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Environment-friendly composite crude oil decalcifying agent

A crude oil decalcifier, an environmentally friendly technology, applied in the treatment of hydrocarbon oil, refined hydrocarbon oil, petroleum industry, etc., can solve the problems of low calcium removal rate, corrosion of industrial equipment, difficult industrialization, etc., and achieve high-efficiency removal effect , The use process is simple, and the effect of improving the chelating ability

Inactive Publication Date: 2016-07-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disclosed crude oil decalcification technology such as CN1112424C, CN1454967A belongs to chemical acid treatment method, and this kind of technology is to utilize organic or inorganic medium strong acid to replace the petroleum acid calcium principle in crude oil to remove the calcium in crude oil, the shortcoming of this kind of method is that adopts industrial The acid environment is not friendly, and it is seriously corrosive to industrial equipment, so it is necessary to use corrosion-resistant equipment; the crude oil decalcification technology disclosed in CN1055552A, CN1054261A, CN1078234C, etc. belongs to the chemical precipitation method. It interacts with petroleum acid in crude oil to generate slightly soluble or insoluble calcium sulfate, calcium phosphate, and calcium bicarbonate, which are deposited in the water phase under the action of a solid wetting agent to achieve the purpose of decalcification. The disadvantage of this decalcification method is The calcium removal rate is not high, and the generated sediment is easy to block the equipment pipeline. At the same time, the industrial waste generated needs to be treated, causing serious environmental pollution.
The disclosed crude oil decalcification techniques such as CN1076473, CN87105863, CN86107286, CN1657594 belong to the chemical chelation method, and these methods adopt aminocarboxylic acid, dibasic carboxylic acid, hydroxycarboxylic acid etc. which can generate water-soluble chelates with calcium to carry out crude oil decalcification, The disadvantage of this type of method is that the medicaments used are expensive and difficult to industrialize.
In summary, the existing decalcifiers can not meet the needs of the industry well, so the development of an efficient and environmentally friendly decalcifier will produce significant economic and social and environmental benefits in the oil refining process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: at N 2 Add 100g of allyloxypolyethylene glycol monoether and 30g of methionine 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 0.1h, and the microwave power is 100W. After the microwave reaction, continue to react at 95°C for 2 hours, then weigh 25g of itaconic acid, 20g of maleic anhydride, 5g of mercaptoacetic acid and 300g of distilled water into the reaction kettle and mix them evenly. After cooling down to 85°C, add 50g of 4wt% ammonium persulfate dropwise Aqueous solution, after 2 hours of dripping, continue to react at 85°C for 3 hours, after dropping to 25°C, a brown-red transparent chelating agent A is obtained.

[0022] The environment-friendly compound crude oil decalcifier is prepared by mixing 35g of the above-mentioned chelating agent A, 20g of acetic acid, 20g of polyacrylic acid, 2g of sodium lauryl sulfate, 1g of urotropine, and 22g of deionized water at a room ...

Embodiment 2

[0023] Example 2: at N 2 Add 120g of allyloxypolyethylene glycol monoether and 30g of methionine into the reaction kettle and mix them evenly at 25°C, adjust the pH to 3.5 with 10wt% hydrochloric acid, react with microwave for 0.3h, and the microwave power is 300W. After the microwave reaction, continue to react at 75°C for 4 hours, then weigh 50g of itaconic acid, 30g of acrylamide, 15g of isopropanol and 350g of distilled water into the reaction kettle and mix them evenly. After heating up to 85°C, add 50g of 6wt% sodium persulfonate dropwise Aqueous solution, after 1 hour of dripping, continue to react at 85°C for 6 hours, after dropping to 25°C, a brown-red transparent chelating agent B is obtained.

[0024] Preparation of environment-friendly composite crude oil decalcifier: remove 40 g of the above-mentioned chelating agent B, 15 g of citric acid, 25 g of hydrolyzed polymaleic anhydride, 1 g of dodecyltrimethylammonium bromide, 2 g of hexamethylenetetramine, and 17 g of ...

Embodiment 3

[0025] Example 3: In N 2 Add 100g of allyloxypolyethylene glycol monoether and 35g of methionine into the reaction kettle and mix them evenly at 25°C, adjust the pH to 4.5 with 15wt% hydrochloric acid, react with microwave for 0.5h, and the microwave power is 500W. After the microwave reaction, continue to react at 80°C for 6 hours, then weigh 45g of itaconic acid, 30g of maleic anhydride, 15g of mercaptoacetic acid and 400g of distilled water into the reaction kettle and mix them evenly. After heating up to 85°C, add 50g of 8wt% persulfonic acid Sodium aqueous solution, after 1.5 hours of dropwise addition, continue to react at 85°C for 6 hours, and after lowering to 25°C, a brownish-red transparent chelating agent C is obtained.

[0026]Preparation of environment-friendly composite crude oil decalcifier: 25g of the above-mentioned chelating agent C, 15g of sulfamic acid, 25g of maleic acid acrylic acid copolymer, 1.5g of ethylene glycol butyl ether, 2.5g of thiourea, and 31g...

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Abstract

The invention relates to an environment-friendly composite crude oil decalcifying agent which is prepared from the following components in percentage by mass: 20-60wt% of a chelating agent, 5-20wt% of an organic acid, 20-40wt% of a dispersant, 0.1-5wt% of a surfactant, 0.5-3wt% of a corrosion inhibitor and 10-40wt% of water. The environment-friendly composite crude oil decalcifying agent does not contain phosphorus; due to introduction of an amino acid structure, the environment-friendly composite crude oil decalcifying agent has relatively good biological degradability and is a novel environment-friendly crude oil decalcifying agent. By the decalcifying agent, over 90% of calcium in crude oil can be eliminated; the decalcifying agent does not contain a eutrophic element phosphorus and is environmentally friendly.

Description

technical field [0001] The invention relates to an environment-friendly compound crude oil decalcifying agent, which belongs to the technical field of crude oil pretreatment in the technical field of oil refining. Background technique [0002] Part of the calcium in crude oil exists in the form of water-soluble salts and slightly soluble salts such as calcium chloride, calcium bicarbonate, calcium sulfate, calcium phosphate, etc., and the other part exists in the form of calcium petroleum acid. In the process of electric desalting in refineries, most of the soluble salts and hydrophilic inorganic calcium salt particles can be generally removed; however, the lipophilic inorganic calcium salt particles and calcium petroleum acid present in the oil phase are almost not removed. As a result, this part of metal calcium has serious harm to the subsequent crude oil processing. Studies have shown that during catalytic cracking, calcium is deposited on the catalyst, which limits the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G29/28C10G29/26C08F283/06C08F222/02C08F222/06C08F220/56
CPCC10G29/28C08F283/065C10G29/26C10G2300/201C08F222/02
Inventor 黄镜怡马帅帅蔡志岚梁爽周钰明孙伟吴文导
Owner SOUTHEAST UNIV
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