Preparation method and application of environment-friendly silicate scale pipeline cleaning treatment agent

Abstract

The invention relates to a preparation method and application of an environment-friendly silicate scale pipeline cleaning treatment agent, and discloses preparation and application of a silicate scale cleaning treatment agent which is used in a water treatment process and is formed in oil-water wells, strata, ground gathering and transportation treatment pipelines and various devices in petroleum and petrochemical industries in the fields of industrial water treatment and petrochemical engineering. The cleaning treatment agent comprises the following components: edible radishes, pectinase, methanol, an acid-base regulator, a penetrating agent, a dispersing agent and water. The scale remover disclosed by the invention is nearly neutral and can be used for rapidly dissolving silicate scale; the biodegradability is realized, and the environmental pollution is extremely low; the treatment cost of a post-treatment agent can be effectively reduced. Edible radishes are adopted as raw materials, and the green and environment-friendly pipeline cleaning treatment agent capable of rapidly dissolving silicate scales is prepared. The scale inhibitor is applied to multiple fields of industrial and civil water treatment, petroleum and petrochemical engineering, mechano-electronics and the like, and insoluble silicate scales in pipelines and equipment can be rapidly dissolved.

Description

Technical Field

[0001] The present invention relates to the fields of industrial water treatment, petrochemical industry, etc., especially to the technical field of cleaning treatment of insoluble inorganic salt scales formed in various industrial equipment involved in surface industrial water treatment pipelines, oil gathering and transportation pipelines, and chemical production processes. In particular, it relates to a preparation method and application of an environmentally friendly pipeline cleaning treatment agent for silicate scales. Background Art

[0002] Currently, in common industrial water treatment and the petrochemical industry, since the water quality often contains SiO2 that is insoluble in water, when the internal temperature, pressure, water quality, and on-site operating conditions of the gathering and transportation pipelines change, the solubility of SiO2 often decreases greatly, resulting in slow precipitation on the inner wall of the pipeline and finally forming hard and insoluble solid silicate scales. With the passage of time, these formed inorganic scales are likely to cause blockages inside equipment such as the inner wall of the pipeline, heat exchangers, evaporators, separators, and coils, affecting normal production operations and guarantees. Seriously, it can cause the ground pipelines and various industrial equipment to stop operating, resulting in serious economic losses.

[0003] Inorganic silicate scales generally can be dissolved in strong acids and strong bases. However, during industrial production and operation, strong acids such as hydrochloric acid will cause serious corrosion to ground pipelines, various equipment, and tools. Especially, once the pipelines in the marine environment are corroded, it will cause the in-service time of the pipelines to be greatly shortened prematurely, seriously affecting the development effect. Strong bases such as sodium hydroxide will form alkali corrosion and also cause damage to the pipe wall. At the same time, due to the further strengthening of environmental protection requirements at home and abroad, it is necessary to develop a pipeline cleaning treatment agent that is green, environmentally friendly, low-corrosive, and highly efficient in dissolving silicate scales.

[0004] The present invention has prepared an environmentally friendly pipeline cleaning treatment agent for silicate scales by using environmentally friendly raw materials. Summary of the Invention

[0005] The purpose of the present invention is to provide an environmentally friendly pipeline cleaning agent for silicate scales, thereby solving the foregoing problems existing in the prior art.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present invention is as follows:

[0007] An environmentally friendly pipeline cleaning treatment agent for silicate scales, wherein the cleaning treatment agent is composed of raw materials in the following weight ratio:

[0008] Edible radish 10 - 40 parts,

[0009] Pectinase 0.01 - 0.25 parts,

[0010] Methanol 1 - 10 parts,

[0011] Acid-base regulator 1 - 3 parts

[0012] Penetrant: 0.01 - 0.5 parts

[0013] Dispersant: 0.01 - 0.5 parts

[0014] Deionized water: 40 - 88 parts

[0015] The pH value of the pipeline cleaning treatment agent is in the range of 7 - 9.

[0016] The acid - base regulator includes: strong and weak inorganic acids, strong and weak organic acids, weak acid - weak bases, etc., such as HCl, NaOH, NH4Cl, Na2CO3, NaHCO3, etc.

[0017] The penetrant includes anionic surfactants, non - ionic surfactants and amphoteric surfactants, and combinations thereof such as anionic - non - ionic compounded surfactants. The anionic penetrant selects sodium dodecylbenzenesulfonate (LAS), and the non - ionic penetrant selects fatty alcohol polyoxyethylene ether (AEO), which are prepared in a mass ratio of 1:1.

[0018] The dispersant selects sodium alkyl sulfosuccinate.

[0019] The preparation method of the environmentally friendly silicate scale pipeline cleaning treatment agent includes the following steps:

[0020] 1) Sort and crush the edible radish. After the crushing rate reaches more than 95%, add it to the reaction kettle; conduct hot impregnation at 80°C for 8 h, and then cool to 35°C and continuously stir for more than 4 h;

[0021] 2) Add pectinase and yeast to the reaction kettle, conduct normal - temperature impregnation and continuously stir for 24 h, and obtain the edible radish extract solution after filtering the skin residues;

[0022] 3) Add water, methanol, and acid - base regulator to the reaction kettle, and control the pH value of the system between 7 - 9;

[0023] 4) Slowly add a certain proportion of penetrant and dispersant to the reaction kettle and continuously stir evenly;

[0024] 5) Let it stand, filter to remove impurities, and obtain the silicate scale pipeline cleaning treatment agent of the present invention.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) It can dissolve the silicate scale formed in the pipeline under neutral or weakly alkaline conditions;

[0027] 2) The formed product can be biodegradable and has little environmental pollution;

[0028] 3) Fast dissolution rate, shortening construction time and saving costs;

[0029] 4) Simple and convenient on-site construction.

[0030] The present invention uses edible radish as the main raw material to prepare an environmentally friendly pipeline cleaning and treatment agent that can efficiently dissolve silicate scale. The present invention is applied to multiple fields such as industrial water treatment, petroleum and petrochemical, mechanical and electronics, etc., and can effectively dissolve the insoluble silicate scale formed in the ground pipelines. Brief Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the preparation process of the environmentally friendly silicate scale pipeline cleaning and treatment agent of the present invention;

[0032] Figure 2 It is the cleaning rate of the silicate scale by the silicate scale pipeline cleaning and treatment agent of the present invention under different times and different temperatures;

[0033] Figure 3 It is the corrosion evaluation of the silicate scale cleaning and treatment agent of the present invention at different temperatures and different materials. Detailed Embodiments

[0034] The present invention discloses a preparation method and application of a pipeline cleaning and treatment agent for insoluble silicate scale formed inside ground pipelines and various facilities and equipment in fields such as industrial water treatment, petrochemical industry, and mechanical and chemical industry.

[0035] The composition of the environmentally friendly silicate scale pipeline cleaning and treatment agent of the present invention: edible radish, pectinase, methanol, acid-base regulator, penetrant, dispersant, and deionized water.

[0036] The environmentally friendly silicate scale pipeline cleaning and treatment agent of the present invention is composed of the following raw materials in parts by weight:

[0037] 10 - 40 parts of edible radish,

[0038] 0.01 - 0.25 parts of pectinase,

[0039] 1 - 10 parts of methanol,

[0040] 1 - 3 parts of acid-base regulator

[0041] 0.01 - 0.5 parts of penetrant

[0042] 0.01 - 0.5 parts of dispersant

[0043] 40 - 88 parts of deionized water,

[0044] The pH value of the pipeline cleaning and treatment agent is in the range of 7 - 9.

[0045] The key technology of the environment-friendly silicate scale pipeline cleaning and treatment agent of the present invention lies in:

[0046] (1) Edible radish is selected as the main component of the scale remover to dissolve silicate scale within the neutral range;

[0047] (2) Substances such as polyols, aldehydes, phenols, and esters produced after fermentation and extraction form soluble metal ligands with metal ions such as Ca 2+ ,

[0048] Mg 2+ Al 3+ Fe 3+ in the silicate scale, improving the solubility of the scale sample;

[0049] (3) The acid-base regulator can adjust the acid-base range of the cleaning agent and reduce the corrosion of the metal surface;

[0050] (4) The penetrant can penetrate into the internal pores of the insoluble solid to accelerate the cleaning efficiency of the cleaning agent;

[0051] (5) The dispersant prevents the dissolved particles from colliding with each other and reforming into precipitation, promoting the stability of the system.

[0052] The remarkable effects of the present invention are as follows:

[0053] 1. It has the cleaning effect of efficiently dissolving insoluble silicate scale;

[0054] 2. It has a neutral characteristic and can effectively prevent the cleaning agent from corroding the metal surface;

[0055] 3. The on-site construction is simple and convenient.

[0056] The following details the specific formula and preparation process of the present invention:

[0057] The environment-friendly silicate scale pipeline cleaning and treatment agent of the present invention is composed of the following raw materials in parts by weight:

[0058] 10 - 40 parts of edible radish,

[0059] 0.01 - 0.25 parts of pectinase,

[0060] 1 - 10 parts of methanol,

[0061] 1 - 3 parts of acid-base regulator

[0062] 0.01 - 0.5 parts of penetrant

[0063] 0.01 - 0.5 parts of dispersant

[0064] 40 - 88 parts of deionized water,

[0065] The pH value of the pipeline cleaning treatment agent is in the range of 7-9.

[0066] The specific composition of the penetrant is as follows:

[0067] 1. Anionic surfactant: sodium dodecylbenzenesulfonate;

[0068] 2. Non-ionic surfactant: fatty alcohol polyoxyethylene ether;

[0069] They are prepared according to the mass ratio of 1:1.

[0070] Among them, alkyl sulfosuccinate has good defoaming performance; sodium dodecylbenzenesulfonate (LAS) can solubilize Ca 2+ , Mg 2+ , Al 3+ , Fe 3+ and other high-valent metal cations; fatty alcohol polyoxyethylene ether (AEO) can change the wettability of the surface of silicate scale. The two work together to achieve a synergistic effect in terms of penetration, decontamination, solubilization, etc.

[0071] The penetrant selected is alkyl sulfosuccinate, which has low toxicity and biodegradability, and is safe and environmentally friendly.

[0072] Among them, the processed liquid of edible radish after impregnation, fermentation and purification is used as the main component of the cleaning agent. The polyols, aldehydes, phenols, esters and other substances produced form soluble metal ligands with the Ca 2+ , Mg 2+ , Al 3+ , Fe 3+ and other metal ions, which can effectively dissolve the silicate scale formed inside the pipeline. The acid-base regulator can adjust the acid-base range of the cleaning agent and reduce the corrosion of the metal surface. The penetrant can penetrate into the internal pores of the insoluble solid, accelerating the cleaning efficiency of the cleaning agent. The penetrant can accelerate the speed of the cleaning agent entering the internal pores of the insoluble solid scale and accelerate the ion exchange speed in the solution, effectively improving the scale dissolution efficiency.

[0073] The preparation process of the present invention:

[0074] 1) Sort and crush the edible radish, add it to the reaction kettle after the crushing rate reaches more than 95%; carry out thermal impregnation at 80°C for 8 h, and continuously stir for more than 4 h after cooling to 35°C;

[0075] 2) Add pectinase and yeast to the reaction kettle, impregnate at room temperature and continuously stir for 24 h, and filter the skin residue to obtain the edible radish extract solution;

[0076] 3) Add water, methanol and acid-base regulator to the reaction kettle, and control the pH value of the system between 7-9;

[0077] 4) Slowly add penetrants and dispersants in a certain proportion to the reactor and continuously stir evenly;

[0078] 5) Let it stand, filter to remove impurities, and obtain the pipeline cleaning and treatment agent for silicate scale of the present invention.

[0079] Cleaning mechanism of the pipeline cleaning and treatment agent for silicate scale of the present invention:

[0080] This method uses the impregnation method to treat edible radishes, and through enzymatic reactions and temperature control measures, various chemical substances such as aldehydes, ketones, acids, and esters are formed, which can form chelates with high-valent metal ions such as Ca 2+ 、Mg 2+ 、Al 3+ 、Fe 3+ under appropriate pH conditions.

[0081] These various chemical substances formed can undergo coordination. The specific mechanisms include:

[0082] 1) Carboxyl groups adsorb calcium ions through electrostatic interaction to promote their hydrolysis;

[0083] 2) Hydroxyl groups dissolve calcium ions by forming five-coordinate and six-coordinate complexes with calcium ions;

[0084] 3) Ester groups form carboxyl and hydroxyl groups through hydrolysis, which crosslink with high-valent metal ions together to increase the solubility of the product.

[0085] The added penetrants and dispersants improve the performance and efficiency of the pipeline cleaning and treatment agent by changing the wettability of the solid-liquid surface. Compared with traditional acidic or alkaline pipeline cleaning and treatment agents for silicate scale, this preparation method is simple to operate and is easy to be industrially produced on a large scale.

[0086] Performance evaluation of the environment-friendly pipeline cleaning and treatment agent for silicate scale

[0087] The performance evaluation of the pipeline cleaning and treatment agent for silicate scale of the present invention includes cleaning efficiency and corrosion evaluation.

[0088] 1. Cleaning efficiency evaluation

[0089] Weigh 2.0 g of silicate scale sample, put the sample into 100.0 g of the pipeline cleaning agent of the present invention (preparation method: mix 50.0 g of the cleaning agent mother liquor with 50.0 g of tap water), then put it into an oven at different temperatures. After 8 h and 12 h, filter, and weigh the remaining scale sample as m0. Then the calculation method of the cleaning rate of the silicate scale by the cleaning agent under static conditions is as follows:

[0090] R=(2 - m0) / 2×100%

[0091] Among them, R - cleaning rate of silicate scale, %;

[0092] The weight of the remaining scale sample after m0 - 8h, 12h, and 24h, g.

[0093] The cleaning rate results of the silicate scale pipeline cleaning and treatment agent of the present invention on silicate scale under different temperature and time conditions are shown in the appendix Figure 2 . From the appendix Figure 2 It can be seen that by comparing the cleaning rates of the silicate scale pipeline cleaning agent of the present invention on the silicate scale inside the pipeline under different temperatures and different time conditions, as the temperature increases and the time prolongs, the cleaning rate of the cleaning agent of the present invention on the silicate scale increases, and the cleaning rates at 25°C and 50°C reach 83% and 96.5% respectively.

[0094] 2. Corrosion evaluation of different materials

[0095] Mix 5g of the cleaning agent mother liquor with 95g of tap water to prepare a 5% silicate scale pipeline cleaning agent solution. Select metal coupons made of the common pipe materials 316SS and N80 and place them in the above - prepared solution. Seal and place them in an oven. The experimental temperatures are 25°C and 50°C (representing the fluid temperatures inside common pipelines and various equipment, etc.). Let it stand for 7 days. The corrosion performance evaluation results are shown in the appendix Figure 3 .

[0096] From the appendix Figure 3 It can be seen that for different metal materials (316SS and N80), as the temperature increases, the corrosion rates increase from 0.023mm / a and 0.035 / a to 0.031mm / a and 0.046mm / a respectively. The corrosion rates increase slightly and are significantly lower than the requirement that the corrosion rate of ground sewage treatment should not exceed 0.076mm / a.

[0097] Specific on - site examples of the environmentally friendly silicate scale pipeline cleaning and treatment agent

[0098] When the silicate scale pipeline cleaning and treatment agent of the present invention is actually applied in the fields of industrial water treatment, petroleum and petrochemical, etc., static soaking process, dynamic circulation process, and online co - injection process can be adopted. The specific process to be used is determined according to the actual on - site conditions.

[0099] Example 1 Static soaking process

[0100] For the ground pipeline blocked by silicate scale, the specific implementation method of the static soaking process is as follows: Prepare a silicate scale cleaning and treatment agent solution (for example, 5%, 10%, and the specific concentration used is determined according to the actual on - site situation). Inject the prepared treatment solution from one end of the pipeline until the inside of the pipeline is filled with the cleaning and treatment agent, and then close the valves at both ends of the pipeline and let it stand for 1 - 2 days.

[0101] Example 2 Dynamic circulation process

[0102] For the surface pipelines blocked by silicate scale, the specific implementation method of the dynamic circulation process is as follows: Connect the surface pipelines through high-pressure hoses with a circulating pump and a circulation pool on the ground; Prepare a silicate scale cleaning treatment agent solution (such as 5%, 10%, and the specific concentration used is determined according to the actual situation on site), and fill the prepared treatment solution throughout the process; Start the circulating pump to make the cleaning treatment agent solution flow rapidly throughout the process; Circulate for about 3 - 8 hours, and then stop the pump.

[0103] Example 3: Online co-injection process

[0104] For the surface pipelines blocked by silicate scale, the specific implementation method of the online co-injection process is as follows: Install a feeding port at the upstream part of the pipeline to be cleaned, prepare a silicate scale cleaning treatment agent solution (such as 5%, 10%, and the specific concentration used is determined according to the actual situation on site), and inject the prepared treatment solution into the pipeline through the feeding port by a metering pump on the ground. The cleaning treatment agent moves along with the water flow, so as to achieve the purpose of cleaning and removing scale. The specific time to stop feeding is determined by the actual situation on site.

[0105] By adopting the above technical solutions disclosed in the present invention, the following beneficial effects are obtained:

[0106] Compared with the prior art, the present invention has the following beneficial effects:

[0107] 1) It can dissolve the silicate scale formed in the pipeline under neutral or weakly alkaline conditions;

[0108] 2) The formed product can be biodegradable and has little environmental pollution;

[0109] 3) The dissolution rate is fast, shortening the construction time and saving costs;

[0110] 4) The on-site construction is simple and convenient.

[0111] The present invention uses edible radish as the main raw material to prepare an environmentally friendly silicate scale pipeline cleaning treatment agent that can efficiently dissolve silicate scale. The present invention is applied to multiple fields such as industrial water treatment, petroleum and petrochemical, and mechanical and electronic, and can effectively dissolve the insoluble silicate scale formed in the surface pipelines.

[0112] The above are only the preferred embodiments of the present invention. It should be noted that for those skilled in the art of this technology, without departing from the principle of the present invention, several improvements can be made, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. A preparation method and application of an environment-friendly silicate scale pipeline cleaning agent, characterized in that, The cleaning agent is composed of the following raw materials in parts by weight: Edible radish 10 - 40 parts, Pectinase 0.01 - 0.25 parts, Methanol 1 - 10 parts, Acid-base regulator 1 - 3 parts Penetrant 0.01 - 0.5 parts Dispersant 0.01 - 0.5 parts Deionized water 40 - 88 parts, The pH value of the pipeline cleaning agent is in the range of 7 - 9.

2. The environmentally friendly silicate scale pipeline cleaning and treatment agent according to claim 1, characterized in that The selected environmentally friendly raw material is edible radish, including types such as white radish, green radish, black radish, carrot, etc.

3. The environmentally friendly silicate scale pipeline cleaning and treatment agent according to claim 2, characterized in that The acid-base regulators used include: Inorganic strong and weak acids, organic strong and weak acids, weak acid and weak base, etc., such as HCl, NaOH, NH4Cl, Na2CO3, NaHCO3, etc.

4. The environmentally friendly silicate scale pipeline cleaning and treatment agent according to claim 3, characterized in that, The penetrant is compounded by anionic and non-ionic surfactants. Among them, the anionic penetrant selects sodium dodecyl benzene sulfonate (LAS), and the non-ionic penetrant selects fatty alcohol polyoxyethylene ether (AEO).

5. The environmentally friendly silicate scale pipeline cleaning and treatment agent according to claim 4, characterized in that, The dispersant selects sodium alkyl sulfosuccinate.

6. The preparation method of the environment-friendly silicate scale pipeline cleaning treatment agent according to any one of claims 1-5, characterized in that It includes the following steps: Sort and crush the edible radish. After the crushing rate reaches over 95%, add it to the reaction kettle; thermally soak at 80 °C for 8 h, and cool to 35 °C and continuously stir for more than 4 h; Add pectinase and yeast to the reaction kettle, soak at room temperature and continuously stir for 24 h, and filter the skin residue to obtain the edible radish extract solution; Add water, methanol, and acid-base regulator to the reaction kettle, and control the pH value of the system between 7 - 9; Slowly add a certain proportion of penetrant and dispersant to the reaction kettle and continuously stir evenly; Let it stand, filter to remove impurities, and obtain the silicate scale pipeline cleaning agent of the present invention.

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