112results about How to "Recycling" patented technology

The invention discloses a method for preparing an optically active carbonyl compound, which comprises the following step: under catalysis of a chiral amine salt and a transition metal catalyst, carrying out asymmetric catalytic hydrogenation reaction on alpha, beta-unsaturated aldehyde or alpha, beta-unsaturated ketone compound by taking hydrogen gas and a catalysis amount of dihydropyridine compound as a hydrogen source, so as to obtain the optically active carbonyl compound. The method has mild reaction conditions and simple operation, and the use amount of the dihydropyridine compound is the catalysis amount, so that a target product is easily separated and purified from a reaction system; and at the same time, the metal catalyst can be recycled, thereby meeting the economy requirement.

A combustion apparatus according to the present invention can positively control and generate burnt gas recirculation with a simple structure. The combustion apparatus has a cylindrical container (12) having a combustion chamber, a close end (10), and an open end (26), an inflow passages (20) for supplying combustion air into the combustion chamber in the cylindrical container (12), and a fuel nozzle (18) for supplying fuel into the combustion chamber in the cylindrical container (12). A flow (28) of air is formed so as to have a velocity component in a direction of a central axis (J) from the open end (26) to the close end (10) and a velocity component to swirl in a circumferential direction of said annular container (12). Fuel (23) is injected so as to have a velocity component in the direction of the central axis (J) from the close end (10) to the open end (26) and a velocity component directed radially outward.

A combustion apparatus capable of producing the recirculation of combustion gas by positively controlling the recirculation by a simple structure. The combustion apparatus comprises an annular container (12) having an inner tube part (15) forming an inner peripheral side face, an outer tube part (13) forming an outer peripheral side face, an open end part (26), and a closed end part (10). An air flow (28) having a speed component in the direction of a center axis (J) starting at the open end part (26) toward the closed end part (10) and a speed component in the circumferential direction of the annular container (12) is formed in the apparatus. A fuel (23) is jetted to have a speed composition in the direction of the center axis (J) starting at the closed end part (10) toward the open end part (26) and a speed component in the radial outer direction.

The invention discloses a synthetic method of desonide. The synthetic method is characterized by carrying out elimination reaction on prednisone acetate by using sulfur dioxide in the presence of a first catalyst and an inert gas, then carrying out oxidation reaction on a product after elimination by using an oxidant in the presence of a second catalyst, then carrying out condensation treatment on a product after oxidation by using acetone in the presence of a third catalyst, carrying out selective reduction on a product after condensation in the presence of a fourth catalyst and finally carrying out hydrolysis reaction on a product after reduction in the presence of a fifth catalyst, thus preparing desonide. The synthetic method has the beneficial effects that desonide can be obtained by using prednisone acetate as the raw material and carrying out elimination, oxidation, condensation, reduction and hydrolysis; all the solvents in the synthetic process are recycled and reused, heavy metals do not participate in reaction in the reaction process, the technical process is mild and the energy consumption is low, so that the synthetic method is environment-friendly and clean.