46 results about "ETO - Ethylene oxide" patented technology

The present invention discloses a recycling method of ethylene oxide-containing organic waste gas. The specific technical scheme comprises that: ethylene oxide in ethylene oxide-containing organic waste gas is subjected to circulation absorbing in a hydrolysis tower by using dilute sulfuric acid with a certain concentration as an absorbent so as to produce a hydration reaction to generate ethylene glycol, the ethylene glycol is conveyed into an ethylene glycol solution storage tank after the ethylene glycol in the solution achieves a certain concentration, a sodium hydroxide solution is added to neutralize, one part of the neutralized ethylene glycol solution is used for the acid gas washing process, the other part is conveyed to the product separation and recovery, the tail gas discharged from the hydrolysis tower enters a reactor to carry out deep oxidation, an acid gas washing treatment is performed, the treated standard tail gas is discharged into the atmosphere, and the absorbing liquid is recycled to the ethylene glycol solution storage tank. According to the present invention, the method has characteristics of short process and simple operation, and with the treatment of the present invention, the ethylene oxide content in the organic waste gas tail gas does not exceed 1 ppm, and a certain amount of the ethylene glycol solution is recovered so as to achieve the resource utilization of the waste gas.

The invention relates to a treatment method of waste gas containing ethylene oxide and propylene oxide, mainly solving the problems in the prior art that the consumption of washing water is great and wastewater obtained by washing is difficult to treat. By adopting the treatment method of the waste gas containing ethylene oxide and propylene oxide, provided by the invention, the waste gas enters a waste gas absorption tower and is in contact with washing water to be washed; washed waste gas is discharged into the atmosphere from the top of the waste gas absorption tower; washing rich liquid at the bottom of the waste gas absorption tower passes through a waste water pump and then enters a wastewater pre-heater and a secondary pre-heater in sequence, and then enters a hydration reactor to be subjected to a catalytic hydration reaction; after ethylene oxide and propylene oxide in the hydration reactor are subjected to catalytic conversion reaction, the wastewater is conveyed into the wastewater pre-heater and is used as a heat source for pre-heating the washing rich liquid; and at least one part of the wastewater is treated by a lithium bromide freezer and then the treated wastewater is used as the washing water and enters the waste gas absorption tower. By adopting the technical scheme, the problems are solved very well; and the treatment method can be used for treating the waste gas containing ethylene oxide and propylene oxide.

A supported silver catalyst and use thereof in a process for producing an alkylene oxide, such as ethylene oxide, by the direct oxidation of an alkylene with oxygen or an oxygen-containing gas, wherein the catalyst provides improved stability and improved resilience to reactor upsets and timely recovery to substantially pre-upset levels of catalyst activity and/or efficiency. In some embodiments, the catalyst also exhibits improved activity. A catalyst capable of producing ethylene oxide at a selectivity of at least 87 percent while achieving a work rate of at least 184 kg/h/m³ at a temperature of no greater than 235° C. when operated in a process where the inlet feed to a reactor containing the catalyst comprises ethylene, oxygen, and carbon dioxide, wherein the concentration of carbon dioxide in the inlet feed is greater than or equal to 2 mole percent.

The invention discloses an ethylene oxide sterilization process, comprising the following steps: 1) anti-explosion pretreatment; 2) sterilization treatment: first filling a sterilization cabinet withgaseous ethylene oxide, and then filling nitrogen gas into the sterilization cabinet, while turning on the gas circulation system of the sterilization cabinet, so that the gas in the cabinet is uniformly distributed, and a to-be-sterilized product stands in the sterilization cabinet for 5-8 hours continuously; 3) sterilization post-treatment. In the above manner, the pre-explosion treatment is adopted to replace the oxygen gas in the sterilization cabinet to ensure that the ethylene oxide gas is out of an explosion limit; in the sterilization process, the gaseous ethylene oxide is filled withnitrogen gas and gas flows in a circulation manner via the gas circulation system, so that ethylene oxide can penetrate into a product better to improve sterilization effect; after sterilization, nitrogen cleaning and air cleaning are performed to remove the ethylene oxide gas in the cabinet, to avoid gas volatilization to affect the health of operators or an explosion caused by oxygen gas contactwith naked light during opening of the cabinet, capable of significantly improving the safety of sterilization of ethylene oxide.

The invention relates to a method for catalytically synthesizing 3-hydroxylpropionitrile from hydrocyanic acid and epoxyethane. An activated alumina immobilized boron trifluoride and 1,2-pentanediol complex is used for catalyzing a reaction between hydrocyanic acid and epoxyethane so as to synthesize 3-hydroxylpropionitrile. By the method, during the reaction, a reaction mixture is not required to be neutralized with a large volume of acid, and the generation of a large amount of inorganic salts is absent, so that the reaction has the atom economy of 100%; the reaction route is short, the number of operating steps is small, and the product separation is easy, so that the reaction is simple and convenient in operation; and hydrocyanic acid in a system is free of risk of numerous overflowing under the condition of low-temperature reaction, so that the reaction is safe in operation.

Disclosed is a catalyst for ethylene oxide production which is used for producing ethylene oxide from ethylene. This catalyst is composed of at least silver (Ag), caesium (Cs), rhenium (Re) and a carrier, and improved especially in selectivity. Specifically disclosed is a catalyst for ethylene oxide production, which is used for producing ethylene oxide from ethylene and composed of at least silver (Ag), caesium (Cs), rhenium (Re) and a carrier. If necessary, an alkali metal is loaded onto the carrier as a pretreatment, and then Ag, Cs and Re are loaded onto the carrier, thereby obtaining the catalyst. The carrier has a specific surface area of 0.6-3.0 m2/g, and a weight ratio between the silicon (Si) content and the sodium (Na) content in terms of SiO2/Na2O of 2-50. The Re content (based on the carrier) is 170-600 ppm per 1 m2/g of the specific surface area of the carrier, and the molar ratio Cs/Re is 0.3-19.

Ethylene oxide purification method. The invention relates to a separation method of ethylene oxide, which mainly solves the problems of high energy consumption, low ethylene oxide absorption rate andlow removal rate in the prior art. The invention aims at the low-concentration ethylene oxide product at the outlet of an ethylene oxide reactor, and the low-concentration ethylene oxide is separatedand enriched by adopting a mixed absorbent of an ionic liquid with anion as hexafluorophosphate radical and triethylene glycol dimethyl ether. Compared with the traditional process using water or ethylene carbonate as absorbent, the process flow is simplified, the separation efficiency is higher, and the process has industrial application potential.

The invention relates to a tin-containing molecular sieve catalyst used for preparing ethylene glycol by hydrating ethylene oxide and an application method of the tin-containing molecular sieve catalyst. The tin-containing molecular sieve catalyst is prepared by taking H-SSZ-13 zeolite molecular sieve raw powder as a raw material, carrying out water steam treatment or water steam and acid combined treatment on the raw material, and introducing active central metal in a manner of roasting by a vacuum pipe type furnace. The preparation method comprises the following steps: mixing an H-SSZ-13 zeolite molecular sieve treated by the water steam or acid with an organic metal compound precursor at a ratio and roasting in vacuum. According to the tin-containing molecular sieve catalyst, the problems of high water ratio, high energy consumption, environmental pollution caused in a production process and the like in a traditional process can be solved. According to the catalyst, a carrier is cheap and easy to obtain, a preparation process of the catalyst is simple and the stability of the catalyst is good; and the catalyst has excellent catalyzing activity and selectivity when being applied to a process of preparing ethylene glycol by directly hydrating ethylene oxide under a warm condition, is easy to recycle and can be used for industrial production for preparing ethylene glycol by hydrating ethylene oxide.

The present invention relates to a process for preparing ethylene oxide by reaction of ethylene with oxygen in the presence of at least one silver-comprising catalyst, wherein the reaction takes place in a reactor which has a catalyst packed bed having at least two zones (i) and (ii) and the silver content of the catalyst in zone (i) is lower than the silver content of the catalyst in zone (ii). The catalyst packed bed preferably has a further zone (a) with which the reaction mixture comes into contact before the zones (i) and (ii). According to the invention, the silver content of the catalyst in the zone (a) is higher than the silver content of the catalyst in zone (i).

The invention belongs to the field of catalysts, and provides a silver impregnation liquid for ethylene oxide production through ethylene epoxidation, a silver catalyst and preparation methods thereof. The silver impregnation liquid for ethylene oxide production through ethylene epoxidation comprises the following components: 1) a silver-ammonia complex; 2) polar amino acid; 3) water; 4) an optional auxiliary agent; wherein based on the total weight of the impregnation liquid, the content of the polar amino acid is 0.05-60 wt%. Compared with the prior art, the uniformity of the silver catalystprepared by the method provided by the invention is improved, and the silver catalyst has higher selectivity and higher catalytic activity for the reaction of producing ethylene oxide by ethylene oxidation.

The invention relates to a nano-sensitive material for detecting ethylene oxide. The nano-sensitive material is characterized by consisting of Ag atom-doped Al2O3, V2O5 and BaO nano-powder, wherein the Ag atom-doped Al2O3, V2O5 and BaO nano-powder comprises the following components: 6 to 9 percent of Ag, 25 to 35 percent of Al2O3, 35 to 45 percent of V2O5 and 10 to 25 percent of BaO; and the particle size range is 35 to 50nm. An ethylene oxide sensor which is prepared from the sensitive material has the advantages of wide linear range, high selectivity and sensitivity and the like, can monitor a trace amount of ethylene oxide on line, and is not affected by coexisting substances.

The invention relates to a catalyst for preparing ethylene carbonate from ethylene oxide and carbon dioxide, and a preparation method thereof to mainly solve the problem of low activity of heterogeneous catalysts in the prior art. The catalyst comprises a main catalyst and a cocatalyst; the main catalyst is a metal mixed oxide AaOb/BcOd, wherein A is selected from at least one of Cu, Mg, Zn, Ca, Co or Ni, and B is selected from at least one of Al, Fe, Cr or Zr; the cocatalyst is a quaternary ammonium salt R1R2R3R4N<+>X<->; and a weight ratio of the cocatalyst to the main catalyst is 0.1-10. The catalyst adopting the above technical scheme well solves the problem, and can be used in industrial production of ethylene carbonate.

The invention relates to a method for producing ethylene carbonate from ethylene oxide and CO2 and mainly solves the problem that heterogeneous catalysts have low activity in the prior art. The methodcomprises the step of contacting ethylene oxide and CO2 with a catalyst under the reaction condition, wherein the catalyst is a supported compound e metal oxide catalyst MO-TO2/SP; M is at least oneof alkaline earth metals Mg, Ca, Sr and Ba; T is at least one of Ti and Zr; SP is at least one of porous silicon oxide, SBA-15, MCM-41, MCF, HMS, aluminum oxide and activated carbon; the weight content of MO is 1%-20%, the weight content of TO2 is 5%-30% and the weight content of SP is 50%-94%. With the adoption of the technical scheme, the problem is better solved and the method can be applied toindustrial production of preparation of ethylene carbonate from ethylene oxide and CO2.

The invention relates to a method for preparing ethylene carbonate from ethylene oxide and carbon dioxide, which mainly solves the problems of low catalyst activity and high probability of loss of active ingredients existing in the prior art. In the method, the ethylene oxide and the carbon dioxide are utilized as raw materials; the reaction raw materials are contacted with a catalyst to generatethe ethylene carbonate under the conditions of reaction temperature of 50-200 DEG C, reaction pressure of 0.1-10.0MPa and mass ratio of the catalyst to the ethylene carbonate of 0.001-1:1; and in thecatalyst, SiO2 microspheres with average diameter of 15-500nm are used as a nuclear phase, and metal salt MYn complexed by polyethyleneimine is used as a shell phase, wherein M is Ni, Zn, Cu, Fe or Co; Y is Cl, Br or I; and n is 2 or 3. The periphery of the nuclear-phase nano SiO2 spheres is wrapped by a metal salt shell layer complexed by the polyethyleneimine; the thickness of the shell layer is 0.5-8nm; and the weight ratio of the nuclear phase to the shell phase is 45/55-99.5/0.5. Due to the technical scheme, the problem is solved better; and the method can be used for industrial production of the ethylene carbonate from the ethylene oxide and the carbon dioxide.

The invention provides a method for producing ethylene oxide. The method comprises the following steps that charging gas mixture is reacted under existence of a silver catalyst to generate a reaction product containing ethylene oxide; wherein, the charging gas mixture contains ethane, oxygen and a mixing nitrogen oxide, the mixing nitrogen oxide contains two or more components from nitric oxide, nitrogen dioxide and nitrous oxide; and the content of rhenium element in the silver catalyst is equal to or smaller than 100 ppm. The invention provides the novel industrial method for producing ethylene oxide by using the silver catalyst containing rhenium with low rhenium content or containing no rhenium.

The invention relates to a method for preparing epoxyethane from oxygen and ethylene. The method is mainly used for solving the problem in the prior art that the safety is relatively poor. According to the method, through adopting the technical scheme that the method for preparing the epoxyethane from the oxygen and the ethylene comprises the steps that reactant ethylene gas is heated by a gas-gas heat exchanger and then enters at least one oxygen-transmission membrane tube in a reactor, the oxygen-transmission membrane tubes are made from mixed-conductor inorganic ceramic membranes and are of calandria arrangement, air enters an area, outside the oxygen-transmission membrane tubes, in the reactor, the oxygen is subjected to adsorption and desorption on surfaces of oxygen-transmission membranes and then enters the oxygen-transmission membrane tubes to be in contact with the ethylene, a reaction is carried out in the presence of a catalyst to produce a product containing the epoxyethane, the product flows out from outlets of the oxygen-transmission membrane tubes, passes through the gas-gas heat exchanger and then enters a downstream separating system, and remaining nitrogen-enriched air is discharged from the reactor, the problem is better solved, so that the method can be applied to the preparation of the epoxyethane.

A method for the production of ethylene oxide wherein the partial pressure of water vapor at the inlet of the reactor is at least about 8 kPa using a high purity carrier comprising alpha-alumina, a promoting amount of at least one Group IA metal, and a promoting amount of rhenium.

The invention relates to a catalyst and a method for preparing ethylene carbonate from ethylene oxide and carbon dioxide, and mainly solves the problem of low activity of heterogeneous catalysts in the prior art. The present invention comprises a main catalyst and a cocatalyst by using the catalyst; the main catalyst is a metal mixed oxide AaOb/BcOd; wherein, A is selected from at least one of Cu, Mg, Zn, Ca, Co or Ni; B At least one selected from Al, Fe, Cr or Zr; the cocatalyst is a quaternary phosphonium salt R1R2R3R4P+X-; the technical scheme that the weight ratio of the cocatalyst to the main catalyst is 0.1 to 10 solves this problem well , can be used in the industrial production of ethylene carbonate.