1631 results about "Dichloroethane" patented technology

The invention refers to a process for the production of high-purity 1,2-dichloroethane from dissolved chlorine and dissolved ethylene, which are brought into contact with each other in a circulating liquid reaction fluid, which mainly consists of 1,2-dichlorethane and a catalyst and flows through at least one vertically arranged loop-type reaction section, both legs of the loop being connected to an overhead degassing vessel from where the reaction product is withdrawn either in gaseous or in liquid state or in both gaseous and liquid state, and numerous admixing sections being arranged in the leg of the loop in which the liquid rises, and each of these admixing sections having one upstream feed point for dissolved or gaseous ethylene and one downstream feed point for dissolved chlorine and, if required, the admixing sections featuring static mixers.

The invention relates to a method for producing high-purity 1,2-dichloroethane from dissolved chlorine and dissolved ethylene which are brought into contact with each other using a circulating liquid reaction medium which essentially consists of 1,2-dichloroethane and a catalyst and passes through at least one reaction loop. The two limbs of the loop are connected to a gas-phase stripping container which is arranged at the top and from which the reaction product is outwardly transferred either in a gaseous or liquid form or both in a gaseous form and in a liquid form. The addition points for the addition of chlorine and dissolved ethylene are arranged in the limb of the loop in which the liquid rises. The addition point for dissolved chlorine is always arranged downstream of the ethylene addition point. At least one addition point for liquid 1,2-dichloroethane follows each chlorine addition point, and the addition of the liquid 1,2-dichloroethane is carried out under kinetic energy which is high enough to enable a vigorous mixture of 1,2-dichloroethane, dissolved chlorine and ethylene to be carried out. Preferably, the liquid 1,2-dichloroethane is added by means of at least one jet mixer.

The invention discloses a method for preparing chloroethylene by catalytic reforming, which relates to a method for preparing the chloroethylene. The method comprises: a step of preparing a catalyst by using active carbon as a carrier, in which a barium salt is used as a catalyst, the active carbon is used as the catalyst carrier, and the barium salt is dissolved in water, absorbed by the active carbon and dried to obtain the catalyst carried by the active carbon; and a step of synthesizing the chloroethylene, in which acetylene gas and dichloroethane vapour are mixed and introduced to a reactor containing the catalyst carried by the active carbon to react, the reaction effluent is cooled to room temperature, unreacted dichloroethane is condensed to be separated out, and the remaining gas is compressed and frozen to give liquid chloroethylene. In the invention, a mercury free catalyst is adopted, the mercury pollution of the chloroethylene production industry is eliminated, and the reaction is performed spontaneously with little energy consumption.

The invention discloses a super high cross-linking adsorption resin with quaternary amines base composite function and making method, which comprises the following steps: utilizing phenylethene as monomer, diphenyl ethylene as cross linking agent, liquid wax as hole-sealing agent, magnesium carbonate as disperser, benzoyl peroxide as initiator; adopting nitrobenzene, substituted nitrobenzene, dichloroethanes or orthodichlorobenzene as swelling agent in the cross-linking reaction course of chloromethylation low cross-linking large-hole polyphenylacetylene; using zinc chloride, ferric chloride or tin tetrachloride as catalyst to produce different cross linking composite functional resin priority in the preset time and temperature condition; adding trimethylamine to aminate to produce the product. The resin possesses double functions of adsorption and ion exchanging, which can be applied in drug separation, little polluted water source and organic chemical waste water harnessing.

The invention belongs to the technical field of preparation of a regenerated cellulose material and discloses a preparation method of the regenerated cellulose material. A employed solvent is a carboxylic acid type ionic liquid or is a co-solvent which is composed of the carboxylic acid type ionic liquid and an active-proton-free polar organic solvent, wherein the carboxylic acid type ionic liquid is preferably selected from 1-ethyl-3-methylimidazole acetate, 1-propyl-3-methylimidazole acetate or 1-butyl-3- methylimidazole acetate; an auxiliary solvent is selected from one or more of DMF, DMAc, DMI, DMSO, pyrrodine, acetone, dichloromethane and dichloroethane; and a solidifying agent is preferably selected from alcohol organic solvents. The carboxylic acid type ionic liquid is most preferably selected from the 1-ethyl-3-methylimidazole acetate and the 1-butyl-3-methylimidazole acetate; the auxiliary solvent is most preferably DMF; and the solidifying agent is preferably ethanol; wherein a mass ration of the carboxylic acid type ionic liquid to the auxiliary solvent is 5:5. By means of the preparation method, mechanical performances of a regenerated cellulose product can be significantly improved and environmental pollution can be reduced.

The invention relates to a fireproof flame-retardant polyurethane external wall thermal-insulation system material, which is characterized by comprising a moistureproof primer paint, a flame-retardant rigid polyurethane foam material, an interface agent, anti-crack mortar, a fireproof coating and a decorating coating which are arranged sequentially from inside to outside, wherein the flame-retardant rigid polyurethane foam material consists of an component A and a component B; the component A is prepared by mixing 80 to 50 parts by weight of phosphorous flame-retardant polyether polyol, 20 to 50 parts by weight of heterocyclic amine polyether polyol, 2 parts by weight of organic silicon foam stabilizer, 2 parts by weight of dimethylethanolamine catalyst, 1 part by weight of dibutyltin dilaurate catalyst, 20 to 50 parts by weight of flame retardant and 20 to 40 parts by weight of fluoro dichloroethane; the component B is a flame-retardant polyisocyanates curing agent; in the using process, the component A and the component B are mixed and foamed and an isocyanate index is between 1.05 and 1.10. The fireproof flame-retardant polyurethane external wall thermal-insulation system material of the invention has the advantage of having higher fireproof flame-retardant property.

Process for the manufacture of 1,2-dichloroethane (DCE) starting from a stream of ethane which is subjected to a catalytic oxydehydrogenation (ODH) thus producing a gas mixture containing ethylene which is then dried and conveyed to a chlorination reactor supplied with a flow of chlorine so that at least 10% of the ethylene is converted to DCE. The stream of products derived from the chlorination reactor is then conveyed to an oxychlorination reactor in which the majority of the balance of ethylene is converted to DCE.

The invention relates to a method for preparing a graphene biosensor, belonging to the technical field of electrochemistry. The method comprises the following steps of: immersing a processed gold electrode into graphene oxide and a sodium sulphate solution, electrically depositing the electrode through a control electric potential, taking out the electrode, washing the electrode by using water, after drying the electrode at room temperature, putting the electrode in a chloroauric acid solution, electrically depositing the electrode through the control electric potential, taking out the electrode, washing the electrode by using water, and drying the electrode at room temperature; putting a modified electrode in a conductive polymer monomer and a supporting electrolyte solution, polymerizing the electrode through the control electric potential by adopting a cyclic voltammetry, taking out the electrode, washing the electrode by using water, and drying the electrode at room temperature; and activating the modified electrode in an EDC/NHS (Dichloroethane/N-Hydroxysuccinimide) solution, and immersing the modified electrode in a vomiting toxin antibody. The method disclosed by the invention is used for fixing graphene, gold nanoparticles and conducting polymers through electro-deposition; therefore, the method is very green and environment-friendly; furthermore, the thickness of a coating and sizes and distribution densities of the gold nanoparticles can be precisely controlled, thus, the batch production repeatability of the modified electrode is good.

The invention relates to a nitrogen-doped active carbon catalyst applied to preparation of vinyl chloride by catalytic cracking of 1,2-dichloroethane and in particular relates to active carbon, wherein the inner surface and the outer surface of the active carbon are doped with nitrogen; the doping content of nitrogen is 0.1-10wt%; furthermore, meal is loaded on the nitrogen-doped active carbon catalyst and exists in the form of a metal compound; the loading content of the metal compound is 0.1-10wt%. According to the catalyst, the preparation method is simple, the process is short, materials are easily available, and the cost is relatively low; the nitrogen doped in the active carbon has a small possibility of losing and inactivating; the nitrogen is doped in the nitrogen-doped active carbon catalyst loaded with the metal compound, so that the dispersion of the metal component on the active carbon can be effectively improved; the catalytic activity is improved; the cracking temperature of dichloroethane can be greatly reduced under the catalytic action of the catalyst prepared by the method.

A catalyst for the oxychlorinating reaction of ethene to prepare dichloroethane is composed of the carrier (aluminum oxide-titanium oxide microballs), primary active component (Cu) and secondary active component consisting of at least one of La, Ce, Nd, Pr and Y, one transition metal and at least one alkali metal. Its preparing process includes preparing carrier by codeposition, and dipping in active components.

The invention provides a chloration method for phenoxyacetic acid and derivatives thereof, which comprises the following steps that: raw materials of the phenoxyacetic acid or the derivatives of the phenoxyacetic acid and chlorinating agents take reaction at a certain temperature in organic solvents under the effect of catalysts, wherein the chlorinating agents can be chlorine gas, sodium hypochlorite, calcium hypochlorite and sulfuryl chloride, the catalysts can be lewis acid and sulfurated substances, and solvents can be dichloromethane, dichloroethane, trichloromethane, carbon tetrachloride, formic acid, ethyl acetate, benzene, toluene, dimethylbenzene, chlorobenzene and o-dichlorobenzene. The method has the advantages that the operation can be carried out under the waterless condition, the generation of a large amount of industrial waste water is avoided, the used catalysts are safe and are easy to obtain, the solvents can be cyclically used, and the industrialization is easy.

An improved method of synthesizing a macrocyclic tetraamido compound includes protecting the amino portion of an amino carboxylic acid to form a protected amino carboxylic acid; exposing the protected amino carboxylic acid to a first solvent, preferably a hydrocarbon solvent, such as toluene or 1,2-dichloroethane, dichloromethane, dibromomethane and 1,2-dibromoethane. The carboxylic acid portion of the protected amino carboxylic acid is then converted to an activated carboxylic acid by one of esterification or acid halide formation, to form a protected amino activated carboxylic acid derivative. The protected amino activated carboxylic acid derivative is reacted with a diamine in the presence of a second solvent, such as THF or ,2-dichloroethane, dichloromethane, dibromomethane and 1,2-dibromoethane, to form a protected diamide diamine intermediate. Following deprotection, the diamide diamine intermediate is reacted with an activated diacid, such as an activated malonate, oxalate or succinate derivative to form the macrocyclic tetraamido compound. The macrocyclic tetraamido compound may further be complexed with a transition metal.

The invention provides a preparation method and application of a graphene/carbon nano-tube composite. The preparation method comprises the following steps: oxidizing graphene powder and a multiwalled carbon nano-tube together to obtain graphene oxide and an oxidized carbon nano-tube; carrying out ultrasonic peeling and dispersion on the graphene oxide and the oxidized carbon nano-tube; carrying out modification connection and reduction on the graphene oxide and the oxidized carbon nano-tube with ammonia water and ethylenediamine; and filtering, washing and drying a product after reaction to obtain the graphene/carbon nano-tube composite. The preparation method is simple and convenient, and reaction conditions are mild; in the preparation method, the graphene is connected with the carbon nano-tube through covalent modification, and the carbon nano-tube is connected between graphene slice layers. The graphene/carbon nano-tube composite prepared by the method has a fluffy and porous three-dimensional skeleton structure, and can be used for extracting and detecting melamine, clenbuterol, sulfadimidine sodium, indoleacetic acid, bambuterol, clorprenaline, dicofol, 2,2-bis(4-chlorophenyl)-1,1-dichloroethane or chlorofluoro thiochromanone.

The invention discloses a method for preparing bromination polystyrene, which includes (1) adding 10-30 parts by weight of styrene into 100 parts by weight of dichloroethane and adding 0.1 to 0.5 parts by weight of BPO or AIBN to obtain polystyrene dichloroethane solution; (2) adding 0.1 to 3 parts by weight of lewis acid catalyst and 0.1 to 3 parts by weight of backbone protective agent in the above prepared solution and then dropping 30 to 90 parts of bromine chloride dichloroethane solution to obtain bromination polystyrene dichloroethane solution; (3) adding 00.5 to 0.1 parts by weight ofneutralizer into the above prepared solution, conducting washing and static layering, adding 0.1 to 3 parts by weight of fat removing bromine preventing agent in the layered organic layers, conducting flash evaporation, cooling, centrifugation and drying on the organic layer to obtain the product. The process is capable of manufacturing polystyrene with narrow molecular weight distribution, and the polystyrene can obtain bromination polystyrene with controllable molecular weight after bromination.

The invention discloses a composite functional fluorine-removing resin, which belongs to the field of resins. The resin is based on styrene-divinylbenzene resin, the structural unit is , contains functional groups -NH2 and -SO3-X (Fe/Al), the particle size is 0.3-0.5mm, and the saturated adsorption capacity for F- is 2.16~8.10mg/g. The preparation method is: take styrene-divinylbenzene resin as the matrix, add 60-80% concentrated nitric acid and 75-98% concentrated sulfuric acid to react at 40-80°C, and stir for 0.5-3 hours to obtain the loaded nitro Resin R-NO2; use dichloroethane as swelling agent, add 80-98% concentrated sulfuric acid to react at 70-120°C, stir and react for 8-16 hours to get nitro-sulfonic acid resin R-NO2 -SO3H; at 60-100°C, add SnCl2·2H2O, concentrated hydrochloric acid, ethanol, and reflux for 8-16 hours to obtain amino-sulfonic acid resin R-NH2-SO3H; at 20-60°C, add 0.1-1.0 mol/L iron salt or aluminum salt solution, stirred and reacted for 18-30 hours, and the composite functional fluorine removal resin R-NH2-SO3-X (Fe/Al) modified by amino groups and supported by metals was prepared. The composite functional fluorine removal resin prepared by the invention can be used for high-efficiency and deep fluorine removal.

The invention relates to a catalyst for cracking 1,2-dichloroethane to prepare vinyl chloride and its preparation method and application. The catalyst uses activated carbon as a carrier and supports nitrogen-containing compounds. The catalyst is based on the total mass of the catalyst. The mass percentage of nitrogen-containing compounds is 16.7% to 44.4%. The catalyst prepared by the preparation method provided by the invention has better catalytic performance, can reduce the temperature for preparing vinyl chloride from 450-500°C in the current industrial pyrolysis to 280-300°C, and increase the single-pass conversion rate of dichloroethane from 50%. The selectivity of vinyl chloride can reach 93%, and the selectivity of vinyl chloride can also reach 99.3%, and has a long service life of nearly 100 hours, and the catalyst raw materials are cheap and easy to obtain, and the preparation process is simple. The catalyst is not only suitable for the cracking of dichloroethane, but also suitable for the reforming of acetylene dichloroethane to prepare vinyl chloride.

The invention provides a preparation method of bromized polystyrene. The method is characterized in that sulfur is taken as the scavenging agent of a small amount of water in the electrophilic bromination reaction of the polystyrene and as the quencher of free radical in the electrophilic bromination reaction of the polystyrene, and the mass of the sulfur is 0.1 to 12 percent of that of the polystyrene. In the organic solvent of dichloroethane, chloroform, bromochloromethane, carbon tetrachloride or tetrachloroethane, the anhydrous aluminium trichloride, the anhydrous ferric chloride, the titanium tetrachloride, the antimonous chloride, the aluminum powder, the zinc powder or the iron powder is taken as the catalyst, the sulfur is taken as the scavenging agent of the small amount of water and as the quencher of the free radical, and the bromized polystyrene is prepared by the electrophilic bromination reaction between the polystyrene and the bromine.

The invention relates to a preparation method of 2-hydroxyl-1-{4-(2-hydroxyethyl) phenyl}-2-methyl-1-acetone, which comprises the following steps that: ethylene glycol phenyl ether acetate serves as the raw material and carries out friedel-crafts reaction with isobutyl chloride with the molar ratio of 1 to 1.2 times of equivalent under the catalysis of lewis acid, the reaction temperature is -5 to 5DEG C, and the reaction time is 3 to 6h; bromination is carried out under the catalysis of N, N-dimethylformamide or iodine; at room temperature, phase transfer catalyst is used for carrying out catalysis and hydrolysis to a brominated product; and finally the product is prepared through purification and crystallization. The preparation method of 2-hydroxyl-1-{4-(2-hydroxyethyl) phenyl}-2-methyl-1-acetone adopts dichloromethane or dichloroethane as the solvent during the bromination process, does not use acetic acid any more, carries out reaction under the catalysis of DMF or I2, so that the reaction time is greatly shortened. The phase transfer catalyst is introduced during the hydrolysis process, so that the intermediate brominated product directly has reaction with alkali in water, thereby preventing using a large amount of ethanol as the solvent, simplifying the process, reducing the production cost and improving the yield.

The invention discloses polyethylene glycol-chitosan self-assembled nanoparticles and a preparation method thereof, belonging to the technical field of preparation of a functional material. Chitosan derivative with water solubility and biocompatibility is obtained by modifying chitosan by polyethylene glycol, so as to prepare the polyethylene glycol-chitosan self-assembled nanoparticles. The polyethylene glycol-chitosan self-assembled nanoparticles have the advantages that TEMED (tetramethylethylenediamine).HCL is taken as a diluent; EDC (dichloroethane) and NHS are taken as activating agents under a mild condition; the polyethylene glycol chitosan derivative with water solubility and biocompatibility is prepared by grafting mPEG-COOH on CS in a covalent coupling manner and modifying the chitosan by PEG (polyethylene glycol), so that the nanoparticles can be formed in a water solution in a self-assembling manner.