CN1277153A - Production process of anhydrous sodium sulfate - Google Patents
Production process of anhydrous sodium sulfate Download PDFInfo
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- CN1277153A CN1277153A CN 00111197 CN00111197A CN1277153A CN 1277153 A CN1277153 A CN 1277153A CN 00111197 CN00111197 CN 00111197 CN 00111197 A CN00111197 A CN 00111197A CN 1277153 A CN1277153 A CN 1277153A
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- sodium sulfate
- concentrated sulfuric
- sulfuric acid
- anhydrous sodium
- crushing
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Abstract
The anhydrous sodium sulfate producing process of direct reaction between sodium chloride and concentrated sulfuric acid includes the following steps: crushing and sieving industry salt; high temperature reaction of salt with concentrated sulfuric acid in the weight ratio of 1 to 0.7 in a reactor to produce sodium sulfate and HCl gas; and cooling and crushing produced sodium sulfate. The technological process is short, can produce high quality product in purity as high as 99-99.3%. It may produce 1.55 ton of 31% concentration hydrochloric acid while producing one ton of sodium sulfate.
Description
The invention relates to a method for industrially producing sodium sulfate, in particular to a method for producing anhydrous sodium sulfate by directly reacting sodium chloride with concentrated sulfuric acid.
The anhydrous sodium sulfate is a basic inorganic chemical product, is mainly used for manufacturing chemical products such as sodium sulfide, ultramarine, sodium silicate and the like, is used for sulfate pulp in the paper industry, is used for replacing soda ash in the glass industry, and is used as a filler in the dye industry, and the dosage is very large. In addition, anhydrous sodium sulfate is widely used in printing and dyeing, medicine, detergent, electroplating and other industries.
The traditional production method mainly comprises a mirabilite dehydration method, a high-low temperature salt conversion method, a glauberite method, a salt and nitrate co-production method and the like. The general process is basically a direct production by using the primary minerals or by-products from the production of other chemical products, and therefore has the following disadvantages: discontinuous production and low purity of finished products (generally, the content of the sodium sulfate on a dry basis is between 95 and 98 percent).
No industrial production process for producing anhydrous sodium sulfate (anhydrous sodium sulfate) by directly reacting sodium chloride with concentrated sulfuric acid is found through retrieval.
The invention is realized by the following steps:
a method for producing anhydrous sodium sulfate, characterized in that the method comprises the steps of: crushing industrial salt, sieving with 0.33mm sieve, mixing with concentrated sulfuric acid in the weight ratio of 1 to 0.7, high temperature chemical reaction to produce sodium sulfate and hydrogen chloride gas, cooling sodium sulfate and crushing.
The reaction mechanism of the invention is as follows:
by adopting the scheme, the method has the advantages of short process flow, high product quality, high product purity of 99-99.3%, low operation cost, convenience in operation, simple production process and safety in operation, and 1 ton of sodium sulfate can be produced to co-produce 1.55 ton of 31% hydrochloric acid.
The attached drawing is a production process flow block diagram of the invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in the attached drawing, the invention relates to a method for industrially producing anhydrous sodium sulfate by using sodium chloride and concentrated sulfuric acid, which comprises the following steps: firstly, crushing industrial salt (sodium chloride) with the water content of less than 3 percent and the purity of more than 95 percent, then completely passing through a 0.3mm sieve, taking sodium chloride and 98 percent concentrated sulfuric acid according to the weight ratio of 1: 0.7, simultaneously putting the sodium chloride and the 98 percent concentrated sulfuric acid into a reaction furnace, heating the reaction furnace to 500-600 ℃, and simultaneously stirring the materials in the reaction furnace to fully mix and react for about 4 hours; after reaction, solid sodium sulfate and hydrogen chloride gas can be generated, and the sodium sulfate can be packaged into a finished product after taking materials, cooling (to below 150 ℃) and crushing. The hydrogen chloride gas can be absorbed into hydrochloric acid by a water absorption method.
Claims (4)
1. A method for producing anhydrous sodium sulfate, characterized in that the method comprises the steps of: crushing industrial salt, sieving with 0.33mm sieve, mixing with concentrated sulfuric acid in the weight ratio of 1 to 0.7, high temperature chemical reaction to produce sodium sulfate and hydrogen chloride gas, cooling sodium sulfate and crushing.
2. The production method according to claim 1, characterized in that: the purity of the industrial salt is more than 95 percent, and the moisture content is less than 3 percent; the concentration of the concentrated sulfuric acid is 98%.
3. The production method according to claim 1 or 2, characterized in that: the temperature of the chemical reaction is 500-600 ℃, and the time is 4 hours.
4. The production method according to claim 3, characterized in that: the hydrogen chloride gas generated after the reaction can be absorbed as hydrochloric acid by water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00111197 CN1277153A (en) | 2000-06-30 | 2000-06-30 | Production process of anhydrous sodium sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00111197 CN1277153A (en) | 2000-06-30 | 2000-06-30 | Production process of anhydrous sodium sulfate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1277153A true CN1277153A (en) | 2000-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00111197 Pending CN1277153A (en) | 2000-06-30 | 2000-06-30 | Production process of anhydrous sodium sulfate |
Country Status (1)
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| CN (1) | CN1277153A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540545A (en) * | 2016-02-26 | 2016-05-04 | 浙江奇彩环境科技股份有限公司 | Recycling treatment method for waste sodium chloride and waste acid |
| CN106076504A (en) * | 2016-08-25 | 2016-11-09 | 广西联壮科技股份有限公司 | The reducing mechanism of sodium sulfide raw material pretreatment stage |
| CN109384198A (en) * | 2018-12-13 | 2019-02-26 | 中南大学 | A method of hydrochloric acid is produced with sodium chloride |
| CN111498872A (en) * | 2020-04-14 | 2020-08-07 | 赣州虔博新材料科技有限公司 | Lithium phosphate recycling process |
| CN113149038A (en) * | 2020-01-22 | 2021-07-23 | 浙江龙盛集团股份有限公司 | Resource utilization method for treating industrial mixed waste salt by using sulfuric acid |
-
2000
- 2000-06-30 CN CN 00111197 patent/CN1277153A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105540545A (en) * | 2016-02-26 | 2016-05-04 | 浙江奇彩环境科技股份有限公司 | Recycling treatment method for waste sodium chloride and waste acid |
| CN106076504A (en) * | 2016-08-25 | 2016-11-09 | 广西联壮科技股份有限公司 | The reducing mechanism of sodium sulfide raw material pretreatment stage |
| CN109384198A (en) * | 2018-12-13 | 2019-02-26 | 中南大学 | A method of hydrochloric acid is produced with sodium chloride |
| CN113149038A (en) * | 2020-01-22 | 2021-07-23 | 浙江龙盛集团股份有限公司 | Resource utilization method for treating industrial mixed waste salt by using sulfuric acid |
| CN111498872A (en) * | 2020-04-14 | 2020-08-07 | 赣州虔博新材料科技有限公司 | Lithium phosphate recycling process |
| CN111498872B (en) * | 2020-04-14 | 2022-12-13 | 赣州虔博新材料科技有限公司 | Lithium phosphate recycling process |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |