143 results about "Propene oxide" patented technology

The present invention relates to a method for purifying crude propylene oxide containing methanol and acetaldehyde by extractive distillation operated continuously, wherein an extraction solvent capable of reducing the volatility of methanol is used, and the crude propylene oxide is fed into a distillation column above the feed point of the crude propylene oxide A compound containing unsubstituted NH2 groups and capable of reacting with acetaldehyde is added to obtain purified propylene oxide containing less than 100 ppm methanol and less than 100 ppm acetaldehyde. The present invention also relates to a method for catalytic epoxidation of propylene comprising said purification step.

The invention relates to an unsaturated polyether monomer, a comb-like branched copolymer cement dispersant prepared by the monomer, and preparation methods of the monomer and the dispersant. The unsaturated polyether monomer has the general formula (I), wherein R1 is H or -CH3; X is a linking group selected from -CH2-, -CH2CH2-, -OCH2CH2-, -OCH2CH2CH2CH2-; AO is ethylene oxide group and / or propene oxide group; l, m and n are all repeating units of AO; and the sum of l, m and n is an natural number of 10 to 50. The dispersant has the following chemical structure (VI), wherein x, y and z represent mole percentages of three structural units in the copolymer, and the sum of x, y and z is 100%. Preferably, x is 10% to 50%, y is 40% to 80% and z is 0% to 30%. The preparation method of the dispersant is simple and does not need organic solvents or complex esterification. The dispersant is advantageous in low dosage, good dispersibility and small slump loss.

Urethane acrylates of the general Formula (I), corresponding salts, solvates or solvates of a salt thereof:wherein R1, R2, R3, R4 and R5 each independently represent a substituent selected from the group consisting of hydrogen, halogens, C1-6-alkyls, trifluoromethyl, C1-6-alkylthios, C1-6-alkylselenos, C1-6-alkyltelluros, and nitro groups, with the proviso that at least one of R1, R2, R3, R4 and R5 is not hydrogen; R6 and R7 each independently represent a substituent selected from the group consisting of hydrogen and C1-6-alkyls; and A represents a saturated or unsaturated or linear or branched C1-6-alkyl radical or a polyalkylene oxide radical having 2-6 ethylene oxide or propylene oxide units; processes for producing and methods of using the same.

The invention discloses a process for continuously producing epoxy propane through propylene and propane mixed gas directly oxidized by hydrogen peroxide. In the reaction process, a fluidized bed circulation flow reactor is adopted, and a fine particle molecular sieve catalyst is used. The process comprises the following steps: discharging slurry to pass trough a flash column, respectively flashing low-oxygen propylene / propane mixed gas and epoxy propane, separating catalyst slurry and mother solution in the catalyst-containing mother solution through a membrane separator, performing flash separation on methanol in the mother solution, synchronously recovering the reacted residual high-oxygen propylene / propane mixed gas for recycling in a high-oxygen propylene / propane absorption tower by utilizing a recovery solvent methanol, and regenerating an online part of the catalyst slurry to return to the reactor for recycling. According to the process, the stability and continuity of the process for producing the epoxy propane through propylene and propane mixed gas directly oxidized by hydrogen peroxide are realized.

The invention relates to a high-viscosity vibration attenuation polyurethane repairing material for sinking repairing of a polyurethane cured track bed of a high speed railway or a heavy haul railway. The high-viscosity vibration attenuation polyurethane repairing material consists of a component A and a component B which are mixed and stirred together mechanically, wherein the mass ratio of the component A to the component B is (1:0.9)-(1:1.5); the component A is a mixture of an HDI tripolymer and polymethylene polyphenyl isocyanate ester; the mass ratio of the HDI tripolymer to polymethylene polyphenyl isocyanate ester is (3:7)-(6:4); the content of -NCO is 27-29%; and the component B consists of polyhydric alcohol, a catalyst, a defoaming agent, a moisture scavenger, an anti-aging agent, a flame retardant and rubber granules. The high-viscosity vibration attenuation polyurethane repairing material is characterized in that the polyhydric alcohol is a mixture which consists of 6-functionality-degree mannitol poly(propylene oxide polyol) and 3-functionality-degree high molecular weight polyether polyol with the molecular weight of 12000. According to the polyurethane repairing material provided by the invention, the volume expansion ratio is 1-3%, the compressive strength of 1 hour is greater than or equal to 12MPa, the adhesion strength is greater than or equal to 6MPa, the damping factor is 0.25-0.40, the accumulated residual deformation is less than or equal to 0.5% after 5 million times of fatigue loading, and the polyurethane repairing material can be applied to polyurethane cured track bed sinking repairing and railway ballast cured track bed sinking repairing as well.

An integrated process for making propene oxide and an alkyl tert-butyl ether comprises dehydrogenating a feed stream comprising iso-butane to provide a stream comprising iso-butene and hydrogen and separating this stream into a stream consisting essentially of hydrogen and a stream comprising iso-butene; reacting a part or all of the stream comprising iso-butene with an alkanol in the presence of a solid acid catalyst to provide an alkyl tert-butyl ether; reacting a part or all of the stream consisting essentially of hydrogen with oxygen, providing a stream comprising hydrogen peroxide; and reacting a part or all of the stream comprising hydrogen peroxide with propene in the presence of an epoxidation catalyst to provide propene oxide.

An integrated process for making propene oxide and an alkyl tert-butyl ether comprises dehydrogenating a feed stream comprising propane and iso-butane to provide a stream comprising propene, iso-butene and hydrogen; separating this stream into a stream consisting essentially of hydrogen and a stream comprising propene and iso-butene; separating the stream comprising propene and iso-butene into a stream comprising propene and a stream comprising iso-butene; reacting a part or all of the stream comprising iso-butene with an alkanol in the presence of a solid acid catalyst to provide an alkyl tert-butyl ether; and reacting a part or all of the stream comprising propene with hydrogen peroxide in the presence of an epoxidation catalyst to provide propene oxide.

A composite polyurethane elastomer / nano laminated material for stadium is prepared through preparing organic nano laminated material from montmorillonite and hydrotalcite, vacuum dewatering of dihydoxy polyoxyacrylether, mixing with toluene diisocyanate to obtain component A, compounding the organic nano laminated material with dihydroxy or trihydroxy polyoxyacrylether, mixing with 3,3'-bichloro-4,4'-diaminodiphenyl methane, pigment, filler and plasticizer to obtain component B, proportionally mixing components A with B, and laminating polymerization reaction u nder catalyst of zinc naphthenate. Its advantage is high flame-retording and mechanical performance.

The invention discloses a comb-shaped polymer, a comb-shaped polymer electrolyte material and a preparation method of the comb-shaped polymer electrolyte material. The comb-shaped polymer electrolyte material comprises a polymer matrix and a lithium salt. The polymer matrix is the comb-shaped polymer, and comprises a main chain repeating unit and a side chain repeating unit. The main chain repeating unit comprises a propylene oxide unit. The side chain repeating unit is a propylene oxide unit. In the invention, polypropylene oxide having excellent flexibility is introduced in the polymer matrix and a main chain is formed, and thus polymer chain segment motion is increased; polypropylene oxide chains having different length are introduced in side chains and the comb-shaped polymer is obtained, and thus solid electrolyte conductivity is improved; and through radiation crosslinking, electrolyte mechanical properties are improved.

A pyriproxyfen as insecticide is prepared from 4-hydroxydiphenyl ether, epoxy propane and 2-chloropyridine through dissolving 4-hydroxydiphenyl ether in alcohol, reacting on expoxy propane at 0-90 deg.C for 2-24 hr under existance of sodium hydroxide to obtain the intermediate, dissolving it in toluene, heating to 30-80 deg.C, slowly dropping 2-chloropyridine in it while reacting at 10-110 deg.C for 2-24 hr under existance of botassium hydroxide, distilling to remove toluene and refining.

A process of separating a purified propylene oxide from a crude epoxidation product produced, preferably, in an epoxidation reaction of propylene with hydrogen peroxide. The process involves removing bulk water, bulk methanol, and unreacted propylene from the crude epoxidation product and thereafter subjecting the resulting propylene oxide product to extractive distillation with water as an extraction solvent. Under distillation conditions, including a bottoms temperature of greater than about 55° C. and less than about 75° C., an overhead or side-cut distillate stream containing a purified propylene oxide is obtained with low yield loss of propylene oxide to propylene glycols and other glycol heavies. The purified propylene oxide can be further purified in a finishing distillation to obtain propylene oxide meeting commercial grade purity requirements.

The invention discloses polyurethane foam gum with expandable graphite and diatomite to cooperatively enhance flame retarding, which is prepared from, by weight, 150-160 parts of diphenyl methane diisocyanate, 100-105 parts of trihydroxy polyoxypropylene ether, 100-110 parts of castor oil, 5-6 parts of glycerol, 40-43 parts of diethyl phosphate, a proper amount of a 1 mol / L sodium hydroxide solution, 13-15 parts of diatomite, 5-6 parts of distilled water, 2-3 parts of triethanol amine, 3-4 parts of dibutyltin dilaurate, 3-4 parts of lauryl sodium sulfate, 5-6 parts of silicon oil, 3-4 parts of the expandable graphite, a proper amount of anhydrous ethanol, 0.8-1 part of cetyl trimethyl ammonium bromide, and a proper amount of deionized water. The foam gum is used for sealing switch cabinets and machine cabinets, is high in strength and is wear-resistant, can achieve on-site foaming and reduce production cost, has high total sealing performance, has simple and easy-to-control production process, and is safe and environment-friendly.

The disclosure relates to a process for separating propylene oxide for a crude propylene oxide stream, for example an intermediate stream from a PO / TBA process. The crude propylene oxide stream can be passed through an extractive distillation column. The distillation column is operated at a pressure in a range of greater than 25 up to 50 psig, and / or at a temperature in a range of from 70 to 150 degrees Celsius using C8-C20 paraffin as extractive solvent with an overhead distillate water wash drum. The crude propylene oxide stream include from 0.001 to 0.1 wt % methanol, based on the total composition of the crude propylene oxide stream. The systems, methods, and apparatuses can produce a propylene oxide stream having less formaldehyde and acetaldehyde than the prior art.