17 results about "Stoddard solvent" patented technology

The utility model discloses an organic solvent recovery device which comprises a support, a box body is installed on the support, a cooling box and a distillation box which are arranged in parallel are arranged on the box body, a condensation pipe is arranged in the cooling box, a tank body is installed in the distillation box, a sealing assembly is installed at the top end of the tank body, and the sealing assembly is connected with the cooling box and the distillation box. A stirring motor is installed above the sealing assembly, and the output end of the stirring motor penetrates through the sealing assembly to be connected with a stirring shaft. According to the utility model, the stirring shaft is arranged to synchronously drive the spiral stirrer and the turbine fan to rotate, so that the stirring and steam extraction of a solvent in a reaction are synchronously carried out, a catalyst and a waste solvent are fully contacted to react, and the steam is accelerated to be extracted out of the tank body for condensation through negative pressure generated by the turbine fan during stirring, so that the residence time of the steam in the tank is shortened; meanwhile, a dumping motor and a supporting and connecting assembly are arranged, so that safe dumping of the box body is realized, and the tank body is convenient to clean.

The method for purifying propylene glycol methyl ether acetate from comprehensive waste solvent comprises the following steps: (1) ozone is introduced into the waste solvent, and EDTA-dinaesium calcium is added, and after reaction, the waste solvent is pumped into a multi-layer adsorption tower, and passes through an activated carbon layer, a hydrated zirconium oxide loaded resin layer, a weakly basic anion exchange resin and a molecular sieve layer; (2) acetic acid is added and pumped into a catalytic rectifying tower, a sulfonic acid solid catalyst is arranged in a catalytic section, and a crude product is taken out from a side line of a rectifying section; and (3) the crude product is sent into a double-membrane cascade system, is pumped from an intermediate tank to a PI-ZSM-5 hybrid membrane, is circulated back to the intermediate tank without passing through, is vaporized after passing through a permeate liquid, is sent to a DDR type zeolite membrane, and a vaporized retentate which does not pass through the DDR type zeolite membrane is collected, and a condensed liquid is obtained, and the main product is obtained. Compared with the existing multi-effect heat coupling rectification process, the method reduces energy consumption, and solves the problem of removal of high-boiling-point and near-boiling-point impurities; and for comprehensive waste solvent containing various impurities, the method can also realize efficient purification of propylene glycol methyl ether acetate, and the range of treatable impurity types is wide.

The invention discloses a composite reagent for treating a passenger car coating water-based waste solvent and a treatment method, and belongs to the technical field of automobile coating waste solvent treatment. The treatment method comprises the following steps: successively adding a demulsification destabilizing agent and a separation flocculant into the water-based waste solvent, stirring, standing and settling to realize solid-liquid separation; the demulsification destabilizing agent comprises an inorganic polyelectrolyte, an organic surfactant and a chelating agent according to a specific ratio. The separation flocculant comprises a polymeric flocculant and a cationic polymer in a specific ratio. Through the synergistic effect of chemical demulsification and flocculating settling, efficient treatment of a complex emulsification system is achieved, and the method has the remarkable advantages of being high in hazardous waste reduction rate (up to 85%), simple in technological process, free of dependence on membrane separation equipment, low in operation cost and the like.

The present application relates to the technical field of medicine and chemical industry solvent recovery, specifically to a galanthamine extraction solvent recovery circulating device, comprising: a base table, a pretreatment assembly comprising pretreatment tanks, high-speed centrifuges and multi-stage filter tanks connected in series through connecting pipes, each connecting pipe is provided with an independently controlled electromagnetic valve, and each connecting pipe is provided with a pump, a feed inlet in the middle of a distillation tower is connected with a discharge outlet of the multi-stage filter tank through a feed pipe, a reboiler is arranged at the lower part of the distillation tower, a condenser is arranged on a steam exhaust pipe, a cooling liquid storage tank is arranged on the liquid outlet of the condenser through a flow guide pipe, a solvent purification unit is detachably arranged on the inner side of the upper part of the cooling liquid storage tank, and a reflux pump is connected with the upper part of the distillation tower through a reflux pipe, which can effectively treat the suspended impurities in the galanthamine extraction waste solvent, recycle and purify the ethanol solvent in the galanthamine waste solution, and improve the recovery purity of the ethanol solvent.

The utility model discloses waste solvent recycling and settling equipment which comprises a base bracket and a box body fixedly mounted at the upper end of the base bracket, a material guide pipe is fixedly mounted on the left side of the box body, a first filter is fixedly mounted on the right side of the box body, an air assembly is arranged on the outer side of the front end of the box body, a precipitation treatment pipe is arranged at the front end of the box body, and a first transfer pump and a second transfer pump are arranged at the upper end of the precipitation treatment pipe. The waste solvent is recycled by sedimentation equipment, and if the waste solvent is not treated and is directly discharged, the environment is seriously polluted. According to the waste solvent settling and recycling system, through the treatment processes of settling, filtering, purifying and the like, the consumption of the solvent can be reduced, the pollution to the environment is reduced, the waste solvent can be subjected to settling treatment in sequence by arranging the three settling boxes in the box body, rapid settling treatment of impurities in the waste solvent can be achieved, and the service life of the waste solvent is prolonged. And the effect of impurity precipitation in the box body is ensured, so that the recovery effect of the equipment is improved.

The application relates to the technical field of fluid recovery anti-overflow, in particular to a waste solvent recovery pipeline blockage anti-overflow device, which comprises a recovery funnel, an overflow pipe, a recovery main pipe and a capacitance sensor 1. The bottom of the recovery funnel is communicated with the recovery main pipe, the top side of the recovery funnel is provided with an overflow port, one end of the overflow pipe is communicated with the overflow port, the other end of the overflow pipe is connected to an upper interface of the recovery main pipe, the capacitance sensor is installed on the outer wall of the overflow pipe, the capacitance sensor is located at least 5 centimeters above the interface of the recovery main pipe, and the capacitance sensor is used for detecting whether liquid exists in the overflow pipe and outputting a liquid level signal. The application has the effects that waste solvent can be effectively prevented from overflowing the funnel during backwashing, and pipeline blockage can be prompted by alarm.

The application provides a recovery method of N,N-dimethylacetamide. The method comprises the following steps: waste solvent enters a distillation tower, is taken out in a side line in a gas phase, is directly introduced into a membrane separation unit after being pressurized, is dehydrated, and N,N-dimethylacetamide product is obtained. The application is coupled by means of distillation tower side line gas phase taking out and membrane separation, simplifies the process, reduces process energy consumption, especially saves the material heating process before membrane separation, is green in process, is high in recycling rate, is small in waste discharge amount, and is beneficial to industrialization. Meanwhile, the obtained N,N-dimethylacetamide product is higher than 99.9% in purity and lower than 200 ppm in water content, and completely meets the requirements of solvent reuse.

The invention belongs to the technical field of waste solvent recovery treatment, and discloses an organic waste solvent recovery treatment device which comprises a waste solvent tank, a pneumatic diaphragm pump and a separation tank. Pipe bodies, far away from the pneumatic diaphragm pump, of the suction pipe and the conveying pipe are fixedly connected with the waste solvent tank and the separation tank respectively; a motor is used as a single power source, multi-mechanism linkage operation is achieved through synchronous belt transmission, a grinding rod is driven to eccentrically rotate to complete residue grinding, an L-shaped stirring rod is driven to horizontally move in a reciprocating mode through transmission of a T-shaped rod and a rectangular groove plate, an extracting agent and residues are evenly stirred, meanwhile, beating vibration on a tank body is completed in a linkage mode, and the extraction efficiency is improved. Manual intervention of multi-mechanism operation is not needed in the whole process, integrated automation of the waste solvent from solid-liquid separation, residue discharge, grinding and extraction to adhesion prevention of the tank body is achieved, and the overall recovery treatment efficiency is greatly improved.

The utility model relates to hazardous waste treatment technical field more specifically, relate to a kind of paint cleaning waste solvent recovery processing system, including paint residue processing module, primary filtration module, and the precision filtration module connected with primary filtration module and the reuse water tank connected with the water outlet of precision filtration module, paint residue processing module includes raw liquid tank, solid-liquid separation device, paint residue collecting device and transfer water tank, raw liquid tank is connected with solid-liquid separation device by water inlet pipeline, and the blow-off port of solid-liquid separation device is connected with paint residue collecting device, and the water outlet of solid-liquid separation device is connected with transfer water tank by water outlet pipeline, and the water outlet of transfer water tank is connected with primary filtration module.The system adds flocculating agent to raw liquid tank, separates flocculation and solvent by solid-liquid separation device, waste solvent does not need to be deposited in raw liquid tank, improves the recovery processing efficiency of solvent, and paint residue flocculated into group is separated in solid-liquid separation device, not easy with solvent into next process.

The utility model discloses a new energy automobile waste solvent collector which comprises a collecting barrel, the top of the collecting barrel is connected with an opening and closing plate in a hinged mode, the inner bottom of the collecting barrel is in threaded connection with a filtering assembly for filtering waste solvent, and the bottom of the collecting barrel is in threaded connection with a pipeline for guiding the waste solvent. The top of the pipeline abuts against the bottom of the filtering assembly. According to the utility model, the collector is detachably arranged, so that the collector can be quickly disassembled and dredged when being blocked, and the extension pipeline is arranged at the bottom of the collecting barrel, so that impurities are convenient to sink and collect, and the terminal recovery of a waste solvent is facilitated, thereby reducing the treatment load of the venturi on the waste paint and the waste solvent; the situation that the treatment cost of the agent is increased due to long-time waste paint and waste solvent treatment is prevented, the emission amount of VOC is reduced, and the environment-friendly requirement is met.

The utility model relates to the technical field of waste solvent recovery unit, especially, it is a kind of waste solvent recovery unit of automobile coating line, it provides processing place to waste solvent by distillation barrel, waste solvent inside distillation barrel is heated by heating device, waste solvent is filtered by filtering device, the solvent after distillation in distillation barrel is condensed and collected by condensing device, waste solvent inside distillation barrel is stirred by stirring device, filtering device is cleaned by cleaning device;Including operation platform;It further includes distillation barrel, heating device, filtering device, condensing device, stirring device and cleaning device, distillation barrel and condensing device are all installed on operation platform, heating device, filtering device, stirring device and cleaning device are all installed on distillation barrel;Distillation barrel provides processing place, heating device heats, filtering device filters, condensing device distills and collects, stirring device stirs, and cleaning device cleans.

A system for separating a solvent includes a first mixing tank comprising a waste solvent feed and a reactant feed; a first filter comprising a nanofiltration membrane; a distillation column or an evaporator; a condenser or cooler; and a pervaporation membrane. A method for separating a solvent includes mixing a waste solvent with a reactant to cause precipitation or complexing and forming a mixture; filtering the mixture using a nanofiltration membrane and forming a permeate; distilling or evaporating the permeate to form a concentrated solvent; condensing or cooling the concentrated solvent to below a boiling point of solvents in the concentrated solvent; and filtering the concentrated solvent using pervaporation to form a purified solvent. The system and method may be used to separate and purify a solvent without creating thermal degradation products.

The invention discloses a solvent oil cyclic regeneration system and method suitable for an alkane dehydrogenation device, and belongs to the technical field of alkane dehydrogenation, the system comprises a product gas contact cooling tower, a solvent recovery tower, a cyclic solvent filter and the like, and the inter-section contact cooling tower is cooperated with a compressor. A large part of the product gas is circularly cooled after heat exchange, and a small part enters a solvent recovery tower for stripping regeneration; after regeneration, part of the liquid phase is refluxed and part of the liquid phase is circulated, the solvent containing heavy components at the bottom is used as ethylene washing oil after heat exchange, continuous regeneration of the solvent is achieved, the solvent purchasing cost is saved by 2100,000 yuan every year, and waste solvent discharge is avoided; the device stability is improved, the propylene yield is increased by 0.5-1.0%, the device is suitable for dehydrogenation devices of propane, isobutane and the like, and economic benefits and environmental protection benefits are remarkable.

The invention belongs to the technical field of fomesafen preparation, and particularly relates to a resource-saving fomesafen production process. According to the method, source emission reduction and cost saving are achieved, the comprehensive recovery rate of the whole-process solvent exceeds 90%, material consumption is fundamentally reduced, and the waste solvent treatment burden is relieved. The supported Co-Mn-Br / molecular sieve catalyst has high activity, is easy to recover, avoids heavy metal pollution, and greatly reduces the unit consumption of the catalyst. The nitration reaction is transferred into the micro-channel reactor, so that instant uniform mixing and efficient heat transfer among materials are realized, side reactions such as excessive nitration are effectively inhibited, and a guarantee is provided for obtaining high-purity nitration products. The microwave-assisted heating is introduced into the nitration reaction, and the reaction system quickly reaches and is maintained at the optimal reaction temperature, so that the reaction time is shortened, the energy consumption is reduced, the decomposition side reaction caused by local overheating is reduced, and the reaction selectivity and yield are improved.

The invention relates to the field of electronic chemicals, in particular to a method for preparing an electronic-grade dimethyl sulfoxide product from a dimethyl sulfoxide waste solvent, which comprises the following steps: (1) feeding the DMSO waste solvent into a neutralization dehydration kettle, starting stirring, adding alkali into the neutralization dehydration kettle, and adjusting the pH value of the solvent to be alkaline; (2) discharging the DMSO waste liquid in the neutralization dehydration kettle, filtering the DMSO waste liquid through a filter, conveying the DMSO waste liquid to reduced pressure distillation and solid removal equipment, condensing a solvent gas phase evaporated in the reduced pressure distillation and solid removal equipment through a condenser, and storing the condensed solvent gas phase in a buffer tank; (3) the DMSO solvent in the buffer tank enters a light component removal tower, one part of the material extracted from the bottom of the light component removal tower is heated in a reboiler and then returns to the light component removal tower, and the other part of the material enters a refining tower; and (4) extracting a DMSO intermediate product from a liquid phase extraction port at the upper part of the refining tower, feeding the DMSO intermediate product into an intermediate tank, feeding the DMSO intermediate product into an adsorption tower, and feeding the DMSO intermediate product into a third-stage filter for filtering to obtain an electronic-grade G4-stage high-purity DMSO product. According to the method, the DMSO waste solvent can be recycled, and the electronic-grade high-purity DMSO product can be prepared.

The present invention relates to a method for preparing octamethyltetrasiloxane from CH3Si(OR)3, wherein R is selected from C 1‑6 alkyl, preferably methyl triethoxysilane as raw material (or called precursor), in a mixed solvent containing oxygen heterocyclic compound and water, with organic amine as catalyst. The method has a yield of >60%, product purity ≥99%, and the raw material is easy to obtain, simple operation, can avoid the generation of a large amount of waste solvent and waste water, friendly to the environment, suitable for large-scale industrialization.

The utility model relates to the technical field of waste solvent recovery, in particular to a waste solvent recovery device which comprises a stock solution tank, a rough filtration device, a fine filtration device, a clear liquid tank, a concentrated liquid tank and a deposition tank, the stock solution tank is connected with the rough filtration device through a feeding pump, the rough filtration device is connected with the fine filtration device through a booster pump and a circulating pump, and the clear liquid tank is connected with the concentrated liquid tank through a circulating pump. The fine filtration device is respectively connected with the clear liquid tank and the concentrated liquid tank, so that micromolecular components after fine filtration enter the clear liquid tank and macromolecular components enter the concentrated liquid tank, and the deposition tank is respectively connected with the concentrated liquid tank and the stock solution tank, so that supernatant after precipitation returns to the stock solution tank again for recovery. According to the automatic pumping and filtering system, the high efficiency and continuity of the treatment process are ensured; the recycling of the clean solvent reduces the generation of wastes and saves resources; the concentration purity of the waste solvent can be improved through multiple times of circulating filtration, so that the waste solvent is more suitable for follow-up treatment or reutilization.