47 results about "Ethylidenediphosphonic acid" patented technology

The invention discloses a method for decaling phosphoric acid concentration heat exchanger, namely a technique of adopting a washing-liquor composed of thin fluosilicic acid solution, organic phosphonic acid sustained-releasing agent and film forming matter and firstly washing the heat exchanger with water and then washing out the foul with the washing liquor. In the washing liquor, the fluosilicic acid is a 5%-20% thin acid, the organic phosphonic acid sustained-releasing agent includes amino tri- sub-methylene phosphoric acid, hydroxyl sub-ethyl di-phosphoric acid and hydroxyl-l, 1-subethyl di-phosphoric acid; the film forming matter includes nitrous phenylhydroxylamine ammonium salt and wuluotuopin as well as sodium molybdate. As using, adding in surface active agent alkyl sulphonate. The invention can make high efficiency and thorough decaling the graphite heat exchanger and simultaneously effectively control the corrosion of the washing liquor to the equipment and as compared with traditional washing methods, the invention improves the productivity of the equipment.

The invention relates to a continuous synthesis technique of hydroxyethylidenediphosphonic acid, which comprises the following steps: 1. mixing raw materials: mixing phosphorus trichloride and acetic acid in a mol ratio of 1:(2.8-3.0) in a mixing kettle; 2. sending the mixture into a tubular reactor: pumping the mixture into the tubular reactor through a diaphragm pump; 3. carrying out esterification reaction while controlling the temperature of the tubular reactor at 70-130 DEG C; 4. separating the reaction mixture in a gas-liquid separator for recycling; 5. carrying out hydrolysis reaction to obtain the hydroxyethylidenediphosphonic acid; and 6. distilling out acetic acid under negative pressure to separate the acetic acid from the product, wherein the acetic acid enters an acetic acid storage tank as a raw material. In the invention, the hydroxyethylidenediphosphonic acid is continuously produced in a semi-closed system, thereby changing the existing intermittent production mode and enhancing the production efficiency; and the invention overcomes the defects of low product yield, too many side reactions and high contents of phosphorous acid and phosphoric acid in other preparation techniques, and implements complete cyclic utilization of acetic acids with different concentrations.

The invention discloses a composite slow-release scale inhibitor suitable for a petrochemical wastewater reusing circulating water system. The composite slow-release scale inhibitor comprises 2-butane phosphate-1,2,4-tricarboxylic acid, hydroxy ethylidene diphosphonic acid, amino trimethylene phosphonic acid and zinc sulfate. After the composite slow-release scale inhibitor is adopted, by virtue of dynamic simulation experiment on oil refinery reuse water, the water quality inhibition rate is 86.18%; by virtue of the dynamic simulation experiment on ethylene plant reuse water, the water quality inhibition rate is 86.44%, and the scale inhibiting rate is 87.42%; the corrosion rate is reduced to 0.0168 mm/a and 0.0091 mm/a, which meets the anticorrosion requirement that the corrosion rate of China petrochemical circulating cooling water is less than 0.075 mm/a. Compared with the traditional polyphosphate carboxylate composite slow-release scale inhibitor, the composite slow-release scale inhibitor disclosed by the invention has the advantages of small addition amount and good corrosion inhibition effect and scale inhibition.

A method for synthesizing hydroxyl ethylidenediphosphonic acid belongs to synthesis of organo-phosphonic acid and is used in water stabilization. The phsophorus trichloride and acetic acid react at a temperature between 80 DEG C and 150 DEG C with an absolute pressure less than 760 millimeters mercury column, and the byproducts of hydrochloride and a few acetyl chlorides free of condensation are respectively retrieved and reused by combined recovery system of acetic acid and hydrochloric acid. The product of this method is obtained by hydrolyzing the acetylated hydroxyl ethylidenediphosphonic acid at a temperature between 80 DEG C and 150 DEG C with an absolute pressure no more than 760 millimeters mercury column; the collected hydrolysate of acetic acid after the distillation and the condensation is selected as raw material together with the acetic acid solution from the reclamation tower of acetic acid. The autoclave of 1000 litres daily produces products of 2500 kilograms with 60 % of solid content and less than 0.15 % of phosphorous acid; the yield rate of the products is more than 98 % calculated by phsophorus trichloride and is more than 96 % calculated by acetic acid.

The invention provides a sewage filter cleaning agent. The cleaning agent is used in oil fields to remove crude oil and impurities deposited on filter screens. The cleaning agent consisting of the following components in weight percentage: a. 5 to 10 percent of citric acid; b. 3 to 5 percent of hydrochloric acid; c. 0.05 to 0.2 percent of hydroxide radical-1, 1-ethidene diphosphonic acid sulfonic acid; d. 4 to 6 percent of alkyl phenol polyoxyethylene(14) ether; and d. the remaining being water. The cleaning agent has the advantages that, the cleaning agent can remove the majority of crude oil and impurities deposited on filter materials, and the filtering efficiency of the sewage filter which is cleaned is improved by 20 percent, the oil content of the sewage which is filtered is less than 4mg/l, and the oil content of the mechanical impurity is less than 10mg/l.

A retarding-corrosion antiscaling compound for the surface-evaporating air cooler used in high-hardness and high-basicity circulating water system is prepared from zinc sulfate 15-25 wt. portions, acrylic acid-acrylate copolymer 30-36 portions, hydroxy-1-1-ethylene diphosphonic acid 34-46 portions, and benzotriazole 4-6 portions. It still exhibits good performance under the condition of relatively bad quality of circulating water. Its advantages are its effect little affected by turbidity, adapting to wide pH range, high effect, and low dosage.

The invention relates to the synthesis and application technology field of compounds used for metal anticorrosion, and concretely discloses a novel rosin imidazoline corrosion inhibitor, a synthetic method and applications. The initial raw material of the provided compound is rosin acid, the raw material is single and the synthetic route operation is simple. The method for preparing a corrosion inhibitor from the synthesized compound is simple, the compound is dissolved in dimethyl formamide, then the obtained solution is dissolved in water, then 1-hydroxyethylidene-1,1-diphosphonic acid is added, and uniform stirring is carried out. The corrosion inhibitor is safe and environmentally friendly, and has excellent corrosion inhibition effects. The corrosion inhibitor can be used for oil and gas field ground gathering and storage and transportation pipes, prevents damage of corrosive gases to metal materials of steel and the like and reduces corrosion loss.

A planarization method including the provision of a wafer having a wafer surface. A pad is positioned for contact with the wafer surface and the wafer surface is planarized using the pad and a fluid composition that includes a chelating agent. The chelating agent is a water soluble multidentate chelating agent, preferably a water soluble bidentate ionic chelating agent, and more preferably 1,2-ethylenediphosphonic acid (EDP). A fluid composition for use in planarization of a surface of a wafer includes a chemically interactive component that interacts with the surface of the wafer and a chelating agent for reducing the metal ion contamination of the wafer during planarization. The chelating agent may be one of a water soluble multidentate chelating agent, preferably a water soluble bidentate ionic chelating agent, and more preferably 1,2-ethylenediphosphonic acid (EDP). Further, the fluid composition may include an abrasive component.

The invention discloses an environment-friendly water treatment barium-strontium anti-scaling agent and a preparation method thereof. Acrylic acid, methyl acrylate, ammonium persulfate, amino trimethylene phosphonic acid, distilled water, ethylene diamine tetraacetic acid, unsaturated organic acid, sodium tripolyphosphate, maleic anhydride, hydroxyethylidene diphosphonic acid and a catalyst are weighed according to a weight ratio. According to the anti-scaling agent, calcium carbonate and calcium phosphate micro-crystals are dispersed; even if scales are generated, the scales are relatively loose and are easily washed away by flow; the anti-scaling agent is excellent in corrosion inhibition, non-toxic and high in thermal stability; the using amount of the anti-scaling agent is as small as 1 to 10mg/L, and the using cost is reduced; the effect is enduring, after the anti-scaling agent is placed for a month at the temperature of 50 to 60 DEG C, the anti-scaling effect is 98 to 100 percent, and the anti-scaling agent is mainly applied to a recycled sewage and oil delivery pipeline of an oil field and is used for preventing metal ions from scaling.

A scale inhibitor for an industrial cooling water system contains raw materials of ultrapure water, polyacrylic acid, binary acylic copolymer, benzotriazole, hydrolyzed polymaleic acid, ethanol, phenol polyoxyethylene, hydroxyethylidene-1,1-diphosphonic acid, dodecyl dimethyl benzyl ammonium chloride, amino trimethylene phosphonic acid and polyamino polyether methylene phosphonate. The scale inhibitor for the industrial cooling water system is applicable to industrial water systems, boiler systems and central air conditioning systems; the phosphorus value in exterior drainage water is 0.05-0.25 mg/L; the scale inhibitor for the industrial cooling water system achieves very good complexing ability for metal ions in the water and effectively stops scaling; the crystal lattice sequence of sediments is effectively destroyed, the corrosion rate of carbon steel is 0.001-0.005 mu m/a<-1>, the adhesive speed is 1.5-3 mcm and the scale inhibiting ratio of calcium carbonate is 99.5-99.9%, the dispersion effect is good and a very good inhibiting and eliminating effect on the sediments in the water is achieved.

The invention relates to a preparation process for high-purity low-arsenic hydroxyethylidene diphosphonic acid. The preparation process comprises the following steps: with phosphorus trichloride, acetic acid and ammonium thioacetate as raw materials, controlling process conditions at first, reacting acetic acid with phosphorus trichloride in a reaction vessel to produce hydroxyethylidene diphosphonic acid and adding ammonium thioacetate in the process of the reaction; and then subjecting an obtained material to concentration and air flushing to remove impurities, adding ammonium thioacetate and carrying out arsenic removal and centrifugation so as to obtain the high-purity low-arsenic hydroxyethylidene diphosphonic acid. According to the invention, scientific technology is employed for product purification, no other substance like a crystal nucleus and a crystallization promoter is added, so no new impurity is introduced. Hydroxyethylidene diphosphonic acid in the high-purity low-arsenic hydroxyethylidene diphosphonic acid prepared in the invention is more than 95%, and arsenic content in the high-purity low-arsenic hydroxyethylidene diphosphonic acid is less than 2 ppm; the preparation process overcomes problems in packaging, transporting and on-site application of liquid hydroxyethylidene diphosphonic acid and broadens the application fields of the high-purity low-arsenic hydroxyethylidene diphosphonic acid.

The invention discloses a reverse osmosis membrane scale inhibitor and a preparation method thereof. The scale inhibitor is prepared from polyepoxysuccinic acid, amino trimethylene phosphonic acid, diethylenetriamine pentaacetic acid pentasodium salt, hexadecyl tributyl phosphonium bromide, distilled water, dodecyl triphenyl phosphonium bromide, methoxymethyl triphenyl phosphonium bromide, 1, 2-benzisothiazolin-3-one, hydroxyethylidene-1,1-diphosphonic acid, polyacrylic acid and benzotriazole. The usage amount of the scale inhibitor is less and is only 1 to 5 mg/L; the effect is lasting, i.e., after the scale inhibitor is placed for one month at 60 to 80 DEG C, the scale inhibiting ratio is 96 to 100 percent; the reverse osmosis membrane scale inhibitor has a good sterilizing effect and positive effects in improving calcium scale resistance and iron dispersing property.

The invention provides a continuous production method of a hydroxyethyl diphosphonic acid crystal. The specific operation method comprises the following steps: performing preheating and gas-liquid separation on a hydroxyethyl diphosphonic acid liquid product with active content being 50 to 65 percent, and throwing into a distilling kettle continuously at constant speed; when performing distillation and concentration until the material active content is more than or equal to 70 percent, completing step-by-step automatic material transfer on high-temperature materials among crystallization kettles which are connected in tail series after condensation, and performing step-by-step continuous crystallization under the conditions of stirring and naturally cooling; performing circular condensation and cooling in the n-stage crystallization kettle and maintaining the system temperature to 20+/-2 DEG C; and after performing crystallization completely, performing separation and drying treatmentto obtain a hydroxyethyl diphosphonic acid crystal product with the active content being more than or equal to 98 percent. The traditional single-kettle closed crystallization method is changed into aflow line crystallization method more suitable for industrialization, so the prepared crystallization granularity is proper, crystal aids and crystal nucleuses are not added in the crystallization process, explosive crystallization is avoided, and the continuous production method of the hydroxyethyl diphosphonic acid crystal is suitable for industrialization.

A polishing composition for polishing a disk substrate, comprising (A) selected from the group consisting of phosphoric acid, phosphate and pyrophosphoric acid, phosphonic acid, phosphinic acid, hydroxyethylene diphosphonic acid, nitrilotri( (Methylenephosphonic acid), phosphonobutanetricarboxylic acid, and salts thereof, (B) colloidal silicon dioxide, (C) water, and (E) diammonium iron edetate .