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Environment-friendly crude oil decalcifying agent and preparation method thereof

A crude oil decalcifying agent, an environmentally friendly technology, which is used in the refining of hydrocarbon oil, petroleum industry and other directions, can solve the problems of easily blocking equipment pipelines by sediment, strong corrosion of industrial equipment, low calcium removal rate, etc., and achieves a green preparation process. Environmentally friendly, low production cost, and the effect of improving the decalcification effect

Active Publication Date: 2016-09-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as the chemical chelation method disclosed in Chinese patent documents CN1076473, CN87105863, CN86107286, CN1657594, these methods adopt aminocarboxylic acid, dibasic carboxylic acid, hydroxycarboxylic acid etc. which can generate water-soluble chelates with calcium to carry out decalcification of crude oil, such The shortcoming of method is that used medicament price is more expensive; Chemical acid treatment method, as the disclosed method of Chinese patent literature CN1055552, CN1454967, CN1521239, utilizes organic or inorganic medium strong acid and petroleum acid calcium in crude oil to carry out weak acid replacement medium strong acid hydrogen ion The principle is to reduce calcium petroleum acid to petroleum acid to remove calcium in crude oil. The disadvantage is that the acid used is harmful to the environment and has strong corrosion to industrial equipment. It is necessary to upgrade the existing equipment and select corrosion-resistant materials. Or develop a corresponding high-efficiency corrosion inhibitor, and the acid value of the crude oil has a significant increase after decalcification; the chemical precipitation method disclosed in Chinese patent documents CN1120575, CN1245201, CN1054261, CN1760338, etc., this type of method uses water-soluble sulfate, phosphate and Calcium petroleum in crude oil acts to form slightly soluble or insoluble calcium sulfate and calcium phosphate precipitates, which are deposited in the water phase to achieve the purpose of decalcification. The disadvantage of this type of decalcification method is that the calcium removal rate is not high, and the resulting Sediments are easy to block equipment pipelines, and industrial waste generated at the same time needs to be treated. The presence of nutrient-rich phosphorus will also cause serious environmental pollution
In summary, the existing decalcifiers can not meet the needs of the industry well, so the development of an environmentally friendly and efficient decalcifier will produce huge economic and social and environmental benefits in the oil refining process

Method used

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  • Environment-friendly crude oil decalcifying agent and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: at N 2 Add 80g of allyloxypolyethylene glycol monoether and 20g of cysteine ​​into the reaction kettle and mix them evenly at 25°C, adjust the pH to 3 with 10wt% hydrochloric acid, react with microwave for 0.1h, and the microwave power is 300W. After the microwave reaction, continue the reaction at 90°C for 2 hours, then weigh 30g of allyl urea, 20g of monoethyl maleate, 10g of mercaptoethanol and 300g of distilled water into the reaction kettle and mix them evenly. After cooling down to 85°C, add 50g of 4wt% The sodium persulfate aqueous solution was dropped for 1 hour. After the dropwise addition, the reaction was continued at 85°C for 3 hours. After the temperature was lowered to 25°C, a brown-red transparent environment-friendly crude oil decalcifier was obtained.

[0020] Taking Luning Pipeline Oil as the experimental crude oil, the calcium content is 25.6ppm, and the iron content is 7.3ppm. When the dosage of the obtained environment-friendly crude oil ...

Embodiment 2

[0021] Example 2: at N 2 Add 100g of allyloxypolyethylene glycol monoether and 30g of asparagine into the reaction kettle and mix them evenly at 25°C, adjust the pH to 2.5 with 10wt% hydrochloric acid, react with microwave for 0.3h, and the microwave power is 500W. After the reaction, continue to react at 60°C for 3 hours, then weigh 50g of allyl urea, 30g of monoethyl maleate, 10g of mercaptopropionic acid and 250g of distilled water into the reaction kettle and mix them evenly. After the temperature is raised to 85°C, add 50g of 6wt% Ammonium persulfate aqueous solution, after 2 hours of dripping, continue to react at 85°C for 4h, after dropping to 25°C, a brown-red transparent environment-friendly crude oil decalcifier is obtained.

[0022] Taking Luning Pipeline Oil as the experimental crude oil, its calcium content is 27.7ppm, and its iron content is 6.9ppm. When the dosage of the obtained environment-friendly crude oil decalcifier is 125ppm, the decalcification rate is 9...

Embodiment 3

[0023] Example 3: In N 2 Add 120g of allyloxypolyethylene glycol monoether and 35g of cysteine ​​into the reaction kettle and mix them evenly at 25°C, adjust the pH to 3.5 with 15wt% hydrochloric acid, react with microwave for 0.5h, and the microwave power is 700W. After the microwave reaction, continue to react at 80°C for 5 hours, then weigh 45g of allyl urea, 30g of monomethyl fumarate, 15g of mercaptopropionic acid and 300g of distilled water into the reaction kettle and mix them evenly. After heating up to 85°C, add 50g of 8wt % sodium persulfonate aqueous solution, drop it in 0.5h, and continue to react at 85°C for 6h after the dropwise addition, and after dropping to 25°C, a brown-red transparent environment-friendly crude oil decalcifier is obtained.

[0024] Taking Luning Pipeline Oil as the experimental crude oil, its calcium content is 29.7ppm, and its iron content is 7.7ppm. When the dosage of the obtained environment-friendly crude oil decalcifier is 121ppm, the d...

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Abstract

The invention relates to an environment-friendly polyether multipolymer crude oil decalcifying agent with stable performance, in particular to an environment-friendly crude oil decalcifying agent and a preparation method thereof. The crude oil decalcifying agent has excellent decalcifying performance, and is prepared from polyether amino-acid ester reaction monomers, allyl thiourea and unsaturated double-bond monomers containing vinyl through free radical polymerization. The general structural formula is shown in the description, wherein A is a repetitive structure unit generated after copolymerization of the unsaturated double-bond monomers containing vinyl, R is -CH2-SH or -(CH2)2-CONH2, the polymerization degree x is 2-500, the polymerization degree y is 2-500, the polymerization degree z is 2-500, and the repetitive unit m is 3-100.

Description

technical field [0001] The invention relates to an environment-friendly crude oil decalcifying agent and a preparation method thereof, belonging to the crude oil pretreatment technology in the technical field of oil refining. Background technique [0002] Due to the increasingly scarce oil resources, more and more oil fields adopt water flooding, polymer flooding, CO 2 With the wide application of tertiary oil recovery technologies such as flooding, the properties of crude oil are getting worse and worse, and the proportion of low-quality crude oil with high salt content and high acid content is increasing. Common metals in crude oil include sodium, calcium, magnesium, iron, nickel, vanadium, etc. It is generally believed that in addition to sodium in the form of inorganic salts such as chloride, most metals such as calcium, magnesium, and iron exist in the form of naphthenates and phenates, while nickel and vanadium mostly exist in the form of porphyrin compounds or asphal...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F226/02C08F222/16C10G29/20
CPCC08F283/065C10G29/20C08F226/02C08F222/16
Inventor 周钰明马帅帅黄镜怡蔡志岚梁爽孙伟吴文导
Owner SOUTHEAST UNIV
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