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A corrosion and scale inhibitor based on modified tannic acid and a preparing method thereof

A technology of corrosion and scale inhibitor and tannin acid, which is applied in the field of corrosion and scale inhibitor based on modified tannin and its preparation, can solve the problem of incomplete pharmaceutical information, and achieve good corrosion and scale inhibition effect, Improve the effect of the application

Inactive Publication Date: 2019-04-02
JURONG NINGWU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent Application No. 201410731750.6 "A Preparation Method of Phosphorus-Free Corrosion and Scale Inhibitor", discloses that the main components are sodium polyepoxysuccinate, carbon steel corrosion inhibitor, surfactant, reinforcing agent, etc., but some agents incomplete information

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 15 grams of tannic acid, 25 grams of polyacrylic acid, and 1 gram of p-toluenesulfonic acid into 59 grams of xylene, stir and mix, and control the partial esterification of tannic acid at 130 ° C, and judge the reaction by the amount of water separated end. Then, the solvent in the reaction system is distilled off under reduced pressure to obtain polyacrylate tannin.

[0017] Mix 35 grams of polyacrylic acid tannin, 2 grams of sodium potassium tartrate, 1 gram of sodium citrate, 20 grams of methanol, 42 grams of water, etc., and stir evenly to obtain the target product. The scale inhibition rate of the obtained target product is 96.56%, and the corrosion rate is 0.046mm / a.

Embodiment 2

[0019] Add 25 grams of tannic acid, 25 grams of polyacrylic acid, and 2 grams of p-toluenesulfonic acid into 48 grams of xylene, stir and mix, and control the partial esterification of tannic acid at 140 ° C, and judge the reaction by the amount of water separated end. Then, the solvent in the reaction system is distilled off under reduced pressure to obtain polyacrylate tannin.

[0020] Mix 30 grams of polyacrylic acid tannin, 5 grams of sodium potassium tartrate, 4 grams of sodium citrate, 30 grams of methanol, 31 grams of water, etc., and stir well to obtain the target product. The scale inhibition rate of the obtained target product is 97.86%, and the corrosion rate is 0.040mm / a.

Embodiment 3

[0022] Add 15 grams of tannic acid, 25 grams of polyacrylic acid, and 1 gram of p-toluenesulfonic acid into 59 grams of xylene, stir and mix, and control the partial esterification of tannic acid at 130 ° C, and judge the reaction by the amount of water separated end. Then, the solvent in the reaction system is distilled off under reduced pressure to obtain polyacrylate tannin.

[0023] Mix 60 grams of polyacrylic acid tannin, 1 gram of sodium potassium tartrate, 1 gram of sodium citrate, 15 grams of methanol, 23 grams of water, etc., and stir evenly to obtain the target product. The scale inhibition rate of the obtained target product is 97.42%, and the corrosion rate is 0.048mm / a.

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Abstract

A corrosion and scale inhibitor based on modified tannic acid and a preparing method thereof are disclosed, and belong to the field of corrosion and scale inhibitors. The novel corrosion and scale inhibitor is developed, is phosphorus-free, nitrogen-free and zinc-free, can realize zero-sewage operation, has good corrosion and scale inhibition effects in a circulating cooling water system, and is an environmentally friendly corrosion and scale inhibitor. Tannic acid and polyacrylic acid are adopted as raw materials, the tannic acid is partially esterified at a certain temperature under action of a catalyst, then vacuum distillation is performed to obtain poly(tannin acrylate), and then the poly(tannin acrylate) is mixed with a synergist and a solvent to obtain the phosphorus-free corrosionand scale inhibitor. The prepared corrosion and scale inhibitor includes, by mass, 30-60% of the poly(tannin acrylate), 1-10% of the synergist, and 20-40% of methanol, with the balance being deionizedwater.

Description

technical field [0001] The invention belongs to the field of corrosion and scale inhibitors, in particular to a modified tannin-based corrosion and scale inhibitor and a preparation method thereof. Background technique [0002] Today's industrial water consumption accounts for a large proportion of cooling water, the supply of cooling water has a major impact on the operation of the entire enterprise, and increasing the reuse rate of cooling water as much as possible can save industrial water. However, due to the continuous evaporation of the cooling water, the salts in the water are concentrated, and the contact between the cooling water and the atmosphere increases the content of dissolved oxygen and bacteria, which leads to serious scaling and corrosion problems in the circulating cooling water, which reduces the heat exchange rate and requires frequent maintenance. Threat production proceeds as normal. For this reason, it is necessary to add scale inhibitors and corrosi...

Claims

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Application Information

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IPC IPC(8): C02F5/10
CPCC02F5/10C02F2303/08C02F2303/22
Inventor 应军李怀阁翟洪金倪小明徐东海孙延兰季霞
Owner JURONG NINGWU CHEM
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