151 results about "Dichloropropane" patented technology

The invention discloses a preparation method of improved 4,4-dichlorodiphenylsulfone. The method comprises steps that: (1) Al2Cl3 is adopted as a catalyst; chlorobenzene, thionyl chloride are adopted as reaction materials; the materials are subject to a Friedel-Crafts reaction; a mother liquor obtained after the reaction is hydrolyzed; the hydrolyzed mother liquor is refluxed for 45 to 60min under a temperature of 95 to 100 DEG C; after refluxing, the mother liquor is cooled to below 20 DEG C, such that the liquor is divided into an organic phase and a water phase; the organic phase is processed through reduced-pressure distillation and centrifugal washing until the organic phase turns neutral, and the organic phase is preserved as a product M for later use, wherein a main component in the product M is 4,4-dichlorodiphenylsulfone; (2) the product M and an oxidizing agent of hydrogen peroxide are adopted as raw materials, and 1,2-dichloropropane is adopted as an organic solvent; an oxidizing reaction is carried out upon the main component 4,4-dichlorodiphenylsulfone in the product M under the effect of a composite catalyst, such that a 4,4-dichlorodiphenylsulfone crude product is synthesized, wherein the composite catalyst is phosphotungstic acid or silicotungstic acid loaded on active carbon. Therefore, the method provided by the invention has advantages of high yield and good product quality. With the method, wastewater can be circulated and reused.

A monochloro-fluoropropene preparation belongs to the intermediate preparation technical field of coolant, foaming agent and fluorine compounds, which comprises that under catalyst condition, the telomeric reaction on chloromethane and chloroalkene is processed to prepare pentachloro-propane, which is fluorinated with hydrogen fluoride via the catalysis of composite catalyst to prepare trifluoro-dichloropropane, and hydrogen chloride is removed via the alkali alcohol liquid catalysis to obtain monochloro-fluoropropene as final product. The invention has the advantages that the preparation fluorinates pentachloro-propane into trifluoro-dichloropropane, to remove hydrogen chloride to obtain monochloro-fluoropropene, thereby avoiding azeotropic material and sub isomer generated in the fluorination from pentachloro-propane to monochloro-fluoropropene, while the whole process has low reaction temperature to save energy, and the monochloro-fluoropropene product has reach 99.0-99.6% purity and 80.70-88.05% yield, to meet industrial batch production.

Processes for the production of chlorinated propenes are provided. The present processes make use of 1,2-dichloropropane, a by-product in the production of chlorohydrin, as a low cost starting material, alone or in combination with 1,2,3-trichloropropane. The present processes can also generate anhydrous HCl as a byproduct that can be removed from the process and used as a feedstock for other processes, providing further time and cost savings. Finally, the processes are advantageously conducted in the liquid phase, thereby presenting additional savings as compared to conventional, gas phase processes.

The invention discloses a preparation method of 2,3,3,3-tetrafluoropropylene. 1,1-difluoro-2-vinyl chloride and chlorofluoromethane are subjected to an addition reaction in presence of a catalyst to generate 1,1,1-trifluoro-2,3-dichloropropane, and 2,3,3,3-tetrafluoropropylene is prepared under catalysis of 1,1,1-trifluoro-2,3-dichloropropane through three routes. 1,1-difluoro-2-vinyl chloride which is harmful to human bodies and the environment is used as an initial material, and the environment is protected. A continuous tubular reactor is adopted for the reaction in the method, reaction conditions are easy to control, and equipment is simple to operate; conversion rate in each step of the preparation method is high, yield of the target product is higher, and the method has extensive industrial application prospect.

The invention relates the cleaning agent and preparing method. The cleaning agent comprises 60-80% dichloropropane, 5-20% methylchloro-form and 5-20% difluo-monochloroethane. The cleaning agent has the advantages of good cleaning effect, non remain, and good insulativity. The cleaning agent has good withstand voltage, and the pressure resistance value is 25kv. The cleaning agent solves the problem that moisture coagulated on the surface of substance.

The invention provides a substitution and dehydration method for water contained solid materials and a device. In the method, the material is dehydrated by organic solvents with low boiling point and low latent heat, which are liquid at 0 DEG C to 60 DEG C and 0.1 MPa to 3 MPa, such as propane, dichloropropane, epoxy ethane, dimethyl ether, dimethyl sulphide and a mixture thereof or a mixture of the organic solvents and a surface active agent with low adsorbability and low latent heat, in dehydration equipment through the action of leaching, absorbing, substituting and the like and liquid-solid separation. The solvents and water can be separated and recycled by evaporating water bearing solvents in separation equipment and condensating the solvents in condensation recovery equipment or layering the solvents and water. Because the latent heat of the solvents is far less than that of the water, the solvent substitution and dehydration method and the device thereof of the invention can obviously reduce power consumption in the dehydration process, solve the problems of burning, wall built-up and the like through low operation temperature, and are suitable for dehydration of solid materials with different water contents.

A method of fabricating a semiconductor device includes the steps of forming a step region having a mesa shape in a direction of <011> or <0-11> on a (100) plane of an InP-based compound semiconductor crystal, and burying the step region with InP-based buried layers grown by vapor-phase growth by supplying a base gas to which a chlorinated organic compound is added, the organic chlorine compound including at least two carbon atoms, and each of the carbon atoms is bonded to one chlorine (Cl) atom in one molecule. The chlorinated organic compound is any one of 1,2-dichloroethane, 1,2-dichloropropane, and 1,2-dichloroethylene.

The invention relates to the technical field of chemical synthesis of medicines, in particular to a preparation method of melatonin. The preparation method of the melatonin comprises the following steps: (a) subjecting phthalimide, 1,3-dichloropropane, sodium iodide and ethyl acetoacetate to a reaction in a solvent under the action of alkali to obtain a compound I; (b) performing a ring closing reaction on the compound I and p-methoxyphenyl diazonium salt in the presence of alkali and a solvent to obtain a compound II; (c) hydrolyzing the compound II under an alkaline condition, and carrying out decarboxylating under an acidic condition to obtain a compound III; and (d) carrying out an acetylation reaction on the compound III to obtain melatonin. According to the preparation method, phthalimide, 1,3-dichloropropane, ethyl acetoacetate and the like are used as raw materials, and the price of the raw materials is low; the intermediate compound I can be obtained through a one-step method,so reaction steps and time are shortened; moreover, the conditions of each reaction step are relatively mild, the raw materials are easy to obtain, and high yield can be obtained.

The invention discloses trans 1, 3-dichloropropene and cis 1, 3-dichloropropene compound, and technological process thereof, and belongs to the field of chemical technology. According to the technological process, three column continuous or four column continuous integral technology is adopted, an adopted first column is a crude extracting column, wherein a black raw material DD mixture (industrial dichloropropane) is converted to be white from black in the first column, and then is introduced into a second column; the second column is a weight-removing column, and is used for removing weightfractions in the discolored material obtained after passing of the raw material DD mixture through the crude extracting column, after weight removing, the material is introduced into a third column for production; the third column is a light-removing column, wherein after weight removing, the material is introduced into the third column for light removing, 1, 2-dichloropropene is removed, and sideline discharging is adopted for collection of trans 1, 3-dichloropropene and cis 1, 3-dichloropropene at the same time or collection of only cis 1, 3-dichloropropene; and a fourth column is a repeatlight removing column. Replacement of chemical products which are not beneficial for environmental protection is realized; insect and disease prevention rate is high; and it is beneficial for crop growth.

The invention discloses a method for preparing 1-chloropropene by catalytic dehydrochlorination of 1, 2-dichloropropane. The catalyst comprises an active ingredient and a carrier. The active ingredient is M1-M2-M3, M1 represents a chloride of Fe or Co, M2 represents a compound of Pt or Pd, and M3 represents a chloride of Ce or La. The carrier is gamma-Al2O3, molecular sieve or activated carbon. The method comprises putting the catalyst into a fixed-bed reactor, feeding nitrogen gas into the fixed-bed reactor, heating the nitrogen gas to 300 DEG C, and feeding 1, 2-dichloropropane into the reactor for a reaction at 300-400 DEG C, wherein a nitrogen airspeed is maintained at 500-2000h<-1>. A conversion rate of the raw material 1, 2-dichloropropane is in a range of 85.7% to 90.6% and the selectivity of the 1-chloropropene is 99.2% to 99.6%. A ratio of trans-1-chloropropene to cis-1-chloropropene is 3:1.

Processes for the production of chlorinated propenes are provided. The present processes make use of 1,2-dichloropropane, a by-product in the production of chlorohydrin, as a low cost starting material. 1,1,1,2,2-pentachloropropane produced by the process is subjected to catalytic dehydrochlorination and build-up of the same within the process is avoided.

The invention discloses waterborne environmental friendly putty used for priming the surfaces of wood, new materials, stone and the like, the putty comprises the following components by weight percent: 8 percent of novolak, 16 percent of diluent, 63 percent of putty powder, 9 percent of clear water and 4 percent of suspension liquid, the diluent comprises 50 percent of butyl acetate, 10 percent of ethyl acetate, 30 percent of dichloropropane and 10 percent of methyl ethyl ketone, and the putty powder comprises the following components by weight percent: 90 percent of calcium carbonate, 4 percent of calcium sulfate and 6 percent of magnesium silicate. The components are mixed together, the prepared putty is mildly acidic and is used for partially filling and fully filling the surface of a coated and scraped object, the putty can make the object surface smooth, enhance the polishing smoothness and improve the fullness of the object surface, and the operation is simple, safe and reliable.

The invention discloses a preparation method of 1,2-propane diamine, which comprises the following steps of: adding 1,2-dichloropropane, water, liquid ammonia and a catalyst in a high-pressure reactor, raising the temperature to 160-180 DEG C and the pressure to 8-12MPa, and keeping the conditions for reacting for 4-5h; and sampling for carrying out GC (Gas Chromatograph) detection, completely reacting the 1,2-dichloropropane, cooling a reaction system to 20-25 DEG C, discharging excessive ammonia gas, preparing a mixture using the 1,2-propane diamine as a main component, and rectifying the 1,2-propane diamine to obtain a finished product. According to the preparation method, the process steps are greatly simplified, pollution emission does not exist basically, and the cost is lowered. Excessive ammonia after the reaction is ended can be recycled, and the preparation process can be completed in one high-pressure reactor, so that the investment and production efficiency of equipment are greatly reduced. According to the invention, complete reaction can be completed by adopting one catalyst, and low distillates obtained after rectification can be used as raw materials for recycling, so that the selectivity of the 1,2-propane diamine is greatly increased.

The invention relates to a multipurpose adhesive. The multipurpose adhesive is specifically prepared from the following components in parts by mass: 35 to 45 parts of chloroprene rubber, 10 to 15 parts of styrene, 25 to 40 parts of waterborne polyurethane resin, 2 to 5 parts of a dispersant, 5 to 8 parts of toluene, 3 to 9 parts of dimethyl carbonate, 1 to 4 parts of dichloropropane, 35 to 40 parts of methyl methacrylate, 1 to 4 parts of an emulsifier and 0.07 to 0.2 part of a catalyst. An experiment shows that the multipurpose adhesive provided by the invention has the characteristics that the dynamic viscosity is 9.7Pa.s or more and the peeling strength is 6.1kg/25mm or more; an existing multipurpose adhesive has the characteristics that the dynamic viscosity only can reach 8.9Pa.s and the peeling strength is only 4.9kg/25mm; it can be seen that adhering performances including the viscosity, the peeling strength and the like of the adhesive are greatly improved through improving raw materials and a production process of the adhesive; the multipurpose adhesive has a remarkable effect and a wide market prospect.

Aminomethylated bead polymers for use as ion exchangers, especially as anion exchangers, or for the preparation of chelate resins, are prepared in the presence of 1,3-dichloropropane as solvent and swelling agent

The invention relates to a plastic-rubber high molecular composite synthetic resin adhesive which comprises the following components: para-tertiary butyl phenol-formaldehyde resin, chloroprene rubber, magnesium oxide, C5/C9 copolymerized petroleum resin, BTH (butylated hydroxytoluene) antioxidant, methyl acetate (refined), ethyl acetate, dichloropropane, methylbenzene and 120#solvent oil. On the basis of giving a full play to the advantages of the phenol-formaldehyde synthetic resin, the magnesium oxide is added and the chloroprene rubber linear high molecular material and the C5/C9 copolymerized petroleum resin having high adhesion property and good heat resistance are introduced to perform grafting, chelation and other high molecular reactions on the molecular structure so as to form a copolymer with the phenol-formaldehyde resin, thus obtaining the plastic-rubber high molecular composite high-performance synthetic resin adhesive having multiple comprehensive performances. The plastic-rubber high molecular composite synthetic resin adhesive has high bonding strength and good water resistance, heat resistance and chemical stability, and has the composite high performances of a plastic-rubber high molecular elastomer such as pliability, flexibility and the like.

The invention discloses a multi-purpose paint diluting agent and a preparation technology thereof. The multi-purpose paint diluting agent is prepared from the following raw materials: ethylene glycolmonoethyl ether acetate, dichloropropane, pentaerythritol, cyclohexanone, tetrabutyl orthosilicate, ethyl cellosolve, diethoxymethane, methyl isopropyl ketone, turpentine and isophoron. The paint diluting agent prepared by the preparation technology does not contain benzene toxic substances, is safe and has no toxin, and has good stability and strong dissolubility; various types of paint can be dissolved through the multi-purpose paint diluting agent; the production flow is simple, the production cost is low and no three wastes are discharged, so that the multi-purpose paint diluting agent hasa good application prospect.

The invention discloses a batch extractive distillation and separation method for ethanol-benzene azeotrope, and belongs to the separation technology of ethanol-benzene azeotrope. The method adopts halogenated hydrocarbon or aromatic hydrocarbon, which contains two or more halogen substituents such as 1,2-dichloropropane, 1,2,3-trichloropropane, o dichlorobenzene, and 1,2,3-trichloro-benzenes, as the extractant. Operation condition of extractive distillation column is that the mass ratio of extractant to overhead is in the range of 0.5:1 to 10:1. Ethanol, ethanol-benzene transition section I, benzene, and benzene-benzene extractant transition section II are respectively extracted from the top of the extractive distillation column by controlling different temperature and different reflux ratio of the top of the extractive distillation column. When the composition of the extractant in the bottom of the column meets the requirement, the extractant is pumped into a high-position storage tank for recycling. The batch extractive distillation and separation method for ethanol-benzene azeotrope has the advantages that ethanol-benzene azeotropic system is broken by extractant, so high-pure ethanol and benzene products are extracted, operation of single column is simple, and equipment cost is low.