12 results about "Methyl lactate" patented technology

This invention discloses a green synthesis method for acid-base bifunctional molecular sieves and its application. The method constructs acid-base sites in a one-step synthesis, yielding a molecular sieve catalyst containing acid-base bifunctional sites. This molecular sieve exhibits high activity and stable performance, and can be used as a catalyst to catalyze the isomerization of glucose to fructose. It significantly improves conversion efficiency in reactions catalyzing the isomerization of high-concentration glucose to fructose or its conversion to methyl lactate. Furthermore, this synthesis method avoids the use of environmentally harmful fluorinated mineralizers and inorganic acids, solving the problems of complex, time-consuming, and environmentally unfriendly synthesis processes of existing acid-base bifunctional molecular sieves. It also addresses the issues of low reaction efficiency and low selectivity of existing catalysts in reactions catalyzing the conversion of high-concentration glucose.

The application discloses a method for recovering lactic acid methyl ester by catalytic depolymerization of polylactic acid in one pot. The method comprises the following steps: mixing polylactic acid, amine nitrogen ligand and methanol, dissolving by adding a solvent, and then adding a n-butyllithium solution to carry out a depolymerization reaction; and after the reaction is completed, the solvent is removed by vacuum distillation, and the crude product is dried in vacuum to obtain lactic acid methyl ester product. The application does not need to synthesize a complex organic metal catalyst, the depolymerization condition is mild, and the generation of by-products such as low-molecular-weight oligomers is effectively reduced. Therefore, the application has the advantages of simplifying the catalyst preparation process, improving the depolymerization efficiency, reducing the cost and the like, and is suitable for industrialized recovery and cyclic utilization of polylactic acid.

The application designs a method for preparing optically active methyl fluoropropionate by using diethylamine sulfur trifluoride, comprising the following steps: fluorination reaction: under the protection of nitrogen, methyl S-lactate is added to a dry reaction kettle as raw material, the kettle temperature is cooled to a first reaction temperature, diethylamine sulfur trifluoride is added dropwise into the reaction kettle, after dropping, the reaction kettle is heated to a second reaction temperature, after the reaction is completed, the reaction mixture is added dropwise into saturated sodium / potassium bicarbonate aqueous solution to obtain R-2-fluoropropionic acid methyl ester; the molar ratio of diethylamine sulfur trifluoride to methyl S-lactate is 1-1.5:1, the method is high in efficiency, low in three-waste amount, short in reaction path, suitable for industrial production, and has economic value.

The invention relates to the technical field of industrial cleaning, and particularly discloses a low-toxicity degradable PCB (Printed Circuit Board) cleaning agent as well as a preparation method and application thereof. The low-toxicity degradable PCB cleaning agent is characterized by being prepared by mixing the following raw materials in percentage by weight: 50%-90% of D-methyl lactate, 10%-30% of isopropanol, 0-5% of glucoside and 0-5% of benzotriazole. The cleaning agent is reasonable in formula, all the components are synergistic, and the cleaning agent has the characteristics of being high in cleaning efficiency, mild to a base material and environmentally friendly, is free of residues after volatilization, is free of corrosion and damage to metal parts, is suitable for cleaning the surfaces of various materials such as electronic elements and metal workpieces, is especially suitable for precise cleaning of copper-containing metal parts, and has good application prospects. The application prospect is wide.

The invention relates to the technical field of high polymer materials, in particular to a one-step sequence-controlled hydroxy acid block copolyester preparation method, which comprises: carrying out amine catalysis on mandelic acid and bromoacetyl bromide in acetonitrile to form ester, cyclizing with sodium bicarbonate in N, N-dimethylformamide, and recrystallizing to obtain PDD; the preparation method comprises the following steps: carrying out Mannich reaction on 2, 4-di-tert-butylphenol to obtain a ligand H3L, complexing the ligand H3L with zirconium alkoxide, and carrying out methyl lactate treatment to obtain [ONOO]-Zr; pDD and epsilon-caprolactone are heated and polymerized in the presence of a [ONOO]-Zr catalyst, benzoic acid is terminated, and precipitation and purification are performed to obtain sequence-controlled block copolyester P (PDD-b-CL). Compared with other sequence-controlled block copolymer synthesis methods, the one-step sequence-controlled hydroxy acid block copolyester preparation method provided by the invention has the advantages of mild reaction conditions and simplicity and convenience in operation.

The application discloses a water-soluble morpholine lactic amide acrylate bio-based monomer and a polymer thereof, and belongs to the technical field of bio-based polymers.The application uses a lactic acid derived green solvent (methyl lactate, ethyl lactate, propyl lactate, butyl lactate and the like) and morpholine to synthesize morpholine lactic amide ester (MML) through amine ester exchange under solvent-free mild conditions, then synthesizes a polymerizable morpholine lactic amide acrylate monomer (MMLA) through acylation reaction and tests the performance through various means.The research finds that the water-soluble bio-based monomer (MMLA) of the morpholine lactic amide acrylate developed by the application has lower toxicity than traditional acrylate monomers and can be polymerized in a more environmentally friendly system, and the water-soluble polymer obtained after polymerization has high glass transition temperature and good thermal stability, and the water-soluble polymer with lower biological toxicity and good stability has application prospects in the development of biomedical fields.

The invention relates to the technical field of waste polystyrene treatment, in particular to a biodegradable modified waste polystyrene film and a preparation method thereof. The problem existing in the prior art is that waste styrene is modified into a biodegradable polystyrene material through conventional chemical grafting, an initiator or a catalyst needs to be additionally added, and the recycling cost is high. In order to solve the problems, the invention provides the biodegradable modified waste polystyrene film, through ester exchange reaction of methyl lactate and a PS molecular chain under specific conditions, a lactate group is directly grafted to a PS main chain, and the problem of non-degradability of PS is solved from the chemical structure. The whole modification process is carried out under heating and sealing conditions, the transesterification reaction is driven by utilizing the properties of reactants, an initiator or a metal catalyst commonly used in traditional grafting modification is omitted, the post-treatment step is simplified, and the production cost is reduced.

Janus dry facial mask based on birch emulsion electrospinning and its preparation method belong to the field of beauty and skin care materials technology. This invention first utilizes green bio-based solvents ethyl lactate or methyl lactate to optimize the extraction of betulinol from birch bark using an ultrasound-assisted method. Then, employing emulsion electrospinning technology and a Janus bilayer structure design, an asymmetric bilayer dry facial mask is constructed: the hydrophobic layer is made of biodegradable polylactic acid electrospinned, acting as a water-locking barrier to delay moisture loss; the hydrophilic layer is made by uniformly dispersing birch bark ethyl lactate extract (oil phase) in a mixed aqueous solution of polyvinyl alcohol and chitosan through high-speed shear emulsification to form a stable O / W type emulsion, followed by electrospinning to create a nanofiber membrane encapsulating active ingredients. The Janus dry facial mask exhibits excellent moisturizing, antioxidant, and anti-inflammatory effects, and requires no preservatives for dry storage and transportation. The process is simple and suitable for industrial production.

The invention relates to the technical field of epsilon-CL-20 crystal material preparation, in particular to a spherical epsilon-CL-20 crystal preparation method and system.The method comprises the steps that CL-20 and methyl lactate are prepared into a saturated solution, circulating concentration is carried out in a crystallizer through a nanofiltration membrane assembly, and meanwhile through control over the transmembrane pressure and the outflow rate of penetrating fluid, the spherical epsilon-CL-20 crystal is obtained; the supersaturation degree of the solution is precisely regulated and controlled, and closed-loop circulation of the solvent is realized through real-time recovery and resaturation of penetrating fluid. The green solvent methyl lactate is adopted, the membrane crystallization technology is combined for operation at normal temperature, and the method has the advantages of low energy consumption, zero solvent emission, controllable crystal morphology, uniform particle size distribution and the like, and is suitable for industrial continuous production of high-purity spherical epsilon-CL-20 crystals.

The application discloses a method for synthesizing methyl lactate by catalyzing selective oxidation esterification of 1,2-propanediol, which comprises the following steps: contacting oxygen, 1,2-propanediol and a catalyst in a reactor, and reacting to obtain methyl lactate; the catalyst is composed of a metal oxide carrier and gold elements loaded on the surface of the metal oxide carrier; in the catalyst, the mass of the gold elements is 0.1-2 wt% of the mass of the metal oxide carrier; and the metal oxide carrier is at least one selected from SiO2, ZnO, gamma-Al2O3, TiO2, CeO2, MgO and Sm2O3.

The application discloses a butter dirt on-line cleaning agent and a preparation method and application thereof. The butter dirt on-line cleaning agent comprises the following components in mass percentage: alkyl polyglycoside 8-20 wt%, fatty alcohol polyoxyethylene ether compound 8-25 wt%, composite chelating agent 10-15 wt%, methyl lactate 10-20 wt%, and the rest is deionized water; wherein the composite chelating agent is a mixture of sodium gluconate and glutamic acid. The butter dirt on-line cleaning agent is uniform and stable, can quickly remove butter dirt in an alkali washing tower of an ethylene production device, and is extremely convenient to operate when used, without stopping and opening the tank for cleaning, only needing to be added into the alkali washing tower with alkali liquor. Meanwhile, raw materials of the butter dirt on-line cleaning agent are non-toxic and non-polluting, the preparation method is simple, and the butter dirt on-line cleaning agent is suitable for large-scale production and application in industry.

This invention belongs to the technical field of functional foods and chemically modified materials, specifically relating to a dual-modified dietary fiber-based sugar-controlling health food and its preparation method. Using bamboo cellulose powder as a matrix, a multifunctional composite fiber structure is formed through a dual modification reaction of genipin aldehyde and lactic anhydride esterification. Betaine, generated by the condensation of methyl lactate and ethanolamine, is introduced as an organic small molecule coordinating component. Under optimized proportions and process conditions, this system forms a stable composite structure, significantly improving water absorption and swelling properties, structural stability, and glucose diffusion inhibition ability. The resulting powder particles are uniform, have good flowability, and exhibit excellent sugar-controlling performance and processing adaptability, making it suitable for the development of functional foods and nutritional regulation products.