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

Purification process of o-phenylenediamine

A technology of o-phenylenediamine and process, which is applied in the field of purification process of o-phenylenediamine, can solve the problems that the content and color number are difficult to meet high-quality requirements, and achieve the goals of reduced energy consumption, stable product quality, and increased product yield Effect

Active Publication Date: 2016-03-09
NANTONG BOTAO CHEM
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the production process of benzotriazole with o-phenylenediamine as raw material, conventional crude o-phenylenediamine is usually used for production, and the generated benzotriazole needs to be pickled, washed with water, rectified, decolorized and recrystallized, etc. More process steps can meet the requirements, otherwise there will be more impurities, which will make the content and color number difficult to meet the high-quality requirements. However, the quality requirements for benzotriazole in the market are getting higher and higher, so it is necessary to purify o-phenylenediamine. Process optimization to prepare high-quality benzotriazole

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
  • Purification process of o-phenylenediamine
  • Purification process of o-phenylenediamine
  • Purification process of o-phenylenediamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw materials: crude product of o-phenylenediamine, the content of o-phenylenediamine is 90%, and the appearance is brown crystal; the protective agent is more than 80%, which is an industrial product.

[0018] Pilot equipment:

[0019] 1) Distillation equipment: 3600L still, made of 304 stainless steel; Φ600×195000mm rectifying tower, packing height 9000mm, made of 304 stainless steel;

[0020] 2) Crystallization equipment: Vacuum or nitrogen protection flaking machine.

[0021] The purification process of o-phenylenediamine is as follows:

[0022] 4 tons of crude o-phenylenediamine with a content of 90% pre-dissolved in the storage tank V1 is transported to the rectification column kettle through the pump P1 at 120±2°C, and the ingredients are circulated in the thin film evaporator E1 through the circulation pump P2 for heating , generate gas, rise to the tower for exchange and separation through packing, the gas phase is cooled by the condenser E2 at the top of the...

Embodiment 2

[0026] In this embodiment, the vacuum degree is 6 mmHg, the temperature of the tower kettle is 130° C., the protective agent is 1 g, and the rest are the same as in Embodiment 1.

Embodiment 3

[0028] In this embodiment, the vacuum degree is 10 mmHg, the temperature of the tower kettle is 145° C., the protective agent is 0.5 g, and the rest are the same as in Embodiment 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 discloses a purification process of o-phenylenediamine. The crude o-phenylenediamine is used as a raw material, and the synthesis of o-phenylenediamine adopts the ammonolysis and reduction process of o-chloronitrobenzene, and the crude o-phenylenediamine is transported to rectification The tower kettle is rectified and purified. The vacuum degree of the whole rectification process is controlled at 6-10mmHg, and the temperature of the tower kettle is about 145±3°C. Finally, an appropriate amount of protective agent is added to the material in the product, and the material is protected under vacuum or nitrogen protection. Sheeting is carried out to obtain the finished product of white o-phenylenediamine. The invention has the advantages of simple process, stable and reliable operation, reduced energy consumption, stable and high product quality and high product yield.

Description

technical field [0001] The invention relates to a purification process of o-phenylenediamine and belongs to the field of fine chemical preparation. Background technique [0002] O-phenylenediamine is an important organic chemical, often used as an intermediate for dyes, pesticides, auxiliaries, photosensitive materials, etc., for the manufacture of polyamide, polyurethane, carbendazim and thiophanate, vat red GG, leveling agent, Antiaging agent MB is also used in the preparation of developers, surfactants, etc. At present, with the development of technology, the demand for high-quality o-phenylenediamine in the international and domestic markets is increasing year by year. [0003] In the production process of benzotriazole with o-phenylenediamine as raw material, conventional crude o-phenylenediamine is usually used for production, and the generated benzotriazole needs to be pickled, washed with water, rectified, decolorized and recrystallized, etc. More process steps can...

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): C07C211/51C07C209/84
Inventor 黄海波黄奎生王宏黄雪平
Owner NANTONG BOTAO CHEM