36results about How to "Meet the requirements of green chemical development" patented technology

The invention discloses a concentration process for preparing fatty alcohol ether carboxylic acid from fatty alcohol ether carboxylate: in acidification reactor, add fatty alcohol ether carboxylate and acid prepared by oxidation method, acidification reaction occurs to generate acid form Fatty alcohol ether carboxylate, obtains the liquid phase product; In the layering equipment, the liquid phase product obtained in the previous step is left to stand for stratification, and the material that has been layered enters the next step; in the liquid-liquid separation equipment, the The material separated from the standing stratification obtained in the previous step obtains the lower aqueous phase and the upper layer material, and the upper layer material obtained after separation is concentrated to obtain the concentrated material; in the solid-liquid separation equipment, the concentrated material obtained in the previous step is subjected to solid-liquid separation. Liquid separation, the obtained solid phase material is used for recovery, and the obtained liquid phase material is once concentrated as the product. The invention not only has simple technological process and low operating cost, but also has safe and reliable process, high resource utilization and low energy consumption, and is a clean production process meeting the development requirements of green chemical industry.

The invention relates to a preparation method of p-methylsulfonylbenzoic acid. The method provided by the invention mainly comprises the following steps: (1) fusing; (2) preheating; (3) chemical oxidation; (4) solid-liquid separation; (5) neutralization for salt formation; (6) solid-liquid separation; (7) adsorption for removal of impurities; (8) solid-liquid separation; (9) acidification and crystallization; (10) solid-liquid separation; (11) washing; (12) dewatering and drying for obtaining a product p-methylsulfonylbenzoic acid; and (13) electrochemical oxidation. The preparation method provided by the invention is simple, has advantages of reasonable technology, low production cost, high product purity and safe process, is convenient to realize large-scale industrialization, and is a clean production technology which is used for preparing p-methylsulfonylbenzoic acid and accords with green chemical development requirements.

The invention develops a method for synthesizing phenothiazine compounds by using benzothiazole and derivatives thereof as well as 1-bromo-2-iodobenzene and derivatives thereof as raw materials and copper or copper salt / N-alkoxy-1H-pyrrolic amide system as a copper catalyst. The method is a brand-new method for synthesizing phenothiazine compounds. The method has the characteristics of low temperature, short reaction time, low solvent toxicity and wide substrate adaptability, and has wide application prospects in the aspect of preparation of medicines, pesticides and materials.

The invention discloses a method for synthesizing 1,4-butanediol by hydrogenation of 1,4-butynediol. The method comprises the following steps: performing hydrogenation reaction on 1,4-butynediol in a first-stage hydrogenation reactor on a modified Ni-based catalyst, and separating under pressure to obtain a first-stage hydrogenation product; the modified Ni-based catalyst has an active group of It is divided into Ni, and the auxiliary agent is at least one of Ru, K or Mg; the obtained one-stage hydrogenation product and Ru-based catalyst are carried out in a two-stage hydrogenation reactor for a two-stage hydrogenation reaction, and pressure relief is separated to obtain 1, 4-Butanediol; the active component of Ru-based catalyst is Ru. In the present invention, the modified Ni-based catalyst and Ru-based catalyst are combined, so that the conversion rate of 1,4-butynediol reaches 100%, the selectivity of 1,4-butanediol reaches 98%, and the catalytic activity is good. , high selectivity, mild reaction conditions, less by-products, and easy separation.

The invention relates to a leaching and separation method for a solid mixture of sodium phenate and sodium hydroxide, in particular to a method of leaching, solid-liquid separation, and evaporation-desolvent coupling technology, using acetone-water mixed solvent as the leaching agent. In the separation method for separating the solid mixture of sodium phenate and sodium hydroxide, the leaching agent can also be recycled while the sodium phenate and sodium hydroxide are separated. The separation method of the present invention has the advantages of reasonable process, simple operation, low operation cost and high utilization rate of materials, and is a clean production method meeting the development requirements of green chemical industry.

The invention relates to a methyIsuIfino benzaldehyde preparation method mainly comprising the steps of: (1) smelting; (2) preheating; (3) chemical oxidation; (4) solid-liquid separation; (5) alkali washing; (6) solid-liquid separation; (7) alcohol washing; (8) solid-liquid separation; (9) drying; and (10) electrochemical oxidation. The process provided by the invention is reasonable, the preparation method is simple, production cost is low, product purity is high, and the process is safe. The method is suitable for realizing large-scale industrialization. The process is a clean production process of methyIsuIfino benzaldehyde preparation. The process satisfies the requirement of green chemical engineering development.

The invention relates to a preparation method of glycollic acid from oxalaldehyde by intramolecular disproportionation. The preparation method comprises the following steps of: 1) performing disproportionation on calcium hydroxide solution and aqueous solution of oxalaldehyde and preserving heat to obtain a suspended calcium hydroxyl-acetate precipitate mixture; 2) performing acidulation precipitation with sulfuric acid on the mixture to obtain glycollic acid and calcium sulfate precipitate, filtering, concentrating the filtrate until the filtrate contains no water, and then filtering again; and 3) diluting the filtrate in step 2) with water, completely removing SO4(2-) ions by adding barium acetate or barium hydroxide into the filtrate, filtering out barium sulfate precipitate and active carbon, and concentrating the filtrate to obtain the glycollic acid solution. The preparation method has the advantages of: 1) low environmental pollution; 2) no special requirement on equipment, simplicity of operation, comprehensive usage of by-products and capability of realizing clean production during disproportionation at a normal temperature and under a normal pressure; and 3) high selectivity of reaction, few product impurities and high purity. The method provides the preparation of high-purity glycollic acid crystal with convenient conditions.

The invention discloses a method for preparing β-carbonyl sulfone. Using α-carbonyl diazonium compound and sodium aryl sulfinate as the reaction substrate, using cheap silver nitrate as the optimal catalyst, 1,10-phenanthroline as the ligand, and potassium persulfate as the oxidant, in acetonitrile and water A β-carbonyl sulfone compound is obtained through a coupling reaction in a mixed solvent. Compared with the prior art, the method of the invention has the following advantages: wide range of reaction substrates, short reaction time, relatively high reaction yield, mild reaction conditions and the like. The invention uses non-toxic and harmless reagents as reaction raw materials, has no harm to the environment, and meets the requirements of contemporary green chemistry development. The post-reaction treatment is relatively simple and convenient for separation and purification. In addition, this reaction can achieve gram-scale synthesis, laying the foundation for practical applications.

The present invention relates to a method for leaching-crystallization coupling separation of sodium phenate and sodium hydroxide solid mixture, in particular to a method of using acetone-water mixed solvent as leaching agent, leaching-cooling crystallization coupling separation of sodium phenate and sodium hydroxide The method of the solid mixture, when the separation method separates and obtains sodium phenate and sodium hydroxide, the leaching agent is also recycled. The separation method of the present invention has the advantages of reasonable process, simple operation, low operation cost and high utilization rate of materials, and is a clean production method meeting the development requirements of green chemical industry.

The invention discloses a method for synthesizing an aromatic primary amine in a circulating water phase system. According to the method, an aryl halide and ammonia water are taken as raw materials, water is taken as a solvent, a carbonate, a fluoride, a phosphate or a hydroxide of an alkali metal or an alkaline-earth metal or a compound which can be converted to a corresponding alkali in water is taken as the alkali, polyamine carboxylic acid and a salt type compound thereof are taken as ligands, and a copper source catalyst is adopted for catalyzing the formation of the aromatic primary amine from the aryl halide and the ammonia water. According to the method disclosed by the invention, the water is used as the solvent, any phase transfer of the catalyst is not required, and the catalyst, the ligands and the reaction solvent, namely the water, can be recycled, so that the environment-friendly property of reaction is effectively improved, the method is more in line with requirements of green chemical development, a substrate particularly has a wide range of applications, and the method further has broad prospects in the aspects of preparation of natural products, medicaments and pesticides.

The invention provides a preparation method for silicofluoride-contained polyurethane water repellent finishing agent, which is characterized in that the preparation method comprises the following specific steps that isocyanate and alcohol with fluoride are dissolved in a solvent, and the isocyanate and the alcohol with fluoride are mixed for reaction under protection of nitrogen; prepolymer R1 is obtained by adding at least one of polyether diol and polyester diol with a catalyst into the reaction system of the first step; organic oxosilane is dissolved in the solvent, the catalyst is added for obtaining organic oxosilane solution, and prepolymer R2 is obtained by adding the organic oxosilane solution into the prepolymer R1 which is obtained from the second step in a dropping way; and diol or diamine is used as chain extender to be added into the prepolymer R2 which is obtained from the third step, finally, small-molecule alcohol is added and mixed with isocyanate remained in the reaction system to be carried out reaction and end capping, and silicofluoride-contained polyurethane is obtained. The silicofluoride-contained polyurethane provided by the invention can be used as fabric finishing agent, leather coating agent, self-cleaning paint additive and the like, and has the advantages of remarkable finishing properties of water and oil repelling.

The invention relates to a separating and refining method of 2-chloro-5-chloromethylthiazole. High-purity 2-chloro-5-chloromethylthiazole is prepared through a crystallization method by taking crude 2-chloro-5-chloromethylthiazole as a raw material. The method comprises the following steps: (1) washing with water; (2) performing adsorbing and color-removing; (3) performing pressure filtration; (4) desolventizing; (5) adding an organic solvent; (6) crystallizing with a crystallization device, heating and melting; collecting to obtain high-purity 2-chloro-5-chloromethylthiazole. High-purity 2-chloro-5-chloromethylthiazole is prepared through the crystallization method of the self-made crystallization device according to the characteristics of low melting point of 2-chloro-5-chloromethylthiazole and high melting point of impurities. The separating method is simple, the production purity is high, the quality is stable, the energy consumption is low, the three-waste output is low, and the green chemical industry development requirements are met.