98results about How to "The process method is environmentally friendly" patented technology

The invention discloses a method for recycling low-grade lead and zinc in pyrite cinder, and belongs to the technical field of ore dressing metallurgy. The method comprises the following steps of: adding pulverized coal and adhesive into the pyrite cinder containing lead and zinc, regulating the moisture, performing wet grinding, pelletizing, drying pellets at a low temperature, performing high-temperature reductive roasting by using gas, collecting dust from the roasting smoke, and thus obtaining lead and zinc mixed concentrate, wherein the roasted pellet ore is an iron-making raw material containing 54 to 60 percent of iron and less than 0.3 percent of lead and zinc. By pelletizing the cinder, carrying out combined reductive roasting with the pulverized coal and the gas and recovering the lead and the zinc from the smoke according to the method, lead and zinc resources which are difficult in lead-zinc-sulfur flotation separation and are greatly lost in the pyrite cinder are efficiently recovered, and the iron resource in the pyrite cinder is also efficiently utilized.

The invention relates to a method for preparing polyimide by performing polymerization reaction in supercritical carbon dioxide, belongs to the technical field of synthesis of polyimide polymer, and solves the technical problems that an organic solvent is needed and subsequent treatment difficulty is high in the synthesis reaction process of the polyimide in the prior art. According to the method, the polyimide is synthesized by taking acid anhydride or aniline as a blocking agent and the supercritical carbon dioxide as a medium. The method comprises the following steps of: adding dianhydride, a diamine monomer, a catalyst and the blocking agent into a reaction kettle at one time or in batches, introducing carbon dioxide, and gradually raising temperature and pressure to ensure that a system is in a supercritical state; and polymerizing at certain temperature and pressure to obtain a polyimide product with a good shape and high performance. The organic solvent is not used, the product is pure, subsequent treatment is not needed, the reaction medium is non-toxic and pollution-free, and the method is an economic, practical and environment-friendly process method for synthesizing and preparing the polyimide.

The invention discloses a stretchable strain sensor based on polyurethane fiber and a preparation method of the strain sensor. The polyurethane fiber is taken as a matrix, the surface of the matrix issequentially wrapped with an inner conductive structure adopting a graphene nanosheet layer and an outer conductive structure adopting a collaboratively conductive network layer of carbon black and single-walled carbon nanotubes. The strain sensor has good softness, stretching characteristic and large-scale integration characteristic and can serve as a wearable device compatible with skin.

The invention relates to the field of extraction and separation of traditional Chinese medicine, in particular to a new compound extracted, separated and identified from a Portulaca oleracea L. medicinal material as well as an extraction and separation method and an application of the new compound, and specifically provides a compound Oleraciamide E in Portulaca oleracea L. as well as the extraction and separation method and the application of the compound Oleraciamide E. The extraction and separation method of the new compound comprises steps as follows: water decoction extraction, ethyl acetate extraction, macroporous resin column chromatography, silica-gel column chromatography, ODS (Octadecylsilyl) medium-pressure column and Sephadex LH-20 purification and liquid-phase separation are adopted sequentially for preparation, and the compound is structurally determined to be a new alkaloid compound with UV, IR, HR-ESI-TOF-MS, <1>H-NMR, <13>C-NMR and two-dimensional magnetic resonance ectroscopy analysis methods. The compound has potential anti-inflammation and anti-tumor effects and other activity, and the new compound and salts or derivatives of the new compound can be taken as a raw material for primer synthesis from other compounds, new drug development and pharmacological activity research, and the primer and theoretical basis are provided for development of new drugs and new components.

The invention relates to the field of extraction and separation of traditional Chinese medicines, and in particular relates to a novel alkaloid compound extracted, separated and identified from purslane herb and an extraction and separation method thereof. The molecular formula of the novel alkaloid compound is C18H17NO4, and the name is oleraciamide D. The invention further provides the extraction and separation method for the novel alkaloid compound, which sequentially adopts water decoction for extraction, extraction in ethyl acetate, silica gel column chromatography, ODS (octadecylsilyl) medium-pressure column, purification by Sephadex LH-20 and liquid phase separation for preparation. The structure is determined as a novel alkaloid compound by adopting UV (ultraviolet), <1>H, NMR (nuclear magnetic resonance), <13>C NMR and two-dimensional NMR spectrum analysis methods. The compound has potential anti-inflammatory and neuroprotection activity and the like, moreover, the preparation method is provided, and a primer and a theoretical basis are provided for the development of new medicines and new ingredients.

The invention relates to the field of extraction and separation of traditional Chinese medicines, particularly to a novel compound extracted, separated and identified from a portulaca oleracea medicinal material and an extraction and separation method and more particularly to a compound Oleracone D in portulaca oleracea and an extraction and separation method of the compound Oleracone D. The molecular formula of the novel compound is C17H14O5. Researches find that the novel compound has anti-inflammatory and anti-oxidation functions. Meanwhile, the extraction and separation method which is convenient, rapid, environmentally friendly and high in purity and used for the novel compound is provided.

The invention especially relates to identified alkaloid compounds with novel skeletons extracted and separated from purslane and an extraction and separation method thereof, belonging to the field of extraction and separation of traditional Chinese medicines. The alkaloid compounds with novel skeletons have molecular formulas of C18H26N2O, C18H24N2O2 and C18H28N2O2, respectively, and are named as oleracimine, oleracimine A and oleracone A, respectively. The invention also provides an extraction and separation method for the novel components. The extraction and separation method successively carries out extraction through water decoction, ethyl acetate extraction and column chromatography on silica gel, an ODS medium-pressure column and Sephadex LH-20 so as to successfully extract and separate the novel alkaloid compounds with unique skeletons. The novel alkaloid compounds have anti-inflammatory, pain-easing and antineoplastic effect. The compounds and salts or derivatives thereof can be used as lead compounds for synthesis of other compounds and as raw materials for development of novel drugs and research on pharmacological activity, and are applicable to preparation of anti-inflammatory, pain-easing and antineoplastic drugs or health products.

The invention discloses a flexible fabric-based strain sensor and a preparation method thereof, and belongs to the technical field of sensors. The preparation method comprises the following steps of (1) pretreating an elastic fabric; (2) modifying the pretreated elastic fabric by using dopamine or a derivative thereof; (3) dipping the elastic fabric modified by dopamine or the derivative thereof in a dispersion liquid of graphene or the derivative thereof, drying, reducing, washing and drying; and (4) dipping the elastic fabric obtained in the step (3) in a mixed dispersion liquid of silver nitrate and carbon nanotubes or derivatives thereof, drying, reducing, washing, and drying to obtain the flexible fabric-based strain sensor. Due to the addition of dopamine or the derivative thereof, the problems that a carbon material is poor in dispersity and easy to agglomerate are solved, the bonding firmness problem of a conductive material and a matrix in the sensor is solved, and meanwhile the problems of low sensitivity, wide strain and the like of an existing flexible strain sensor are solved.

The invention relates to the traditional Chinese medicine extracting and separating field, and particularly relates to a new compound extracted, separated and identified from the compound Oleracone Ein herba portulacae and its extracting and separating method, especially relates to the compound Oleracone E in herba portulacae and its extracting and separating method. The molecular formula of thecompound is C17H1805. The study finds that the new compound has the anti-inflammatory and anti-oxidizing effects; meanwhile, the invention provides a simple, rapid, environment-friendly, and high-purity extracting and separating method specific to the new compound.

The invention relates to the field of extraction and separation of traditional Chinese medicine, in particular to a pyrrole dicarboxylic acid compound extracted, separated and identified from herba portulacae and an extraction and separation method thereof. The molecular formula of the pyrrole dicarboxylic acid compound is C7H8N2O5, and the pyrrole dicarboxylic acid compound is named as 3-(carboxy(methoxy)amino)-1H-pyrrole-2-carboxylic acid. The extraction and separation method of the pyrrole dicarboxylic acid compound is further provided. The compound is prepared by sequentially adopting water for decoction extraction, ethyl acetate for extraction, a silica gel column for chromatography, an ODS medium pressure column and Sephadex LH-20 for purification and a liquid phase for separation. The novel pyrrole dicarboxylic acid compound is structurally determined by means of an approach including 1H NMR, 13C NMR and two-dimensional NMR wave spectrum analysis. The compound has potential activity such as inflammation resistance and cholinesterase resistance, a preparation method is provided, and a leading compound and a theoretical basis are provided for development of new drugs and new components.

The invention relates to oleralignan in portulaca oleracea as well as an extraction and separation method and applications thereof, in particular relates to a new lignans compound extracted, separatedand identified from the portulaca oleracea as well as the extraction and separation method thereof. The molecular formula of the new compound is C18H16O4, and the new compound is named as oleralignan. The invention further provides the extraction and separation method of the new compound, which is adopted for successfully extracting and separating the new lignans compound by performing the following steps in turn: extraction by boiling with water, silica gel column chromatography, polyamide column chromatography, ODS medium pressure column chromatography and Sephadex LH-20 separation. The structure of the oleralignan is identified to be the new lignans compound by the method of analyzing mass spectroscopy, carbon spectroscopy, hydrogen spectroscopy and two-dimensional nuclear magnetic resonance spectroscopy, and the new lignans compound has anti-tumor and antioxidant effects. The new compound provided by the invention as well as the salts or derivatives thereof can be taken as primersfor synthesizing other compounds and raw materials for developing new medicines and studying pharmacological activity.

The invention discloses a method for fermentation production of adenine. The method comprises the steps of fermentation cultivation, crude product extraction and fine product extraction in sequence, specifically, fermentation cultivation comprises the steps that adenine seeds are inoculated onto a culture medium, and after fermentation, an adenine fermentation broth containing the adenine is obtained; crude product extraction comprises the steps that the adenine fermentation broth is subjected to the steps of fermentation broth inactivation, solid-liquid separation, filtrate concentration, adsorption elution, eluent concentration, temperature-decreasing crystallization, and an adenine crude product is obtained; and fine product extraction comprises the steps that the adenine crude productis added with purified water to be dissolved and put into activated carbon for decolorization, and crystallization and drying are performed to obtain an adenine fine product. According to the method,raw materials are wide in source, the production cost is low, a process technology is mature, environmental protection is achieved, the product purity is high, and the method is suitable for industrial production.

Provided is a method for preparing cortisone acetate in one pot. According to the method, Anecortave acetate is adopted as a raw material, and after the raw material is added into an organic solvent,a pot is adopted for preparation. The method comprises the following steps of A, adding a compound I into a mixed organic solvent and adding a halogenating reagent and an acid catalyst, wherein the reaction temperature is controlled in a range from -10 DEG C to 30 DEG C; after the reaction is finished, adding a quencher to quench the reaction, wherein the quencher comprises a sodium sulfite solution or a sodium bisulfite solution; B, adding an oxidant into a system finally obtained in step A, wherein the oxidant is a Jones reagent or pyridine chlorochromate or a Dess-Martin oxidant used for anoxidization reaction, and the reaction temperature is controlled in a range from -10 DEG C to 30 DEG C; after the reaction is finished, adding the quencher to quench the reaction; C, adding an organic acid catalyst and a reducing agent into an organic layer finally obtained in step B to obtain a target product cortisone acetate IV. The preparation method greatly reduces the discharge amount of waste liquid.

The invention relates to the field of traditional Chinese medicine extraction and separation, in particular to a new compound extracted, separated and identified from purslane and an extraction and separation method thereof. The molecular formula of the novel compound is C15H13NO5, and the novel compound is named as portulacatone A. The invention also provides an extraction and separation method of the new compound, and the new alkaloid compound is successfully extracted and separated by sequentially adopting alcohol extraction, silica gel column chromatography, polyamide column chromatography, ODS medium-pressure column and Sephadex LH-20 separation preparation. The structure of the alkaloid compound is identified as a new alkaloid compound by a mass spectrum, carbon spectrum, hydrogen spectrum and two-dimensional nuclear magnetic spectrum analysis method. The new compound has potential anti-inflammatory activity and the like, a preparation method is provided, and a primer and a theoretical basis are provided for developing new drugs.

The invention relates to the field of traditional Chinese medicine extraction and separation, in particular to a new compound extracted, separated and identified from herba portulacae medicinal material as well as an extraction and separation method and application thereof. The invention provides a compound Olerafuran A extracted from herba portulacae as well as an extraction and separation methodand application of the compound Olerafuran A. The ester compound is prepared by sequentially adopting alcohol decoction extraction, silica gel column chromatography, polyamide column chromatography,ODS medium-pressure column and Sephadex LH-20 purification and liquid phase separation, the extraction and separation method is simple, convenient, rapid and environment-friendly, and the compound separated by the method is relatively high in purity. Pharmacological experiments prove that the obtained compound has anti-tumor and anti-cholinesterase effects, so that the compound Olerafuran A extracted from herba portulacae as well as a salt and a derivative thereof can be used as natural products to develop new traditional Chinese medicine and have a wide medical application prospect.

The invention relates to the field of extraction and separation of traditional Chinese medicines, in particular to a new compound extracted, separated and identified from a portulaca oleracea medicinal material, an extraction and separation method and application thereof, and particularly relates to an extraction and separation method and application of a furan ring compound in portulaca oleracea.The extraction and separation method of the new compound sequentially adopts ethanol extraction, silica gel column chromatography, polyamide column chromatography, macroporous resin column chromatography, ODS medium-pressure column and Sephadex LH-20 purification, and liquid phase separation for preparation. The structure of the compound is determined as a new furan ring compound by adopting UHPLC-ESI-TOF-MS, <1>H-NMR, <13>C-NMR and two-dimensional nuclear magnetic spectrum analysis method. The compound has potential anti-inflammatory and neuroprotective effects and other activities, the newcompound and salts or derivatives thereof can be used as other compound synthesis primers and raw materials for new drug development and pharmacological activity research, and the primer and theoretical basis are provided for new drug development and new component development.

The invention provides a process for manufacturing a plate by recycling waste polypropylene. The process comprises the following steps of: 1, preprocessing plant fibers, namely modifying the plant fibers by using alkaline; 2, recycling polypropylene from waste plastics, namely grinding the polypropylene of the waste plastics into fine particles, pelleting the fine particles by virtue of an extruding machine; 3, proportioning the recycled polypropylene particles with new polypropylene material and the recycled plant fibers, fully mixing and spreading; and 4, directly heating the spread raw materials, applying a certain pressure for pressing, maintaining the pressure for certain time, fully cooling, and demoulding to obtain the required composite plate. According to the process provided by the invention, the waste polypropylene is effectively recycled, the plant fibers are recycled, and the strength of the plate is enhanced; and the process is environmentally-friendly. The plate can be widely applied, and is especially suitable for manufacturing a plastic pass box, a folding box and an anti-static box.

The invention discloses an alkaloid compound extracted from orychophragmus violaceus seeds and an extraction method and application of the alkaloid compound. The alkaloid compound is extracted from orychophragmus violaceus seeds, and the chemical structural formula of the alkaloid compound is shown as a formula (1). The alkaloid compound provided by the invention has a good liver protection effect, can be used as a synthetic primer of other compounds and a raw material for new drug development and pharmacological activity research, and can also be used for preparing liver protection drugs. Inaddition, the extraction method is simple, convenient and rapid, the process method is environment-friendly, and the purity is greater than 98%.

The invention discloses a preparation method of a TiO2 / Ni2P heterojunction visible-light photocatalyst with defects, and belongs to the technical field of preparation and application of nano materials. The preparation method comprises the following steps: firstly, doping Ni < 2 + > into semiconductor TiO2 for artificial introduction of surface oxygen defects, carrying out solid phase thermal reduction to realize reduction precipitation of a part of Ni < 2 + > in crystal lattices, and loading on the surface of TiO2; carrying out phosphating treatment to form the TiO2 / Ni2P heterojunction visible-light photocatalyst with defects. Because of Ni doping and introduction of surface oxygen defects, TiO2 band gap is narrowed, the light absorption range is expanded to a visible light region. The H2yield in unit time is used for evaluating the catalytic performance of the catalyst. The method is simple, environment-friendly and high in catalytic efficiency; the catalyst has potential applicationvalue in the aspect of hydrogen production through visible light catalytic water decomposition.

The invention relates to the field of traditional Chinese medicine extraction and separation, in particular relates to a new flavonoid compound extracted, separated and identified from purslane and anextraction separation method and application thereof, and in particular relates to Oleracone H in purslane and an extraction separation method and application thereof. The molecular formula of the new compound is C13H14O6 and is named as Oleracone H. The extraction and separation method of the new compound sequentially comprises water decoction extraction, silica gel column chromatography, polyamide column chromatography, ODS medium pressure column and Sephadex LH-20 separation, and the new flavonoid compound is successfully extracted and separated, and is structurally identified as a new flavonoid compound by mass spectrometry, carbon spectrometry, hydrogen spectrometry and two-dimensional nuclear magnetic spectrum analysis methods. Studies show that the novel compound has anti-tumor andanti-oxidation effects, and the novel compound and salts or derivatives thereof can be used as precursor compounds for synthesizing other compounds, as well as raw materials for new drug developmentand pharmacological activity research, and can be used for preparing anti-tumor and anti-oxidation drugs.

The invention relates to the fields of extraction and separation of traditional Chinese medicines, in particular to a new compound which is extracted, separated out and identified from a medicine-parslane herb, and an extraction and separation method and application of the new compound; the invention in particular provides a peroxy bond-containing compound Oleracone I in the parslane herb as wellas an extraction and separation method and application of the compound. The extraction and separation method of the new compound sequentially adopts water decoction extraction, silica gel column chromatography, polyamide column chromatography, an ODS medium pressure column and Sephadex LH-20, thus successfully extracting and separating the new peroxy bond-containing compound. The structure of thecompound is identified as the new peroxy bond-containing compound by means of mass spectrometry, carbon spectroscopy, hydrogen spectroscopy and two-dimensional magnetic resonance ectroscopy analysis.The new compound has anti-tumor and anti-inflammatory effects, and the new compound and salts or derivatives thereof can be used as primers for synthesizing other compounds, and also can be used as raw materials for new medicine development and pharmacological activity research, thus being used for the preparation of anti-tumor and anti-inflammatory medicines.

The invention relates to a method for preparing oxamide from dimethyl oxalate, which comprises the following steps: (1) mixing a dimethyl oxalate material flow, a methanol raw material flow and a liquid ammonia material flow, and carrying out ammonolysis reaction to provide an ammonolysis product material flow; (2) performing solid-liquid separation on the ammonolysis product material flow to provide a first liquid-phase material flow and a first solid-phase material flow; (3) rectifying the first liquid-phase material flow to provide a first ammonia gas material flow and a methanol crude product material flow; condensing the first ammonia material flow to provide a first liquid ammonia recovery material flow, the first liquid ammonia recovery material flow usable for an ammonolysis reaction; refining the methanol crude product material flow to provide a methanol product material flow; (4) drying the first solid-phase material flow to provide an oxamide product and a first gas-phase material flow, and (5) performing condensation and gas-liquid separation on the first gas-phase material flow to provide a second ammonia gas material flow and a methanol recovery material flow. The method is a continuous oxamide synthesis process, methanol and ammonia can be recycled, and the method is energy-saving and environment-friendly.

The invention discloses a preparation method of a nitrogen-doped modified zinc oxide visible-light photocatalyst, and belongs to the technical field of preparation and applications of nano materials.According to the method, non-metallic element nitrogen is doped into a zinc oxide semiconductor, so that the surface defects of the zinc oxide semiconductor can be artificially introduced; and the nitrogen doping and the generation of the surface defects can effectively reduce the band gap of the zinc oxide semiconductor, and expand the spectral response of the zinc oxide semiconductor to a visible light region, so that the utilization rate of the zinc oxide semiconductor to visible light is improved. According to the invention, hexamethylenetetramine used in the method has two effects that the hexamethylenetetramine is a morphology control agent, and is further a nitrogen source required for preparing the nitrogen-doped modified zinc oxide, so that the method is simple, environment-friendly and high in catalytic efficiency; and the photocatalytic dye degradation performance of the catalyst is evaluated by adopting the ratio of the methyl orange concentration reduction value to the initial concentration in unit time, and the nitrogen-doped modified zinc oxide visible-light photocatalyst has potential application value in the aspect of dye degradation under the visible-light condition.

The invention relates to the field of traditional Chinese medicine extraction and separation, in particular to three alkaloid compounds extracted, separated and identified from purslane and an extraction and separation method thereof. The molecular formulas of the three alkaloid compounds are respectively C16H15NO5, C13H11NO3 and C14H13NO3, and the three alkaloid compounds are respectively named as 4,9,10-trihydroxy-2-methoxy-6,7-dihydrodibenzo [b,e]azocin-12(5H)-one, 9,10-dihydroxy-5,6-dihydro-11H-benzo[d]pyrrolo[1,2-a]azepin-11-one, and 8,9-dihydroxy-6,11-dihydro-5H-benzo[d] pyrrolo[1,2-a]azepine-3-carbaldehyde. The invention further provides an extraction and separation method of the alkaloid compounds. The extraction and separation method sequentially comprises the steps of ethanol reflux extraction, silica gel column chromatography, ODS medium-pressure column and hydroxypropyl dextran column chromatography purification and HPLC separation and preparation. The structures of the novel alkaloid compounds are determined by adopting methods of 1H-NMR, 13C-NMR and UHPLC-ESI-TOF-MS. The three compounds have potential anti-inflammatory and anti-cholinesterase activities and the like, a preparation method is provided, and a primer and a theoretical basis are provided for developing new drugs and new components.

The invention relates to the field of traditional Chinese medicine extraction and separation, in particular to a new compound extracted, separated and identified from a purslane medicinal material andan extraction and separation method and application thereof. The invention provides a lignan compound olealignan A extracted from portulaca oleracea and an extraction and separation method and application thereof. The ester compound is prepared by sequentially adopting alcohol decoction extraction, silica gel column chromatography, polyamide column chromatography, ODS medium-pressure column and Sephadex LH-20 purification and liquid phase separation. The extraction and separation method is simple, convenient, quick and environment-friendly, and the compound separated by the method is relatively high in purity and pharmacological experiments prove that the obtained compound has anti-tumor and anti-cholinesterase effects so that the lignan compound olealignan A extracted from purslane and the salt and derivative thereof can be used as natural products to develop new traditional Chinese medicine, and have a wide medical application prospect.

The invention relates to the fields of extraction and separation of Chinese traditional medicines and in particular relates to two novel flavonoid compounds extracted, separated and identified from purslane as well as an extraction and separation method of the two flavonoid compounds. Molecular formulae of the two novel flavonoid compounds are respectively C18H16O5 named 3-(2-hydroxybenzyl)-6,8-dimethoxy-4H-chromen-4-one and C18H18O5 named 3-(2-hydroxybenzyl)-6,8-dimethoxychroman-4-one. The invention further provides the extraction and separation method of the novel compounds, and separation,purification and preparation are performed by sequentially adopting decoction extraction, silica column chromatography, polyamide column chromatography, ODS medium-pressure column purification, Sephadex LH-20 and recrystallization. The novel compounds adopt the structures of HR-ESI-TOF-MS, 1H-NMR and 13C-NMR and are authenticated as two novel flavonoid compounds by adopting a two-dimensional nuclear magnetism spectrum method. The novel flavonoid compounds have potential anti-inflammatory, anti-tumor and anti-oxidation activities, and the novel flavonoid compounds and salts or derivatives thereof can be used as primers for synthesizing other compounds and raw materials for novel drug development and pharmacological activity research to prepare anti-inflammatory, anti-tumor and anti-oxidation drugs or health care products.

The invention belongs to the technical field of industrial sewage treatment, and relates to a treatment device and a treatment method for recycling ardealite leachate. The treatment device for recycling ardealite leachate comprises a water collecting tank, a self-control dosing system, a mixing and settling system, a clean water tank and a product discharge system. A water inlet communicated with the water collecting tank is formed in the water collecting tank; the water collecting tank is communicated with the clean water tank through the mixing and settling system; the clean water tank is connected into the mixing and settling system; a water outlet communicated with the clean water tank is formed in the clean water tank; and the self-control dosing system and the product discharge system are respectively communicated with the mixing and settling system. According to the treatment device and the treatment method for recycling ardealite leachate, N, P and F elements are separately precipitated and separated out, no solid waste is generated, and the purpose of resource recycling can be achieved.

The invention relates to a method for preparing polyimide by performing polymerization reaction in supercritical carbon dioxide, belongs to the technical field of synthesis of polyimide polymer, and solves the technical problems that an organic solvent is needed and subsequent treatment difficulty is high in the synthesis reaction process of the polyimide in the prior art. According to the method, the polyimide is synthesized by taking acid anhydride or aniline as a blocking agent and the supercritical carbon dioxide as a medium. The method comprises the following steps of: adding dianhydride, a diamine monomer, a catalyst and the blocking agent into a reaction kettle at one time or in batches, introducing carbon dioxide, and gradually raising temperature and pressure to ensure that a system is in a supercritical state; and polymerizing at certain temperature and pressure to obtain a polyimide product with a good shape and high performance. The organic solvent is not used, the product is pure, subsequent treatment is not needed, the reaction medium is non-toxic and pollution-free, and the method is an economic, practical and environment-friendly process method for synthesizing and preparing the polyimide.