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46results about How to "Gentle production process" patented technology

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Catalyst for synthesizing acrylic acid by aqueous formaldehyde solution and acetic acid and preparation and application method of catalyst

ActiveCN103586067AProcess raw materials are cheapGentle production processMolecular sieve catalystsOrganic compound preparationActivated carbonMolecular sieve

The invention discloses a catalyst suitable for synthesizing acrylic acid by an aqueous formaldehyde solution and acetic acid and a preparation and application method of the catalyst. The catalyst is mainly characterized by adopting one or more of activated carbon, aluminum sesquioxide, silicon dioxide or molecular sieve as carriers, and loading phosphorus pentoxide and one or more alkaline-earth metal oxides, wherein phosphorus pentoxide accounts for 1%-20% of the total mass of the catalyst, and the alkaline-earth metal oxides account for 5%-30% of the total weight of the catalyst. The catalyst is prepared by the steps of impregnation, temperature programmed calcination and the like, and a vacuum-ultrasonic impregnation technique is introduced during the preparation process. According to the invention, a fixed bed reactor is adopted for produce acrylic acid continuously under the suitable reaction conditions, the conversion per pass of formaldehyde is up to 35%, and the selectivity of acrylic acid is up to 55%.

Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Method for preparing cyclic sulfate by directly oxidizing hydrogen peroxide

PendingCN111909129ALess impuritiesHigh purityOrganic chemistryMetal/metal-oxides/metal-hydroxide catalystsPtru catalystCatalytic oxidation

The method comprises the following steps: dropwise adding hydrogen peroxide into a mixture of cyclic sulfite, an organic solvent and a solid catalyst to carry out catalytic oxidation reaction, filtering out the solid catalyst after the reaction is finished, standing filtrate for layering, taking an organic layer, and performing distilling and concentrating to obtain a cyclic sulfate product. Cheaphydrogen peroxide is used for directly catalyzing and oxidizing cyclic sulfite to prepare cyclic sulfate, so that on one hand, the reaction is mild and easy to control, and the reaction conversion rate is high; on the other hand, no waste salt is generated, the evaporation capacity of water is small, energy consumption is low, generated waste water is little, and the production process is more environmentally friendly; the used solid catalyst contains an active component, an active auxiliary agent and an oxide carrier, and can be recycled, so that the consumption of noble metals is reduced, and the production cost is greatly reduced; the cyclic sulfate prepared by the method is few in impurities, high in purity and wide in market prospect.

46results about How to "Gentle production process" patented technology

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