阅读说明：本技术 一种浓缩磷酸抗沉积剂及其制备方法 (Anti-deposition agent for concentrated phosphoric acid and preparation method thereof ) 是由 陈明祥 盛先芳 于 2019-11-29 设计创作，主要内容包括：本发明涉及一种浓缩磷酸抗沉积剂,它由其成分为氨基三甲基叉磷酸8-10份、膦羧酸3-5份、第一丙烯酸多元共元等聚物17-33份和第二丙烯酸多元共元等聚物33-42份、2-磷酸基-1,2,4-三羧酸丁烷6-10份和聚马来酸酐30-40份制成,采用此种含表面活性剂及有机活性物质的抗沉积剂对氟硅酸钾、氟硅酸钠的成核与结晶可以产生一定的抑制作用,在实验室中的阻垢率可达80％以上,而且工业试验的效果也比较好。由此可见,选择该添加剂可以有效减缓结垢,并使结垢物质疏松,从而有助于提高湿法磷酸过滤系统开车率,并缩短清理结垢物的时间,达到增产降耗的目的,具有极大的应用和推广价值。(The invention relates to a concentrated phosphoric acid anti-deposition agent, which is prepared from 8-10 parts of amino trimethyl idene phosphoric acid, 3-5 parts of phosphine carboxylic acid, 17-33 parts of a first acrylic acid multi-component isopolymer, 33-42 parts of a second acrylic acid multi-component isopolymer, 6-10 parts of 2-phosphoric acid-1, 2, 4-tricarboxylic acid butane and 30-40 parts of polymaleic anhydride, the anti-deposition agent containing a surfactant and an organic active substance can generate a certain inhibition effect on the nucleation and crystallization of potassium fluosilicate and sodium fluosilicate, the scale inhibition rate in a laboratory can reach more than 80%, and the industrial test effect is good. Therefore, the additive can effectively slow down scaling and loosen scaling substances, thereby being beneficial to improving the driving rate of a wet-process phosphoric acid filtering system, shortening the time for cleaning the scaling substances, achieving the purposes of increasing the yield and reducing the consumption and having great application and popularization values.)

1. The concentrated phosphoric acid anti-deposition agent is characterized by that its composition includes 8-10 portions of amino trimethyl idene phosphoric acid, 3-5 portions of phosphine carboxylic acid, 50-75 portions of multicomponent copolymer, 6-10 portions of 2-phosphoric acid-1, 2, 4-tricarboxylic acid butane and 30-40 portions of polymaleic anhydride according to weight ratio.

2. The concentrated phosphoric acid anti-deposition agent of claim 1, wherein: the multipolymer is prepared by 30-50 parts of a first acrylic acid multipolymer isopolymer and 60-65 parts of a second acrylic acid multipolymer isopolymer.

3. A process for preparing the concentrated phosphoric acid anti-deposit agent of claim 2, characterized in that the process comprises the steps of:

a. measuring 10-15% of acrylic acid, 30-34% of methyl acrylate monomer, 4-7% of sulfonate, 7-11% of isopropanol and 40-50% of deionized water according to mass percent for later use, and preparing ammonium persulfate accounting for 5% of the mass of the methyl acrylate monomer into aqueous solution with volume solubility of 40% for later use;

b. adding metered acrylic acid and methyl acrylate monomers, sulfonate, isopropanol and deionized water into a polymerization reaction kettle, controlling the temperature to be 36-41 ℃, starting a stirrer to stir uniformly, then dropwise adding the prepared ammonium persulfate aqueous solution into the reaction kettle for 50 minutes, after dropwise adding, heating the reaction kettle to 90 ℃, opening a condenser to reflux and preserve moisture for 1.5 hours, and after distilling out the residual isopropanol after reaction, obtaining a first acrylic acid multi-component copolymer and other polymers;

c. measuring 15-20% of acrylic acid, 25-30% of hydroxypropyl acrylate, 5-7% of AMPS, 7-11% of isopropanol and 40-50% of deionized water according to mass percent for later use, and preparing ammonium persulfate accounting for 3% of the mass of methyl acrylate monomers into an aqueous solution with the volume solubility of 30% for later use;

d. adding metered acrylic acid, hydroxypropyl acrylate, AMPS, isopropanol and deionized water into a polymerization reaction kettle, controlling the temperature to be 36-40 ℃, starting a stirrer to stir uniformly, then dropwise adding the prepared ammonium persulfate aqueous solution into the reaction kettle for 55 minutes, after dropwise adding, heating the reaction kettle to 87 ℃, opening a condenser to reflux and preserve moisture for 1.5 hours, and after distilling out the residual isopropanol after reaction, obtaining a second acrylic acid multicomponent copolymer isopolymer;

e. taking 8-10 parts of amino trimethyl phosphate, 3-5 parts of phosphonic carboxylic acid, 17-33 parts of a first acrylic acid multi-component isopolymer, 33-42 parts of a second acrylic acid multi-component isopolymer, 6-10 parts of 2-phosphoric acid-1, 2, 4-tricarboxylic acid butane and 30-40 parts of polymaleic anhydride, pouring into a blending kettle, and stirring for 15-30 minutes at room temperature to obtain the concentrated phosphoric acid anti-deposition agent.

Technical Field

The invention relates to the field of a concentrated phosphoric acid anti-deposition agent, and particularly relates to a concentrated phosphoric acid anti-deposition agent and a preparation method thereof.

Background

In the production process of wet phosphoric acid by a dihydrate method, potassium, sodium, silicon and harmful impurities in phosphorite easily cause the scaling of filtering and concentrating equipment and pipelines. The scaling substances are hard and difficult to clean, and the normal production is seriously influenced. Because the formation of the scaling substances has a great relationship with the impurity content of the phosphorite, the process index, the pipeline material and the like also have great influence on scaling, and no complete solution is available at home and abroad at present. Many phosphate fertilizer plants adopt a series of measures, such as reducing the acidolysis temperature of phosphate ore and increasingThe heat preservation measures, the change of the structure of the filter disc, the material of the pipeline and the like have certain retarding effect on the scale, but the effect is very little. By carrying out X-ray diffraction analysis on scale blocks collected in the field cleaning process of the filtering system, the components of the obtained scaling substances are mainly Na₂SiF₆、K₂SiF₆And CaSO₄··2H₂O；

When the contents of the scaling substances, carbonate, organic matters and the dispersive mud are high, the production generally needs to be stopped for cleaning the scales once within 7-8 days; if the content of harmful substances is higher, the scaling phenomenon is more serious, and some enterprises need to stop for scaling once every 3-4 days. Because the continuous normal operation of production is seriously influenced by scale removal, great economic loss is brought to enterprises. Therefore, it is very important to study how to prevent or slow down the formation of scaling substances and extend the continuous normal production cycle, and therefore, the existing problems need to be solved urgently.

Disclosure of Invention

In order to solve the above technical problems, the present invention provides a concentrated phosphoric acid anti-deposition agent and a preparation method thereof, which can achieve the purpose of enhancing the stability of the scaling substance in the supersaturated solution, thereby slowing down the scaling.

In order to achieve the purpose, the invention provides a concentrated phosphoric acid anti-deposition agent which is prepared from 8-10 parts of amino trimethyl idene phosphoric acid, 3-5 parts of phosphine carboxylic acid, 50-75 parts of multipolymer, 6-10 parts of 2-phosphoric acid-1, 2, 4-tricarboxylic acid butane and 30-40 parts of polymaleic anhydride according to weight ratio.

Preferably, the multipolymer is prepared by the components of 30-50 parts of first acrylic acid multipolymer isopolymer and 60-65 parts of second acrylic acid multipolymer isopolymer.

The preparation method of the concentrated phosphoric acid anti-deposition agent comprises the following steps:

a. measuring 10-15% of acrylic acid, 30-34% of methyl acrylate monomer, 4-7% of sulfonate, 7-11% of isopropanol and 40-50% of deionized water according to mass percent for later use, and preparing ammonium persulfate accounting for 5% of the mass of the methyl acrylate monomer into aqueous solution with volume solubility of 40% for later use;

b. adding metered acrylic acid and methyl acrylate monomers, sulfonate, isopropanol and deionized water into a polymerization reaction kettle, controlling the temperature to be 36-41 ℃, starting a stirrer to stir uniformly, then dropwise adding the prepared ammonium persulfate aqueous solution into the reaction kettle for 50 minutes, after dropwise adding, heating the reaction kettle to 90 ℃, opening a condenser to reflux and preserve moisture for 1.5 hours, and after distilling out the residual isopropanol after reaction, obtaining a first acrylic acid multi-component copolymer and other polymers;

c. measuring 15-20% of acrylic acid, 25-30% of hydroxypropyl acrylate, 5-7% of AMPS, 7-11% of isopropanol and 40-50% of deionized water according to mass percent for later use, and preparing ammonium persulfate accounting for 3% of the mass of methyl acrylate monomers into an aqueous solution with the volume solubility of 30% for later use;

d. adding metered acrylic acid, hydroxypropyl acrylate, AMPS, isopropanol and deionized water into a polymerization reaction kettle, controlling the temperature to be 36-40 ℃, starting a stirrer to stir uniformly, then dropwise adding the prepared ammonium persulfate aqueous solution into the reaction kettle for 55 minutes, after dropwise adding, heating the reaction kettle to 87 ℃, opening a condenser to reflux and preserve moisture for 1.5 hours, and after distilling out the residual isopropanol after reaction, obtaining a second acrylic acid multicomponent copolymer isopolymer;

e. taking 8-10 parts of amino trimethyl phosphate, 3-5 parts of phosphonic carboxylic acid, 17-33 parts of a first acrylic acid multi-component isopolymer, 33-42 parts of a second acrylic acid multi-component isopolymer, 6-10 parts of 2-phosphoric acid-1, 2, 4-tricarboxylic acid butane and 30-40 parts of polymaleic anhydride, pouring into a blending kettle, and stirring for 15-30 minutes at room temperature to obtain the concentrated phosphoric acid anti-deposition agent.

Compared with the prior art, the invention has the beneficial effects that:

the anti-deposition agent is prepared by compounding a special chelating surfactant, a solubilizer, a synergist and the like through a certain process, has a good slowing effect on the generation of easily-scaling substances in the production and filtration process of phosphoric acid, and enables the formed scaling substances to be loose and the adhesion with the pipe wall to be reduced;

na can be added by adding the scale inhibitor₂SiF₆、K₂SiF₆The limit supersaturation degree of (2) is increased, namely the metastable zone is wideIncreasing the content of Na₂SiF₆、K₂SiF₆Enhanced stability in supersaturated solutions, thereby mitigating fouling;

in conclusion, the concentrated phosphoric acid anti-deposition agent can achieve the aim of enhancing the stability of the scaling substances in the supersaturated solution so as to slow down scaling.

Detailed Description