32results about How to "Reduce process water consumption" patented technology

The invention discloses a bio-preparation method for production of high-purity xylo-oligosaccharide and coproduction of arabinose and xylose. The method comprises the following steps of: washing hemicellulose-enriched biomass, performing size mixing pretreatment, adding xylanase, performing enzymolysis, and separating and purifying to obtain mixed liquid glucose; concentrating the mixed liquid glucose until the mass concentration is 50 to 70 percent, and performing chromatographic separation to sequentially obtain AD phase, BD phase, CD phase and BD phase, and concentrating the BD phase to obtain a high-purity xylo-oligosaccharide syrup liquid product; concentrating the CD phase, mixing with cellulosic materials, drying, and crushing to prepare fiber feed; performing yeast fermentation on the AD phase to remove glucose, removing impurities, purifying, concentrating and performing chromatographic separation to obtain the high-purity xylose liquid and arabinose liquid; concentrating the xylose liquid, crystallizing, separating and drying to obtain crystallized xylose; and concentrating arabinose liquid, crystallizing, separating and drying to obtain crystallized arabinose. The invention also provides a bio-preparation method for arabinose and xylose.

The invention discloses an optimum scheme of an ultra-supercritical secondary reheating unit, and refers to a secondary reheating unit of a coal-fired power plant after optimization of a back heating system, parameter optimization of main steam, primary reheating steam, and secondary reheating steam, and structural optimization of a turbine body. The optimum scheme of the ultra-supercritical secondary reheating unit can obviously reduce the heat loss of the secondary reheating unit, and significantly decrease greenhouse gas emission and decreases cost of the ultra-supercritical secondary reheating unit obviously. By taking a 1200 MW grade unit as an example, four mono-axial cylinders are used for gas exhausting, the ultra-supercritical secondary reheating unit is composed of a single-flow ultra-high pressure cylinder capable of completely supplying water, back-heating and pumping gas, a dual-flow high and medium pressure cylinder, and two dual-flow middle and low pressure cylinders; there is no middle pressure cylinder and a middle low pressure linking pipe; no gas pumping opening is arranged on the high middle pressure cylinder and the middle low pressure cylinder; the water supply and back heating are provided by a first pump, a new second pump, a new third pump, and a new fourth pump; a ultra-low temperature coal economizer, and a heat primary wind condensing water heater replace a seventh pump, an eighth pump, a ninth pump, and a tenth pump to heat the condensed water; all low-pressure heaters are canceled.

The invention relates to a method for manufacturing natural gas by utilizing low-rank coal. The method comprises the following steps of charging multielement gasifying agent consisting of oxygen, steam and carbon dioxide into a crushed-coal pressurized gasification furnace to gasify the low-rank coal to produce raw gas and obtain the raw gas containing methane gas; charging a part of raw gas into a furnace filled with cobalt-molybdenum sulfur-resistant oil-resistant catalyst to carry out a CO conversion reaction, combining the other part of raw gas with the gas subjected to the CO conversion reaction through a sub-line so that the molar ratio of H2 to CO is within 3.05-3.45 and meets the requirement of a raw material gas for synthesizing the methane; synthesizing the methane in a methanation device filled with a MoSi2 sulfur-resistant catalyst by utilizing the conversed gas; and enabling the methanated mixed gas to pass through cool, dehydrated and deacidified gas to obtain products with high natural gas product quality standard ruled in the national standard GB-17820-1999. The method disclosed by the invention has the advantages of high efficiency, energy conservation and environment protection.

The invention discloses a preparation method of high-purity 2,4-D. The preparation method comprises the following steps: (1) preparing 2,4-bitionolate; (2) enabling chloroacetic acid and the 2,4-bitionolate to directly react under the alkaline condition to obtain 2,4-D sodium salt; (3) achieving pressure filtration and acidification of the 2,4-D sodium salt to form a 2,4-D crude product; (4) rinsing- pressure-filtering and drying the 2,4-D crude product to obtained to the high-purity 2,4-D product. The preparation method provided by the invention can effectively reduce the process water consumption, simplify the process steps, greatly shorten the reaction time and improve the product yield.

The invention provides a method for refining caprolactam. The method comprises the following steps: providing a caprolactam-containing benzene solution to be refined; evaporating the caprolactam-containing benzene solution under normal pressure to remove benzene, thus obtaining molten crude caprolactam; adding a solvent to the molten crude caprolactam, hot filtering after the molten crude caprolactam is completely dissolved, thus obtaining a filtrate; and crystallizing the filtrate at 15-60 DEG C and separating centrifugally to obtain refined caprolactam. The method for refining caprolactam is simple in process flow and moreover the water consumption of the process is reduced greatly.

The invention discloses a desulfurization wastewater treatment method, and belongs to the field of desulfurization wastewater treatment. A hot air unit introduces hot air into a phase change generator; meanwhile, a wastewater system conveys desulfurization wastewater to an atomizer in the phase change generator for atomization, hot wind formed by the desulfurization wastewater and the hot air is changed into a gas phase from a liquid phase through mass and heat exchange and the gas phase is discharged from an outlet of the phase change generator along with the hot wind; a solid formed by impurity crystal in the desulfurization wastewater enters the hot air unit at a solid outlet of the phase change generator under the action of gravity. According to the desulfurization wastewater treatment method, hot air in the phase change generator and atomized desulfurization wastewater drops are subjected to mass and heat exchange, and the desulfurization wastewater drops are evaporated and crystallized and then subjected to gas-solid separation. The problems that an original desulfurization balance is broken and equipment corrosion is caused in the desulfurization wastewater treatment process in a flue are solved, so that zero pollution and zero emission of the desulfurization wastewater are achieved.

The invention provides a process for preparing fatty acid through low pressure continuous hydrolytic decomposition, wherein the water-oil weight ratio is 5-30:100, the pump output pressure is controlled between the range of 0.02-0.5MPa, preferably between 0.1-0.4MPa, the raw materials are subjected to heat transfer through heat exchanger and are charged into heating-furnace to be heated to 250-500 deg. C and enter reactor, reacting for 2-30 minutes and the reaction product is led out, the fatty acid is obtained by straight distillation of separated crude fatty acid or fuel gas.

The invention discloses a novel flue gas waste heat recycling method. The novel flue gas waste heat recycling method is characterized in that flue gas temperatures of all sections of the tail portionof a flue of a boiler are different, so that high-temperature flue gas heat exchangers of corresponding energy levels, medium-temperature flue gas heat exchangers of corresponding energy levels, low-temperature flue gas heat exchangers of corresponding energy levels and low-low-temperature flue gas heat exchangers of corresponding energy levels are additionally arranged at different positions in the flue so as to fully and deeply utilize flue gas waste heat and achieve energy conservation and emission reduction; the different grades of the flue gas waste heat at the tail portion of the boileris comprehensively utilized, moreover, according to flue gas waste heat resources and different use requirements provided by users, different flow division and different proportions of different coldsources and all stages of flue gas waste heat are achieved by virtue of all stages of heat exchange equipment, and finally energy level matching and gradient utilization are achieved; according to thenovel flue gas waste heat recycling method, the flue gas exhaust temperature is effectively reduced, the generating capacity is increased, the coal consumption is reduced, the dust removal efficiencyand the desulfurization efficiency are improved, the desulfurization water consumption is reduced, a chimney is protected, and the problem of environmental protection up-to-standard emission of enterprises is solved to a certain extent.

The invention provides a refining method of caprolactam. The refining method comprises following steps: a caprolactam-containing benzene solution to be refined is provided; the caprolactam-containing benzene solution is added into a first solvent, and filtering is carried out after full mixing so as to obtain a filtrate, wherein molar ratio of the first solvent to benzene is controlled to be 1:10-10:1; the filtrate is subjected to normal pressure distillation so as to remove benzene and the first solvent and obtain molten crude caprolactam; the molten crude caprolactam is added into a second solvent, crystallization is carried out at 15 to 60 DEG C after complete dissolving, and centrifugal separation is carried out so as to obtain refined caprolactam, wherein mass ratio of the molten crude caprolactam to the second solvent is controlled to be 1:3-2:1. Compared with conventional caprolactam refining methods, the above refining method of caprolactam possesses following advantages: steps such as water reverse extraction and ion exchange are avoided, process flow is simple, and process water consumption is reduced greatly.

The invention discloses a low-cost method for treating waste water. The method comprises the following steps: step 1, preteating the wastewater; step 2, sending the treated waste water into a concentration tower for concentration; step 3, spray drying the concentrated waste water in a spray drying tower; step 4, carrying out pyrolysis and thermal oxidation on that organic toxic components in the waste water; step 5, separating dry salt from flue gas containing water vapor and salt in a dust remover; step 6, desulfurizing and denitrifying the flue gas containing water vapor; step 7, recoveringthat condensed water in the flue gas and removing residual pollutants in the waste water; step 8: using the treated water as circulating water. The low-cost method for treating waste water is convenient for the recycling of water, ensures the recycling of energy, achieves the purpose of treating waste water at low cost, makes the discharged smoke cleaner, purifies the smoke, reduces the dischargeof PM2.5, and reduces the generation of haze.

The invention discloses a continuous ammonia neutralization process of 2-methyl-5-nitroimidazole nitration completion liquid. The method comprises the following steps of: respectively conveying nitration reaction completion liquid diluted by water and ammonia water solution for neutralization to a T-shaped mixer by a steady flow conveying metering pump, and carrying out instantaneous mixing and instantaneous neutralization reaction, wherein the flow ratio of the nitration reaction completion liquid to the ammonia water solution for neutralization is subjected to linkage closed-loop regulation through the PH value of the mixed feed liquid in the crystallization kettle; after mixing is completed, entering the crystallization kettle for crystallization; and then, carrying out separation, washing and drying to obtain a finished product. The method has the advantages that the continuous ammonia neutralization of the nitration reaction completion liquid of the 2-methyl-5-nitroimidazole is realized, and the production efficiency is greatly improved; after the neutralized and washed product is dried, the appearance is whiter, and the quality is better; meanwhile, the yield of the product 2-methyl-5-nitroimidazole in the neutralization process is increased by 99.8% or above; and compared with the traditional intermittent neutralization process, the water consumption can be saved by more than 30%.

The invention belongs to the field of fabric treatment, and particularly discloses a multifunctional refining agent which is mainly used in a cold batch pretreatment process. Comprising a nonionic surfactant, an anionic surfactant, an antistatic agent, a stabilizer, a chelating dispersion system, an antibacterial agent, an enzyme preparation, a pH regulator, a mixture formed by mixing polyether ester and vegetable oil according to the mass ratio of 1: 3, a solvent and water, the cleaning agent is prepared from components in parts by mass as follows: 12-19 parts of a nonionic surfactant, 13-24 parts of an anionic surfactant, 0.3-0.9 parts of an antistatic agent, 2-7 parts of a stabilizer, 5-9 parts of a chelating dispersion system, 0.2-0.6 parts of an antibacterial agent, 1.5-7.9 parts of an enzyme preparation, 4-9 parts of a pH regulator, 6-14 parts of a mixture of polyether ester and vegetable oil and a proper amount of a solvent and water. The refining agent disclosed by the invention has a refining capillary effect improving effect, relatively good infiltration capacity and excellent hydrogen peroxide stability.

The invention relates to a method for preparing a nitryl chlorine solution. Methylene dichloride is taken as an extracting agent, extraction is carried out by adopting a decanter, the extraction and separation efficiency can be improved effectively, the using amounts of the extracting agent and process water are reduced, the obtained nitryl chlorine solution is high in purity and can be directly used for a next-step reaction, compared with a hydraulic analysis method, the concentration of the waste sulfuric acid prepared according to the method is high, and the method can be directly used in the preparation process of ferrous sulfate.

The invention discloses a flue gas prewashing method for energy conservation and consumption reduction of a wet flue gas desulfurization system. The method includes following steps: replenishing water into a prewashing size buffer tank; starting a prewashing size buffer tank stirrer, and continuing replenishing water into the prewashing size buffer tank; starting a prewashing size circulating pump, gathering waste liquid after washing at the bottom of an induced draft fan flue, and enabling the waste liquid to automatically flow into a prewashing drainage pit through a drainage port of the induced draft fan flue; starting a prewashing drainage pit stirrer, and continuing discharging the waste liquid into the prewashing drainage pit; turning off the prewashing size circulating pump, and turning on a prewashing drainage pit pump to discharge washing liquid into the prewashing size buffer tank for recycling use; stopping the prewashing drainage pit pump when liquid level of the prewashing drainage pit lowers to not greater than 2m; repeating the above steps until a flue gas detection index is lower than a designed value, and pumping flue gas into an inlet of an absorption tower. By the flue gas prewashing method, the defect that the flue gas contains much oil dirt and is high in temperature and dust concentration in the prior art is overcome.

The invention discloses a mannase preparation method and an extraction and refining device of mannase. The mannase preparation method comprises the following steps: firstly, performing liquid fermentation to pichia pastoris engineering strain to obtain a fermented liquor, then extracting and refining, the specific extracting and refining steps are as follows: 1) circularly filtering and concentrating the fermented liquor through a ceramic film, wherein the temperature of the cyclic liquor is controlled to be below 20 DEG C; 2) after concentrating for certain time, taking clear filtrate filtered by the ceramic film, and circularly concentrating through an ultrafilter membrane equipment, wherein the temperature of the cyclic liquor is controlled to be below 20 DEG C; and 3) when the volume of concentrated liquor in the step 2) is reduced to 1/5-1/10 of the clear filtrate, adding starch and evenly mixing, and finally performing spray granulation, to obtain mannase. Adopting the ceramic film for filtering not only can hold up producing strains, but also realize filtration sterilization, and through coupling with the concentration of the ultrafiltration membrane, the technological time can be shortened, the proliferation risk of microorganism can be reduced, the hygienic index pass percent of the obtained finished product is greatly improved to 99%, and the yield of the product is improved to 83% or above.

The invention discloses a recycling method of lactic acid fermentation acid-containing wastewater, which comprises the following steps: (1) uniformly mixing corn starch and reverse osmosis wastewater, and carrying out slurry mixing; (2) dissolving the prepared corn starch, performing enzymolysis twice, and performing plate frame filtration to obtain liquefied sugar clear liquid; (3) respectively supplementing the liquefied sugar clear liquid, ammonium sulfate, yeast powder and other nutrients to the reverse osmosis wastewater to adjust the concentration, continuously killing bacteria to obtain a microbial culture medium, and carrying out strain fermentation; (4) after fermentation, separating thalli out through solid-liquid separation, obtaining lactic acid through acidolysis, increasing the concentration of the lactic acid through concentration of an evaporator to generate a large amount of lactic acid-containing wastewater in the evaporation process; (5) neutralizing the lactic acid-containing wastewater through calcium hydroxide to produce calcium lactate, and enabling a calcium lactate solution to penetrate through a reverse osmosis membrane to obtain a calcium lactate concentrated solution and reverse osmosis wastewater; and returning the generated wastewater to the step (1) and the step (3), and circulating in this way. According to the method, the sewage treatment cost is relatively saved, the recovery rate of lactic acid is increased, and the method has important environmental benefits and economic benefits.