Environment-friendly corrosion inhibitor 5-isothiourca succinic acid adonitol ester for deionized water and preparation method thereof

A technology of pentapentyl succinate and isothiourea, applied in chemical instruments and methods, natural water treatment, non-polluted water treatment, etc., to achieve the effect of protecting the environment, low price, and reducing the risk of eutrophication

Active Publication Date: 2017-01-04
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to achieve the purpose of environmental protection and high efficiency, the present invention grafts isothioureido groups in the molecule of pentapentylpentyl pentasuccinate, and the obtained pentapentyl pentaisothioureido succinate can reach Good corrosion inhibition effect, this phosphorus-free environment-friendly corrosion inhibitor has not been reported yet

Method used

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  • Environment-friendly corrosion inhibitor 5-isothiourca succinic acid adonitol ester for deionized water and preparation method thereof
  • Environment-friendly corrosion inhibitor 5-isothiourca succinic acid adonitol ester for deionized water and preparation method thereof
  • Environment-friendly corrosion inhibitor 5-isothiourca succinic acid adonitol ester for deionized water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: Preparation of pentapentyl pentaisothioureido succinate

[0028] Add 90.00 g of glacial acetic acid into a four-necked round-bottomed flask with stirring, reflux condenser and thermometer, then add 15.22 g (0.1 mol) of xylitol, and stir to dissolve. Then add 51.00 g (0.52 mol) of maleic anhydride, stir to dissolve, then raise the temperature to 85°C, and react for 4 h under nitrogen protection and stirring. Cool down to 20°C, add 39.50 g (0.52 mol) of thiourea, and react for 24 h at 30°C under nitrogen protection. Filtrate and dry under vacuum at 95°C to obtain 95.68 g of white powdery product, which is pentylpentyl pentaisothioureidosuccinate, with a yield of 93.62%. Gained pentaisothioureidosuccinate pentapentyl pentaisothioureido succinate nuclear magnetic resonance 13 CNMR (D 2 O) Spectrum: 34.611, 36.781, 38.126, 60.2.13, 69.152, 71.368, 155.716, 175.499, 178.901 ppm.

Embodiment 2

[0029] Embodiment 2 performance test experiment

[0030] This example is to evaluate the corrosion inhibition performance of the pentaisothioureidosuccinate pentapentyl pentaisothioureidosuccinate prepared in the above-mentioned Example 1 and the commercially available corrosion inhibitors in Comparative Examples 1-4. The experimental water was deionized water prepared by reverse osmosis, with a pH of 5.8 and a conductivity of 1.2 μs / cm.

[0031] The evaluation method of the corrosion inhibition test is carried out in accordance with the "National Standard of the People's Republic of China GB / T18175-2000, Determination of Corrosion Inhibition Performance of Water Treatment Agents - Rotary Coupon Method". The experimental instrument is the RCC-II rotary coupon corrosion tester, the experimental conditions: temperature 45°C, rotating speed 75r / min, no pre-coated coupons, time 72 hours. Carbon steel test piece: 20 # Carbon steel, 50mm×25mm×2mm. At the same time, do a blank exp...

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Abstract

The invention relates to environment-friendly corrosion inhibitor 5-isothiourca succinic acid adonitol ester for deionized water and a preparation method thereof. The corrosion inhibitor is 5-isothiourca succinic acid adonitol ester, and a chemical formula thereof is C5H7[OCOCH2CH(COOH)SC(NH)NH2]5. The 5-isothiourca succinic acid adonitol ester has the advantages of being biodegradable, non-toxic, low in cost and good in treatment effect, and is suitable for corrosion inhibition treatment of a deionized water system.

Description

technical field [0001] The invention belongs to the technical field of industrial water treatment, and in particular relates to an environment-friendly corrosion inhibitor pentaisothioureidosuccinate pentapentyl pentaisothioureido succinate and a preparation method thereof. Background technique [0002] With the increasing shortage of water resources, in order to save water, the concentration ratio of the circulating cooling system, which accounts for 70-80% of the total industrial water consumption, is constantly increasing. With the increase of the concentration ratio, the fouling problem becomes more and more serious, and at the same time, problems such as bacterial growth and under-scaling corrosion become more prominent. Therefore, using deionized water as supplementary water for the circulating cooling water system is one of the important measures to save circulating cooling water in recent years. In addition, in some industries, due to the special cooling device or t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12C02F103/02
CPCC02F5/12C02F2103/023C02F2303/08
Inventor 张冰如李风亭孙志豪张晓晶
Owner TONGJI UNIV
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