Production system and process method for preparing high-transparency and high-strength monoazo pigment

A monoazo pigment, high transparency technology, applied in the direction of monoazo dyes, azo dyes, chemical instruments and methods, etc., can solve the problem of high viscosity of pigment slurry blocking microchannels, decreased conversion rate of coupling components, diazo Problems such as poor mixing effect of chemical reaction

Active Publication Date: 2020-07-07
SHENYANG RES INST OF CHEM IND +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problems of poor mixing effect of diazotization reaction, many side reactions, and low yield of diazonium salt in the existing method for continuously synthesizing azo dyes, and the poor mixing effect in the coupling reaction process, the coupling group analysis leads to coupling The conversion rate of components is reduced, the product quality is poor, the viscosity of the pigment slurry is high and the microchannel is blocked, and the production system and process method for the preparation of high transparency and high strength monoazo pigments are proposed.

Method used

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  • Production system and process method for preparing high-transparency and high-strength monoazo pigment
  • Production system and process method for preparing high-transparency and high-strength monoazo pigment
  • Production system and process method for preparing high-transparency and high-strength monoazo pigment

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Embodiment 1

[0047] Such as Figure 1-8 As shown, the production system of the present invention includes a continuous diazotization device and a continuous coupling reaction device, wherein such as figure 1 As shown, the continuous diazotization device includes a sodium nitrite solution storage tank 1, a water storage tank 2, a slurry storage tank 3, a high-pressure tank 7, a membrane dispersion microreactor 8, a first delay tube 9 and a diazonium salt solution Storage tank 10, wherein film dispersion microreactor 8 is provided with dispersed phase fluid inlet pipe 81, continuous phase fluid inlet pipe 82 and mixed solution outlet pipe 83, sodium nitrite solution storage tank 1 passes through the first nitriding pipeline 11 and The dispersed-phase fluid inlet pipe 81 is connected to each other, and the first nitriding input pump 4 is provided on the first nitriding pipeline 11, and an elastic sealing sheet 701 is provided in the high-pressure pipe 7, and the water storage tank 2 passes th...

Embodiment 2

[0057] The reaction was carried out using the above system:

[0058] (1) At room temperature (25°C), take 7.34g of red-based KD in a 500mL beaker, add 8.84g of concentrated hydrochloric acid (37%), 1000mL of deionized water, and stir to prepare a uniform red-based KD slurry;

[0059] (2) Take 2.20g of sodium nitrite solid in a 500mL beaker, add 500mL of deionized water, and stir until the sodium nitrite solid is completely dissolved to obtain a sodium nitrite solution;

[0060] (3) At normal temperature (25°C), use the third nitriding input pump 6 (peristaltic pump) to drive all the red-based KD slurry into the high-pressure tank, and then use the second nitriding input pump 5 (advection pump) and high pressure Tank 7 controls the flow rate of the red base KD slurry to be 15ml / min, uses the first nitriding input pump 4 (advection pump) to control the flow rate of the sodium nitrite solution to be 15ml / min, and the two solutions are respectively, simultaneously and continuously...

Embodiment 3

[0068] (1) At room temperature (25°C), take 7.34g of red-based KD in a 500mL beaker, add 8.84g of concentrated hydrochloric acid (37%), 1000mL of deionized water, and stir to prepare a uniform red-based KD slurry;

[0069] (2) Take 2.20g of sodium nitrite solid in a 500mL beaker, add 500mL of deionized water, and stir until the sodium nitrite solid is completely dissolved to obtain a sodium nitrite solution;

[0070] (3) At normal temperature (25°C), use the third nitriding input pump 6 (peristaltic pump) to drive all the red-based KD slurry into the high-pressure tank 7, and then use the second nitriding input pump 5 (advection pump) and High-pressure tank 7 controls the flow of red base KD slurry to be 30ml / min, and the sodium nitrite solution flow is controlled to be 30ml / min with the first nitriding input pump 4 (advection pump), and the two solutions are carried out in the membrane dispersion microreactor. Mix the reaction, carry out the homogeneous diazonium reaction (10...

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Abstract

The invention belongs to the field of pigment synthesis, and particularly relates to a production system and a process method for continuously preparing high-transparency and high-strength monoazo pigment in a micro-reactor. The method comprises the following steps: carrying out diazotization reaction on a hydrochloric acid solution of a diazo component and a sodium nitrite solution in a membranedispersion microreactor to generate a diazonium salt solution, adding a certain amount of acetic acid into the diazonium salt solution, and uniformly mixing to obtain a solution A; preparing a solution B from the coupling component, sodium hydroxide and vulcanized castor oil, carrying out coupling reaction on the solution B and the solution A in a microporous dispersion microreactor to generate apigment crude product, and further treating the pigment crude product to obtain a high-transparency and high-strength azo pigment product. According to the invention, continuous preparation of the monoazo pigment is realized by adopting the membrane dispersion microreactor and the microporous dispersion microreactor, the process is simple, the reaction period is short, and the reaction process iseasy to monitor and control; compared with other types of microreactors, the reactor provided by the invention has the advantages that the reaction yield is improved, the product purity is improved, the particle size of a pigment product generated through the reaction of the microreactor is smaller than that of a commercial standard substance, the particle size distribution is narrower, and the transparency and strength of the product are greatly improved.

Description

technical field [0001] The invention belongs to the field of pigment synthesis, and in particular relates to a production system and a process method for continuously preparing high-transparency and high-strength monoazo pigments in a microreactor. Background technique [0002] Azo pigments refer to a class of synthetic pigments containing azo groups in their molecules, accounting for about 40% of the total organic pigments. Because of their bright color, strong tinting power, low density, and good light resistance, they are widely used in In coatings, rubber, plastics, paper, stationery and cosmetics. For example, Pigment Red 146, a representative monoazo pigment, is widely used in plastics, rubber, coatings, and inks. It is a monoazo pigment with great market influence and strong technical representativeness. Its continuous production technology can Promote and apply to the production of other azo pigments. [0003] The production process of azo pigments mainly involves ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B29/01C09B29/20
CPCC09B29/0838C09B29/20
Inventor 鄢冬茂徐建鸿周川王法军刘东黄晋培杨林涛胥维昌龚党生张学龙刘冰闫士杰
Owner SHENYANG RES INST OF CHEM IND
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