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Neutralizing corrosion inhibitor used in petroleum processing and preparation method thereof

A processing and gentle technology, applied in the petroleum industry, processing equipment corrosion/scaling inhibition, hydrocarbon oil treatment, etc., can solve the problems of odor pollution, instability, strong alkalinity and corrosion inhibitors in the operating environment, etc., and achieve improvement Corrosion inhibition effect, corrosion reduction, safe and convenient production and operation

Active Publication Date: 2017-12-01
徐文忠 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used organic amine is ethylenediamine, but ethylenediamine still has a strong ammonia smell, and the operating environment is seriously polluted by odor. Reaction and instability occur during the process, and also affect the on-site use effect

Method used

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  • Neutralizing corrosion inhibitor used in petroleum processing and preparation method thereof

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preparation example Construction

[0035] Such as figure 1 As shown, the present invention provides a method for preparing a neutralizing corrosion inhibitor used in petroleum processing, including: mixing polyethylene polyamine with oxalic acid, and reacting for 1-2 hours at a temperature of 85-95°C After the reflux is condensed, and the pH is controlled to be 6.5-7.5, after the reaction is completed, it is compounded with hexamethylenetetramine, then adjust the freezing point to less than -20℃, and finally adjust the pH value to 11-12 to obtain neutralization and corrosion inhibition Agent.

[0036] The invention synthesizes a polyamine-based corrosion inhibitor by reacting polyethylene polyamine and oxalic acid, and is compounded with hexamethylenetetramine to further improve the corrosion inhibition effect, and then adjust the pH value to improve the product’s resistance to acidic corrosion media Neutralization ability, the neutralization and corrosion inhibition rate of this product in 1% hydrochloric acid so...

Embodiment 1

[0045] A preparation method of a neutralizing corrosion inhibitor used in petroleum processing, including the following steps: Polyethylene polyamine is used as the main raw material, reacted with oxalic acid, and the ratio of polyethylene polyamine and oxalic acid is 2: 1. Under the condition of heating to 85°C, react for 1 hour, condense and reflux, and control the pH to 6.5. After the reaction is completed, add 5% hexamethylenetetramine, cool naturally until the temperature is below 90°C, then add 4% Ethylene glycol and polyethylene polyamine adjust the freezing point to be less than -20°C, and then add 12% of the polyethylene polyamine pH to 11 to obtain the final neutralized corrosion inhibitor product, wherein all percentages are mass percentages.

[0046] The main performance indicators of the neutralizing corrosion inhibitor used in the petroleum processing process provided by the present invention are shown in Table 1:

[0047] project

[0048] (Table I)

Embodiment 2

[0050] A preparation method of a neutralizing corrosion inhibitor used in petroleum processing, including the following steps: Polyethylene polyamine is used as the main raw material, reacted with oxalic acid, and the ratio of polyethylene polyamine and oxalic acid is 2: 1. Under the condition of heating to 90℃, react for 1.5 hours, condense and reflux, and control the pH to 7.0. After the reaction is completed, add 6% of hexamethylenetetramine, and cool naturally until the temperature is below 90℃, then add 5.5% Adjust the freezing point of ethylene glycol and polyvinyl polyamine to be less than -20°C, and then add 13.5% of polyvinyl polyamine to a pH value of 11-12 to obtain the final neutralized corrosion inhibitor product

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Abstract

The invention discloses a preparation method of a neutralizing corrosion inhibitor used in petroleum processing, which comprises the following steps of mixing polyethylene polyamine with oxalic acid and reacting for 1 to 2 hours under the temperature of 85 to 95 DEG C, then performing condensation reflux, controlling the pH to be 6.5 to 7.5, after the completion of the reaction, adding hexamethylenetetramine, cooling to 90 DEG C or below, then adjusting the condensation point to be less than subzero 20 DEG C, and adjusting the pH to be 11 to 12, so as to obtain the neutralizing corrosion inhibitor. The invention also discloses the neutralizing corrosion inhibitor. In the invention, a polyamine-based corrosion inhibitor is synthesized by reacting the polyethylene polyamine with the oxalic acid and is compounded with the hexamethylenetetramine to further improve the corrosion inhibition effect, and then the pH value is adjusted to improve the neutralizing capability of a product to an acid corrosion medium, the neutralization and corrosion inhibition rate of the product in a 1% hydrochloric acid solution can reach not less than 90% on average, and the iron ion concentration is less than 2PPM, fully meeting the technical requirements of a field device; meanwhile, the product no longer has a strong volatile ammonia odor and has no pollution to the operation environment, and the production and operation are more safe and convenient.

Description

Technical field [0001] The invention belongs to the technical field of anti-corrosion during petroleum processing, and relates to a neutralizing corrosion inhibitor used in petroleum processing and a preparation method thereof. The neutralizing corrosion inhibitor is often used in the neutralization and corrosion protection of the equipment in the low-temperature parts of the atmospheric and vacuum distillation, catalytic cracking, ethylene and other devices in the petroleum processing process and the condensation system of the fractionation tower and the stripping tower. Background technique [0002] In the process of petroleum processing, various production devices such as atmospheric and vacuum distillation, distillation, coking, ethylene, etc., will have a stripping process to distill the oil. In the stripping process, various acidic corrosive media will be carried to the top of the tower. Condensation cooling system causes acid corrosion to equipment and pipeline materials. ...

Claims

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Application Information

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IPC IPC(8): C10G75/02
CPCC10G75/02
Inventor 徐文忠
Owner 徐文忠
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