51results about How to "Not easy to polymerize" patented technology

The invention discloses a biological diesel preparing method from high-acid value cotton seed oil, which comprises the following steps: the first step: adopting concentrated sulfuric acid as catalyst under normal pressure and temperature; injecting certain quantity of carbinol; reacting most of glyceride and a little of aliphatic acid with carbinol; sedimenting and separating glycerin and water; the second step: adopting concentrated sulfuric acid as catalyst under normal pressure and temperature; injecting excessive carbinol; lengthening reacting time to react glyceride and aliphatic acid with carbinol. The invention can utilize cotton oil reasonably, which reduces the environmental pollution in the refinery course.

The invention relates to an aromatic hydrocarbon liquid phase alkylation method, for mainly solving the problem that a catalyst is easily inactivated and poor in stability in the prior art. According to the technical scheme, a mixture containing saturated alkane, aromatic hydrocarbon and olefin is taken as a raw material, silicon-aluminum crystal zeolite is taken as a catalyst, and the raw material comes into contact with the catalyst to react to generate an alkylation liquid containing alkylbenzene and polyalkylbenzene under the conditions that the reaction temperature is 100-210 DEG C, the reaction pressure is 1.5-5.0MPa, the mole ratio of aromatic hydrocarbon to olefin is 1:10 and the weight space velocity of olefin is 0.1-1.0 hour<-1>, wherein the saturated alkane is at least one of ethane, propane, n-butane, iso-butane, pentane, cyclopentane, methylcyclopentane, hexane or cyclohexane, and the content of the saturated alkane is 1-80% of the weight of the reaction mixture. Due to adoption of the technical scheme, the problem in the prior art is well solved. The aromatic hydrocarbon liquid phase alkylation method can be applied to industrial production of aromatic hydrocarbon liquid phase alkylation.

The invention discloses a preparation method of lipophilic hyperbranched molecule modified nanofluid, wherein the nanofluid is composed of a liquid medium and nanoparticles dispersed in the liquid medium. The preparation method comprises the main steps of preparation and dispersion of the nanoparticles. The surface of the nano material is modified by lipophilic hyperbranched molecules. Compared with the prior art, the preparation method has the advantages that the nano particles are dispersed stably without agglomeration, the nano particles are loaded by utilizing the specific dendritic macromolecular structure of the hyperbranched polyethyleneimine grafted by long-chain alkyl acyl chloride, the number-average molecular weight of hyperbranched molecules is distributed between 1000 and 36000. The prepared nano particles are relatively small in particle size, not easy to agglomerate and good in stability. By the addition amount of 0.01%-5%, the nano fluid with good stability and excellent heat-conducting property can be obtained; and the preparation process is controllable, good in repeatability and easy to popularize.

The invention relates to the field of analysis, in particular to a method for purifying EPA (eicosapentaenoic acid) from fish oil. The method has high selectivity and separation efficiency, EPA, DHA and other impurities can be effectively separated, unsaturated fatty acid and impurities in the fish oil are selectively adsorbed, sample loads are high, a moving phase of an organic solvent or organicsolvent/water system is used, the solvent can be recycled, and industrialization cost is reduced.

The invention discloses Ni/Fe double-metal face-centered cubic crystal nano-particles and a preparing method and application thereof. The liquid phase reduction method is adopted, PVP is used as a stabilizer, NaBH4 is used as a reducing agent, ferrous ions and nickle ions are added step by step for reduction, prepared Ni/Fe double-metal nano-particles are of a regular face-centered cubic structure, particle size distribution is even, particle size is large than the surface area, stability is good, and the polymerism can not easily happen. The prepared nano-particles can effectively catalyze and degrade polychlorinated biphenyl. Needed reaction equipment of the nano-particles is simple, equipment cost is low, the preparation process is high in controllability and simple in operation, the reaction condition is mild, and further industrial production is possible.

The present invention provides an evaporation method and apparatus for an easily polymerizing hydrocarbon solution, said evaporation method includes processes that: the easily polymerizing hydrocarbon solution is fed into a main evaporator(1),the evaporated hydrocarbon gas is discharged from the top of the main evaporator(1), the evaporated liquid components are drawn out via a cycle pump(2) from the bottom of the main evaporator(1), part of them being circularly fed into the main evaporator(1) and part of them being fed into a film evaporator(3). The evaporated hydrocarbon gas is then discharged from the top of the film evaporator(3) and the remnant liquid after evaporation is forced to be discharged from the film evaporator(3). The forced circulation evaporator and the film evaporator in this invention combines to realize the evaporation process, the polymeric monomer in the easily polymerizing hydrocarbon solution is not subject to polymerization, thereby improving the evaporation efficiency, maintaining the steady operation, lowering the consume of source and energy.

The invention discloses a modified molecular sieve catalyst and a preparation method thereof. The modified molecular sieve catalyst is MCM-41/M-N, MCM-41 is a molecular sieve, M is a rare earth metal,N is a polymerization inhibition factor, based on the total mass of the catalyst, the content of M is 1-5%, and the content of N is 1-10%. The catalyst is obtained through multi-step modification such as rare earth metal modification, pore-enlarging modification, polymerization inhibition factor coordination modification, and the like. The invention mainly solves the defects of low catalyst stability, unsatisfactory product selectivity and yield and unsatisfactory process safety in the prior art. The catalyst is used for preparing styrene oxide, the reaction activity and selectivity are improved, the styrene polymerization degree is reduced, the intrinsic safety of the process is improved, the production cost is reduced, various defects in the prior art are overcome, and the catalyst canbe used for industrial production.

The invention relates to the field of photo-functional materials, in particular to a red light excited fluorescent dye. The red light excited fluorescent dye has a structure shown as the formula (I) in the description. The red light excited fluorescent dye has quite wide excitation spectrum, is good in photostability and high in sensitivity, realizes trace detection, can be used in different application fields such as cell imaging, fluorescence probes, laser dyes, fluorescence sensors and the like, and shows good practicability. According to the preparation method, raw material cost is low, nopollution is produced, the process is simple, and yield is high; the prepared fluorescent dye is novel in structure, good in performance and suitable for being widely applied in the fields of biology, environment and the like.

The invention relates to the field of coating performance improvement, in particular to a highly branched polyester product, a thixotropic compound and a coating. According to the highly branched polyester product, esterification polymerization components comprise carboxylic acid and lactone; wherein the carboxylic acid is polyhydroxy acid at least containing two carboxyl groups and one hydroxyl group at the same time and/or polybasic carboxylic acid containing at least three carboxyl groups. The highly branched polyester provided by the invention is polymerized by using carboxylic acid and lactone as monomers, and the highly branched polyester and fumed silica form a more stable space structure, so that the highly branched polyester has remarkable thixotropic enhancement performance; meanwhile, the dosage range is large, synthesis is simple and convenient, raw materials are rich and easy to obtain, and good application and popularization value is achieved.

A wood-plastic floor for a bathroom is prepared from, by weight, 60-70 parts of wood powder, 22-32 parts of PVC resin, 7-11 parts of zinc stearate, 13-22 parts of n-amyl-4-hydroxybenzoate, 15-24 parts of sodium dehydroacetate, 17-25 parts of phenolic resin, 17-25 parts of polypropylene, 17-25 parts of linear low-density polyethylene, 1-3 parts of walnut shells, 0.2-0.4 part of chestnut shells, 8-13 parts of vermiculite, 6-12 parts of kaolin, 5-9 parts of dioctyl phthalate, 1-2 parts of polyacrylamide, 6-13 parts of polyoxyethylene bis(stearate), 12-15 parts of polymethyl sorbate, 7-11 parts of snakegourd fruit vines, 3-7 parts of polyethylene wax, 1-2 parts of activated carbon, 2-3 parts of dandelions, 0.1-0.2 part of wheat germ oil, 0.1-0.2 part of sunflower seed oil and 0.1-0.2 part of edible vinegar. The wood-plastic floor is waterproof and anti-skid, water is not likely to gather on the surface of the floor, components are dispersed, moisture volatility is accelerated, dryness of the surface of the floor is kept, and the floor is resistant to bacterium erosion and worm damage. Besides, the wood-plastic floor is small in specific heat capacity, is warm in winter and cool in summer when people step on the floor, and is particularly suitable for the bathroom to use and wide in application prospect.

The invention belongs to the technical field of building material preparation, and particularly relates to a polycarboxylic acid polymer, a preparation method and application thereof. The method comprises the following steps: (1) adding a polymerization inhibitor and part of unsaturated carboxylic acid into molten unsaturated polyether to form a mixed solution A; (2) preparing a mixed solution B from an esterification monomer and the residual unsaturated carboxylic acid; and (3) adding the mixed solution B into the mixed solution A, and performing bulk polymerization under the action of an initiator to obtain a polycarboxylic acid polymer, wherein in the step (3), inert gas is introduced in the early stage of the reaction, oxygen is introduced in the middle stage of the reaction, and inert gas is introduced in the later stage of the reaction. According to the invention, when the method is used for preparing the polycarboxylic acid polymer, the viscosity of a reaction system can be well controlled, the reaction rate is improved, the whole reaction process is stable, the molecular weight of the obtained polymer is narrow, and the effective content is increased; and the polycarboxylic acid polymer is used as a cement grinding aid, so that the grinding aid has good grinding aiding effect, water-reducing rate and early strength performance, and a solvent does not need to be added in the use process.

The invention discloses a hydrogenation method of a C9 < + > fraction for pyrolysis gasoline. By utilizing a hydrogenation process of carrying out staged hydrogenation and enabling one part of a firstproduct flow to be recycled back to a first reactor and one part of a second product flow to be respectively recycled back to a colloid separation tower, a first reactor and a second reactor, and cooperatively using a catalyst with high low-temperature activity, the operation stability of the device and the hydrogenation activity of the catalyst are improved. According to the method, the export bromine value of the finally prepared hydrogenation product can be reduced to below 3g bromine/100g oil, the export diene value reaches 0g iodine/100g oil, and the sulfur content is reduced to below 3mg/kg.

The invention discloses a pretreating agent for treating polymerization and crystallization of a tower bottom liquid waste of a CTEG rectifying tower. The pretreating agent is prepared from dodecylbenzene sulfonic acid, dodecyl sulfonate, hydroxyethyl diphosphate and ethylene glycol at the mass ratio of (0-2) to (0-2) to (0-2) to (1-2). The pretreating agent is added to the liquid waste at the mass ratio of 0.1-1.8% to be fully mixed, and a stable CTEG liquid waste can be obtained for separation and recovery in the next step, so that polymerization blockage of a pipeline, a pump and the rectifying tower in the separation and recovery processes of the CTEG liquid waste is avoided, and the recovery system can continuously and stable run.