31results about How to "Reduce solid waste generation" patented technology

The invention discloses a method for co-producing methylbenzoic acid, methylbenzonitrile and phthalonitrile, comprising: (1) continuously feeding xylene, a catalyst and an oxygen-containing gas into an oxidation reactor for reaction, Obtain the oxidation reaction liquid; (2) enter the oxidation reaction liquid into the initial distillation tower and carry out rectification separation, stop the rectification when the methyl benzyl alcohol content reaches 0.01~0.15wt% in the initial distillation tower bottom liquid, obtain low boiling point component and (3) enter the rectification tower with the initial distillation tower still liquid; (3) stop rectification when toluic acid content reaches 30~90wt% in the rectifying tower tower still liquid, obtain formosan (4) mixing the rectifying tower and tower liquid with ammonia to obtain a nitrile-containing reaction liquid; (5) carrying out rectification and separation of a nitrile-containing reaction liquid to obtain methylbenzene respectively Carbonitrile and phthalonitrile products. The invention has the advantages of simple process, less equipment investment, environmental protection and good comprehensive economic benefits.

The invention discloses a trapping device and process for production of 3,4-dichlorobenzonitrile. The device is simple and reasonable in structural design; the implementation feasibility is high, thepracticability is high, more than 90% of ammonium chloride and more than 8% of 3,4-dichlorobenzonitrile are captured by a first-stage catcher through a dry capture method, more than 76% of 3,4-dichlorobenzonitrile is captured by a second-stage catcher through a dry capture method, latent heat of vaporization of water is fully utilized by the first-stage catcher, and the usage amount of spray liquid-water is small; besides, about 15% of the 3,4-dichlorobenzonitrile crude product collected by a third-stage catcher and a bath tower is dissolved by hot water, dehydrated, rectified and purified toobtain a liquid pure product of 3,4-dichlorobenzonitrile. The generation amount of coke oil and solid waste during the rectification process is low. Compared with a traditional multi-stage wet capturemethod, the consumption of 3,4-dichlorobenzonitrile is reduced, the investment cost of rectification equipment is reduced by more than half, the rectification energy consumption is equivalent to 15%of that of the traditional method, and the economic benefit is good.

The invention provides a method for directly smelting ferrovanadium nitride or ferrovanadium with high-temperature vanadium slag without chemical process, which includes blowing vanadium-containing molten iron from the bottom or side of the furnace when it is close to the end point of vanadium extraction in the process of blowing vanadium in the converter Reductant, iron oxide in the reduction slag; after the semi-steel is produced, add the reducing agent from the top of the vanadium extraction furnace to continue reducing the iron oxide in the vanadium slag, and pour the high-temperature vanadium slag directly into the intermediate frequency induction furnace or electric arc furnace or through the heat preservation slag The tank is poured into the intermediate frequency induction furnace or electric arc furnace, and the vanadium and beneficial metal elements in the vanadium slag are deeply reduced by controlling the reduction temperature in the intermediate frequency induction furnace or electric arc furnace, and ferrovanadium nitride or ferrovanadium is obtained by controlling the amount of nitrogen blown at the bottom . The present invention uses high-temperature vanadium slag as raw material to directly produce ferrovanadium nitride, and can also produce ferrovanadium alloys of different grades, without the need for chemical land, and the production process is green and environmentally friendly, does not produce chemical waste water, and the energy consumption is significantly lower than that of traditional vanadium chemical processes. The process is short.

The invention discloses a trapping device and process for production of o-chlorobenzonitrile. The device is simple and reasonable in structural design, high in implementation feasibility and high in practicability, 90% or above of ammonium chloride is captured through a first-stage catcher by a dry capture method, 70% or above of the o-chlorobenzonitrile is captured through a second-stage catcherby a dry capture method,, the first-stage catcher makes full use of latent heat of vaporization of water, and the usage amount of spray liquid-water is small. Besides, about 30% of crude o-chlorobenzonitrile products captured by a third-stage catcher and a fourth-stage catcher is molten with hot water, dehydrated, rectified and purified to obtain an o-chlorobenzonitrile liquid pure product, and the tar generation amount and the solid waste generation amount in the rectification process are small. Compared with a traditional multi-stage wet capture method, the loss amount of the o-chlorobenzonitrile is reduced. Besides, the investment cost of rectification equipment is reduced by more than half, the rectification energy consumption is equivalent to 30% of that of the traditional method, andthe economic benefits are good.

A catalytic hydrolysis pretreatment method for industrial park wastewater relates to the technical field of industrial wastewater treatment. In order to solve the problems of traditional industrial park wastewater pretreatment, the invention has poor pretreatment effect, cumbersome acid-base adjustment, large amount of oxidative pretreatment, large amount of sludge and unstable operation. Method: 1. Add packing and pretreated industrial wastewater into the catalytic reduction biological hydrolysis tank, add ozone catalytic packing and hydrogen peroxide into the ozone catalytic reaction tank, and pump the upper layer liquid of the industrial wastewater in the catalytic reduction biological hydrolysis tank to the ozone catalytic reaction Catalytic oxidation is carried out in the tank, and the industrial wastewater in the ozone catalytic reaction tank is returned to the catalytic reduction biological hydrolysis tank; the industrial wastewater flows into the flocculation sedimentation tank through the water outlet, the pH is adjusted to 7-8.5, polyacrylamide is added, and precipitation is completed to complete the industrial wastewater. Catalytic hydrolysis pretreatment. The invention can obtain a method for catalytic hydrolysis pretreatment of industrial park wastewater.

The invention discloses a process for treating mother liquid pigment in magnesium sulfate production, relates to the technical field of chemical decolorization, and comprises the following process steps: (1) resin column preparation; (2) pigment adsorption; (3) pigment analysis. The present invention adopts the resin method, first absorbing the organic pigment in the magnesium sulfate mother liquor to the resin, and then decomposing it with a solvent, recovering the solvent, and reusing the resin; not only greatly reducing the amount of solid waste generated, but also simple process operation, the magnesium sulfate mother liquor Excellent depigmentation effect.

The invention discloses a wastewater processing control method for promoting the advanced oxidation effect, and belongs to the field of wastewater processing. The method comprises following steps: (1)detecting the kinds and corresponding mole concentrations of heavy metal ions in wastewater; (2) adding an oxidizing agent into wastewater to carry out an advanced oxidation treatment, wherein the addition amount of the oxidizing agent is determined based on the content of heavy metal ions in the wastewater; (3) detecting the effluent of the step (2), and stopping the advanced oxidation treatment, if the COD concentration is not greater than 50 mg / L and the TOC concentration is not more than 20 mg / L; if not, carrying out a further advanced oxidation treatment. The method has the advantages that the actual water quality is taken into account, the oxidation reaction efficiency is maximized, the medicaments are effectively saved at the same time, and the operation cost is reduced therefore.

The invention relates to a steel slag treatment method using a two-step method of oxidation desulfurization and reduction dephosphorization, belongs to the technical field of iron and steel metallurgy and resource utilization, and solves the problem of enrichment of sulfur and phosphorus in the existing steel slag recycling technology. The steel slag treatment method using the two-step method of oxidation desulfurization and reduction dephosphorization includes S1. Oxidative desulfurization of steel slag; passing Ar and O into molten steel slag 2 The mixed gas, the SO obtained by oxidation 2 Overflow and remove from the slag phase, the removal rate of S is 82-97%; S2. The desulfurized steel slag obtained in step S1 is subjected to gas-based reduction dephosphorization; the reducing gas is CO and CO 2 The mixed gas, the removal rate of phosphorus reaches more than 80%, and the P obtained by reduction 2 Spilled and removed from the slag. The invention can completely solve the problem of removing sulfur and phosphorus in steel slag, greatly improve the recycling rate of steel slag, realize the full utilization of steel slag, S and P, reduce the cost of steelmaking, increase the utilization value of sulfur and phosphorus, and have broad application prospects.

The invention belongs to the technical field of water treatment and particularly provides an arsenic removal device with monitoring and regenerating functions and a use method thereof. The arsenic removal device consists of a main body, a regenerating device, a monitoring system and a power control system, wherein the main body is a fixed bed processor equipped with an inner core made from a cloth-shaped arsenic adsorption fiber material. The arsenic removal device is characterized in that the cloth-shaped arsenic adsorption fiber material is adopted to manufacture the arsenic removal inner core, the arsenic removal inner core is formed by rolling the cloth-shaped arsenic adsorption fiber material around a central shaft, the arsenic removal inner core is cylindrical, is tight in interlayer lamination and is vertically mounted in a housing, and no gap exists between the layers of the cloth-shaped arsenic adsorption fiber material or between the arsenic removal inner core and the inner wall of the housing; the regenerating system consists of a regenerated liquid tank, a pump valve and a pipeline; and the monitoring system consists of a quartz column with a rapid arsenic detection reagent and comparison columns. The arsenic removal device has the advantages of excellent water permeability, high arsenic removal efficiency, easy desorption regeneration and the like, can monitor the arsenic concentration of water in real time and provides instructions for desorption regeneration while ensuring that the effluent meets the discharge standard.

The invention relates to a catalyst, a preparation method and a hydrotreating method of vanillin tar. The catalyst comprises a cesium-containing compound, Pd / TiO 2 and Pt / TiO 2 The hydrotreating method of vanillin tar is as follows: in ethanol solvent, using vanillin tar as reaction raw material, directly catalyzing hydrocracking to recover guaiacol. The method is simple to operate, green and environmentally friendly. On the one hand, the residual vanillin and 5-aldehyde-based vanillin by-products in the vanillin tar are cracked and recovered, and at the same time, tars such as vanillin dimerization and deep oxidation are added again. Hydrogen cracking into high value-added guaiacol products. It not only reduces the treatment cost of solid waste, but also has better economic benefits.