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Process for producing high-quality phosphorus pentasulfide

A technology of phosphorus pentasulfide and condensation equipment, which is applied in the direction of phosphorus compounds of phosphorus sulfur/selenium/tellurium, etc., can solve the problems of poor quality of production products, backward production technology, lack of production technology of high-quality products, etc., so as to save energy and reduce production costs. Effect

Inactive Publication Date: 2011-03-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, except for a few enterprises producing phosphorus pentasulfide in my country, most of the products produced are of poor quality due to backward production technology and other reasons, and can only be used in pesticides, mineral processing and other industries, lacking production technology for high-quality products

Method used

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  • Process for producing high-quality phosphorus pentasulfide
  • Process for producing high-quality phosphorus pentasulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: After the primary phosphorus pentasulfide is added to the distillation kettle through the feed buffer tank, vacuumize to 0.07MPa, and the material is boiled by electric heating, and then the heating is reduced by 10% to evaporate, and the evaporated gaseous phosphorus pentasulfide enters the condensation After the tube gradually condenses into a liquid state, it enters the collection tank for storage. After the phosphorus pentasulfide in the collection tank reaches a certain amount, it is put into the discharge buffer tank, and then compressed by a tablet machine to obtain high-quality phosphorus pentasulfide products. The product is analyzed by the analysis method in the GB13258-91 standard. The product contains P27.63%, S71.80%, the appearance is yellow, and the final melting point is 277 ° C. It reaches the superior grade of GB13258-91 industrial phosphorus pentasulfide.

Embodiment 2

[0017] Example 2: After the primary phosphorus pentasulfide is added to the distillation kettle through the feed buffer tank, vacuumize to 0.08MPa, and the material is boiled by electric heating, and then the heating is reduced by 10% to evaporate, and the evaporated gaseous phosphorus pentasulfide enters the condensation After the tube gradually condenses into a liquid state, it enters the collection tank for storage. After the phosphorus pentasulfide in the collection tank reaches a certain amount, it is put into the discharge buffer tank, and then compressed by a tablet machine to obtain high-quality phosphorus pentasulfide products. The product is analyzed by the analysis method in the GB13258-91 standard. The product contains P27.68%, S71.77%, the appearance is yellow, and the final melting point is 277°C.

Embodiment 3

[0018] Example 3: After the primary phosphorus pentasulfide is added to the distillation kettle through the feed buffer tank, vacuumize to 0.075MPa, and the material is boiled by electric heating, and then the heating is reduced by 20% to evaporate, and the evaporated gaseous phosphorus pentasulfide enters the condensation After the tube gradually condenses into a liquid state, it enters the collection tank for storage. After the phosphorus pentasulfide in the collection tank reaches a certain amount, it is put into the discharge buffer tank, and then compressed by a tablet machine to obtain high-quality phosphorus pentasulfide products. The product is analyzed by the analysis method in the GB13258-91 standard. The product contains P27.71%, S71.80%, the appearance is yellow, and the final melting point is 277 ° C. It reaches the superior grade of GB13258-91 industrial phosphorus pentasulfide.

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Abstract

The invention relates to a method for preparing high-quality phosphorus pentasulfide and belongs to the field of the preparation of fine phosphorus chemical products in chemical engineering industry. The method comprises the following steps: industrial phosphorus pentasulfide is added into a vacuum distillation kettle through a feeding buffer tank and is heated in vacuum; the volatilized gaseous phosphorus pentasulfide is conducted to condensation equipment and is condensed to form liquid phosphorus pentasulfide; the liquid phosphorus pentasulfide flows into a collection tank, enters a preforming machine through a discharging buffer tank and is preformed to obtain a high-quality phosphorus pentasulfide product; and the raw materials in the feeding buffer tank and the discharging buffer tank are protected by charging nitrogen gas. The method has a simple process flow and easy, stable and safe operation, and can produce the high-quality phosphorus pentasulfide product with low cost.

Description

technical field [0001] The invention relates to a preparation method of high-quality phosphorus pentasulfide, which belongs to the field of preparation of fine phosphorus chemical products in the chemical industry. Background technique [0002] Phosphorus pentasulfide is a light yellow or yellow-green crystalline substance with an odor similar to hydrogen sulfide and strong hygroscopicity. It is an important chemical raw material intermediate. It is mainly used in the production of insecticides, high-efficiency organophosphorus pesticides, and advanced lubricating oil additives. It is used in organic synthesis to prepare various compounds containing sulfur or phosphorus, and in the pharmaceutical industry to produce drugs such as arabinosin and Yajining. In recent years, with the understanding of the toxicity of pesticide residues, the amount of organophosphorus pesticides has been decreasing year by year due to their inherent characteristics, and the market share has gradu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/14
Inventor 苏毅夏举佩李国斌
Owner KUNMING UNIV OF SCI & TECH