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Production method for producing chemical reagent potassium sulphide

A technology of chemical reagents and production methods, applied in the direction of alkali metal sulfides/polysulfides, etc., can solve the problems of inability to meet market demand, low purity of potassium sulfide, troublesome operation, etc., to save packaging and transportation costs, high purity, Profitable effect

Inactive Publication Date: 2016-08-17
卢喆化工科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of raw materials and technology, the existing production process basically has problems such as troublesome operation, high energy consumption, serious pollution, etc., and the purity of the obtained product potassium sulfide is low, and the content is generally about 40%.
In recent years, with the development of some high-tech fields, the requirements for the refinement of potassium sulfide products are getting higher and higher, and the existing products are far from meeting the market demand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the embodiment of the present invention, a kind of production method of chemical reagent potassium sulfide comprises the following steps:

[0029] (1) According to the mass ratio of elemental sulfur:potassium carbonate is 21:100, the elemental sulfur and potassium carbonate are fully mixed and placed in a high temperature reactor;

[0030] (2) Heat the high-temperature reactor to 950°C at a heating rate of 3°C / min, and keep it warm for 80 minutes to obtain a mixture of anhydrous potassium sulfide and potassium sulfate;

[0031] (3) When the reaction in step (2) is over, feed nitrogen into the high-temperature reactor to form a protective atmosphere, and then add preheated to High-purity carbon black at 580°C, then raise the temperature of the high-temperature reactor to 920°C at a heating rate of 1°C / min, and keep the temperature for 50 minutes;

[0032] (4) After the reaction in step (3) is completed, the material is discharged under the protection of a nitrogen at...

Embodiment 2

[0034] In the embodiment of the present invention, a kind of production method of chemical reagent potassium sulfide comprises the following steps:

[0035] (1) According to the mass ratio of elemental sulfur:potassium carbonate is 24:100, the elemental sulfur and potassium carbonate are fully mixed and placed in a high temperature reactor;

[0036] (2) Heat the high-temperature reactor to 895°C at a heating rate of 8°C / min, and keep it warm for 100 minutes to obtain a mixture of anhydrous potassium sulfide and potassium sulfate;

[0037] (3) When the reaction in step (2) is over, feed nitrogen into the high-temperature reactor to form a protective atmosphere, and then add high-purity carbon black: potassium carbonate mass ratio of 4.5:100, add High-purity carbon black at 650°C, then raise the temperature of the high-temperature reactor to 860°C at a heating rate of 2°C / min, and keep the temperature for 60 minutes;

[0038] (4) After the reaction in step (3) is completed, the...

Embodiment 3

[0040] In the embodiment of the present invention, a kind of production method of chemical reagent potassium sulfide comprises the following steps:

[0041] (1) According to the mass ratio of elemental sulfur:potassium carbonate is 23.2:100, the elemental sulfur and potassium carbonate are fully mixed and placed in a high temperature reactor;

[0042] (2) Heat the high-temperature reactor to 910°C at a heating rate of 5°C / min, and keep it warm for 88 minutes to obtain a mixture of anhydrous potassium sulfide and potassium sulfate;

[0043] (3) When the reaction in step (2) is over, feed nitrogen into the high-temperature reactor to form a protective atmosphere, and then add preheated to High-purity carbon black at 620°C, then raise the temperature of the high-temperature reactor to 890°C at a heating rate of 1.5°C / min, and keep the temperature for 55 minutes;

[0044] (4) After the reaction in step (3) is completed, the material is discharged under the protection of a nitroge...

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PUM

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Abstract

The invention discloses a production method of the chemical reagent potassium sulfide, comprising: fully mixing elemental sulfur and potassium carbonate in proportion, placing them in a high-temperature reactor; heating the high-temperature reactor to 895-950°C, and obtaining no A mixture of potassium sulfide and potassium sulfate; then nitrogen is introduced into the high-temperature reactor to form a protective atmosphere, and then preheated high-purity carbon black is added to the high-temperature reactor in proportion, the temperature is raised to 860-920°C, and the temperature is kept for reaction; After the reaction is completed, the material is discharged under the protection of a nitrogen atmosphere to obtain. The present invention adopts a two-step reaction. First, potassium carbonate and elemental sulfur are used as raw materials. Under heating conditions, the mixture of anhydrous potassium sulfide and potassium sulfate is generated by the self-redox reaction of elemental sulfur, and then high-purity carbon black is used as a reduction agent. Reducing potassium sulfate under high-temperature inert reaction atmosphere conditions to obtain potassium sulfide with high purity (≥99%) and extremely low water-insoluble content (<0.14%).

Description

technical field [0001] The invention relates to the technical field of chemical reagent processing, in particular to a production method of the chemical reagent potassium sulfide. Background technique [0002] Potassium sulfide is a light yellowish-brown cubic crystal at room temperature, which is an inorganic compound, with a relative density of 1.805 (14°C) and a melting point of 840°C. It is unstable in the air and prone to deliquescence. It may explode when impacted or heated. Can gradually oxidize and deteriorate. Soluble in water, ethanol and glycerin, insoluble in ether, the aqueous solution is strongly alkaline. In case of acid, hydrogen sulfide is released. It is used as an analytical reagent in industries such as dyestuffs, papermaking, and tanning. [0003] At present, the production of potassium sulfide in China mainly has the following methods: one, pass excess hydrogen sulfide to saturation in the potassium hydroxide solution, and then add an equal amount of...

Claims

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Application Information

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IPC IPC(8): C01B17/22
CPCC01B17/22C01P2006/80
Inventor 曹志远
Owner 卢喆化工科技(上海)有限公司