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Nitrile hydrogenation catalyst, and preparation method and application thereof

A hydrogenation catalyst and catalyst technology, applied in the direction of catalyst activation/preparation, catalyst carrier, molecular sieve catalyst, etc., can solve the problem of indetermination of raw material space velocity, lack of introduction of the solubility of isophthalonitrile solution, and insufficient activity of single active component catalysts. Advanced problems, achieve good industrial application prospects, solve low product selectivity, and solve the effect of easy inactivation

Active Publication Date: 2021-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the incomplete reaction of isophthalonitrile and m-methylaminobenzonitrile occurred in the reaction results, indicating that the activity of the single active component catalyst is not high
CN201310180022.6 discloses a method for preparing m-xylylenediamine by continuous hydrogenation in a fixed bed. The process uses a nickel catalyst modified by an alkaline additive, and the yield of xylylenediamine can reach 96%, but this method does not introduce The solvent used and the solubility of the isophthalonitrile solution cannot determine the space velocity of the raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this example, 88 wt.% of liquid ammonia and 2 wt.% of m-xylylenediamine were used as solvents, and a solution of isophthalonitrile with a solubility of 10 wt.% was prepared at 25°C. A fixed bed reactor is used, the loading amount of the above catalyst is 3.5g, the reaction temperature is 90°C, the reaction pressure is 8MPa, and the volume space velocity is 3.5h -1 , hydrogen / isophthalonitrile (molar ratio)=50. After the reaction, the gas chromatography was used for quantitative analysis after separation, and the results are shown in Table 1.

[0040] Table 1 Hydrogenation produces m-xylylenediamine reaction result

[0041] catalyst Conversion rate of isophthalonitrile (%) m-xylylenediamine selectivity (%) 1 100 95.1 2 100 97.8 3 100 95.3 4 100 95.1 5 100 93.2 6 100 96.5 7 100 97.2 8 100 98.1 9 100 97.0 10 100 92.1 11 100 97.2 12 100 97.4 Comparative example 1 100 91.2 Comp...

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Abstract

The invention discloses a preparation method and application of a nitrile hydrogenation catalyst. The preparation method comprises the following steps: carrying out mixing kneading, granulation and heat treatment on an all-silicon molecular sieve and a silica sol solution in proportion to obtain the carrier, loading a metal active component and an auxiliary agent on the carrier in proportion, and carrying out drying, roasting and reduction to obtain the target catalyst. The catalyst prepared by the method disclosed by the invention has higher activity and higher m-xylylenediamine yield in a reaction for preparing m-xylylenediamine by continuous hydrogenation in a fixed bed. The problems that the catalyst is easy to inactivate and the product selectivity is low in the existing intermittent kettle technology are solved, and the industrial application prospect is good.

Description

technical field [0001] The invention relates to a preparation method and application of a nitrile hydrogenation catalyst. Background technique [0002] m-Xylylenediamine is a colorless liquid with a bitter almond smell at room temperature, and is an important fine chemical raw material. It is mainly used in the production of special plastics and paints, and can also be used in the synthesis of pesticides, antirust agents, rubber additives, lubricants, paper processing agents, etc. [0003] m-xylylenediamine is produced by liquid-phase hydrogenation of isophthalonitrile, and the reaction process is mainly based on tank-type intermittent hydrogenation and fixed-bed continuous hydrogenation. Since the raw material isophthalonitrile has low solubility at room temperature, it is an important research content to find a suitable solvent or feed process and a catalyst that matches the process. CN2011110070427.5 introduces a process for preparing m-xylylenediamine by autoclave-type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01J32/00B01J35/10B01J37/02C07C209/48C07C211/27
CPCB01J29/0308B01J29/03B01J29/0333B01J29/0341B01J37/0207C07C209/48B01J2229/32B01J35/617B01J35/635C07C211/27Y02P20/584
Inventor 李鹏田志坚马怀军曲炜刘浩潘振栋王从新韩健强王冬娥王琳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI