69results about How to "Constant reaction temperature" patented technology

A process by which a hydroformylation reaction can be efficiently conducted without lowering the yield of an aldehyde in the reaction is provided. A process for producing an aldehyde which includes subjecting an olefin to a hydroformylation reaction with carbon monoxide and hydrogen in the presence of a catalyst, characterized in that the olefin is fed as a gas to a reactor. In feeding the olefin as a gas to the reactor, it is preferred to gasify the olefin with the heat of the hydroformylation reaction.

The invention relates to a continuous reaction process for preparing ε-caprolactone and microchannel reaction equipment, belonging to the technical field of organic synthesis. In this method, cyclohexanone is used as the initial reaction raw material, and peracetic acid produced by the reaction of hydrogen peroxide and acetic anhydride is used as the oxidant, and the processes of peroxyacid preparation and cyclohexanone oxidation are continuously completed in a microchannel reactor system. The process method of the present invention can effectively control the temperature of the reaction process, has high safety, does not need to add solvent, catalyst and stabilizer, is beneficial to the separation and purification of caprolactone, and makes it possible to continuously produce ε-caprolactone with high yield; The microchannel reaction equipment proposed by the present invention highly satisfies the requirements of the reaction process. The conversion rate of cyclohexanone in the invention reaches 50%-95%, and the selectivity of ε-caprolactone reaches 80%-100%.

The invention relates to a method for undergoing a chlorobenzene nitration reaction by using a micro-channel reactor, belonging to the technical field of application of organic synthesis. In the method, nitric acid, sulfuric acid, water and chlorobenzene are taken as initial reaction raw materials, and processes such as mixed acid preparation, mixed acid and chlorobenzene preheating, mixed acid and chlorobenzene reacting and the like are completed in a micro-channel reactor system. In the reaction, nitro-sulfuric mixed acid is taken as a nitrating agent, the effective concentration of sulfuric acid in the mixed acid is 50-90 percent, the molar ratio of the nitric acid to the sulfuric acid in the mixed acid is 1:1-1:10, the molar ratio of the chlorobenzene to the nitric acid is 1:1.0-1:2.0, the reaction temperature is 50-100 DEG C, and the reaction time is 30-120 seconds. The chlorobenzene transformation ratio is up to 97 percent, the selectivity of nitrochlorobenzene serving as a product is over 96.5 percent, and the ratio of ortho-para nitrochlorobenzene is over 0.6. A strengthened mixed micro-channel reactor adopted in the invention is particularly suitable for undergoing a continuous nitration reaction, and has the characteristics of stable temperature control and safe process.

An isothermal carbon monoxide (CO) shift reactor having high CO conversion and the process technology comprises the outside pressure vessel; the catalyst unit; tipper and lower tube sheets welded with water tubes and bottom tee joints; the said outside pressure vessel has seal heads at the upper and lower ends; the said vessel has a water chamber and a steam chamber at the upper section. The catalyst unit comprises the upper catalyst bed with water tubes. There is a central pipe that is located in the said vessel, of which the upper end is located in the upper catalyst bed while the lower end is located in the lower catalyst bed; the said bottom tee joint has an inlet for feed gas, outlet for reacted shift gas and inlet for steam-water mixture; the said central pipe is installed with spray nozzle for steam-water mixture; the said reactor is applicable for process technologies for feed and effluent gas having different CO contents. Low temperature, high CO feed content, high shift conversion and low system pressure drop are direct results of this disclosure.

The invention provides a novel sample preparation system for carbon and oxygen isotopes of carbonate and a sample preparation method thereof. The sample preparation system comprises an original sample reaction device, a finished sample extraction device and a system vacuum degree controlling device, wherein the original sample reaction device is connected with an autoinjection device. The sample preparation system employs the autoinjection device, so the automation degree of the sample preparation system is increased, and it is guaranteed that all the saturated phosphoric acid solution enters the bottom of a reaction tube and participates in a reaction; a touch button type vacuum valve is used to replace a conventional turn button type vacuum valve, so service life is prolonged, simplicity of usage of devices is improved, and operation time is shortened in preparation; and a constant temperature water-bath is added, vacuum-pumping and reaction can be completed in the devices in the same time, so a transfer step between vacuum-pumping and sample reaction is reduced. Moreover, the invention provides the sample preparation method of the novel sample preparation system. According to the invention, accuracy and the automation degree in preparation of a test sample are effectively improved, and standardized operational process is formed.