One-pot process for synthesizing permanent violet RL

A technology of permanent violet and process, applied in the direction of bisazine oxazine dyes, etc., can solve the problems of high labor intensity, high safety hazard, and the whole process cannot be automated, and achieves the effect of high labor intensity and simplified process.

Active Publication Date: 2021-04-30
内蒙古彩晶新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The total synthesis system is the same o-dichlorobenzene system, which simplifies the process and realizes the automation of the whole process, thus solving the problems of high labor intensity, poor operating environment and great safety hazards in the existing process where intermediate products have to be separated and refined. The problem that the whole process cannot be automated

Method used

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  • One-pot process for synthesizing permanent violet RL
  • One-pot process for synthesizing permanent violet RL
  • One-pot process for synthesizing permanent violet RL

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Alkylation process

[0035] 1. Through the liquid caustic soda pump, put 900L of prepared caustic soda into the alkylation pot, where the caustic caustic comes from the soda dispensing kettle;

[0036] 2. Open the manhole cover of the 3000L alkylation pot, put in 600 kg of carbazole and 6 kg of triethylbenzyl ammonium chloride catalyst, then cover and seal the reaction kettle, put in 310L o-dichlorobenzene through the metering barrel, and then pass Add 290L of ethyl bromide to the metering barrel first;

[0037] 3. Use micro-jacketed steam intermittently to trigger the reaction. If the temperature rises, the reaction starts. Turn off the steam, and the temperature will slowly rise to about 110°C and start to drop. At this time, turn on the steam to keep warm;

[0038] 4. When the solid carbazole in the alkylation pot disappears and turns into an oily liquid as the end point of the reaction, if necessary, take a sample to test the end point of the reaction;

[0039] 5....

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Abstract

The invention discloses a process for synthesizing permanent violet RL by a one-pot method. The process comprises the following steps: S1, alkylation; S2, nitrification; S3, reduction; and S4, condensation ring-closing. Compared with the prior art, the production process disclosed by the invention is mainly improved in alkylation, nitrification and reduction procedures, so that the operation time is greatly shortened, raw materials are saved, wastes are reduced, the labor intensity is low, a large amount of manpower and equipment energy are saved, and the intermediate procedure is simplified. According to the invention, o-dichlorobenzene is used as a solvent, so that a condenser can use common circulating water due to the boiling point of o-dichlorobenzene so as to save energy, the reaction temperature can be increased so as to shorten the reaction time, and after the reaction is finished, direct standing for layering is performed without distilling the solvent, and the next step is performed.

Description

Technical field: [0001] The invention relates to a method for synthesizing organic pigments, specifically referring to the "one-pot" synthesis process of permanent violet RL. Background technique: [0002] Permanent Violet RL, N-ethylcarbazole dioxazine, alias Pigment Violet 23#, pigment index number C.I.23#, English name: PIGMENT VIOLET23#, molecular weight 589.5, molecular formula C 34 h 22 o 2 N 4 Cl 2 , the structural formula is The product application of permanent violet RL: permanent violet RL is a high-grade organic pigment of dioxazine, which is widely used in the coloring of paints, inks, coatings, plastics, rubber and printing pastes. Permanent Violet RL is a high-performance organic pigment variety. Its basic hue is blue-light purple. Through special pigmentation treatment, it can also obtain a reddish shade. It has excellent heat resistance and light fastness, and can almost withstand All organic solvents, so it can be used in many application media and ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B19/02
CPCC09B19/02Y02P20/584
Inventor 王卫臣张伟姚发伟马建民
Owner 内蒙古彩晶新材料科技有限公司
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