36 results about "Phosphonous Acids" patented technology

The invention discloses a phosphonate-base polymer with high adaptability and slump retaining properties, and a preparation method and application thereof. The phosphonate-base polymer has the following structural characteristics: the side chain is an ether type chain segment; and the polymer has two stages of adsorption groups, the primary adsorption group is a phosphonate or phosphite functional group, the secondary adsorption group is carboxyl, and the two functional groups are connected by an ester bond or amido bond. The weight average molecular weight of the phosphonate-base polymer with high adaptability and slump retaining properties is 10000-50000. The phosphonate-base polymer has a novel molecular structure, and thus, has the advantages of low doping amount, high water reducing rate, excellent slump retaining properties, and high sulfate and clay interference resistance. The preparation technique can implement industrialization, and thus, has broad market application space.

The invention discloses a preparation method of glyphosate, which is prepared by reacting disodium salt of aminomethylphosphonic acid and chloroacetate in water; the method avoids the existing iminodiacetic acid method, dialkyl phosphonite The defects in the production of glyphosate by ester method and chloromethyl phosphonic acid method have the characteristics of cleanness, environmental protection and high efficiency. The yield and quality of glyphosate have been significantly improved. It can be recycled, reducing waste liquid discharge, reducing material loss, greatly reducing production costs, and good economic benefits.

The invention discloses an alpha-hydroxy unsaturated alkylphosphonic acid compound as well as a preparation method and application of the alpha-hydroxy unsaturated alkylphosphonic acid compound. The alpha-hydroxy unsaturated alkylphosphonic acid compound has the structural formula I as shown in the specification. The preparation method comprises the steps: subjecting 2-ethyl-2-hexenal and hypophosphorous acid or hypophosphite to addition reaction in the existence of an acid catalyst to generate 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphorous acid; subjecting 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphorous acid and an oxidizing agent to reaction to generate 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphonic acid. 30-600g / t of 1-hydroxyl-2-ethyl-2-hexenyl-1-phosphonic acid is used as a flotation collector for bauxite, ilmenite, rutile, scheelite, wolframite, rare earth ores, tin ores, fluorite ores or lithium ores, and the pH value of a flotation solution is controlled at 4-12, so that a target ore and a gangue mineral can be effectively separated.

The invention discloses a preparation method of diethyl methylphosphonite, aiming to solve the problem that in the existing method, when ammonia gas is used as the acid-binding agent, the pH value of the reaction solution needs to be controlled between 7.0-8.5, accurately It is very difficult to control the pH value, and when the pH value is lower than that, a large amount of ethyl methylphosphinate by-products will be generated, and the use of organic amines as acid-binding agents has high toxicity, high price, and cumbersome recovery process. The problem of low recovery rates. The present invention uses methyl phosphine dichloride, ethanol and calcium oxide as main raw materials to prepare diethyl methyl phosphinate, which is a lower-cost diethyl methyl phosphonite suitable for industrial production. Methods of Esters Preparation. In the preparation of diethyl methylphosphonite, the present invention uses cheap calcium oxide instead of ammonia or organic amine as the acid-binding agent for the first time, which effectively reduces the production cost, and the calcium oxide is non-toxic, environmentally friendly, and has relatively Good economic value and social value.

The invention discloses a synthesis method of (1,1-dicyano-4-oxygen)-hexyl-3-oxindole phosphinate diethyl ester and its derivatives. The synthesis method comprises: adding DABCO-based ionic liquid Under catalysis, the first reactant, malononitrile, phosphite, and enone compound are heated and reacted relatively gently in a solvent to prepare the oxindole derivatives containing phosphonate groups. The synthesis method of the present invention has simple steps, is a four-component "one-pot" reaction, can selectively synthesize chain-like indole compounds with phosphonate groups, has short reaction time, and relatively high reaction yield , the ionic liquid catalyst used is cheap and easy to obtain, and it is a novel and efficient four-component reaction.

The invention relates to the technical field of mineral processing, and specifically discloses a flotation method for copper oxide ore. The flotation method of copper oxide ore is to mix the original ore of copper oxide ore with inhibitor, and then grind the ore to obtain a floatable pulp; and 2 times of scavenging, and then 4 times of beneficiation, the ore in each operation returns to the previous operation in sequence, and finally flotation to obtain copper oxide concentrate products, in which the collectors used are α-hydroxyarylphosphonous acid and alkyl Mixed collectors for xanthates. The copper oxide ore flotation method provided by the invention simplifies the treatment process of the copper oxide ore, and improves the grade and recovery rate of the obtained copper oxide concentrate product.

The invention relates to a method for producing poly aluminum chloride by using a byproduct of diethyl methylphosphonate production. The method comprises the following steps: (1) slowly adding a byproduct sodium tetrachloraluminate, rich in sodium tetrachloraluminate and obtained in a production process of diethyl methylphosphonate, into a dissolving kettle for dissolution, and collecting the solution; (2) adding ferric trichloride and hydrochloric acid; (3) sequentially adding aluminum hydroxide and calcium metaaluminate for polymerization reaction; (4) controlling the temperature to be 100 DEG C, and performing thermal reaction for 75min; and (5) cooling, and performing solid-liquid separation, wherein the filtrate is the product of the invention. The method disclosed by the invention has the advantages of simple process, high efficiency, low consumption, energy conservation, greenness and environmental friendliness and low cost.

The invention provides a method for high-selectivity synthesis of phosphinic acid ester / phosphorous acid ester / phosphoric acid ester derivatives containing different substituted functional groups; a metal salt is used as a catalyst, a P(O)-OH-containing compound and aryl boronic acid are used as reactants, and an alkali, an additive and an organic solvent are added into the reaction system. The method has the advantages that the catalyst is cheap and easy to obtain; the reaction conditions are mild, and the method is safe and reliable; the selectivity of the obtained target product is close to 100%, and the yield is as high as 90% or more. The method solves the deficiency that traditional synthetic phosphinic acid ester / phosphorous acid ester / phosphoric acid ester compounds have poor reaction selectivity, complex reaction steps and low yield and need to use reagents harmful to the environment, and has a good prospect in industrial application. The invention also provides the corresponding phosphinic acid ester / phosphorous acid ester / phosphoric acid ester derivatives correspondingly containing different substituted functional groups.