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Synthesis method of long-chain alkyl dihydroxyethyl amine oxide

A technology of long-chain alkyl dihydroxyethylamine and long-chain alkyl dihydroxyethyl, which is applied in the field of synthesis of long-chain alkyl dihydroxyethyl amine oxides, and can solve the problem of corrosion of ordinary carbon steel pipelines and complex synthesis process , high concentration of drag-reducing and energy-saving agents, etc., to achieve the effect of simple and easy raw material utilization and wide applicable temperature range

Inactive Publication Date: 2011-08-17
TIANJIN VOCATIONAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis process of existing long-chain alkyl amine oxide surfactants is relatively complicated, and consumes a large amount of raw material hydrogen peroxide. The research did not consider the problem that the existing drag-reducing and energy-saving agent has a high concentration and is obviously corrosive to ordinary carbon steel pipelines.

Method used

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  • Synthesis method of long-chain alkyl dihydroxyethyl amine oxide
  • Synthesis method of long-chain alkyl dihydroxyethyl amine oxide
  • Synthesis method of long-chain alkyl dihydroxyethyl amine oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In a 500mL four-necked reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a reflux condenser, add 137g (0.5mol) of laurylamine polyoxyethylene (2) ether industrial product and 80mL of deionized water, stir and mix to form Heat the emulsion to 60°C, add 48.9g (0.45mol) of 35% hydrogen peroxide dropwise within 3 hours, control the reaction temperature at 60-80°C, and keep the reaction for 4 hours after the addition. Sampling is carried out regularly, when the conversion of tertiary amine is more than 90%, 1.5 g of sodium hypophosphite is added to decompose excess hydrogen peroxide, and residual hydrogen peroxide is detected with starch / potassium iodide test paper. Cool the solution to room temperature to obtain a colorless and transparent solution with a lauryl dihydroxyethylamine oxide content of about 40%, which is ready for use.

Embodiment 2

[0037] In a 500mL four-necked reaction flask equipped with a mechanical stirrer, a thermometer, a dropping funnel, and a reflux condenser, add 150g (0.5mol) of coconut oil amine polyoxyethylene (2) ether industrial product and 100mL of deionized water, stir and mix Form an emulsion, heat to 60°C, add 48.9g (0.45mol) of 35% hydrogen peroxide dropwise within 3 hours, control the reaction temperature at 60-80°C, and keep the reaction for 4 hours after the addition. Sampling is carried out regularly, when the conversion of tertiary amine is more than 90%, 1.5 g of sodium hypophosphite is added to decompose excess hydrogen peroxide, and residual hydrogen peroxide is detected with starch / potassium iodide test paper. The solution was cooled to room temperature to obtain a colorless and transparent solution with a content of about 40% of cocoyl dihydroxyethylamine oxide, which was set aside.

Embodiment 3

[0039] According to the drag reducer performance loop evaluation method, on the drag reducer performance evaluation device, to tap water at different temperatures, add lauryl dihydroxyethyl amine oxide (CDAO) concentration 1000mg / L prepared in Example 1, at a flow rate of 3m / The drag reduction rate and corrosion inhibition rate were measured under s, and the results are shown in Table 1. The test results show that the lauryl dihydroxyethyl amine oxide surfactant has high drag reduction rate and corrosion inhibition rate.

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Abstract

The invention discloses a method for synthesizing long-chain alkyl dihydroxyethyl amine oxide by oxidizing long-chain alkyl dihydroxyethyl amine with hydrogen peroxide, which is characterized in that the conversion rate of the raw material tertiary amine is controlled at 90-95%, and the unconverted raw material tertiary amine is used as a corrosion inhibitor for enhancing the corrosion inhibition function of the surfactant. The method comprises the following steps: (1) mixing the raw material long-chain dihydroxyethyl amine and deionized water to form an emulsion, and heating to 60-80 DEG C; (2) slowly and dropwisely adding a hydrogen peroxide solution to oxidize the long-chain alkyl dihydroxyethyl amine, and after finishing adding the hydrogen peroxide solution, keeping the temperature to react for 3-4 hours; and (3) when the conversion rate of the raw material tertiary amine reaches 90-95%, adding sodium hypophosphite to decompose residual hydrogen peroxide and regulate the concentration of amine oxide in the solution to 40%. When the long-chain alkyl dihydroxyethyl amine oxide is used as a drag reducer for a circulating water system of 5-60 DEG C, and added into the circulating water system for evaluation in the effective concentration of 0.2-1.0kg / m<3>, the drag reduction rate is up to 50-65%, and the corrosion inhibition efficiency is up to 98-99%. The synthesis method of long-chain alkyl dihydroxyethyl amine oxide has the advantage of high utilization ratio of raw material, and is simple to implement. The product synthesized by the method disclosed by the invention has the characteristic of wide range of applicable temperature and has the function of corrosion inhibition for common metal pipelines when being used as an energy-saving drag reducer for a circulating water system.

Description

technical field [0001] The present invention relates to a synthesis method and application of long-chain alkyl dihydroxyethyl amine oxide, especially a synthesis method of long-chain alkyl dihydroxyethyl amine oxide with corrosion inhibition function and its application as a drag-reducing and energy-saving agent . Background technique [0002] Long-chain alkyl amine oxide is easily soluble in water and polar organic solvents. It is a weak cationic amphoteric surfactant. Its aqueous solution is cationic in acidic conditions and non-ionic in alkaline conditions. It has good Thickening, antistatic, soft, foaming, and decontamination properties; it also has bactericidal, calcium soap dispersing capabilities, and good biodegradability; long-chain alkyl amine oxides are mild in nature and low in irritation, and can effectively reduce detergents. The irritation of anionic surfactant is an environment-friendly daily chemical product; it can also be used as an antistatic agent formu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C291/04B01F17/16B01F17/38C02F5/12C09K23/16C09K23/38
Inventor 李建生孙宝丰何韬冯艳文李霞
Owner TIANJIN VOCATIONAL INST
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