Unlock instant, AI-driven research and patent intelligence for your innovation.

Production method of p-aminophenol

A technology of p-aminophenol and its production method, which is applied in chemical instruments and methods, preparation of amino hydroxyl compounds, preparation of organic compounds, etc., can solve problems such as pollution yield, and achieve the effect of high yield and low cost

Inactive Publication Date: 2015-02-18
LIAONING SHIXING PHARMA & CHEM
View PDF3 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method solves the technical problems of pollution and low yield through hydrogenation reduction, crystallization, refining, dry packaging and other processes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method of p-aminophenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] First, 60% methanol and p-nitrophenol with a molar ratio of 1:0.6 are mixed and dissolved by an in-line mixer. The dissolved material is metered into the hydrogenation unit through the pump according to the flow rate of 5000L / h, and the modified Raney nickel catalyst is added, the main body is Ni, and the additive is Mo or Cr or Ti or Fe or Co or Cu or Mn or Ba metal One or more types of salt.

[0051] Open the hydrogen valve and the heated steam valve of the hydrogenation kettle, heat and feed hydrogen, keep the reaction temperature at 60-180°C, and the reaction pressure at 0.5-2.0MPa; carry out continuous hydrogenation reaction in the presence of a catalyst. After 6-8 hours of reaction, the qualified hydrogenation liquid enters the catalyst settler, and the catalyst separated in the settler returns to the hydrogenation system. After decompression, the supernatant liquid from the settler enters the ceramic membrane filtration system to remove the catalyst. The clear l...

Embodiment 2

[0055]Basically the same as Example 1, the difference is the modified Raney nickel catalyst, the main body is Ni, and the additives are Mo, Cr or Mo, Ti or Mo, Fe or Mo, Co or Mo, Cu or Mo, Mn or Mo, Ba Or Mo, Cr, Ti or Mo, Cr, Fe or Mo, Cr, Co or Mo, Cr, Cu or Mo, Cr, Mn or Mo, Cr, Ba or Mo, Cr, Ti, Fe or Mo, Cr, Ti , Co or Mo, Cr, Ti, Cu or Mo, Cr, Ti, Mn or Mo, Cr, Ti, Ba or Mo, Cr, Ti, Fe, Co or Mo, Cr, Ti, Fe, Cu or Mo, Cr , Ti, Fe, Mn or Mo, Cr, Ti, Fe, Ba or Mo, Cr, Ti, Fe, Co, Cu or Mo, Cr, Ti, Fe, Co, Mn or Mo, Cr, Ti, Fe, Co , Ba or Mo, Cr, Ti, Fe, Co, Cu, Mn or Mo, Cr, Ti, Fe, Co, Cu, Ba or Mo, Cr, Ti, Fe, Co, Cu, Mn, Ba metal salts.

[0056] Features of the invention

[0057] In the production of p-aminophenol in the present invention, the catalyst can be recycled in the production process.

[0058] Methanol used in the reaction process can also be recycled.

[0059] The hydrogenation reaction is carried out continuously during the reaction process.

[0060] T...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a production method of p-aminophenol. The method comprises the steps that methyl alcohol and p-nitrophenol are mixed and dissolved; dissolved material is fed into a hydrogen reactor, a catalyst is also fed into the hydrogen reactor, a hydrogen valve of the hydrogen reactor and a heated steam valve are opened, hydrogen is heated and fed into the hydrogen reactor, and continuous hydrogenation reaction is performed in the condition of the existence of the catalyst; clear liquid enters a continuous crystallizer and then is subjected to heat exchange and cooling crystallization through cooled water and chilled water; crystalline liquid is subjected to solid-liquid separation after crystallization, liquid-phase mother liquor flows into a mother liquor tank, and surplus mother liquor is distilled to recycle methyl alcohol; solid-phase crude products are subjected to pyrosulfite soaking; finished products are subjected to solid-liquid separation; liquid-phase finished mother liquor is reused; solid-phase finished crystal is dried and then packaged and stored.

Description

technical field [0001] The invention relates to a method for synthesizing substances in the chemical industry, in particular to a method for producing p-aminophenol. Background technique [0002] p-Aminophenol: [0003] Chinese synonyms: 4-aminophenol; p-hydroxyaniline; p-aminophenol. [0004] p-Aminophenol is a kind of fine organic chemical intermediate widely used in my country at present. It is used in the dye industry to synthesize weak acid yellow 6G, weak acid bright yellow 5G, sulfur dark blue 3R, sulfur blue CV, sulfur brilliant green GB, sulfur Red brown B3R, vulcanization reduction black CLG, etc. In the pharmaceutical industry, p-aminophenol is used to synthesize paracetamol, clofibrate, etc. Also used in the preparation of developers, antioxidants and petroleum additives and other products. [0005] production method: [0006] 1. Phenol nitrosation method: [0007] Add 90% phenol solution into 40% sulfuric acid solution, add 45% sodium nitrite solution under...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/02C07C213/10C07C215/76
Inventor 董大为王文勇高华唯马洪茹梁新文李春雨
Owner LIAONING SHIXING PHARMA & CHEM