Lignin modified asphalt, preparation method therefor and applications thereof

A technology for modifying asphalt and lignin, which is applied in the field of environmental engineering research to achieve the effect of saving oil resources

Active Publication Date: 2014-04-09
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's research on lignin-modified asphalt is only at the level of basic physical modification such as the blending deg

Method used

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  • Lignin modified asphalt, preparation method therefor and applications thereof
  • Lignin modified asphalt, preparation method therefor and applications thereof
  • Lignin modified asphalt, preparation method therefor and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of lignin modified asphalt comprises the steps:

[0035] (1) Extraction of lignin

[0036] Take the papermaking black liquor, add hydrochloric acid to adjust the pH to 3.5, raise the temperature of the acidified papermaking black liquor to 80°C within 15 minutes, and then centrifuge to remove the lower layer of precipitate, repeatedly wash with deionized water until neutral, and dry at 120°C for 24 hours , to obtain crude lignin;

[0037] (2) Refining lignin

[0038] Add the crude lignin product obtained in step (1) into water, the quality of the water is 15 times that of the crude lignin product, prepare an aqueous lignin solution, place the prepared aqueous lignin solution in a reactor, adjust the pH to 2.5 with hydrochloric acid, and After stirring at 70°C for 3.5h, the filter cake was taken out by suction filtration, washed repeatedly with deionized water until neutral, and dried in an oven at 120°C for 24h to obtain refined lignin;

[0039...

Embodiment 2

[0044] The preparation method of lignin modified asphalt comprises the steps:

[0045] (1) Extraction of lignin

[0046] Take the papermaking black liquor, add hydrochloric acid to adjust the pH to 2.5, heat the acidified papermaking black liquor to 80°C within 20 minutes, then centrifuge to remove the lower layer of precipitate, wash it repeatedly with deionized water until neutral, and dry it at 120°C for 24 hours , to obtain crude lignin;

[0047] (2) Refining lignin

[0048] Add the crude lignin product obtained in step (1) into water, the quality of the water is 25 times that of the crude lignin product, prepare an aqueous lignin solution, place the prepared aqueous lignin solution in a reactor, adjust the pH to 1.5 with hydrochloric acid, and After stirring at 90°C for 2.5h, the filter cake was taken out by suction filtration, washed repeatedly with deionized water until neutral, and dried in an oven at 120°C for 24h to obtain refined lignin;

[0049] (3) Modification o...

Embodiment 3

[0054] The preparation method of lignin modified asphalt comprises the steps:

[0055] (1) Extraction of lignin

[0056] Take the papermaking black liquor, add hydrochloric acid to adjust the pH to 3, raise the temperature of the acidified papermaking black liquor to 80°C within 18 minutes, and then centrifuge to remove the lower layer of precipitate, repeatedly wash with deionized water until neutral, and dry at 120°C for 24 hours , to obtain crude lignin;

[0057] (2) Refining lignin

[0058] Add the crude lignin product obtained in step (1) into water, the quality of the water is 20 times that of the crude lignin product, prepare an aqueous lignin solution, place the prepared aqueous lignin solution in a reactor, adjust the pH to 2 with hydrochloric acid, and After stirring at 80°C for 3 hours, the filter cake was taken out by suction filtration, washed repeatedly with deionized water until neutral, and dried in an oven at 120°C for 24 hours to obtain refined lignin;

[...

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Abstract

Provided are a kind of lignin modified asphalt, a preparation method therefor and applications thereof. The modified asphalt is prepared after the following steps: first, lignin extraction is carried out; second, lignin refining is carried out; third, lignin modification is carried out; fourth, the modified lignin obtained from the third step and petroleum asphalt are placed in a reaction vessel, Na2S is added, the reaction is for 30min, and lignin modified asphalt is obtained after postprocessing. In the method, lignin is extracted from waste papermaking black liquid, asphalt is subjected to chemical modification by utilization of lignin after refining and modification, and lignin modified asphalt is obtained. The corrosion resistance of the modified asphalt is comparable to that of asphalt before modification, the elastic recovery rate of the modified asphalt is higher than that of asphalt before modification by 1.2%, the viscosity of the modified asphalt is higher than that of asphalt before modification at the same temperature, and therefore the performances of the modified asphalt is comparable to that of unmodified asphalt, so asphalt can be replaced by the lignin modified asphalt, not only petroleum resource is saved but also secondary utilization of waste papermaking black liquid is achieved.

Description

technical field [0001] The invention belongs to the field of environmental engineering research, and in particular relates to a lignin-modified asphalt and its preparation method and application. technical background [0002] Asphalt plays an important role in road construction, and most of the asphalt used in our country comes from petroleum by-products. Petroleum is a non-renewable resource, and the increasing demand for asphalt will further lead to the shortage of petroleum resources. [0003] On the other hand, my country's papermaking industry produces a large amount of papermaking black liquor every year. If the treatment of papermaking black liquor is not proper, it will have a great impact on the environment. [0004] To sum up, in order to save petroleum resources and scientifically control the environmental pollution caused by papermaking black liquor, it is of great social value to rationally use papermaking black liquor for asphalt modification. At present, my c...

Claims

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Application Information

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IPC IPC(8): C10C3/02C08H7/00
Inventor 黄靖宇李军伟
Owner HOHAI UNIV
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