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Method for efficiently preparing naphthalene sulfonic acid sodium formaldehyde condensate

A technology of sodium naphthalene sulfonate formaldehyde and condensate, which is applied in the chemical industry, can solve the problem of many by-products of naphthalene-based sodium sulfonate formaldehyde condensate, and achieve the effects of reducing sulfonated by-products, less by-products, and process safety

Pending Publication Date: 2021-04-30
于广臣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Yet the by-product of naphthalene series sodium sulfonate formaldehyde condensate is still more, how to provide a kind of process safety, simple, efficient, the preparation method of the naphthalene series sodium sulfonate formaldehyde condensate with few by-products is still urgent for those skilled in the art problem to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for efficiently preparing sodium naphthalenesulfonate formaldehyde condensate, specifically comprising the steps:

[0023] (1) Sulfonation: Put refined naphthalene into the first stirred tank, control the temperature of the tank at 65°C, put concentrated sulfuric acid with a mass fraction of 98% into the second stirred tank, and inject the refined naphthalene and concentrated sulfuric acid into the tank at the same time with a push injection pump. In the spiral tube reactor, the temperature of the reactor was controlled at 145° C. to react to prepare a sulfonated liquid, and the sulfonated liquid stayed in the reactor for 6 minutes, wherein the ratio of refined naphthalene to sulfuric acid was 1:1.35;

[0024] (2) Condensation: put the sulfonated liquid into the third stirring tank, add an appropriate amount of water to adjust the acidity to 30%, put the formaldehyde solution with a mass concentration of 37.5% into the fourth stirring tank, and use a push inject...

Embodiment 2

[0028] A method for efficiently preparing sodium naphthalenesulfonate formaldehyde condensate, specifically comprising the steps:

[0029] (1) Sulfonation: Put the refined naphthalene into the first stirred tank, control the temperature of the tank at 60°C, put concentrated sulfuric acid with a mass fraction of 96% into the second stirred tank, and inject the refined naphthalene and concentrated sulfuric acid into the tank at the same time with a push injection pump. In the helical tubular reactor, control the temperature of the reactor at 140° C. to react, and stay in the reactor for 7 minutes to prepare a sulfonated liquid, wherein the ratio of refined naphthalene to sulfuric acid is 1:1.3;

[0030] (2) Condensation: put the sulfonated liquid into the third stirring tank, add appropriate amount of water to adjust the acidity to 29%, put the formaldehyde solution with a mass concentration of 35% into the fourth stirring tank, and use a push injection pump to The sulfonation s...

Embodiment 3

[0034] A method for efficiently preparing sodium naphthalenesulfonate formaldehyde condensate, specifically comprising the steps:

[0035] (1) Sulfonation: Put refined naphthalene into the first stirred tank, control the temperature of the tank at 80°C, put concentrated sulfuric acid with a mass fraction of 98% into the second stirred tank, and inject the refined naphthalene and concentrated sulfuric acid into the tank at the same time with a push injection pump. In the helical tubular reactor, control the temperature of the reactor at 150° C. to react to prepare a sulfonated liquid, and stay in the reactor for 8 minutes, wherein the ratio of refined naphthalene to sulfuric acid is 1:1.4;

[0036] (2) Condensation: put the sulfonated liquid into the third stirred tank, add appropriate amount of water to adjust the acidity to 31%, put the formaldehyde solution with a mass concentration of 35% into the fourth stirred tank, and use a push injection pump to The sulfonation solutio...

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Abstract

The invention relates to a method for efficiently preparing a naphthalene sulfonic acid sodium formaldehyde condensate, the production process comprises the procedures of sulfonation, condensation, neutralization and drying, and the steps of sulfonation, condensation and neutralization are all completed in an internal spiral tube type reactor. Compared with the prior art, the naphthalene sulfonic acid sodium formaldehyde condensate is prepared by adopting the internal spiral tubular reactor in a continuous flow manner, so that the reaction material amount, the reaction temperature and the reaction time can be accurately controlled, the mass transfer and heat transfer efficiency is very high, and sulfonation of concentrated sulfuric acid with equal molar weight is realized; sulfonated by-products generated by excessive concentrated sulfuric acid or uneven material mixing can be effectively reduced. According to the method, the preparation process conditions are deeply explored, the optimal process parameters are found, the naphthalene sulfonic acid sodium formaldehyde condensate can be efficiently prepared under the process conditions, byproducts are few, and the process is safe, simple and efficient.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for efficiently preparing sodium naphthalenesulfonate formaldehyde condensate. Background technique [0002] Sodium naphthalenesulfonate formaldehyde condensate (dispersant N) is an anionic surfactant, mainly used as a dispersant in disperse dyes, vat fuels, reactive dyes, acid dyes and leather dyes. It can also be used as a dispersant for textile printing and dyeing, wettable pesticides, dispersants for papermaking, electroplating additives, water-soluble paints, pigment dispersants, water treatment agents, carbon black dispersants, etc. Dispersant N is also used industrially for vat dye suspension pad dyeing, leuco acid dyeing, dispersive and soluble vat dye dyeing, etc. It can also be used for dyeing silk / wool interwoven fabrics, so that there is no color on the silk. In the dye industry, it is used as a diffusion aid in the manufacture of dispersion and c...

Claims

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Application Information

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IPC IPC(8): C07C303/32C07C303/44C07C303/06C07C309/35B01F17/12B01J19/24C09K23/12
CPCC07C303/32C07C303/44C07C303/06B01J19/243C09K23/00C07C309/35
Inventor 于广臣吴国军马艳冬吴威
Owner 于广臣
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