38results about How to "Way to save energy" patented technology

The invention discloses a method for absorbing nitrogen oxide tail gas and generating by-product p-phenylenediamine by using aniline. The method comprises the following steps of: reacting part aniline with NOx to obtain diazonium salt; reacting the diazonium salt with the non-reacted aniline to obtain 1,3-diphenyltriazene, wherein the reaction products contain less p-nitroaniline and o-nitroaniline; making the 1,3-diphenyltriazene in a rearrangement reactor generate the rearrangement reaction at 30 DEG C-120 DEG C to convert into p-aminoazobenzene, wherein 90% of the 1,3-diphenyltriazene is converted into the p-aminoazobenzene and the remaining 1,3-diphenyltriazene is converted into o-aminoazobenzene and few impurities after the rearrangement reaction; separating the low distillates from the rearranged materials; and carrying out the hydrogenation reaction: using Raney nickel as a catalyst, continuously inputting hydrogen gas and controlling the pressure and the temperature to be 0.2MPa-4MPa and 25 DEG C-150 DEG C respectively to synthesize the p-phenylenediamine. The method provided by the invention reduces the production cost of the p-phenylenediamine and also reduces environmental pollution. A DCS (distributed control system) computer control system is used so that the automation of the whole system is realized and meanwhile the production efficiency is high.

The invention relates to a preparation method of a cyclopropyl fenpropathin derivative. The preparation method comprises the following steps: synthesizing a cyclopropyl carboxylic acid derivative by taking gamma-butylrolactone as a raw material; and then carrying out acylation, amination and dewatering reactions so as to prepare the cyclopropyl fenpropathin derivative. The method provided by the invention can be used for large-scale industrial production, has the advantages of low energy consumption, less side reactions, high yield, high product purity and the like, and is an ideal safe and efficient energy-saving consumption-reducing process for preparing the cyclopropyl fenpropathin derivative.

The invention relates to a method for directly preparing a thin strip from ferric oxide. The method comprises the following steps of weighing super iron concentrate powder / iron oxide powder with the content larger than 71.5% and an organic binder according to the proportion, mixing in a mixing machine for 30-60 min, pelletizing, sequentially performing preliminary rolling and winding, reducing, rolling and winding for multiple times, and finally sequentially performing secondary sintering, bright heat treatment, finishing and winding, thereby obtaining the thin strip. During the whole production process, ironmaking, steelmaking, hot steel rolling, pickling and alkaline cleaning are not needed, as is known to all, the ironmaking and steelmaking and other processes are performed at the temperature of about 1600 DEG C, and pollution caused by ironmaking, steelmaking, steel rolling, pickling and alkaline cleaning is very serious. In the method, reducing is performed with H2 and / or CO gas,the highest temperature is about 1200 DEG C, three wastes are subjected to ultra-low emission and zero emission, and compared with a traditional ferrous metallurgy and steel powder rolling process, the method is simpler, more environmentally-friendly and more energy-saving.

The invention discloses a manufacturing method for prolonging the service life of a KR stirrer, specifically comprising the steps of: selecting a steel core, removing impurities on the surface of the steel core, washing and cleaning the steel core, and airing; welding a group of riveting pieces with different heights ranging from 30mm to 80mm on the surface of the steel core; covering a refractory fiber material layer with the thickness of 0-50mm on the surface of the steel core, coating a castable layer with the thickness of 60-120mm on the refractory fiber material layer, and baking the entire device for 36-60h at the temperature of 80-100 DEG C; and continuously heating the baked device to ensure that the temperature reaches 320-350 DEG C, and maintaining the temperature for 8-16h. Themethod is simple and energy-saving, and the used materials are not molten at high temperature and can stop the heat from being transmitted to the steel core, therefore, not only is the expansion degree of the steel core alleviated, but also the extrusion stress generated due to the expansion of the steel core can be effectively buffered so that the quantity of the cracks generated after the KR stirrer is baked can be reduced to the minimum.

The invention discloses a production method capable of prolonging the service life of a KR (Krypton) stirrer. The production method includes steps of manufacturing a stirring blade with a steel core into a composite body with metal and pouring materials, arranging metal steel plates on two sides of the stirring blade with the steel core and filling the pouring materials in the middle of the stirring blade with the steel core; removing impurities on the surface of the steel core, washing the steel core, drying the steel core and welding a group of anchoring parts with the size ranging from 30mm to 80mm on the surface of the steel core; fixing a mold well on the periphery of the steel core, pouring the pouring materials in the mold, then placing the mold poured with the pouring materials at room temperature until the pouring materials are hardened, and maintaining the pouring materials for 48 hours to 72 hours after the mold is removed; baking the integral KR stirrer for 36 hours to 60 hours at the temperature ranging from 100 DEG C to 150 DEG C after maintenance is completed; and continuing heating the baked KR stirrer, leading the temperature to reach a range between 320 DEG C and 350 DEG C, and maintaining the temperature for 8 hours to 16 hours. By the aid of the production method, expansion degree of the steel core is reduced, extrusion stress due to expansion of the steel core can be effectively buffered, and accordingly the amount of cracks after the KR stirrer is baked can be reduced to the greatest extent.