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Preparation and application of phosphate-free type high temperature inhibitor

A high-temperature corrosion inhibitor and solvent technology, which is applied to the preparation and application of phosphorus-free high-temperature corrosion inhibitors, can solve the problems of poor corrosion inhibition effect of non-phosphorus-based corrosion inhibitors, poisoning of processing catalysts, and restrictions on use, and achieves improved performance. Corrosion inhibition effect, strong oxidation resistance, stable product performance

Inactive Publication Date: 2017-01-18
宿迁明江化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many kinds of high-temperature corrosion inhibitors. Phosphorus-based high-temperature corrosion inhibitors have better corrosion inhibition effects, but they will cause catalyst poisoning in subsequent processing and environmental protection problems. Applied coverage

Method used

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  • Preparation and application of phosphate-free type high temperature inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Add 282g of oleic acid and 40g of xylene into a four-neck flask, heat to 80-100°C, keep stirring and add 230g of cyclohexanediamine dropwise, and the dropwise addition is completed within 2 hours; after the dropwise addition is completed, raise the temperature to Heat to 150-180°C, continue to stir for 3-6 hours, dehydrate until the reaction is complete; finally distill off the solvent in the reaction.

[0022] According to the proportion of fatty acid aminoamide 30%, sulfurized isobutylene (T321) 20%, and heavy aromatic solvent oil 50%, it is formulated to make fatty acid aminoamide high temperature corrosion inhibitor.

Embodiment 2

[0023] Example 2: Add 284g of stearic acid and 30g of toluene into a four-neck flask, heat to 100-120°C, stir continuously and add 345g of cyclohexanediamine dropwise, and the dropwise addition is completed within 3 hours; after the dropwise addition is completed, raise the temperature to To 180~200℃, continue to stir for 3~6 hours, dehydrate until the reaction is complete; finally distill off the solvent in the reaction.

[0024] According to the proportion of fatty acid aminoamide 35%, sulfurized isobutylene (T321) 25%, and heavy aromatic solvent oil 40%, it is formulated to make fatty acid aminoamide high temperature corrosion inhibitor.

Embodiment 3

[0025] Example 3: Add 200g of lauric acid and 40g of xylene into a four-necked flask, heat to 80-100°C, keep stirring and add 230g of methylcyclopentadiamine dropwise, and the dropwise addition is completed within 2 hours; after the dropwise addition is completed, the The temperature rises to 160-180°C, and the stirring is continued for 3-5 h, dehydration until the reaction is complete; finally, the solvent in the reaction is distilled off.

[0026] According to the proportion of fatty acid aminoamide 30%, sulfurized isobutylene (T321) 25%, and heavy aromatic solvent oil 45%, it is formulated to make fatty acid aminoamide high temperature corrosion inhibitor.

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Abstract

The invention relates to preparation and application of a phosphate-free type high temperature inhibitor. The preparation comprises the steps that fatty acid and a solvent with the molar ratio being 1:(2-4) are heated to 80-120 DEG C and are continuously stirred, and diamine is dropwise added with the dropwise-adding time being controlled within 1-3h; after dropwise-adding is completed, the temperature is increased to 150-180 DEG C, stirring is continued for 3-6h, and dehydration is conducted to enable the reaction to be complete; and fatty acid aminoacid amide is synthesized, 30-50% of the fatty acid aminoacid amide, 20-30% of isobutene sulfide (T321) and 30-50% of heavy aromatic solvent oil are blended by mass, and the fatty acid aminoacid amide high temperature inhibitor is prepared through compounding. The phosphate-free type high temperature inhibitor can be used for equipment and pipelines corroded by high temperature in the oil refining process, in the initial stage, the filling quantity is 100-200ppm, and after stabilization, the filling quantity is 10-20ppm; and the phosphate-free type high temperature inhibitor is stable in product performance, and has the advantages of being free of phosphate, environmentally friendly, high in oxidation resistance, suitable for automatic dosing control, convenient to use and the like.

Description

technical field [0001] The invention belongs to the field of chemical application, and in particular relates to the preparation and application of a phosphorus-free high-temperature corrosion inhibitor. Background technique [0002] The corrosion of metal equipment in oil refineries can be divided into low-temperature corrosion and high-temperature corrosion, among which high-temperature corrosion occurs in high-temperature parts above 250°C, mainly chemical corrosion, and the corrosion of oil refinery equipment intensifies as the fluid heats up; in recent years , with the continuous deep mining of oil fields and the import of a large amount of high-acid crude oil, China's crude oil is becoming increasingly heavy and inferior, making its acid value continue to increase, and the corrosion of crude oil processing equipment is also becoming more and more serious. The most prominent problem is caused by Corrosion problems caused by corrosive media of naphthenic acid and sulfide,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14
CPCC23F11/145
Inventor 黎士刚石肖张永张健
Owner 宿迁明江化工股份有限公司
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