37results about How to "Reduce the degree of coking" patented technology

The invention relates to a low-shrinkage high-strength polyester industrial yarn and a preparation method thereof. The preparation method comprises: carrying out solid phase condensation polymerization tackifying on a modified polyester, melting, metering, extruding, cooling, oiling, drawing, carrying out heat setting, and winding, wherein the unchanged longitudinal height is maintained during thecooling, the cross section area of the slow cooling chamber is increased while the plate surface temperature of the spinning plate is maintained by using the thermal insulation method, and the oil agent for oiling contains 67.30-85.58 wt% of crown ether. According to the present invention, the preparation method is simple; the material of the prepared low-shrinkage high-strength polyester industrial yarn is the modified polyester with the molecular chain including a terephthalic acid chain segment, an ethylene glycol chain segment and a diol chain segment having the branched chain, the fracture strength is more than or equal to 7.3 cN/dtex, and the dry heat shrinkage rates at the conditions comprising 177 DEG C, 10 min and 0.05 cN/dtex and the conditions comprising 190 DEG C, 15 min and 0.01 cN/dtex respectively are 1.8+/-0.5% and 3.5+/-0.5%.

The invention relates to a binderless ZSM-5/beta symbiotic molecular sieve catalyst and a preparation method thereof. The binderless ZSM-5/beta symbiotic molecular sieve catalyst is mainly used for solving the problems in the prior art that the activity is relatively low when the prepared ZSM-5/beta symbiotic zeolite molecular sieves contain binders and the strength is relatively poor when the prepared ZSM-5/beta symbiotic zeolite molecular sieves do not contain the binders. According to the binderless ZSM-5/beta symbiotic molecular sieve catalyst and the preparation method thereof, through adopting the technical scheme of firstly carrying out mixed shaping on silicon and aluminum raw materials, then, converting the silicon and aluminum raw materials into ZSM-5 and beta zeolite molecular sieves with the shape index of 3-100 by using a mixed aqueous solution of organic amine and organic quaternary ammonium base, and carrying out modification, thereby forming the binderless ZSM-5/beta symbiotic zeolite molecular sieve catalyst; the problems are better solved, and the prepared binderless ZSM-5/beta symbiotic molecular sieve catalyst with the shape index of 3-100 can be applied to the industrial production of preparing propene through cracking alkenes.

The invention relates to a method for producing propylene by catalytic cracking of C4 olefin. The method mainly solves the problem that the existing catalyst has poor stability and low propylene selectivity. The method comprises forming ZSM-5 molecular sieve raw powder with a shape index of 3-100 from raffinate C4, carrying out alkali treatment to obtain a molecular sieve catalyst having a composite channel structure, and carrying out a reaction process under conditions of a reaction temperature of 400 to 600 DEG C, reaction pressure of 0 to 0.3MPa and a weight airspeed of 1 to 50h<-1>. The method well solves the problem and can be used for industrial production of propylene by catalytic cracking of C4 olefin.

The invention relates to a high-modulus low-shrinkage stiff cord and a preparation method thereof. The preparation method comprises the following steps: performing solid-phase polycondensation-viscosity enhancement, melting, metering, extrusion, cooling, oiling, stretching, heat setting and winding to obtain high-modulus and low-shrinkage polyester industrial yarns; twisting to obtain a cord; making the cord into a high-modulus low-shrinkage stiff cord by a two-bath impregnation method, wherein during cooling, the longitudinal height is kept constant and the cross-sectional area of a slow cooling chamber is increased; meanwhile, the surface temperature of a spinneret plate is kept in a heat preserving way in the slow cooling chamber; an oiling agent contains 67.30 to 85.58 percent by weight of crown ether; during use of the oiling agent, 14 to 18 percent by weight emulsion is prepared with water. The preparation method disclosed by the invention is simple; the prepared high-modulus low-shrinkage stiff cord is made from modified polyester of which the molecular chain includes a terephthalic acid chain segment, an ethylene glycol chain segment and a dihydric alcohol chain segment with a branched chain, is greater than or equal to 80N in breaking strength, and is greater than or equal to 37KN/m in cord bonding strength.

The invention discloses a flame detector cooling device which comprises a flame detector probe (1), a cooling air blow-off nozzle (2) of the flame detector probe, an outer cooling tube (3), an optical fiber (4) and an inner cooling tube (5). The flame detector cooling device is characterized in that the flame detector probe (1) is arranged in the outer cooling tube (3); the inner cooling tube (5) is sleeved in the outer cooling tube (3); and the optical fiber (4) is arranged in the inner cooling tube (5), one end of the optical fiber (4) is connected to the flame detector probe (1) while the other end of the optical fiber is connected to an external system, and a flame detecting optical fiber protecting pipe is changed from a single-layered cooling air duct into a double-layered cooling air duct, so that problems that the optical fiber is easy to damage, the flame detecting probe is easy to clog and the like are solved.

The invention relates to a binder-free ZSM-5 molecular sieve catalyst, and a preparation method and a use thereof. The problems of low activity of a binder-containing ZSM-5 molecular sieve in the prior art and low intensity of a binder-free ZSM-5 molecular sieve in the prior art are mainly solved. The binder-free ZSM-5 molecular sieve catalyst comprises 90-100wt% of a ZSM-5 molecular sieve with the shape index of 3-100 (the shape index is defined as a length ratio of a longest edge to a shortest edge of a molecular sieve crystal in a three dimensional direction), 0-5wt% of a P element or oxide thereof, and 0-5wt% of at least one of V, Cr, Mn, Fe, Co and Ni, or oxide thereof. The preparation method well solves the problems, and the binder-free ZSM-5 molecular sieve catalyst prepared in the invention can be used in the industrial production for preparing propylene by using methanol.

The present invention relates to a method for refining 4-aminodiphenylamine by adopting three-column continuous rectification and intermittent distillation. The crude product of 4-aminodiphenylamine can be obtained by rectification in the column No.1, and the substances of phenylamine, phenazine and azobenzene can be obtained at the top of column, said crude product can be purified in column No.2, in the column No.3 the phenylamine is separated, and the intermittent column can be used for making batch distillation of 4-aminophenylamine made up by using column bottoms of column No.2 and returning it into column No.2 for refining it. The yield rate of its whole process can be raised to 99% from 94%, and the content of 4-aminodiphenylamine in the finished product is greater than 99 wt%, at the same time the phenylamine can be recovered, and can be used.

The invention relates to a laying method of a refractory belt in a boiler furnace. The refractory belt is arranged on water screens of the four sides of the boiler furnace. The laid refractory belt is of rectangular and is divided into four small parts. The space among the four parts is cross-shaped. The horizontal space and the vertical space between every two of the four small parts are both 1meter. The upper rectangular refractory belt keeps a 1meter space with the lower rectangular refractory belt. All four small rectangles are 0.5-1meter long and wide. The big rectangular refractory belt is 6-7 meters long and 4.5-5.5meters wide. The laying method of the refractory belt in the boiler furnace can be put into operation during the boiler outage period. The practice of a company where the boiler works for continuous half a year after changing the laying method of the refractory belt proves that, compared with the state before changing the laying method of the refractory belt, the input amount of desuperheated water increases obviously, the main steam temperature is easy to be adjusted by hand and the overranging rate of the main steam temperature decreases obviously, the coking degree in the boiler furnace is obviously lessened, thus guaranteeing the safe and economical operation of the boiler and achieving the anticipated effects.

The invention provides a catalyst for preparing propylene through methanol conversion as well as a preparation method and application thereof. The preparation method of the catalyst for preparing propylene through methanol conversion comprises the following steps: mixing a tetrapropylammonium bromide aqueous solution, a water glass aqueous solution and a sodium metaaluminate aqueous solution to obtain a mixed solution; carrying out crystallization treatment on the mixed solution at 150-210 DEG C for at least 6 hours, and washing, drying and roasting a crystallization product to obtain a Na-type ZSM5 molecular sieve; and carrying out ion exchange on the Na-type ZSM5 molecular sieve and an ion exchange solution, washing, drying and roasting to obtain the H-type ZSM5 molecular sieve. The preparation method provided by the invention is simple in technological process, good in repeatability and suitable for industrial production; the catalyst for preparing propylene by converting methanol obtained by the preparation method has the characteristics of high propylene selectivity and good catalytic stability.

The invention relates to the field of catalysts and discloses a silicon-zinc-modified catalyst carrier and a preparation method and application thereof. The method comprises contacting modified silicone oil and a water-soluble zinc compound with an alumina carrier, wherein the modified silicone oil comprises one or more of alkyl-modified silicone oil, polyether-modified silicone oil, epoxy-modified silicone oil, amino-modified silicone oil, polymer-modified silicone oil and hydroxyl-modified silicone oil. The preparation method improves the surface acid amount and the acid strength of the carrier so that the carrier can be used for preparation of a highly active hydrotreatment catalyst.

The invention relates to the field of production of mesophase pitch, in particular to a system and a method for continuously producing mesophase pitch. The system comprises a feeding device and a reaction device which are connected in sequence, wherein the feeding device is used for melting raw materials and heating the raw materials to a reaction temperature, and the reaction device is used for converting the materials from the feeding device into mesophase pitch in a free downward flowing mode under a non-stirring condition; the reaction device is a cylindrical container with a height-diameter ratio of greater than 3; the reaction device comprises a liquid material inlet located in the upper part of the reaction device, and a liquid material outlet is located in the bottom of the reaction device; and a stirring part and a filler are not arranged in the reaction device. The system and the method provided by the invention can further improve the uniformity of an obtained mesophase pitch product and the content of the mesophase pitch on the premise of ensuring good comprehensive performance of the obtained mesophase pitch product.

The invention discloses a building construction method for an expansion device of a household garbage incineration boiler. The building construction method comprises the following steps of construction preparation and inspection, welding of furnace wall metal pieces, construction of pouring materials on the inner side of the upper portion of the expansion device, construction of pouring materials on the lower portion of the expansion device, laying of Z-shaped expansion joint aluminum silicate fiber cotton, installation of phi 120 aluminum silicate fiber ropes and construction of pouring materials on the outer side of the upper portion of the expansion device. When the construction method is used for building the expansion device of the household garbage incineration boiler, the problems of deformation and damage of the expansion device of the household garbage incineration boiler and a building layer in the area range of the expansion device can be effectively solved; the phenomena of throttling, blocking, coke hanging and the like caused by burning loss, damage, cracking and falling of the building layer are effectively avoided; normal and stable operation of a unit is guaranteed; the overhaul and maintenance period is shortened; the combustion efficiency of the boiler is stabilized; environmental pollution is reduced; the technology is advanced; and practicability is high.