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Gaseous membrane, preparation method thereof and method for preparing bromine-free or low-bromine saline water

A gaseous membrane and brine technology, applied in the field of brine debromination and gaseous membrane, can solve the problems of low bromine removal rate, large floor area, high operating cost, etc., and achieve high porosity, strong corrosion resistance, and stable operation Effect

Active Publication Date: 2021-02-05
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The control of bromine content in chlorine or the control of bromine content in isocyanate products in the above-mentioned prior art has problems such as large floor area, high operating cost, complicated process, and low bromine removal rate. Therefore, it is necessary to develop a Process method of medium bromine content

Method used

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  • Gaseous membrane, preparation method thereof and method for preparing bromine-free or low-bromine saline water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Embodiment 1 prepares ECTFE-MnO 2 Composite Modified Hollow Fiber Gas Membrane

[0084] Add 1t of ECTFE to 5t of polyethylene glycol and mix evenly, then add 0.33t of DEG and 0.25t of perfluorooctyltrichlorosilane at the same time, and stir slowly in a water bath at 50°C (stirring speed 20r / min) for 60min to obtain a clear Transparent casting solution. Under nitrogen extrusion at an external pressure of 2 barg, the casting liquid was passed through a spinning device to obtain a hollow fiber membrane, soaked in pure water for 36 hours, and then vacuum-dried at 60°C for 4 hours.

[0085] At 25°C, prepare 2t of 2.0% NH 4 HCO 3 and 3.0% MnSO 4 solution, to MnSO 4 Add 33.3 kg of perfluorooctyltrichlorosilane into the solution and fully stir to dissolve to prepare a mixed solution. NH under ultrasonic radiation environment 4 HCO 3 The solution was slowly added dropwise to the above mixed solution, the dropping time was 60min, the ultrasonic pulse frequency was 15kHz, ...

Embodiment 2

[0088] Add 1t of ECTFE to 7t of polyethylene glycol and mix evenly, add 0.5t of DEG and 0.33t of perfluorooctyltrichlorosilane at the same time, stir slowly in a water bath at 50°C (stirring speed 20r / min) for 90min, and obtain a clear and transparent casting solution. Under the extrusion of nitrogen at an external pressure of 3 barg, the casting solution was passed through a spinning device to obtain a hollow fiber membrane, soaked in pure water for 48 hours, and then vacuum-dried at 80°C for 8 hours.

[0089] At 25°C, prepare 2t of 2.0% NH 4 HCO 3 and 3.0% MnSO 4 solution, to MnSO 4 Add 50 kg of perfluorooctyltrichlorosilane into the solution and fully stir to dissolve to prepare a mixed solution. NH under ultrasonic radiation environment 4 HCO 3 The solution was slowly added dropwise to the above mixed solution, the dropping time was 90min, the ultrasonic pulse frequency was 20kHz, and the pulse width was 300ms. Crystallize at 400°C, 500°C, and 600°C for 5 hours to p...

Embodiment 3

[0092] Add 1t of ECTFE to 6t of polyethylene glycol and mix evenly, add 0.4t of DEG and 0.3t of perfluorooctyltrichlorosilane at the same time, stir slowly in a water bath at 50°C (stirring speed 20r / min) for 75min, and obtain a clear and transparent casting solution. Under nitrogen extrusion at an external pressure of 2.5 barg, the casting solution was passed through a spinning device to obtain a hollow fiber membrane, soaked in pure water for 42 hours, and then vacuum-dried at 70°C for 6 hours.

[0093] At 25°C, prepare 2t of 2.0% NH 4 HCO 3 and 3.0% MnSO 4 solution, to MnSO 4 40 kg of perfluorooctyltrichlorosilane was added into the solution and fully stirred to dissolve to prepare a mixed solution. NH under ultrasonic radiation environment 4 HCO 3 The solution was slowly added dropwise to the above mixed solution, the dropping time was 75min, the ultrasonic pulse frequency was 18kHz, and the pulse width was 220ms. After the reaction was complete, the mixed liquid was...

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Abstract

The invention discloses a gaseous membrane and a preparation method thereof, and a method for preparing bromine-free or low-bromine saline water. The gaseous membrane is a perfluorooctyltrichlorosilane modified ethylene trichlorofluoroethylene copolymer hollow fiber membrane coated with hollow porous gamma-MnO2, the microsphere size of the hollow porous gamma-MnO2 is 0.5-2.0 [mu]m, and the pore size of the hollow porous gamma MnO2 is 5-20 nm. The gaseous membrane has the advantages of strong acid and alkali resistance, strong oxidation resistance, strong corrosion resistance, high porosity, stable operation and the like. Bromine in brine is deeply removed by adopting a process technical route of light brine oxidation and gaseous membrane bromine extraction, so that the bromine content in chlorine can be reduced to be less than 50ppm from the source, the phosgenation reaction quality is improved, the content of chromophoric impurities such as brominated MDI in the product is further reduced, and the purposes of improving the color number and the quality of the product are achieved. The method is simple in process, low in operation cost and large in economic benefit, and the productquality is remarkably improved.

Description

technical field [0001] The invention relates to the field of separation and purification, in particular to a gaseous membrane and a method for debromination of brine. [0002] technical background [0003] Isocyanate is an important intermediate in the field of organic chemistry. It is widely used in polyurethane foam, rubber, elastic fiber, coating, adhesive, synthetic leather, artificial wood, etc. With its superior performance, it is widely used in high-speed rail, new energy And other emerging fields also have broad development prospects. At present, most of the methods for industrial production of isocyanate adopt phosgenation, such as the isocyanate (MDI) of the diphenylmethane series with important applications, which is prepared by condensation of aniline and formaldehyde to diphenylmethanediamine (diamine) or Polymethylene polyphenyl polyamine (polyamine), prepared by phosgenation and a series of post-treatment and separation processes, including diphenylmethane dii...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/32B01D71/02B01D69/08B01D69/02B01D67/00C02F1/44C02F101/12
CPCB01D71/82B01D71/32B01D71/024B01D69/08B01D69/02B01D67/0079C02F1/44B01D2325/30C02F2101/12
Inventor 董超赵东科周宇杰黄荐李超群文放王文博张宏科
Owner WANHUA CHEM GRP CO LTD
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