Abstract:
The invention relates to a method for reducing the content of small quantities of C1-C2-aldehydes formed from organic compounds with -CH2-CHR-O- and/or -CH2-CH(OH)-groups (R=H, C1-C4-alkyl) as a result of radical action, to
Abstract:
A method for preparing 1,2-propanediol by the steps of (a) continuously reacting propene with hydrogen peroxide in the presence of a catalyst mixture comprising a quaternary ammonium salt and a polytungstophosphate in a liquid reaction mixture comprising an aqueous phase with a maximum apparent pH of 6 and an organic phase comprising an alkylaromatic hydrocarbon solvent, (b) withdrawing liquid reaction mixture from step a) and adding a water-soluble sulfate salt or sulfuric acid to provide a mixture comprising from 500 to 10,000 mg/kg of sulfate ions in the aqueous phase, (c) separating the mixture obtained in step b) into an aqueous phase (Pa) comprising 1,2-propanediol and an organic phase (Po), (d) recycling at least a part of the organic phase (Po) to the reaction step a) and (e) recovering 1,2-propanediol from the aqueous phase (Pa) allows extended operation of the reaction with little loss of tungsten and phase transfer catalyst.
Abstract:
본 발명은 할로겐이 치환된 벤조산으로부터 할로겐이 치환된 벤질 알코올의 제조방법에 관한 것이다. 본 발명의 방법을 이용하여 할로겐이 치환된 벤질 알코올을 제조하는 경우, 수소화붕소나트륨과 저가의 무기산을 사용하므로, 특수 반응기를 사용하지 않고도 벤질 알코올을 제조하는 것이 가능하여, 제조공정이 편리하고, 산업 폐기물이 감소되며, 고수율 및 고순도의 벤질 알코올을 제조할 수 있어, 제초제 및 간전제 합성의 원료로서 유용한 벤질 알코올의 대량생산에 용이하다.
Abstract:
A composition having: titania aerogel having titania nanoparticles and copper nanoparticles. Each of the copper nanoparticles is in contact with more than one of the titania nanoparticles. A method of: providing a titania aerogel, and forming or depositing copper nanoparticles onto the surface of the titania aerogel.
Abstract:
The present invention relates to a method of regenerating a catalyst and a method for producing alkylene carbonate and/or alkylene glycol which can be used by regenerating a deactivated catalyst. The method of regenerating a catalyst comprises the steps of: concentrating, through the use of a thin film evaporation apparatus, a resultant product obtained by the reaction between alkylene oxide and carbon dioxide in the presence of a catalyst of a quaternary phosphonium iodide compound and/or quaternary phosphonium bromide compound; and allowing the concentrate to react with an iodine salt and/or bromine salt.
Abstract:
본 발명은, 4차 포스포늄 요오드 화합물 및/또는 4차 포스포늄 브롬 화합물의 촉매 존재 하에, 알킬렌 옥사이드와 이산화탄소를 반응시켜 얻어진 결과물을, 박막 증발 장치를 이용하여 농축하는 단계; 및 상기 농축물을 요오드화 염 및/또는 브롬화 염과 반응시키는 단계;를 포함하는 촉매의 재생 방법 및 활성이 떨어진 촉매를 재생하여 사용할 수 있는 알킬렌 카보네이트 및/또는 알킬렌 글리콜의 제조 방법에 관한 것이다.
Abstract:
A catalytic process for generating at least one polyol from a feedstock comprising cellulose is performed in a continuous manner using a catalyst comprising nickel tungsten carbide. The process involves, contacting, continuously, hydrogen, water, and a feedstock comprising cellulose, with the catalyst to generate an effluent stream comprising at least one polyol and recovering the polyol from the effluent stream.
Abstract:
A process for generating at least one polyol from a feedstock comprising saccharide is performed in a continuous or batch manner using a catalyst system. The process involves, contacting hydrogen, water, and a feedstock comprising saccharide, with a catalyst system to generate an effluent stream comprising at least one polyol and recovering the polyol from the effluent stream. The catalyst system comprises at least one metal component with an oxidation state greater than or equal to 2+.
Abstract:
A catalytic process for generating at least one polyol from a feedstock comprising cellulose is performed in a continuous manner. The process involves, contacting, continuously, hydrogen, water, and a feedstock comprising cellulose, with a catalyst to generate an effluent stream comprising at least one polyol, water, hydrogen, and at least one co-product. The water, hydrogen, and at least one co-product are separated from the effluent stream and recycled to the reaction zone. The polyol is recovered from the effluent stream.
Abstract:
A catalytic process for generating at least one polyol from a feedstock comprising cellulose is performed in a continuous manner. The process involves, contacting, continuously, hydrogen, water, and a feedstock comprising cellulose, with a catalyst to generate an effluent stream comprising at least one polyol, water, hydrogen, and at least one co-product. The water, hydrogen, and at least one co-product are separated from the effluent stream and recycled to the reaction zone. The polyol is recovered from the effluent stream.