Device and method for extracting and separating lignin in papermaking black liquor

A technology for papermaking black liquor and lignin, which is applied in the regeneration of lye and other directions, can solve the problems of large amount of acid-extracted foam, less extraction amount, slow lignin extraction speed, etc. Extract the effect of the separation effect

Inactive Publication Date: 2013-10-09
NANJING UNIV
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  • Abstract
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Problems solved by technology

However, the traditional acid analysis method has disadvantages such as large amount of acid analysis foam, slow lignin extraction speed, and less extraction amount.

Method used

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  • Device and method for extracting and separating lignin in papermaking black liquor

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with drawings and embodiments.

[0035] Such as figure 1 As shown, the device for extracting and separating lignin from papermaking black liquor of the present invention mainly includes an acid analysis flocculation zone 8 , a blocking bucket 5 and a separation zone 10 .

[0036]The acid analysis flocculation zone 8 has a barrel-shaped main body and a conical bottom. Its upper part is open, and the bottom of the lower cone is provided with a separation liquid outlet. The separation liquid outlet is connected to the separation liquid conduit 9 leading the separation liquid out of the device.

[0037] The opening of the blocking bucket 5 is downward, and the upper opening end of the acid analysis flocculation zone 8 is tightly and flexibly connected with the lower opening end of the blocking bucket 5, so that water or black liquor will not flow out or seep out from the connection.

[0038] There are als...

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Abstract

The invention discloses a device and a method for extracting and separating lignin in papermaking black liquor. The device mainly comprises an acidification and flocculation area (8), a stop barrel (5) and a separation area (10). The device integrates acidification, defoaming and flocculation into a whole; because of the layout of the separation area, tight and movable connection between the stop barrel and the acidification and flocculation area and setting of pores, a large amount of lignin in the papermaking black liquor can be quickly and efficiently extracted and separated, and the extraction quantity of the lignin is improved; and the lignin can be quickly acidified by fully mixing a composite solution and the papermaking black liquor, and larger floccule is formed by adding polyacrylamide (PAM) serving as a coagulant aid so as to better separate the lignin. The invention overcomes the defects of the conventional acidification method, and has broader application prospect.

Description

technical field [0001] The invention belongs to the field of papermaking wastewater treatment, in particular to a method and device for extracting and separating lignin from papermaking black liquor by means of acid analysis and flocculation. Background technique [0002] The paper industry is seriously polluted, and the wastewater discharge accounts for more than 10% of the total industrial wastewater in the country, among which black liquor is the most harmful to the environment. Papermaking black liquor contains a large amount of lignin, accounting for 1% to 2% of the total waste liquor. Lignin is not easy to degrade under natural conditions and reduces the transparency of water, making papermaking wastewater difficult to treat. However, lignin is an important industrial raw material, which is widely used to produce plant growth regulators, petroleum emulsifiers, pesticide auxiliaries, equipment corrosion inhibitors, etc., so how to recover lignin from papermaking black l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/04C08H7/00
Inventor 孙亚兵张艳徐建华边琳
Owner NANJING UNIV
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