39 results about "Glycine product" patented technology

This invention relates to the field of heterogeneous catalysis, and more particularly to oxidation catalysts including carbon supports having deposited thereon a noble metal and one or more optional promoters and to methods for their preparation. The invention further relates to the field of heterogeneous catalytic oxidation reactions, including the preparation of secondary amines by the catalytic oxidation of tertiary amines, such as the oxidation of an N-(phosphonomethyl)iminodiacetic acid to produce an N-(phosphonomethyl)glycine product.

This invention generally relates to processes for recovering solubilized noble metals from aqueous process streams, in particular, aqueous process streams generated in the preparation of an N-(phosphonomethyl)glycine product, for example, by noble metal-catalyzed oxidation of an N-(phosphonomethyl)iminodiacetic acid substrate. The process includes contacting the aqueous process stream with a noble metal adsorption media such as an ion exchange resin to remove solubilized noble metal from the process stream.

This invention relates to the field of heterogeneous catalysis, and more particularly to oxidation catalysts including carbon supports having deposited thereon a noble metal and one or more optional promoters and to methods for their preparation. The invention further relates to the field of heterogeneous catalytic oxidation reactions, including the preparation of secondary amines by the catalytic oxidation of tertiary amines, such as the oxidation of an N-(phosphonomethyl)iminodiacetic acid to produce an N-(phosphonomethyl)glycine product.

This invention generally relates to liquid-phase oxidation processes for making N-(phosphonomethyl)glycine (also known in the agricultural chemical industry as glyphosate) and related compounds. This invention, for example, particularly relates to processes wherein an N-(phosphonomethyl)iminodiacetic acid (NPMIDA) substrate (i.e., N-(phosphonomethyl)iminodiacetic acid, a salt of N-(phosphonomethyl)iminodiacetic acid, or an ester of N-(phosphonomethyl)iminodiacetic acid) is continuously oxidized to form an N-(phosphonomethyl)glycine product (i.e., N-(phosphonomethyl)glycine, a salt of N-(phosphonomethyl)glycine, or an ester of N-(phosphonomethyl)glycine). This invention also, for example, particularly relates to processes wherein an N-(phosphonomethyl)iminodiacetic acid substrate is oxidized to form an N-(phosphonomethyl)glycine product, which, in turn, is crystallized (at least in part) in an adiabatic crystallizer.

The invention provides a cleaning production technology of glycine. The glycine is produced through glycols solvents (ethylene glycol, propylene glycol and butyl glycol) or diol derivative solvents (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether) and methanol (or ethanol) organic solvents. After the organic solvents and catalyst methenamine are added in a reactor for producing the glycine, chloroacetic acid is added, then, nitrogen is slowly fed in, and a reaction for synthesizing the glycine is performed. After the reaction ends, glycine crystals are filtered out at the temperature ranging from 50 DEG C to 75 DEG C, and glycine products are obtained after methanol (or ethanol) washing, filtering and drying. After filtering liquid is cooled, ammonium chloride and mixed crystal solids including a small amount of glycine are obtained through filtration, and ammonium chloride products are obtained through washing. The reaction solvents are cyclically used.

The invention discloses a method for co-producing glycine and hydantoin, and an apparatus thereof. The method adopting hydroxyacetonitrile, ammonia, carbon dioxide and water, or hydroxyacetonitrile, ammonia, ammonium bicarbonate and water, or hydroxyacetonitrile, ammonium carbonate, carbon dioxide and water as raw materials comprises the following steps: carrying out an amidocarbonylation reaction on the raw materials at a temperature of 60-120DEG C under a pressure of 1.5-3.0MPa according to a molar ratio of hydroxyacetonitrile: ammonia: carbon dioxide: water of 1:3-5:2-4:46-50 in a reaction system to prepare an amidocarbonylation reaction solution; acidifying the amidocarbonylation reaction solution to obtain a hydantoin product, or carrying out ammonification hydrolysis on the amidocarbonylation reaction solution to prepare a glycine product The method and the apparatus can save the investment of apparatuses for prodcuign glycine and hydantoin, reduce the production cost, are convenient for adjusting the outputs of glycine and hydantoin, and especially overcome the disadvantages of incomplete hydrolysis, generation of iminodiacetic acid, many byproducts, difficult purification of glycine, and low yield of present hydantoin methods for preparing glycine.

The invention provides a clean production method for glycine. Glycine is produced by using a glycol solvent (ethylene glycol, propylene glycol and butylene glycol) or a diol derivative solvent (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether) and a methanol (ethanol) organic solvent. The clean production method comprises the steps: adding an organic solvent and a catalyst urotropine into a reactor for producing glycine, then, adding chloroacetic acid, and then, slowly introducing ammonia to carry out a reaction for synthesizing glycine; after ending the reaction, filtering a glycine crystal under the condition of 50-75 DEG C, and carrying out methanol (or ethanol) washing, filtering and drying to obtain a glycine product; and after a filtrate is frozen and cooled, filtering the filtrate to obtain ammonium chloride and a mixed crystal solid containing a small amount of glycine, and carrying out washing to obtain an ammonium chlorideproduct. A reaction solvent is recycled.

The invention discloses a preparation method of ferrous glycinate chelate, which is a food nutrition enhancer, and belongs to the technical field of preparation of ferrous amino acid chelate. The present invention uses glycine and ferrous chloride or ferrous carbonate as raw materials, adds antioxidants and nitrogen protection during the chelation reaction process, and adopts different organic solvents for sequential precipitation and elution during the product separation and purification process, thereby effectively The chelated ferrous iron in the product is separated from the inorganic iron, and impurity anions are better removed, and a product with excellent oxidation stability and water solubility is obtained. The ferrous glycinate chelate content in the synthesized product exceeds 80%, and the rehydration rate of the ferrous glycinate chelate is greater than 95%. The oxidation stability and aqueous solution stability of ferrous glycine chelate are far better than that of ferrous sulfate. The method of the invention has the advantages of being capable of industrial scale production, easy separation and purification of reaction products, simple operation, low cost, stable physical and chemical properties of the product, and the like.

The invention discloses a method for co-producing glycine and hydantoin, and an apparatus thereof. The method adopting hydroxyacetonitrile, ammonia, carbon dioxide and water, or hydroxyacetonitrile, ammonia, ammonium bicarbonate and water, or hydroxyacetonitrile, ammonium carbonate, carbon dioxide and water as raw materials comprises the following steps: carrying out an amidocarbonylation reaction on the raw materials at a temperature of 60-120DEG C under a pressure of 1.5-3.0MPa according to a molar ratio of hydroxyacetonitrile: ammonia: carbon dioxide: water of 1:3-5:2-4:46-50 in a reaction system to prepare an amidocarbonylation reaction solution; acidifying the amidocarbonylation reaction solution to obtain a hydantoin product, or carrying out ammonification hydrolysis on the amidocarbonylation reaction solution to prepare a glycine product The method and the apparatus can save the investment of apparatuses for prodcuign glycine and hydantoin, reduce the production cost, are convenient for adjusting the outputs of glycine and hydantoin, and especially overcome the disadvantages of incomplete hydrolysis, generation of iminodiacetic acid, many byproducts, difficult purification of glycine, and low yield of present hydantoin methods for preparing glycine.

The invention provides a method for separating mixed crystals of aminoacetic acid and ammonium chloride. The method separates mixed crystals of aminoacetic acid and ammonium chloride through two-step crystallization, respectively using glycol solvents and aqueous solutions as media, thereby obtaining high-quality Pure glycine product and by-product ammonium chloride. The invention makes full use of the difference in solubility between aminoacetic acid and ammonium chloride in glycol solvents and aqueous solutions, and realizes the separation of the two under mild operating conditions. The diol reagents used have low volatility, no hazards in the operation process, and are easy to recycle, which overcomes the problems of easy volatilization of methanol and high energy consumption for evaporation and recovery in the methanol separation process. The separation reagent is recycled in the whole process, which saves production cost and realizes pollution-free discharge.

The invention relates to the technical field of organic chemical industry, in particular to a hydantoin precursor solution and a method for preparing glycine by using the hydantoin precursor solution, the hydantoin precursor solution is an aqueous solution containing hydantoin amide and hydantoin components, and the molar ratio of the hydantoin amide to the hydantoin in the components is not lower than 2: 1; the method comprises the following steps: reacting a hydroxyacetonitrile material with a carbon dioxide source, an ammonia source and water in a synthesis device at 80-100 DEG C to prepare a hydantoin precursor solution, enabling the obtained hydantoin precursor solution to enter a hydrolysis device to contact with a solid catalyst containing a metal oxide, and hydrolyzing at 70-120 DEG C to obtain glycine hydrolysate; after the solid catalyst is separated from the glycine hydrolysate through the solid-liquid separation device, the glycine hydrolysate is concentrated and deaminated and then fed into the spraying device to be subjected to spray drying to obtain a glycine product, and the separated solid catalyst is returned to the hydrolysate device to be recycled. According to the method, the problem that hydantoin completely depends on self-hydrolysis and is difficult to be fully converted into a glycine product in an existing direct hydantoin method is solved.