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Preparing-1-pentanal from mixed solvent ion liquid of tetrafluorborate methyl buty I imidazole salt/water

A technology of methyl butyl imidazolium tetrafluoroborate and ionic liquid, which is applied in the field of organic compound preparation, can solve the problems of poor selectivity, shorten the reaction time, achieve recycling, and simple process

Inactive Publication Date: 2005-01-12
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method has poor selectivity, and the positive / isotropic ratio of the product is only 2 to 4.

Method used

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  • Preparing-1-pentanal from mixed solvent ion liquid of tetrafluorborate methyl buty I imidazole salt/water
  • Preparing-1-pentanal from mixed solvent ion liquid of tetrafluorborate methyl buty I imidazole salt/water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1.0g of rhodium trichloride, 220g of sodium m-triphenylphosphinetrisulfonate, 300g of tetrafluoroborate methylbutylimidazolium salt, 100g of water and 250g of 1-butene were put into the autoclave in sequence, and CO and H 2 The mixed gas with a volume ratio of 1:1 was subjected to a hydroformylation reaction at 60 atmospheres, 80°C and strong stirring for 30 hours, cooling, deflation, gravity settlement, and liquid separation to obtain the product with a yield of 98%. 1-pentanal content 92%. The separated ionic liquid / water catalytic system is recycled.

Embodiment 2

[0025] Put 1.0g of rhodium trichloride, 220g of sodium m-triphenylphosphinetrisulfonate, 300g of methylbutylimidazolium tetrafluoroborate, 100g of water and 250g of 1-butene into the autoclave in sequence, and introduce CO and H 2 The mixed gas with a volume ratio of 1:1 was subjected to hydroformylation reaction at 60 atmospheres, 80°C and strong stirring for 20 hours, cooling, deflation, gravity settlement, and liquid separation to obtain the product with a yield of 80%. 1-pentanal content 92%. The separated ionic liquid / water catalytic system is recycled.

Embodiment 3

[0027] 1.0 g of rhodium trichloride, 200 g of sodium m-triphenylphosphine trisulfonate, 300 g of tetrafluoroborate methylbutylimidazolium salt, 100 g of water and 250 g of 1-butene were put into the autoclave in sequence, and CO and H 2 The mixed gas with a volume ratio of 1:1 was subjected to hydroformylation reaction at 60 atmospheres, 80°C and strong stirring for 30 hours, cooling, deflation, gravity settlement, and liquid separation to obtain the product with a yield of 90%. 1-pentanal content 86%. The separated ionic liquid / water catalytic system is recycled.

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Abstract

Prepn. of 1-valeric aldehyde by hydro-formylation of 1-butylene, carbon monoxid and hydrogen, catalyzed by rhodium trichloride and sodium m-triphenylphosphine trisulfonate, in mixed water solution of [Bmin] BF4. Then, the product is obtd. by gravitational settling and liquid separation. This method has advantages of: high yield, high selectivity, good prodn. environment and simple producing process. The product can be used as intermediate of perfumery, 1-pentoric acid and other fine chemicals.

Description

technical field [0001] The present invention relates to a kind of tetrafluoroborate methyl butyl imidazolium salt ([Bmim]BF 4 ) / water mixed solvent, which relates to a method for preparing 1-pentanal in an ionic liquid tetrafluoroborate methylbutylimidazolium salt / water mixed solvent, belonging to the technical field of organic compound preparation. Background technique [0002] 1-Veraldehyde, also known as n-valeraldehyde, is a widely used chemical intermediate, especially in the fragrance manufacturing industry. At present, 1-pentanal is mostly produced by hydroformylation of 1-butene, expressed as: [0003] [0004] Because this reaction produces n-valeraldehyde and isovaleraldehyde at the same time, and the isomer of n-valeraldehyde, the economic value is relatively much smaller. Therefore, increasing the ratio of n-valeraldehyde in the product is one of the main improvement directions of this preparation technology. [0005] The hydroformylatio...

Claims

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Application Information

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IPC IPC(8): C07C45/49C07C45/50C07C47/02
Inventor 汤杰罗宇龚勇华何鸣元
Owner EAST CHINA NORMAL UNIV
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