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Preparing method of stilbene biphenyl fluorescent brightener

A technology of stilbene biphenyls and fluorescent whitening agents, which is applied in the preparation of detergent mixture compositions, chemical instruments and methods, and preparation of detergents by chemical methods, can solve the problems of precipitation and low solubility, and achieve The effect of reducing production costs

Active Publication Date: 2012-06-27
ZHEJIANG HONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main component of fluorescent whitening agent used in liquid detergent is 4,4'-bis-(2-sodium styryl sulfonate) biphenyl, its solubility (25°C) is 15g / l-25g / l, In the production process of liquid detergent, the concentration of the prepared solution is required to be between 45-50g / l. Due to the low solubility of the optical brighteners currently on the market, it is required to raise the temperature in the process of preparing the solution. When the temperature reaches 60-70°C, the container of the prepared solution also requires good heat preservation, so as to prevent the solute from being precipitated in the solution after the temperature drops.

Method used

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  • Preparing method of stilbene biphenyl fluorescent brightener

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Embodiment 1

[0023] A preparation method of highly water-soluble stilbene biphenyl fluorescent whitening agent, characterized in that: the preparation method comprises the following steps:

[0024] (1) The active ingredients are 4,4'-bis-(2-sodium styryl)biphenyl and 4,4'-bis-(4-sodium styryl)biphenyl 1:1 500 kg of filter cake (wherein the solid content is 55%) is subjected to secondary refining of desalination: first place the filter cake in a reaction kettle, add 1500 kg of distilled water, and add 40 kg of monoethanolamine, heat until completely dissolved, and then heat filter , freeze to 5°C, precipitate crystals, press filter to obtain a cake filter; then put the cake filter into a reaction kettle, add 2000 kg of ethanol, first heat and reflux for 1 hour, then freeze to 5°C, precipitate crystals, press filter out and filter Cake is 450 kilograms (solid content 52%), and the salt content of this filter cake is 0.4%;

[0025] (2) The stage of beating the filter cake in the above step: ...

Embodiment 2

[0029] A preparation method of highly water-soluble stilbene biphenyl fluorescent whitening agent, characterized in that: the preparation method comprises the following steps:

[0030] (1) 50 wt% of 4,4'-bis-(2- Sodium sulfonate styryl) biphenyl 25wt%, 4,4'-bis-(4-sulfonate styryl) biphenyl 25wt% filter cake 500 kilograms (wherein solid content 55%) carry out desalination secondary Refining: first put the filter cake in a reaction kettle, add 1500 kg of distilled water, and add 40 kg of diethanol, heat until completely dissolved, heat filter, freeze to 5°C, precipitate crystals, press filter to obtain cake filter; The cake filter is put into the reaction kettle, 2000 kilograms of ethanol is added, heated and refluxed for 1 hour, then frozen to 5° C., crystals are precipitated, and 445 kilograms (solid content 53%) of the filter cake are filtered out by pressure filtration. The salt content of the filter cake is 0.35%;

[0031] (2) The stage of beating the filter cake in the ...

Embodiment 3

[0035] A preparation method of highly water-soluble stilbene biphenyl fluorescent whitening agent, characterized in that: the preparation method comprises the following steps:

[0036] (1) The active ingredient is 4-(2-sodium styryl sulfonate)-4'-(4-sodium styryl sulfonate)-biphenyl 40wt%, 4,4'-bis-(2-sulfonate Sodium styrene-acid styrene base) biphenyl 30wt%, 4,4'-bis-(4-sodium sulfonate styryl) biphenyl 30wt% filter cake 500 kilograms (wherein solid content 55%) carries out the secondary refining of desalination : First place the filter cake in a reaction kettle, add 1500 kg of distilled water, and add 40 kg of monoethanolamine, heat until completely dissolved, heat filter, freeze to 5°C, precipitate crystals, press filter to obtain cake filter; Put the cake filter into the reaction kettle, add 2000 kg of methanol, heat and reflux for 1 hour, then freeze to 5 ° C, crystals are precipitated, and the filter cake is 450 kg (solid content 52%) by pressure filtration. 0.4%;

[...

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Abstract

A preparing method of a stilbene biphenyl fluorescent brightener comprises performing desalting secondary refining to a filter cake containing the stilbene biphenyl fluorescent brightener; pulping the filter cake; homogenizing serosity through a colloid mill or a high-pressure homogenizer so as to guarantee that fineness of particles in the serosity is 10-100mum; and finally performing spray drying to the serosity to obtain a product. Effective component(s) of the filter cake containing the stilbene biphenyl fluorescent brightener is / are one of or a mixture of a plurality of sulfonyl styryl biphenyl compounds. The preparing method enables the fluorescent brightener having high water solubility at a normal temperature to be obtained, and has the effects of saving energy and reducing production cost.

Description

technical field [0001] The invention relates to a preparation method of a distyryl biphenyl fluorescent whitening agent. Background technique [0002] With the continuous improvement of the living standards of urban and rural residents, the demand for liquid detergents is constantly increasing. At present, the main component of fluorescent whitening agent used in liquid detergent is 4,4'-bis-(2-sodium styryl sulfonate) biphenyl, its solubility (25°C) is 15g / l-25g / l, In the production process of liquid detergent, the concentration of the prepared solution is required to be between 45-50g / l. Due to the low solubility of the optical brighteners currently on the market, it is required to raise the temperature in the process of preparing the solution. When the temperature reaches 60-70°C, the container of the prepared solution also requires good heat preservation, so as to prevent the solute from being precipitated in the solution after the temperature drops. Contents of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D11/00C11D11/02C11D9/44C11D3/42
Inventor 王国森容建明诸建鑫赖瑞全
Owner ZHEJIANG HONGDA CHEM
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