2638 results about "Xylylene" patented technology

A coating composition used for coating of a steel material and/or aluminum material comprises a corrosion inhibitor, a base resin and a curing agent. The corrosion inhibitor may be selected from cerium compounds, lanthanum compounds, molybdate salt compounds, gluconic acid derivative salts, porous base materials, triazole compounds, thiazole compounds, tetracyclines, and metal phosphate salt compounds of ascorbic acid. The base resin may include a xylene-formaldehyde-resin-modified amino-containing epoxy resins obtained by reacting an epoxy resin having an epoxy equivalent of from 180 to 2500 with a xylene formaldehyde resin and an amino-containing compound. The curing agent may be a blocked polyisocyanate compound obtained by blocking an isocyanate group of a polyisocyanate compound with a blocking agent.

A stent-graft endoprosthesis is provided. The graft is a non-textile graft made from biocompatible polymers. The biocompatible compatible polymers include poly-para-xylylene polymeric material. The stent is also coated with a poly-para-xylylene polymeric material. The graft is formed by vacuum vapor deposition of diradicals forming the poly-para-xylylene material. The stent is also coated with the poly-para-xylylene material by vacuum vapor deposition.

The invention provides a catalyst used for preparing para-xylene and low-carbon olefin fluidized bed by selective methylation of toluene with methanol, which is obtained by the modification of zeolite molecular sieve by metal, nonmetal or/and rare earth metal, mixing, spraying, drying and forming of amorphous adhesive containing silicon or aluminium and the zeolite molecular sieve, and decoration of surface acidity and porous structure by siloxane-based compounds, wherein, the content of the alkaline earth metal is 0.1-8wt percent of the total weight of the catalyst, the content of the nonmetal is 0.1-8wt percent of the total weight of the catalyst, the content of the rare earth metal is 0.1-5wt percent of the total weight of the catalyst, and the loading of the Si decorated by the siloxane-based compound is 0.1-10wt percent of the total weight of the catalyst; the catalyst is used for the reaction of preparing para-xylene and low-carbon olefin fluidized bed by selective methylation of toluene with methanol; in the products, the selectivity of the para-xylene in the xylene isomers is more than 99 percent and the selectivity of the ethane and propylene in the composition C1-C5 is more than 90 percent.

A process for producing an olefin polymer using a catalyst in which (A) is a solid catalyst component which includes magnesium, titanium, halogen and an electron donative compound as essential constituents; (B) is an organoaluminum component; and (C) is at least two electron donative compounds (alpha) and (beta), wherein the pentad stereoregularity of a xylene insoluble fraction of a homopolyproylene is 0<mmrr/mmmm<=0.0068 when electron donative compound (alpha) is used in combination with (A) and (B), and the pentad stereoregularity of a xylene insoluble fraction homoproplyene of a is 0.0068<mmrr/mmmm <=0.0320 when electron donative compound (beta) is used in combination with (A) and (B). A polypropylene produced in the process can be used to obtain a biaxially oriented film. (A) and (B). A polypropylene produced in the process can be used to obtain a biaxially oriented film.

The invention discloses a preparation method of hydrogenated xylylene diisocynate. The preparation method of the hydrogenated xylylene diisocynate comprises the following steps: (1) performing salt forming reaction on 1,3-cyclohexanol dimethylamine and concentrated hydrochloric acid in a two-phase reaction solvent to obtain amine salt, wherein the two-phase reaction solvent consists of water and an inert organic solvent insoluble in water ; (2) performing photochemical reaction on the ammonium salt obtained in the step (1) and phosgene in an inert solvent by taking N,N-dimethylformamide or N,N-dimethylacetamide as a catalyst to obtain reaction liquid, and performing aftertreatment on the reaction liquid to obtain the hydrogenated xylylene diisocynate. The preparation method of the hydrogenated xylylene diisocynate has the advantages of complete ammonium salt formation, small grain size of the ammonium salt, low viscosity of the ammonium salt, high space-time conversion rate of photochemical reaction, simple process, low cost and the like.

The invention discloses a method for preparing xylylene diisocyanate (XDI) based on salification-phosgenation reaction. The method comprises the following steps of: (a) a salification reaction process of amine solution which is formed by xylylene diamine in an inert organic solvent and hydrogen chloride; (b) a hydrochloride centrifugal concentration process; (c) a high-pressure phosgenation process; and (d) a low-pressure phosgenation process. In the method, the salification reaction of the amine is kept performing in low-concentration hydrochloride solution all the time; and high-concentration hydrochloride solution participates in the phosgenation reaction to prepare the XDI. The process has a high time-space conversion rate and simultaneously ensures a good salification effect.

The invention relates to a fluidized bed reaction method for preparing para-xylene and coproducing low-carbon olefin with high selectivity by reacting toluene and a methylated reagent. The method adopts fluidized bed reaction technology and uses a catalyst to highly selectively produce the para-xylene and simultaneously highly selectively coproduce ethylene and propylene. The method is characterized in that the raw materials, namely the toluene and the methylated reagent enter a vaporizer for mixing and gasification, pass through a distribution plate, enter a fluidized bed reactor, and are taken as a fluidizing medium and subjected to catalysis with a fluidized catalyst; and gaseous mixture products after reaction are exhausted from the top of a tower and separated. The selectivity of the para-xylene in products in a xylene isomer is more than 99 weight percent, and the selectivity of the ethylene and the propylene in low-carbon hydrocarbon between C1 and C5 is more than 90 weight percent. The carbon deposit catalyst in the reactor continuously enters a regenerator for regeneration and activation and enters the reactor for recycling, can be continuously regenerated and has stable activity; and the method has simple technological flow and is easy to realize large-scale industrialization.

The invention relates to a preparation method of a mesoporous X-type molecular sieve and a method for preparing an adsorbent by using the molecular sieve as an active component. The prepared adsorbent based on the mesoporous X-type molecular sieve is used as a paraxylene adsorptive separation adsorbent. The method for preparing the mesoporous X-type molecular sieve comprises the following steps: by using water glass as a silicon source and aluminum hydroxide as an aluminum source, adding a template, and carrying out hydrothermal synthesis to obtain the mesoporous X-type molecular sieve. The mesoporous molecular sieve and kaolin are proportionally molded to obtain 0.3-0.8mm granules, and the granules are subjected to barium ion or (and) potassium ion exchange until the exchange degree is greater than 99%, thereby obtaining the adsorbent which has excellent adsorptive separation capacity for paraxylene in C8 aromatic hydrocarbons. Compared with the prior art, the active component mesoporous X-type molecular sieve of the adsorbent, which is prepared by using the template, has the crystal form structure of the X-type molecular sieve and the pore distribution of the mesoporous and microporous dual models; the mesoporous pore size distribution is 2nm or so; and thus, the problem of overlow mass transfer rate in the adsorbent can be solved.

Herein is disclosed an oxygen barrier composition comprising an oxygen barrier polymer and an oxygen scavenging polymer. The composition can be in the form of a physical blend or a cross-linked blend, and can further comprise a compatibilizer, a transesterification catalyst, or both. Preferably, the oxygen barrier polymer is poly(ethylene/vinyl alcohol) (EVOH), polyethylene terephthalate (PET), or polyamide other than MXD6. Preferably, the oxygen scavenging polymer comprises an ethylenic backbone and a pendant cyclic olefinic group, or the oxygen scavenging polymer is a polyamide derived at least in part from a xylene diamine-based monomer.

The oxygen barrier composition can be formed into an oxygen barrier layer of a packaging article. Such layers and articles, and methods for making same, are also disclosed.

Improved oxygen barrier and oxygen absorbing compositions and structures comprising blends of xylylene group-containing polyamides and cobalt octoate and xylylene group-containing polyamides, polyesters and cobalt octoate are disclosed and claimed. These blends have superior barrier properties and clarity obtained by controlling the degree of orientation and the amount of cobalt. These novel blends are used as single layers and as the core layer in multiple layer films, structures and articles. When used in multiple layer structures, the adjacent layers are comprised of polyesters and/or polyamides. The structures made from the blends of the present invention have a clarity that is superior to structures previously known in the art.

Clear, high load water miscible emulsions of quinoxalinyl ester herbicides, particularly quizalofop-p-ethyl, as a single phase, translocatable composition which is free of xylene and alkylphenol ethoxylate surfactants and concentrate matrix for the active quinoxalinyl ester component at between about 9 and about 25 wt. % active concentration.

Polyolefin compositions filled with high amounts of inorganic fillers comprising, by weight: (I) 20 to 60% by weight of an heterophasic polyolefin composition comprising: A) from 8 to 25% by weight of a crystalline polymer fraction selected from propylene homopolymer, propylene copolymers and mixture there; and B) from 75 to 92% by weight of an elastomeric fraction comprising at least an elastomeric copolymer of propylene or ethylene with 15 to 45% of at least one alpha-olefin, having solubility in xylene at room temperature greater than 50% by weight, the intrinsic viscosity of the xylene soluble fraction ranging from 3.0 to 6.5 dl/g; and (II) 40 to 80% by weight of an inorganic filler selected from flame-retardant inorganic fillers and inorganic oxides or salts.

A gaseous p-xylylene monomer, formed by reacting xylene with a monatomic oxygen source, is mixed with a functional gaseous monomer. The resulting mixture may be deposited and solidified on a substrate, which may optionally be exposed to a photoinitiating light energy and/or a permittivity enhancing electric or magnetic field. Alternatively, the resulting gaseous mixture may be trapped and condensed in a condenser, which may contain a solvent to facilitate trapping. The condensate may be mixed with a tertiary substance, e.g., another monomer, a reactive substance or an inert material.

The present invention discloses a color asphalt and its preparation method. Its composite includes petroleum asphalt 90# 40-44%, petroleum resin 120# 26-30%, petroleum resin 90# 3-5%, extractive oil 4-6%, xylene 2-4%, santobrite salt 5-7%, 99% chromium 2-4%, iron oxide 30# 3-5%, rosen 3-4% and titanium oxide 1-3% and proper quantity of pigment. Said invention adopts the following processes: reduced pressure distillation for extracting asphaltene, splitting by splitter tower, adding resin material, titanium and pigment, then making high-temp. synthesis. It is a new type builidng material, can be used for laying pavement, etc.

The invention discloses a blocking remover for a reservoir of an oil well. The blocking remover is applied to the technical field of oil extraction in an oil field, comprises an agent A and an agent B, and is characterized in that the weight percentage of the agent A is 25-35%; the weight percentage of the agent B is 65-75%; the agent A comprises the following components by weight: 45-50% of petroleum mixed xylene, 1-2% of nonyl phenol polyoxyethylene (4) ether, and the balance of 0# diesel oil; the agent B comprises the following components by weight: 6-10% of glacial acetic acid or sulfamic acid, 2-2.5% of ammonium bifluoride, 2% of ammonium chloride, 1-2% of citric acid, 1.5-2% of corrosion inhibitor 7801, 3-5% of tertiary butanol, 0.5-1% of octyl phenol polyoxyethylene (10) ether and the balance of water. The blocking remover has the following effects that: the agent A and the agent B are respectively prepared so as to be beneficial to storing the blocking remover for a long time, the agent A of the blocking remover has strong dissolving capacity on crude oil heavy components, such as wax colloid asphalt, and the washing oil efficiency on oil sand is more than 90%. The dissolving rate of the agent B of the blocking remover on carbonate is more than 80%, and the corrosion speed on N80 steel is low and is smaller than 2 g/m<2>.h.

The present disclosure provides methods to produce para-xylene, toluene, and other compounds from renewable sources (e.g., cellulose, hemicellulose, starch, sugar) and ethylene in the presence of a catalyst. For example, cellulose and/or hemicellulose may be converted into 2,5-dimethylfuran (DMF), which may be converted into para-xylene by cycloaddition of ethylene to DMF. Para-xylene can then be oxidized to form terephthalic acid.