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Phosphorus-free precleaning prefilming agent and cleaning process

A chemical and pre-film technology, applied in the field of cleaning and pre-filming process, cleaning and pre-film water treatment chemicals, can solve problems such as excessive effluent, and achieve the effect of economical satisfaction

Inactive Publication Date: 2011-07-20
贾凯华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, phosphorus-containing water treatment chemicals are used in the cleaning and pre-filming of production equipment, heat exchangers, and pipelines in various industries. Potassium pyrophosphate (TKPP) is the main component of pre-cleaning and pre-filming commonly used in water treatment. , but TKPP contains phosphorus, especially in the replacement after cleaning, it will discharge a large amount of polluted water after cleaning with high phosphorus value into the water body, which directly leads to the serious excess of the effluent
Now, the country's discharge standards for sewage are gradually increasing, especially the indicators of eutrophication and heavy metals in water bodies have been raised to quite high standards. 0.5ppm, etc., the current water treatment cleaning and pre-coating agents cannot meet the new discharge standards. Therefore, the application of all phosphorus-free cleaning and pre-filming agents and cleaning processes is of great significance

Method used

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  • Phosphorus-free precleaning prefilming agent and cleaning process
  • Phosphorus-free precleaning prefilming agent and cleaning process
  • Phosphorus-free precleaning prefilming agent and cleaning process

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Effect test

Embodiment 1

[0028] Phosphate-free cleaning and pre-coating agents mainly include two components in independent packaging, in which component A is a phosphorus-free complexing agent, and component B is a phosphorus-free pickling agent. The weight of the two components A:B The serving ratio is 10-30:4-7.

[0029] Among them, the preparation of component A sodium gluconate adopts the heterogeneous catalytic oxidation method: prepare a certain amount of glucose solution and add it to a four-necked flask, weigh an appropriate amount of catalyst and add it to the flask, keep the temperature constant, feed air into the solution, and continuously A certain concentration of NaOH solution is added dropwise to maintain a certain pH value. After the reaction, the solution is cooled and filtered by suction (catalyst recovery), and the filtrate is concentrated and crystallized by distillation under reduced pressure to obtain sodium gluconate crystals after air-drying.

[0030] The preparation of compon...

Embodiment 2

[0077] The cleaning process using the phosphorus-free cleaning agent of the present invention: chemical cleaning mainly uses complexing agents, dispersants, pickling agents and bactericides to remove rust and dirt generated by the system during operation, and provide clean metal surfaces after cleaning , so that the protective film can be quickly established during pre-filming, and no phosphorus discharge can be achieved.

[0078] The main medicines and functions used in cleaning:

[0079] (1) Sodium gluconate: It is mainly a complexing agent, which has a good complexing effect on the rust in the system under certain pH conditions, so as to better remove the rust in the system. At the same time, it has a certain effect of corrosion inhibition and film formation, and has a certain protective effect on the cleaned surface.

[0080] (2) Dispersants: mainly polymer dispersants. It has a good dispersing effect on calcium phosphate, iron oxide, suspended solids, slime, etc.

[00...

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Abstract

The invention belongs to the field of environment production water treatment. A phosphorus-free cleaning prefilming agent mainly comprises two components that are independently packaged, wherein component A is a phosphorus-free complexing agent, the component B is a phosphorus-free pickling agent, and the weight part ratio of the component A to the component B is (10-30):(4-7). The agent mainly comprises sodium gluconate and boric acid, wherein sodium gluconate is classic organic acid and has certain iron ion chelation and corrosion inhibition effects; and the cleaning prefilming agent is phosphorus-free and biodegradable, has excellent corrosion inhibition and scale inhibition effects, and can meet sewage discharge standard. Boric acid is commonly used inorganic acid in industrial and civil applications, and no discharge concentration of boron is found in the current wastewater discharge standard. Boric acid can be used as rust inhibitor, lubricant and thermal oxidization stabilizer and the wastewater discharge standard can also be met. The two components are reasonably compounded and applied to ensure good cleaning and prefilming effect, without generating corrosion.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment, and particularly relates to cleaning and pre-membrane water treatment agents, and the invention also relates to a cleaning and pre-membrane process. Background technique [0002] At present, phosphorus-containing water treatment chemicals are used in the cleaning and pre-filming of production equipment, heat exchangers, and pipelines in various industries. Potassium pyrophosphate (TKPP) is the main component of pre-cleaning and pre-filming commonly used in water treatment. , but TKPP contains phosphorus, especially in the replacement after cleaning, it will discharge a large amount of polluted water after cleaning with high phosphorus value into the water body, which directly leads to the serious exceeding of the effluent. Now, the country's discharge standards for sewage are gradually increasing, especially the indicators of eutrophication and heavy metals in water bodies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/02
Inventor 贾凯华
Owner 贾凯华
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