Method for preparing amphiprotic sludge dehydrant

A kind of sludge dehydrating agent, amphoteric technology, applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve environmental pollution and other problems, achieve good treatment effect, stable reaction process and short time

Active Publication Date: 2008-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there are organic substances that are not easily biodegradable in oily sludge, this method will cause certain environmental pollution

Method used

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  • Method for preparing amphiprotic sludge dehydrant
  • Method for preparing amphiprotic sludge dehydrant
  • Method for preparing amphiprotic sludge dehydrant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the reactor, add 499kg of fresh water, start stirring, and add 1.1kg of nonionic polyacrylamide. After complete dissolution, add 0.1 kg of sodium hydroxide (chemically pure) to adjust the pH of the solution to 11-12. Then add 0.5g of disodium edetate (chemically pure), control the reaction temperature at 30°C, add 1200mL of formaldehyde (chemically pure), 1200mL of dimethylamine (chemically pure), and 0.73kg of sodium bisulfite into the reaction kettle , the reaction time is 4h. Finally, add 1500mL hydrochloric acid (chemically pure) to stop the reaction, and this product can be obtained. Dehydrating agent-1.

Embodiment 2

[0020] In the reactor, add 498kg of fresh water, start stirring, and add 1.35kg of nonionic polyacrylamide. After completely dissolving, add 0.17kg of sodium hydroxide (chemically pure) to adjust the pH value of the solution to 9-10. Then add 0.5g of disodium edetate (chemically pure), control the reaction temperature at 50°C, add 2200mL of formaldehyde (chemically pure), 1800mL of dimethylamine (chemically pure), and 0.41kg of sodium bisulfite into the reaction kettle , the reaction time is 3h. Finally, add 2500mL hydrochloric acid (chemically pure) to stop the reaction, and this product can be obtained. Dehydrating agent-2.

Embodiment 3

[0022] In the reactor, add 987kg of fresh water, start stirring, and add 2.85kg of anionic polyacrylamide. After completely dissolving, add 0.25kg sodium hydroxide (chemically pure) to adjust the pH value of the solution to 11-12. Then add 0.4g of disodium edetate (chemically pure), control the reaction temperature at 45°C, add 2500mL of formaldehyde (chemically pure), 2800mL of dimethylamine (chemically pure), and 1.62kg of sodium bisulfite into the reaction kettle , the reaction time is 3h. Finally, add 4000mL hydrochloric acid (chemically pure) to stop the reaction, and this product can be obtained. Dehydrating agent-3.

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Abstract

The present invention relates to a method for preparing the amphoteric polymer which is used for the sludge dewatering. The polymer is a colloid water solution which takes anion or non-ionic polyacrylamide, formaldehyde, organic amine, sodium bisulfite and fresh water as the raw material and is obtained by the reaction at a certain temperature with a few additive and takes the sulfomethyl polyacrylamide and aminomethyl polyacrylamide as the main component. The invention has the advantages of simple technique and equipment, stable reaction process, easy operation and short necessary time. The experiment of dewatering to the sludge of the petroleum refinery shows that the processing effect of the sludge dewatering agent of the invention is better than the existing agent at the condition of same agent adding amount; the COD of the processed filtered solution is less than 2000mg/L, and the oil content is below 1000mg/L. The method can be applied to the processing of the sewage and sludge in the industries of petroleum, chemical industry and the like.

Description

technical field [0001] The present invention relates to a preparation method of a sludge dewatering agent, in particular to a preparation method of an amphoteric sludge dewatering agent, especially for the amphoteric polymer dehydrating agent and the its preparation method. Background technique [0002] In the process of petroleum processing and wastewater treatment, a large amount of oily sludge is produced, such as API grease trap bottom sludge, dissolved air flotation scum, electric desalination sewage oil, oil tank bottom sludge and residual activated sludge, etc. Due to the different production processes of oily sludge, there is a large difference in oil and water content. Oil is composed of hundreds of different types of organic compounds, most of which are toxic, harmful and difficult to biodegrade. The solid particles in oily sludge are distributed in the sludge as extremely small particles, and the mixture of oil-water-solid is in an emulsified state, which is extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 王有华杨丽
Owner CHINA PETROLEUM & CHEM CORP
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