Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing phosphine and sodium trimetaphosphate simultaneously

A technology of sodium trimetaphosphate and phosphine, applied in chemical instruments and methods, phosphine, phosphorus compounds, etc., can solve the problems of low phosphine yield, consumption of large element phosphorus, and inability to completely decompose, etc. Achieve the effect of preventing oxidation and high temperature decomposition and dissolution, increasing the content, and reducing the production of long-chain high-molecular-weight chemicals

Active Publication Date: 2015-10-28
福建智膦化学有限公司
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these additives is that they cannot be completely decomposed when the ideal reaction temperature is reached, and the purity of the finished product is correspondingly reduced.
The yield of phosphine in traditional industrial production is not high, it needs to consume a large amount of elemental phosphorus, and the purity is also low, which often requires further purification, and it is easy to cause environmental pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 (A-10V-031 / A-10V-032-1)

[0023] A mixture of sodium phosphite and sodium phosphate prepared from 25 g of phosphorous acid, 26 g of phosphoric acid (85.7%) and 21 g of sodium hydroxide (96%) was evaporated to dryness under reduced pressure at 70°C to constant weight to obtain a theoretical amount of anhydrous mixed salt 55.8 g, P of the mixed salt Ⅲ / P VThe calculated value is 1.34, the sodium-phosphorus ratio is determined to be 0.923 (calculated value is 0.947), and the pH value of the solution (1%) is 3.34. Place 30 g of this mixed salt in a three-necked flask equipped with a nitrogen inlet and outlet, and replace the flask with nitrogen Neutral air, after half an hour, keep the nitrogen flow, the pressure is slightly higher than the standard atmospheric pressure, then the mixture is heated to 350 ° C, the material is melted and bubbled at this temperature, and the released phosphine is carried by nitrogen into the solution containing mercuric chloride ( ...

Embodiment 2

[0024] Example 2 (A-10V-013 / A-10V-014-1)

[0025] Sodium phosphite and sodium phosphate salt mixture (P Ⅲ / P V =1.001) evaporated to dryness under reduced pressure at 70°C to constant weight to obtain 54.3 grams of theoretical anhydrous mixed salt. The pH value is 3.48. Put 10 g of the mixed salt in a three-necked flask equipped with a nitrogen inlet and outlet, and replace the air in the flask with nitrogen. After half an hour, keep the nitrogen flow, and the pressure is slightly higher than the standard atmospheric pressure, and then the mixture is heated to 300 ° C. , the material melts and bubbles at this temperature, and the released phosphine is brought into the absorption bottle filled with mercuric chloride solution (2-3%) by nitrogen gas, and the released phosphine is obtained by the weight of the precipitate in the absorption solution after drying and the loss of mercury ions in the solution is determined. After the bubbling ends, continue heating at the same temp...

Embodiment 3

[0026] Example 3 (A-11V-064 / A-11-065-1)

[0027] Sodium phosphite and phosphate mixture (P Ⅲ / P V =1.33) evaporated to dryness under reduced pressure at 70°C to constant weight to obtain 104.3 grams of theoretical anhydrous mixed salt. ) has a pH value of 2.76. Place 20 g of the mixed salt in a three-necked flask equipped with a nitrogen inlet and outlet, and replace the air in the flask with nitrogen. After half an hour, keep the nitrogen flow, and the pressure is slightly greater than the standard atmospheric pressure. Then the mixture is heated to 350°C, the material melts and bubbles at this temperature, the released phosphine is brought into the absorption bottle filled with mercury chloride solution (2-3%) by nitrogen, and the released phosphine is dried by the precipitate in the absorption liquid The final weight and the loss of mercury ions in the solution were determined. After the bubbling ended, continue heating at the same temperature for 2 hours, stop heating a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for simultaneously preparing hydrogen phosphide and sodium trimetaphosphate. A mixture of trivalent sodium phosphate and pentavalent phosphorus sodium salt, of which the sodium-phosphate ratio is 0.80-0.99, and the ratio {PIII / PV} of trivalent phosphorus atom to pentavalent phosphorus atom is 1 to (1-2) is subjected to disproportionation and condensation reaction after being heated to 200-400 DEG C under protection of nitrogen, so as to obtain pure hydrogen phosphide and sodium trimetaphosphate. By adopting the preparation method provided by the invention, decomposition and oxidization are avoided; pure hydrogen phosphide is obtained; the environmental pollution is prevented; meanwhile, the condensation reaction of the sodium trimetaphosphate is facilitated by using existence of the hydrogen phosphide, so as to obtain the sodium trimetaphosphate with higher purity; and a lot of long-chain high molecular weight materials are avoided. By adopting the shortened technological process of the sodium trimetaphosphate, the environmental pollution is reduced; the working hours are saved; the production energy consumption is reduced; and the production cost is saved, so that the entire production flow and the final product accord with the requirements of the food industry; and the effect of comprehensive development is achieved.

Description

technical field [0001] The invention relates to a method for preparing phosphide, in particular to a method for preparing phosphine (PH 3 ) and sodium trimetaphosphate ((NaPO 3 ) 3 )Methods. Background technique [0002] Sodium trimetaphosphate and phosphine are important materials in the chemical industry. Sodium trimetaphosphate is widely used in industry, especially in the process of starch esterification. High-purity sodium trimetaphosphate is required in the field of fine chemicals, and its water-insoluble content is required to be less than 0.5%, and it does not contain or contain a small amount of phosphate. The traditional preparation of sodium trimetaphosphate is to heat sodium orthophosphate through an intermediate product, mainly disodium dihydrogen pyrophosphate (acid pyrophosphate) (500°C), to generate a reactant containing trimetaphosphate. The reactants are often mixed with water-insoluble polyphosphate (Maddrell's salt). When the raw material is heated ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/06C01B25/445
Inventor 奥古斯都·威廉·迪特马尔·佐贝尔诺伯特·韦福林江卓贤
Owner 福建智膦化学有限公司