22 results about "Dimethyl succinate" patented technology

The invention relates to a method for producing polybutylene succinate (PBS), the raw materials of which comprise: a) a first starting component: dimethyl succinate (DMS) in monomeric form, and b) a second starting component: 1, 4-butanediol (BDO) in monomeric form.

The present application provides a kind of dentin inducer for enhancing histone succinylation and its application, wherein the dentin inducer is dimethyl succinate.The present application finds that Wnt3a protein with clear odontogenic differentiation effect promotes odontogenic differentiation of dental pulp stem cells by increasing intracellular succinic acid content to induce histone succinic acid, and direct addition of succinic acid or succinic acid derivatives such as dimethyl succinate can play a Wnt3a replacement role, enhance stem cell histone succinylation and promote odontogenic differentiation of dental pulp stem cells.Furthermore, compared with Wnt3a protein class inducer, succinic acid or succinic acid derivative has the advantages of stable preparation and clear target, and is more suitable for clinical operation, which has important practical significance for promoting the clinical transformation of dental pulp dentin complex regeneration technology.

The invention discloses a method and an apparatus for preparing a purified 1, 4-butanediol composition. The method comprises the following steps: providing a dividing wall column; a 1, 4-butanediol composition to be purified is introduced into the dividing wall column, and the purified 1, 4-butanediol composition is prepared through the dividing wall column; the 1, 4-butanediol composition to be purified is prepared from gamma-butyrolactone, dimethyl succinate and 1, 4-butanediol. Effective separation and purification can be realized by only adopting one dividing wall column, so that not only is the equipment investment saved, but also the energy consumption is reduced.

The application relates to the technical field of batteries, and particularly discloses a sodium ion electrolyte and a preparation method thereof. The sodium ion electrolyte comprises a sodium salt, a solvent and an additive; the solvent comprises ether solvents and ionic liquids, wherein the ether solvents comprise glycol dimethyl ether and ethylene glycol dimethyl ether, and the ionic liquids comprise ether group-containing piperidine ionic liquids; and the additive comprises at least one of vinyl ethylene sulfite, dimethyl succinate and methylphenyl diphenyl phosphate. The sodium ion electrolyte system has good electrical properties, can help improve the coulomb efficiency of a sodium ion battery, and has the advantages of high safety.

The invention belongs to the technical field of PVC (polyvinyl chloride) modifiers, and particularly relates to a hard PVC plastic high-impact modifier and a preparation method thereof.The hard PVC plastic high-impact modifier is prepared by mixing dimethyl succinate, adipic dihydrazide, zinc acetate and ethylene glycol antimony, reacting at 160-165 DEG C for 3-5 hours and cooling to obtain reaction liquid; dimethyl terephthalate and hydroxyl-terminated 1, 4-polybutadiene are added into the mixture, tetrabutyl titanate is added at the same time, and a reaction is conducted for 2-4 h at the temperature of 230-250 DEG C; controlling the heating temperature and pressure in three stages, and finally stirring at 280 DEG C for condensation polymerization to obtain the high-impact modifier. The hydroxyl-terminated 1, 4-polybutadiene prepared by the preparation method disclosed by the invention has the advantages that the optimal cis-isomeric unit content is 71%, and the hydroxyl-terminated 1, 4-polybutadiene has very low glass transition temperature, good low-temperature chain flexibility and better impact modification effect on hard PVC (Polyvinyl Chloride) plastics.

The present application provides an ester hydrogenation catalyst, which is applied to the reaction of preparing 1,4-butanediol by hydrogenating dimethyl succinate, and the ester hydrogenation catalyst comprises a main catalyst and a carrier; the main catalyst comprises copper oxide, manganese oxide and aluminum oxide; the carrier comprises silicon oxide and zirconium oxide; the content of the copper oxide is 20-50% by weight percentage of the ester hydrogenation catalyst, the content of the manganese oxide is 5-15%, the content of the aluminum oxide is 10-25%, and the content of the carrier is 30-45%; the carrier has a large specific surface area, which is beneficial to the dispersion of active centers and improves the catalytic activity of the ester hydrogenation catalyst; there is a certain interaction between the zirconium species and the active centers, which limits the migration and agglomeration of the active centers, so that the ester hydrogenation catalyst exhibits excellent stability. The present application also provides a preparation method of the ester hydrogenation catalyst and the application of the ester hydrogenation catalyst in the preparation of 1,4-butanediol by hydrogenating dimethyl succinate.

The invention relates to the technical field of adhesives, in particular to a degradable water-based bio-based adhesive and a preparation method thereof. The water-based bio-based adhesive is prepared from the following components: 30 to 40 parts of polyether glycol, 40 to 50 parts of lysine diisocyanate, 1 to 5 parts of dibutyltin dilaurate, 40 to 60 parts of dimethyl succinate, 0.5 to 2 parts of organic bismuth catalyst, 40 to 60 parts of 1, 4-butanediol, 1 to 3 parts of tetrabutyl titanate, 5 to 10 parts of dimethylolpropionic acid, 20 to 30 parts of tannic acid, 6 to 10 parts of filler, 3 to 6 parts of antioxidant and 20 to 30 parts of deionized water. According to the adhesive disclosed by the invention, polyether glycol and lysine diisocyanate react to generate polyurethane, and dimethyl succinate can react with 1, 4-butanediol to generate poly (butylene succinate), so that a copolymer of polyurethane and poly (butylene succinate) is formed, and the adhesive has high bonding strength and good biodegradability at the same time; the pollution of the adhesive to the environment is reduced.

The application provides a preparation method of a hydrogenation catalyst, which comprises the following steps: mixing a complexing agent, a soluble copper salt, a buffer solution and water to obtain liquid A, mixing a silicon source, an alkali, a molecular sieve template agent and water, and hydrothermally treating to obtain liquid B, dropwise adding the liquid A into the liquid B, and transferring to a closed reaction kettle for crystallization under autogenous pressure after reaction to obtain the catalyst. In the application, the complexing agent is used as a structure directing agent to encapsulate Cu in the form of metal clusters in the pore channels of pure silicon zeolite, and the spatial restriction effect of the zeolite pore channels prevents the aggregation of Cu in the reaction process, so that the hydrogenation effect can be realized under a high dispersion degree, and the catalyst has high stability. The catalytic maleic acid dimethyl ester production butane diacid dimethyl ester reaction has high selectivity.

The invention provides a preparation method of bis (2, 2, 6, 6-tetramethylpiperidinyl) succinate, and relates to the technical field of organic synthesis. According to the method, a supported catalyst with porous aluminum oxide as a carrier, titanate as a catalytic active component and polyhydric alcohol as a ligand is adopted as an ester exchange catalyst of tetramethylpiperidinol and dimethyl succinate and has a good catalytic activity effect, and the product bis (2, 2, 6, 7-tetramethyl-4-piperidinol) has a good catalytic activity effect and can be used as a catalyst for ester exchange of tetramethylpiperidinol and dimethyl succinate. The 2, 2, 6, 6-tetramethylpiperidinyl) succinate prepared by the method is high in yield, high in purity, low in etherification product content and low in chromaticity.

The invention provides a method for preparing a lithium heteropolyacid catalyst by using a waste electrolyte and application of the method, and belongs to the technical field of catalysts, the lithium catalyst is extracted from the waste electrolyte, and organic components in the homologous waste electrolyte are catalyzed to synthesize a polyester product, so that the waste electrolyte is efficiently utilized, and the production cost is reduced. The purpose of saving resources is achieved; the five lithium heteropolyacid ionic liquid catalysts prepared by the invention have good activity on ester exchange reaction of ethylene carbonate and dimethyl succinate, the conversion rate is 86.43%, and the yield of the product PES is 75.17%; compared with common ionic liquid, the heteropolyacid ionic liquid has the characteristic of high melting point different from that of the common ionic liquid, and the heteropolyacid ionic liquid has the excellent characteristic of temperature control type reaction self-separation of high-temperature melting reaction-low-temperature solidification separation due to the performance.

The invention discloses a lithium salt catalyst based on waste electrolyte and a method for preparing TPU (thermoplastic polyurethane) by using the lithium salt catalyst, and belongs to the technical field of high polymer materials and waste recycling. The preparation method comprises the following steps: by taking a high-boiling-point substance (HBC, containing ethylene carbonate and propylene carbonate) recovered from waste electrolyte through reduced pressure distillation as a soft-segment precursor, carrying out condensation polymerization on the soft-segment precursor and dimethyl succinate to prepare a hydroxyl-terminated poly (ethylene succinate) (PES) prepolymer; mixing the prepolymer with aromatic dicarbamate (prepared from low-boiling-point substances in the waste electrolyte) according to a specific proportion, and synthesizing unmodified NIPU under the action of a lithium ion liquid catalyst (prepared from lithium metal salt in the waste electrolyte); and introducing a specific chain extender to optimize a modification process to obtain a high-performance NIPU product. All-component recycling (the utilization rate is larger than or equal to 90%) of the waste electrolyte is achieved, toxicity of traditional isocyanate is avoided, the product has excellent mechanical performance and thermal stability, the process energy consumption is reduced by 30% or above, and the method is suitable for the fields of elastic damping materials and the like.

A process for the production of dimethyl succinate and 1,4-butanediol comprising a 1,4-butanediol production process comprising a first esterification section and a hydrogenolysis section; and a dimet

The invention discloses a copper-based composite catalyst capable of regulating and controlling dimethyl succinate hydrogenation products and application, the catalyst takes Al-doped SiO2 as a carrier to load a CuMOx composite oxide and nano metal Cu0, the molar ratio of Cu to an auxiliary agent M in the CuMOx composite oxide is (0.2-3): 1, and the auxiliary agent M is selected from any one or more of Zn, Mn, Zr, Ce, Fe, In and Ga; based on 100% of the mass of the catalyst, the mass of the nano metal Cu0 is 1%-15%, the mass of the auxiliary agent M is 5%-30%, and the mass of Al is 1%-10%. Compared with a traditional simple coprecipitation and impregnation method, the preparation process of the catalyst has the advantages that the copper active center is more dispersed, the catalyst has high reaction activity and stability, and the catalyst can be prepared by controlling the doping amount of aluminum in the carrier and the loading amount of the nano metal Cu0. And the selectivity of high value-added products gamma-butyrolactone, 1, 4-butanediol and tetrahydrofuran in the catalytic dimethyl succinate hydrogenation reaction can be effectively adjusted.

This application discloses a production system and process for dimethyl succinate. The system includes a monoesterification reactor, a diesterification pre-reactor, a diesterification reactive distillation column, a methanol recovery column, a compressor, and a hydrogenation unit. The diesterification reactive distillation column has a bottom vapor inlet, a bottom outlet, a middle inlet, and a top vapor outlet. The methanol recovery column has a mixed steam inlet and a methanol vapor outlet. The outlet of the monoesterification reactor is connected to the inlet of the diesterification pre-reactor, and the outlet of the diesterification pre-reactor is connected to the middle inlet of the diesterification reactive distillation column. The top vapor outlet of the diesterification reactive distillation column is connected to the mixed steam inlet of the methanol recovery column, the methanol vapor outlet of the methanol recovery column is connected to the compressor inlet, and the compressor outlet is connected to the bottom vapor inlet of the diesterification reactive distillation column. Using the system described in this application to produce dimethyl succinate can reduce the energy consumption for methanol recovery.

The invention provides a process method for preparing dimethyl succinate by a backpack type reactive distillation dividing wall column, and belongs to the technical field of chemical production. The method comprises the following steps: by taking succinic acid and methanol as raw materials, carrying out single esterification reaction in a pre-reactor, and carrying out double esterification reaction on the generated reaction liquid in a knapsack type reactive distillation dividing wall tower to generate dimethyl succinate and water; the pre-reactor is a fixed bed reactor; the knapsack type reactive distillation dividing wall column comprises a main column and an auxiliary column, a common distillation section is arranged at the upper parts of the main column and the auxiliary column, a common stripping section is not arranged, the main column comprises a reaction section, a main column distillation section and a main column stripping section, and the reaction section adopts an externally-hung knapsack reactor; the auxiliary tower is not provided with a feeding hole and a reaction section; dimethyl succinate is extracted from a tower kettle of the main tower, excessive unreacted raw material methanol is extracted from the top of the backpack type reactive distillation dividing wall tower, and water is extracted from a tower kettle of the auxiliary tower. The two key processes of reaction and separation are integrated, so that the production process is simplified, the production efficiency is improved, and the equipment cost is reduced.

The application discloses a diluent for directly recycling hair dry tin paste, which is composed of an active agent, a stabilizer and a solvent; the active agent is composed of p-tert-butyl phenylacetic acid and 2-hydrazino-2-imidazoline hydrobromide; the stabilizer is composed of two or more than two of 4-sulfonic acid benzotriazole, hexadecylamine, trimethylolpropane and pentaerythritol; and the solvent is composed of dimethyl succinate and mixed five glycol dimethyl ether. Compared with directly scrapped hair dry tin paste, the hair dry tin paste diluent prepared by the method has the advantages of simple preparation process, low cost, fast and effective complete fusion with the hair dry tin paste, direct realization of secondary utilization of the hair dry tin paste, simple use, wide application in various types of hair dry tin paste and direct addition to the hair dry tin paste for mixing and stirring on an SMT production line.

The invention relates to the technical field of oilfield chemistry, in particular to a paraffin remover for a carbon dioxide flooding well and a preparation method of the paraffin remover for the carbon dioxide flooding well, and the paraffin remover for the carbon dioxide flooding well comprises the following raw materials in percentage by weight: 40-60% of terpinene, 8-10% of dimethyl succinate, 2-5% of surfactant and the balance of C9 aromatic solvent oil. The paraffin remover for the carbon dioxide flooding well and the preparation method of the paraffin remover are provided for solving the problem of paraffin precipitation of the carbon dioxide flooding well, the paraffin remover for the carbon dioxide flooding well is stable in paraffin dissolving rate under the low-temperature condition, the flash point of a formula system of the paraffin remover is higher than 45 DEG C, the components are easy to biodegrade, and the paraffin remover has the advantages of being safe and environmentally friendly.

The invention provides a dentin inducer for enhancing histone succinylation and application of the dentin inducer. The dentin inducer is dimethyl succinate. The invention finds that the Wnt3a protein with a definite dental differentiation effect promotes dental pulp stem cell dental differentiation after inducing histone succinic acid by increasing the content of succinic acid in cells, and the Wnt3a substitution effect can be played by directly adding succinic acid or succinic acid derivatives such as dimethyl succinate; the stem cell histone succinylation is enhanced; meanwhile, the dental pulp stem cell dental differentiation is promoted. Moreover, compared with a Wnt3a protein inducer, the succinic acid or the succinic acid derivative has the advantages of being stable in preparation and clear in target spot, is more suitable for clinical operation, and has important practical significance for promoting clinical transformation of a dental pulp and dentin complex regeneration technology.

A process for the production of dimethyl succinate and 1, 4 butanediol is disclosed. The process comprises a 1, 4 butanediol production process comprising a first esterification section and a hydrogenolysis section and a dimethyl succinate production process comprising a second esterification section and a hydrogenation section. The process is characterised in that at least one stream is taken from the dimethyl succinate production process and fed to the 1, 4 butanediol production process.

The application discloses a kind of dimethyl succinate 1,4-butanediol catalyst and preparation method, the catalyst includes CuO by weight percentage:31.4~43.8wt%, ZnO:12.4~18.6wt%, Co3O4:4.1~10.9wt%, MgO:3.3~8.2wt%, carbon nanotube:8~15wt%, the balance is alumina.Cu is used as active metal, the addition of auxiliary can promote Cu atom dispersion more uniform, grain is smaller;Preparation process is kneading, drying, calcination, and preparation process is simple: no need to configure solution, no need to carry out chemical reaction, no need to wash filtration, process is easy to control, almost no salt-containing wastewater is generated, processing is convenient;That is, preparation method is simple, preparation process uses less water, environment-friendly.

The invention discloses a high-performance copolyester elastomer and a preparation method thereof, and belongs to the technical field of copolyester elastomers. The high-performance copolyester elastomer prepared by the invention is prepared from the following raw material components in parts by mass: 60-70 parts of a butylene terephthalate copolymer, 2-4 parts of a flame retardant A, 1-3 parts of a flame retardant B, 30-40 parts of a toughening agent and 0.5-1 part of a compatilizer, wherein the butylene terephthalate copolymer is obtained by reacting and copolymerizing dimethyl terephthalate, dimethyl 2, 5-furandicarboxylate, dimethyl itaconate, dimethyl succinate and butylene glycol and then reacting and terminating with methyl 4-amino-3-nitrobenzoate; the flame retardant A is obtained by reacting cyanuric chloride and 4-benzyloxyaniline and then removing benzyl ether; the flame retardant B is obtained by reacting N-(4-hydroxyphenyl) maleimide with phenyl dichlorophosphate; the high-performance copolyester elastomer prepared by the preparation method disclosed by the invention is relatively good in mechanical property and flame retardance.

The invention provides a preparation method of dimethyl succinylsuccinate, which comprises the following steps: adding dimethyl succinate and diethylene glycol dimethyl ether into a reactor with an atmospheric distillation device, stirring and mixing; under a nitrogen protection condition, heating to a set temperature, dropwise adding a sodium methoxide methanol solution within a preset time, and after dropwise adding is completed, carrying out a heat preservation reaction; and after the reaction is finished, cooling to 20-30 DEG C, filtering through a filter pressing device, directly recycling mother liquor, adding a filter cake into water, stirring and heating, dropwise adding a sulfuric acid solution for acidification, adjusting the pH value, and carrying out suction filtration, washing and drying to obtain the final product dimethyl succinylsuccinate. The method is environment-friendly and low in production cost, avoids harsh reaction conditions, is suitable for industrial production, is high in product yield and purity, and can meet subsequent production requirements.