A corrosion and scale inhibitor for circulating cooling water

A technology of corrosion and scale inhibitor, circulating cooling water, applied in descaling and water softening, complex/solubilizer treatment, water/sludge/sewage treatment, etc. , high price and other problems, to achieve high hydrolytic stability and thermal stability, reduce initial corrosion phenomenon, good inhibition effect

Active Publication Date: 2016-08-24
SICHUAN YANGSEN PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual use of this patent, there are still the following defects: 1. Although the molybdate used as a corrosion inhibitor in the composite corrosion and scale inhibitor has the characteristics of low toxicity, harmlessness and good stability, the current application shows that : The corrosion inhibition effect of molybdate is poor, and the amount used alone is relatively large, and the price is expensive, resulting in high cost of water treatment
2. The phosphorus content in composite corrosion and scale inhibitors is still high, which not only easily pollutes the environment, but also greatly restricts the use of this type of corrosion and scale inhibitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A corrosion and scale inhibitor for circulating cooling water, comprising the following components by mass percentage: organophosphorus (2-hydroxyphosphonoacetic acid) 4%, dispersant (2-phosphonobutane-1 , 2,4-tricarboxylic acid) 2%, copolymer (acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-phosphinic acid telomer) 30%, zinc salt (zinc chloride) 10%, Deionized water 54%.

[0024] experimental method:

[0025] Corrosion inhibition performance was measured with reference to "GB / T 18175-2000 Determination of Corrosion Inhibition Performance of Water Treatment Agents by Rotating Coupon Method". The materials for the coupons used in the experiment were Q235 carbon steel and 316L stainless steel. Hang three pieces of each material, and the results are averaged.

[0026] Refer to "GB / T 16632-2008 Calcium Carbonate Deposition Method for Determination of Scale Inhibition Performance of Water Treatment Agents" to measure the scale inhibition performance.

[0027] The r...

Embodiment 2

[0031] A corrosion and scale inhibitor for circulating cooling water, comprising the following components by mass percentage: organophosphorus (2-hydroxyphosphonoacetic acid) 9%, dispersant (2-phosphonobutane-1 , 2,4-tricarboxylic acid) 8%, copolymer (acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-phosphinic acid telomer) 15%, zinc salt (zinc chloride) 3%, Deionized water 65%.

[0032] experimental method:

[0033] Corrosion inhibition performance was measured with reference to "GB / T 18175-2000 Determination of Corrosion Inhibition Performance of Water Treatment Agents by Rotating Coupon Method". The materials for the coupons used in the experiment were Q235 carbon steel and 316L stainless steel. Hang three pieces of each material, and the results are averaged.

[0034] Refer to "GB / T 16632-2008 Calcium Carbonate Deposition Method for Determination of Scale Inhibition Performance of Water Treatment Agents" to measure the scale inhibition performance.

[0035] The re...

Embodiment 3

[0039] A corrosion and scale inhibitor for circulating cooling water, comprising the following components by mass percentage: organophosphorus (3-hydroxy-3-phosphonobutyric acid) 5%, dispersant (2-phosphonic acid group Butane-1,2,4-tricarboxylic acid) 7%, copolymer (acrylic acid-2-acrylamide-2-methylpropanesulfonic acid-phosphinic acid telomer) 20%, zinc salt (zinc sulfate) 8%, deionized water 60%.

[0040] experimental method:

[0041] Corrosion inhibition performance was measured with reference to "GB / T 18175-2000 Determination of Corrosion Inhibition Performance of Water Treatment Agents by Rotating Coupon Method". The materials for the coupons used in the experiment were Q235 carbon steel and 316L stainless steel. Hang three pieces of each material, and the results are averaged.

[0042]Refer to "GB / T 16632-2008 Calcium Carbonate Deposition Method for Determination of Scale Inhibition Performance of Water Treatment Agents" to measure the scale inhibition performance.

...

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Abstract

The invention discloses a corrosion and scale inhibitor for recirculated cooling water. The corrosion and scale inhibitor comprises the following components in percentage by weight: 4 to 9% of organic phosphorus, 2 to 8% of dispersing agent, 15 to 30% of copolymer, 3 to 10% of zinc salt and the balance of deionized water. By virtue of the corrosion and scale inhibitor, regenerated water can be effectively prevented from being subjected to scale formation during a circulating cooling process, and the speed of corroding a circulatory cooling system by the regenerated water can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a corrosion and scale inhibitor for circulating cooling water, mainly a low-phosphorus and high-efficiency composite corrosion and scale inhibitor for recycled water in petrochemical circulating cooling water systems. Background technique [0002] In the petrochemical industry, circulating cooling water accompanies the whole process of production, accounting for 70% to 80% of the total water consumption. Due to the continuous evaporation and concentration of the circulating cooling water, the scaling and corrosion of the circulating cooling water are relatively serious, and it is easy to breed bacteria and algae, which will affect the heat transfer effect of the equipment and reduce the service life of the equipment. Therefore, in order to improve the reuse rate of industrial water, it is necessary to carry out water quality treatment on the circulating cooling water to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F5/14C02F5/10C02F5/08
CPCC23F11/08C23F14/02
Inventor 祁向清曹超付菊园
Owner SICHUAN YANGSEN PETROLEUM TECH CO LTD
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