203results about How to "Change molecular structure" patented technology

The invention relates to a preparation method for a chitosan natural polymer modified crude oil desalting demulsifier. The method comprises the following steps: 1) modifying polyethylene glycol monomethyl ether by halogenating; 2) preparing glycidyl dimethyl alkyl ammonium chloride; 3) preparing quaternized carboxy alkyl chitosan; 4) causing the modified polyethylene glycol monomethyl ether to react with the quaternized carboxy alkyl chitosan, thereby obtaining a target product, polyethylene glycol monomethyl ether grafted quaternized carboxy alkyl chitosan. According to the invention, the chitosan natural high-molecular compound is taken as the raw material and has the advantages of wide resource, naturality, non-toxicity, sustainability, excellent biological compatibility of products, degradability, and the like. The demulsifier prepared according to the invention has excellent demulsification dewatering effect; the molecule of the demulsifier contains a large amount of carboxy alkyl groups and quaternary ammonium salt groups and the electronegative ions, including metal cation, naphthene acid radicals, and surfaces are electronegative grains and have strong combining capacity, so that the demulsifier has the capacities of demulsifying while removing oil-soluble salt.

The invention relates to a preparation method of a polyether-grafted chitosan derivative crude oil desalting demulsifier. The preparation method comprises the following specific steps: firstly, performing formylation modification on polyethylene glycol monoethylether; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternarization carboxyalkyl chitosan; fourthly, enabling formylation modified polyethylene glycol monoethylether to react with carboxy alkyl chitosan to obtain the polyether-grafted chitosan derivative crude oil desalting demulsifier. The polyether-grafted chitosan derivative crude oil desalting demulsifier disclosed by the invention is prepared by taking chitosannatural polymeric compounds as raw materials, and has the advantages of wide sources, naturalness, no toxicity, sustainability, good biocompatibility of a product, degradability and the like. The prepared demulsifier is good in demulsifying and dehydrating effect; meanwhile, a demulsifying molecule contains a large amount of carboxyalkyl groups and quaternary ammonium salt groups which have strong combining capacity to metal cation, ions with negative electricity such as naphthenic acid radicals as well as particles of which the surfaces are electronegative, so the polyether-grafted chitosan derivative crude oil desalting demulsifier has capacity of removing oil-soluble salts while demulsifying.

The invention relates to a synthesis method of a crude oil desalting demulsifying agent. The method specifically includes the steps of firstly, conducting p-nitrophenyl ester modification on methoxypolyethylene glycol; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternized carboxy alkyl chitosan; fourthly, making the modified methoxypolyethylene glycol react with quaternized carboxy alkyl chitosan to obtain a product, namely polyethylene glycol questin grafted quaternized carboxy alkyl chitosan. A chitosan type natural high-molecular compound serves as the raw material and has the advantages of being wide in resource, natural, free of toxin, sustainable, good in product biocompatibility, degradable and the like; The prepared demulsifying agent is good in demulsifying dewatering effect; meanwhile, due to the fact that lots of carboxy alkyl groups and quaternary ammonium salt groups are contained in demulsifying agent molecules and have strong binding capacity with metal cations, naphthenic acid radicals and other ions with negative charges and particles with surface electronegativity, the oil-soluble salt removing capacity is achieved during demulsifying.

The invention relates to a preparation method of a chitosan type crude oil desalting demulsifier. The preparation method includes the steps of firstly, performing epoxidation modification on methoxy polyethylene glycol; secondly, preparing glycidyl dimethyl alkyl ammonium chloride; thirdly, preparing quaternization carboxy alkyl chitosan; fourthly, allowing the modified methoxy polyethylene glycol to react with the quaternization carboxyl alkyl chitosan to obtain methoxy polyethylene glycol grafted quaternization carboxy alkyl chitosan. The preparation method has the advantages that chitosan type natural high-molecular compounds are used as the raw materials, the method is wide is source, natural, nontoxic and sustainable, and the product of the method is good in biocompatibility, degradable, and the like; the prepared demulsifier is good in demulsifying and dewatering effect, the demulsifier has high combining capacity to electronegative ions such as metal cations and naphthene acid radicals and electronegative particles due to the fact that the molecules of the demulsifier contain a large amount of carboxyl alkyl groups and quaternary ammonium salt groups, and oil-soluble salt can also be removed during demulsifying.

This invention is related to a process of disposing urban sewage, which comprise the steps of coagulate filtration, ozone oxidation, biological oxidation to dispose urban sewage, so that the residual undegradable organic substances, bacteria and virus in the second-class urban sewage can be removed and the water can be recycled. According to different usages of the recycled water, the process also comprises reverse osmosis or nanoscale filtration treatment to further remove the residual organic and inorganic substances in the water. The process is a combination of coagulate filtration, ozone oxidation, biological oxidation and reverse osmosis, designed to resolve such problems as urban sewage disposal and water recovery. The process can obtain high-quality recycled water with a low cost, showing high cost performance, which is important to resolving urban water depletion, raising the utilization rate of water resources, reducing environmental pollution and promoting sustainable development of the society.

The invention relates to a high-performance angiogenesis inhibitor and a production method, which belongs to the field of the biological engineering pharmaceutical technology or protein polypeptide drugs. The invention designs a high-performance angiogenesis inhibitor RGD-ED with integrin compatibility, the inhibitor contains angiogenesis inhibition polypeptide isoleucine-valine-arginine-arginine-alanine-aspartate-arginine-alanine-alanine-valine-proline, and one or two ends of the inhibitor are respectively connected with polypeptides containing arginine-glycin-aspartate sequence. The RGD-ED of the invention can be synthesized. By the method of genetic engineering, the invention also expresses one of RGD-Eds in escherichia coli or other eukaryotic cells, and the RGD-ED is obtained by carrying out the separation, dissolution and renaturation of inclusion body protein and separation and purification by ion exchange chromatography. All the polypeptide sequences of the invention are modified by Polyethylene Glycol (PEG), heparin, dextran, polyvinylpyrrolidone (PVP), polyglycol-poly (amino acid) copolymer, palmitic acid, colominic acid and liposome, which includes liposome (REV), drying liposomal (DRV) and multivesicular liposome (Mvl). In vivo and in vitro experiments, the synthetic polypeptide sequence, product of genetic engineering and modified product of the invention can notably increase the effects of inhibiting the growth of endothelial cells, inhibiting angiogenesis and resisting tumor of the present angiogenesis inhibitors, and moreover, the high-performance angiogenesis inhibitor can be used as a drug curing solid tumors and rheumatoid arthritis.

The invention provides a reduction-sensitive-type water-soluble molecularly-targeted photosensitizer. The photosensitizer is a conjugate which is formed by sequentially connecting meso-tetrahydroxy phenyl chlorine (mTHPC) with a folic acid group through a carbonic ester bond, a disulfide bond and a PEG chain. The invention further provides a chlorine intermediate and a folic acid PEG cysteine amide intermediate which are used for preparing the photosensitizer and a preparation method of the targeted photosensitizer. According to the photosensitizer which has the good tumor targeting performance, the photodynamic activity and water solubility, by introducing the disulfide bond and the carbonic ester bond into the molecular structure, the targeted photosensitizer can generate an exchange reaction of a sulfydryl and the disulfide bond and a nucleophilic substitution reaction in molecules in a strong reducing environment of a tumor cell after entering the cell, therefore, the mTHPC is completely released, and it is guaranteed that the photodynamic activity of the mTHPC cannot be reduced due to the structural change.

The present invention discloses one kind of completely biodegradable hydrophobic material and its preparation process. The starch-base biodegradable material is prepared through reaction and extrusion in extruder of the following material: starch, PVA, lactone polymer capable of reacting with hydroxy group, biodegradable polymer, initiator and other assistant. The present invention has the advantages of low cost, high hydrophobicity of the product, simple operation, complete biodegradation of the material to eliminate 'white pollution', etc. The present invention is suitable for continuous production.

The invention discloses a continuous method for preparing hydrophilic copolyester slices and the hydrophilic copolyester slices prepared by the preparation method. The preparation method of the hydrophilic copolyester slices prepared by the continuous method comprises the following steps: continuously and uniformly adding pure terephthalic acid, ethylene glycol, benzene dibasic acid binary alcohol ester-5-sodium sulfonate, polydibasic alcohol, other dibasic alcohols, a delustering agent and the like into a beating kettle in proportion, performing esterification, prepolycondensation and polycondensation reactions, discharging, pelletizing and drying to get the hydrophilic copolyester slices. A continuous polymerization device is adopted for synthesis; and in the prepared hydrophilic copolyester slices, the molecular structure of polyester is changed by adding hydroxyl-containing components and inorganic powder into copolyester slices, thus the hydrophilic property is good. The preparation method is simple, the manufacturing process has no special requirements on the polymerization device, and the hydrophilic copolyester slices can be produced on existing domestic or imported equipment, so that the production cost is slow and industrial production is easy to realize.

The invention relates to a preparation method of dialdehyde carboxymethyl chitosan and belongs to the technical field of chitosan preparation. Through dissolution, oxidation reaction, standing, aftertreatment and drying, the dialdehyde carboxymethyl chitosan is prepared. Compared with the existing p-carboxymethyl chitosan modification research technology, the preparation method utilizes periodic acid and its sodium salt as oxidizing agents, under strong selective oxidation effects of the oxidizing agents, carboxymethyl chitosan is oxidation-modified by opening of a pyranoid ring on a molecular chain and then generation of the novel dialdehyde group so that a relatively-high molecular weight oxidation product can be obtained, the oxidation product molecular structure can be changed, reaction activity can be improved and molecular chain rigidity can be reduced. The preparation method has important effects of improving carboxymethyl chitosan polymer crystallinity, molecular chain flexibility and gel performances.

The invention relates to a method for degrading landscaping garbage to produce an organic fertilizer by utilizing high-efficiency mixed bacteria, which comprises the steps: (1) organic matters of the landscaping garbage are sterilized after being crushed; (2) nutrition substrates, lignin and cellulose degradation bacteria are added to the solid phase; (3) the mixture is irradiated for 20 minutes every other 8 hours by adopting low-frequency ultrasonic wave until the fourth to seventh day of the fermentation cultivation after the fermentation cultivation for 24 to 26h; and (4) the sterilization processing is carried out to obtain the finished product organic fertilizer after the thoroughly decomposition for 1 to 3 days. The method has the advantages of simple required equipment, simple andconvenient process, and safety disposal realization of the landscaping garbage. Meanwhile, the method produces the organic fertilizer capable of promoting the growth of crops, solves the difficultiesof difficult degradation and difficult recycle of the current landscaping garbage, and has extremely profound social significance and economic value.

The invention provides electrochemical-membrane separation water-treatment plant and a treatment method thereof. The plant comprises a reaction tank, inside which a membrane module is arranged. The membrane in the membrane module is a conductive membrane. A positive plate is arranged parallel to the membrane module at one side of the membrane module. The membrane module, which is used as a negative plate, and the positive plate are connected with an external power source. The main body of the reaction tank is equipped with a water inlet and a water outlet. An outlet of the membrane module is connected with the water outlet on the main body of the reaction tank. By combining electrochemistry and membrane separation process, polluted water is pretreated by electrooxidation or electric flocculation to form a pollutant filter cake layer, and the membrane module having the conductive membrane is used as the cathode to degrade the pollutant. Thus, membrane pollution is alleviated and the membrane cleaning effect is also achieved, the service cycle of the membrane is prolonged, and service life of the membrane is prolonged. Meanwhile, separation efficiency of pollutants in water is enhanced, and the water quality of effluent is improved.

The invention discloses a device for treating dirt materials of printing and dyeing wastewater. The device comprises a grid treatment tank, a filtering tank, an aeration treatment tank, a pool, an ejector, an ozone generator, a releaser, a water pump A, a water pump B and a water pump C, wherein a grid net is arranged inside the grid treatment tank; a water inlet tube is arranged on the left side of the grid net; a first water tube is arranged on the right side of the grid net; the first water tube is communicated with the filtering tank; the water pump A is arranged on the first water tube; a plurality of baffle plates are arranged from left to right in a staggered manner on the inner walls of two sides of the filtering tank; an activated carbon filtering net A is arranged at one end close to one inner wall of the filtering tank, of each baffle; the activated carbon filtering nets A prop against adjacent baffle plates and the inner walls of the filtering tank; and one side far away from the grid treatment tank, of the filtering tank, is communicated with the left side of the aeration treatment tank through a second water tube. By adopting the device, the activated carbon filtering nets can be highly utilized, and macromolecular organisms can be oxidized by ozone and ultraviolet light.

The invention discloses a preparation method of a potassium persulfate microcapsule gel breaker. The method includes: (1) preparing a 5-20 mass% gelatin solution; (2) under 45DEG C constant temperature and constant speed stirring, measuring liquid paraffin into a three-mouth flask, adding a stabilizer, and mixing the substances evenly into a continuous phase medium; (3) weighing potassium persulfate powder and slowly adding it into the continuous phase medium, conducting 45DEG C constant temperature water bath stirring to disperse the substances evenly so as to form a stable suspension system; (4) slowly adding the gelatin solution into the suspension system, conducting 45DEG C constant temperature stirring at a uniform speed to form a stable latex solution; (5) transferring the latex solution into ice bath to performing constant speed stirring, adding a dehydrating agent isopropanol and a crosslinking agent formaldehyde; and (6) removing the upper oil phase, and subjecting the lower solid microcapsule to washing, pumping filtration and drying. The method provided by the invention has reliable principle and is easy to operate, the prepared microcapsule gel breaker has good sphericity, uniform and controllable particle size distribution, high effective content, and slow-release property, can be used for gel breaking of oil field water-based fracturing fluid, and has broad market prospect.

The invention relates to the technical field of maize powder processing, in particular to a strengthening maize powder and a preparation method of the strengthening maize powder. The strengthening maize powder is prepared by taking modified maize powder as a main material and vital gluten, sodium alginate and xanthan gum as auxiliary materials, and processing the main material and the auxiliary materials by the following steps of: (1) cleaning; (2) soaking; (3) grinding; (4) micronizing; (5) carrying out press-filtering and drying; (6) pre-preparing the auxiliary materials; (7) mixing; and (8) metering and packaging. Strength of the maize powder is enhanced through addition of a physical chemical modification process and a food modifying agent as an auxiliary agent in the conventional preparation method of the maize powder; the strengthening maize powder can be directly used for processing foods such as breads, biscuits, and steamed buns and can also be added as the auxiliary materials; the prepared strengthened maize powder not only keeps the original nutrition and flavor of maize, but also is fine and smooth in a mouth feelingh, as well as has good processing performance.

The invention belongs to making and application of nutritional additives, and particularly discloses a whole-grain composite additive, preparation thereof and an application thereof to whole-grain flour preparing. An effective quantity of raw materials such as bran, corn, sticky rice, glutinous millet, black rice, black soya beans, fragrant rice, soybeans, oat, barley, red beans, peas, millet, buckwheat, green beans, peanuts, broomcorn and pearl barley are made into the whole-grain composite additive through sorting, screening, puffing, frying and smashing, and the whole-grain composite additive is used for preparing the whole-grain flour. By means of the whole-grain composite additive, the technical problems that in the prior art, a product nutritional structure is incomprehensive, mouthfeel is rough, and digestion is difficult are solved. The whole-grain composite additive has the advantages of being comprehensive in nutrition, fine and smooth in mouthfeel, easy to digest, high in gluten index, suitable for being made into multiple kinds of cooked wheaten food and the like.

The invention discloses a polyhydroxy alkanoates graft polymer and a preparation method thereof; the polyhydroxy alkanoates graft polymer is prepared by the following ingredients by weight parts: 100 parts of polyhydroxy alkanoates, 01-15 parts of grafting monomer, 0-5 parts of initiator and 0-5 parts of antioxidants. The polyhydroxy alkanoates graft polymer changes the molecular structure of thepolyhydroxy alkanoates, improves the heat stability thereof and further quickens the biological degrading ratio; in addition, the compatibility of the polyhydroxy alkanoates graft polymer and inorganic filling materials, such as CaCO3, talcum powder and the like and the polarity blending material is improved, and the polyhydroxy alkanoates graft polymer has high practical and economical values.

The invention relates to an oil enhancement device of an oil field, which comprises a ground system, a data acquisition system and an underground system.According to the device, a resonance effect is formed since the resonant frequency of an ultrasonic generator is identical with the frequency of load liquid, the permeability and crude oil flowability of a reservoir are improved, and the crude output and therecovery ratio are effectively increased.The technology has no harm to an oil well and a water well, is free from environmental pollution and is a green and environment-friendly physical oil recovery method, and at the same time, the device is convenient and quick to operate and low in cost, and has significant economic and social benefits.

The invention discloses a production method for dried mutton. The production method comprises four steps of selecting and preprocessing a raw material, salting the raw material, curing and cutting, and drying by hot wind and microwave. Compared with the conventional drying method for producing dried mutton, a hot wind and microwave combined drying technology is adopted, so that the shortage of a single drying technology can be overcome, the advantages of hot wind drying and microwave drying are given into full play, the production cycle is shortened, the energy consumption is reduced, and the quality of a dried mutton product is improved. By adopting a salting way of uniformly applying salting materials and stacking material layers and mutton layers, the contact areas of the salting materials and mutton cubes can be greatly increased, the material liquid permeation speed is increased, and the produced dried mutton is fragrant and delicious in taste, proper in softness and hardness, chewy, scented, unique and long in aftertaste.

The invention belongs to the technical field of preparation of modified starch embedding wall materials, and particularly relates to starch octenyl succinate as well as a preparation method and application thereof. The preparation method of the starch octenyl succinate comprises the following steps: (1) preparing starch octenyl succinate synthesized by starch and octenyl succinic anhydride under a wet process condition into 1%-15% of starch milk I and 25%-40% of starch milk II; (2) fully gelatinizing the starch milk I in boiling water bath, and then homogenizing under high pressure to prepare a starch paste solution I; (3) adding the starch milk II into the starch paste solution I, fully gelatinizing in boiling water bath, then homogenizing under high pressure, reducing the temperature to 45-55 DEG C, and adjusting the pH value of the starch paste solution to 5.5 to prepare a starch paste solution II; and (4) adding glucamylase into the starch paste solution II, carrying out enzymolysis, increasing the temperature and deactivating enzyme after the reaction is ended, freezing and drying, and pulverizing to obtain a finished product. When the starch octenyl succinate is used as an emulsification embedding wall material with high oil carrying capacity, the starch octenyl succinate has high oil carrying capacity; when the starch octenyl succinate is used for embedding 40% of oil substance, the maximum embedding rate can reach up to 98.51% maximally.

The invention relates to environment-friendly type modified coal asphalt and a preparation method thereof. The preparation method in the technical scheme comprises the following steps: placing 20-30 weight parts of coal asphalt into a reaction kettle with a reflux unit; then, under the conditions that temperature is 70 DEG C-90 DEG C and stirring speed is 80 r/minute-100r/minute, adding 67-77 weight parts of mixed solvent into the reaction kettle, stirring for 10 minutes, re-adding 2.6-3.2 weight parts of modifier and 0.20-0.32 weight parts of sulfuric acid under the condition that temperature and stirring speed are the same, and stirring for 1 hour-5 hours to obtain a coal asphalt mixture; and finally, under the condition with the temperature of 100 DEG C-110 DEG C, distilling the obtained coal asphalt mixture under reduced pressure to recycle solvent to prepare the environment-friendly type modified coal asphalt. According to the invention, process is simple, reaction temperature is low, dosage of the modifier is less, the solvent can be recycled, cost is low and content of polyaromatic hydrocarbon 3,4-benzopyrene in the coal asphalt can be effectively lowered.

The invention discloses a method for preparing heavy metal ion adsorbents from grafted modified cotton fibers. The method includes placing oxidized cotton fibers in tetraethylenepentamine solution, carrying out heating grafting reaction, sufficiently washing reaction products by water and then carrying out freeze-drying on the reaction products to obtain tetraethylenepentamine grafted modified cotton fibers; sequentially adding NaOH aqueous solution, absolute ethyl alcohol and epichlorohydrin into oxidized cotton fibers, carrying out heating grafting reaction in water bath, then washing reaction products by water until the reaction products are neutral, washing the reaction products by acetone and drying the reaction products to obtain epoxy cotton fibers; sequentially adding deionized water, Na2CO3 and diethylenetriamine into the obtained epoxy cotton fibers, carrying out grafting reaction under nitrogen protection conditions, washing reaction products by water until the reaction products are neutral, and drying the reaction products to obtain ion exchange fibers; uniformly mixing the ion exchange fibers and the obtained tetraethylenepentamine grafted modified cotton fibers with one another to obtain the heavy metal ion adsorbents.