CN1160677A - Potassium sulfate producing process - Google Patents
Potassium sulfate producing process Download PDFInfo
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- CN1160677A CN1160677A CN 96117810 CN96117810A CN1160677A CN 1160677 A CN1160677 A CN 1160677A CN 96117810 CN96117810 CN 96117810 CN 96117810 A CN96117810 A CN 96117810A CN 1160677 A CN1160677 A CN 1160677A
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- sulfuric acid
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- potassium chloride
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- potassium sulfate
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Abstract
The present invention is new method of producing potassium sulfate with potassium chloride and sulfuric acid as material and features that assistant is added to the two kinds of material. The first step of reaction is performed at normal temp and pressure and the second at normal pressure and medium and low temp. The product includes potassium sulfate and hydrogen chloride, and the latter is cooled and water-absorbed to result in hydrochloric acid. The said process has low reaction temp, low power consumption, high product quality and short technological process, and it uses only universal chemical equipment.
Description
The present invention relates to a new method for producing potassium sulfate by using potassium chloride and sulfuric acid as raw material.
The conventional methods for producing potassium sulfate from potassium chloride and sulfuric acid include the Mannheim method (Mamhim) conversion method, the banburying method, and the like. In the industrial production process, the methods have the defects of high reaction temperature, large energy consumption and large reaction furnace, or the added transforming agent and associative agent have high price and large dosage, and even remain in finished products to cause poor product quality. Further, the production cost is high, the investment is large, and the product quality is unstable, so that good economic benefits cannot be realized in industrial production.
The invention aims to provide a new method for producing potassium sulfate, which has low reaction temperature and low energy consumption, adopts common chemical equipment to carry out reaction, and realizes good comprehensive economic benefits of low investment, low cost and high product quality.
The invention comprises the following contents: potassium chloride and sulfuric acid are used as raw materials, and the method is characterized in that an auxiliary agent is added into the potassium chloride and the sulfuric acid, and the first-step reaction is carried out at normal temperature and normal pressure; the second step reaction is carried out at normal pressure and low temperature. The amount of potassium chloride and sulfuric acid is not less than that of the reactionTheoretical dosage calculated by the formula; the used auxiliary agent adopts rare earth catalyst ASW; the first step of reaction is carried out in an anticorrosive reaction kettle, and the second step of reaction is carried out in a drying furnace at the temperature of 300-350 ℃. The sulfuric acid is industrial sulfuric acid with a concentration of more than 93 percent, the preferable concentration is 98 percent, the potassium chloride content is more than 90 percent, the preferable content is 95 percent, the preferable weight ratio of the potassium chloride to the sulfuric acid is (0.88-0.90) to (0.58-0.60), and the rare earth catalyst ASW is used in a small amount. The baking furnace adopts an isolated mode, and hydrogen chloride generated by the two-step reaction is directly cooled and then absorbed by water to be hydrochloric acid. The two-step reaction formula is as follows:
general reaction formula
Drawings
FIG. 1 is a schematic view of the process of the present invention
Example (b): see FIG. 11. Adding industrial sulfuric acid (H) with the concentration of 98% and the content of 95% potassium chloride (KCL)2SO4) The raw materials are put into a common ceramic reaction kettle according to the weight ratio of 0.9: 0.6, and a small amount of diluted coal-contacting agent ASW is added at the same time, the reaction is carried out at normal temperature and normal pressure, and the mixture is stirred for about 1 hour to complete the first step reaction. 2. And (3) conveying the intermediate solid powdery product generated by the reaction in the first step into an isolated oven, wherein the oven is built by common refractory bricks, and the reaction temperature is controlled at 320 ℃. The second reaction was completed in about 1 hour. 3. The hydrogen chloride vapor generated by the two-step reaction enters the same set of absorption device after being cooled and is absorbed by water to prepare hydrochloric acid. Cooling and crushing the potassium sulfate in the drying furnace after the potassium sulfate is taken out of the drying furnace to obtain the finished product potassium sulfate K2SO4。
The invention has the advantages that: 1. the reaction temperature is low, the energy consumption is low, and the reaction process can be finished by adopting common chemical equipment. 2. Low investment and low cost. 3. High quality potassium sulfateand high quality. 4. Stable and reliable material source, less by-products and no pollution. 5. Low investment, high return, high comprehensive economic benefit and large potential for scale development.
Claims (4)
1. A process for preparing potassium sulfate from potassium chloride and sulfuric acid features that the assistant is added to potassium chloride and sulfuric acid, the first step is carried out at ordinary temp. and pressure, and the second step is carried out at ordinary temp. and pressure.
2. The process of claim 1, wherein the amounts of potassium chloride and sulfuric acid are not less than the theoretical amounts calculated from the reaction formula; the used auxiliary agent adopts rare earth catalyst ASW; the first step of reaction is carried out in an anticorrosive reaction kettle; the second step reaction is carried out in an oven at the temperature of 300-350 ℃.
3. The process as claimed in claim 1 or 2, characterized in that the sulfuric acid is technical sulfuric acid with a concentration of more than 93%, preferably 98%, potassium chloride with a content of more than 90%, preferably 95%, the preferred weight ratio of potassium chloride to sulfuric acid is (0.88-0.9): (0.58-0.60), and the rare earth catalyst ASW is used in small amounts.
4. A process as claimed in claims 1 and 2, wherein the oven is of the isolated type, and the hydrogen chloride produced in both steps is directly cooled and absorbed by water to form hydrochloric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96117810 CN1160677A (en) | 1996-12-04 | 1996-12-04 | Potassium sulfate producing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96117810 CN1160677A (en) | 1996-12-04 | 1996-12-04 | Potassium sulfate producing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1160677A true CN1160677A (en) | 1997-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96117810 Pending CN1160677A (en) | 1996-12-04 | 1996-12-04 | Potassium sulfate producing process |
Country Status (1)
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| CN (1) | CN1160677A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113603117A (en) * | 2021-09-14 | 2021-11-05 | 齐齐哈尔市茂尔农业有限公司 | Potassium sulfate co-production compound fertilizer production device and key structure and process flow thereof |
-
1996
- 1996-12-04 CN CN 96117810 patent/CN1160677A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113603117A (en) * | 2021-09-14 | 2021-11-05 | 齐齐哈尔市茂尔农业有限公司 | Potassium sulfate co-production compound fertilizer production device and key structure and process flow thereof |
| CN113603117B (en) * | 2021-09-14 | 2023-09-22 | 齐齐哈尔市茂尔农业有限公司 | Potassium sulfate co-production compound fertilizer production device and key structure and process flow thereof |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
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