14 results about "Β-propiolactone" patented technology

The method includes contacting one or more beta-propiolactone monomers with one or more phosphorus compounds in a solution under conditions such that a polypropiolactone polymer is formed. The solution includes one or more polar protic solvents and one or more phosphorus compounds. The phosphorus compounds contain phosphorus in ionic form, either covalently bound to another compound to form a zwitterion or ionically bound to another compound to form a salt.

The application provides a production device and process for synthesizing propiolactone based on homogeneous and heterogeneous composite catalysis, and relates to the technical field of propiolactone preparation. The propiolactone production device comprises a dehydration polycondensation reaction tank, a peristaltic pump, a pyrolysis reaction tank, a condensation tank, a finished product tank and a negative pressure conveying pump connected in sequence, wherein a homogeneous catalyst adding pipe is arranged on the dehydration polycondensation reaction tank; the pyrolysis reaction tank comprises a tank body, two layers of mesh plates are arranged in the tank body, and the two layers of mesh plates divide the tank body into an upper cavity, a middle cavity and a lower cavity; the upper cavity is connected with the condensation tank, a distributor is arranged in the upper cavity, and a liquid inlet end of the distributor is connected with a liquid outlet end of the dehydration polycondensation reaction tank; a heater and a heterogeneous catalyst are arranged in the middle cavity. The heterogeneous catalyst of the application is helpful for rapid vaporization of volatile components, and has the double advantages of homogeneous catalysts and heterogeneous catalysts, so that the overall reaction efficiency of lactic acid oligomers is effectively improved.

This invention discloses a method for preparing heteroatom porous beta molecular sieves, comprising the following steps: (1) mixing deionized water, tetrahydrofuran, sodium oxide, sodium aluminate, and zwitterionic polymer PAAn- b - PILm is mixed and stirred evenly, and tetraethyl orthosilicate is added dropwise. The mixture is stirred at 35-45℃ for 8-16 hours; (2) it is transferred to a reaction vessel lined with polytetrafluoroethylene, crystallized at 75-85℃ for 36-60 hours, and then crystallized at 130-150℃ for 8-16 hours; then dried and calcined. At the same time, the present invention also discloses the Sn-beta molecular sieve catalyst for preparing lactide using the beta molecular sieve and its preparation method and its application in the preparation of lactide. The reaction conditions of the present invention are mild and suitable for high concentrations of lactic acid raw materials, which reduces the production cost and produces lactide with high purity, thus solving the problems existing in the two-step preparation of lactide.

A method includes contacting one or more beta-propiolactone monomers and one or more phosphorous compound in a solution under conditions such that a polypropiolactone polymer is formed. The solution comprises one or more polar protic solvents and the one or more phosphorous compounds. The phosphorous compound comprises phosphorous in an ionic form that is either covalently bound to another compound to form a zwitterion or ionically bound to another compound to form a salt.

The invention discloses a thiourea acylthiourea metal complex catalyst, a preparation method thereof and application of the thiourea acylthiourea metal complex catalyst in lactide ring-opening polymerization. The preparation method comprises the following steps: (1) condensing 3, 5-bis (trifluoromethyl) phenyl isothiocyanate and para aminobenzoic acid in dichloromethane to obtain a carboxyl-containing product A; (2) performing acylating chlorination on the product A to obtain an intermediate B; (3) reacting the intermediate B with ammonium thiocyanate to generate an isothiocyanate intermediate C; (4) reacting the intermediate C with chiral primary amine to obtain a ligand intermediate D with a chiral center; and (5) coordinating the ligand intermediate D with a zinc compound or a titanium compound in an organic solvent to obtain the target catalyst. Molecules of the catalyst contain a chiral thiourea unit and an acylthiourea metal chelating unit at the same time, so that a monomer and an initiator can be activated synergistically. When being used for ring opening polymerization of lactide, the polylactic acid with high stereoregularity and narrow molecular weight distribution can be efficiently prepared at room temperature; the carbon nanotubes are added into a reaction system, so that the polylactic acid composite material with conductivity can be obtained.

The application discloses a kind of zwitterionic compounds and its preparation method and the preparation method of the contact lens with antifouling function. First, diisocyanate compound is reacted with hydroxyl-containing acrylate compound to obtain urethane-containing acrylate isocyanate half-enclosure, then it is reacted with active hydrogen-containing tertiary amine to obtain urea group, urethane group-containing acrylate monomer, and then zwitterionic is realized by β-propiolactone ring opening. The application also combines the obtained zwitterionic compound monomer to the contact lens by free radical initiation polymerization, improves the hydrophilicity of the lens, and obtains the contact lens with excellent antifouling function. The structure of this hydrogen bond, zwitterionic crosslinking network avoids the vicious development of contact lens biofouling adhesion, and is a promising strategy to solve the problem of contact lens biofouling adhesion.

The application discloses a rhabdovirus-free Sf9 cell screening method of double pretreated conditioned medium, relates to the technical field of biology, and obtains the rhabdovirus-free Sf9 cell by double pretreatment of the conditioned medium through cross-flow filtration and beta-propiolactone inactivation and hydrolysis, and combination of single cell cloning screening. The method realizes efficient virus interception and high-activity retention of nutritional factors, the single cell cloning formation rate is greater than 40%, and is suitable for virus-free cell bank construction and biological product production.

A method for efficiently making polypropiolactone and related copolymers from betapropiolactone utilizing carboxylate salts of onium cations is disclosed. In another aspect, the present invention provides a polymerization system comprising a combination of initiators and monomers that together enable the efficient production of polypropiolactone and related copolymers. Novel polymer compositions are disclosed that have structural and / or compositional properties that distinguish them from previously produced polymers and polymer compositions.

The invention belongs to the field of synthesis of biodegradable materials, and particularly relates to a beta molecular sieve catalyst, preparation thereof and application of the beta molecular sieve catalyst in catalyzing lactic acid liquid-phase one-step method to prepare lactide. When the catalyst is used for synthesizing a beta molecular sieve, Lewis acidic metal is introduced by adopting an in-situ method, so that the beta molecular sieve catalyst with the total acid content of 490-550 [mu] mol / g is obtained. According to the present invention, the acidity ratio in the beta molecular sieve is regulated and controlled by using the in-situ metal introduction method according to the acidity range required by the one-step synthesis of lactide from lactic acid, and compared with the post-introduction of the metal component, the high dispersion of the metal in the beta molecular sieve can be achieved, and the anchoring of the metal is achieved through the chemical bond so as to improve the stability of the catalyst; when the catalyst is used for catalyzing lactic acid to synthesize lactide, the lactide with high optical purity can be obtained with high selectivity, the purification difficulty of the lactide is reduced, the liquid-phase one-step method is operated under normal pressure / near normal pressure, the production condition is mild, and the catalyst is easy to separate and recover.

Disclosed are methods of efficiently making poly(3-hydroxypropionate) and related copolymers from beta propiolactone utilizing carboxylate salts of an onium cation. In another aspect, the present invention provides polymerization systems comprising combinations of initiators and monomers that together enable the efficient production of poly(3-hydroxypropionate) and related copolymers. Disclosed are novel polymer compositions having structures and / or compositional characteristics that differentiate them from previously produced polymers and polymer compositions.

Disclosed are methods of efficiently making polypropiolactone and related copolymers from beta propiolactone utilizing carboxylate salts of an onium cation. In another aspect, the present invention provides polymerization systems comprising combinations of initiators and monomers that together enable the efficient production of polypropiolactone and related copolymers. Disclosed are novel polymer compositions having structures and / or compositional characteristics that differentiate them from previously produced polymers and polymer compositions.

The invention discloses a binder, a pole piece, and an electrochemical device and an electronic device comprising the same, and belongs to the technical field of energy storage. The binder comprises a polymer, a conductive agent and a lactone slow-release acidifier, wherein the conductive agent comprises at least one of a carbon material and a metal oxide; the polymer comprises sodium alginate and polyacrylic acid; the lactone slow-release acidifying agent is prepared from at least one of gluconic acid-delta-lactone, beta-propiolactone and epsilon-caprolactone. The application can weaken the sliding of the linear structure of the binder, enhance the conductivity, improve the inhibition of the binder on the expansion of the silicon-based negative electrode, and effectively improve the cycle performance of the electrochemical device.

The application provides a method for synthesizing 3-hydroxyhexanoate by using n-butyraldehyde. The method specifically comprises the following steps: under the action of a Lewis acid catalyst and a sulfide assistant, n-butyraldehyde and ethenone are condensed to obtain a low-molecular polyester; the low-molecular polyester is converted into a beta-n-propyl propiolactone intermediate by performing depolymerization; and the intermediate and alcohol are reacted to obtain 3-hydroxyhexanoate. The raw material n-butyraldehyde and methanol used in the method are cheap and easy to obtain, and the other ethenone can be obtained by high-temperature cracking of acetic acid. The synthesis route is novel, the total yield can be up to 85%, almost no three wastes are generated, and the method has a good cost advantage. The Lewis acid catalyst and the sulfide assistant are used to synergistically catalyze the condensation of n-butyraldehyde and ethenone, and the selectivity is increased from 87% to 96%.