Flocculating agent as well as preparation method and application thereof

The technology of a flocculant and a crosslinking agent is applied in the field of flocculant and its preparation, which can solve the problems of unfavorable industrialization, complicated and complicated operation steps, etc., and achieve the effects of increasing cationic charge, improving flocculation efficiency, and improving flocculation effect.

Active Publication Date: 2021-07-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the operation steps of this patent are relatively cumbersome and complicated, which is not conducive to industrialization

Method used

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  • Flocculating agent as well as preparation method and application thereof
  • Flocculating agent as well as preparation method and application thereof
  • Flocculating agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Firstly, 20 g of potato starch and 200 g of deionized water were weighed and put into a three-neck flask with a stirrer, nitrogen was introduced for protection, and gelatinized in a water bath at a constant temperature of 90° C. for 40 minutes to obtain gelatinized starch.

[0060] Take 10g of N-methyldiallylpropanesulfonate and put it into a beaker, add 70g of deionized water, add sodium hydroxide to adjust the pH to 8, and stir magnetically in the beaker for 1h to obtain N-methyldiallyl Propanesulfonate aqueous solution.

[0061] Cool the gelatinized starch in the three-necked flask to 50°C, add 0.45 g of potassium persulfate and stir for 30 minutes, then add the prepared N-methyldiallylpropane sulfonate aqueous solution, and continue stirring for 4 hours to obtain graft copolymerization Modified starch solution.

[0062] At the same time, take 10.3g of diethylenetriamine and 8.8g of ethylene oxide into a round-bottomed flask with a stirrer in turn, react for 1h unde...

Embodiment 2

[0066] Firstly, 10 g of cornstarch and 150 g of deionized water were weighed and put into a three-necked flask with a stirrer, and nitrogen gas was introduced for protection, and gelatinized in a water bath at a constant temperature of 90° C. for 30 minutes to obtain gelatinized starch.

[0067] Take 10g of N-methyldiallylpropanesulfonate and put it into a beaker, add 50g of deionized water, add potassium hydroxide to adjust the pH to 8, and stir magnetically in the beaker for 30min to obtain N-methyldiallyl Propanesulfonate aqueous solution.

[0068] Cool the gelatinized starch in the three-necked flask to 50°C, add 0.15 g of potassium persulfate and stir for 5 minutes, then add the prepared N-methyldiallyl propane sulfonate aqueous solution, and continue stirring for 4 hours to obtain graft copolymerization Modified starch solution.

[0069] At the same time, 6 g of ethylenediamine and 11.6 g of propylene oxide were successively added to a round-bottomed flask with a stirre...

Embodiment 3

[0073] Firstly, 30 g of cornstarch and 150 g of deionized water were weighed and added into a three-neck flask with a stirrer, nitrogen gas was introduced for protection, and gelatinization was carried out in a water bath at a constant temperature of 95° C. for 50 minutes to obtain gelatinized starch.

[0074] Take 10g of N-methyldiallyl butanesulfonate and put it into a beaker, add 50g of deionized water, add sodium hydroxide to adjust the pH to 9, and stir magnetically in the beaker for 30min to obtain N-methyldiallyl Butane sulfonate aqueous solution.

[0075] Cool the gelatinized starch in the three-necked flask to 60°C, add 0.3 g of potassium persulfate and stir for 15 minutes, then add the prepared N-methyldiallyl butanesulfonate aqueous solution, and continue stirring for 5 hours to obtain graft copolymerization Modified starch solution.

[0076] At the same time, 10 g of triethylenetetramine and 12 g of propylene oxide were successively added to a round-bottomed flask...

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Abstract

The invention discloses a flocculating agent and a preparation method and application thereof. The flocculating agent comprises a starch structural unit, a zwitterionic monomer structural unit, a polyether structural unit and a cross-linking agent structural unit, and the preparation method comprises the steps that zwitterionic graft copolymerization modified starch, polyether and water are mixed evenly, and then a cross-linking agent is dropwise added for a cross-linking reaction; and association reaction is conducted on the obtained cross-linked product and an inorganic salt solution to obtain the flocculating agent. The modified starch flocculant prepared by the invention has the advantages of quick flocculation effect, low biotoxicity, low cost and the like, and the removal rate of COD (Chemical Oxygen Demand), turbidity and suspended matter can reach 90% or above at a relatively low use amount.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a flocculant and its preparation method and application. Background technique [0002] Flocculation is a commonly used method of water purification, which is involved in sewage treatment in many industries, such as petrochemical, papermaking, hydrometallurgy, steel, textile, printing and dyeing, brewing, food, etc. The core of flocculation technology for sewage treatment is flocculant. The main function of the flocculant is to coagulate the colloidal particles in the sewage through charge neutralization and adsorption bridging, and then remove them through gravity sedimentation and filtration. Flocculants are mainly divided into three categories: inorganic flocculants, organic flocculants and biological flocculants. The cost of inorganic flocculants is low, but there are problems such as large usage and low efficiency; the characteristics of organic floccu...

Claims

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Application Information

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IPC IPC(8): C02F1/56C08J3/24C08L51/02C08L71/02
CPCC02F1/56C08J3/24C08J2351/02C08J2471/02C08J2371/02C08J2451/02Y02W10/10
Inventor 赵凯强杨超韩照明杨国兴王晨周成华
Owner CHINA PETROLEUM & CHEM CORP
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