The utility model discloses a new recovery system for recovering acid and alkali from viscose sodium sulfate waste liquid through a bipolar membrane electrodialysis process. The system comprises a bipolar membrane electrodialysis membrane module, a sulfuric acid recovery pipeline, an alkali recovery pipeline, a pretreatment device, a reverse osmosis concentration device, an electrodialysis concentration device, a low-temperature multi-effect concentration device, a multi-effect evaporation concentration device and an evaporation concentration device, wherein the pretreatment device is communicated with the bipolar membrane electrodialysis membrane module; the bipolar membrane electrodialysis membrane module is communicated with the reverse osmosis concentration device; the reverse osmosis concentration device is communicated with the electrodialysis concentration device; the electrodialysis concentration device is communicated with the low-temperature multi-effect concentration device; the low-temperature multi-effect concentration device is communicated with the multi-effect evaporation concentration device; a sulfuric acid outlet end of the multi-effect evaporation concentration device is communicated with the sulfuric acid recovery pipeline, and an alkali outlet end of the multi-effect evaporation concentration device is communicated with the evaporation concentration device; the alkali outlet end communicated with the evaporation concentration device is communicated with the alkali recovery pipeline. By adopting the system disclosed by the utility model, the regeneration and recovery rate of acid and alkali in the viscose waste liquid is improved.

Method for recovering acid and alkali from viscose sodium sulfate waste liquor through bipolar membrane electrodialysis way

The invention discloses a comprehensive treatment method of a special-type molecular sieve synthesis mother solution. The special-type molecular sieve synthesis mother solution is a mother solution containing silicates and a quaternary ammonium hydroxide template agent. The method comprises the following steps: prefiltering the special-type molecular sieve synthesis mother solution with a tubular ceramic membrane with the pore size of 0.1-1.2 mu m, adding acid to regulate the pH value to 7-8, carrying out primary filtration with a suspended-bag centrifugal machine, regulating the pH value of the filtrate to 5-6, stirring, flocculating, carrying out secondary filtration with the suspended-bag centrifugal machine, standing the filtrate, carrying out precision filtration by using a tubular ceramic membrane with the pore size of 10-50 nm, treating the filtrate with a bipolar membrane electrodialysis system to respectively obtain a quaternary ammonium hydroxide pure product water solution corresponding to the quaternary ammonium hydroxide template agent contained in the mother solution wastewater and a sulfuric acid solution. The method can effectively solve the problem of ammonia nitrogen pollution caused by discharge of the special-type molecular sieve synthesis mother solution, and can obtain the high-grade template agent of tetrapropyl ammonium hydroxide or any other quaternary ammonium hydroxide while recovering the available silicon source in the mother solution.

Comprehensive treatment method of special-type molecular sieve synthesis mother solution

Method and system for recovering waste water generated in carbocisteine production

The invention relates to a process for treating amantadine bromination waste water and mineral acid and alkali recycling through a bipolar membrane electrodialysis process, which comprises the following steps: firstly, filtrating bromination waste water through micropore filtration film; then pumping the bromination waste water into a salt chamber of the bipolar membrane electrodialysis device, pumping tap water into an acid chamber and an alkali chamber of the bipolar membrane electrodialysis device, and pumping Na2SO4 solution into electrode liquid of the two ends of the bipolar membrane electrodialysis device; and finally, starting the bipolar membrane electrodialysis device and recycling the acid and the alkali. According to the invention, a bipolar membrane electrodialysis technology is used for the treatment of degradation-resistant amantadine bromination waste water, and realizes the recycle of the mineral acid and the alkali in waste water. The process has the following advantages: bromine irons in waste water containing bromine can be removed, the desalination rate is higher than 95 percent, the hydrogen ion concentration is decreased from 2.95 mol/L to 0.003 mol/L below, and avoids secondary contamination; the process enables the degradation-resistant pharmaceutical wastewater to become biochemical degradable organic wastewater, and emits qualified waste water after the biochemical treatment; and the control effectiveness is good, the operation is convenient, and the process has a favorable application prospect.

Process for treating amantadine bromination waste water and mineral acid and alkali recycling through bipolar membrane electrodialysis process

The invention relates to a method for preparing high-purity tetrabutyl ammonium hydroxide by continuous electrolysis, particularly relates to a method for preparing high-purity tetrabutyl ammonium hydroxide by using tetrabutyl ammonium bromide as a raw material and adopting a three-compartment bipolar membrane electrodialysis device, and belongs to the field of organic chemistry. The method is characterized by comprising the following step: by adopting the three-compartment bipolar membrane electrodialysis device, continuously preparing 5-20% tetrabutyl ammonium hydroxide by using a 15-35% tetrabutyl ammonium bromide aqueous solution as a raw material under the condition that the reaction temperature is 30-60 DEG C, the current density is 200-600A/m and the flow rate of the raw materials is 500-2000L/h, wherein the concentration of bromine ions in the prepared tetrabutyl ammonium hydroxide is less than 100ppm. According to the method provided by the invention, the materials in the compartments are relatively constant in concentration, the temperature is relatively constant, an ionic membrane is not easy to swell or shrink, the membrane cost is saved, the current efficiency and the product conversion ratio are improved and the energy consumption is reduced, and moreover, the product quality is further improved. The method is suitable for industrial safe production on a large scale, clean in production process and free of discharge of wastewater and solid wastes.

Method for preparing high-purity tetrabutyl ammonium hydroxide by continuous electrolysis

The invention discloses a method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis, and the method comprises the following steps of: using a tetrapropyl ammonium bromide aqueous solution as a raw material, processing the tetrapropyl quaternary ammonium salt aqueous solution through a microporous filter, and then enabling the processed tetrapropyl quaternary ammonium salt aqueous solution to enter a material liquid room of a bipolar membrane electrodialyzing device, respectively adding water in an acid room and an alkali room, respectively adding a sodium sulfate solution in pole liquid rooms, controlling the current density, the voltage and the temperature of the bipolar membrane electrodialyzing device to be 150-600 A/M2, 20-300 V and 5-45DEG C respectively, carrying out circulating cooling through chilled saline water in a circulating coil pipe by using an electrodialyzing compartment in a running process, stopping running when the conductivity of the material liquid room is decreased to below 2000 [mu]s/cm, obtaining a tetrapropylammonium hydroxide solution in the alkali room, and recycling a hydrobromic acid solution in the acid room. By using the method, the raw material cost is low; the selectivity is multiple; the purity of the tetrapropyl ammonium hydroxide is high; hydrobromic acid further can be recovered; and the generation of a pollutant in the process is effectively avoided.

Method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis

The invention discloses a method for preparing aminopropanol by bipolar membrane electrodialysis. The method comprises the steps that: aminopropanol sulphate water solution is used as a raw material and enters a material liquid chamber of a bipolar membrane electrodialysis device after being treated by a microporous filter, meanwhile, sulphuric acid water solution with the mass concentration being 0.1 percent is added into an acid chamber, sulphuric acid water solution with the mass concentration being 0.4 percent is added into a pole liquid chamber, the current density of the bipolar membrane electrodialysis device is controlled to be 50 to 800 A/m , the voltage is 20 to 200V, the temperature is 5 to 40 DEG C, an electrodialysis separation chamber carries out circulation cooling through frozen brine in a circulation coil pipe in the operation process, when the electrical conductivity of the material liquid chamber is reduced to 2000mus/cm, the operation is stopped, the material liquid chamber and the acid chamber respectively obtain aminopropanol water solution and sulphuric acid water solution, and the aminopropanol water solution is concentrated to obtain aminopropanol. When the bipolar membrane electrodialysis technology is adopted for preparing the aminopropanol, the production period is short, the aminopropanol recovery rate is high, the energy consumption is obviously reduced, and the sulphuric acid quality is high.

Jiangnan Shen

Papers

Method for preparing tetrapropyl ammonium hydroxide by utilizing bipolar membrane electrodialysis

Method for preparing aminopropanol by bipolar membrane electrodialysis