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Cationic flocculant based on collagen modification and preparation method thereof

A cationic flocculant and collagen technology, applied in the field of collagen-modified cationic flocculants and their preparation, can solve the problems of strong toxicity, carcinogenicity, environmental pollution and high preparation cost of synthetic or degraded products, and achieve biodegradability. And the effect of good biocompatibility, improved complexation and good application prospect

Active Publication Date: 2012-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a cationic flocculant based on collagen modification and its preparation method, so as to solve the existing preparation cost of flocculants in the current waste drilling fluid treatment process Higher, synthetic or degradation products are highly toxic and carcinogenic, and will cause serious pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method based on collagen-modified cationic flocculants, comprising the steps of:

[0021] Step 1: Prepare industrial gelatin into a solution with a mass fraction of 15%, hydrolyze it with trypsin as a hydrolyzing agent, control the amount of trypsin to be 1.5% of the mass of industrial gelatin, react at a temperature of 37°C, and heat up to 100°C after 3 hours of reaction Inactivate the enzyme to obtain a collagen solution.

[0022] Step 2: In the obtained collagen solution, adding mass fraction is 40% glyoxylic acid, the mass ratio of collagen solution and glyoxylic acid is 1: 1 (on the dry basis of collagen), adding alkali to adjust the solution The pH was 7, and reacted at 30°C for 4 hours. After the reaction, unreacted glyoxylic acid was removed in a rotary evaporator at 110°C to obtain modified collagen.

[0023] Step 3: complex the modified collagen obtained in step 2 with ferric sulfate according to a mass ratio of 1:2 (based on the dry basis of th...

Embodiment 2

[0025] A preparation method based on collagen-modified cationic flocculants, comprising the steps of:

[0026] Step 1: Prepare industrial gelatin into a solution with a mass fraction of 15%, hydrolyze it with trypsin as a hydrolyzing agent, control the amount of trypsin to be 1.5% of the mass of industrial gelatin, react at a temperature of 37°C, and heat up to 100°C after 3 hours of reaction Inactivate the enzyme to obtain a collagen solution.

[0027] Step 2: Add carbodiimide to 2% gallic acid solution, react at room temperature for 20 minutes, and then add collagen solution to it to increase the content of phenolic hydroxyl groups on collagen molecules and enhance its ability to complex metal ions , control the mass ratio of gallic acid, carbodiimide and collagen solution to 0.9:1.1:1 (based on the dry basis of gallic acid and collagen), add alkali to adjust the pH of the solution to 4.5, and react at 15°C for 5h, Obtain modified collagen.

[0028] Step 3: complex the mod...

Embodiment 3

[0030] A preparation method based on collagen-modified cationic flocculants, comprising the steps of:

[0031] Step 1: Prepare industrial gelatin into a solution with a mass fraction of 15%, hydrolyze it with trypsin as a hydrolyzing agent, control the amount of trypsin to be 1.5% of the mass of industrial gelatin, react at a temperature of 37°C, and heat up to 100°C after 3 hours of reaction Inactivate the enzyme to obtain a collagen solution.

[0032] Step 2: In the collagen solution, add glyoxylic acid with a mass fraction of 40%, the mass ratio of the collagen solution to the glyoxylic acid is 1:2 (based on the dry basis of the collagen), and the pH of the solution is adjusted to be 6 by adding alkali. , reacted at 50° C. for 2 h, and after the reaction was completed, unreacted glyoxylic acid was removed in a rotary evaporator at 130° C. to obtain modified collagen.

[0033] Step 3: complex the modified collagen obtained in step 2 with aluminum sulfate according to a mass...

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Abstract

The invention relates to a cationic flocculant based on collagen modification and a preparation method thereof. The cationic flocculant is prepared through the following steps of: 1) taking trypsin as hydrolytic agent to hydrolyze industrial gelatine to obtain collagen solution; 2) using glyoxylic acid or gallic acid to modify the obtained collagen solution aiming at increasing the content of carboxyl groups or phenolic hydroxyl groups on collagen molecules to obtain modified collagen solution; and 3) conducting complexation to the obtained modified collagen solution and ferric sulfate or aluminum sulfate according to mass ratio being 1:2 to 1:4 to obtain the cationic flocculant based on the collagen modification. The cationic flocculant can be used for treating waste drilling fluid and solves the problems that the preparation cost of the existing flocculant is high, the synthesized or degraded products are highly toxic and carcinogenic and serious environmental pollution is caused during the current treatment of the waste drilling liquid.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of oil field waste drilling fluid, in particular to a cationic flocculant based on collagen modification and a preparation method thereof. Background technique [0002] With the rapid development of industry, petroleum has become one of the most important energy sources, and the pollution caused by its exploitation has also attracted widespread attention. In the process of oil exploration, waste drilling fluid is an inevitable product, and its harm to the ecological environment and human health is mainly manifested in the following three aspects: First, waste drilling mud is difficult to degrade in the natural state, and accumulation will cause soil compaction in surrounding areas , so that the land loses its use value due to salinization and becomes a new source of pollution; second, it will seep into the subsurface water layer or flow into rivers and streams, pollute water sources, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 张莎王学川任龙芳强涛涛
Owner SHAANXI UNIV OF SCI & TECH
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