47 results about "ETO - Ethylene oxide" patented technology

The molybdenum vanadium tellurium niobium oxide catalyst used for preparing ethylene from ethane, its preparation method and application belong to the ethylene preparation technology of organic chemical industry. The elemental composition of the catalyst is Mo‑V‑Te‑Nb‑O, and the molar ratio of its active components is Mo:V:Te:Nb=1:0.2~1.0:0.2~1.0:0.1~0.5. The stainless steel reaction kettle is prepared by hydrothermal synthesis method, and special surfactant is added for adjustment during the preparation process, and the obtained catalyst is obtained by further roasting. When it is used in the ethane oxidation to ethylene reaction, the ethane conversion rate and ethylene selectivity can reach 70.5% and 95.0% respectively at 350 °C, and the ethylene yield can reach 67.0%, far exceeding the results reported in the literature.

The invention provides a preparation method of a silver catalyst, and the preparation method comprises the following steps: step A, dissolving ethylenediamine and ethanol in water; step B, under stirring, adding a silver containing compound to the solution, and before, meanwhile and after adding of the silver containing compound, dropping additive dimethylamine and / or diethylamine into the solution; step C, adding assistants containing alkali metals and alkaline earth metals into the silver amine solution to produce a dipping solution; step D, putting an alumina carrier in the dipping solution for dipping; and step E, separating a solid from the dipping solution, and thus obtaining the silver catalyst after thermal activation. In the preparation method, addition of the dimethylamine and the diethylamine can help to improve the activity and stability of the silver catalyst.

The invention relates to a method for synthesizing ethylene carbonate or propylene carbonate with carbon dioxide and ethylene oxide or propylene oxide. The method adopts continuous circulation reaction; 150g / h ethylene oxide or propylene oxide and 2-4Mpa of carbon dioxide are respectively added from the bottom of a reactor; the reaction pressure is 1.0-5.0Mpa, the reaction temperature is 100-200 DEG C, and the reaction time lasts for 1-5 hours; a catalyzer is compositive catalyzer formed by carbonate and alkyl imidazolium or fxanol ionic liquid; the catalyzer is 7.5g / h, and the weight ratio of the carbonate to the alkyl imidazolium or fxanol ionic liquid ammonia is 1: 6.5; and the carbonate is alkali carbonate or aldaline-earth metal carbonate. The invention has simple process, high activity of the catalyzer and less loss of the catalyzer, the percent conversion of epoxy ethane reaches 96-99 percent, and the selectivity is 97-99 percent.

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.

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.