Calix[4]arene derivative, non-phosphorus scale inhibition, dispersion and corrosion inhibition agent, preparation method and application

Abstract

The invention discloses a calix[4]arene derivative shown in a formula I and further discloses a preparation method and application of the calix[4]arene derivative, a non-phosphorus scale inhibition, dispersion and corrosion inhibition agent, and application of the non-phosphorus scale inhibition, dispersion and corrosion inhibition agent as a water treatment agent for circulating cooling water. The non-phosphorus scale inhibition, dispersion and corrosion inhibition agent provided by the invention is especially suitable for circulating cooling water with the calcium hardness and total alkalinity smaller than or equal to 1,600 mg / L, so that the upper limits of the indexes are increased by 500 mg / L, a wider application range is achieved, the concentration multiple of circulating cooling water is increased, and the purposes of water saving and carbon emission reduction are achieved. The non-phosphorus scale inhibition, dispersion and corrosion inhibition agent provided by the invention has favorable scale inhibition and corrosion inhibition effects, can effectively avoid scaling, corrosion and / or the like of a heat exchanger caused by low flow velocity, long retention time of circulating cooling water, temperature rise greater than a design value and the like, is nonnitrogenous and environment-friendly, avoids secondary pollution to water and solves the eutrophication problem of water. The formula I is figured above.

Description

technical field

[0001] The invention relates to the field of water treatment, in particular to a new calix[4]arene derivative, a phosphorus-free scale and disperse corrosion inhibitor containing the same, and their preparation method and application. Background technique

[0002] In the process of industrial production, there are many ways of cooling, but because of the good chemical stability of water, large heat capacity, not easy to decompose, no obvious expansion and compression, at the same time, it has good fluidity, wide range of sources, and low price. Most enterprises choose water as the heat transfer cooling medium to cool finished products, semi-finished products, production equipment, high temperature medium, etc. At present, it is widely used in petroleum refining, chemical industry, coal-to-liquids, coal chemical industry, and iron and steel metallurgy industries. The cooling water volume of these industries accounts for more than 60% of the total industrial wa...

Examples

preparation example Construction

[0047] Preparation of embodiment 1 calix [4] arene derivative

[0048] Step (1): Under nitrogen protection, add 1 g of calix[4]arene, 2 g of 2-chloroacetic acid, 50 mL of DMF, and 2 g of sodium hydroxide into a three-necked flask, and reflux for 24 h under magnetic stirring. Evaporate most of the solvent under reduced pressure, dissolve in ethanol aqueous solution, add dilute hydrochloric acid (5%) to acidify, obtain light yellow precipitate, filter with suction, and recrystallize the filter cake with chloroform-methanol mixed solution to obtain white powder.

[0049] Step (2): Add 1g of white powder and 2mL of concentrated sulfuric acid (70wt%) into a round bottom flask, and react at room temperature for 12 hours under stirring. Add 20mL of diethyl ether, a precipitate is formed, filter with suction, dissolve the filter cake with 20mL of water, and use BaCO 3 Neutralized to neutral; filter, and dry the filtrate to obtain a white solid, dissolve it with a small amount of hot ...

Embodiment 3

[0068] Accurately weigh 0.0050 g of the calix[4]arene derivative obtained in Example 1 (the content in water is 5 mg / L), 0.0022 g of zinc sulfate heptahydrate (the content of zinc ions is 0.5 mg / L), and dissolve them in 1 L of test water In 1, after the dissolution is complete, the corrosion inhibition rate and scale inhibition rate are measured. The measurement results are that the corrosion rate of carbon steel is 0.032mm / a, the corrosion inhibition rate is 96.4%, and the scale inhibition rate of calcium carbonate is 93.1%.

Embodiment 4

[0070] Accurately weigh 0.0050 g of the calix[4]arene derivative obtained in Example 1 (the content in water is 5 mg / L), 0.0022 g of zinc sulfate heptahydrate (the content of zinc ions is 0.5 mg / L), and dissolve them in 1 L of test water In 2, after the dissolution is complete, the corrosion inhibition rate and scale inhibition rate are measured. The measurement results are that the corrosion rate of carbon steel is 0.026mm / a, the corrosion inhibition rate is 96.7%, and the scale inhibition rate of calcium carbonate is 91.3%.

technical field

[0001] The invention relates to the field of water treatment, in particular to a new calix[4]arene derivative, a phosphorus-free scale and disperse corrosion inhibitor containing the same, and their preparation method and application. Background technique

[0002] In the process of industrial production, there are many ways of cooling, but because of the good chemical stability of water, large heat capacity, not easy to decompose, no obvious expansion and compression, at the same time, it has good fluidity, wide range of sources, and low price. Most enterprises choose water as the heat transfer cooling medium to cool finished products, semi-finished products, production equipment, high temperature medium, etc. At present, it is widely used in petroleum refining, chemical industry, coal-to-liquids, coal chemical industry, and iron and steel metallurgy industries. The cooling water volume of these industries accounts for more than 60% of the total industrial wa...

Examples

preparation example Construction

[0047] Preparation of embodiment 1 calix [4] arene derivative

[0048] Step (1): Under nitrogen protection, add 1 g of calix[4]arene, 2 g of 2-chloroacetic acid, 50 mL of DMF, and 2 g of sodium hydroxide into a three-necked flask, and reflux for 24 h under magnetic stirring. Evaporate most of the solvent under reduced pressure, dissolve in ethanol aqueous solution, add dilute hydrochloric acid (5%) to acidify, obtain light yellow precipitate, filter with suction, and recrystallize the filter cake with chloroform-methanol mixed solution to obtain white powder.

[0049] Step (2): Add 1g of white powder and 2mL of concentrated sulfuric acid (70wt%) into a round bottom flask, and react at room temperature for 12 hours under stirring. Add 20mL of diethyl ether, a precipitate is formed, filter with suction, dissolve the filter cake with 20mL of water, and use BaCO 3 Neutralized to neutral; filter, and dry the filtrate to obtain a white solid, dissolve it with a small amount of hot ...

Embodiment 3

[0068] Accurately weigh 0.0050 g of the calix[4]arene derivative obtained in Example 1 (the content in water is 5 mg / L), 0.0022 g of zinc sulfate heptahydrate (the content of zinc ions is 0.5 mg / L), and dissolve them in 1 L of test water In 1, after the dissolution is complete, the corrosion inhibition rate and scale inhibition rate are measured. The measurement results are that the corrosion rate of carbon steel is 0.032mm / a, the corrosion inhibition rate is 96.4%, and the scale inhibition rate of calcium carbonate is 93.1%.

Embodiment 4

[0070] Accurately weigh 0.0050 g of the calix[4]arene derivative obtained in Example 1 (the content in water is 5 mg / L), 0.0022 g of zinc sulfate heptahydrate (the content of zinc ions is 0.5 mg / L), and dissolve them in 1 L of test water In 2, after the dissolution is complete, the corrosion inhibition rate and scale inhibition rate are measured. The measurement results are that the corrosion rate of carbon steel is 0.026mm / a, the corrosion inhibition rate is 96.7%, and the scale inhibition rate of calcium carbonate is 91.3%.

Images