A method for preparing lignin-based cationic organic flocculant from papermaking sludge

An organic flocculant, papermaking sludge technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor flocculation effect, etc., and achieve the effect of less equipment requirements, easy availability of raw materials, and high flocculation effect.

Active Publication Date: 2015-09-09
SHANDONG UNIV
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Problems solved by technology

Chinese patent document CN102583684A discloses a method for preparing a flocculant from papermaking sludge. The method uses papermaking sludge to extract lignin and acrylamide graft copolymerization to form a flocculant, and finally obtains a lignin-acrylamide flocculant (L- AM), after measurement, the potential is between -10mV and the isoelectric point. In the actual application process, due to the low potential of the flocculant, the flocculation effect is poor. If a better flocculation effect is achieved, other substances need to be added for compounding
[0005] After searching, there is no report on the related technology of synthesizing cationic organic flocculants by using papermaking sludge as raw material and using ethylenediamine crosslinking method

Method used

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  • A method for preparing lignin-based cationic organic flocculant from papermaking sludge
  • A method for preparing lignin-based cationic organic flocculant from papermaking sludge
  • A method for preparing lignin-based cationic organic flocculant from papermaking sludge

Examples

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Embodiment 1

[0032] Example 1. Preparation of flocculants (L-N) with different pH

[0033] Weigh 2.0g of papermaking sludge, add 60ml of deionized water and 1mol / L NaOH solution, stir to stabilize the pH at 11.5, centrifuge at 8000rpm for 15min, take the supernatant, adjust the pH to 3.5, 5.5, 7.5, 9.5, Put the reactor in a constant temperature water bath at 70°C, stir for 5 minutes, add 8ml of N,N-dimethylformamide and 8ml of epichlorohydrin into the reactor, and stir for 1 hour at a speed of 200rpm. The reaction is The first stage reaction; then slowly add 3ml of ethylenediamine dropwise, and then react for 1h, this reaction is the second stage reaction; finally drop 10ml triethylamine, react for 2h, this reaction is the third stage reaction; Cool the product to room temperature, add 200ml of acetone to precipitate the product, pressurize 0.015MPa to vacuum filter, and vacuum-dry the filter residue at 60°C to obtain four products with different reaction pHs. The products prepared with p...

Embodiment 2

[0034] Example 2. Preparation of flocculants (L-N) with different additions of N,N-dimethylformamide and epichlorohydrin

[0035] The same as described in Example 1, the difference is that the pH of the supernatant is adjusted to 5.5, and the addition amounts of N,N-dimethylformamide and epichlorohydrin are respectively 6ml, 8ml, 10ml, and 12ml, to obtain The flocculant products with different addition amounts of N,N-dimethylformamide and epichlorohydrin, the addition amounts of N,N-dimethylformamide and epichlorohydrin are 6ml, 8ml, 10ml, and 12ml respectively. The products are respectively denoted as 1#, 2#, 3#, 4# flocculant of embodiment 2.

Embodiment 3

[0036] Example 3. Preparation of flocculants (L-N) with different reaction times in the first stage

[0037] The same as described in Example 2, the difference is that the addition amount of N,N-dimethylformamide and epichlorohydrin is 8ml, that is, the flocculant products with different reaction times in the first stage are obtained. The reaction time is 30min, 45min, 60min, 75min respectively, and the obtained products are respectively recorded as 1#, 2#, 3#, 4# flocculants of Example 3.

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Abstract

The invention relates to a method of preparing a lignin-based positive ion organic flocculant by using paper mill sludge. The method comprises the following steps: extracting a raw material and directly dissolving by alkali liquor; carrying out centrifugal separation to obtain supernate; adjusting the pH of the solution; placing the adjusted solution in a reactor and heating to a certain temperature; sequentially adding N,N-dimethylformamide epoxy chloropropane, ethanediamine and triethylamine; and stirring to react. According to the method provided by the invention, a quantity of amino radicals with positive charges are introduced through an ethanediamine crosslinking method to change the charge electrical property of alkali lignin, so that the potential of the prepared flocculant is +20 to 35mV and the flocculant is positive ion type, and the zeta potential is high, the flocculation efficiency is high, and the addition is about 2mg / l. Therefore, the UV254 removal rate and the DOC removal rate respectively reach 80% and 65% without adding other compounding agents. Meanwhile, paper mill sludge is recycled, so that the paper industry is in sustainable development.

Description

technical field [0001] The invention relates to a method for synthesizing a lignin-based cationic organic flocculant by using papermaking sludge produced in an alkaline papermaking process as a main raw material, and belongs to the technical field of waste resource utilization and water treatment flocculants. technical background [0002] After the emergence of my country's water resource pollution problem, a variety of sewage treatment methods have emerged as the times require, and have experienced a process of rapid development. Coagulation and sedimentation method is currently a treatment method used to improve water quality in the field of domestic water industry and water pollution control engineering technology. It has the advantages of economic convenience and easy operation. The innovation of water treatment technology, the simplification of process flow, the reduction of operating cost, etc., depend to a large extent on the performance of coagulant. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/54
Inventor 高宝玉李瑞华于欢宋雯岳钦艳
Owner SHANDONG UNIV
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