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Caprolactam hydrofining catalyst and method

A caprolactam and hydrorefining technology, applied to the separation/purification of lactam, Raney-type catalysts, chemical instruments and methods, etc., can solve the problems of low precision of hydrorefining, and achieve obvious impurity removal effect and good application prospect. , the preparation method is simple

Active Publication Date: 2016-11-23
SHANGHAI XUNKAI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing hydrofining precision of caprolactam in a fixed bed reactor is often low and cannot meet the higher precision requirements.

Method used

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  • Caprolactam hydrofining catalyst and method
  • Caprolactam hydrofining catalyst and method
  • Caprolactam hydrofining catalyst and method

Examples

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preparation example Construction

[0051] S1. Preparation of metal alloy particles;

[0052] S2. Using lye to activate the metal alloy particles;

[0053] S3. Washing the activated metal alloy particles with deionized water to obtain a granular Raney nickel catalyst;

[0054] S4. Using the granular Raney nickel catalyst in a fixed-bed reactor to perform hydrofining reaction on caprolactam.

[0055] Among them, S1-S3 are the preparation process of the granular Raney nickel catalyst. The specific implementation method can refer to the description of the caprolactam hydrogenation catalyst, so it will not be repeated here.

[0056] S4 is specifically: placing the granular Raney nickel catalyst in a fixed-bed reactor, purging with nitrogen, and co-flowing the caprolactam aqueous solution and hydrogen into the fixed-bed reactor for gas-liquid-solid three-phase hydrogenation refining reaction.

[0057] Specifically, the concentration of the caprolactam aqueous solution is 5-60 wt%, more preferably 10-50 wt%.

[005...

Embodiment 1

[0064] This embodiment shows that the average particle size is 3mm, and the composition is Ni 40 Al 60 The preparation process of granular Raney nickel catalyst prepared by alkali solution activation treatment of metal alloy particles.

[0065] In a specific embodiment, it is accurately weighed that the average particle diameter is 3 mm and the composition is Ni 40 Al 60 500g of metal alloy particles, placed in a quartz glass tube with an inner diameter of 50mm, the NaOH alkali solution with a concentration of 1wt% flows from the bottom of the quartz glass tube through the metal alloy particle bed at a rate of 10L / h and then flows out from the top, NaOH alkali The weight space velocity of the liquid is 20h -1 . The bed temperature is 70°C, and the activation treatment time is 2h. After lye activation treatment, wash with deionized water at 50° C. until the pH of the solution after washing is 7-9. The average composition of the prepared granular Raney nickel catalyst is N...

Embodiment 2

[0067] This embodiment shows that the average particle size is 3mm, and the composition is Ni 40 Al 60 The preparation process of granular Raney nickel catalyst prepared by alkali solution activation treatment of metal alloy particles.

[0068] In a specific embodiment, the preparation of the granular Raney nickel catalyst is carried out according to the method described in Example 1, the difference is that the NaOH lye concentration is 2wt%, the average of the prepared granular Raney nickel catalyst Composed of Ni 56.6 Al 43.4 .

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Abstract

The invention discloses a caprolactam hydrofining catalyst and method. The method comprises the steps of preparing metal alloy particles, activating the metal alloy particles with alkali liquor, washing the activated metal alloy particles with deionized water to obtain a particulate raney nickel catalyst, and conducting hydrofining on caprolactam in a fixed bed reactor by means of the particulate raney nickel catalyst. Operation is easy, hydrofining effect is improved greatly, application prospects are broad, and economic benefits are great.

Description

technical field [0001] The invention relates to the field of caprolactam preparation, in particular to a caprolactam hydrorefining catalyst used in a fixed-bed reactor and a caprolactam hydrorefining method. Background technique [0002] As a monomer of synthetic fibers and engineering plastics, caprolactam has a large domestic demand, and it is increasing year by year. The production steps of caprolactam mainly include the hydrogenation of benzene to cyclohexane, the oxidation of cyclohexane to cyclohexanone, the oximation of cyclohexanone to cyclohexanone oxime, and the transposition rearrangement of cyclohexanone oxime to generate caprolactam. Due to the complex production process of caprolactam, some unsaturated by-products other than caprolactam will inevitably be produced. The physical and chemical properties of these unsaturated by-products are very similar to those of caprolactam, and it is difficult to remove them by extraction and distillation. Existing and affect...

Claims

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Application Information

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IPC IPC(8): B01J25/02C07D223/10C07D201/16
CPCY02P20/52
Inventor 王立敏孙兵戴连欣钱蔚成国海光邹玮龚耀耀丁佩玉
Owner SHANGHAI XUNKAI NEW MATERIAL TECH
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