Oil-inhibiting salt-making scale inhibitor and its application in raw brine pipeline transportation system

Abstract

The present application relates to a kind of oil-inhibiting salt-making scale inhibitor and its application in raw brine pipeline transportation system, oil-inhibiting salt-making scale inhibitor includes the component and the weight percentage of solid content as follows: 10%-30% of starch industry wastewater, 10%-30% of block polyether, 40-80% of the weight ratio of one or two of polyepoxysuccinic acid sodium or polyaspartic acid, above-mentioned component is dissolved in deionized water and is compounded to prepare oil-inhibiting salt-making scale inhibitor.The present application can enhance the dispersibility of dirt, effectively inhibit the adhesion and deposition of oil on the pipe wall, make the oil sludge composite deposit soft and easy to clean, and have a certain cleaning effect on the composite oil sludge produced by the interaction of oil, slime and inorganic salt scale in brine, improve the scale inhibition application effect, effectively prolong the cleaning cycle of brine pipeline and equipment.

Description

Technical Field

[0001] This invention relates to the field of scale inhibitors for salt production, and in particular to an oil-inhibiting scale inhibitor for salt production and its application in raw brine pipeline transportation systems. Background Technology

[0002] In the salt-making process, brine extracted from underground is collected and transported to the salt plant. Simultaneously, wastewater and salt mud generated by the salt plant are used for brine extraction through well injection to fully utilize wastewater and waste residue. Because the raw brine has a high salt content and contains a certain amount of impurities such as slime, and is subject to high temperature and pressure, during transportation, as the temperature and pressure decrease, scale and deposits such as calcium and magnesium ions (carbonates and sulfates) and slime easily form in the brine transport pipelines. This causes a series of problems, including decreased brine flow rate, increased brine pressure, and increased brine pump current, seriously affecting the pipeline's transport capacity and service life.

[0003] To address the scaling problem unique to the salt production process, the raw brine pipeline transportation system widely employs chemical treatment methods involving the addition of salt production scale inhibitors. Currently used salt production scale inhibitors are generally compound products composed of components such as polycarboxylic acid, hydrolyzed polymaleic anhydride, sodium polyepoxysuccinate, polyaspartic acid, sulfonate copolymers, sodium gluconate, organophosphonic acid, or organophosphonates.

[0004] Patent document CN114291908A discloses a salt-making scale inhibitor, comprising 40% terpolymer, 10%-20% sodium polyepoxysuccinate, 15-25% polyaspartic acid, and 20%-40% water. The terpolymer is copolymerized from maleic anhydride, allyl ether, and a hydroxyl compound using an aqueous solution free radical polymerization method, and the relative molecular weight of the terpolymer is 3000-4000.

[0005] Patent CN109231509A discloses a salt-making scale inhibitor, which comprises an organophosphonic acid or organophosphate, a terpolymer, a phosphonoacylcarboxylic acid copolymer, a monopolymer, and deionized water. The terpolymer is a carboxylate-sulfonate-nonionic copolymer.

[0006] Analysis shows that the drawback of the existing technology is that, since brine in brine wells often contains oily impurities, during the transportation process, these oily substances interact with sludge, inorganic salt scale, etc., to form dense oily sludge deposits, which aggravates the scaling of brine pipelines and seriously affects the normal operation of the brine transportation system. The application effect of traditional salt production scale inhibitors is not ideal. Summary of the Invention

[0007] The first objective of this invention is to address the problem described in the background art that, due to the presence of oily impurities in brine wells, these oily substances interact with slime, inorganic salt scale, etc., during transportation to form dense oily sludge deposits, which exacerbate the structural problems of brine transportation pipelines. The invention also addresses the unsatisfactory application effect of existing salt-making scale inhibitors, and provides an oil-suppressing salt-making scale inhibitor that can solve these problems.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solution: an oil-suppressing salt-making scale inhibitor, comprising the following components and weight percentages based on solid content: 10%-30% starch industrial wastewater, 10%-30% block polyether, and 40-80% by weight of one or two of sodium polyepoxysuccinate or polyaspartic acid, wherein the above components are dissolved in deionized water to prepare the oil-suppressing salt-making scale inhibitor.

[0009] In the above scheme, the block polyether is a hydrophilic substance with an HLB value greater than 10.

[0010] In the above scheme, the block polyether is one or more of block polyether L35, block polyether L45, block polyether L64, block polyether F38 or block polyether F68.

[0011] The second objective of this invention is to provide an application of an oil-inhibiting scale inhibitor for brine production, specifically an oil-inhibiting scale inhibitor for use in a raw brine pipeline transportation system.

[0012] The present invention has positive effects: 1) The starch industrial wastewater in the oil-suppressing salt scale inhibitor of the present invention is a high-concentration organic by-product produced by starch processing or deep processing of agricultural products rich in starch such as corn, potatoes, wheat, and rice. Its main components are water-soluble sugars, such as starch, cellulose, proteins, organic acids, etc., which are non-toxic and have strong biodegradability. The sugars in starch industrial wastewater are polyhydroxy natural polymers, and the water-soluble protein polypeptides they contain contain active groups such as carboxyl and amino groups. Because these byproducts possess both hydrophilic and hydrophobic groups, they exhibit excellent surface activity. This invention utilizes these byproducts, along with sodium polyepoxysuccinate and polyaspartic acid, to form complexes and chelates with metal scale-forming ions (calcium and magnesium ions), effectively inhibiting the growth of scale crystals and solubilizing the scale ions. Simultaneously, the hydrophilic functional groups and long polymer chains in the starch industrial wastewater can interact through hydrogen bonding, electro-attraction, and other adsorption and bridging processes to form a relatively stable affinity on the surface of oil sludge composite sediment particles, enhancing fouling dispersibility. 2) The block polyether in this invention is typically composed of polyoxyethylene (… Composed of ethylene oxide (EO) and polyoxypropylene (PPO), this invention is a random copolymer of EO and PO, exhibiting biodegradability. Due to its excellent surface activity, it is widely used in cleaning, emulsification, wetting, penetration, solubilization, lubrication, and antistatic applications. This invention utilizes the surface activity of block polyethers to penetrate the inner surface of oil sludge composite deposit particles, significantly reducing the surface tension of oils and forming a synergistic effect of solubilization, dispersion, and scale inhibition. This effectively inhibits the adhesion and deposition of oils on pipe walls, making the oil sludge composite deposit soft and easy to clean. It also has a certain removal effect on composite sludge generated by the interaction of oil, slime, and inorganic salt scale in brine, thereby improving the scale inhibition effect and effectively extending the cleaning cycle of brine pipelines and equipment. 3) The formulation of this invention is a non-toxic design, effectively reducing environmental pollution and fully meeting green and ecological protection requirements, without affecting downstream processes and products. Simultaneously, it can effectively and comprehensively utilize the water-soluble sugars, proteins, and other resources abundant in starch industrial wastewater. Detailed Implementation

[0013] The technical solution of the present invention will be clearly and completely described below through embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Example 1

[0015] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 10% starch industrial wastewater, 10% block polyether, and 80% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0016] Example 2

[0017] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 10% starch industrial wastewater, 10% block polyether, and 80% sodium polyepoxysuccinate. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0018] Example 3

[0019] An oil-suppressing salt-making scale inhibitor comprises the following components and their weight percentages based on solid content: 20% starch industrial wastewater, 10% block polyether, and 70% sodium polyepoxysuccinate. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing salt-making scale inhibitor.

[0020] Example 4

[0021] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 20% starch industrial wastewater, 10% block polyether, and 70% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0022] Example 5

[0023] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 10% starch industrial wastewater, 20% block polyether, and 70% sodium polyepoxysuccinate. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0024] Example 6

[0025] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 10% starch industrial wastewater, 20% block polyether, and 70% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0026] Example 7

[0027] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 20% starch industrial wastewater, 10% block polyether, 35% sodium polyepoxysuccinate, and 35% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0028] Example 8

[0029] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 10% starch industrial wastewater, 20% block polyether, 35% sodium polyepoxysuccinate, and 35% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0030] Example 9

[0031] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 10% starch industrial wastewater, 10% block polyether, 40% sodium polyepoxysuccinate, and 40% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0032] Example 10

[0033] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 15% starch industrial wastewater, 15% block polyether, 35% sodium polyepoxysuccinate, and 35% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0034] Example 11

[0035] An oil-suppressing scale inhibitor for salt production comprises the following components and their weight percentages based on solid content: 30% starch industrial wastewater, 30% block polyether, 20% sodium polyepoxysuccinate, and 20% polyaspartic acid. The above components are dissolved in deionized water and compounded to obtain the oil-suppressing scale inhibitor for salt production.

[0036] Comparative Example

[0037] Using a salt-making scale inhibitor from the prior art as a comparative example 1, its components include: organophosphonic acid or organophosphate, terpolymer, phosphonocarboxylic acid copolymer, monopolymer and deionized water.

[0038] Using a salt-making scale inhibitor from the prior art as a comparative example 2, its components include: terpolymer, sodium polyepoxysuccinate, polyaspartic acid and deionized water.

[0039] The scale inhibition performance of the oil-suppressing scale inhibitors of Examples 1-11 of the present invention and the scale inhibitors of Control Examples 1 and 2 was tested. The test method was as follows: a certain concentration of the scale inhibitors of Control Examples 1-2 and Examples 1-11 were added to a high-pressure reactor containing an oily brine sample. The temperature was raised to 300°C and 6.0 MPa, and held for 12 hours. After cooling to room temperature, the brine sample was analyzed to observe the scale condition and the scale inhibition rate was calculated. The calculation method was as follows:

[0040] Scale inhibition rate % = (Total hardness after test with reagent added - Total hardness after test with blank solution without reagent) / (Total hardness before test with blank solution without reagent - Total hardness after test with blank solution without reagent); The test results are shown in the table below.

[0041]

[0042] The above test results show that after treatment with the oil-suppressing scale inhibitor of the present invention, the scale in the brine sample is loose and fluid, proving that the scale inhibition effect of the oil-suppressing scale inhibitor of the present invention is obvious. Compared with the scale inhibitors of Comparative Examples 1 and 2, the scale inhibition rate of the oil-suppressing scale inhibitor of the present invention is significantly improved, and the scale inhibition rate can be increased from about 85% in the prior art to more than 95%.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil-suppressing salt-manufacturing scale inhibitor, characterized by comprising: The components and the weight percentage at solid content include: starch industrial wastewater 10%-30%, block polyether 10%-30%, one or both of polyepoxysuccinic acid sodium or polyaspartic acid with a weight ratio of 40-80%, and the above components are dissolved in deionized water to prepare an oil-inhibiting type salt-making scale inhibitor.

2. The oil repelling salt scale inhibitor of claim 1, wherein: The block polyether is a hydrophilic substance with an HLB value greater than 10.

3. The oil repelling salt scale inhibitor of claim 1, wherein: The block polyether is one or more of block polyether L35, block polyether L45, block polyether L64, block polyether F38 or block polyether F68.

4. The use of an oil-repellent salt-making scale inhibitor according to any one of claims 1 to 3, characterized in that: The oil-inhibiting type salt-making scale inhibitor is used in a raw brine pipeline transportation system.

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