6 results about "Gliphosate" patented technology

The application discloses a temperature-sensitive molecular imprinting sensitive film, a preparation method thereof and application thereof in a glyphosate detection sensor, and belongs to the field of optical sensing technology and environmental monitoring. The application forms an imprinting cavity which is highly complementary to a template molecule in size and spatial configuration in a polymer network, realizes specific identification of a target molecule, and solves the problems of complex sample pretreatment and long detection period of the existing glyphosate detection method. The application introduces a temperature-sensitive material PNIPAM, realizes in-situ, non-destructive and reversible release of the template molecule by temperature control, discards the traditional destructive elution mode, avoids causing serious secondary environmental pollution, avoids the problems of swelling and corrosion of the imprinting cavity caused by strong acid or organic solvent, and causes irreversible damage to the structure of the imprinting cavity, which seriously affects the reuse frequency of the sensor and the detection stability.

This invention relates to a continuous crystallization method for glyphosate based on spherical seed crystal regulation. The continuous crystallization method includes the following steps: (1) continuously adding an acidic aqueous solution of glyphosate to a primary crystallizer and continuously adding an alkaline solution to control the pH at 1.0-1.8 to obtain a suspension containing primary crystals; (2) continuously adding the suspension obtained in step (1) to a secondary crystallizer and continuously adding an alkaline solution to control the pH at 1.9-3.0 to obtain a suspension containing spherical seed crystals; (3) continuously adding the suspension obtained in step (2) to a tertiary crystallizer, and obtaining glyphosate crystal products through crystal growth. This invention effectively reduces the intensity of secondary nucleation by segmented coupling control of nucleation, morphology regulation and crystal growth during continuous crystallization, and obtains glyphosate crystal products with narrow particle size distribution, large average particle size and good filtration performance.

The utility model relates to a glyphosate continuous crystallization device, wherein the primary static mixer and the secondary static mixer are same in structure, the upper end is all external with lye pipeline, and is equipped with glyphosate desolventizing solution feeding pipe and discharge pipe a respectively at both ends of the primary static mixer, is equipped with intermediate feeding pipe and discharge pipe b respectively at both ends of the secondary static mixer, the upper end of the primary crystallization kettle is communicated with the discharge pipe a through injection pipe a, the lower end is communicated with the intermediate feeding pipe through discharge pipe a, the outer wall of the primary crystallization kettle is equipped with interlayer, is installed with liquid level meter at side end, the both sides of upper surface are equipped with on -line thermometer, on -line ph meter and radar liquid level instrument in proper order, the intermediate position of upper surface is vertically rotatory and is equipped with stirring shaft, the upper end of stirring shaft is connected with stirring motor, and the lower end is connected with stirring paddle, the secondary crystallization kettle is same in structure with the primary crystallization kettle, the upper end is communicated with the discharge pipe b through injection pipe b, and the lower end is equipped with discharge pipe b, the utility model has the advantages of convenient operation and good production use effect.

A fully-continuous flow synthesis method of glyphosate is provided, which is performed by using a fully-continuous system including a plurality of pumps, a micromixer, a plurality of microchannel reactors, a plurality of tubular reactors, two back pressure valves, a plurality of reaction vessels, and a plurality of continuous crystallizers. Paraformaldehyde is depolymerized in the presence of an organic base, and the resultant depolymerization product undergoes an addition reaction with glycine to yield N, N-dihydroxymethylglycine, which further undergoes esterification with dimethyl phosphite (added in two batches) to generate a glyphosate ester. The glyphosate ester is adjusted to be acidic, hydrolyzed, desolvated, neutralized with a base, and purified to obtain glyphosate.

The application discloses a method and system for preparing paraformaldehyde from methylal, and relates to the technical field of paraformaldehyde synthesis. The method comprises the steps of methylal refining, catalyst preparation, catalytic oxidation reaction, paraformaldehyde preparation and tail gas treatment: taking crude methylal by-product of glyphosate as raw material, methylal with purity greater than or equal to 98% is obtained through rectification refining; iron-molybdenum catalyst is prepared by iron nitrate and ammonium molybdate; high-concentration formaldehyde is generated by catalytic oxidation under the conditions of 280-390 DEG C and air flow of 0.36-0.47 L / min; paraformaldehyde with purity greater than or equal to 96% is obtained through sodium hydroxide catalytic polymerization and hot air drying, and tail gas realizes recycling and incineration standard emission. The application solves the problems of insufficient resource utilization of methylal by-product of glyphosate, low yield, insufficient purity, poor catalyst stability and poor environmental protection of the existing methylal preparation process of paraformaldehyde. The application realizes the resource utilization of by-products, the formaldehyde yield is more than 70%, the catalyst has long service life, the process is environmentally friendly and efficient, and has significant industrialization potential.