CN110760858A - Schiff base waste cooking oil derivative corrosion inhibitor and preparation method and application thereof - Google Patents
Schiff base waste cooking oil derivative corrosion inhibitor and preparation method and application thereof Download PDFInfo
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- CN110760858A CN110760858A CN201910980771.4A CN201910980771A CN110760858A CN 110760858 A CN110760858 A CN 110760858A CN 201910980771 A CN201910980771 A CN 201910980771A CN 110760858 A CN110760858 A CN 110760858A
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- cooking oil
- corrosion inhibitor
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/068—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors compounds containing a C=C bond
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Abstract
The invention discloses a Schiff base waste cooking oil derivative corrosion inhibitor and a preparation method and application thereof. The invention has the beneficial effects that the obtained corrosion inhibitor has good corrosion inhibition effect, and when the concentration of the corrosion inhibitor is 100mg/L, the corrosion inhibition rate of the corrosion inhibitor on carbon steel in 1mol/L hydrochloric acid solution reaches more than 99%.
Description
The technical field is as follows:
the invention belongs to the field of industrial pickling processes, and particularly relates to a Schiff base waste cooking oil derivative corrosion inhibitor, and a preparation method and application thereof.
Background art:
the carbon steel material is widely applied to various fields of modern industry, in particular to the fields of petrochemical industry and oceans. Carbon steel materials are extremely easy to corrode by factors such as acid and chloride ions, and huge economic loss is brought to national economy. It is estimated that each Chinese bears approximately 1555 dollars of corrosion cost each year, with a total amount of over 2.1 trillion dollar, i.e., the total national corrosion cost is about 3.34% of the GDP in the year. The corrosion inhibitor is added into the corrosion medium, which is an economic and practical corrosion protection means with convenient operation.
The process of removing scale and rust from the surface of steel using an acid solution is known as pickling. Is a method for cleaning metal surfaces. The acid for pickling is sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, chromic acid, hydrofluoric acid, mixed acid, or the like. The article is generally immersed in an aqueous solution of sulfuric acid or the like to remove a thin film of oxide or the like on the metal surface. Acid cleaning is also a pretreatment or intermediate treatment of electroplating, enameling, rolling and other processes. Corrosion inhibitors are often added in the pickling process industrially.
The organic corrosion inhibitor structure usually contains heteroatoms or pi bonds, and the heteroatoms such as N, O, S in the structure contain lone pair electrons which can be coordinated with metal and adsorbed on the surface of the metal to play a role in corrosion prevention; the pi bond in the structure shows good corrosion inhibition performance due to the interaction between the orbit and the metal. The Schiff base corrosion inhibitor is an important organic corrosion inhibitor, and the structure of the Schiff base corrosion inhibitor contains-C-N-double bond, benzene ring and a plurality of hetero atoms, wherein the hetero atoms include pi bond, N, O, S and the like, so that the Schiff base corrosion inhibitor is easy to adsorb metal and shows excellent corrosion inhibition behavior. In addition, the Schiff base corrosion inhibitor has the characteristics of high efficiency, greenness and environmental protection, and meets the requirement of building an environment-friendly society.
The waste cooking oil is commonly called as illegal cooking oil, and a large amount of waste cooking oil pollutes the environment and also harms human health. The invention introduces Schiff base into waste cooking oil, takes the waste cooking oil and 3, 4-diaminotoluene as raw materials, and takes anhydrous aluminum chloride as a catalyst to prepare the Schiff base waste cooking oil derivative corrosion inhibitor, and the invention has positive significance for developing a new Schiff base corrosion inhibitor.
The invention content is as follows:
the invention aims to improve the comprehensive utilization degree of the waste cooking oil, develop the preparation of the Schiff base corrosion inhibitor of the waste cooking oil derivative, and be applied to solving the corrosion of industrial pickling solution on carbon steel products.
The preparation method of the Schiff base waste cooking oil derivative corrosion inhibitor is characterized by comprising the following steps of:
(1) firstly, filtering waste cooking oil, adding 5-10% of activated clay into the waste oil, uniformly stirring, decoloring the waste oil, centrifuging, and taking upper-layer oil;
(2) weighing the waste cooking oil pretreated in the step (1) and 3, 4-diaminotoluene according to a molar ratio of 1:3.4, putting the weighed waste cooking oil and 3, 4-diaminotoluene into a 100mL round-bottom flask, respectively adding 20mL of N-methylpyrrolidone and 5 mass percent of anhydrous aluminum chloride into the round-bottom flask, putting the round-bottom flask into a magnetic stirring oil bath, connecting a spherical condenser tube, introducing nitrogen for protection, reacting at 150 ℃ for 3 hours, heating to 200 ℃, and stopping the reaction after reacting for 12 hours to obtain a mauve solution;
(3) and (3) carrying out reduced pressure distillation on the purple red solution obtained in the step (2) to remove the solvent, water and glycerol, and finally obtaining the viscous Schiff base waste cooking oil derivative corrosion inhibitor.
Compared with the prior corrosion inhibitor preparation method, the invention has the following characteristics:
the preparation method comprises the steps of carrying out acylation reaction on the waste cooking oil and 3, 4-diaminotoluene at a certain temperature by taking N-methyl pyrrolidone as a solvent, and continuously heating to dehydrate and cyclize the synthesized amide intermediate product to generate the Schiff base waste cooking oil derivative corrosion inhibitor. The synthesis route of the Schiff base waste cooking oil derivative corrosion inhibitor is as follows.
The preparation method of the Schiff base waste cooking oil derivative corrosion inhibitor provided by the invention is simple and feasible, and is environment-friendly.
The great amount of waste cooking oil not only pollutes the environment, but also has influence on the health of human body. The corrosion phenomenon is a common phenomenon in industrial and agricultural production and daily life, and the corrosion brings great loss to national economy. With the increasing importance of environmental protection in all countries in the world, the construction of an environment-friendly society has important significance. The Schiff base waste cooking oil derivative corrosion inhibitor prepared by using waste cooking oil as a raw material not only improves the comprehensive utilization degree of the waste cooking oil, but also solves the corrosion problem.
Drawings
FIG. 1 is a flow chart of the present invention.
The specific implementation mode is as follows:
the present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example (b):
(1) firstly, filtering waste cooking oil, adding 5-10% of activated clay into the waste oil, uniformly stirring, decoloring the waste oil, centrifuging, and taking upper-layer oil;
(2) weighing the waste cooking oil pretreated in the step (1) and 3, 4-diaminotoluene according to a molar ratio of 1:3.4, putting the weighed waste cooking oil and 3, 4-diaminotoluene into a 100mL round-bottom flask, respectively adding 20mL of N-methylpyrrolidone and 5 mass percent of anhydrous aluminum chloride into the round-bottom flask, putting the round-bottom flask into a magnetic stirring oil bath, connecting a spherical condenser tube, introducing nitrogen for protection, reacting at 150 ℃ for 3 hours, heating to 200 ℃, and stopping the reaction after reacting for 12 hours to obtain a mauve solution;
(3) and (3) carrying out reduced pressure distillation on the purple red solution obtained in the step (2) to remove the solvent, water and glycerol, and finally obtaining the viscous Schiff base waste cooking oil derivative corrosion inhibitor.
Corrosion inhibition performance testing experiment:
(1) pretreatment of carbon steel
Polishing the carbon steel sheet by using sand paper until the surface is smooth, washing the carbon steel sheet by using distilled water, placing the carbon steel sheet into absolute ethyl alcohol for ultrasonic oscillation dehydration, degreasing the carbon steel sheet by using acetone, drying the carbon steel sheet by using cold air, and placing the carbon steel sheet into an oven for drying for later use.
(2) Preparation of acid etching solution
Accurately weighing 0.02g of each group of corrosion inhibitor samples, dissolving the samples in 10mL of n-propanol solvent, and then respectively adding 2.5mL of solution into 47.5mL of 1mol/L hydrochloric acid solution to prepare 100mg/L acid corrosion solution of the corrosion inhibitor. 2.5mL of n-propanol without the corrosion inhibitor is added into 47.5mL of hydrochloric acid solution with the concentration of 1mol/L to prepare a blank acid etching solution.
(3) Corrosion inhibition performance measurement experiment
Sequentially numbering and weighing the pretreated carbon steel sheet, recording the mass of the carbon steel sheet before corrosion as W0, then respectively soaking the carbon steel sheet in a prepared acid corrosion solution for 12h under the condition of 50 ℃ water bath, taking out the soaked carbon steel sheet, washing with distilled water, dehydrating in ethanol, degreasing in acetone, putting into a drying oven for drying, weighing, recording the mass of the corroded carbon steel sheet as W1, average weight loss delta W (g), corrosion rate (A) and corrosion inhibition rate (η) of a corrosion inhibitorW%) was calculated as follows:
ΔW＝W0-W1(1)
in the formula: s is the total soaking area (cm2) of the carbon steel sample, and t is the soaking time (h); a. the0 corrAnd AcorrIs the corrosion rate (g cm) of carbon steel in hydrochloric acid solution without corrosion inhibitor and with corrosion inhibitor-2·h-1)。
According to the method, the corrosion inhibition performance is measured for three times in parallel, and the corrosion inhibition rate is 97%.
Claims (3)
1. The Schiff base waste cooking oil derivative corrosion inhibitor is characterized in that N-methyl pyrrolidone is used as a solvent, fatty acid triglyceride in waste cooking oil and 3, 4-diaminotoluene are subjected to acylation reaction at a certain temperature, and the temperature is continuously increased to dehydrate and cyclize a synthesized amide intermediate product to obtain the Schiff base waste cooking oil derivative corrosion inhibitor.
2. A method for preparing the schiff base waste cooking oil derivative corrosion inhibitor as defined in claim 1, comprising the following steps:
(1) firstly, filtering waste cooking oil, adding 5-10% of activated clay into the waste oil, uniformly stirring, decoloring the waste oil, centrifuging, and taking upper-layer oil;
(2) weighing the waste cooking oil pretreated in the step (1) and 3, 4-diaminotoluene according to a molar ratio of 1:3.4, putting the weighed waste cooking oil and 3, 4-diaminotoluene into a 100mL round-bottom flask, respectively adding 20mL of N-methylpyrrolidone and 5 mass percent of anhydrous aluminum chloride into the round-bottom flask, putting the round-bottom flask into a magnetic stirring oil bath, connecting a spherical condenser tube, introducing nitrogen for protection, reacting at 150 ℃ for 3 hours, heating to 200 ℃, and stopping the reaction after reacting for 12 hours to obtain a mauve solution;
(3) and (3) carrying out reduced pressure distillation on the purple red solution obtained in the step (2) to remove the solvent, water and glycerol, and finally obtaining the viscous Schiff base waste cooking oil derivative corrosion inhibitor.
3. Use of the schiff base used cooking oil derivative corrosion inhibitor according to claim 1, wherein the schiff base used cooking oil derivative corrosion inhibitor is used for corrosion of carbon steel in industrial acid washing liquid.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11866664B2 (en) | 2021-06-10 | 2024-01-09 | Saudi Arabian Oil Company | Green corrosion inhibitor from waste vegetable oil for oil and gas applications |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101723901A (en) * | 2008-10-14 | 2010-06-09 | 上海医药工业研究院 | Method for preparing 2-propylbenzimidazole |
| CN105088252A (en) * | 2015-08-19 | 2015-11-25 | 广东工业大学 | Benzimidazoline corrosion inhibitor prepared from refined swill-cooked dirty oil |
| US20170057929A1 (en) * | 2015-08-25 | 2017-03-02 | Janssen Pharmaceutica Nv | Benzimidazole derivatives useful as cb-1 inverse agonists |
-
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- 2019-10-15 CN CN201910980771.4A patent/CN110760858A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101723901A (en) * | 2008-10-14 | 2010-06-09 | 上海医药工业研究院 | Method for preparing 2-propylbenzimidazole |
| CN105088252A (en) * | 2015-08-19 | 2015-11-25 | 广东工业大学 | Benzimidazoline corrosion inhibitor prepared from refined swill-cooked dirty oil |
| US20170057929A1 (en) * | 2015-08-25 | 2017-03-02 | Janssen Pharmaceutica Nv | Benzimidazole derivatives useful as cb-1 inverse agonists |
Non-Patent Citations (1)
| Title |
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| 黄科程: "以地沟油为原料制备混合脂肪基苯并咪唑啉及其缓蚀性能的研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11866664B2 (en) | 2021-06-10 | 2024-01-09 | Saudi Arabian Oil Company | Green corrosion inhibitor from waste vegetable oil for oil and gas applications |
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