Catalyzer for liquid-phase catalytic oxidation producing of chlorobenzaldehyde by using p-chlorotoluene

A technology of p-chlorobenzaldehyde and liquid phase catalysis, which is applied in the direction of hydrocarbon oxidation to prepare oxygenates, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., which can solve the problem of long reaction time and conversion rate low, the catalyst cannot be reused, etc., to achieve the effect of low reaction temperature, high reaction yield, and simple catalyst separation

Inactive Publication Date: 2008-03-12
天津佰腾生产力促进中心有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is low cost and simple process; the disadvantage is that the reaction time is long, the catalyst cannot be reused, and the conversion rate is low.

Method used

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  • Catalyzer for liquid-phase catalytic oxidation producing of chlorobenzaldehyde by using p-chlorotoluene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: the evaluation of preparation and activity of catalyst A

[0030] 2.391g (0.0096mol) Co(OAc) 2 4H 2 O, 0.588g (0.0024mol) Mn(OAc) 2 4H 2 O and 0.714g (0.0060mol) KBr were dissolved in 50ml deionized water, heated and stirred to dissolve completely; 10.0g γ-Al 2 o 3 The carrier was poured into the above solution, evaporated to dryness at 65°C; then dried at 120°C for 3 hours, and calcined in a muffle furnace at 500°C for 3 hours. Get a catalyst.

[0031] Put 2.0g of catalyst in a 50ml three-necked flask, measure 10ml of p-chlorotoluene and 30ml of acetic acid into the three-necked flask with a pipette, and put them into a magnet; start stirring, condense and reflux (the upper end of the condenser tube is sealed with concentrated sulfuric acid liquid) ), heated to 110°C; kept at a constant temperature, fed oxygen (30ml / min), reacted for 6h, and cooled to room temperature after the reaction. Catalyst, p-chlorobenzoic acid and filtrate are separated by ...

Embodiment 2

[0032] Embodiment 2: catalyst is the same as A

[0033] Activity evaluation was the same as in Example 1 except that the reaction temperature was 100°C. The conversion rate of p-chlorotoluene is 36.6%, the selectivity of p-chlorobenzyl alcohol is 4.4%, the selectivity of p-chlorobenzaldehyde is 61.8%, the selectivity of p-chlorobenzoic acid is 33.8%, and the yield of p-chlorobenzaldehyde is 22.7%.

Embodiment 3

[0034] Embodiment 3: catalyst is the same as A

[0035] The activity evaluation was the same as in Example 1 except that the solvent acetic acid was 20 ml. The conversion rate of p-chlorotoluene is 43.7%, the selectivity of p-chlorobenzyl alcohol is 7.4%, the selectivity of p-chlorobenzaldehyde is 64.3%, the selectivity of p-chlorobenzoic acid is 28.3%, and the yield of p-chlorobenzaldehyde is 28.1%.

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Abstract

The present invention relates to a catalyst for preparation of p-chlorobenzaldehyde through liquid phase catalytic oxidation. The catalyst is a compound catalyst, which is formed by loading an element provided with catalytic activity on a carrier of aluminum oxide. Active componentS of the catalyst of the present invention are cobalt and manganese, which are loaded on the carrier of the aluminum oxide. The molar ratio of cobalt and manganese is 0.1-5. In addition, the active components of the present invention can also comprise nickel, copper, iron, cerium, lanthanum, magnesium or zirconium and bromine, besides cobalt and manganese. The catalyst of the present invention is applied the reaction course for preparation of p-chlorobenzaldehyde, and is characterized by the simple technique, the high p-chlorobenzaldehyde reaction yield ratio, the low reaction temperature, the simple catalyst separation, and so on.

Description

technical field [0001] The invention relates to a supported composite catalyst and its preparation method and application, specifically a supported composite catalyst supported on a carrier aluminum oxide, especially a kind of catalyst used for the liquid-phase catalytic oxidation of p-chlorotoluene to prepare para Catalyst for chlorobenzaldehyde. Background technique [0002] p-Chlorobenzaldehyde is a very important chemical intermediate, which has very important application value in medicine, pesticide and dyestuff. With the development of applications and the increase of market demand, the research on p-chlorobenzaldehyde has become a hot topic. In medicine, it is used in the manufacture of sedatives Fennarol, phenylbutyric acid, veterinary drug Chlorhexidine hydrochloride, etc.; in pesticides, it is used in the synthesis of uniconazole, paclobutrazol, chlorocinnamaldehyde and the herbicide Shadi San important intermediates, the synthesis of the new pyrrole insecticide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889C07C27/12C07C45/36C07C47/55
Inventor 马建泰张锋
Owner 天津佰腾生产力促进中心有限公司
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