4results about How to "Process economy" patented technology

The utility model discloses an efficient heat dissipation switching power supply with an internal and external circulation isolation air duct, which comprises an outer shell, an inner shell, a PCBA (Printed Circuit Board Assembly) power board, a magnetic device, a heat dissipation aluminum frame, a power MOS (Metal Oxide Semiconductor) tube, an internal circulation fan, an external circulation fan and a waterproof joint, the PCBA power board forms an inner circulation air channel with the gap between the PCBA power board and the lower end wall of the first radiator and the gap between the PCBA power board and the upper end wall of the lower sealing plate, the other end wall of the outer shell is provided with a plurality of air outlet holes, and the air inlet, the gap between every two adjacent cooling fins and the air outlet holes form an outer circulation air channel. According to the utility model, the internal circulation air channel and the external circulation air channel can be isolated from each other independently, heat of the power device can be uniformly, efficiently and rapidly dissipated to the external environment, large-scale automatic production can be realized, and the heat dissipation efficiency can reach the effect of traditional air cooling; and internal components of the power supply module are completely isolated from external air and dust, so that the service life of the switching power supply is greatly prolonged.

The invention provides a reactor comprising a reaction chamber having a catalytic surface in contact with reactants in said chamber; and a source for passing electrical current through said catalytic surface. The reactor can be used for dehydrohalogentation reactions, such as dehydrochlorination of HCFC-244bb to HFO-1234yf, and for reactions where zero valent metals are employed for catalysis. The invention further provides a process to prepare HFO-1234yf from HCFC-244bb using an electrically heated reaction chamber.

The invention provides a method for activating an alkane C (sp3)-H bond through photocatalysis and constructing a C-C bond with aza-aromatic hydrocarbon. The method comprises the following steps: adding an aza-aromatic compound, an alkyl compound and acid into a solvent to obtain a solution A; and irradiating the solution A with visible light in an oxygen-containing atmosphere to obtain the photocatalyst. According to the method, the C (sp3)-H bond of the alkyl compound is successfully activated by utilizing a photochemical method under the condition of no introduction of a metal catalyst, a photocatalyst and a strong oxidant, the C-C bond construction of the alkyl compound and the aza-aromatic hydrocarbon compound is realized, the whole process is simple and efficient, the reaction conditions are mild, the preparation way of the alkyl-substituted aza-aromatic hydrocarbon compound is expanded, and the method is suitable for industrial production. The method is very favorable for popularizing the synthetic route of the coupling reaction of the alkane C (sp3)-H bond and aza-aromatic hydrocarbon.

The invention provides a reactor comprising a reaction chamber having a catalytic surface in contact with reactants in said chamber; and a source for passing electrical current through said catalytic surface. The reactor can be used for dehydrohalogentation reactions, such as dehydrochlorination of HCFC-244bb to HFO-1234yf, and for reactions where zero valent metals are employed for catalysis. The invention further provides a process to prepare HFO-1234yf from HCFC-244bb using an electrically heated reaction chamber.