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CN-121991718-A - Sustained-release crude oil iron removing agent and preparation method thereof

CN121991718ACN 121991718 ACN121991718 ACN 121991718ACN-121991718-A

Abstract

The invention discloses a slow-release crude oil iron remover and a preparation method thereof, and relates to the technical field of petrochemical industry, wherein the iron remover is prepared by compounding an acidic biological complexing agent, a slow-release complexing agent, an acidic surfactant and a precipitant according to a specific proportion; the preparation method comprises the steps of respectively preparing and finally compounding the components, rapidly capturing iron ions in crude oil through an acidic biological complexing agent, slowly releasing the complexing agent to realize long-acting deep de-iron, improving dispersibility by an acidic surfactant, and promoting sedimentation of an iron complex by a precipitant to realize synergistic effect of the components. The iron removing agent has high iron removing rate, good slow release effect, qualified stability and low corrosion to equipment, can effectively reduce the iron content of crude oil, is suitable for an industrial electric desalting process, and solves the problems of incomplete iron removing, poor slow release and strong corrosion of the existing iron removing agent.

Inventors

  • LIU ZHE
  • LI FEI

Assignees

  • 信昌科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260402

Claims (9)

  1. 1. The slow release crude oil iron removing agent is characterized by being prepared by compounding (by volume ratio) an acidic biological complexing agent, a slow release complexing agent, an acidic surfactant and a precipitant (20-40), wherein (35-55), (5-15) and (8-12), and the preparation process of the components is as follows: (1) An acidic biological complexing agent is prepared by taking deionized water, citric acid and sodium alginate as basic raw materials, adding 0.5-1.0g/L of ascorbic acid, and simultaneously adding Span-80 and diatomite; (2) The slow-release complexing agent is prepared by taking sodium polyacrylate, tetra sodium ethylenediamine tetraacetate, benzenesulfonic acid, urea, diethyl oxalate, 95% ethanol and ethyl silicate as basic raw materials, adding modified montmorillonite, and simultaneously adding hydroxypropyl methylcellulose and guar gum; (3) The acidic surfactant solution is prepared by taking deionized water, ethanol with the mass percentage concentration of 95%, acetic acid and polyether modified silicone oil as basic raw materials, adding sodium dodecyl benzene sulfonate, and simultaneously adding urotropine; (4) The precipitant is prepared with deionized water and anionic polyacrylamide as basic materials and through adding polyaluminium chloride.
  2. 2. The slow release crude oil deironing agent of claim 1, wherein the diatomaceous earth has an average particle size of from 100 to 300 mesh.
  3. 3. The slow release crude oil deironing agent of claim 1, wherein the sodium polyacrylate is identified by the brand NP-700.
  4. 4. The slow release crude oil deironing agent of claim 1, wherein the modified montmorillonite is Feng Hong DK2 polymer grade organoclay.
  5. 5. The slow release crude oil deironing agent of claim 1, wherein the hydroxypropyl methylcellulose has a number average molecular weight of 90000.
  6. 6. The slow release crude oil deironing agent of claim 1, wherein the polyether modified silicone oil is model DY-ET204.
  7. 7. The slow release crude oil deironing agent of claim 1, wherein the anionic polyacrylamide is identified by the brand name FP3530S.
  8. 8. The slow release crude oil deironing agent of claim 1, wherein the polyaluminum chloride has a product number WH15928.
  9. 9. A method for preparing a slow release crude oil deironing agent according to any one of claims 1 to 8, comprising the steps of: Step S1, preparing an acidic biological complexing agent, namely taking 900-1100mL of deionized water, adding 52-56g of citric acid, stirring and dissolving, keeping the stirring speed at 28-32 r/min, keeping the stirring speed at 10-15min, preparing solution 1, adding 0.5-1.0g of ascorbic acid into the solution 1, stirring until the ascorbic acid is completely dissolved, adding 3-6g of Span-80 and 4-8g of diatomite into the solution, stirring uniformly, keeping the stirring speed at 28-32 r/min, keeping the stirring time at 10-15min, taking 105-109g of sodium alginate, heating the solution 1 containing the ascorbic acid, span-80 and the diatomite to 78-82 ℃, keeping the temperature stable, keeping the stirring speed at 30-40 r/min, slowly pouring the sodium alginate into the solution 1, continuously heating and stirring for 28-32min, standing for 10-15min after stopping heating, filtering by adopting filter paper at medium speed, removing insoluble impurities, preparing the acidic biological complexing agent, and keeping in a sealed manner for standby; Step S2, preparing a slow-release complexing agent solution, namely fully mixing 55.2-58.2g of sodium polyacrylate, 84.2-86.2g of tetra sodium ethylenediamine tetraacetate and 20-20.6g of benzenesulfonic acid, putting the three solid powders into a grinder for grinding, sieving with a 80-120 mesh sieve to obtain mixed powder, adding 5-8g of modified montmorillonite, 14-16g of urea and 19-21mL of diethyl oxalate into the mixed powder, simultaneously adding 3-6g of hydroxypropyl methylcellulose and 1.5-3g of guar gum into the mixed powder, uniformly stirring, putting into a reaction kettle, adding 680-720mL of 95% ethanol and 290-310mL of ethyl silicate into the reaction kettle, sealing the reaction kettle, starting a stirring device, heating to 73-78 ℃ at constant temperature for reacting for 5-7h, naturally cooling to normal temperature after the reaction is finished, and preparing the slow-release complexing agent solution, and sealing and preserving for standby; Step S3, preparing an acidic surfactant solution, namely adding 740-760mL of deionized water, adding 240-260mL of ethanol with the mass percentage concentration of 95%, uniformly mixing, adding 290-310g of acetic acid, stirring for dissolving, wherein the stirring speed is 30-35 r/min, the stirring time is 14-16min, preparing a solution 3, adding 3-5g of sodium dodecyl benzene sulfonate and 1-2g of urotropine into the solution 3, stirring until the solution is completely dissolved, placing the solution 3 containing sodium dodecyl benzene sulfonate and urotropine in a refrigerator at 9-11 ℃, refrigerating for 30-35min, taking out, slowly pouring 148-152g of polyether modified silicone oil, fully stirring for 10-15min, the stirring speed is 50-55 r/min, preparing the acidic surfactant solution, and sealing and preserving for standby; Step S4, preparing a precipitant, namely taking 900-1100mL of deionized water, adding 2.8-3.2g of anionic polyacrylamide, heating to 38-42 ℃, stirring at a speed of 20-25 r/min, continuously stirring for 58-62min until the anionic polyacrylamide is completely dissolved, adding 5-10g of polyaluminium chloride into the solution, continuously stirring for 20-25min, maintaining the stirring speed at 20-25 r/min, naturally cooling to normal temperature, preparing the precipitant, and sealing and preserving for later use; And S5, compounding the iron removing agent, namely respectively weighing an acidic biological complexing agent, a slow-release complexing agent solution, an acidic surfactant solution and a precipitant according to the volume ratio, putting the materials in a stirring kettle, heating the materials in the stirring kettle to 38-42 ℃, regulating the stirring speed to 60-65 r/min, continuously stirring for 14-16min, standing after stirring, naturally cooling to normal temperature to obtain the slow-release crude oil iron removing agent, putting the prepared iron removing agent in a sealed container, and storing in a shade and dry place.

Description

Sustained-release crude oil iron removing agent and preparation method thereof Technical Field The invention relates to the technical field of petrochemical industry, in particular to a slow-release crude oil iron remover and a preparation method thereof. Background Iron ions in crude oil mainly originate from corrosion of equipment, carry-in of formation water and rust of oil pipelines in the exploitation process, and exist in the forms of inorganic salts, organic iron compounds and the like. In the crude oil processing process, iron ions can catalyze sulfide in crude oil to oxidize, so that equipment scaling and corrosion are caused, and meanwhile, the activity and the service life of a catalyst in the subsequent catalytic cracking, hydrofining and other processes are influenced, so that the product quality is reduced. Therefore, the development of efficient crude oil iron remover has important significance for the petroleum refining industry. At present, the main components of the commercial crude oil iron remover are strong acid, complexing agent and precipitant, and the working principle is mainly to remove iron ions by breaking the acid-base balance of crude oil, complexing iron salt by using the complexing agent and combining precipitation and an electric desalting device. However, the iron removing agent has obvious limitations that when the iron content of crude oil is high, the iron removing speed is high and the efficiency is high, but when the iron content of crude oil is lower than 10 mu g/g, the iron removing speed is obviously slowed down, the iron removing efficiency and the iron removing precision are greatly reduced, and the requirement of deep iron removing of crude oil cannot be met. In addition, the existing iron remover has the problems of poor stability and short shelf life, most of the iron remover contains a strong acid component, and can cause serious corrosion to oil refining equipment after long-term use, and meanwhile, the existing iron remover has extremely poor removal effect on oil-soluble iron, especially insoluble iron compounds formed by combining with calcium and magnesium ions under neutral or alkaline conditions. In order to solve the problems, part of the iron remover tries to improve the iron removing effect through the composite complexing agent, but the slow release property of the complexing agent is not considered, so that the complexing capability is intensively released, and continuous iron removing cannot be realized, and part of the iron remover is concentrated on the combination of the solid removing and the iron removing, but the iron removing precision is insufficient, and an effective solution is not provided for the problem of difficult removal of oil-soluble iron, so that the requirement of deep iron removing in industrial production cannot be met. For example, the invention patent document CN107384471B discloses a phosphorus-free crude oil metal removing agent which is a uniform transparent solution with the solid content of 20-40% and is prepared by mixing an organic compound and deionized water at room temperature, wherein the organic compound is prepared by mixing the following components in percentage by mass at room temperature, wherein the chelating agent accounts for 30-50% of the total mass of the organic compound, the organic acid is 5-20%, the carbonate is 3-20%, and the organic amine is 7-27%. The chelating agent is a terpolymer of sodium styrene sulfonate, acrylamide and hydroxypropyl acrylate, and the phosphorus-free crude oil metal remover can be used for removing metals such as nickel, vanadium, iron and the like in petroleum crude oil and wastewater, and has low consumption and high removal efficiency. However, the slow release system is not designed, the complexation capability is intensively released, continuous iron removal cannot be realized when the iron concentration of crude oil fluctuates, the removal effect on oil-soluble iron is limited, meanwhile, the shelf life is shorter due to insufficient stability, and the actual requirement of deep iron removal in industrial production is difficult to adapt. Disclosure of Invention In view of the above, the invention aims to provide a slow-release crude oil iron remover and a preparation method thereof, and the sustained and efficient iron removal during fluctuation of the iron concentration of crude oil is realized by optimizing a formula, so that the iron removal precision is improved, the stability of the iron remover is improved, the shelf life is prolonged, and the equipment corrosion is reduced. The slow-release crude oil iron remover is prepared by compounding (by volume ratio) an acidic biological complexing agent, a slow-release complexing agent, an acidic surfactant and a precipitant (20-40), wherein (35-55), (5-15) and (8-12) in a ratio of (by volume), and the preparation process of each component comprises the following steps: (1) An acidic biological complexing agent is prep