155results about How to "Shorten the concentration time" patented technology

The invention relates to a method of sludge concentration and dewatering which can treat sludge with different water contents and can recycle the treated sludge. The method comprises the following steps: (1) firstly the sludge is concentrated; (2) then modulating agent is added in the concentrated sludge to mix; the mixture is transported to a dewatering device to take dewatering; (3) when the dewatered sludge meets the requirement of the final disposition, the corresponding disposition can be carried out directly; the invention is characterized in that: before the sludge in the step (1) is concentrated, organic modulating agent is added to carry out a first modulating; before the concentrated sludge in the step (2) enters the dewatering device, inorganic modulating agent is added to carry out a second modulating. The method of sludge concentration and dewatering provided by the invention has high efficiency of sludge concentration and dewatering, has low energy consumption, reduces the water content at large amplitude, saves time of the operation processing, has low investment and operation cost and simple process operation.

The invention discloses a preparation process of glycine, which comprises amination, alkaline hydrolysis, ammonia discharge acidification, decolorizing, concentration, desalting, crystallization and recrystallization steps, wherein in the amination step, hydroxyacetonitrile and ammonia water are mixed in a tubular reactor, and a reaction is undergone at the temperature of 50-100 DEG C under the pressure of 0.5-2.0 MPa for 4-10 minutes; and in the alkaline hydrolysis step, 30-50 percent of sodium hydroxide solution is added into an alkaline hydrolysis reactor in advance, an amination liquid is collected from an amination liquid outlet, a reaction is undergone at the temperature of 60-90 DEG C under the pressure of between -0.01 MPa and -0.09 MPa, and ammonia in a system is recovered simultaneously. In the process, the tubular reactor is taken as an amination reactor, so that the reaction temperature and pressure are raised, the reaction time is shortened, and raw material decomposition, pyrolytic polymerization of aminoacetonitrile and the generation of byproducts are reduced; alkaline hydrolysis is performed during the collection of the amination liquid, the concentration of an alkaline liquor and the alkaline hydrolysis temperature are raised simultaneously, and ammonia in the system is recovered under reduced pressure, so that the alkaline hydrolysis reaction is more complete, the speed is higher, and the generation of colored impurities is reduced; and a mother liquor circular utilizing mode is established, so that the treatment amount of waste mother liquor is reduced, the product yield is increased, and the production cost is reduced.

The invention relates to an electric field enhanced fast membrane concentration method and device, which relates to a method and a device for concentrating charged solute molecules, colloid molecules and particles in a solution by using membrane technology. Select a filter membrane with a molecular weight cut-off greater than that of the solute molecule or a pore size greater than the diameter of the particles. By applying a direct current electric field, the molecules or particles will undergo electrophoretic movement away from the membrane surface to improve the retention rate of the solute molecules and particles on the separation side of the membrane, while the solvent will penetrate quickly. Through the membrane, the rapid concentration of solute molecules or particles is realized. Compared with the conventional membrane concentration process, the invention can greatly reduce the concentration time, improve the concentration efficiency, significantly reduce the membrane pollution, and increase the service life of the membrane.