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Process for the production of [gamma]-butyrolactone from 1,4-butanediol

A kind of butyrolactone, free technology, applied in the field of preparing γ-butyrolactone, can solve the problems of high catalyst preparation cost, low yield, short catalyst life, etc., to improve selectivity and yield, prolong catalyst life, reduce side effects The effect of product formation

Active Publication Date: 2010-12-22
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] With regard to the production of γ-butyrolactone by dehydrogenation of 1,4-butanediol, the present invention is concerned with solving the problems of copper-chromium catalysts, namely, the problems associated with the preparation and disposal of the catalyst caused by the use of heavy metals such as chromium. Environmental pollution, relatively high catalyst preparation cost and low yield, and those problems of copper-zinc catalysts, namely relatively short catalyst life and low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Copper nitrate (2.5 hydrate, 36.24 g), zinc nitrate (6 hydrate, 27.29 g), aluminum nitrate (9 hydrate, 16.68 g) and gallium nitrate (41.29 g) were dissolved in distilled water (300 mL) to prepare The metal precursor solution was drawn out, and the solution was then heated to 70°C. Sodium nitrate (105.99 g) was dissolved in distilled water (1 L) to prepare a precipitant solution, and then the solution was heated to 70°C. Distilled water (200 mL) was added to the round bottom flask and heated to 70°C after charging to a stirrer. The metal precursor solution was slowly added while maintaining the temperature of the solution at 70°C. After adding a sufficient amount of the precipitant solution so that the pH value is 7 to 7.5 with sufficient stirring using the stirrer, the stirring is further performed for at least 1 hour. The precipitate was filtered and washed at least 3 times with distilled water. After drying, sintering was carried out at 400° C. in an air atmosphere...

Embodiment 2

[0054] Copper nitrate (2.5 hydrate, 36.24 g), zinc nitrate (6 hydrate, 27.29 g), aluminum nitrate (9 hydrate, 16.68 g) and gallium nitrate (30.92 g) were dissolved in distilled water (300 mL) to prepare The metal precursor solution was then heated to 70°C. Sodium nitrate (105.99 g) was dissolved in distilled water (1 L) to prepare a precipitant solution, and then the solution was heated to 70°C. Distilled water (200 mL) was added to the round bottom flask and heated to 70°C after charging to a stirrer. The metal precursor solution was slowly added while maintaining the temperature of the solution at 70°C. After adding a sufficient amount of the precipitant solution so that the pH value is 7 to 7.5 with sufficient stirring using the stirrer, the stirring is further performed for at least 1 hour. The precipitate was filtered and washed at least 3 times with distilled water. After drying, sintering was carried out at 400° C. in an air atmosphere for at least 4 hours.

[0055]...

Embodiment 3

[0058] React in the same manner as in Example 1, except that the WHSV of butanediol is 3.0h -1 . Twenty hours after the start of the reaction, the conversion of butanediol was 88.5 mol%, the selectivity of γ-butyrolactone was 96.8 mol%, and the yield of γ-butyrolactone was 85.7 mol%.

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PUM

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Abstract

The invention provides a catalyst represented in a chemical formula CuaGabMcOx (1) using 1,4-butanediol to prepare [gamma]-butyrolactone, wherein M stands for one or more than one metal elements except Cu and Ga. The constitution of the elements referred hereby as a:b:c is 1:0.01-15:0-10 and x represents a chemical variable determined by the constitutional valences of the other elements. More technically, with the introduction of the catalyst represents by the chemical formula (1), the reaction takes place to dehydrogenize 1,4-butanediol in gaseous phase at temperatures ranging from 150 degrees to 300 degrees and under reaction pressures of from zero to 10kg / cm2G.

Description

technical field [0001] The present invention relates to a process for the preparation of gamma-butyrolactone (GBL) from 1,4-butanediol using a copper-gallium catalyst, and more particularly to a process using a novel copper-gallium catalyst with improved catalyst lifetime A method for producing γ-butyrolactone with high yield and low cost by dehydrogenating 1,4-butanediol. Background technique [0002] [gamma]-butyrolactone, which is used as an intermediate in the preparation of N-methyl-2-pyrrolidone (NMP), is known in many ways for its preparation by dehydrogenation of butanediol. Among them, the following four methods are commonly used. [0003] The first method is a method of dehydrogenating butanediol using an oxidizing agent such as oxygen in the presence of a catalyst comprising one or more metals selected from palladium (Pd), platinum (Pt) and silver (Ag), It is disclosed in Japanese Patent Application Publication No. 2-27349 and Japanese Patent Application Laid-Op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/825C07D307/33
CPCB01J23/08B01J23/72C07D305/12
Inventor 尹永植李诚浩吴承勋金希洙全钟琪李渊净
Owner SK INNOVATION CO LTD
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