Method for preparing corrosion and scale inhibition adsorbent by taking lignin in papermaking wastewater as raw material

A technology for corrosion and scale inhibition and papermaking wastewater, applied in chemical instruments and methods, water/sewage treatment, descaling and water softening, etc., can solve the problems of lignin resource waste, environmental pollution, environmental pollution, etc., to protect pipelines and equipment effects

Inactive Publication Date: 2020-02-21
王其芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In modern papermaking enterprises, the vast majority of lignin is burned as fuel in the process of recycling chemicals, but the calorific value of lignin is not high. The burning treatment not only causes waste of biomass resources, but also brings serious environmental problems. Pollution, and some lignin is discharged into rivers, resulting in a great waste of lignin resources, and at the same time seriously polluting the environment and destroying the ecological balance. It is an effective way to reduce resource waste and improve efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing a corrosion-inhibiting and scale-inhibiting adsorbent by using lignin in papermaking wastewater as a raw material, comprising the steps of:

[0021] (1) Take the alkaline papermaking waste liquid, add an appropriate amount of coagulant to it, then add acid to adjust the pH value to 3, control the temperature to 60°C, flocculate and stratify the waste liquid, filter and dry the filter cake at a constant temperature, grind, Obtain lignin, standby;

[0022] (2) Take 20g of lignin prepared in step (1) in a beaker, add 10g of Na 2 SO 3 and 10g of formaldehyde, and then add 10% NaOH solution to dissolve the lignin and adjust the pH value to 7, then place the beaker in the reactor and react for 3 hours at a reaction temperature of 100°C. After the reaction, the reactant is cooled , centrifuged to obtain yellow-brown sodium lignosulfonate;

[0023] (3) get the sodium lignosulfonate prepared by 100g step (2), add 350g H successively 2 O, 250g of organi...

Embodiment 2

[0029] A method for preparing a corrosion-inhibiting and scale-inhibiting adsorbent by using lignin in papermaking wastewater as a raw material, comprising the steps of:

[0030] (1) Take the alkaline papermaking waste liquid, add an appropriate amount of coagulant to it, then add acid to adjust the pH value to 4, control the temperature to 70°C, flocculate and stratify the waste liquid, filter and dry the filter cake at a constant temperature, grind it, Obtain lignin, standby;

[0031] (2) Take 20g of lignin prepared in step (1) in a beaker, add 10g of Na 2 SO 3 and 10g formaldehyde, then add 10% NaOH solution to dissolve the lignin and adjust the pH value to 8, then place the beaker in the reactor, and react for 3 hours at a reaction temperature of 100°C, and cool the reactant after the reaction , centrifuged to obtain yellow-brown sodium lignosulfonate;

[0032] (3) get the sodium lignosulfonate prepared by 100g step (2), add 450g H successively 2 O, 350g of organic pho...

Embodiment 3

[0036] A method for preparing a corrosion-inhibiting and scale-inhibiting adsorbent by using lignin in papermaking wastewater as a raw material, comprising the steps of:

[0037] (1) Take the alkaline papermaking waste liquid, add an appropriate amount of coagulant to it, then add acid to adjust the pH value to 4, control the temperature to 70°C, flocculate and stratify the waste liquid, filter and dry the filter cake at a constant temperature, grind it, Obtain lignin, standby;

[0038] (2) Get 20g of lignin prepared in step (1) in a beaker, add 20g Na 2 SO 3 and 20g formaldehyde, and then add 10% NaOH solution to dissolve the lignin and adjust the pH value to 8, then place the beaker in the reactor, and react for 3 hours at a reaction temperature of 100°C. After the reaction, the reactant is cooled , centrifuged to obtain yellow-brown sodium lignosulfonate;

[0039] (3) get the sodium lignosulfonate prepared by 100g step (2), add 450g H successively 2O, 350g of organic ph...

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Abstract

The invention discloses a method for preparing a corrosion and scale inhibition adsorbent by taking lignin in papermaking wastewater as a raw material, wherein the method comprises the following steps: (1) taking alkaline papermaking black liquor, adding a coagulant aid, adding an acid to adjust the pH value, controlling the temperature at 60-70 DEG C, flocculating and layering the waste liquor, filtering, drying, and grinding to obtain lignin; (2) putting the prepared lignin into a beaker, adding Na2SO3 and formaldehyde, then adding NaOH, putting the beaker into a reactor, carrying out a reaction, and after the reaction is finished, cooling and centrifuging to obtain sodium lignin sulfonate; and (3) taking the prepared sodium lignin sulfonate, sequentially adding H2O, organic phosphorus and zinc chloride into the prepared sodium lignin sulfonate, adding an ethanol solution of benzotriazole, putting the mixed solution into the reactor, carrying out a reaction, and cooling to obtain thecorrosion and scale inhibition adsorbent. The prepared corrosion and scale inhibition adsorbent is applied to industrial wastewater containing a large number of metal ions and corrosive substances, can play a role in corrosion and scale inhibition adsorption, protects pipelines and equipment, and adsorbs various metal ions.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for preparing a corrosion and scale inhibitor by using lignin in papermaking wastewater as a raw material. Background technique [0002] Lignin is a natural polymer, second only to cellulose in quantity, and one of the most abundant natural polymers in nature. Lignin, cellulose, and hemicellulose are the main components of plant cytoskeleton, and their content accounts for about 19-35% in wood, and about 14-24% in grass plants. Because of its good biodegradability, renewability, and environmental friendliness, it has attracted widespread attention worldwide. Pulp and paper companies around the world separate about 2.6×10 7 tons of lignin. Lignin molecules contain many functional groups such as carbonyl, methoxyl, phenolic hydroxyl, alcoholic hydroxyl, ether bonds and conjugated double bonds, which can be used to prepare a variety of functional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14C02F5/12
CPCC02F1/286C02F5/125C02F5/145C02F2303/08
Inventor 王其芬
Owner 王其芬
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