Production technology for synthesizing high-purity phosphorus pentasulfide by liquid-phase continuous process

Abstract

The invention relates to production technology for synthesizing high-purity phosphorus pentasulfide by liquid-phase continuous process, which belongs to the field of preparation of fine phosphorus chemical products in chemical industry. The production technology for synthesizing high-purity phosphorus pentasulfide by liquid-phase continuous process comprises the following steps: after melting and precipitating solid yellow phosphorus and solid sulphur, continuously conveying the melted and precipitated solid yellow phosphorus and solid sulphur into a reaction kettle with a pump in the ratio of 1 to 2.6, stirring under the condition of 400 DEG C and 0.15 MPa to perform liquid phase reaction, continuously pumping reacted raw materials into a distillation still, performing negative pressure distillation in the distillation still by using reaction heat, condensing formed phosphorus pentasulfide steam by reduced pressure distillation into liquid phosphorus pentasulfide by using a condenser, concentrating the liquid phosphorus pentasulfide into a phosphorus pentasulfide product storage tank, conveying the product into a pelleter with the pump, processing the product into sheet, crushing, grinding and finally packaging into finished products. The production technology for synthesizing high-purity phosphorus pentasulfide by liquid-phase continuous process has the advantages of simple operation, stability and safety, low energy consumption, high degree of automation and excellent product quality.

Description

technical field [0001] The invention relates to a production technology for synthesizing high-purity phosphorus pentasulfide by a liquid-phase continuous method, belonging to the field of preparation of fine phosphorus chemical products in the chemical industry. Background technique [0002] Phosphorus pentasulfide is an important chemical raw material intermediate, mainly used in pesticide intermediates, organophosphorus insecticides, multi-effect additives for lubricating oil, non-ferrous metal beneficiation flotation agents and pharmaceutical industries. In recent years, with the development of my country's petrochemical industry, the domestic demand for phosphorus pentasulfide is increasing year by year, and the demand for phosphorus pentasulfide in the international market is also showing an increasing trend, especially for high-grade lubricating oil additives. [0003] At present, the domestic production technology of phosphorus pentasulfide all adopts liquid-phase bat...

AI Technical Summary

Problems solved by technology

The ratio of raw materials in this method is not accurate, and there is no means of controlling the ratio of phosphorus to sulfur

The temperature of the reaction kettle fluctuates greatly. After the raw material sulfur and phosphorus enter the reaction kettle, they are allowed to react without any monitoring method. Simple distillation after the reaction is difficult to guarantee product quality

As a result, the quality requirements of various industries for phosphorus pentasulfide cannot be met, and all manufacturers cannot produce at full capacity, and the production lines are often idle. There is a partial gap in the domestic high-purity phosphorus pentasulfide market.

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