CN-121990659-A - Decolorizing flocculant and preparation method thereof

Abstract

The invention discloses a decolorizing flocculant and a preparation method thereof, and belongs to the technical field of water treatment. The decolorizing flocculant comprises the following raw materials, by weight, 20-25 parts of ethylenediamine modified dicyandiamide formaldehyde, 12-15 parts of an aluminum-titanium-based polymer and 4-5 parts of a polymeric ferric sulfate-polyacrylamide compound. The invention also discloses a preparation method of the decolorizing flocculant. The decoloring flocculant prepared by the method can fully exert the synergistic effect among the components, can realize the rapid formation and sedimentation of floccules, reduce the dye content in high-chromaticity wastewater, greatly reduce chromaticity, and has the decoloring rate of more than 99.02 percent, and meanwhile, the decoloring flocculant has wide applicability, so that the decoloring flocculant can exert good decoloring and flocculating effects in water with complex components.

Inventors

• CHEN XI
• ZHANG SHUDE
• YUN JIAN
• WU QIAN
• LI CHUNXIAO
• ZHANG XIAOLONG
• LI YING
• YANG ZHONGPING
• WANG ZHANSHENG
• WANG LIRONG
• LI KAI
• JIAO WEI
• WANG YIHAN
• CHEN HONGKUN

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团安全环保技术研究院有限公司
• 北京中油爱索节能环保技术有限公司

Dates

Publication Date

20260508

Application Date

20241104

Claims (12)

1. 1. The decolorizing flocculant is characterized by comprising the following raw materials in parts by weight: 20-25 parts of ethylenediamine modified dicyandiamide formaldehyde, 12-15 parts of aluminum-titanium based polymer and 4-5 parts of polymeric ferric sulfate-polyacrylamide compound.
2. 2. The decolorizing flocculant according to claim 1, wherein the decolorizing flocculant comprises the following raw materials, by weight, 22-25 parts of ethylenediamine modified dicyandiamide formaldehyde, 12-14 parts of an aluminum-titanium-based polymer, and 4.5-5 parts of a polymeric ferric sulfate-polyacrylamide compound.
3. 3. A method for preparing a decolorizing flocculant according to claim 1 or 2, comprising the step of uniformly mixing ethylenediamine modified dicyandiamide formaldehyde, an aluminum titanium base polymer and a polymeric ferric sulfate-polyacrylamide compound to obtain the decolorizing flocculant.
4. 4. A method for preparing a decolorizing flocculant according to claim 3, wherein the method for preparing ethylenediamine modified dicyandiamide formaldehyde comprises mixing dicyandiamide, formaldehyde and half of ammonium chloride, stirring and heating, adding the rest of ammonium chloride to continue heating reaction, dropwise adding ethylenediamine to react, and cooling to obtain ethylenediamine modified dicyandiamide formaldehyde.
5. 5. The method for preparing a decolorizing flocculant according to claim 4, wherein the mass ratio of dicyandiamide, formaldehyde, ammonium chloride and ethylenediamine is 1:0.8-0.82:0.5-0.52:0.07-0.09.
6. 6. The method for preparing a decolorizing flocculant according to claim 3, wherein the method comprises dispersing aluminum trichloride and titanium tetrachloride in a molar ratio of 0.5-5:1 in water, and carrying out electrodialysis reaction to obtain the aluminum-titanium-based polymer.
7. 7. The method for preparing a decolorizing flocculant according to claim 6, wherein the molar ratio of aluminum trichloride to titanium tetrachloride is 0.8-1.5:1.
8. 8. The method for preparing a decolorizing flocculant according to claim 6, wherein the method for preparing an aluminum-titanium-based polymer comprises the steps of: Preparing titanium tetrachloride solution; preparing an aluminum trichloride solution; and uniformly mixing the prepared titanium tetrachloride solution and the aluminum trichloride solution, and performing electrodialysis reaction to obtain the aluminum-titanium-based polymer.
9. 9. The method for preparing the decolorizing flocculant according to claim 8, wherein the preparing the titanium tetrachloride solution comprises slowly dripping titanium tetrachloride into water, suspending dripping when white flocs are generated in the water, continuing dripping after the white flocs disappear, continuing stirring during dripping, and continuing stirring after the titration is finished to obtain the titanium tetrachloride solution.
10. 10. The method for preparing a decolorizing flocculant according to claim 8, wherein the electrodialysis reaction is carried out under conditions of current intensity of 0.01A-0.02A and reaction time of 7h-9h.
11. 11. The method for preparing a decolorizing flocculant according to claim 3, wherein the method for preparing the polymeric ferric sulfate-polyacrylamide compound comprises the steps of mixing polymeric ferric sulfate and polyacrylamide in a weight ratio of 1:0.5-3, and grinding until the color of the system is not changed any more, thus obtaining the polymeric ferric sulfate-polyacrylamide compound.
12. 12. The method for preparing a decolorizing flocculant of claim 11, wherein the weight ratio of polymeric ferric sulfate to polyacrylamide is 1:1-2.

Description

Decolorizing flocculant and preparation method thereof Technical Field The invention relates to the technical field of water treatment, in particular to a decolorizing flocculant and a preparation method thereof. Background The oil-gas field development waste liquid is generally characterized by high chromaticity, and the high chromaticity waste water is difficult to degrade and has huge potential hazard to the environment and the ecological system. At present, common decoloring methods for high-chromaticity wastewater mainly comprise flocculation, microbial degradation, photocatalytic degradation, electrochemical treatment, ozonization treatment and the like. Among them, flocculation is considered as the most important decoloring method, which has the advantages of simple operation, high efficiency, low energy consumption, low cost and the like, and is used in large scale in pretreatment and primary treatment stages of high-chromaticity wastewater purification. Simply, a certain amount of decolorizing flocculant is added into the water body to adsorb dye molecules, and the lower layer of flocs are filtered out after stirring and sedimentation for a certain time to obtain supernatant, namely the effluent after the dye is effectively removed. However, in the dyeing industry, for example, in order to improve the stability and color fixing effect of the dye liquor, the factory may add inorganic salts, surfactants and other substances to the dye liquor in various amounts and in various types, and these substances may cause great fluctuation of the anion concentration in the dye liquor, which may affect the effect of the decolorizing flocculant. Therefore, it is now urgent to obtain a decolorizing flocculant having both wide applicability and high-efficient adsorptivity. Disclosure of Invention The invention aims to provide a decolorizing flocculant and a preparation method thereof, which are used for solving the technical problem of how to obtain the decolorizing flocculant with wide applicability and high-efficiency adsorptivity in the prior art. In order to achieve the above purpose, in one embodiment of the present invention, a decolorizing flocculant is provided, which comprises the following raw materials in parts by weight: 20-25 parts of ethylenediamine modified dicyandiamide formaldehyde, 12-15 parts of aluminum-titanium based polymer and 4-5 parts of polymeric ferric sulfate-polyacrylamide compound. According to one of the preferred schemes, the decolorizing flocculant comprises the following raw materials, by weight, 22-25 parts of ethylenediamine modified dicyandiamide formaldehyde, 12-14 parts of aluminum-titanium-based polymer and 4.5-5 parts of polymeric ferric sulfate-polyacrylamide compound. Based on the decolorizing flocculant disclosed by the invention, the invention also discloses a preparation method of the decolorizing flocculant, which comprises the following steps of uniformly mixing ethylenediamine modified dicyandiamide formaldehyde, an aluminum titanium base polymer and a polymeric ferric sulfate-polyacrylamide compound to obtain the decolorizing flocculant. According to one of the preferred schemes, the preparation method of the ethylenediamine modified dicyandiamide formaldehyde comprises the steps of mixing dicyandiamide, formaldehyde and half of ammonium chloride, stirring and heating, adding the rest of ammonium chloride for continuous heating reaction, dropwise adding ethylenediamine for reaction, and cooling to obtain the ethylenediamine modified dicyandiamide formaldehyde. In one of the preferred schemes of the invention, the mass ratio of dicyandiamide to formaldehyde to ammonium chloride to ethylenediamine is 1:0.8-0.82:0.5-0.52:0.07-0.09. According to one of the preferred schemes of the invention, the preparation method of the aluminum-titanium-based polymer comprises the steps of dispersing aluminum trichloride and titanium tetrachloride in a molar ratio of 0.5-5:1 in water, and carrying out electrodialysis reaction to obtain the aluminum-titanium-based polymer. In one of the preferred embodiments of the present invention, the molar ratio of aluminum trichloride to titanium tetrachloride is from 0.8 to 1.5:1. In one of the preferred embodiments of the present invention, a method for preparing an aluminum-titanium based polymer comprises: Preparing titanium tetrachloride solution; preparing an aluminum trichloride solution; and uniformly mixing the prepared titanium tetrachloride solution and the aluminum trichloride solution, and performing electrodialysis reaction to obtain the aluminum-titanium-based polymer. The preparation method of the titanium tetrachloride solution comprises the steps of slowly dripping titanium tetrachloride into water, suspending dripping when white floccules are generated in the water, continuing dripping after the white floccules disappear, continuously stirring in the dripping process, and continuously stirring after the titration is finished to