A kind of refining method of n-hexanal

A refining method and technology of n-hexanal, applied in the separation/purification of carbonyl compounds, organic chemistry, etc., can solve the problems of inability to effectively separate hexanal products, improve utilization value, reduce self-condensation side reactions, and mild reaction conditions Effect

Active Publication Date: 2017-03-08
杭州昌德实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main components in light oil are epoxycyclohexane (boiling point 128°C), C5-C8 linear saturated ketones and hexanal (boiling point 130°C). Aldehydes and n-pentanol can form binary or multicomponent azeotropes, and conventional distillation cannot effectively separate 99% of hexanal products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Light oil from Yueyang Changde Chemical Industry Co., Ltd. (hexanal content 4.5% by mass, cyclohexane epoxy content 32.8% by mass, n-amyl alcohol 45.5% by mass, water 1% by mass) in a mass ratio of 0.5:1 Under the action of the condensation catalyst of fluoboric acid and water, aldol condensation reaction occurs with ethanol at 60°C to generate n-hexanal ether compound, and the other components in the product are separated from n-hexanal ether by rectification, wherein the condensation catalyst The mass content is 0.1%, and the mass content of ethanol is 50 mass%. Then, under the action of a 0.04% by mass concentrated sulfuric acid catalyst, n-hexanal ether is mixed with water of 2 times the molar weight of n-hexanal ether, and hydrolyzed at 40°C to obtain a mixture of n-hexanal and ethanol, which is obtained by refining Aldehyde product A1, and recovery of ethanol, the relevant parameters of A1 are shown in Table 1.

Embodiment 2

[0040] Light oil (the same as in Example 1) was subjected to aldol condensation reaction with isobutanol at 10°C under the action of fluoroboric acid and diethyl ether condensation catalyst at a mass ratio of 0.3:1 to generate n-hexanal ether compound, and the Other components in the product were separated from n-hexanal ether, wherein the mass content of the condensation catalyst was 0.2 mass%, and the mass content of isobutanol was 60 mass%. Then, under the effect of 0.1 mass % concentrated sulfuric acid catalyst, n-hexanal ether is mixed with water of 4 times the molar weight of n-hexanal ether, at 10 DEG C, carry out hydrolysis reaction, obtain the mixture of n-hexanal and isobutanol, by The n-hexanal product A2 was obtained by refining, and isobutanol was recovered. The relevant parameters of A2 are shown in Table 1.

Embodiment 3

[0042]Light oil (the same as in Example 1) was reacted with methanol at 30° C. under the action of a fluoroboric acid aqueous solution condensation catalyst with a mass ratio of 0.5:1 (fluoroboric acid: water) to generate n-hexanal ether compound, and Other components in the product were separated from n-hexanal ether by rectification, wherein the mass content of the condensation catalyst was 8% by mass, and the mass content of methanol was 65% by mass. Then, under the action of 0.5% by mass phosphoric acid catalyst, n-hexanal ether is mixed with water of 5 times the molar weight of n-hexanal ether, and hydrolyzed at 90°C to obtain a mixture of n-hexanal and isobutanol, which is obtained by refining n-hexanal product A3, and recover methanol, the relevant parameters of A3 are shown in Table 1.

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Abstract

The present invention discloses a refining method for hexanal, characterized by comprising following steps of: providing to-be-refined light oil that contains hexanal; performing a aldol condensation reaction between the light oil that contains the hexanal and alcohol under the action of a condensation catalyst to obtain a mixture; rectifying the mixture to obtain a hexanal ether compound; and performing a hydrolysis reaction between the hexanal ether compound and water under the action of a hydrolysis catalyst to obtain hexanal and alcohol. The refining method for hexanal in the present invention is low in refining cost and mild in reaction condition, improves utilization value of light oil and can create considerable economic benefits.

Description

technical field [0001] The invention relates to a method for refining n-hexanal. Background technique [0002] N-hexanal can be used in the organic synthesis of plasticizers, rubbers, resins and pesticides, and can also be used as gas chromatography analysis reagents and allowed edible flavors. [0003] N-hexanal is mainly produced by the catalytic oxidation of n-hexanol. For common preparation methods, please refer to: [0004] 1. "Preparation of n-hexanal by catalytic oxidation of n-hexanol" - "Fine Petrochemical Industry" in January 2011: using air as the oxidant and supported copper oxide as the catalyst (magnesia as the cocatalyst and aluminum oxide as the carrier), At a reaction temperature of 260°C, normal pressure, liquid air velocity of 2.5h-1, and a reaction time of 3h, the reaction conversion rate is 69.9%, and the target product selectivity is 46.6%; [0005] 2. "Research on the Preparation of n-Hexanal by Oxidative Dehydrogenation of n-Hexanol" - "Molecular Ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/85C07C47/02
CPCC07C45/85C07C47/02
Inventor 罗小沅肖志强屈铠甲姜红军
Owner 杭州昌德实业有限公司
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