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Nitrification system, synthesis system and method for continuous synthesis of permanent violet

A nitrification system, permanent violet technology, applied in the field of synthesis system, continuous synthesis of permanent violet nitrification system, can solve the problems of severe heat release of nitrification reaction, poor nitrification selectivity, risk of high heat runaway, etc., to reduce material loss , Reduce the generation of by-products, the effect of excellent mass transfer and heat transfer effect

Active Publication Date: 2022-07-12
XUANCHENG YABANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The inventors believe that the existing permanent violet pigment synthesis process has the following defects: (1) the exothermic heat of the nitration reaction is severe, and there is a greater risk of thermal runaway and a greater safety risk in the kettle reaction; (2) the kettle reaction is stirred The effect is poor, and there is local overheating when nitric acid is added dropwise, resulting in poor nitration selectivity and more reaction by-products; (3) still reaction efficiency is low, and the amount of nitric acid is large, and the number of moles exceeds that of ethyl carbazole. 2 times

Method used

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  • Nitrification system, synthesis system and method for continuous synthesis of permanent violet
  • Nitrification system, synthesis system and method for continuous synthesis of permanent violet
  • Nitrification system, synthesis system and method for continuous synthesis of permanent violet

Examples

Experimental program
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Embodiment 1

[0062] Embodiment 1 is used for the nitration system of continuous synthesizing permanent violet

Embodiment 1-1

[0064] The schematic diagram of the nitrification system described in this example is as follows: figure 1 As shown in the figure, it includes an ethylcarbazole dissolving kettle, a microreactor and a reaction liquid receiving tank connected in sequence, and the material inlet of the ethylcarbazole dissolution kettle includes an ethylcarbazole inlet and an o-dichlorobenzene inlet, The microreactor feeding port includes a nitric acid feeding port and an ethylcarbazole-o-dichlorobenzene solution feeding port, the reaction liquid receiving tank feeding port includes a pH adjusting agent feeding port, and the material in the reaction liquid receiving tank is The outlet obtains 3-nitro-N-ethylcarbazole, wherein the material used in the microreactor is a corrosion-resistant material, and the material used in this embodiment is Hastelloy.

[0065] Wherein, the structure of the microreactor includes an outer casing and an inner cylinder disposed inside the outer casing, a microreactio...

Embodiment 1-2

[0069] The nitrification system described in this example is similar to Example 1-1, and the schematic diagram is as follows figure 2As shown, the difference from Example 1-1 is: the ortho-dichlorobenzene feeding port of the ethylcarbazole dissolving kettle is connected with an ortho-dichlorobenzene metering tank, for accurately measuring the addition of ortho-dichlorobenzene, The discharge port of the ethylcarbazole dissolving kettle is connected with an ethylcarbazole solution storage tank; the feed port of the microreactor is connected with an alkylated carbazole liquid storage tank (ethylcarbazole liquid storage tank) and a dilute nitric acid storage tank, the feeding port of the dilute nitric acid liquid storage tank is connected with an acid preparation kettle for configuring the dilute nitric acid of the required concentration; the pH regulator feeding port of the reaction liquid receiving kettle is connected with a liquid caustic soda The metering tank is used to adju...

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Abstract

The invention relates to a nitration system, a synthesis system and a method for continuous synthesis of permanent violet. The nitration system comprises an ethylcarbazole dissolving kettle, a microreactor and a reaction liquid receiving tank which are connected in sequence. The carbazole dissolving kettle is provided with an ethylcarbazole feed port and an o-dichlorobenzene feed port, the microreactor is provided with a nitric acid feed port, and the reaction liquid receiving tank discharge port is used to output 3-nitric acid The nitration product of ethyl-N-ethylcarbazole; the synthesis system includes a nitration system and a hydrogenation reduction system, and the hydrogenation reduction system includes a reduction dehydration kettle, a hydrogenation reduction kettle, a dehydration kettle condensation reaction kettle and The closed-loop reaction kettle and the feed inlet of the reduction and dehydration kettle are communicated with the oil phase outlet of the water separation tank. The nitrification system and the synthesis system of the invention can improve the intrinsic safety of the nitrification reaction, improve the conversion rate of raw materials, and effectively improve the product yield.

Description

technical field [0001] The invention relates to the technical field of preparation of organic pigments, mainly relates to the technical field of preparation of permanent violet, and in particular relates to a nitration system, a synthesis system and a method for continuous synthesis of permanent violet. Background technique [0002] Permanent Violet RL, the dye index number is C.I. Pigment Violet 23, and its structural formula is as follows: [0003] [0004] The Permanent Violet RL is one of the most expensive pigments in the world, and it is also the best purple pigment used in the plastics industry today. Among the existing purple pigment varieties, C.I. Pigment Violet 23 has the best tinting strength, and also has outstanding brightness, excellent heat resistance, permeation resistance and good light fastness. Combined with phthalocyanine blue pigment, it can still maintain its good light fastness after the adjustment period. Even its light-coloured products exhibit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/00C09B19/00C07D498/22
CPCB01J19/0093C09B19/00C07D498/22Y02P20/10
Inventor 汪国建殷守华孙涛陶文大胡平刘邦坤宁亮王彬彬
Owner XUANCHENG YABANG CHEM