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Method for preparing multifunctional deemulsifying agent of crude oil and products thereof

A crude oil demulsifier and multi-functional technology, which is applied in the fields of hydrocarbon oil dehydration/demulsification, petroleum industry, etc., can solve the problem that the decalcifier has no demulsification function and cannot effectively remove alkaline earth metals, etc., and achieves efficient demulsification and dehydration. performance, good compatibility, strong surface activity

Inactive Publication Date: 2005-03-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using crude oil demulsifier alone cannot effectively remove alkaline earth metals in crude oil; and decalcifier itself has no demulsification function

Method used

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  • Method for preparing multifunctional deemulsifying agent of crude oil and products thereof
  • Method for preparing multifunctional deemulsifying agent of crude oil and products thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Propylene oxide (PO), ethylene oxide (EO) block copolyether

[0017] In a 500ml autoclave equipped with an electric stirrer, add 23.0g of diethylenetriamine and 80ml of mixed xylene, and add 0.2g of potassium hydroxide as a catalyst. Under the condition of heating and stirring, 70.0g of PO and 15.0g of EO are successively introduced, and the reaction temperature The range is 120-140°C, and the reaction pressure is 0.45MPa. After the absorption is complete, the xylene is distilled off under reduced pressure to obtain the desired polyether.

[0018] 2. Synthesis of betaine-type crude oil demulsifier

[0019] In a 500ml three-necked flask with stirring, thermometer, and condenser, add 54.0g of polyether 1 and 220ml of 95% ethanol, carefully add 36.0g of α-haloacetic acid in three batches, reflux for 3 hours after the addition, and remove the white solid in the solution by hot filtration , and then evaporate the ethanol in the filtrate to obtain the product which is the...

Embodiment 2

[0022] The block copolyether was prepared by the method of Example 1. In an autoclave equipped with an electric stirrer, 23.0 g of triethylenetetramine and 80 ml of mixed xylene were added, and 0.2 g of sodium hydroxide was added as a catalyst. Under the condition of heating and stirring, 70.0gPO and 15.0gEO are sequentially introduced, the reaction temperature range is 90-120°C, and the reaction pressure is 0.45MPa. After the absorption is complete, the xylene is evaporated under reduced pressure to obtain the desired polyether.

[0023] In a three-neck flask equipped with stirring, a thermometer, and a condenser, add 54.0 g of the polyether of Example 1 and 200 ml of 95% ethanol, heat to 50° C., and slowly add 49.0 g of α-chloropropionic acid dropwise. After the dropwise addition, the reactant was refluxed for about 2.5 hours to complete the reaction. Remove the white solid by filtration, remove the solvent under reduced pressure and cool the unreacted matter to room tempera...

Embodiment 3

[0028] In a 500ml autoclave equipped with an electric stirrer, add 23.0g of ethylenediamine and 80ml of mixed xylene, and add 0.2g of potassium hydroxide as a catalyst. Under the condition of heating and stirring, 70.0g of PO and 15.0g of EO are successively introduced. The reaction temperature range 130-150°C, the reaction pressure is 0.15MPa, after the absorption is complete, distill the xylene under reduced pressure to obtain the desired polyether.

[0029] In a 500ml three-necked flask with stirring, thermometer, and condenser, add 54.0g of polyether and 220ml of 95% ethanol, carefully add 36.0g of α-halogenated succinic acid in three batches, reflux for 3 hours after the addition, and remove the white color in the solution by hot filtration. solid, and then distill off the ethanol in the filtrate to obtain the finished product. The demulsifier of the invention has good demulsification and demetallization effects, and the demulsifier dosage is 100ppm, which is more economi...

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Abstract

This invention provides a method for preparing crude oil demulsification agent for crude oil pretreatment in refinery plant. Said multi-functional demulsification agent has betaine structure, being of amphoteric-ion surfactant. Organic amine is used as initiator, and epoxy propane and epoxy ethane are polymerized to produce polyether, then reacting with alpha-halogenated carboxylic acid to produce said betaine structure product. This produced has advantages of: excellent emulsification ability and dewater ability, on the molecule there are quaternary amido and carboxy group, so having excellent wetting function, and having good complexation stability to alkaline earth metals in crude-oil, being of calcium-disperser, and having excellent function for removing magnesium and iron.

Description

technical field [0001] The invention relates to a method for preparing a multifunctional crude oil demulsifier used for pretreatment of crude oil in an oil refinery and a product thereof. Background technique [0002] Crude oil electric desalting is an important pretreatment method for crude oil processing in refineries, which has an important impact on the entire process of crude oil processing and product performance. In recent years, with the situation of crude oil becoming heavier and the development of advanced crude oil processing technology, especially the increase of catalytic cracking and hydrocracking of heavy oil, the electric desalination of crude oil has changed from a single anti-corrosion measure in the past to preventing catalyst poisoning and reducing device fouling. It is an important pretreatment process to reduce the ash in residual oil and petroleum coke, which puts forward higher requirements for the electric desalination technology. Most of these meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G33/00
Inventor 杜建卫刘键
Owner PETROCHINA CO LTD
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