Method for joint production of potassium sulphate and calcium chloride dihydrate

A technology of calcium chloride dihydrate and joint production, which is applied in the preparation of calcium/strontium/barium chloride, sulfate/bisulfate, calcium/strontium/barium halide, etc., can solve repeated energy consumption and energy waste , large water evaporation, high energy consumption in the concentration process, to achieve the effect of saving energy consumption and investment in process equipment, solving environmental problems, and saving energy demand

Active Publication Date: 2016-02-17
LONGYAN ZIYUN CHEM TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

The patent application number CN201410833456.6 discloses a typical method for producing calcium chloride dihydrate, but because the concentration of the distillation waste liquid used is generally low, the evaporation of water in the concentration operation will be relatively large. At the same time, It is also impossible to directly extract the desired product during the concentration process, which leads to a series of subsequent redundant processes, such as washing and drying the crystals after concentration and crystallization.
[0014] The process of using acid and limestone to produce calcium chloride is more complicated than the process mentioned above, because in addition to the process mentioned above, it also involves the treatment of other reactants and products
For example, when hydrochloric acid reacts with limestone, in addition to the treatment of unreacted limestone slag, it also involves the treatment of unreacted hydrogen chloride in the process of concentration. Therefore, this method not only has higher technical requirements, but also has caused environmental safety. a degree of threat
[0015] Combining the production methods of calcium chloride mentioned above, it can be clearly found that there are major defects in it, such as high energy consumption in the concentration process, long process flow and the phenomenon of repeated energy consumption and energy being directly discarded and wasted

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  • Method for joint production of potassium sulphate and calcium chloride dihydrate

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Experimental program
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Effect test

Embodiment 1

[0051] (1) 10mol Potassium Chloride and 5mol concentrated sulfuric acid (98wt%) are added to react in the first reactor, pass into superheated steam by the steam inlet 1 of the first reactor, the temperature control of superheated steam is 180 ℃, pressure control It is 0.13Mpa, after the steam is fully contacted with the reactant in the first reactor, the water vapor containing hydrogen chloride generated by the reaction is discharged from the steam outlet 2 of the first reactor;

[0052] (2) Add 5.1mol calcium oxide in the second reactor, the steam containing hydrogen chloride discharged by the steam outlet 2 of the first reactor enters in the second reactor through the steam inlet 3 of the second reactor, and wait to contain hydrogen chloride After the water vapor in the second reactor is fully contacted with the calcium oxide in the second reactor, calcium chloride dihydrate and superheated steam are obtained, and the superheated steam is discharged from the steam outlet 4 o...

Embodiment 2

[0054] (1) 20mol Potassium Chloride and 11mol concentrated sulfuric acid (98wt%) are joined in the first reactor to react, pass into superheated steam by steam inlet 1 of the first reactor, superheated steam temperature is controlled as 220 ℃, and pressure is controlled as 0.6Mpa. After the steam is in full contact with the reactant in the first reactor, the water vapor containing hydrogen chloride generated by the reaction is discharged from the steam outlet 2 of the first reactor;

[0055] (2) The calcium oxide that adds 11.7mol is in the second reactor, and the water vapor that contains hydrogen chloride discharged by the steam outlet 2 of the first reactor enters in the second reactor by the steam inlet 3 of the second reactor, and waits to contain After the water vapor of hydrogen chloride is fully contacted with the calcium oxide in the second reactor, calcium chloride dihydrate and superheated steam are obtained, and the superheated steam is discharged from the steam ou...

Embodiment 3

[0057] (1) 30mol Potassium Chloride and 13.6mol concentrated sulfuric acid (98wt%) are added to react in the first reactor, pass into superheated steam by steam inlet 1 of the first reactor, the temperature control of superheated steam is 270 ℃, pressure The control is 1.2Mpa. After the steam is in full contact with the reactant in the first reactor, the water vapor containing hydrogen chloride generated by the reaction is discharged from the steam outlet 2 of the first reactor;

[0058] (2) Add 18mol of calcium oxide in the second reactor, the steam containing hydrogen chloride discharged by the steam outlet 2 of the first reactor enters in the second reactor through the steam inlet 3 of the second reactor, and wait to contain hydrogen chloride After the water vapor in the second reactor is fully contacted with the calcium oxide in the second reactor, calcium chloride dihydrate and superheated steam are obtained, and the superheated steam generated by the reaction is discharg...

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Abstract

The invention relates to a method for joint production of potassium sulphate and calcium chloride dihydrate. The method comprises the steps of 1, adding potassium chloride and sulfuric acid to a first reactor, and introducing superheated steam to the first reactor to generate potassium sulphate and vapor containing hydrogen chloride through reaction; 2, introducing the vapor containing hydrogen chloride to a second reactor to generate calcium chloride dihydrate and superheated steam through reaction with calcium oxide or calcium hydroxide, and circulating the superheated steam to the step 1. By the adoption of the method, high energy consumption during production of potassium sulphate and calcium chloride dihydrate is avoided, the byproduct hydrogen chloride is well utilized, and environment pollution is basically avoided.

Description

technical field [0001] The invention relates to a preparation method of potassium salt, in particular to a method for jointly producing potassium sulfate and calcium chloride dihydrate. Background technique [0002] Potassium sulfate is an important inorganic chemical raw material, which is mainly used in the agricultural field to provide fertilizers with potassium and sulfur elements necessary for crop growth. In addition, potassium sulfate can also be used as dye intermediates, spice additives and medical Laxatives etc. [0003] There are three main methods for the production of potassium sulfate. One is the conversion method of producing potassium sulfate by reacting sulfuric acid or sulfate with potassium chloride. The total amount of potassium sulfate produced by this method accounts for about 75% of the world's total production of potassium sulfate. This method is represented by the Mannheim method, which was born in Germany at the end of the 19th century. It is the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/02C01F11/28
CPCC01D5/02C01F11/28C01P2006/80
Inventor 钟劲光吴明钟颖苑
Owner LONGYAN ZIYUN CHEM TECH
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