4results about How to "Adequate mass transfer" patented technology

The utility model belongs to the technical field of waste gas treatment, and particularly relates to treatment equipment for rectifying VOCs (volatile organic compounds) organic waste gas, which comprises an anti-blocking mechanism and is characterized in that the anti-blocking mechanism comprises a plurality of spraying and absorbing inner cavities, and a plurality of fixing plates in an annular array are fixedly connected to opposite surfaces of the spraying and absorbing inner cavities; the anti-blocking mechanism is matched with the transmission mechanism, so that the problem of impurity accumulation of the anti-blocking sieve plate can be solved, and pollutants are combined with waste gas absorption liquid in the process of spraying rectified VOCs organic waste gas by the spraying pipeline; according to the anti-blocking device, the anti-blocking plate is arranged, so that viscous impurities such as high-boiling-point organic matters and polymers and scaling substances such as salt crystals in waste gas enable insoluble substances to be easily adhered and easily and gradually accumulated on the surface of the anti-blocking plate, normal contact and mass transfer of gas and liquid on the anti-blocking plate can be hindered due to the impurities, and the absorption efficiency is reduced; and the cleaning brush bristles capable of circularly moving can regularly clean the surface of the anti-blocking plate, so that the problem that impurities are accumulated on the surface of the tower plate is effectively solved.

The invention discloses a chlorhexidine gluconate solution and a preparation method thereof. The method comprises the following steps: dispersing chlorhexidine free alkali in purified water, introducing carbon dioxide, pressurizing and carbonizing, and constructing a homogeneous or quasi-homogeneous reaction system; adding gluconic acid-delta-lactone under the condition that the system pressure is not lower than 0.30 MPa, maintaining the pressure, carrying out constant-pressure stirring reaction, and inhibiting carbonic acid decomposition by utilizing back pressure so as to match lactone hydrolysis kinetics; and after the reaction is finished, carrying out gradient pressure relief, vacuum degassing and filtering. According to the present invention, the gas-liquid-solid three-phase coupling and the variable pressure-pressure maintaining delayed release process are adopted, such that the low-temperature total synthesis of chlorhexidine is achieved, the generation of parachloroaniline impurities and the discoloration of the product caused by the high temperature are effectively avoided, and the technical problems of incomplete reaction and easy muddy reaction at the low temperature are solved. The process has the advantages of no residue, high product purity and good safety.

The application relates to a high-concentration wastewater treatment device and method containing free ammonia and ammonium salt, and relates to the technical field of wastewater treatment. The method comprises the following steps: feeding wastewater into an MVR evaporation crystallization system for preheating, feeding the preheated wastewater into a forced circulation heater for heating to obtain a feed liquid with high solid content, and feeding the feed liquid with qualified solid content into a crystallizer for crystallization; feeding ammonia-containing condensate water into the top of a rectifying tower, performing vapor-liquid exchange heat transfer on the ammonia-containing condensate water in the rectifying tower; rectifying the ammonia-containing condensate water, and discharging the feed liquid in the rectifying tower through a kettle liquid pump when the ammonia content of the ammonia-containing condensate water is less than a certain value. When the feed liquid in the rectifying tower is discharged, only a trace amount of ammonia is contained, and the ammonia-containing condensate water is less harmful when recycled.

The application discloses a kind of microreactor for carbon dioxide conversion in air, including reaction cavity, and reaction cavity shell is made of light transmission glass;Multiple sets of catalyst carrier assemblies are equipped in reaction cavity cavity, along material flow direction, adjacent catalyst carrier assemblies are staggered in turn and form baffle passage;Each set of catalyst carrier assembly is composed of transversely arranged catalyst carrier and longitudinally arranged catalyst carrier;Catalyst carrier is foam ceramic carrier, and catalyst is loaded on carrier, and foam ceramic carrier is porous structure.The application limits reactor, can realize CO2 on foam ceramic carrier in reactor inside sufficient mass transfer and heat transfer, and transversely and longitudinally arranged carrier can increase the residence time of CO2 in foam ceramic pore, and transversely and longitudinally arranged carrier can expose more active sites of catalyst, so that the catalytic efficiency of entire reaction is improved, realizes CO2 100% conversion rate, and also can realize 100% conversion of CO2 in air.