706results about How to "Good reaction selectivity" patented technology

Disclosed is amultichannel reactor with microstructure. Continuous phase inlet pipe and distribution chamber, discontinuous phase inlet pipe and distribution chamber, mixture phase buffer chamber and fluid outlet pipe connects separately, and they compose the lower cavity. Porous distribution medium is sealed in the upper distribution chamber of discontinuous phase. A parallel channel plate of continuous phase is located above the lower cavity and the upper is sealed. The continuous phase liquid flows into the reactor from the distribution chamber of inlet pipe; the discontinuous liquid flows into the parallel channel of continuous phase following through the distribution medium, distributes into minute drop or air bubble with the floating shearing force of continuous phase liquid, and then connects with the continuous phase liquid to realize the rapid mixture and reaction of the two- phase liquid; then the liquid flows out of the reactor. With the invention, the area of mass transfer is big, the reaction conversion rate is high, and large scale production can be realized.

The invention discloses a method for preparing gamma-valerolactone by acetylpropionic acid catalytic hydrogenation. Through high efficiency catalysis of levulinic acid hydrogenation based on a loaded ruthenium catalyst under mild conditions, gamma-valerolactone is prepared. The method has a levulinic acid conversion rate of 100% and gamma-valerolactone selectivity of 99.9%. The loaded ruthenium catalyst has a low active metal load capacity (less than 1.5w.t.%) and high activity (TOF, 7676h<1>), has good water and acid resistance and is suitable for an intermittent reactor and a continuous fixed bed reactor. The method solves the problem that the existing gamma-valerolactone preparation method needs a high temperature and high pressure and utilizes organic acids and bases and an organic solvent, improves preparation method economy and safety, utilizes a small amount of a catalyst, realizes catalyst recycle, has a high product yield and product separation easiness, and has a latent industrial application value.

The present invention relates to a hydrogenation method for producing clean diesel oil, after the raw material oil is mixed with circulating hydrogen, the mixture enters into a second hydrogenating reactor area, under the action of hydrogenation refining catalyst, the reaction is performed, after the reaction effusion is cooled, separated and fractionated, naphtha distillate, light diesel oil distillate and heavy diesel oil distillate are got, after a part or whole heavy diesel oil distillate is mixed with new hydrogen, the mixture enters into a first hydrogenating reactor area, and contacts with the hydrogenating reforming catalyst to perform reaction, the reactant enters into the second hydrogenating reactor area directly without separation, the left heavy diesel oil distillate and the light diesel oil distillate are mixed to get the diesel oil product. The adoption method of the present invention can treat high sulpher, high nitrogen and high drying point diesel oil distillate, under the relaxer operation condition, 2 type and 3 type of standard clean diesel oil which meet the requirement of the World Fuel Oil Code can be got. The present invention has simple flow and low operation pressure, the investment for equipments and the operation cost are all comparatively lower.

The invention discloses a new method for preparing alkyl indicant, technically characterized in making ultramicro pulverization processing on anhydrous glucose or crystal water containing glucose, then reacting with C8-C20 high grade alcohol under the existence of organic sulphonic acid catalyst, vacuum dehydrating and obtaining alcohol solution of alkyl indicant, then neutralizing acdic catalyst with organic acid sodium or potassium salt, vacuum distilling to eliminate excessive high grade alcohol, using chelating agent or sodium silicate to screen Fe ions, Mn ions and other ions, using tetraacetyl ethylene diamine as oxydol activating agent, bleaching alkyl indicant solution, and finally using hydrogen peroxide enzyme to eliminate the residual hydrogen peroxide from the products. The advantages of the invention: the reaction temperature is low and the reacting time is short, the process is simple and convenient, the production cost is low, and the prepared alkyl indicant is colorless or approximately colorless, transparent, peculiar smell-free, and stable to store.

The invention discloses a method for preparing a quinoline derivative. The quinoline derivative serving as a goal product is prepared by cyclizing aniline or an aniline derivative with alpha, beta-unsaturated aldehyde and ketone in acidic ionic liquid under the catalysis of iodine or iodide. A synthesis method provided by the invention has the characteristics of high reaction selectivity, high yield, mild reaction conditions, environmental friendliness and the like, and is suitable for industrial production; a product is easy to separate; and the ionic liquid can be recycled.

The invention relates to a magnetic stabilization catalytic reforming device and a method. The device comprises a material medium mixing unit, a partial oxidation unit, a magnetizing unit, a heating electric resistance wire and a temperature preservation layer; the outermost layer is a coil; the middle layer of the reforming device is the temperature preservation layer; the inner layer of the reforming device is the heat electric resistance wire wrapped by insulation ceramics; a reforming medium and a to-be-reformed gas is introduced into a nozzle of the magnetic stabilization catalytic reforming device under normal pressure or band pressure at a high speed, and eddy current is formed behind a turbulent current device; gas enters the reforming device above; under the effect of a catalyst, a magnetic medium wrapping active substances form medium nets which are distributed uniformly and densely under the disturbance of a stable axial magnetic field; and the gas is in fully contact with a magnetic medium catalyst so as to react and generate gases such as H2, CO, CH4, CO2 as well as alkane. According to the invention, the magnetic medium replaces the catalyst prepared by a traditional carrier, the problem that the deactivation catalytic performance of the catalyst is lowered is solved through removing the oil tar and coke which are attached on the surface of the catalyst at high temperature, the service lives of the catalyst and the carrier are prolonged, and the catalytic performance is improved.