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Method for preparing benzaldehyde and benzyl alcohol

A technology for benzyl alcohol and benzaldehyde, applied in the field of preparation of benzaldehyde and benzyl alcohol, can solve problems such as separation difficulty and benzene, etc., and achieve the effects of improving selectivity, reducing emissions, and improving atomic utilization.

Active Publication Date: 2018-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of benzene, toluene and benzyl ether in the product obtained in the above-mentioned patent application is relatively high, and it is difficult to separate in the later stage

Method used

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Examples

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Effect test

preparation example Construction

[0025] The present invention also provides a method for preparing the aforementioned bifunctional catalyst, the method comprising: contacting a water-soluble metal salt solution with an excess alkaline precipitant solution to obtain a precipitation slurry, followed by aging, solid-liquid separation, washing, drying and roasting .

[0026] In the preparation method of the bifunctional catalyst of the present invention, preferably, the water-soluble metal salts include manganese salts, zinc salts and aluminum salts, and at least one of iron salts and molybdenum salts; further preferably, the water-soluble metal salts also At least one of zirconium salts, copper salts, cobalt salts, lanthanum salts and cerium salts is included.

[0027] Preferably, manganese salts, zinc salts, aluminum salts, copper salts, cobalt salts, iron salts, lanthanum salts and cerium salts are at least one of nitrates, acetates, sulfates and phosphates of the corresponding metals, zirconium salts Zirconi...

Embodiment

[0042] The present invention will be described in detail through examples below. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, but not to limit the present invention. In the following examples and comparative examples, unless otherwise specified, all reagents are commercially available and all are analytically pure, and all methods are conventional methods in the art.

[0043] The calculation formula of benzoic acid ester conversion rate is: benzoic acid ester conversion rate %=(the quality of the benzoic acid ester in the feed-the quality of the unreacted benzoic acid ester in the product) / the benzoic acid ester in the feed The mass of acid ester × 100%.

[0044] The formula for calculating the selectivity of benzaldehyde is: selectivity % of benzaldehyde=mass of benzaldehyde produced by reaction / total mass of each product produced by reaction×100%.

[0045] The formula for calculating the ...

preparation example 1

[0050] Prepare a composite metal oxide catalyst containing five metal elements of manganese-zinc-aluminum-molybdenum-iron, wherein, in terms of feed ratio, based on the total weight of manganese oxide, zinc oxide and aluminum oxide, MnO 2 The manganese oxide content is 44.86% by weight, the zinc oxide content is 41.99% by weight as ZnO, and the Al 2 o 3 The aluminum oxide content is 13.15% by weight, based on Fe 2 o 3 The content of iron oxide in terms of 1%, as MoO 2 The content of molybdenum oxide is 5% by weight, as MnO 2 Manganese oxide in terms of ZnO, zinc oxide in terms of ZnO, Al 2 o 3 The weight ratio of aluminum oxide is 1:0.94:0.3 to Fe 2 o 3 Iron oxide in terms of and MoO 2 The weight ratio of molybdenum oxide is 1:5.

[0051] Adopt coprecipitation method, its preparation steps are as follows: (1) weigh manganese nitrate aqueous solution (mass fraction is 50%) 55.40g, zinc nitrate hexahydrate 46.05g, aluminum nitrate nonahydrate 29.03g, ferric nitrate nona...

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Abstract

The invention relates to the technical field of preparation of benzaldehyde and benzyl alcohol, and discloses a method for preparing benzaldehyde and benzyl alcohol. The method comprises the followingsteps: a mixed solution containing benzoate and tetrahydronaphthalene is allowed to react under the presence of a bifunctional catalyst, and a reaction product is subjected to distillation separation, wherein the bifunctional catalyst comprises manganese oxide, zinc oxide, aluminum oxide, and iron oxide and / or molybdenum oxide; and based on a standard of the total weight of the manganese oxide, the zinc oxide and the aluminum oxide, the content of the manganese oxide in terms of MnO2, the zinc oxide in terms of ZnO, and the aluminum oxide in terms of Al2O3 is 15-56% by weight, 15-55% by weight, and 5-40% by weight respectively, and the sum of the content of the iron oxide in terms of Fe2O3 and the molybdenum oxide in terms of MoO2 is 1-10% by weight. The method can improve the conversionrate of the benzoate and the selectivity of benzaldehyde and benzyl alcohol, so as to produce benzaldehyde and benzyl alcohol with a high selectivity.

Description

technical field [0001] The invention relates to the technical field of preparation of benzaldehyde and benzyl alcohol, in particular to a method for preparing benzaldehyde and benzyl alcohol. Background technique [0002] Aromatic aldehydes represented by benzaldehyde are an important class of organic chemical products and reaction intermediates, and are widely used in the synthesis of spices, medicines, plastic additives, and resin additives. [0003] Traditional preparation methods of aromatic aldehydes include toluene halogenation, benzoylation and oxidation. The toluene halogenation method is to replace excess halogen with toluene or toluene with other branched chains, and then hydrolyze to obtain a mixture of benzaldehyde, benzyl alcohol and benzoic acid. The product contains chlorine that is harmful to the human body; in addition, benzene and carbon monoxide, The formylation reaction of raw materials such as hydrogen directly produces benzaldehyde, but the reaction co...

Claims

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Application Information

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IPC IPC(8): C07C45/41C07C47/54C07C29/149C07C33/22B01J23/889B01J23/34
CPCB01J23/002B01J23/34B01J23/8892B01J23/8898B01J2523/00C07C29/149C07C45/41C07C47/54C07C33/22B01J2523/27B01J2523/31B01J2523/68B01J2523/72B01J2523/842B01J2523/48B01J2523/3706B01J2523/845B01J2523/3712B01J2523/17
Inventor 郜亮温朗友俞芳夏玥穜董明会慕旭宏宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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