60results about How to "Reduce waste disposal" patented technology

The invention discloses an incineration treatment process for glyphosate mother liquor. The incineration treatment process comprises the following steps: the glyphosate mother liquor is fed to a membrane treatment device, concentrated mother liquor and a permeate liquid are obtained; the concentrated mother liquor is subjected to glyphosate powder extraction and subjected to primary oxidation, primary crystalizing separation, treatment with a membrane separation system and secondary crystalizing separation, a product enters an incineration system, tetrasodium pyrophosphate is obtained, and flue gas produced through incineration is subjected to secondary burning after dust separation and then is emitted. The membrane treatment concentration technique for the glyphosate mother liquor is combined with the incineration process for the first time and used for completely solving the problem about treatment of the glyphosate mother liquor, salt obtained after incineration can be recycled, the flue gas produced through incineration is subjected to dust separation and secondary burning, so that dioxin in the flue gas can be reduced remarkably, and the environmental requirements are met.

The invention discloses a synthesis rectifying method and equipment of methane chloride and belongs to the field of chemical methane chloride and organic silicon. According to the technical scheme, the method includes the steps of firstly, feeding raw material methanol and hydrogen chloride into a reactor, performing bubbling reaction to obtain a mixture of methanol, dimethyl ether, methane chloride, hydrogen chloride and water, and feeding the mixture into a reaction rectifying tower for rectifying; secondly, feeding the mixture discharged from the top of the reaction rectifying tower in thefirst step into a washing tower for washing so as to absorb the hydrogen chloride; thirdly, feeding the gas-phase material obtained after the second step into an alkali washing tower reactor to removeall the hydrogen chloride so as to obtain a gas-phase material at the top of the alkali washing tower; fourthly, feeding the gas-phase material obtained after the third step into an extraction rectifying tower to obtain the methane chloride at the top of the extraction rectifying tower. The method is low in investment, low in energy consumption, little in three waste, high in yield, capable of eliminating the environment pollution of an original process and capable of recovering the high-additional-value product.

A method of fabricating a polishing layer of a polishing pad includes determining a desired distribution of particles to be embedded within a polymer matrix of the polishing layer. A plurality of layers of the polymer matrix is successively deposited with a 3D printer, each layer of the plurality of layers of polymer matrix being deposited by ejecting a polymer matrix precursor from a nozzle. A plurality of layers of the particles is successively deposited according to the desired distribution with the 3D printer. The polymer matrix precursor is solidified into a polymer matrix having the particles embedded in the desired distribution.

The invention relates to a preparation method of 3-(2-methylindolyl-3-)pyrryl-2,5-dione, which comprises the following steps: (1) adding 2-methylindole, maleimide and Lewis acid in a mol ratio of 1.0:(1.0-1.5):(0.2-1.0) into reaction solvent, and reacting under reflux at room temperature to 100 DEG C for 5-24 hours, thereby obtaining a yellow white solution; and (2) evaporating to remove the solvent, adding water, stirring, carrying out vacuum filtration, and recrystallizing the obtained solid with ethanol to obtain the 3-(2-methylindolyl-3-)pyrryl-2,5-dione. In the process of preparing the 3-(2-methylindolyl-3-)pyrryl-2,5-dione, by using boron trifluoride and other Lewis acid as a catalyst, the reaction time is shortened, and the treatment of three wastes is lowered. The method has the advantages of higher yield, accessible raw materials, low cost, simple reaction operation and short reaction route, can easily implement industrial production, and has wide favorable application prospects.

There is provided a method for manufacture of 2-oxoimidazolidines of Formula I comprising one or more of the steps of converting an amine to an acylation agent, condensation of the acylation agent with a bi-functional compound of structure L-C(R₄)(R₅)—C(R₂)(R₃)—NHR₁, wherein L is a leaving group, and ring closure of the resulting urea. In this manner, certain 2-oxoimidazolidines may be manufactured that are useful intermediates for the production of Pramiconazole and structurally related compounds.

The invention relates to a synthesis method of mefenpyr-diethyl. The method comprises the steps of carrying out a reaction among 2,4-dichlorophenylhydrazine hydrochloride, ethyl glyoxalate and alkaliin a solvent, and carrying out a [3+2] cycloaddition reaction between obtained 2,4-dichlorophenylhydrazine ethyl glyoxylate hydrazone and ethyl methacrylate in a solvent under the function of a catalyst and an oxidant. According to the synthesis method, the starting raw materials are easy to obtain, the reaction time is shortened, the reaction path is short, the cost is low, the operation is simple, and three-waste treatment is lowered; under the same condition, the yield is higher, and industrial production is facilitated.

The invention relates to a preparation method of 3-n-butylamine-4-bromo-N-phenylmaleimide. the preparation method comprises the following steps: adding N-phenylmaleimide, n-butylamine and a brominating agent into a solvent, reacting at room temperature of minus 100 DEG C for 1-3 h, adding water and stirring after the end of the reaction, extracting, drying, concentrating, and recrystallizing to obtain 3-n-butylamine-4-bromo-N-phenylmaleimide. Yield of 3-n-butylamine-4-bromo-N-phenylmaleimide is high; reaction operation is simple; reaction route is short; and there is less ''three wastes'' (waste gas, wastewater and residue). The preparation method is easy for industrial production.

A billboard advertising apparatus and installation method include an under-layer base and an overlying image layer. The under-layer provides an opaque white surface to a billboard panel as well as protection for the overlying image layer. The image layer is a thin translucent color layer with advertising or message copy. With the presence of a base or under-layer, the cost to make the image layer may be significantly reduced.

The invention relates to a method for preparing 3-(4-methoxyphenyl)-succinimide. The method comprises the following steps: dissolving anisole, maleimide and lewis acid into a solvent; heating and refluxing to react for 3-20 hours; adding 2N hydrochloric acid, stirring, filtering and recrystallizing to obtain 3-(4-methoxyphenyl)-succinimide. The 3-(4-methoxyphenyl)-succinimide prepared by the method has high yield, low price, simple reaction operation, short reaction route, less three-wastes, and easiness for realization of industrial production.

Washed cleavage product (WCP) in a phenol manufacturing process is treated to remove sodium ions. The WCP is contacted with a cation exchange resin in hydrogen form, and then with anion exchange resin in free base or hydroxide form, to produce a WCP essentially free of sodium ions. The cation and anion exchange resins are regenerated with acid and caustic, respectively. The treatment improves productivity and product quality of new and existing phenol processes.

The invention provides a preparation method of 6,6-dimethyl-3-oxadicyclo[3.1.0]hexane-2,4-diketone. The method comprises the following steps of: oxidizing first ethyl chrysanthemate serving as a raw material in water serving as a solvent by adopting potassium permanganate and adding sulfuric acid for hydrolyzing to generate 3,3-dimethyl-1,2-cyclopropane dicarboxylic acid; and performing cyclization on the 3,3-dimethyl-1,2-cyclopropane dicarboxylic acid in a system consisting of acetic anhydride and sodium acetate to generate the 6,6-dimethyl-3-oxadicyclo[3.1.0]hexane-2,4-diketone. The invention has the advantages that: water is taken as a reaction solvent, so that increase in cost and environmental pollution caused by the use of a large quantity of organic solvents are avoided; and a large amount of sulfur dioxide gas produced by the use of sodium metabisulfite is eliminated, so that environmental pollution and treatment of three wastes are greatly reduced. The method has the advantages of environmentally-friendly reaction process, low environmental pollution, simple process and low cost, thereby being beneficial to industrial production.

The present invention relates to a technique for preparing an anhydrosugar alcohol using hydrogenated sugar as a raw material and, more specifically, to a technique for preparing a high-purity anhydrosugar alcohol by adding an acid to hydrogenated sugar (for example, hexitol) to convert same to an anhydrosugar alcohol, then distilling the converted liquid, and crystallizing the distilled liquid in a solvent, the technique removing a crystallization solvent from a crystallization mother liquor generated during a crystallization step and then introducing the resultant product together with the distilled liquid and the converted liquid into a distillation step, thereby being capable of improving the total distillation yield of the anhydrosugar alcohol, improving distillation efficiency by improving the mobility of a distillate, and further reducing the amount of generated waste and treatment costs and thus highly efficiently preparing the high-purity anhydrosugar alcohol at reduced costs.