40results about How to "Avoid solid waste" patented technology

The invention discloses a harmless treatment method of an electrolytic manganese residue. The harmless treatment method comprises the following steps that (1) the electrolytic manganese slag is driedand crushed and then subjected to low-temperature roasting to obtain a calcined material, and flue gas containing NH3 and SO2 is generated; (2) the obtained calcined material is subjected to water immersion and then subjected to solid-liquid separation to obtain a filter residue and manganese-containing filtrate; (3) the filter residue obtained from the separation is dried to obtain a harmless manganese residue, a precipitant is added to the manganese-containing filtrate to precipitate manganese, and after the completion of manganese precipitation, the solid-liquid separation is performed to obtain manganese-precipitated post-liquid and a manganese-containing product. The harmless treatment method of the electrolytic manganese residue is simple in process, mild in process conditions, shortin time required for the flow path and low in cost, and can effectively realize the harmless resource treatment of the electrolytic manganese residue, environmental protection is achieved, and the environmental protection pressure and production cost of related enterprises are reduced.

The invention belongs to the technical field of 4,6-dihydroxypyrimidine synthesis, and specifically relates to a method for preparing 4,6-dihydroxypyrimidine, comprising the following steps: (1) cyclization reaction; (2) cooling and dissolution; (3) ) Alcohol distillation under reduced pressure; (4) Acidification and separation; (5) Washing; (6) Adsorption; (7) Recovery of formic acid; (8) Recovery of sodium chloride; (9) Analysis. The method provided by the invention absorbs 4,6-dihydroxypyrimidine in the acidified wastewater through the adsorption resin, which not only improves the product yield, reduces the content of organic matter in the wastewater, solves the disadvantage of difficult wastewater treatment, but also improves the by-product The quality of sodium chloride reduces the content of organic matter in the by-product salt, which has good economic and social benefits.

The invention relates to a preparation method of environment-friendly printing and writing paper. Bleached chemical pulp and office waste paper are taken as raw materials, the office waste paper is used for replacing part of traditional bleached chemical pulp, so that large amount of solid office waste paper is treated while production cost is reduced, and the printing and writing paper is environment-friendly. Surface sizing is performed on paper with a surface sizing agent prepared from carboxymethyl cellulose, sodium silicate, a phryma leptostachya extract, gelatin and water, so that the environment-friendly printing and writing paper is not prone to worm damage, bacteria breeding or mildew and can be stored for a long time, and product quality and grade are improved substantially.

The invention provides a synthetic method of tazobactam acid, comprising the steps of (a) using 6-APA (6-aminopenicillanic acid) as a starting material and cetyltrimethylammonium hydrogensulfate as a catalyst to oxidize with oxone to obtain compound A; subjecting the compound A to deamination reaction to obtain compound B; esterifying the compound B to obtain compound C; (b) subjecting the compound C and 2-mercaptobenzothiazole to reduced pressure backflow to obtain compound D; ultrasonically vibrating the compound D and copper bromide to obtain compound E; reacting the compound E and 1H-1,2,3-triazole to obtain compound F; (c) allowing hydrogen peroxide and acetic anhydride to act on the compound F to obtain compound G; reacting the compound G with anisole to obtain tazobactam acid. Amino groups in 6-APA are diazotized directly, diazo groups are then removed, reduced pressure backflow and ultrasonic vibration are performed, hydrogen peroxide and acetic anhydride are used as oxidants, less byproducts are generated, and the yield and quality of tazobactam acid are effectively increased.

The invention discloses a method for preparing 6-nitro-1,2,4-acid oxygen body, which uses 2-naphthol as a raw material, sodium nitrite and dilute sulfuric acid to produce it through nitrosation in a tubular reactor 1‑Nitroso‑2‑naphthol, and hydrogenation with hydrogen in a fixed-bed reactor loaded with Raney nickel to generate 1‑amino‑2‑naphthol, and finally in a tubular reactor with nitrosyl Sulfuric acid is ring-closed by sulfonated diazonium and then nitrated by nitric acid to obtain the final product 6-nitro-1,2,4-acid oxygen body. The new synthesis method of 6-nitrate-1,2,4-acid oxygen body described in the present invention, this route uses hydrogen reduction and sulfonated diazonium ring closure with nitrosyl sulfuric acid, avoids traditional route to produce a large amount of The problem of solid waste is high, the utilization rate of atoms is high, the yield is also improved, and the safety factor is improved by using the tubular process, which is suitable for industrial production.

The present invention relates to a kind of refining method of chlorothalonil raw material isophthalonitrile, described refining method is carried out according to the following steps: add isophthalonitrile and solvent in the refining kettle with reflux condenser and tail gas absorption tower; add Dehydration reaction of dehydrating agent; cool down, add water dropwise to quench the reaction, add washing water to the organic phase to stir and separate liquid, add water to the organic phase, heat up azeotropic distillation, separate the suspension of isophthalonitrile and water through solid-liquid separation, Phthalonitrile drying. The refining method proposed by the present invention has the following advantages: 1) Mild process conditions, no need for high temperature and high vacuum, no blockage of equipment, and less energy consumption 2) Directly transform impurities into products, which not only avoids solid hazardous waste after refining, but also The quantity of products is increased, and the economic benefit is high.

The invention discloses a self-binding acid integrated production method of N,N-dimethylchloroethylamine and tetramethylethylenediamine, which comprises the following steps: 1) reacting with dimethylamine aqueous solution and dichloroethane Raw materials, adding an acid-binding agent with an equimolar amount of dimethylamine to the reaction raw materials for heating reaction, the heating reaction temperature is 30-90°C, the reaction pressure is 1-3MPa, and the reaction time is 3-8h; 2), the step 1) The resulting reaction product is post-treated to obtain an aqueous solution of N,N-dimethylchloroethylamine and tetramethylethylenediamine and dichloroethane; N,N-dimethylchloroethylamine and tetramethyl The aqueous solution of ethylenediamine is subjected to vacuum rectification, thereby respectively obtaining N,N-dimethylchloroethylamine as a light component and tetramethylethylenediamine as a heavy component. The method of the present invention is adopted to co-produce tetramethylethylenediamine while producing N,N-dimethylchloroethylamine.