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Method for preparing iso-butyl aldehyde by using isobutene or tert-butyl alcohol as raw material

A technology for isobutene and isobutyraldehyde is applied in the field of preparing isobutyraldehyde, can solve the problems of low space-time yield, low production cost, poor catalyst selectivity, etc., and achieves high space-time yield, high reaction conversion rate and high product selectivity. Effect

Active Publication Date: 2008-09-10
SHANGHAI HUAYI NEW MATERIAL
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  • Abstract
  • Description
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Problems solved by technology

[0028] The present invention provides a brand-new method (wherein, isobutylene originates from refinery or ethylene plant by-product mixed C 4 , or obtained by isobutane dehydrogenation in oilfield associated gas), the production cost of isobutyraldehyde is lower than the existing industrialized propylene oxo synthesis isobutyraldehyde route, which is a new and more competitive process route; the present invention It also provides a high-efficiency catalyst for preparing isobutyraldehyde by hydrogenation of methacrolein, which overcomes the problems of poor catalyst selectivity, poor stability, and low space-time yield in the method for synthesizing saturated aldehydes with unsaturated aldehydes as raw materials reported in the above patents. shortcoming

Method used

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  • Method for preparing iso-butyl aldehyde by using isobutene or tert-butyl alcohol as raw material

Examples

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Effect test

Embodiment 1

[0042] After the mixture of isobutene, water vapor and air is preheated, it is passed through the catalyst 80 (Mo 12 Bi 1.8 Fe 2.0 co 7.0 Sb 0.3 Pb 0.2 Yb 0.1 W 0.5 Ce 0.5 ) / 20TiO 2 In a fixed bed reactor, at 370°C, normal pressure, O 2 The molar ratio of water vapor to isobutene is 2, the molar ratio of water vapor to isobutene is 4, and the total space velocity of raw material mixture is 890h -1 The selective oxidation reaction is carried out under the conditions, the conversion rate of isobutene is 95.9%, and the selectivity of methacrolein is 87.6%.

[0043] The obtained methacrolein is separated and purified, and diluted with isobutanol until the mass concentration of methacrolein is 60%, and after preheating with hydrogen, the catalyst Ru-Sn / γ-Al 2 o 3 fixed bed reactor, at a reaction temperature of 50°C, a pressure of 1.0MPa, and a mass space velocity of methacrolein of 2.0h -1 、H 2The hydrogenation reaction is carried out under the condition that the molar...

Embodiment 2

[0045] After the mixture of tert-butanol, water vapor and air is preheated, it is passed through the catalyst 80 (Mo 12 Bi 1.8 Fe 2.0 co 7.0 Sb 0.3 Pb 0.2 Yb 0.1 W 0.5 Ce 0.5 ) / 20TiO 2 fixed-bed reactor, at 450°C, normal pressure, O 2 The molar ratio of water vapor to isobutene is 6, the molar ratio of water vapor to isobutene is 6, and the total space velocity of raw material mixture is 2000h -1 The selective oxidation reaction is carried out under the conditions, the conversion rate of isobutene is 96.1%, and the selectivity of methacrolein is 84.2%.

[0046] The obtained methacrolein is separated and purified, and diluted with isobutanol until the mass concentration of methacrolein is 80%, and after preheating with hydrogen, the catalyst Ru-Fe / γ-Al 2 o 3 fixed bed reactor, at a reaction temperature of 50°C, a pressure of 0.5MPa, and a mass space velocity of methacrolein of 3.0h -1 、H 2 The hydrogenation reaction is carried out under the condition that the molar...

Embodiment 3

[0048] After the mixture of isobutene, water vapor and air is preheated, it is passed through the catalyst 80 (Mo 12 Bi 1.8 Fe 2.0 co 7.0 Sb 0.3 Pb 0.2 Yb 0.1 W 0.5 Ce 0.5 ) / 20TiO 2 fixed-bed reactor, at 460°C, normal pressure, O 2 The molar ratio of water vapor to isobutene is 6, the molar ratio of water vapor to isobutene is 7, and the total space velocity of raw material mixture is 2400h -1 The selective oxidation reaction is carried out under the conditions, the conversion rate of isobutene is 95.9%, and the selectivity of methacrolein is 86.2%.

[0049] Separation and purification of the obtained methacrolein to a mass content of 98%, after preheating with hydrogen, passing through the catalyst Ru-Co / γ-Al 2 o 3 fixed bed reactor, at a reaction temperature of 40°C, a pressure of 0.5MPa, and a methacrolein mass space velocity of 7.6h -1 、H 2 The hydrogenation reaction is carried out under the condition that the molar ratio of methacrolein is 8, the conversion r...

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Abstract

The invention aims to provide a method of using isobutylene or tert-butyl alcohol as raw material to prepare isobutyraldehyde. The method prepares isobutyraldehyde through two steps as follows: (1) under the action of molybdenum-bismuth base composite oxide catalyst, isobutylene or tert-butyl alcohol selects oxidation to prepare methacrolein; (2) under the action of supported hydrogenation catalyst, methacrolein selects hydrogenation to prepare isobutyraldehyde. The raw material in the method is cheap and easy to get, which breaks the dependence of the prior isobutyraldehyde production on expensive C3 propylene raw material and opens up a brand new process route for preparing isobutyraldehyde through C4 raw material low in chemical utilization ratio. The method is high in the yield coefficient of isobutyraldehyde, simple in process, low in production cost and convenient for mass production.

Description

technical field [0001] The invention relates to a method for preparing isobutyraldehyde by using isobutene or tert-butanol as a raw material, specifically isobutene or tert-butanol to prepare isobutyraldehyde through the following two-step reaction process route and method: (1) isobutene or tert-butanol Selective catalytic oxidation of butanol to produce methacrolein; (2) Selective catalytic hydrogenation of methacrolein to produce isobutyraldehyde. Background technique [0002] Isobutyraldehyde is an important organic chemical raw material, which can produce dozens of high value-added downstream derivative products, and these products contain huge market potential in many fields. For example, isobutyraldehyde and urea undergo condensation reaction in the presence of an acid catalyst to obtain isobutylene diurea, which is a kind of organic slow-release control fertilizer with good performance; The main raw material of high-efficiency and low-toxic organophosphorus pesticide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C47/02C07C45/62
Inventor 张春雷罗鸽王剑施凯敏邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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