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Scale inhibitor combination, preparation method thereof and sewage treatment method

The technology of a composition and a scale inhibitor, which is applied to the field of scale inhibitor composition and its preparation and sewage treatment, can solve the problems of increased scaling, increased cleaning work, increased alkalinity and the like, and achieves the promotion of flocculation effect, Simple to use and stable anti-scaling performance

Active Publication Date: 2010-06-23
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0004] If the alkali slag produced in the production process of the refinery directly enters the sewage treatment system (especially the air flotation unit) for treatment, the pH value of the sewage will increase (the range is around 10), the alkalinity will increase, and the scaling will increase. Low levels of scaling ions such as calcium and magnesium can also lead to fouling of water pump impellers and pipes. Scale cleaning of water pipes and pump impellers is required every half a month, which not only affects the normal operation of the sewage treatment system operation, the sewage treatment system cannot work continuously, which seriously affects its long-term operation, and the increase in cleaning work and investment in sewage treatment operation seriously affects the benefits of the enterprise
However, currently commonly used scale inhibitors, such as small molecule organic scale inhibitors containing phosphorus and polymer scale inhibitors, are easily absorbed by oil and other substances in the sewage treatment system or oxidized and decomposed to lose their effect. Therefore, it is urgent to develop Scale inhibitor suitable for sewage treatment system to solve its scaling problem

Method used

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  • Scale inhibitor combination, preparation method thereof and sewage treatment method
  • Scale inhibitor combination, preparation method thereof and sewage treatment method

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preparation example Construction

[0016] The preparation method of the scale inhibitor composition provided by the invention comprises mixing the phosphorus-containing small molecule organic scale inhibitor, polymer scale inhibitor, flocculant, water-soluble inorganic zinc salt and water.

[0017] Wherein, the mixing method includes dissolving the flocculant in water, adding water-soluble inorganic zinc salt, mixing evenly, and then mixing the obtained solution with phosphorus-containing small-molecule organic scale inhibitor and polymer scale inhibitor.

[0018] After the flocculant is dissolved in water and the water-soluble inorganic zinc salt is added, the mixing conditions may include stirring at a temperature of 0-100°C for 1-8 hours, preferably stirring at a temperature of 20-80°C for 2-6 hours. During the process of adding the water-soluble inorganic zinc salt, the pH is controlled to be 1-7, preferably 2-6. The pH can be adjusted with conventional soluble inorganic and / or organic acid and alkali solut...

Embodiment 1

[0027] 13 grams of polyaluminum chloride (Gongyi Yujie filter material factory) was added to a 200 milliliter beaker, 25 milliliters of deionized water was added to dissolve it, and 18 grams of zinc chloride (Beijing Chemical Plant) was added under agitation. During the process, a hydrochloric acid solution with a volume concentration of 10% is used to control the pH to be 2-6. After the zinc chloride is completely dissolved, add water to make the total amount of the solution reach 100 grams, take 70 grams of it and place it in a 200ml beaker, add 9 grams of HEDP and 21 grams of acrylic acid-2-acrylamido-2'-methylpropylsulfonate Acid copolymer (Beijing Linhua Water Quality Stabilizer Factory, ZF329LH), stirred, dissolved and mixed to obtain scale inhibitor composition D1. The prepared scale inhibitor composition was transferred to a 150ml ground-mouth Erlenmeyer flask and stored at room temperature until use.

Embodiment 2

[0029] Weigh 18 grams of zinc chloride and dissolve in 20 milliliters of deionized water for later use. Under the condition of 80 DEG C, get 20 grams of 50% aluminum sulfate solution in the there-necked flask with stirrer, thermometer, first drop 5 grams of phosphoric acid, then add dropwise the above-mentioned zinc chloride solution and 25 grams of sodium silicate solution ( The mass concentration is 3.24%). During this process, the pH value of the solution is controlled to be 1-7, and deionized water is added to make the total amount of the solution reach 100 grams, and stirred for 2 hours. Take 70 grams of it in a 200ml beaker, add 9 grams of HEDP and 21 grams of acrylic acid-2-acrylamide-2'-methylpropylsulfonic acid copolymer (Beijing Linhua Water Quality Stabilizer Factory, ZF329LH) respectively, and stir to dissolve After mixing, the scale inhibitor composition D2 is obtained. The prepared scale inhibitor composition was transferred to a 150ml ground-mouth Erlenmeyer fl...

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Abstract

The invention relates to a scale inhibitor combination, a preparation method thereof and a sewage treatment method. The scale inhibitor combination is characterized in that the combination comprises small molecular organic scale inhibitor containing phosphor, polymer scale inhibitor, flocculating agent, water soluble inorganic zinc salt and water, wherein the molecular weight of the small molecular organic scale inhibitor containing phosphor is 100 to 2000. The scale inhibitor combination of the invention is single preparation, the use and the operation are simple and the scale inhibition performance is stable; and the scale inhibitor combination can promote the flocculation effect.

Description

technical field [0001] The invention relates to a scale inhibitor composition, a preparation method thereof and a sewage treatment method. Background technique [0002] At present, there are many researches and applications on scaling in industrial circulating water systems at home and abroad, but less research on scaling in sewage systems. Only add resistance to sewage treatment units with less oil content, suspended solids, and COD content, and better water quality. Fouling agent inhibition system fouling problem research, such as membrane treatment system. USP6416668 introduces a method for applying scale inhibitors in membrane treatment systems. Japanese Patent Publication No. 09-099712 introduces a method of adding a scale inhibitor when the treated clear liquid of the external drainage of the papermaking inorganic board manufacturing project of a paper mill is processed in a filtration system. The above two methods are for the research of the situation when the sewag...

Claims

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Application Information

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IPC IPC(8): C02F5/08C02F1/52
Inventor 张莉桑军强高峰李本高
Owner CHINA PETROLEUM & CHEM CORP
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