Catalyst for producing methyl cyclohexanecarboxylate and application thereof

A technology of methyl cyclohexyl carboxylate and methyl benzoate, which is applied in the field of catalysts and their preparation, can solve the problems of complex separation of products and catalysts, easily broken activated carbon, and many post-treatment procedures, so as to improve the ability to resist CO poisoning , improve the conversion rate and simplify the separation process

Inactive Publication Date: 2009-12-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under these reaction conditions, benzoic acid and cyclohexyl formic acid are highly corrosive, and the device must be made of corrosion-resistant alloy steel; when stirred in a kettle reaction, the activated carbon is easily broken, resulting in the loss of metal palladium and high catalyst consumption; the product and catalyst Separation is complicated, and there are many post-processing procedures for products

Method used

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  • Catalyst for producing methyl cyclohexanecarboxylate and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 0.7 g of Mg(NO 3 ) 2 4H 2 O, dissolved in 24 milliliters of water, impregnated with this aqueous solution weighed 25 grams of aluminum oxide (average particle size is 40 mesh, specific surface area 180m 2 / g). Dry at 110°C and decompose by roasting at 500°C for 5 hours. Take 4 mL of PdCl 2 Mix hydrochloric acid aqueous solution (0.127g Pd / ml) and 20 milliliters of water, impregnate the above-mentioned roasted catalyst intermediate, dry naturally, dry at 120°C, roast at 450°C, and reduce in hydrogen flow at 280°C for 2 hours.

Embodiment 2

[0022] Weigh 0.7 g of Ca(NO 3 ) 2 4H 2 O, dissolved in 24 ml of water, impregnated with this aqueous solution weighed 35 grams of aluminum oxide (average particle size is 40 mesh, specific surface area 180m 2 / g). Dry at 110°C and decompose by roasting at 500°C for 5 hours. Take 4 mL of PdCl 2 Mix hydrochloric acid aqueous solution (0.127g Pd / ml) and 20 milliliters of water, impregnate the above-mentioned roasted catalyst intermediate, dry naturally, dry at 120°C, roast at 450°C, and reduce in hydrogen flow at 280°C for 2 hours.

Embodiment 3

[0024] Weigh 0.7 g of Ca(NO 3 ) 2 4H 2 O, dissolved in 24 milliliters of water, impregnated with this aqueous solution weighed 25 grams of aluminum oxide (average particle size is 40 mesh, specific surface area 180m 2 / g). Dry at 110°C and decompose by roasting at 500°C for 5 hours. Take 1 mL of PdCl 2 Aqueous solution (0.127g Pd / ml) plus 2ml RuCl 2 Aqueous solution (0.013g Ru / ml) was added to 18ml of water to make a mixed solution. Then, impregnate the above calcined catalyst intermediate with this mixed solution, dry, calcinate at 450°C, and reduce in hydrogen flow at 280°C for 1 hour.

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Abstract

The invention discloses a catalyst for producing methyl cyclohexanecarboxylate, which consists of three parts, namely a main active component, an additive and a carrier. The main active component is metal palladium. The additive is formed by combining first additive elements and second additive elements, an additive 1 is VIII metal elements, and an additive 2 is elements such as Ca, Mg, Si, B and the like; and the carrier is activated alumina. The catalyst is used for producing the methyl cyclohexanecarboxylate through the hydrogenation of methyl benzoate; and the adding of the two additives into the catalyst improves the ability of the catalyst against CO poisoning and improves catalytic performance. The corrosion problem during the production of the methyl cyclohexanecarboxylate is eliminated, the consumption of the catalyst is reduced, and the separation process of a product and the catalyst is simplified.

Description

technical field [0001] The invention relates to methyl cyclohexyl formate, in particular to a catalyst for hydrogenating methyl benzoate to produce methyl cyclohexyl formate and a preparation method thereof. Background technique [0002] Methyl cyclohexyl carboxylate is used to produce cyclohexyl formic acid, and cyclohexyl formic acid is an intermediate in the production of caprolactam, and the market demand is huge. Caprolactam undergoes a polymerization reaction when heated, and is a basic organic chemical raw material for the production of polycaprolactam fibers and polycaprolactam engineering plastics. Among them, polycaprolactam fibers are widely used in wool spinning, knitting, weaving, cord fabrics, carpets and other industries. Polycaprolactam engineering plastics Plastics are widely used in electronics, automotive industry, packaging film and other industries. With the development of new technologies and the expansion of market demand, the scope of application of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/58C07C67/303C07C69/75
Inventor 高进徐杰孙志强苗虹于维强
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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