Catalyst for synthesizing p-dimethylaminobenzoate and preparation method and application thereof

A technology of dimethylaminobenzoate and nitrobenzoate, applied in the field of catalysts and preparations for the synthesis of p-dimethylaminobenzoate, capable of solving low production efficiency, high toxicity, and low product yield and other problems, to achieve the effect of improving cost performance, strong acidity, and high molar yield

Active Publication Date: 2019-03-12
XIAN CATALYST NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These three methods all have defects such as low production efficiency, high toxicity, and low product yield, and cannot meet th

Method used

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Effect test

Embodiment 1

[0027] 1. a catalyst for synthesizing p-dimethylaminobenzoate, comprising metal Ni, Pd and carrier aluminum oxide, the mass percentage composition of Ni is 0.8% in the described catalyst, and the mass percentage composition of Pd is 0.3%, The rest is alumina; wherein, the alumina is a hollow bar-shaped γ-alumina with a length of 3-6mm, an outer diameter of 1.5mm, and an inner diameter of the middle cavity of 0.8mm.

[0028] 2. a preparation method of a catalyst for synthesizing p-dimethylaminobenzoate, comprising the following steps:

[0029] (1) Carrier pretreatment: Soak alumina in a hydrochloric acid solution with a volume concentration of 10% for 2 hours, take it out and dry it at 120°C for 12 hours, then soak it in ethanol until the adsorption is saturated, take it out and dry it at 120°C 12h, and then roasted at 800°C for 1.5h in a muffle furnace to obtain a pretreated alumina carrier;

[0030] (2) Preparation of Ni-loaded catalyst precursor by equal-volume impregnation...

Embodiment 2

[0035] 1. a catalyst for synthesizing p-dimethylaminobenzoate, comprising metal Ni, Pd and carrier alumina, the mass percentage composition of Ni is 1% in the described catalyst, and the mass percentage composition of Pd is 0.2%, The rest is alumina; wherein, the alumina is a hollow bar-shaped γ-alumina with a length of 3-6mm, an outer diameter of 1.5mm, and an inner diameter of the middle cavity of 0.8mm.

[0036] 2. a preparation method of a catalyst for synthesizing p-dimethylaminobenzoate, comprising the following steps:

[0037] (1) Carrier pretreatment: Soak alumina in a hydrochloric acid solution with a volume concentration of 9% for 2 hours, take it out and dry it at 120°C for 12 hours, then soak it in ethanol until the adsorption is saturated, take it out and dry it at 120°C 12h, and then roasted in a muffle furnace at 900°C for 0.5h to obtain a pretreated alumina carrier;

[0038] (2) Preparation of Ni-loaded catalyst precursor by equal-volume impregnation method: D...

Embodiment 3

[0043] 1. a catalyst for synthesizing p-dimethylaminobenzoate, comprising metal Ni, Pd and carrier aluminum oxide, the mass percentage composition of Ni is 1% in the described catalyst, and the mass percentage composition of Pd is 0.3%, The rest is alumina; wherein, the alumina is a hollow bar-shaped γ-alumina with a length of 3-6mm, an outer diameter of 1.5mm, and an inner diameter of the middle cavity of 0.8mm.

[0044] 2. a preparation method of a catalyst for synthesizing p-dimethylaminobenzoate, comprising the following steps:

[0045] (1) Carrier pretreatment: Soak alumina in a hydrochloric acid solution with a volume concentration of 6% for 2 hours, take it out and dry it at 120°C for 12 hours, then soak it in ethanol until the adsorption is saturated, take it out and dry it at 120°C 12h, and then roasted in a muffle furnace at 900°C for 1h to obtain a pretreated alumina carrier;

[0046] (2) Preparation of Ni-loaded catalyst precursor by equal-volume impregnation meth...

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Abstract

The invention discloses a catalyst for synthesizing p-dimethylaminobenzoate and a preparation method and application thereof. The catalyst contains metal of Ni and Pd and a carrier of aluminum oxide.In the catalyst, mass percent content of the Ni is 0.8-1.1%, mass percent content of the Pd is 0.2-0.5%, and the rest is the aluminum oxide. The invention further discloses the preparation method andthe application of the catalyst. In the presence of the prepared catalyst, p-nitrobenzoate and formaldehyde as raw materials are subjected to the nitro hydrogenation and methyl addition reaction by one step to generate a target product, wherein a molar yield is high. In a preparation process, subsection filling and subsection feeding modes are used. At the upper end of a reaction tube, the catalyst mainly performs a nitro hydrogenation reaction which is an exothermic reaction, and the reaction is violent. A material with reaction heat after the previous reaction enters the next catalyst. The material is mainly an amino compound, and a methyl addition reaction is performed with theformaldehyde. A small amount of residual unreacted nitro compound is rapidly converted into the amino compoundon the undiluted catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a catalyst for synthesizing p-dimethylaminobenzoate, its preparation method and application. Background technique [0002] P-dimethylaminobenzoate compounds, commonly used mainly include methyl p-dimethylaminobenzoate, ethyl p-dimethylaminobenzoate, n-butyl p-dimethylaminobenzoate, isoamyl p-dimethylaminobenzoate Esters and isooctyl p-dimethylaminobenzoate, these p-dimethylaminobenzoic acid compounds have good anti-ultraviolet properties, so they are widely used in anti-ultraviolet additives, and can play a better role in cosmetics and sunscreens. Good sunscreen effect, especially isooctyl p-dimethylaminobenzoate is recommended by the US Food and Drug Administration as a first-class sunscreen agent. p-Dimethylaminobenzoate compounds, as ultraviolet photoinitiators, are also a class of highly efficient amine accelerators. They are usually used in combination with ph...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C227/04C07C229/60
CPCC07C227/04B01J23/892C07C229/60
Inventor 林涛张力程杰张炳亮万克柔张之翔曾永康曾利辉高武
Owner XIAN CATALYST NEW MATERIALS CO LTD
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