CN103723746A - Preparation method for producing anhydrous sodium sulfate with 2,7-dihydroxy naphthalene mother liquid - Google Patents
Preparation method for producing anhydrous sodium sulfate with 2,7-dihydroxy naphthalene mother liquid Download PDFInfo
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- CN103723746A CN103723746A CN201310615815.6A CN201310615815A CN103723746A CN 103723746 A CN103723746 A CN 103723746A CN 201310615815 A CN201310615815 A CN 201310615815A CN 103723746 A CN103723746 A CN 103723746A
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Abstract
The invention discloses a preparation method for producing anhydrous sodium sulfate with 2,7-dihydroxy naphthalene mother liquid. The preparation method comprises the following steps: adjusting the pH value of 4000 to 4300 kilograms of 2,7-dihydroxy naphthalene mother liquid to 2 with 10-13 kilograms of 98% sulfuric acid; adding 20 kilograms of activated charcoal for filtering at the temperature of 50 DEG C; lowering the temperature of the filtrate to 10 DEG C, and centrifuging to obtain 1700-1900 kilograms of sodium sulfate decahydrate; raising the temperature of the sodium sulfate decahydrate to 90 DEG C, then lowering the temperature to 80 DEG C, and centrifuging to obtain 430-480 kilograms of anhydrous sodium sulfate; adding 5-6 kilograms of sodium hydroxide into the centrifuged mother liquid to adjust the pH value to 9; adding 20 kilograms of activated charcoal for filtering at the temperature of 75 DEG C-78 DEG C; raising the temperature of the filtrate and concentrating the filtrate to enable the concentrated amount of the filtrate to be two third of the residual filtrate; centrifuging at the temperature of 80 DEG C to obtain 270-290 kilograms of anhydrous sodium sulfate; lowering the temperature of the centrifuged mother liquid to 10 DEG C, and re-centrifuging to obtain sodium sulfate decahydrate. The preparation method is simple in technology, low in cost, and pollution-free.
Description
Technical field
The invention belongs to chemical field, particularly a kind of preparation method who utilizes 2,7 dihydroxy naphthalene mother liquor production anhydrous sodium sulphate.
Background technology
In prior art, the producing of industrial anhydrous sodium sulfate, is mainly at present to take complete molten dehydration by evaporation method that natural mirabilite ore is raw material and take salt lake brine as waste industrial anhydrous sodium sulfate.Raw material is different, but production method great majority are all to adopt two-step process flow process, the double salt that the first step is separated out saltcake or contained sodium sulfate, and second step is processed into finished product by the saltcake after selected.According to production anhydrous sodium sulphate above, its synthetic method cost is too high, not easy to operate, and produces a large amount of waste water, is unfavorable for suitability for industrialized production.
Summary of the invention
Recklessly not enough for above-mentioned prior art, the invention provides a kind of preparation method who utilizes 2,7 dihydroxy naphthalene mother liquor production anhydrous sodium sulphate, the method technique is simple, less investment, instant effect, non-secondary pollution, increase product innovation, realize the object of circulation, cleaner production.
The present invention recklessly technical scheme is: a kind of preparation method who utilizes 2,7 dihydroxy naphthalene mother liquor production anhydrous sodium sulphate, is characterized in that: comprise the following steps:
Step 1: it is 2 that 4000-4300 kilogram of 2,7 dihydroxy naphthalene mother liquor is transferred to pH value with 10-13 kilogram of 98% sulfuric acid, adds 20 kilograms of gacs in 50 ℃ of filtrations;
Step 2: filtrate is cooled to 10 ℃, centrifugal 1700-1900 kilogram of sal glauberi;
Step 3, heats up above-mentioned sal glauberi 90 ℃, then is cooled to 80 ℃ of centrifugal 430-480 kilogram of anhydrous sodium sulphate;
Step 4: add the pH value of 5-6 kilogram of sodium hydroxide to be transferred to 9 above-mentioned centrifuge mother liquor, add 20 kilograms of gacs in 75 ℃ of-78 ℃ of filtrations;
Step 5: filtrate is heated up concentrated, is concentrated into 2/3rds of residual filtrate, 80 ℃ of temperature centrifugal 270-290 kilogram of anhydrous sodium sulphate;
Step 6: the mother liquor obtaining after centrifugal is cooled to after 10 ℃, and recentrifuge obtains sal glauberi, is circulated to step 2 and continues to use.
Advantageous effect of the present invention: this utilizes the preparation method of 2,7 dihydroxy naphthalene mother liquor production anhydrous sodium sulphate, technique is simple, less investment, instant effect, non-secondary pollution, increase product innovation, realize the object of circulation, cleaner production, by the improvement to technique, easier industrialized mass production.There is remarkable, continuable economy, ecotope and social benefit.
Embodiment
Example one
Step 1: it is 2 that 4000 kilograms of 2,7 dihydroxy naphthalene mother liquors are transferred to pH value with 10 kilogram of 98% sulfuric acid, adds 20 kilograms of gacs in 50 ℃ of filtrations;
Step 2: filtrate is cooled to 10 ℃, centrifugal 1700 kilograms of sal glauberis;
Step 3, heats up above-mentioned sal glauberi 90 ℃, then is cooled to 80 ℃ of centrifugal 430 kilograms of anhydrous sodium sulphate;
Step 4: add the pH value of 5 kilograms of sodium hydroxide to be transferred to 9 above-mentioned centrifuge mother liquor, add 20 kilograms of gacs in 75 ℃ of filtrations;
Step 5: filtrate is heated up concentrated, is concentrated into 2/3rds of residual filtrate, 80 ℃ of temperature centrifugal 270 kilograms of anhydrous sodium sulphate;
Step 6: the mother liquor obtaining after centrifugal is cooled to after 10 ℃, and recentrifuge obtains sal glauberi, is circulated to step 2 and continues to use.
Example two
Step 1: it is 2 that 4300 kilograms of 2,7 dihydroxy naphthalene mother liquors are transferred to pH value with 13 kilogram of 98% sulfuric acid, adds 20 kilograms of gacs in 50 ℃ of filtrations;
Step 2: filtrate is cooled to 10 ℃, centrifugal 1900 kilograms of sal glauberis;
Step 3, heats up above-mentioned sal glauberi 90 ℃, then is cooled to 80 ℃ of centrifugal 480 kilograms of anhydrous sodium sulphate;
Step 4: add the pH value of 6 kilograms of sodium hydroxide to be transferred to 9 above-mentioned centrifuge mother liquor, add 20 kilograms of gacs in 78 ℃ of filtrations;
Step 5: filtrate is heated up concentrated, is concentrated into 2/3rds of residual filtrate, 80 ℃ of temperature centrifugal 290 kilograms of anhydrous sodium sulphate;
Step 6: the mother liquor obtaining after centrifugal is cooled to after 10 ℃, and recentrifuge obtains sal glauberi, is circulated to step 2 and continues to use.
Claims (1)
1. a preparation method who utilizes 2,7 dihydroxy naphthalene mother liquor production anhydrous sodium sulphate, is characterized in that: the described preparation method who utilizes 2,7 dihydroxy naphthalene mother liquor production anhydrous sodium sulphate, comprises the following steps:
Step 1: it is 2 that 4000-4300 kilogram of 2,7 dihydroxy naphthalene mother liquor is transferred to pH value with 10-13 kilogram of 98% sulfuric acid, adds 20 kilograms of gacs in 50 ℃ of filtrations;
Step 2: filtrate is cooled to 10 ℃, centrifugal 1700-1900 kilogram of sal glauberi;
Step 3, heats up above-mentioned sal glauberi 90 ℃, then is cooled to 80 ℃ of centrifugal 430-480 kilogram of anhydrous sodium sulphate;
Step 4: add the pH value of 5-6 kilogram of sodium hydroxide to be transferred to 9 above-mentioned centrifuge mother liquor, add 20 kilograms of gacs in 75 ℃ of-78 ℃ of filtrations;
Step 5: filtrate is heated up concentrated, is concentrated into 2/3rds of residual filtrate, 80 ℃ of temperature centrifugal 270-290 kilogram of anhydrous sodium sulphate;
Step 6: the mother liquor obtaining after centrifugal is cooled to after 10 ℃, and recentrifuge obtains sal glauberi, is circulated to step 2 and continues to use.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310615815.6A CN103723746B (en) | 2013-11-28 | 2013-11-28 | Preparation method for producing anhydrous sodium sulfate with 2,7-dihydroxy naphthalene mother liquid |
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| CN201310615815.6A CN103723746B (en) | 2013-11-28 | 2013-11-28 | Preparation method for producing anhydrous sodium sulfate with 2,7-dihydroxy naphthalene mother liquid |
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| CN103723746A true CN103723746A (en) | 2014-04-16 |
| CN103723746B CN103723746B (en) | 2014-09-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004883B1 (en) * | 1978-04-26 | 1981-09-16 | BASF Aktiengesellschaft | Process for the preparation of free-flowing inorganic ammonium and alkali salts |
| CN1594133A (en) * | 2004-07-10 | 2005-03-16 | 化学工业部连云港设计研究院 | Method for reusing contaminant separated from naphthalenesulfonic acid neutralization wash waste liquor |
| CN101161598A (en) * | 2007-08-10 | 2008-04-16 | 南京大学 | Resource method of deposed salt slag or heavy metal sewage sludge and its private facilities |
| CN102442888A (en) * | 2011-11-10 | 2012-05-09 | 丹东深兰化工有限公司 | Method for producing 1,5-dihydroxy naphthalene |
| CN103058442A (en) * | 2013-01-25 | 2013-04-24 | 甘肃银光聚银化工有限公司 | Method for processing secondary salt in desulphurization waste liquid |
-
2013
- 2013-11-28 CN CN201310615815.6A patent/CN103723746B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004883B1 (en) * | 1978-04-26 | 1981-09-16 | BASF Aktiengesellschaft | Process for the preparation of free-flowing inorganic ammonium and alkali salts |
| CN1594133A (en) * | 2004-07-10 | 2005-03-16 | 化学工业部连云港设计研究院 | Method for reusing contaminant separated from naphthalenesulfonic acid neutralization wash waste liquor |
| CN101161598A (en) * | 2007-08-10 | 2008-04-16 | 南京大学 | Resource method of deposed salt slag or heavy metal sewage sludge and its private facilities |
| CN102442888A (en) * | 2011-11-10 | 2012-05-09 | 丹东深兰化工有限公司 | Method for producing 1,5-dihydroxy naphthalene |
| CN103058442A (en) * | 2013-01-25 | 2013-04-24 | 甘肃银光聚银化工有限公司 | Method for processing secondary salt in desulphurization waste liquid |
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| CN103723746B (en) | 2014-09-03 |
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