Ionic liquid filtering and recycling method

A process method and ionic liquid technology, applied in the field of filtration and recovery of new materials, using diatomaceous earth to filter and recover ionic liquids, can solve the problems of difficult filtration and recovery of high-viscosity ionic liquids, achieve light film color, increase filtration speed, and solve Difficult effect of filtration recovery

Active Publication Date: 2015-04-22
山东中科恒联生物基材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a process for filtering and reclaiming ionic liquids, which realizes the following invention objectives: the filtering speed of ionic liquids is greatly improved, and the filtered ionic liquids have fewer impurities, are clear and transparent, and The color of the membrane is light, and the degree of polymerization remains unchanged from that before filtration, which solves the current technical problem of difficult filtration and recovery of high-viscosity ionic liquids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A process for filtering and recovering ionic liquids, comprising the following steps:

[0026] 1. Preparation of diatomite pre-coating

[0027] Add 200-mesh diatomite with a permeability of 12 Darcy to the pre-coating tank, prepare a diatomite solution with a mass concentration of 3% with ionic liquid, pass the diatomite solution through a closed plate filter, and put it on the filter plate. Diatomite coating is formed on the surface, and the amount of diatomite is 1.5kg / m 2 .

[0028] 2. Filter

[0029] The ionic liquid with a concentration of 90%, a temperature of 25°C, and a viscosity of 100mpa.s is filtered through the closed plate filter in step 1. The filtration speed is 2-3t / h, and the filtration pressure is 0-0.4MPa, which greatly improves the Filtration rate of ionic liquids.

[0030] The turbidity of the filtered ionic liquid was determined to be 20 degrees, and the filtered ionic liquid was concentrated for a dissolution and film pulling test. After the f...

Embodiment 2

[0033] A process for filtering and recovering ionic liquids, comprising the following steps:

[0034] 1. Preparation of diatomite pre-coating

[0035] Add 600-mesh diatomite with a permeability of 12 Darcy to the pre-coating tank, prepare a diatomite solution with a mass concentration of 3% with ionic liquid, pass the diatomite solution through a closed plate filter, and put it on the filter plate. Diatomite coating is formed on the surface, and the amount of diatomite is 1.5kg / m 2 .

[0036] 2. Filter

[0037] The ionic liquid with a mass concentration of 90%, a temperature of 25°C, and a viscosity of 100mpa.s is filtered through the closed plate filter in step 1. The filtration speed is 2-3t / h, and the filtration pressure is 0-0.4MPa, which greatly improves the filtration rate of ionic liquids.

[0038] The turbidity of the filtered ionic liquid was determined to be 100 degrees, the filtered ionic liquid was concentrated, and the dissolution and film pulling test was don...

Embodiment 3

[0041] A process for filtering and recovering ionic liquids, comprising the following steps:

[0042] 1. Preparation of diatomite pre-coating

[0043] Add 200-mesh diatomite with a permeability of 12 Darcy to the pre-coating tank, prepare a diatomite solution with a mass concentration of 3% with ionic liquid, pass the diatomite solution through a closed plate filter, and put it on the filter plate. Diatomite coating is formed on the surface, and the amount of diatomite is 1.5kg / m 2 .

[0044] 2. Filter

[0045] The ionic liquid with a mass concentration of 90%, a temperature of 80°C, and a viscosity of 40mpa.s is filtered through the closed plate filter in step 1. The filtration speed is 2-3t / h, and the filtration pressure is 0-0.4MPa, which greatly improves the filtration rate of ionic liquids.

[0046] The turbidity of the filtered ionic liquid was measured to be 50 degrees, and the filtered ionic liquid was concentrated, and the film dissolution test was done. After the...

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Abstract

The invention discloses an ionic liquid filtering and recycling method. Kieselguhr serves as the filtering medium to recycle and filter ionic liquid, and the method comprises the steps of preparation and filtration of a kieselguhr precoated layer. The kieselguhr precoated layer preparing method comprises the steps that kieselguhr solution is prepared with 200-600-mesh kieselguhr and ionic liquid, and then a kieselguhr coating is formed through a filter. During kieselguhr precoated layer filtration, high-viscosity ionic liquid is filtered through the filter by which the kieselguhr coating is formed. By the adoption of the method, ionic liquid filtering speed is increased greatly, filtered ionic liquid contains fewer impurities and is clear and colorless, membrane color is light, and the technical problem that high-viscosity ionic liquid is hard to filter and recycle currently is solved.

Description

technical field [0001] The invention relates to a process method for filtering and recovering new materials, in particular to a process method for using diatomite to filter and recover ionic liquid, and belongs to the field of ionic liquid filter recovery. technical background [0002] At present, there are many reports on the use of diatomite for filtration at home and abroad, such as filtering beer, fruit juice drinks and waste oil, etc., but there is no report about using diatomite to filter high-viscosity materials, especially for filtering high-viscosity ionic liquids. . [0003] Ionic liquid is a new type of imidazole organic molten salt, which can be used to dissolve cellulose and spray cellulose film, which is composed of organic cations and inorganic anions. Diatomaceous earth can only filter liquid materials with very low viscosity. For ionic liquids, the viscosity of ionic liquids changes greatly with the change of temperature and concentration, especially high-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D37/02
Inventor 李军波张晓煜贾峰伟许丽丽张东光薛玉崔增亮
Owner 山东中科恒联生物基材料有限公司
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