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Preparation method of special catalyst for nitrobenzene hydrogenation production of p-aminophenol

A technology for p-aminophenol and a preparation method, applied in the chemical industry, can solve the problems of fast catalyst consumption, poor selectivity, restricting the profitability of enterprises, etc., so as to reduce material costs and waste water treatment costs, reduce catalyst consumption, and improve hydrogenation reaction. The effect of the condition

Pending Publication Date: 2020-12-29
张国良 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing Pt / C catalysts generally have problems such as poor selectivity, low reaction yield, slow speed, few application times, and rapid deactivation. Profitability

Method used

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  • Preparation method of special catalyst for nitrobenzene hydrogenation production of p-aminophenol
  • Preparation method of special catalyst for nitrobenzene hydrogenation production of p-aminophenol
  • Preparation method of special catalyst for nitrobenzene hydrogenation production of p-aminophenol

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Effect test

Embodiment 1

[0023] This embodiment discloses a preparation method of a special catalyst for producing p-aminophenol by hydrogenation of nitrobenzene, comprising the following steps:

[0024] S1. Pretreatment of coconut shell activated carbon

[0025] Add 2000g of coconut shell activated carbon to 4000mL of pure water, add 2000mL of 10% nitric acid under stirring, heat to 90°C, keep warm for 30min, cool and filter, and wash with pure water until neutral;

[0026] S2. Making Pt / C catalyst

[0027] Add the pretreated coconut shell activated carbon into 108mL of 10% aqueous solution of chloroplatinic acid, raise the temperature to 90-95°C, keep it warm for 20-40min; cool down to 60-70°C, add sodium carbonate while stirring, and adjust to alkali Add 200mL of 37% formaldehyde solution, then raise the temperature to 90°C, keep the pH value in the range of 9-10, keep it warm for 2.5 hours, then cool, filter, and fully wash until neutral;

[0028] S3. Add modifier

[0029] Add 0.4g of silver ni...

Embodiment 2

[0031] This embodiment discloses a preparation method of a special catalyst for producing p-aminophenol by hydrogenation of nitrobenzene, comprising the following steps:

[0032] S1. Pretreatment of coconut shell activated carbon

[0033] Add 2000g of coconut shell activated carbon to 4500mL of pure water, add 1500mL of 10% nitric acid under stirring, heat to 90°C, keep warm for 30min, cool and filter, and wash with pure water until neutral;

[0034] S2. Making Pt / C catalyst

[0035] Add the pretreated coconut shell activated carbon into 135mL of 8% chloroplatinic acid aqueous solution, raise the temperature to 90-95°C, and keep it warm for 20-40min; cool down to 60-70°C, add sodium carbonate while stirring, and adjust to alkali Add 300mL of 37% formaldehyde solution, then raise the temperature to 90°C, keep the pH value in the range of 9-10, keep it warm for 2.5 hours, then cool, filter, and fully wash until neutral;

[0036] S3. Add modifier

[0037] Add 0.6 g of silver n...

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Abstract

The invention discloses a preparation method of a special catalyst for nitrobenzene hydrogenation production of p-aminophenol. The preparation method comprises the following steps: pretreating cocoanut active charcoal, preparing a Pt / C catalyst and adding a modifier. The catalyst produced by the method has the advantages of high activity, high selectivity, high stability and the like. The catalystconsumption can be greatly reduced, the production cost of enterprises is reduced, and the method has good market value. Meanwhile, the catalyst can improve nitrobenzene hydrogenation reaction conditions, so that the sulfuric acid concentration of a medium is reduced to below 8% from 15%-20% in the prior art, and the material cost and the wastewater treatment cost are further reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of a special catalyst for producing p-aminophenol by hydrogenation of nitrobenzene. Background technique [0002] p-Aminophenol is an important pharmaceutical intermediate, dye raw material and rubber auxiliary. The market at home and abroad is vast. [0003] There are many production process routes of p-aminophenol, including: p-nitrophenol iron powder reduction method, p-nitrophenol hydrogenation reduction method, nitrobenzene electrolytic reduction method and nitrobenzene hydrogenation reduction method. The iron powder reduction method has been ordered to prohibit production due to serious pollution; the nitrobenzene electrolytic reduction method cannot be produced because a series of problems in industrialization cannot be solved. Therefore, at present, the mainstream manufacturers in my country mainly use p-nitrophenol hydrogenation method fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J27/25C07C213/00C07C215/76
CPCB01J23/42B01J27/25C07C213/00C07C215/76
Inventor 张国良姜艳娟董丹
Owner 张国良
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