Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite

A technology of sodium hypophosphite and sodium hypochlorite solution, applied in the directions of hypophosphorous acid, phosphorus oxyacid, separation method, etc., can solve the problems of long process, high risk, environmental pollution, etc., and achieves improved absorption efficiency, good gas scrubbing effect, The effect of high absorption efficiency

Inactive Publication Date: 2010-02-24
KUNMING UNIV OF SCI & TECH
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the disadvantage of this method is that it produces tail gas containing phosphine, and the concentration of phosphine in the tail gas can reach more than 50%.
The disadvantage of this method is that the process is too long, the device occupies a large area, and most of them are manually operated, which is more dangerous; in addition, the phosphoric acid generated is only a cheap industrial product, and the economic benefit is not high, which undoubtedly increases the cost. In terms of environmental protection, this method will also produce a small amount of phosphine and phosphoric acid mist, which will also cause environmental pollution when discharged into the atmosphere.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite
  • Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite
  • Method for comprehensively utilizing tail gas of sludge phosphorus-prepared sodium hypophosphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get 21.03g of mud phosphorus from Kunyang Phosphate Fertilizer Factory with an average phosphorus content of 33.1%, containing about 6.98g of phosphorus. According to the water-to-phosphorus ratio of 105:1 and the alkali-to-phosphorus ratio of 3.5:1, the proportioning ratio of sodium hydroxide and calcium hydroxide is 5:1 into the reactor, the temperature is controlled at 85°C for reaction, and the flow rate of carrier gas nitrogen is 20mL / min.

[0031] The washing liquid is 80% concentrated phosphoric acid;

[0032] Fill the primary absorption tube with 100mL of 0.75% NaClO solution, pH=9;

[0033] Fill the secondary absorption tube with 100mL of 7% NaClO solution, pH=9;

[0034] Fill the tertiary absorption tube with 100mL of 7% NaClO solution, pH=13;

[0035] Put 80.01 g of modified activated carbon into the adsorption tube.

[0036] The results of the absorption test are as follows:

[0037] Table 1 Absorption test results

[0038] test results

re...

Embodiment 2

[0043] Get 19.68g of mud phosphorus from Kunyang Phosphorus Plant with an average phosphorus content of 45.1%, containing about 8.87g of phosphorus. The ratio is 5:1 into the reactor to react at a temperature of 80°C, and the nitrogen carrier gas flow rate is 25mL / min.

[0044] The washing liquid is 85% concentrated phosphoric acid;

[0045] Fill the primary absorption tube with 100mL of 0.75% NaClO solution, pH=9;

[0046] Fill the secondary absorption tube with 100mL of 7% NaClO solution, pH=9;

[0047] Fill the tertiary absorption tube with 100mL of 7% NaClO solution, pH=13;

[0048] 90.21 g of modified activated carbon was placed in the adsorption tube.

[0049] The results of the absorption test are as follows:

[0050] Table 3 Absorption test results

[0051] test results

reactor

1 # absorption tube

2 # absorption tube

3 # absorption tube

Sodium hypophosphite content / g

14.54

2.64

1.175

0.881

Phosph...

Embodiment 3

[0056] Take 22.84g of phosphorus from the Kunyang Phosphorus Plant with a phosphorus content of 35.6%, containing about 8.13g of phosphorus, according to the water-to-phosphorus ratio of 105:1, the alkali-to-phosphorus ratio of 3.5:1, the proportioning of sodium hydroxide and calcium hydroxide 5:1 into the reactor for reaction at a temperature of 90 ° C, nitrogen carrier gas flow rate of 40mL / min.

[0057] The washing liquid is 90% concentrated phosphoric acid;

[0058] Fill the primary absorption tube with 100mL of 0.75% NaClO solution, pH=9;

[0059] Fill the secondary absorption tube with 100mL of 7% NaClO solution, pH=9;

[0060] Fill the tertiary absorption tube with 100mL of 7% NaClO solution, pH=13;

[0061] 99.83 g of modified activated carbon was placed in the adsorption tube.

[0062] The results of the absorption test are as follows:

[0063] Table 5 Absorption test results

[0064] test results

reactor

1 # absorption tube

2 # absorpt...

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 relates to a method for comprehensively utilizing and processing tail gas of sludge phosphorus-prepared sodium hypophosphite, belonging to the technical field of chemical engineering andenvironmental protection. The process flow thereof is as follows: (1) after the phosphine tail gas of the sludge phosphorus-prepared sodium hypophosphite is collected, particle impurities in the tailgas are rinsed and eliminated by phosphoric acid solution under the condition that nitrogen is used as protective carrier gas; (2)the impurified tail gas is eliminated sequentially enters a three-grade absorption device adopting sodium hypochlorite solution as absorption solution so that the product of sodium hypophosphite can be obtained; and (3) the phosphine which still exists in the absorbedtail gas is adsorbed by modified activated carbon, and then is emitted outside after reaching the emission standard. The method of the invention is economical and practical, can recycle and convert the phosphine in the tail gas into the product of sodium hypophosphite with high added value, and greatly reduces environmental pollution caused by the tail gas.

Description

technical field [0001] The invention relates to a method for comprehensively utilizing and treating sludge phosphorus to produce sodium hypophosphite tail gas, belonging to the technical fields of chemical industry and environmental protection. Background technique [0002] my country is a large phosphorus-producing country. In the past 20 years, the development of the phosphorus chemical industry has occupied an important position in the overall layout of the international phosphorus chemical industry, and has made great contributions to the development and prosperity of the social economy. [0003] At present, most of the domestic yellow phosphorus production enterprises adopt the process technology of producing yellow phosphorus in the electric furnace method. This process is to place the mixture of phosphate rock, silica and coke in a closed three-phase electric furnace, and reduce it at a high temperature of 1400 ° C to 1500 ° C. The solid waste (commonly known as mud p...

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
IPC IPC(8): B01D53/74B01J20/32B01J20/20C01B25/165
Inventor 黄小凤胡若鹏宁平谭娟李凌宜刘伟文
Owner KUNMING UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com