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A device for preparing stilbene bistriazine granular fluorescent whitening agent and its preparation method

A technology of fluorescent whitening agent and bistriazines, which is applied in the direction of styrene-based dyes, chemical instruments and methods, organic dyes, etc., can solve the problems of complex wastewater treatment procedures, high engineering investment, and high treatment costs, and achieve improvement Effect of reaction, simplification of process, and effect of increasing specific surface area

Active Publication Date: 2018-12-14
山西青山化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the shortcoming of this process is that the molecule of stilbene bistriazine fluorescent whitening agent contains several water-soluble sulfonic acid groups, which makes it have a certain solubility in water. During the liquid separation process, part of the product will be lost with the waste water, resulting in loss
In addition, 5-10 tons of wastewater needs to be discharged for every ton of fluorescent whitening agent produced. Since this wastewater is a typical fine chemical wastewater, its chemical oxygen consumption (CODCr) is generally above 4000mg / L, and the ratio of BOD5 / CODCr is generally If it is less than 0.2, the biodegradability is poor, and the salt content in the wastewater is above 1%, so the treatment process of this type of wastewater is relatively complicated, and even strong electrolysis, Fenton oxidation, ozone and various biochemical treatment units are used to treat this type of wastewater. The project investment of similar sewage is very high, and the cost of wastewater treatment per ton is also very high, generally above 35 yuan / ton

Method used

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  • A device for preparing stilbene bistriazine granular fluorescent whitening agent and its preparation method
  • A device for preparing stilbene bistriazine granular fluorescent whitening agent and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] A device for preparing a stilbene bistriazine particle type fluorescent whitening agent, comprising three sections: a first shrinking section, a second shrinking section and a third shrinking section; the first shrinking section includes a first reaction kettle, a first The water pump, the DSD acid homogenizer, the cyanuric chloride homogenizer, the first circulation channel formed by the first reaction chamber, the first acid binding agent metering tank and the crushed ice metering tank are connected to the first reaction chamber; the second shrinking section includes sequence The connected second reaction kettle, the second water pump, the second circulation channel formed by the second reaction chamber, the second acid binding agent metering tank and the second shrinkage raw material metering tank are connected to the second reaction chamber; The third circulation channel formed by the reaction kettle, the third water pump and the third reaction chamber, the third aci...

Embodiment 2

[0022] A method for preparing a stilbene bistriazine particle type fluorescent whitening agent using the device in Example 1, under stirring, 1300kg of water and 2300kg of borneol were added to a 15m 3 After mixing in the first reaction chamber, start the first water pump, fill the first circulation channel with 0°C ice-water mixture, turn on the power of the DSD acid homogenizer and the cyanuric chloride homogenizer, and transfer the 1000kg DSD acid powder required for the reaction. and 1000kg of cyanuric chloride are successively added into their respective homogenizers for high-speed grinding and dispersion. The ice water in the loop first flows through the DSD acid homogenizer, then flows through the cyanuric chloride homogenizer, and flows through the 250L first reaction. When the material reaches the first reaction chamber, open the high-level tank valve of the soda ash aqueous solution (the first acid binding agent metering tank), drop the soda ash aqueous solution into ...

Embodiment 3

[0025] A method for preparing a stilbene bistriazine particle type fluorescent whitening agent using the device in Example 1, under stirring, 1300kg of water and 2300kg of borneol were added to a 15m 3 After mixing in the first reaction chamber, start the first water pump, fill the first circulation channel with 0°C ice-water mixture, turn on the power of the DSD acid homogenizer and the cyanuric chloride homogenizer, and transfer the 1000kg DSD acid powder required for the reaction. and 1000kg of cyanuric chloride are successively added into their respective homogenizers for high-speed grinding and dispersion. The ice water in the loop first flows through the DSD acid homogenizer, then flows through the cyanuric chloride homogenizer, and flows through the 250L first reaction. When the material reaches the first reaction chamber, open the high-level tank valve of the soda ash aqueous solution (the first acid binding agent metering tank), drop the soda ash aqueous solution into ...

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Abstract

The invention belongs to the technical field of fluorescent whitening agent preparation, and particularly relates to a device for preparing a toluylene bis(triazinyl) particular fluorescent whitening agent in a zero-waste-water-discharge manner and a preparation method thereof. The device for preparing the toluylene bis(triazinyl) particular fluorescent whitening agent is characterized in that the water putting quantity is reduced in a first condensing work section, a second condensing work section and a third condensing work section through circular reaction; meanwhile, in the first condensing work section, DSD acid powder is directly fed without dissolution, so that the zero waste water discharge in the reaction system is realized; after the third condensing reaction is completed, the pressure spraying drying is directly performed. The invention also relates to a method for concretely preparing the toluylene bis(triazinyl) particular fluorescent whitening agent by using the device.

Description

technical field [0001] The invention belongs to the technical field of preparation of fluorescent whitening agents, in particular to a device for preparing stilbene bistriazine particle-type fluorescent whitening agents with zero waste water discharge and a preparation method thereof. Background technique [0002] Stilbene bistriazine fluorescent whitening agent is the most widely used type of fluorescent whitening agent in the family, and it is conservatively estimated to account for no less than 60%. It is widely used in synthetic detergents, papermaking, printing and dyeing and other fields. Its current production process is as follows: (1) Condensation reaction: add bottom water in the reaction kettle, start the stirring paddle, put in crushed ice, add cyanuric chloride, emulsify for 1 hour, and then evenly add the pre-prepared concentration 10%- 15% aqueous solution of 4,4'-diaminostilbene-disulfonic acid (DSD acid) sodium salt, add acid binding agent such as 10% soda a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B23/14C09B67/02C09B67/06
CPCC09B23/148C09B67/0003C09B67/0097
Inventor 甘宏宇季东峰王真祥王刚
Owner 山西青山化工有限公司
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