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Method for direct extracting 4,4-bi(4,6 diammine-1,3,5 triazine-2-amido) diphenyl ethylene sodium disulfonate

A technology of stilbene and sodium disulfonate, which is applied in the direction of organic chemistry, can solve problems such as the need to neutralize emissions, environmental pollution, and increase costs, and achieve the effects of reducing investment, eliminating environmental pollution, and reducing loss processes

Inactive Publication Date: 2006-01-11
逯文启
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method uses both acid and alkali, and finally needs to be neutralized and discharged, which wastes resources and increases costs, and also causes environmental pollution

Method used

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  • Method for direct extracting 4,4-bi(4,6 diammine-1,3,5 triazine-2-amido) diphenyl ethylene sodium disulfonate
  • Method for direct extracting 4,4-bi(4,6 diammine-1,3,5 triazine-2-amido) diphenyl ethylene sodium disulfonate

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Embodiment Construction

[0013] Such as figure 2 As shown, after the usual three-step condensation of VBL, the solution is passed into an enamel crystallization kettle, which is equipped with a serpentine cooling tube and a paddle stirrer, and the crystallization is stirred at a temperature below 100°C, and the crystallized suspension is The solution was filtered through plate and frame to separate VBL. The mother liquor after VBL extraction is processed by nanofiltration membrane technology. The nanofiltration membrane is made of aromatic polyamide composite material. The temperature is 80°C, the cut-off molecular weight is 400-1000, and the operating pressure is 3.5mPa. The residual VBL and nanofiltration membrane are recovered. The dialysis water is discharged directly. The recovered VBL concentrate is returned to the crystallization tank for recrystallization. The products after plate and frame filtration become semi-finished products after being dried.

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Abstract

This invention relates to prodn. of 4,4-bis(4,6-diamino-1,3,5-triazinyl-2-amino) styryl disulfonic sodium after three steps condensations, then proceeding procedures of: crystallization, filtration, acceptance filtration and drying. Said crystallization equipment must be made of no iron, being made of plastic-steel or enamel, being equiped with agitator, heat-exchanger to let VBL crystallized. Said ste acceptance filtration, aromatic type polyamide compounding materials can be used, when temp. of 90 deg.C, pressure of 2-4 MPa, entrapping molecular wt. of 400-1000. This invention has advantages of: short process, no need of procedures of acid separation and alkali dissolution, low materials loss, high yield.

Description

technical field [0001] The present invention relates to a kind of extraction method of whitening agent, relate in particular to 4,4'-bis(4,6-diamine-1,3,5-triazinyl-2-amino)stilbene disulfonate sodium directly method of extraction. Background technique [0002] 4, 4`-bis(4,6-diamine-1,3,5-triazinyl-2-amino)stilbene disulfonate sodium (VBL), also known as optical bleaching agent and brightener, is a dye family It is a series of varieties among which can not only whiten the dyed object, but also brighten the dyed object. VBL is mainly used in the three major fields of textile printing and dyeing, papermaking and synthetic detergent ingredients. [0003] VBL is formed by three-step condensation of main raw materials such as 4,4`-diaminostilbene-2,2`-sulfonic acid (DSD), cyanuric chloride, aniline and ethanolamine, and then VBL is made from the condensation reactant Extracted, the extracted VBL is formulated into commercial varieties with different con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/54
Inventor 逯文啟
Owner 逯文启