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Chemical process to produce hydrogen chloride and chloride-free compound potassium sulfate fertilizers or other metal sulfates

A technology of metal sulfate and sulfate, applied in ammonium sulfate, chemical instruments and methods, sulfate preparations, etc., can solve problems such as low energy efficiency and inability to produce double salts

Inactive Publication Date: 2010-08-18
F P C ENTERPRISE 2008
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, it is only suitable for use with KCl and cannot use any other metal chloride as starting material (to produce the corresponding sulfate)
The method also involves heating of the reactants since the reaction mixture does not provide enough heat to sustain the reaction and thus suffers from the same energy inefficiency as the above method
Moreover, the method does not directly produce K 2 SO 4 (the product can only be obtained after the aforementioned additional heating), and cannot produce double salts

Method used

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  • Chemical process to produce hydrogen chloride and chloride-free compound potassium sulfate fertilizers or other metal sulfates
  • Chemical process to produce hydrogen chloride and chloride-free compound potassium sulfate fertilizers or other metal sulfates
  • Chemical process to produce hydrogen chloride and chloride-free compound potassium sulfate fertilizers or other metal sulfates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] By adding 200g of K 2 SO 4 , 200g of H 2 SO 4 and 600g H 2 O was mixed for 3 hours to prepare an aqueous liquid, typically the supernatant remaining after sulfate precipitation. 548 g of KCl were then dissolved in this aqueous liquid ("supernatant"). 673 g of fuming sulfuric acid (31% free SO 3 ) into the container containing this solution. The HCl discharged from the reaction mixture was dissolved in 520 g of water; the total weight of the aqueous HCl solution thus obtained was 786 g. This HCl solution was found to contain 32% HCl and 0.5% H 2 SO 4 . Then, the sulfate-containing solution obtained from the reaction mixture was cooled to 35° C., whereby the sulfate-containing salt was precipitated. Crystals were separated from the supernatant by filtration, then dried at -105°C for 2 hours. The weight of the dried crystals was 340 g (44.7% yield). The resulting salt contained 34.2% K, compared to pure K 3 H(SO 4 ) 2 The theoretical value is 37.8%, the salt...

Embodiment 2

[0115] Using 40g of H 2 O 100 g of the dried sulphate product from the previous example were further washed to remove any residual H 2 SO 4 . The solid was filtered under vacuum then dried at -105°C for 2 hours. The wash does remove excess H 2 SO 4 ; The obtained product contains 36.2% of K and 16.7% of H 2 SO 4 .

Embodiment 3

[0117] In this experiment, the potassium sulfate double salt was neutralized with ammonia according to the following reaction:

[0118] K 3 H(SO 4 ) 2 +NH4OH→K 3 (NH 4 )(SO 4 ) 2 +H 2 o

[0119] 15 g of the washed and dried double salt from Example 2 were mixed with 10 g of 25% NH 4 OH was mixed for 1 hour. The precipitate was dried at ~105°C for 2 hours. The weight of the dried crystals was 15.64 g, which contained 4.42% N and 34.2% K (compared to theoretical values ​​of 4.3% N and 35.8% K).

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Abstract

A method is disclosed for production of a sulfate-containing salt and anhydrous gaseous HCl from a metal chloride (MClx) and oleum. MClx and oleum are mixed together with a water-containing liquid, forming gaseous HCl and a solution of a sulfate-containing salt or double salt. The salt is precipitated from the solution, and in a preferred embodiment, the supernatant liquid from the precipitation is recycled to the reaction mixture as the water-containing liquid in subsequent reaction cycles. In a preferred embodiment, HCl discharged from the reaction mixture is scrubbed to remove dust, water vapor and traces of H2SO4, yielding anhydrous HCl of >90% purity. The exothermicity of the reaction between the water-containing liquid and the oleum is sufficient that, unlike methods known in the prior art, the process proceeds quickly and efficiently without any necessity for additional heating of the reaction mixture. This method provides high-purity, low-chlorine sulfates, including the novel potassium sulfate double salts K3(NH4)(SO4)2, 3K2SO4*MgSO4 and 3K2SO4*CanMg2-nSO4.

Description

technical field [0001] This invention relates to processes for the production of hydrogen chloride and metal sulfates from metal chlorides and, in particular, to an improved process for the production of metal sulfates and hydrogen chloride from the reaction of metal salts with oleum. Background technique [0002] The most common industrial method for the production of hydrogen chloride and sodium sulfate or potassium sulfate uses the reaction of sodium chloride or potassium chloride with sulfuric acid at high temperature (generally 500-840°C) and is called the Mannheim process (schematically shown in Figure 1 sexual display). Because the reaction takes place at high temperatures, the Mannheim process is energy inefficient, using about half a barrel of oil per ton of sulfate. Furthermore, sulfates produced by the Mannheim process typically contain a few percent chloride impurity while HCl is evolved as a low concentration (-10%) mixture with combustion gases. In other proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/96C01B7/03C01C1/24C01D5/02C01D5/12C01F11/46
CPCC01B7/035C01D5/02C01F5/40C01C1/24C01D5/12C01B17/96
Inventor 伦尼德·芬克斯坦
Owner F P C ENTERPRISE 2008
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