477results about "Crystallization plant arrangements" patented technology

The invention provides a sulfamic acid continuous crystallization production device and process, the sulfamic acid continuous crystallization production device comprises a filter box and a production box, the production box is fixedly connected to the upper surface of the filter box through bolts, the top end of the production box is provided with a feeding pipe, the middle part of the interior of the production box is provided with a partition plate, and the middle part of the partition plate is provided with a conveying pipe; a discharging pipe, a production reaction module and a filtering and cleaning module are arranged between the production box and the filtering box. According to the sulfamic acid continuous crystallization production device and the sulfamic acid continuous crystallization production process, in the sulfamic acid continuous crystallization production process, when sulfamic acid crystals are filtered out from mother liquor through the filter cartridge, purified water is sprayed into the filter cartridge through the spray head; and the sulfamic acid crystals can be quickly and uniformly washed to remove impurities through the filter cartridge which continuously shakes in a reciprocating manner in the rotating process, so that the continuous crystallization production efficiency of the sulfamic acid can be effectively improved.

The invention discloses a p-methyl benzyl chloride production process and a production system thereof, p-xylene side chains and chlorine are subjected to a gas phase substitution reaction under micro negative pressure and visible light catalysis to generate crude methyl benzyl chloride and hydrogen chloride, and 99.0% methyl benzyl chloride, a small amount of benzyl dichloride and 31% hydrochloric acid are respectively generated through rectification and absorption; the device consists of four working sections of chlorination, rectification, hydrochloric acid absorption and distillation. According to the method, the defects in the prior art are overcome, on one hand, chlorine is introduced, and an aromatic ring chlorination reaction is carried out under visible light catalysis; on one hand, a supported catalyst filler is arranged at the bottom of a chlorination tower, and a zeolite molecular sieve modified by long-chain alkylsilane and supported by metal salt is used as a catalyst to catalyze chloromethylation reaction, on the other hand, the hydrophobicity of the modified catalyst is obviously enhanced, and meanwhile, the density of acidic sites is not reduced; the contact opportunity of the catalyst and a reaction substrate is greatly increased, and the catalytic efficiency of the catalyst is improved.

The invention discloses a method for purifying p-dioxanone by coupling vacuum distillation with solution crystallization, which comprises the following steps of: firstly, removing light and heavy impurities from a p-dioxanone crude product in a vacuum distillation manner; and the rectified and purified p-dioxanone enters a crystallizer to be subjected to solution crystallization operation to obtain high-purity p-dioxanone, and crystallization mother liquor is returned to vacuum rectification after the solvent is removed.

The invention discloses a process and equipment for producing special melamine by a gas phase quenching method. The production process comprises the following steps: hot process gas from an outlet of a melamine reactor is in contact with cold process gas in a crystallizer, a generated solid A is discharged from the bottom of the crystallizer, and mixed gas enters a trap for gas-solid separation to obtain a solid B; the solid A is conveyed into a high-pressure collecting device A through high-pressure conveying gas A, it is ensured that the temperature of the high-pressure conveying gas A is higher than 120 DEG C in the conveying process, after gas-solid separation is conducted in the high-pressure collecting device A, the solid A is conveyed into a packaging device A through low-pressure conveying gas A, and it is ensured that the temperature of the solid A at the conveying tail end does not exceed 85 DEG C.

The invention provides an evaporative crystallization device and process for fluorine-containing high-salinity wastewater, and relates to the technical field of high-salinity wastewater treatment.The evaporative crystallization device for the fluorine-containing high-salinity wastewater comprises a support and an evaporation tank, and a first material opening used for communicating a stacking ring cavity with a material storage cavity is formed in an inner cylinder; a second material opening for communicating the material storage cavity with the material discharge cavity is formed in the first baffle plate; the heating assembly is in contact with and heats the wastewater to evaporate and discharge a wastewater solvent, a wastewater solute is gradually separated out to form crystals and moves towards the material stacking ring cavity, the first material opening is controlled to be opened, the second material opening is controlled to be closed, the crystals in the material stacking ring cavity enter the material storage cavity through the first material opening, and then the first material opening is controlled to be closed and the second material opening is controlled to be opened; the crystals in the material storage cavity enter the material discharging cavity through the second material opening, the crystals in the material discharging cavity are discharged through the first auger, the separated crystals can be continuously discharged without shutdown, meanwhile, the negative pressure environment in the evaporation tank is prevented from being damaged, and the working efficiency is improved.

The invention relates to the technical field of fertilizer processing, and provides a fluidized bed granulation device and a granulation method.The fluidized bed granulation device comprises a fluidized bed granulator, a cooler, a molten liquid conveying pump and a seed crystal making machine, and the molten liquid conveying pump is communicated with the fluidized bed granulator and the cooler through a first flow path; the molten liquid conveying pump is used for pumping molten liquid to the fluidized bed granulator and the cooler through the first flow path; the seed crystal making machine is respectively communicated with the fluidized bed granulator, the cooler and the molten liquid delivery pump through a second flow path, and is used for making the molten liquid pumped by the molten liquid delivery pump through the second flow path into seed crystals; and the seed crystal is conveyed to the fluidized bed granulator and the cooler through the second flow path. According to the invention, large-particle products with good roundness and good hardness can be produced without crushing of a crusher, and the product quality is improved.

The invention provides a system and a method for producing high-purity electronic-grade carbonic ester, and the system comprises a heterogeneous reaction section, a separation section and a crystallization section along the material flow direction, the heterogeneous reaction section is used for carrying out heterogeneous reaction on ethylene oxide and carbon dioxide to prepare carbonic ester; the separation section is used for separating materials from the heterogeneous reaction section and comprises a flash evaporation unit and a rectification unit in the material flow direction, and the flash evaporation unit comprises at least one flash evaporation tank; the rectification unit comprises at least one rectification tower, and the side-draw of the rectification unit is communicated with the feed port of the crystallization section; and the crystallization section is used for crystallizing and purifying the material mainly containing carbonic ester from the separation section. According to the method, high-purity ethylene carbonate used as a power battery can be obtained from the crystallization section, and crystallization mother liquor can be selectively returned to the separation section to be concentrated. The method can effectively improve product purity, reduce product chromaticity and reduce energy consumption, and can be applied to industrial production of carbonic ester.

In a general aspect, a carbon dioxide (CO2) removal system uses geothermal energy. In some implementations, a method to remove CO2 gas from a gaseous feed includes directing a gaseous feed to interact with an alkaline capture solution in a first gas-liquid contactor. A first portion of CO2 from the gaseous feed dissolves into the alkaline capture solution to form a CO2-rich alkaline capture solution. Steam is generated using heat from a geothermal heat source, and the steam heats the CO2-rich alkaline capture solution in a second gas-liquid contactor. A second portion of the CO2 is separated from the CO2-rich alkaline capture solution in the second gas-liquid contactor to form a CO2-lean alkaline capture solution. The CO2-lean alkaline capture solution is directed to the first gas-liquid contactor.

The invention provides an ultrasonic-assisted gamma-aminobutyric acid crystallization particle size regulation and control method, which comprises the following steps: removing impurities and decolorizing gamma-aminobutyric acid-containing feed liquid, heating, stirring and concentrating to a nearly saturated state, then carrying out ultrasonic-assisted crystallization, cooling, aging and suction filtration to obtain coarse crystals, and finally washing and drying to obtain target crystals. According to the method, a synergistic process of raw material liquid pretreatment, evaporation concentration-ultrasonic-cooling coupling crystallization, aging and post-treatment is adopted, an ultrasonic cavitation effect is utilized to reduce a nucleation barrier, and a supersaturation degree precise control and gradient cooling strategy is combined, so that grain size refinement, obvious narrowing of distribution and effective inhibition of agglomeration of crystals are realized; the median particle size of the crystal can be controlled to be smaller than or equal to 200 microns, the particle size distribution span is smaller than or equal to 1.5, the agglomeration phenomenon is remarkably inhibited, the crystal form is kept stable, the crystal habit is complete and smooth, the crystal product quality and the process efficiency are remarkably improved, and the method has important industrial application value.

Provided is a method of recovering valuable materials that is a method of recovering lithium carbonate from a lithium-ion secondary battery, where the lithium carbonate has a boron content of less than 1 ppm and a calcium content of 100 ppm or less. The method includes a heat treatment step, a crushing and classification step, a slurry formation step, a wet magnetic separation step, an acid leaching step, a neutralization step, a neutralized cake solid-liquid separation step, a calcium carbonate crystallization step, a calcium carbonate solid-liquid separation step, and a calcium adsorption and removal step.

The invention relates to the technical field of acetaminophen crystallization, in particular to a multi-stage continuous cooling crystallization device and method for acetaminophen. The invention provides a multi-stage continuous cooling crystallization method for acetaminophen, which comprises the following steps: S1, at least five stages of continuous cooling crystallization are adopted, and circulating water with a set temperature is injected into a jacket of a crystallization kettle during each stage of cooling crystallization; wherein during the first several stages of crystallization, the difference between the initial temperature of the material entering the crystallization kettle and the initial temperature of the circulating water is 13-25 DEG C; and during the last crystallization, the initial temperature of the material entering the crystallization kettle is 30-35 DEG C. According to the multi-stage continuous cooling crystallization method, different water temperatures are adopted to carry out gradient cooling on the materials, so that the problems of non-uniform grain size and low purity caused by crystal explosion due to large temperature difference between the materials and a refrigerant and high cooling rate in the early stage of cooling are avoided.

The invention belongs to the technical field of coal chemical industry grey water treatment, and particularly relates to an advanced treatment method and system for coal chemical industry grey water circulating water. The method integrates pretreatment, complexing cracking, fractional crystallization and deep deamination, and is characterized in that a chelating structure of an organic phosphorus dispersing agent and calcium and magnesium ions is thoroughly destroyed through an advanced reduction-advanced oxidation combined process, target ions are released, and the core problems that hardness removal is hindered and phosphorus pollution is caused are solved; then, calcium and magnesium are respectively converted into calcium carbonate and magnesium ammonium phosphate particles for resource recovery by utilizing a secondary crystallization technology, so that the bottlenecks of high alkali liquor consumption and salt accumulation of a traditional high-pH magnesium ion precipitation method are broken through; and finally, the residual ammonia nitrogen is deeply removed by adopting a pollution-resistant PTFE hydrophobic membrane, so that the residual ammonia nitrogen is efficiently and stably removed, and the problem that a traditional polypropylene material membrane system is easy to pollute and block, easy to oxidize and difficult to apply to the field is solved.

The invention provides a process for recovering sodium sulfate, sodium carbonate and glaserite in alkali ash and removing chloride ions. The process specifically comprises the following steps: dissolving the alkali ash; sodium sulfate and sodium carbonate in the alkali ash solution are separated through hot crystallization; cooling, crystallizing and separating glaserite in the alkali ash solution; sulfate ions and carbonate ions in the alkali ash solution are separated from chloride ions; and further separating sodium sulfate, sodium carbonate, glauberite and the like in the alkali ash solution. Meanwhile, the invention provides a system for implementing the process. The system comprises an alkali ash dissolving unit, a main crystallization unit, a glaserite crystallization unit, a nanofiltration unit and other elements. According to the process and the system provided by the invention, on one hand, sodium sulfate and sodium carbonate in the alkali ash solution can be extracted, glaserite can be extracted at the same time, chloride ions in the solution are removed at the same time, and the discharge amount of mother liquor is reduced.

The invention relates to the technical field of wastewater treatment, in particular to a high-salinity wastewater low-temperature crystallization melting desalting device and method.The high-salinity wastewater low-temperature crystallization melting desalting device comprises a crystallization melting desalting device, a ton barrel and an infusion pump arranged on the crystallization melting desalting device, the infusion pump is slidably connected to the side wall of the crystallization melting desalting device, and a bottom frame is arranged beside the crystallization melting desalting device; the bottom frame is slidably connected with a containing frame used for containing a ton barrel, the containing frame is provided with two containing grooves matched with the ton barrel, the liquid inlet end of the infusion pump is fixedly connected with a fixing pipe, the side wall of the fixing pipe is fixedly connected with a side pipe, the side wall of the fixing pipe is provided with a conical sealing ring, and the upper side and the lower side of the outer wall of the side pipe are each provided with a top groove. Through the arrangement of the fixing pipe, the side pipe, the driving mechanism and other structures, rapid connection between the ton barrel and the crystallization melting desalter can be automatically achieved, meanwhile, an exhaust groove of the ton barrel can be automatically opened, connection between the ton barrel and the crystallization melting desalter can be rapidly released after extraction is completed, manual disassembly and assembly by workers are not needed, and the convenient performance of the device is greatly improved.

Black mass from disused lithium batteries is leached for recovery of various metals in a process that includes precipitation, solvent exchange, ion exchange, and salt splitting to create multiple product streams for recovery of pure value products. Most typically, the process is a closed-loop process and allows for production of metallic cobalt and nickel, EMD, and a high purity lithium hydroxide or carbonate product with minimal generation of waste streams.

The cooling crystallization production system comprises a crystallization unit, a product storage tank, a pipeline and a switching unit, the crystallization unit is composed of at least two parallel crystallizers, feeding ports of the crystallizers are connected with a discharging port of a distribution tank, and a discharging port of the distribution tank is connected with a discharging port of the product storage tank. Each crystallizer is a double-pipe heat exchanger, the shell pass of each crystallizer is a material flow path, and the tube pass of each crystallizer is a cold / hot medium flow path; the pipeline and switching unit is configured to selectively enable any crystallizer to be connected into a circulation loop, and in the circulation loop, materials circularly flow in the shell pass of the crystallizer through a circulation pump so as to achieve cooling crystallization. The crystallizer completing crystallization can be selectively switched to a discharging pipeline, and a heating medium is introduced into the tube pass of the crystallizer to melt crystals and then output the crystals into the product storage tank; compared with the prior art, a semi-continuous production mode is constructed, and the production cycle of unit products is shortened.

The invention discloses a crystallization device for sodium sarcosinate production, relates to the technical field of crystallization devices, and aims to solve the problems that when supersaturated liquid drops make contact with the wall surface of a low-temperature gas-liquid separator, water evaporation is intensified, the solubility of solute is further reduced due to temperature reduction, crystal precipitation is accelerated under the dual action, the supersaturated liquid drops are prone to being attached to the wall of a tank in the crystallization process, and the crystallization effect is poor. In order to solve the problems that the heat exchange efficiency is influenced by scaling of a tank wall, wall-adhered crystals cannot be recycled and the yield is reduced in the prior art, an evaporator is mounted on one side of a gas-liquid separator, a cyclone separator is mounted on the other side of the gas-liquid separator, an ultrasonic disperser is mounted on one side of the cyclone separator, a membrane filter is mounted on one side of the ultrasonic disperser, and a water outlet is formed in the other side of the membrane filter. A gas-liquid separator cleaning mechanism is mounted in the gas-liquid separator, a gas-liquid separator scraping frame is mounted at one end of the gas-liquid separator cleaning mechanism, and a membrane filter cleaning mechanism is mounted in the membrane filter.

The invention provides a production device and process for recovering electronic-grade phosphoric acid from waste etching liquid. The device comprises a raw material storage tank, a multi-stage filtration system, a phosphoric acid evaporation kettle, a purification system, a mixed acid storage tank and a neutralization reaction and crystallization system. The waste etching liquid enters an evaporation kettle after being subjected to multi-stage filtration to remove suspended solid particles, and phosphoric acid is separated from volatile nitric acid and acetic acid; and condensing the volatile acid into mixed acid for storage, and removing metal ions from the semi-finished phosphoric acid through a purification system to obtain the electronic-grade phosphoric acid. The mixed acid reacts with alkali to generate a mixed solution of sodium acetate and nitric acid, sodium acetate crystals are separated out through evaporation and concentration, a solid product is obtained after separation, nitric acid is obtained by condensing gas, and suspended particles and metal impurities are subjected to incineration treatment. Through the steps of filtering, negative-pressure evaporation, neutralization and crystallization and the like, the process realizes efficient recovery of electronic-grade phosphoric acid and byproducts of sodium acetate and nitric acid, and has the characteristics of high resource recovery rate and low pollution emission.

The invention relates to the technical field of insecticides, and discloses an indoxacarb finished product crystallization device and method.The indoxacarb finished product crystallization device comprises a supporting bracket, a stirring tank is arranged at the top of the supporting bracket, an opening plate is arranged on one side of the stirring tank, a mounting frame is arranged at the top of the stirring tank, a driving source is arranged on the mounting frame, and a rotating shaft is arranged at the output end of the driving source; a fixing frame is arranged at the bottom of the inner wall of the stirring tank, and a homogenizing assembly is arranged on the fixing frame; the fixing frame is further provided with a vibration assembly. The homogenizing assembly is used for uniformly mixing the indoxacarb finished product solution in the stirring tank; the vibration assembly is used for reducing the phenomenon of local supersaturation of liquid in the stirring tank through vibration. Compared with the prior art, crystal agglomeration can be reduced, the particle distribution uniformity can be improved, the wall surface scaling risk can be reduced, the cleaning and maintenance frequency can be reduced, and the production efficiency and the product quality can be improved.

The invention relates to a wastewater treatment method, in particular to a capacitive deionization-oxidation coupling high-salt industrial wastewater treatment process, which comprises the following steps: firstly, carrying out micro-filtration to remove suspended matters and adjust the pH value, then carrying out low-voltage electro-adsorption desalination through a modified capacitive deionization unit, collecting electric energy released in a regeneration stage, converting the electric energy into electric energy of a catalytic oxidation unit through a converter, and carrying out high-salt industrial wastewater treatment. Desalted water enters a non-free radical catalytic oxidation unit, a UV-LED excitation catalyst activates persulfate, singlet oxygen is generated to degrade organic matter, an intelligent control system dynamically adjusts voltage, medicament and energy distribution according to the water inlet condition, finally, capacitive deionization regeneration liquid is subjected to multi-stage membrane concentration and crystallization, salt products are recycled, and waste water treatment and recycling are achieved.

Disclosed is a lithium recovery system for black mass, including: a heat treatment unit that performs heat treatment to convert the black mass into soluble substances and insoluble substances; a water leaching unit that leaches the heat-treated black mass with water to separate the heat-treated black mass into a water leaching solution, which contains lithium ions and carbonate ions, and insoluble substances; and an impurity removal unit that removes impurities contained in the water leaching solution by lowering pH of the water leaching solution through addition of carbon dioxide-containing gas to the water leaching solution.

The invention relates to the technical field of ammonium dihydrogen phosphate preparation, and discloses a high-purity ammonium dihydrogen phosphate crystallization device and a method thereof.The high-purity ammonium dihydrogen phosphate crystallization device comprises a first-stage crystallization system, a first-stage centrifugal separation system, a second-stage crystallization system and a second-stage centrifugal separation system which are connected in series. The primary crystallization system comprises a crystal elimination heater, a crystal elimination mixer, a bag filter and a DTB flash cooling crystallizer which are connected in sequence, and is used for primarily purifying a concentrated solution; the primary centrifugal separation system is used for separating primary crystals; the second-stage crystallization system comprises a crystal dissolving tank, an OSLO cooling crystallizer and the like, and deep crystallization is carried out after the first-stage crystal is dissolved; the secondary centrifugal separation system is used for separating secondary crystals; through two-stage crystallization coupling, mother liquor graded circulation, a unique gradient washing process and active impurity control, efficient and continuous production of battery-grade ammonium dihydrogen phosphate with wet-process phosphoric acid as a raw material is realized, the product purity is high, the process flow is simplified, the cost is low, and the system operation is stable.

The present invention relates to an improved process for the recovery of valuables in the form of graphitic carbon fractions, cryolite, sodium fluoride, sodium carbonate / sulphate, and mixed hydroxides from spent anode dust and first-cut spent pot lining materials obtained from electrolytic reduction cells which are used to produce aluminium metal. The recovered graphite has various applications in electrostatic charge dissipative coating, Li-Battery and so on.

The invention relates to the technical field of propiconazole purification, in particular to a propiconazole purification device which comprises a purification tank, and the top end of the purification tank is fixedly communicated with a fixed cover; the detection mechanism comprises a semicircular lamp panel for emitting light, a photoresistor plate for detecting the light emitted by the semicircular lamp panel is arranged in the purification tank, and the detection mechanism is used for detecting the concentration and crystallization degree of a solution needing to be purified. A semicircular lamp panel in the detection mechanism emits light, the absorption and scattering of the light are influenced by the concentration of a solution, the intensity of light irradiated on the photosensitive resistor plate is changed, and then the resistance value of the photosensitive resistor plate is changed. When the solution concentration is high, the light intensity and the resistance value are large, the current passing through the electromagnet is large, the electromagnet is strong in magnetism, the permanent magnet on the sliding plate is repelled to slide upwards, the L-shaped conducting strip slides upwards on the resistor strip, the resistance of the sliding rheostat is reduced, the current passing through the self-adaptive adjusting loop is increased, and the stirring speed is increased.

The invention relates to the technical field of water treatment, in particular to a sludge phosphorus release and phosphorus crystal recovery device which comprises a phosphorus release mechanism and a phosphorus crystal recovery mechanism, and the phosphorus release mechanism comprises a sludge concentration unit, a sludge breaking assembly and a sludge dewatering unit; the sludge disintegration assembly comprises a sludge disintegration unit and a pH value adjusting unit, the phosphorus crystal recovery mechanism comprises an outer shell, a middle shell, an inner shell, a plug flow stirring assembly, a folded plate vortex assembly, a modular vortex assembly, an inclined plate assembly and a micro-nano aeration disc, the outer shell, the middle shell and the inner shell are combined to form a unique circulation channel, and the outer shell, the middle shell and the inner shell are combined with the micro-nano aeration disc; according to the method, small-particle crystals are used as seed crystals to enter a circulating channel, so that ready-made nucleation sites are provided for a solution, the critical supersaturation degree required for forming new crystal nucleuses is reduced, the probability of spontaneous nucleation is reduced, the generation of irregular dendritic or needle-shaped crystals is inhibited, and the formation of more compact and uniform prismatic or sheet-shaped large-particle crystals is promoted; and efficient phosphorus release and phosphorus crystal recovery are realized.

The invention discloses a method of a calcium fluoride crystallization system based on a functional quartz sand coupled fluidized bed, which comprises the following steps: S1, pretreating quartz sand by using sodium hydroxide, and reacting silicon hydroxyl with silicon dioxide in the quartz sand by using KH550 as a silane coupling agent; and step S2, grafting a high-molecular organic monomer 2-acrylamido-2-methylpropanesulfonic acid on the KH550 in the step S1, and carrying out negative charge electricity modification. The fluorine ions in the fluorine-containing wastewater form calcium fluoride crystals through the fluidized bed, calcium fluoride is captured in situ through functional quartz sand, heterogeneous crystallization of calcium fluoride is enhanced, the filterability of precipitation particles is improved, calcium fluoride is captured in a resource mode while deep fluorine removal is achieved, the removal efficiency of the fluorine ions can be improved, and the method is suitable for industrial production. The fluorine concentration of the discharged water is reduced, the problem that follow-up agent adding is needed due to high turbidity of the discharged water of a traditional fluidized bed crystallizer is solved, the sludge yield is reduced, and the economical efficiency and sustainability of wastewater treatment are improved.

The invention discloses a carbon dioxide trapping and sealing device, which belongs to the technical field of carbon dioxide trapping, and comprises a trapping container with a gas outlet pipe arranged at the top and a gas inlet pipe arranged at the bottom, and a control end arranged on the outer wall of the trapping container, and further comprises a stacked reaction tower vertically arranged in the trapping container and formed by stacking multiple stages of conical units, annular air gaps are formed among the multi-stage conical units, an airflow distributor and a central shaft tube are fixedly mounted at the bottom of the multi-stage conical units, and the central shaft tube is fixed with the multi-stage conical units through a bracket; and the alkaline solution supply assembly is arranged at the top of the trapping container. Flue gas with carbon dioxide escapes through the annular air gap of the laminated reaction tower, the alkaline solution is sprayed to the laminated reaction tower through the alkaline solution supply assembly, and after the carbon dioxide escapes from the annular air gap, the carbon dioxide and the alkaline solution are intersected twice, so that the carbon dioxide is fully captured.

To provide a process for forming drug crystals of narrow size distribution and desire dimensions and morphology.SOLUTION: The present invention relates to a process for providing corticosteroid crystals of desired size distribution and morphology, the process comprising the steps of: providing recrystallized ultra-large columnar crystals having aspect ratios of more than 1 and less than 20, the aspect ratio of a given columnar crystal being the ratio of a longest dimension along a lengthwise axis relative to a shortest dimension of a transverse plane perpendicular to the lengthwise axis; and sizing the recrystallized ultra-large columnar crystals to provide a collection of sized crystals having target dimensions, wherein the sizing includes segmenting at least a part of the recrystallized ultra-large columnar crystals along the respective lengthwise axes while retaining the dimensions of the transverse plane perpendicular to the lengthwise axis.SELECTED DRAWING: None

A process for production of both purified recycled aromatic dicarboxylic acid (rCA) and purified aromatic dicarboxylic acid (vCA), said process comprising:Producing a first stream comprising a recycled aromatic dicarboxylic acid by a first process, wherein the first process comprises the depolymerisation of a polymer feedstock comprising a polymer of said aromatic dicarboxylic acid in a first reaction system;Producing a second stream comprising the aromatic dicarboxylic acid by a second process wherein the second process comprises the oxidation of an aromatic hydrocarbon in a second reaction system;Purifying both the first stream and the second stream in a common purification system to thereby produce both purified recycled aromatic dicarboxylic acid (rCA) and purified aromatic dicarboxylic acid (vCA).The present invention also provides an apparatus for the production of both purified recycled aromatic dicarboxylic acid (rCA) and purified aromatic dicarboxylic acid (vCA),

It is provided an environmentally friendly process for recycling metals and nonmetallic components from printed circuit boards (PCBs), without using treatments considered damaging to the environment and minimizing emission of greenhouse gases comprising the steps of shredding the PCBs, micronizing the shredded PCBs producing a micronized powder, removing plastic and epoxy from the micronized powder, leaching, precipitating and recuperating the Al, Fe, Zn, Ni, Cr, Cu, Au, Ag, and Pd from the micronized powder, producing a filtrate from which the Cu is recovered. The solid product of the process is a concentrate of precious metals.