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

A kind of desalination method for rt base production

A technology of base and nitrobenzene method, applied in the field of RT base production and desalination, to achieve the effect of avoiding poisoning

Active Publication Date: 2019-09-17
CHINA PETROLEUM & CHEM CORP +1
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new desalination method in the production process of RT base, by using calcium hydroxide (or calcium oxide) as the desalination agent and extracting the water phase with the reducing solution in the production process of RT base as raw material Desalting is carried out to solve the problems existing in the existing desalting process

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use 500g of the nitrobenzene method RT base extraction water phase with a mass percentage of methanol of 12.70% and a mass percentage of carbonate of 0.82% as the raw material for desalination, add 5.70g of 95% calcium hydroxide, and control the temperature at 30°C , continuously stirred for 3 hours, and filtered to obtain filtrate and filter residue. The mass percentage of carbonate in the filtrate was 0.12%, and the desalination efficiency was 85.4%. The molar ratio of carbonate to hydroxide in the filtrate was 0.029:1.

Embodiment 2

[0019] Using 500g of the nitrobenzene method RT base extraction water phase with a mass percentage of methanol of 3.12% and a mass percentage of carbonate of 0.72% as the raw material for desalting, 5.28g of 90% calcium oxide was added, and the temperature was controlled at 20°C. Stir continuously for 20 hours, and filter to obtain filtrate and filter residue. The mass percentage of carbonate in the filtrate is 0.10%, and the desalination efficiency is 86.1%. The molar ratio of carbonate to hydroxide in the filtrate is 0.025:1.

Embodiment 3

[0021] Use 500g of the nitrobenzene method RT base extraction water phase with a mass percentage of methanol of 9.51% and a mass percentage of carbonate of 0.79% as the raw material for desalination, add 7.91g of 95% calcium hydroxide, and control the temperature at 20°C , continuously stirred for 4 hours, and filtered to obtain filtrate and filter residue. The mass percentage of carbonate in the filtrate is 0.08%, and the desalination efficiency is 98.7%. The molar ratio of carbonate to hydroxide in the filtrate was 0.019:1.

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 belongs to the technical field of fine chemistry and relates to a desalting method for RT base production. Under the condition of 10-60 DEG C, a extraction water phase of a reducing solution prepared by raneys nickel hydrogenation in the nitrobenzene-process RT base production is added into a reactor; a desalting agent is added according to a ratio, a reaction is carried out for 0.2-20 h, and solid-liquid separation is conducted to obtain desalted base. According to the method, calcium hydrate, calcium oxide or calcium hydrate aqueous solution is used as the desalting agent, and the nitrobenzene-process RT base extraction water phase undergoes desalting. Then, content of carbonate ions in organic base is reduced, and excessive carbonate ions in the organic base are avoided so as to prevent side effects from increasing and prevent hydrogenation catalyst poisoning.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and relates to a desalination method for RT base production. Background technique [0002] It has been more than 100 years since p-aminodiphenylamine (RT base) was first synthesized. With the increase in the amount of RT base and the improvement of product quality requirements, its synthesis route is constantly innovating. Although there are more than a dozen synthetic routes, there are three main ones used for industrialization: diphenylamine method, aniline method and nitrobenzene method. [0003] The nitrobenzene method is currently the latest international industrial synthesis of RT base technology. It is a clean and green technology that has developed rapidly in recent years. The outstanding advantage of the nitrobenzene method is that there are very few three wastes, but the technical difficulty is relatively high, and the production control is relatively difficult. This method al...

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 Patents(China)
IPC IPC(8): C07C209/86C07C209/60C07C211/56
Inventor 陈永平吴其建刘卓金汉强金玉存何育苗
Owner CHINA PETROLEUM & CHEM CORP