Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid

A technology of papermaking black liquor and recycling method, which is applied in chemical instruments and methods, regeneration of sulfite waste liquor, silica, etc., and can solve the problem of no space to be used, high energy consumption, and secondary acidity of the acid precipitation lignin process Wastewater pollution and other issues, to achieve the effect of reducing process energy consumption

Inactive Publication Date: 2014-06-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the traditional alkali recovery method has the problem of low alkali recovery rate and high energy consumption, and the acid analysis lignin method has the problem of secondary acid wastewater pollution, while the coagulation method only provides a simple idea of ​​pollution control. The chemical method is essentially only an improvement on the traditional alkali recovery method. As for the extraction of organic matter in black liquor to prepare building material bonding enhancers and sulfonated lignin, due to the large amount of black liquor, there is no wide use space, so the above methods are all Not to mention the full utilization of the components of papermaking black liquor

Method used

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  • Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid
  • Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid
  • Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Take 3L of straw pulp papermaking black liquor and 660g of carbon powder and mix it in a 5L pressure reaction kettle, seal it, start stirring, program the temperature, and when the temperature reaches 100 °C, introduce 1.7MPa CO 2 Gas, continue to heat up to the set temperature of 200 °C, after hydrothermal reaction for 3 hours, cool down and discharge, filter, and send the solid phase (first-stage hydrothermal carbonized material) to the tube furnace reactor (protected by nitrogen atmosphere) and carbonize at 400 °C 1h, take 500g of carbon powder and return it to the first-level hydrothermal carbonization step for use. The remaining carbon powder is continuously heated to 850 °C in the tubular furnace reactor for physical activation by steam for 80min to obtain 260g of crude activated carbon, and 120g is used for the second-level hydrothermal treatment. In the carbonization process, the remaining crude activated carbon was washed with 500 mL of 5% dilute alkaline soluti...

Embodiment 2

[0044] Take 4L of straw pulp papermaking black liquor and 900g of carbon powder and mix it in a 5L pressure reaction kettle, seal it, start stirring, and program the temperature. When the temperature reaches 100 °C, 1.6MPa CO is introduced. 2 Gas, continue to heat up to the set temperature of 200 ℃, after the hydrothermal reaction for 3.5 hours, cool down and discharge, filter, and send the solid phase (first-level hydrothermal carbonization material) to the tube furnace reactor (protected by nitrogen atmosphere) at 400 ℃ After carbonization for 1.2 hours, 680 g of carbon powder was returned to the first-level hydrothermal carbonization step for use. The remaining carbon powder was continuously heated to 870 °C in the tubular furnace reactor and was physically activated by steam for 70 minutes to obtain 350 g of coarse activated carbon, and 160 g of it was used for the second stage. In the hydrothermal carbonization process, the remaining crude activated carbon was washed with ...

Embodiment 3

[0046] Take 3.5L of straw pulp papermaking black liquor and 780g of carbon powder and mix it in a 5L pressure reaction kettle, seal it, start stirring, program the temperature, and when the temperature reaches 100 °C, introduce 1.8MPa CO 2 Gas, continue to heat up to the set temperature of 200 °C, after hydrothermal reaction for 3 hours, cool down and discharge, filter, and send the solid phase (first-stage hydrothermal carbonized material) to the tube furnace reactor (protected by nitrogen atmosphere) and carbonize at 410 °C 1.3h, take 590g of carbon powder and return it to the first-level hydrothermal carbonization step for use. The remaining carbon powder is continuously heated to 830 °C in the tubular furnace reactor for physical activation by steam for 90min to obtain 310g of crude activated carbon, and 140g is used for secondary water. In the thermal carbonization process, the remaining crude activated carbon was washed with 580 mL of 5% dilute alkali solution, washed wit...

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Abstract

The invention relates to paper making industry clean production, in particular to an alkali recovery method based on paper making black liquid. The method comprises the following steps of: 1) adding carbon powder in paper making black liquid, introducing CO2 gas for carrying out primary hydrothermal carbonization, and carrying out filtering to obtain primary hydrothermal carbonization liquid and primary hydrothermal carbonization materials; 2) adding crude activated carbon into the primary hydrothermal carbonization liquid obtained in the first step, carrying out secondary hydrothermal carbonization under the CO2 gas introduction condition, carrying out filtering to obtain secondary hydrothermal carbonization liquid and secondary hydrothermal carbonization materials, evaporating the secondary hydrothermal carbonization liquid, regulating the pH (Potential Of Hydrogen), and carrying out causticization treatment to obtain alkali liquid. The method provided by the invention has the advantages that because the alkali recovery work procedure is a bottle neck of most alkali process pulp making paper making plants in prior art, after the efficiency of the process is improved, the pulp making capability of the paper making plants can be greatly improved, meanwhile, the by-production of high-added-value activated carbon and white carbon black can be realized, and further, the scale benefits of the paper making enterprises can be integrally improved.

Description

technical field [0001] The invention relates to clean production in the papermaking industry, in particular, the present invention relates to an alkali recovery method based on papermaking black liquor, a high temperature and medium pressure liquid phase acidification treatment of the papermaking black liquor, and by-producing high value-added activated carbon and silica products A new method for alkali recovery. Background technique [0002] The pollution of the paper industry to the environment, especially the water environment, has attracted worldwide attention. At present, the waste water pollution of the paper industry has been recognized as one of the "six major" public hazards in the world. At present, the environmental pollution of cooking black liquor in the alkaline pulping and papermaking industry is the most serious, accounting for about 90% of the pollution in the entire papermaking industry. About 1 / 3 of the polluting impurities contained in the black liquor ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/02C01B31/10C01B33/12C01B32/336
Inventor 张金平王云山杨刚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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