32results about How to "Reduce the amount of alkali" patented technology

The invention discloses a method for processing waste water containing heavy metals by utilizing an internal electrolysis-electrolysis method, which is characterized in that the waste water meeting the requirements of microelectrolysis processing is microelectrolyzed; the waste water is electrolyzed after the microelectrolysis reaches to the requirements thereof in a certain time so as to reach effluent standards or the requirements of recycle and the subsequent processing; the microelectrolysis bears a part of the task for processing the waste water containing the heavy metals and plays a preprocessing role of the electrolysis method; and the electrolysis method bears the remaining task for processing the rest waste water containing the heavy metals and plays the postprocessing role of the microelectrolysis. The invention organically integrates the microelectrolysis method and the electrolysis method, the two methods cooperate with each other and play roles together, and the processing method has the advantages of simple technique, processing efficiency enhancement of the waste water containing the heavy metals, and processing cost reduction.

The invention belongs to the technical field of dissolving pulp preparation and relates to a stewing method for preparing bamboo wood dissolving pulp, which comprises the following steps of: (a) introducing vapor to a boiler: preparing bamboo wood raw materials into slice materials, conveying the slice materials to a digester, and introducing low pressure vapor to the digester while conveying theslice materials; (b) vapor heating and pre-hydrolyzing: heating through the vapor after introducing the vapor to the boiler to pre-hydrolyze the slice materials; (c) neutralizing through white liquor: neutralizing the slice materials and vapor condensed water in the digester through the white liquor in a hot white liquor tank; (d) replacing through hot black liquor: replacing the neutralization liquid waste in the digester through the hot black liquor in a hot black liquor tank; (e) heating and stewing in a temperature control manner to prepare virgin pulp of the bamboo wood dissolving pulp; (f) replacing the washing black liquor, washing and cooling the virgin pulp; and (g) discharging at a low temperature. The invention has the advantages of reducing the production cost, increasing the production efficiency, effectively utilizing the stewing heat and improving the yield and the quality of the bamboo wood dissolving pulp.

The invention discloses a hydrogenolysis method of cyclohexyl hydroperoxide and belongs to the technical field of organic chemistry. The method comprises the following specific steps: washing a cyclohexane oxidation solution containing cyclohexyl hydroperoxide, isolating an organic phase, adding a Pd/Al catalyst into the organic phase, introducing hydrogen, reacting at the temperature of 50-120 DEG C and at the pressure of 0.1-1.5 MPa for 0.1-3h, filtering the catalyst, carrying out alkali cleaning by adding 5-30 wt% of alkali lye into the reaction liquid with introduced hydrogen, washing with water after alkali cleaning, carrying out liquid separation after water washing, and collecting the organic phase, wherein mass ratio of the catalyst to the organic phase is 1:10-10000 and diameter of the catalyst is 0.01-10mm. The Pd/Al catalyst is used to catalyze hydrogenolysis of cyclohexyl hydroperoxide; reaction condition is mild; selectivity is high; treatment after the reaction is convenient; dosage of the catalyst is low and the catalyst can be recycled; and conversion rate and selectivity are high.

This invention is about production method of organic esterified starch, characterized with esterization after pre-cross bonding of starch slurry, then washing and desiccation drying.the cross linker consists of chloroacetic acid and gluconolactone in the weight proportion of 3:7. compared with the previous denaturized starch method, the invention we reported here is simple-manipulated, low-priced, lower temperature in starch esterization by 10deg C (in the range of 48deg C-52deg C now), Brinell viscosity is up to 5000-7000BU from2400-3300BU. We are leading in both of the two main index, gelatinization temperature and viscosity domesticly and in the world. This invention also has a large application scale and prominent economic profit.

The invention discloses a wastewater phosphorus recovery pretreatment process, belonging to the field of water pollution control and resource recycling. The wastewater phosphorus recovery pretreatment process comprises the following steps: performing CO2 air stripping of the phosphorus-containing wastewater in an air stripping tank (tower); leading the wastewater after air stripping into a sedimentation tank in an automatic-flow mode; removing the suspension organic matters, colloids and some sediments of the wastewater in the sedimentation tank; performing phosphorus recovery of the effluent of the sedimentation tank through magnesium ammonium phosphate or calcium phosphate crystallization reaction. By adopting the wastewater phosphorus recovery pretreatment process disclosed by the invention, the alkali added for phosphorus recovery can be greatly reduced, the content of impurities in the phosphorus recovery product is reduced, and meanwhile, the problem of scaling of facilities such as water pumps, pipe fittings and the like is effectively solved.

The invention relates to a method for preparing a medicine intermediate, namely 1-methyl-3-phenyl-piperazine. Epoxy phenylethane and N-methyl ethanolamine react for ring opening in a methylbenzene solution and further react with thionyl chloride to obtain N-(2- chloroethyl)-N-methyl-2-chloro-2-phenylethylamine hydrochloride, the hydrochloride reacts with toluene sulfonamide and sodium hydroxide in a DMF solution to obtain 1-methyl-4-p-toluenesufonyl-3-phenylpiperazine, the 1-methyl-4-p-toluenesufonyl-3-phenylpiperazine reacts with concentrated hydrochloric acid to remove sulfonyl, and a product is obtained through neutralization extraction and recrystallization. Compared with the prior art, the method for preparing the 1-methyl-3-phenyl-piperazine has the advantages of low cost of selected raw materials, cost conservation, few synthesis steps, convenient and safe operation, simple post-treatment, high reaction yield, high product purity, good quality, and suitability for industrialized application.

The invention discloses a process for synthesizing 2-amino-4-acetylaminoanisole. The process comprises the steps of preparing 2,4-dinitroanisole from 2,4-dinitrochlorobenzene, which serves as a raw material, in methanol, in the presence of sodium hydroxide or potassium hydroxide, carrying out reduction in the presence of action of Pd/C catalyst by taking hydrazine monoformate as a hydrogen sourceso as to prepare a 2,4-diaminoanisole-methanol solution, and then, subjecting 2,4-diaminoanisole and acetic anhydride to a partial acylation reaction in the presence of an acid binding agent, therebypreparing the 2-amino-4-acetylaminoanisole. According to the process disclosed by the invention, the energy consumption is low, the cost is low, the volume of solid waste and waste liquid is small, the process is environmentally friendly, the operation is simple, the reaction conditions are mild, the industrial safety coefficient is big, the total yield of a target compound is 85% or more (by initial reactants), the HPLC purity is 99.0% or more, and the target compound is high in yield and good in quality, so that the process is more applicable to industrial production.

The invention discloses a production method for a papermaking cooking reagent. The method includes: firstly weighing all raw materials for standby use; heating deionized water to boiling, then adding methacrylic acid, hydroxymethyl cellulose and sodium citrate, stirring the materials uniformly, conducting heat preservation at 65-70DEG C, then adding citric acid to adjust the pH value to 5-7; adding dioctadecyl dimethyl ammonium chloride, an emulsifier and sodium hexametaphosphate, then conducting shearing dispersion, performing cooling, then adding a light stabilizer, a defoaming agent and a penetrating agent, and stirring the materials evenly to obtain the papermaking cooking reagent. The method provided by the invention has the advantages of simple process and convenient manufacturing. The cooking reagent prepared by the method can speed up the soaking and permeation effects of a cooking liquor on raw materials, can reduce the alkali consumption, and improve and protect the fiber strength. The decocted slurry is soft and loose, and has good elasticity. And the finally prepared paper can be prevented from wrinkling.

The invention relates to a method and an apparatus for reducing the cyanogen content of coking wastewater. The apparatus comprises a regenerating tower, a circulating ammonia pump, a raw material ammonia water pipeline, an alkali tank, a 42% alkali pump and a 2.5-5% alkali pump; the regenerating tower is connected with a desulphurization lean solution pump, the outlet of the desulphurization lean solution pump is connected with the circulating ammonia water pump, and the circulating ammonia water pump is connected with a coke oven; one end of the raw material ammonia water pipeline is connected with the raw material ammonia water pump, the other end of the raw material ammonia water pipeline is connected with the alkali washing section of a desulfurization tower, and the raw material ammonia water pipeline is connected with the 42% alkali pump; and the bottom of the alkali washing section of the desulfurization tower is connected with the alkali tank, and the alkali tank is respectively connected with an ammonia distiller and the alkali washing section of the desulfurization tower through the 2.5-5% alkali pump. Raw material ammonia water substitutes distilled ammonia wastewater and is mixed with a concentrated alkali, and the obtained mixture is sent to the alkali washing section of the desulfurization tower in order to remove hydrogen sulfide and hydrogen cyanide. The stability of the ammonia water volume of the alkali washing section is guaranteed; and the ammonia content of the raw material ammonia water is high, so the raw material ammonia water has a better desulphurization effect than the distilled ammonia wastewater.

The invention discloses a multistage anaerobic system for treating waste vegetable pulp. The multistage anaerobic system comprises a pretreatment unit, an ethanol fermentation type acid-producing phase reactor, an intermediate sedimentation tank, a sludge dewatering system, an air stripping tank, a methane-producing phase reactor and an aerobic treatment unit, wherein the pretreatment unit is connected with the ethanol fermentation type acid-producing phase reactor through a pipeline, and a pump body is arranged in the pipeline to provide power; the ethanol fermentation type acid-producing phase reactor is communicated with the intermediate sedimentation tank; the bottom of the intermediate sedimentation tank is communicated with a sludge dewatering system, the top of the intermediate sedimentation tank is communicated with an air stripping tank, the air stripping tank is communicated with a methane-producing phase reactor through a pipeline, a pump body is arranged in the pipeline to provide power, and a return pipe is arranged between the air stripping tank and the methane-producing phase reactor; and the methane-producing phase reactor is communicated with an aerobic treatment unit. Under the condition that a metal coagulant is not added, pollutants in the high-concentration organic wastewater can be removed, and the treatment effect is stable and efficient.

The invention discloses an environment-friendly hard water resisting potassium fulvic acid preparation method and aims at solving the problem that a potassium fulvic acid product prepared by an existing method has poor hard water resistance. The method comprises the following steps: 1, suspending pulverized coal in water, adding H2O2, NaNO3 and a solid acid catalyst and performing stirring reaction; 2, adding KOH into a reaction system, then using ammonium hydroxide to adjust the pH value of a solution to 9.0, continuing stirring and centrifugally separating, wherein obtained liquid is a potassium fulvic acid solution; 3, vacuum concentrating the potassium fulvic acid solution and using a spray drying mode to obtain solid potassium fulvic acid. The potassium fulvic acid prepared by the preparation method disclosed by the invention has very high hard water resistance activity; without any anti-coagulation additive, a dilute solution prepared from 30 DEG C hard water has no coagulation phenomenon after being placed for 120 hours. The preparation method disclosed by the invention can be applied to preparing potassium fulvic acid.

The invention provides an ammoximation wastewater treatment method and application thereof. The treatment method of the ammoximation wastewater provided by the invention comprises the following steps: S1, carrying out coagulating sedimentation on the ammoximation wastewater to obtain wastewater subjected to coagulating sedimentation; s2, carrying out iron-carbon micro-electrolysis-Fenton oxidation synchronous treatment on the wastewater subjected to coagulating sedimentation to obtain wastewater subjected to synchronous treatment; and S3, carrying out biochemical treatment on the synchronously treated wastewater. The processes are combined and synergistic, so that the influence of organic nitrogen on wastewater treatment is basically eliminated, and up-to-standard discharge of ammoximation wastewater can be realized.

The invention discloses a softening treatment method for high-hardness water, which comprises a pretreatment unit and a salt separation unit, and comprises the following steps: 1) introducing the high-hardness water into the pretreatment unit, and removing turbidity and silicon in the high-hardness water in the pretreatment unit to ensure that the turbidity of the effluent is less than or equal to 20NTU and the silicon (based on SiO2) is less than or equal to 20mg/L; (2) cooling the pretreated effluent, feeding the cooled effluent into a salt separation unit for salt separation, mainly retaining calcium and magnesium ions on a concentrated water side, and mainly feeding ammonia nitrogen into a produced water side; concentrated water enters a sewage treatment plant or is further softened, and produced water is conveyed to a backwater system. The method preferably comprises a recycling unit, so that resource utilization is realized. According to the method, the removal effect that the total hardness of high-hardness water with the hardness larger than 500 mg/L is reduced by 50-98% can be achieved; and especially when being used for coal gasification ash water softening treatment, the softening agent has beneficial hardness removal effect, simultaneously removes silicate scales, effectively solves the problem of scaling of a gasification furnace system, and prolongs the stable operation period.