56results about How to "Uniform residence time" patented technology

An object of the present invention is to provide a method for reducing a chromium-containing material at a high chromium reduction degree. In the method of the present invention, a mixture of a feedstock containing chromium oxide and a carbonaceous reductant is heated and reduced by radiation heating in a moving hearth furnace. The average rate of raising the temperature of the mixture in the reduction is preferably 13.96° C. / s or higher in the period from the initiation of the radiation heating of the mixture until the mixture reaches 1,114° C.

The invention relates to an improved production method of N-phosphonomethyl glycine, in which a carbon catalyst is filled in a multi-stage fixed bed reactor; phosphonomethyl iminodiacetic acid slurry with the concentration in percentage by weight of 2-10% is used as a feed liquid to be mixed and heated firstly, then is sent into the fixed bed reactor after being pumped and metered, and is fully contacted with oxygen-containing gas which is supplied into the fixed bed reactor via a gas distributor so as to carry out catalytic oxidation reaction to continuously oxidize the phosphonomethy liminodiacetic acid into glyphosate; and the multi-stage fixed bed reactor is an isothermal reaction system formed by a plurality of stages of reactors connected in series, the top of each stage of reactor is provided with the feed liquid and the gas distributor, and the temperature of each stage of reactor is provided by heating or cooling media. A reaction pressure of 0-1.5 MPa and a reaction temperature of 30-180 DEG C are maintained in each stage of fixed bed reactor, and gas, liquid and solid in the reactor are fully contacted to carry out oxidizing reaction to obtain glyphosate feed liquid. The invention has the advantages of finding a multi-stage series isothermal reactor mode which has more uniform retention time than the existing fixed bed reactor and avoids excessive oxidation, and provides an application process which can keep ideal yield of glyphosate after being amplified.

The invention relates to a multilayer falling pipe type falling film devolatilization reactor, which mainly comprises an outer tower and a plurality of tower cores, wherein the outer tower consists of a tower top, a tower body and a tower bottom; the plurality of tower cores arranged inside the outer tower are in sequential arrangement from top to bottom; each tower core consists of a tower plate and a plurality of falling film falling pipes in parallel arrangement; each falling film falling pipe consists of hollow pipes and a plurality of umbrella skirt-shaped falling sleeves which are provided with downward openings and are fixed on the outer side wall of the hollow pipes; the hollow pipes are mutually connected; heat media are introduced into the hollow pipes; a heat exchange pipeline is used for connection. Compared with a conventional reactor, the multilayer falling pipe type falling film devolatilization reactor has the advantages that the structure is simple; a large gas-liquid interface is realized; the stretching effect is generated on the film surface; the surface updating speed is high; the flow rate is high; the dwell time is controllable; the structure is simple; the additional power equipment is not used; the reaction energy consumption is low; the heat transfer efficiency is high.