Method for supercritical synthesis of cationic polyamidine flocculating agent

A cationic polymerization and supercritical technology, applied in the direction of flocculation/sedimentation water/sewage treatment, bulk chemical production, etc., can solve the problems of multiple temperature conditions of impurities, poor effect, low yield, etc., and achieve high purity of polyamidine , wide application range, high molecular weight effect

Active Publication Date: 2017-05-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flocculant can play a certain effect in the treatment of oilfield wastewater, but the effect is not very good, and the preparation method is carried out in aqueous solution, which has the disadvantages of low yield and difficult temperature control due to many impurities.

Method used

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  • Method for supercritical synthesis of cationic polyamidine flocculating agent
  • Method for supercritical synthesis of cationic polyamidine flocculating agent
  • Method for supercritical synthesis of cationic polyamidine flocculating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for supercritical synthesis of cationic polyamidine flocculants, the steps are as follows:

[0039]1. Measure 3.4mL of NVF and 3.1ml of AN in the supercritical reactor, pass nitrogen gas for 15min to remove oxygen, add 5mL of 0.3% AIVN methanol solution, close the reactor and connect it to the carbon dioxide pipeline for flushing, and discharge the air. Put the device in a constant temperature box, set the constant temperature to 55°C, fill with carbon dioxide gas, pressurize to 15MPa, make the carbon dioxide enter a supercritical state, and react for 30 minutes. Reduce the pressure and discharge carbon dioxide to obtain a copolymer.

[0040] 2. Add the copolymer to 8mL of concentrated hydrochloric acid and 20g of ultrapure water, place it in an oil bath at 100°C and continue stirring for 4 hours to prepare polyamidine. After cooling, the obtained product was washed with acetone solution to precipitate a solid product, which was placed in a vacuum oven and dri...

Embodiment 2

[0042] With the method for the supercritical synthesis cationic polyamidine flocculant described in embodiment 1, difference is:

[0043] Step (1) The constant temperature is 50°C, filled with carbon dioxide gas, and pressurized to 20MPa;

[0044] Step (2) The copolymer was added to 8 mL of concentrated hydrochloric acid and 20 g of ultrapure water, placed in an oil bath at 110° C. and continuously stirred for 4 h.

Embodiment 3

[0046] With the method for the supercritical synthesis cationic polyamidine flocculant described in embodiment 1, difference is:

[0047] Step (1) The constant temperature is 60°C, filled with carbon dioxide gas, and pressurized to 18MPa;

[0048] Step (2) The copolymer was added to 8 mL of concentrated hydrochloric acid and 20 g of ultrapure water, placed in an oil bath at 105° C. and continuously stirred for 5 h.

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Abstract

The invention relates to a method for supercritical synthesis of a cationic polyamidine flocculating agent. The method comprises the following steps of performing copolymerization by using methanamide (NVF) and acrylonitrile (AN) as raw materials; preparing polymers through supercritical reaction; performing acidification amidine reaction to obtain annular polyamidine. The polyamidine flocculating agent synthesized by a supercritical method has the advantages of high molecular weight, high positive charge density and high thermal stability; the proceeding in the water solution is performed; impurities are fewer; the polyamidine purity is high; the molecular weight is high; the positive charge density is high; the flocculation effect is good; the method is used for treating sewage, the removal efficiency is high; the flco bodies are great; the sedimentation speed is high; the treatment effect on various kinds of sewage is good; the use range is wide; particularly, the treatment effect on oil-containing waste water is the best.

Description

technical field [0001] The invention relates to a method for supercritically synthesizing a cationic polyamidine flocculant, which belongs to the technical field of environmental chemical water treatment. Background technique [0002] In recent years, the rapid development of industry has brought about an increase in the use of oil products. However, due to technological development that cannot meet the demand and improper management, a large amount of oil products have entered water bodies, forming oily wastewater to pollute the environment. At the same time, in addition to the large output, the oily wastewater has a wide range of sources. For example, a large amount of oily wastewater will be generated in the process of oil extraction, oil refining, oil storage, transportation and petrochemical industry production. The multiple sources of oily wastewater lead to very complex types and properties of wastewater. According to the state of oil in oily wastewater, it is general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/02C08F220/44C08F8/48C08F2/06C02F1/56
CPCC02F1/56C08F2/06C08F8/48C08F226/02C08F220/44Y02P20/54
Inventor 高宝玉薛墨溪沈雪徐婕岳钦艳
Owner SHANDONG UNIV
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