A special metal corrosion inhibitor for "alkylation device D212 tower" and a preparation method thereof

Abstract

This invention discloses a special metal corrosion inhibitor for the "D212 tower of an alkylation unit," comprising: ammonium bicarbonate, sodium benzoate, sodium nitrite, sodium molybdate, hexamethylenetetramine, ammonia, ethylenediamine, ethanolamine, ethanol, and deionized water. The metal corrosion inhibitor contains 5-31% ammonium bicarbonate, 10-16% sodium benzoate, 0-3% sodium nitrite, 12-15% sodium molybdate, 13% hexamethylenetetramine, 0-22.5% ammonia, and 12.5-22.5% ethylenediamine. A metal corrosion inhibitor specifically for the "D212 tower of an alkylation unit" and its preparation method are described below. The method involves first weighing deionized water and adding it to a clean enamel-lined reactor; then, while stirring, adding ammonium bicarbonate, sodium benzoate, sodium nitrite, sodium molybdate, hexamethylenetetramine, ammonia, ethanolamine, and ethanol in sequence; finally, adding ethylenediamine; stirring for 2 hours after addition, and checking for any insoluble matter; then filtering and packaging. Under the same conditions, compared with similar purchased products, the weight loss of this invention is only one-tenth of that of similar products on the market, demonstrating significant anti-corrosion effect. The price difference is nearly tenfold.

Description

Technical Field

[0001] This invention relates to the field of metal corrosion inhibitors, specifically to a metal corrosion inhibitor for the "D212 tower of alkylation unit" and its preparation method. Background Technology

[0002] Thousands of years ago, humans began using metals. The use of metals greatly propelled social progress and the course of human history. Today, metals are even more inseparable from human life. However, both metals and alloys inevitably face the problem of corrosion. Corrosion is a spontaneous phenomenon that inevitably occurs in the natural environment, and this process is irreversible.

[0003] The corrosion prevention of metals has long been a major concern, and various methods and techniques have been employed. The main methods include sacrificial anodes, altering alloy composition, and using corrosion-resistant metals or alloys. These methods can mitigate corrosion to some extent; however, they all suffer from high costs, difficulty in implementation, and limited applicability.

[0004] Metal corrosion inhibitors are substances used on metal surfaces to provide protection. They are a type of specialized fine chemicals and corrosion protection technology. Adding trace amounts or small quantities of these chemicals can significantly reduce the corrosion rate of metal materials in a medium, even to zero, while maintaining the original physical and mechanical properties of the metal material.

[0005] Compared with other corrosion prevention technologies, adding corrosion inhibitors has several significant advantages, such as requiring no special equipment, simple control, low cost, and easy operation. Considering the excellent corrosion prevention effect and good economic benefits, corrosion inhibitors have been widely used in petroleum extraction and processing, pickling, and industrial circulating water systems.

[0006] After years of development, many types of corrosion inhibitors have been synthesized and utilized. The vast majority of corrosion inhibitors contain heteroatoms, such as N, O, S, P, etc., or contain aromatic rings. These compounds all have lone pairs of electrons, which are easy to interact with metals, thereby forming a protective barrier between the metal and alloy surface and the corrosive medium, achieving the purpose of slowing down metal corrosion.

[0007] Metal corrosion inhibitors have advantages such as wide application, low dosage, low cost, low investment, simple operation, minimal corrosion to the metal substrate, and good protective effect. Therefore, the research and application of corrosion inhibitors has become one of the research hotspots in the field of corrosion prevention at home and abroad.

[0008] Our company's alkylation unit's D212 tower operates on a special medium. The material, after alkali and water washing, runs at high speed, posing a potential risk of acid corrosion and cavitation to metal equipment. To ensure safe production and minimize losses, we have developed a specialized metal corrosion inhibitor. This inhibitor utilizes neutralization and adsorption principles to protect the tower equipment.

[0009] There are similar corrosion inhibitor products on the market, but they are expensive, ineffective, and can contaminate the main product. Summary of the Invention

[0010] The purpose of this invention is to provide a special metal corrosion inhibitor for the "D212 tower of an alkylation unit" and its preparation method, which solves the problem of product contamination. The corrosion inhibitor is highly polar, miscible with water, and does not contaminate hydrocarbon materials; it improves the anti-corrosion effect and reduces production costs. The corrosion inhibitor has the advantages of 5 times the anti-corrosion effect of similar products on the market and a production cost that is one-tenth of the price of similar products on the market. This solves the problem that while similar corrosion inhibitors exist on the market, they are expensive, ineffective, and contaminate the main product.

[0011] To achieve the above objectives, the present invention provides the following technical solution:

[0012] A special metal corrosion inhibitor for "alkylation unit D212 tower" comprises: ammonium bicarbonate, sodium benzoate, sodium nitrite, sodium molybdate, hexamethylenetetramine, ammonia, ethylenediamine, ethanolamine, ethanol, and deionized water. The metal corrosion inhibitor contains 5-31% ammonium bicarbonate, 10-16% sodium benzoate, 0-3% sodium nitrite, 12-15% sodium molybdate, 13% hexamethylenetetramine, 0-22.5% ammonia, 12.5-22.5% ethylenediamine, 1.6% ethanolamine, 7.8-14.3% ethanol, and 6.6-10.1% deionized water.

[0013] Preferably, the ethanol purity is 95%.

[0014] Preferably, the ammonium bicarbonate is 21%, sodium benzoate is 16%, sodium nitrite is 3.0%, sodium molybdate is 12%, hexamethylenetetramine is 13%, ammonia is 6.5%, ethylenediamine is 12.5%, ethanolamine is 1.6%, ethanol is 7.8%, and deionized water is 6.6%.

[0015] A special metal corrosion inhibitor for "alkylation unit D212 tower" and its preparation method, comprising the following steps:

[0016] S1. First, weigh the deionized water and add it to a clean enamel kettle;

[0017] S2. Add ammonium carbonate, sodium benzoate, sodium nitrite, sodium molybdate, hexamethylenetetramine, ammonia, ethanolamine, and ethanol in sequence while stirring.

[0018] S3. Finally, add ethylenediamine;

[0019] S4. Stir for 2 hours after adding the ingredients, and check for any insoluble matter.

[0020] S5, Filter Packaging.

[0021] Preferably, the pH of the solution in S4 is 10.

[0022] Compared with the prior art, the beneficial effects of the present invention are: good water solubility, it can be miscible with water in any proportion, and it does not cause any pollution to the product; the production cost is low, which is one-tenth of that of similar products purchased from outside; the effect is good, and the anti-corrosion effect is 5 times that of similar products purchased from outside; the application range is wide, as it can prevent both acid corrosion and cavitation. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The unit for each ingredient is g.

[0027] Table 1. Composition of the special metal corrosion inhibitor for the "alkylation unit D212 tower" in Examples 1-8.

[0028]

[0029] The verification method for each corrosion inhibitor described in Examples 1-8 above is as follows:

[0030] Mix the corrosion inhibitor of this invention with water at a mass ratio of 1:500. Take 30 ml of this solution and add it to 1000 ml of 1% hydrochloric acid solution, stirring until homogeneous. After treating the substrate as required, weigh it and place it in the solution, maintaining it at 80°C for 4 hours. After completion, clean the substrate and weigh it. Calculate the weight loss value: weight loss value / original weight of substrate * 100% = weight loss rate. Inspect the surface of the substrate for corrosion under a 1000x microscope to check for pitting corrosion.

[0031] Examples 1-8: Corrosion prevention effect of the special metal corrosion inhibitor for "alkylation unit D212 tower":

[0032] Formula #1 has the best anti-corrosion effect, and its cost is not much different from other formulas.

[0033]

[0034] Raw data from the test of the 1# formulation and the purchased sample:

[0035]

[0036]

[0037] The corrosion inhibitor formulation of this invention (Formula 1#) under the same conditions, compared with similar purchased products, exhibits a weight loss of only one-tenth that of similar products on the market, demonstrating a significant anti-corrosion effect. Meanwhile, the price difference is nearly tenfold.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A special metal corrosion inhibitor for "alkylation unit D212 tower", comprising: The mixture comprises ammonium bicarbonate, sodium benzoate, sodium nitrite, sodium molybdate, hexamethylenetetramine, ammonia, ethylenediamine, ethanolamine, ethanol, and deionized water, characterized in that: The ethanol purity is 95%; The metal corrosion inhibitor contains 21% ammonium carbonate, 16% sodium benzoate, 3.0% sodium nitrite, 12% sodium molybdate, 13% hexamethylenetetramine, 6.5% ammonia, 12.5% ​​ethylenediamine, 1.6% ethanolamine, 7.8% ethanol, and 6.6% deionized water. The unit for each ingredient value is g.

2. A method for preparing a special metal corrosion inhibitor for "alkylation unit D212 tower", characterized in that, Includes the following steps: S1. First, weigh the deionized water and add it to a clean enamel kettle; S2. Add ammonium carbonate, sodium benzoate, sodium nitrite, sodium molybdate, hexamethylenetetramine, ammonia, ethanolamine, and ethanol in sequence while stirring. S3. Finally, add ethylenediamine; S4. Stir for 2 hours after adding the ingredients, and check for any insoluble matter. S5, Filter Packaging; The solution pH in S4 is 10.

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