46results about How to "Reduce post-processing burden" patented technology

The invention discloses a method for preparing cyanopyridine by using chloropyridine under the catalysis of ligand-free palladium, and the method comprises the following steps: in the organic solvent, adopting chloropyridine and potassium ferrocyanide as raw material and potassium carbonate-palladium acetate as catalyst to react at 40-200 DEG C for 2-20h under the protection of inert gas and obtaining cyanopyridine. The method that cyanopyridine is prepared through the catalysis of ligand-free palladium adopts accessible potassium ferrocyanide as source of cyano group so as to avoid the use of virulent cyanides such as sodium cyanide, potassium cyanide and the like, reduce the damage of waste acid and the operational hazard, lower the post-treatment load and not need to add expensive phosphine ligand. The operation is simple, thus being applicable to the large-scale production of cyanopyridine compounds.

The invention discloses a method for treating antibiotic wastewater and belongs to the field of wastewater treatment. The treatment method comprises the following steps: pre-treatment, hydrolysis and acidification, bioaugmentation-based first-stage treatment, Fenton oxidation and biological advanced treatment. The method is applied to treat wastewater from antibiotic production, works with high efficiency, ensures that the effluent quality is safe and stable and meets the requirements listed in the water quality standard GB / T18920-2002, and can achieve the purposes of beneficial cycle of water resources and green production in enterprises.

The invention discloses an alkali silicate glass frit, a zirconium frit opaque glaze, a zirconium raw material opaque glaze and a ceramic glazing method, wherein the main raw material of the frit glaze is a frit formed of waste silica gel and soda ash , wherein the amount of waste silica gel and soda ash meets the molar ratio of introduced SiO2 and Na2O of 2-3:1, while the raw glaze is directly pulped and fired by using waste silica gel and other raw materials. The opacifying glaze of the present invention uses zirconium-containing waste silica gel (abbreviated as waste silica gel, the same below) as raw materials, and uses the residual zirconium as an opacifying agent, which not only solves the problems of waste silica gel storage and environmental pollution, but also reduces the types of raw materials used , reduces the production cost of the opacity glaze, the waste silica gel in the preparation process can be used directly without physical and chemical treatment, which is convenient for industrial application, and the performance of the obtained opacity glaze can meet the general requirements.

The invention discloses a culture method for reducing emission of nitrogen and phosphorus from pig raising and application. The method comprises the step of feeding growing and fattening pigs by adopting a manner of mixing green feed and fine feed, wherein the green feed provides 30-35 percent of the acceptable daily intake of crude protein every day for the feeding growing and fattening pigs, and the fine feed provides 65-70 percent of the acceptable daily intake of the crude protein every day for the feeding growing and fattening pigs. The fine feed is commercial pig feed, the green feed is made from sweet potato stems, melon vines or wild water spinach usually planted in the farmland, and the water content of the green feed is 80-90 percent by mass. The method can effectively reduce the content of main pollutants in waste and excrements, has a little influence on the weight increase of the growing and fattening pigs, realizes the pollution and emission reduction of the pig breeding industry, and can save the breeding cost and improve the economic benefit.

The invention relates to a farmland nitrogen and phosphorous non-point source pollution control and recycle system, and a method thereof. The system comprises a water collector, an adsorption unit and a water store which are sequentially arranged from the upstream to the downstream according to farmland surface runoff and underground runoff paths. The water collector, the adsorption unit and the water store are sequentially transversely arranged according to the farmland surface runoff and underground runoff paths, so when rain falls or irrigation is carried out, the farmland water is surplus, meets in the water collector through the farmland surface runoff and underground runoff, the water in the collector continuously downward flows and goes through the adsorption unit, nitrogen (N) and phosphorous (P) are adsorbed, the purified farmland drainage enters the water store, and the superfluous purified drainage is discharged to a river and a lake; and when farmland recharging is carried out, the water which reversely flows goes through the adsorption unit for the N and P desorption, and the desorbed N and P enter the water collector with the water flow, afresh enter the farmland and are adsorbed and utilized by crops. Compared with the prior art, the method has the advantages of pollution control, recycle, fertilizing cost saving and the like.

The invention discloses an emergent disposal method for soil polluted by a filter solution of chromium slags. The emergent disposal method comprises the following steps: step I, firstly, determining the initial concentration range of total chromium in the filter solution of chromium slags on the surface of soil, when the content of the total chromium in the filter solution of chromium slags, to be disposed, is too high, diluting the filter solution of chromium slags on the surface of the soil in advance by adopting a water-dilution method, wherein the concentration is controlled within 0.157-52.3mg / L; step II, adding a dry coal ash-CaO mixing agent in the filter solution of chromium slags in the step I, and controlling the ratio of solid to liquid within 2.5-7:50; step III, sufficiently mixing the filter solution of chromium slags and the coal ash-CaO for 7-24 hours at the stirring speed of 100-300r / min. The emergent disposal method disclosed by the invention is simple to operate, low in price, small in pollution, and free from energy consumption, so that subsequent disposal burden for chromium mud is relieved; therefore, a foundation for the resource utilization of coal ash is laid.

The present invention discloses a method for preparing amidosulfone and preparing N-substituted imine by using said amidosulfone. The method for preparing amidosulfone is characterized by that in water or mixed solution of water and organic solvent said method utilizes the action of protonic acid to make aldehyde, acylamide and sulfinate undergo the process of condensation reaction so as to form the amidosulfone, and the method for preparing N-substitute imine includes the following steps: adopting the above-mentioned amidosulfone and making it be reacted in the double-phase medium formed from organic phase and alkali-containing water phase, using alkali to remove sulfinic acid from amidosulfone to form N-substituted imine, separating organic phase to obtain said product and separating water phase to recover sulfinate.