method and catalytic hydration method. At present, the direct hydration method used in industrial production of monoethylene glycol uses a molar ratio of water to ethylene oxide (abbreviated as water ratio) of 22 ~25:1 raw material, the to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J23/02B01J23/06B01J21/10C07C29/10C07C31/20
Inventor 刘晓勤刘定华戴厚良马正飞姚虎卿
Owner NANJING TECH UNIV
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