31 results about "Tetramethylbenzenes" patented technology

There is provided a process for converting methanol and / or dimethyl ether to a product containing C2 to C4 olefins which comprises the step of contacting a reaction mixture which contains methanol and / or dimethyl ether and at least 10 wt % of a polymethylbenzene component selected from trimethylbenzenes, tetramethylbenzenes and mixtures thereof with a catalyst comprising a porous crystalline material. The contacting step is conducted under conversion conditions including a temperature of about 250° C. to about 500° C. and a methanol and / or dimethyl ether partial pressure of about 5 to about 250 psia (35 to 1725 kPa). The porous crystalline material used in the catalyst has a pore size greater than the critical diameter of the aromatic compound and a Diffusion Parameter for 2,2-dimethylbutane of at least 500 sec<-1 >when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 60 torr (8 kPa).

Synthetic fuels are produced from synthesis gas in a four-stage reactor system with a single recycle loop providing the requisite thermal capacity to moderate the high heat release of the reactions and to provide the reactants and reaction environments for the efficient operation of the process. The first stage converts a portion of the synthesis gas to methanol, the second stage converts the methanol to dimethylether, the third stage converts the methanol and dimethylether to fuel and the fourth stage converts the high melting point component, durene, and other low volatility aromatic components such as tri- and tetra-methylbenzenes to high octane branched paraffins.

The invention relates to a preparation method for nonlinear optical metal-organic boron polymer crystal material provided with equal chirality. The method adopts the steps that firstly, ligand H3L, namely tri-(4-para benzoic acid-2, 3, 5, 6-tetramethylbenzene) borane is synthesized, and then nonlinear optical metal-organic boron polymer crystal material with equal chirality is prepared, namely, ligand H3L and metal salt are mixed according to 1: 2, and dissolved by using N, N-dimethyl acetamide and methyl alcohol, the reaction liquid is positioned into a sample bottle for reaction, after the reaction is finished, the sample bottle is cooled to room temperature, the generated metal-organic polymeric material is taken out, and washed with ether for multiple times and air dried to obtain the material. The structural general formula is <M2L (OH) (MeOH)>.3H2O, wherein, metal M represents cobalt, manganese, nickel, copper, zinc or cadmium. The material produced through the invention has very good second order nonlinear optical property, and compared with KDP, and the generation effect of second harmonics is 1.5 times higher.

The present invention provides a resin powder composition for slush molding which can give slush molded articles with more excellent hydrolysis resistance. The present invention relates to a resin powder composition for slush molding which is characterized by comprising as the main component a thermoplastic polyurethane resin powder, preferably a thermoplastic polyurethane elastomer powder, and containing a polycarbodiimide prepared by polymerizing tetramethylxylylene diisocyanate, alkoxy terminated one having a number average molecular weight of 500 to 30,000.

The invention provides a preparation method of ultralow-metal ion content pyromellitic dianhydride, which comprises the following steps of: taking 1, 2, 4, 5-tetramethylbenzene of which the purity is 96-97 weight% as raw material, oxidizing by air, taking metal oxide which consists of vanadium, titanium, sodium and phosphorus as oxidation catalyst, reacting under the temperature of 380-420 DEG C, cooling by a heat exchanger, absorbing by adsorbent which consists of molecular sieves 3A, 4A and 5A and silicon dioxide under the temperature of 250-350 DEG C, removing harmful organic matters and metal ions, collecting crude pyromellitic dianhydride gathered by a first gathering machine, and recrystallizing, filtering and drying by low-boiling point low-toxicity solvent such as mixed solvent of acetone and butanone to obtain fine pyromellitic dianhydride, wherein the melting point of the fine pyromellitic dianhydride is 286-287.5 DEG C, the yield of the fine pyromellitic dianhydride is 40-45%, the product is crystalloid grain, the grain size of the pyromellitic dianhydride is 300-1000mm, and each content of the contained metal irons is less than 1ppm, i.e., iron, aluminum, nickel, manganese, tin, zinc, potassium, sodium, cobalt, chromium, copper and calcium.

Co-polyimide membranes for separating components of sour natural gas including at least three distinct moieties polymerized together, the moieties including a 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) based moiety; a 2,4,6-trimethyl-m-phenylenediamine (DAM) based moiety; and at least one component selected from the group consisting of: a 4,4′-(hexafluoroisopropylidene)dianiline (6FpDA) based moiety; a 9,9-bis(4-aminophenyl) fluorene (CARDO) based moiety; a 2,3,5,6-tetramethyl-1,4-phenylenediamine (durene diamine) based moiety; a 2,2′-bis(trifluoromethyl)benzidine (ABL-21) based moiety; a 3,3′-dihydroxybenzidine based moiety; and a 3,3′-(hexafluoroisopropylidene)dianiline based moiety.

Co-polyimide membranes for separating components of sour natural gas including at least three distinct moieties polymerized together, the moieties including a 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) based moiety; a 4,4′-(hexafluoroisopropylidene)dianiline (6FpDA) based moiety; and at least one component selected from the group consisting of: a 9,9-bis(4-aminophenyl) fluorene (CARDO) based moiety; a 2,3,5,6-tetramethyl-1,4-phenylenediamine (durene diamine) based moiety; a 2,2′-bis(trifluoromethyl)benzidine (ABL-21) based moiety; a 3,3′-dihydroxybenzidine based moiety; and a 3,3′-(hexafluoroisopropylidene)dianiline based moiety.

Co-polyimide membranes for separating components of sour natural gas including at least three distinct moieties polymerized together, the moieties including a 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) based moiety; a 2,4,6-trimethyl-m-phenylenediamine (DAM) based moiety; and at least one component selected from the group consisting of: a 4,4′-(hexafluoroisopropylidene)dianiline (6FpDA) based moiety; a 9,9-bis(4-aminophenyl) fluorene (CARDO) based moiety; a 2,3,5,6-tetramethyl-1,4-phenylenediamine (durene diamine) based moiety; a 2,2′-bis(trifluoromethyl)benzidine (ABL-21) based moiety; a 3,3′-dihydroxybenzidine based moiety; and a 3,3′-(hexafluoroisopropylidene)dianiline based moiety.

Described is a process for the preparation of monofluoromethylated organic biologically active compounds using monofluoromethylated reagents. Fluticasone Propionate and Fluticasone Furoate can be prepared using, for example, S-monofluoromethyl-S-phenyl-2,3,4,5-tetramethylphenylsulfonium tetrafluoroborate as monofluoromethylating reagent instead of bromofluoromethane.

The invention discloses a method for extracting naphthalene, 1-methylnaphthalene and 2-methylnaphthalene from ethylene tar. The method comprises the following steps of: adding ethylene cracking tar with the total content of naphthalene and methylnaphthalene of not less than 30 percent from the middle of a first rectifying tower (5) under certain conditions; recovering materials of which light components are removed by the first rectifying tower at the bottom of the tower; adding from the middle of a second rectifying tower (10), and obtaining the naphthalene with the purity of not less than 95 percent on the top of the tower; adding the materials of which the naphthalene is removed at the bottom of the second rectifying tower from the middle of a third rectifying tower (15), and removing tetramethyl benzene and other components of which the boiling point is lower than that of the 2-methylnaphthalene at the top of the tower; recovering the materials of which the light fraction is removed by the third rectifying tower at the bottom of the tower, adding from the middle of a fourth rectifying tower (20), and obtaining the 2-methylnaphthalene with the purity of not less than 98 percenton the top of the tower; and recovering the materials of which the 2-methylnaphthalene is removed by the fourth rectifying tower at the bottom of the tower, adding from the middle of a fifth rectifying tower (25), and obtaining the 1-methylnaphthalene with the purity of not less than 98 percent. By the method, wastewater and waste residue are not generated and extraction efficiency is high.

The invention discloses a preparation method of a waterborne polyurethane grouting material. The method is as follows: isocyanate, retarding agent and hydrophilic polyether polyol are mixed to react and obtain the finished product, wherein isocyanate is selected from diphenylmethane diisocyanate, liquefied diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate isophorone diisocyanate, dicyclohexylmethylmethane-4,4'-diisocyanate, hexamethylene diisocyanate and polymethylene polyphenyl isocyanate or the mixture of toluene diisocynate and the isocyanates; and the degree of functionality of hydrophilic polyether polyol is 2-6, the ratio of ethylene oxide to propylene oxide is 99 / 1-60 / 40 and the molecular weight is 1000-20000. The invention also relates to the hydrophilic polyurethane grouting material prepared by the method. The preparation method of the invention is simple and convenient and has wide raw material sources; the prepared hydrophilic polyurethane grouting materialdoes not contain organic solvent, thus avoiding the damage on the health of the constructor and promoting environmental protection; and the grouting material can have lower viscosity and good permeability and waterproof and leaking stoppage effect.

Polymer compositions comprise a (i) silane-functionalized polymer, e.g., a polyethylene grafted with vinyl triethoxy silane, (H) polyfunctional alcohol e.g., α,α,α′,α′˜tetramethyl-I,3-benzenediethanol and, optionally, (iii) acid, e.g., an alkylated aryl disulfonic acid. The use of polyfunctional alcohols in the absence of a strong acid yields a light-crosslinking of the silane-functionalized polymer and this, in turn, provides a polymer melt with improved extensional properties such as elongational viscosity and melt strength. The use of a polyfunctional alcohol in combination with a blocked strong acid provides a slow rate of crosslinking during melt processing and a high degree of ultimate crosslinking after the polymer composition has been shaped or molded.

The invention relates to a method for preparing nonlinear optical metal-organic boron polymer crystal material, and belongs to the chemical industry technical field. Firstly, ligand H3L, namely, tri-(4-pyridine-2,3,5,6-tetramethylbenzene) borane is synthesized, then second order nonlinear optical metal-organic boron polymer crystal material with equal chirality is prepared, namely, ligand H3L andmetal cadmium salt are mixed according to 2: 1 mole ratio, the mixed solvent of ethyl alcohol and toluene is added, the reaction liquid is positioned into a sample bottle for reaction, and the crystal is taken out, washed and air dried after the reaction is finished, to obtain the second order nonlinear optical metal-organic boron polymer crystal material. The structural general formula is [MX2L].2H2O, wherein, MX2 represents CdCl2, Br2, I2, (NO3)2, (OAc)2, or (ClO4)2. Compared with the prior art, not only the reaction time of the invention is short, and the condition is temperate, but also both the purity and the production rate of the obtained crystal material are high.

The invention relates to modification of rubber materials, in particular to nitrated butadiene-acrylonitrile rubber as well as a preparation method and application thereof. The preparation method comprises the following step that nitration reaction is carried out on butadiene-acrylonitrile rubber by taking AgNO2 as a nitration agent so as to obtain the nitrated butadiene-acrylonitrile rubber, wherein in the nitration reaction, one of TEMPO, DPPH or p-benzoquinone and tetramethyl-benzoquinone serves as a catalyst. According to the nitrated butadiene-acrylonitrile rubber as well as the preparation method and application thereof, the butadiene-acrylonitrile rubber is nitrated by adopting the AgNO2 as the nitration reagent, the epoxidation step can be avoided, the nitrated butadiene-acrylonitrile rubber is obtained in one step, no gel is generated in the reaction process, the reaction time is short, the process is simple, and the operation is convenient; the liquid butadiene-acrylonitrilerubber is changed into an energetic bonding material from a common liquid rubber material, and the nitro group-containing nitrated liquid butadiene-acrylonitrile rubber; and meanwhile, a certain amount of nitro groups are introduced into molecular chains of conventional hydrogenated butadiene-acrylonitrile rubber to serve as active reactive groups, and a new research idea is provided for further modification.

The invention relates to a tetra(0-methyl-phenylphosphinyl)glycoluril (TMPG) flame retardant composition. The flame retardant composition is prepared from TMPG and any one or two or three of melamine cyanurate (MCA), melamine polyphosphate (MPP) and diethyl aluminum phosphinate (1240) through compounding according to any weight ratio and uniformly mixing, wherein the weight fraction of TMPG in the flame retardant composition is greater than 0. The flame retardant composition disclosed by the invention has the advantages that multiple elements are synergic, the material compatibility is good, the flame retardance is high, the flame retardant composition is halogen-free and environment-friendly, the application cost can be reduced and the like, so that the flame retardant composition can be applied to flame retardants of polyester, polyamide and the like.

Co-polyimide membranes for separating components of sour natural gas where embodiments can include at least three distinct moieties polymerized together, the moieties including a 2,2′-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) based moiety; a 9,9-bis(4-aminophenyl) fluorene (CARDO) based moiety; and 2,3,5,6-tetramethyl-1,4-phenylenediamine (durene diamine) based moiety.

The invention relates to a preparation method for nonlinear optical metal-organic boron polymer crystal material provided with equal chirality. The method adopts the steps that firstly, ligand H3L, namely tri-(4-para benzoic acid-2, 3, 5, 6-tetramethylbenzene) borane is synthesized, and then nonlinear optical metal-organic boron polymer crystal material with equal chirality is prepared, namely, ligand H3L and metal salt are mixed according to 1: 2, and dissolved by using N, N-dimethyl acetamide and methyl alcohol, the reaction liquid is positioned into a sample bottle for reaction, after the reaction is finished, the sample bottle is cooled to room temperature, the generated metal-organic polymeric material is taken out, and washed with ether for multiple times and air dried to obtain thematerial. The structural general formula is <M2L (OH) (MeOH)>.3H2O, wherein, metal M represents cobalt, manganese, nickel, copper, zinc or cadmium. The material produced through the invention has verygood second order nonlinear optical property, and compared with KDP, and the generation effect of second harmonics is 1.5 times higher.

The invention provides an environmentally sensitive material based on Benzofuroxan as well as a preparation method and an application thereof. The environmentally sensitive material has a structural formula as shown in the specification, wherein R1 is selected from one out of 1,4-dimethyl pyridine or 1,2,3,3-methylindole or 1,1,2,3-tetramethyl benzoindoles; functional transformation is further performed on a dye so as to derive a dye intermediate containing carboxyl; and recognition groups of different proteins are combined with an environmentally sensitive material by carboxyl so as to prepare a probe for detecting intra-cellular o-bithiol protein and an application of the probe in detecting o-bithiol protein and bioimaging. Fluorescence is greatly enhanced when the probe molecule prepared by using the environmentally sensitive material based on Benzofuroxan disclosed by the invention is combined with o-bithiol protein, thus easily realizing visualization of receptor proteins, increasing the signal-to-voice ratio, avoiding the tedious washing step and greatly saving time.

The invention relates to the field of plastics, and particularly discloses creep-resistant polypropylene, a preparation method thereof and a plastic tray. The creep-resistant polypropylene is prepared from, by weight, 45 to 76 parts of polypropylene, 3 to 8 parts of maleic anhydride, 1 to 4 parts of an initiator, 0.8 to 2 parts of polytetrafluoroethylene particles, 0.02 to 0.2 part of 2, 2, 6, 6-tetramethyl-1-(1-phenyl ethyoxyl) piperidine, 11 to 23 parts of glass fibers, 1 to 3 parts of a dispersing agent and 13 to 21 parts of a creep-resistant modifier. The creep-resistant modifier is composed of barium sulfate, carbonate and carbon black according to the weight ratio of (1-3): (4-7): (2-3). The preparation method of the creep-resistant polypropylene comprises the following steps: (1) mixing and soaking polypropylene, maleic anhydride and the initiator to obtain a polypropylene system; (2) adding water into the polypropylene system, and performing a grafting reaction to obtain grafted polypropylene; and (3) mixing the raw materials, and extruding to obtain the creep-resistant polypropylene. The creep-resistant polypropylene can be used for manufacturing plastic trays and has the advantage of good creep resistance.