CN1386928A - Process for reclaiming sodium hydroxide from black pulping liquor - Google Patents
Process for reclaiming sodium hydroxide from black pulping liquor Download PDFInfo
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- CN1386928A CN1386928A CN 02123600 CN02123600A CN1386928A CN 1386928 A CN1386928 A CN 1386928A CN 02123600 CN02123600 CN 02123600 CN 02123600 A CN02123600 A CN 02123600A CN 1386928 A CN1386928 A CN 1386928A
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- naoh
- black liquor
- sodium
- water solution
- paper
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Abstract
A process for reclaiming the black paper-making liquor and recovering sodium hydroxide includes filtering to remove fibres and impurities, electrolyzing to botain sodium hydroxide and hydrochloric acid, precipitating, filtering, returning sodium hydroxide back to pulping step, and using hydrochloric acid to neutralize the filtered block liquor. Its advantages are high effect, low cost and no pollution.
Description
Technical field
The present invention relates to the method for the recovery and reuse of NaOH in a kind of paper-making pulping black liquor, belong to papermaking
Technical field.
Background technology
Have a large amount of NaOH and fiber and small amount of impurities in the paper-making pulping black liquor.The recovery method more complicated of present NaOH; capital expenditure is big; the operating cost height; alkali recovery is low; environmental pollution is serious; the expense of at present improvement of black liquor being invested has surpassed the investment cost of paper according to investigations, and therefore many enterprises are restricted the development of papermaking owing to impotentia is invested the crisis that environmental protection treatment faces stopping production.
Summary of the invention
Purpose of the present invention is the shortcoming and deficiency in order to overcome above-mentioned prior art just, but and provide the method for the recovery and reuse of NaOH in a kind of closed cycle, simple, the free of contamination paper-making pulping black liquor of method, thereby make paper industry greatly reducing investment aspect the improvement black liquor, also reduced production cost.
The objective of the invention is to realize by following technical proposal:
The method of the recovery and reuse of NaOH in the paper-making pulping black liquor, after it is characterized in that black liquor removed by filter fiber and impurity, the hydrochloric acid that obtains with the electrolytic hydrogen production sodium oxide molybdena stirs and is neutralized to PH=6.5-7.5, generate sodium-chloride water solution, and then with sodium-chloride water solution with conventional method precipitation or filter further and purify, carry out electrolysis behind the sodium-chloride water solution that is purified again according to a conventional method, the NaOH that obtains regenerating, chlorine and hydrogen, the NaOH of regeneration returns paper-making pulping, the black liquor that chlorine and hydrogen salt manufacturing acid are returned after the filtration again neutralizes, and forms closed cycle and reclaims NaOH and utilization again.
Owing to take technique scheme, make that compared with the prior art the technology of the present invention has that capital expenditure is little, operating cost is low, method simply, not outsourcing NaOH, externally discharged waste water, pollution-free not, can reduce the advantage and the effect of paper cost.
The specific embodiment
Embodiment 1
Get 1 cubic metre of the black liquor of pulp making in so-and-so paper mill, contain NaOH 30g/l, after black liquor removed by filter fiber and impurity, the hydrochloric acid that obtains with this factory's electrolytic hydrogen production sodium oxide molybdena stirs and is neutralized to PH=6.5 ± 0.1, further purify the sodium-chloride water solution that is purified with filter method again after generating sodium-chloride water solution, carry out electrolysis more according to a conventional method, the NaOH 27kg that obtains regenerating, chlorine and hydrogen, the NaOH of regeneration returns and is used for paper-making pulping, black liquor neutralization after chlorine and hydrogen salt manufacturing acid are used to filter forms closed cycle and reclaims NaOH and utilization again.
Embodiment 2
Get 1 cubic metre of the black liquor of pulp making in so-and-so paper mill, contain NaOH 40g/l, after black liquor removed by filter fiber and impurity, the hydrochloric acid that obtains with this factory's electrolytic hydrogen production sodium oxide molybdena stirs and is neutralized to PH=7.0 ± 0.1, further purify the sodium-chloride water solution that is purified with filter method again after generating sodium-chloride water solution, carry out electrolysis more according to a conventional method, the NaOH 36kg that obtains regenerating, chlorine and hydrogen, the NaOH of regeneration returns and is used for paper-making pulping, black liquor neutralization after chlorine and hydrogen salt manufacturing acid are used to filter forms closed cycle and reclaims NaOH and utilization again.
Embodiment 3
Get 1 cubic metre of the black liquor of pulp making in so-and-so paper mill, contain NaOH 50g/l, after black liquor removed by filter fiber and impurity, the hydrochloric acid that obtains with this factory's electrolytic hydrogen production sodium oxide molybdena stirs and is neutralized to PH=7.5 ± 0.1, further purify the sodium-chloride water solution that is purified with intermediate processing again after generating sodium-chloride water solution, carry out electrolysis more according to a conventional method, the NaOH 45kg that obtains regenerating, chlorine and hydrogen, the NaOH of regeneration returns and is used for paper-making pulping, black liquor neutralization after chlorine and hydrogen salt manufacturing acid are used to filter forms closed cycle and reclaims NaOH and utilization again.
Claims (1)
1. the method for the recovery and reuse of NaOH in the paper-making pulping black liquor, after it is characterized in that black liquor removed by filter fiber and impurity, the hydrochloric acid that obtains with the electrolytic hydrogen production sodium oxide molybdena stirs and is neutralized to PH=6.5-7.5, generate sodium-chloride water solution, and then with sodium-chloride water solution with conventional method precipitation or filter further and purify, carry out electrolysis behind the sodium-chloride water solution that is purified again according to a conventional method, the NaOH that obtains regenerating, chlorine and hydrogen, the NaOH of regeneration returns paper-making pulping, the black liquor that chlorine and hydrogen salt manufacturing acid are returned after the filtration again neutralizes, and forms closed cycle and reclaims NaOH and utilization again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02123600 CN1386928A (en) | 2002-07-05 | 2002-07-05 | Process for reclaiming sodium hydroxide from black pulping liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02123600 CN1386928A (en) | 2002-07-05 | 2002-07-05 | Process for reclaiming sodium hydroxide from black pulping liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1386928A true CN1386928A (en) | 2002-12-25 |
Family
ID=4745168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02123600 Pending CN1386928A (en) | 2002-07-05 | 2002-07-05 | Process for reclaiming sodium hydroxide from black pulping liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1386928A (en) |
-
2002
- 2002-07-05 CN CN 02123600 patent/CN1386928A/en active Pending
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |