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

Novel technology of two-effect evaporation of phosphoric acid with wet method

A technology of wet-process phosphoric acid and efficient evaporation, which is applied in the fields of phosphorus compounds, chemical instruments and methods, and inorganic chemistry. Effect of steam consumption, improvement of enterprise economic benefits, saving of construction materials and investment

Active Publication Date: 2009-06-03
SINOPEC NANJING ENG & CONSTR
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Phosphoric acid has a large boiling point elevation value, which means that it needs to be heated to the boiling point at a much higher temperature than heating water, but the saturation temperature of the secondary steam produced is not high, and it is difficult to reuse it as a heat source

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
  • Novel technology of two-effect evaporation of phosphoric acid with wet method
  • Novel technology of two-effect evaporation of phosphoric acid with wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1 block of 300,000 tons / year P 2 O 5 The phosphoric acid concentration unit consists of 3 production lines, each with a capacity of 100,000 tons / year. The process is shown in flow chart 1. Each line includes the following main equipment:

[0054] (1) I-effect heater shell and tube type F i =385m 2 Graphitized tube, carbon steel housing

[0055] (2) I-effect flash chamber D=1.8m carbon steel lined with butyl rubber or F4, bottom lined with carbon bricks

[0056] (3) I-effect circulating pump axial flow Q=5000m 3 / h H=4.6m pump casing impeller F33 or 2205

[0057] (4) II effect heater shell and tube type F i =200m 2 Graphitized tube, carbon steel lined with butyl rubber casing

[0058] (5) II-effect flash chamber D=3.8m carbon steel lined with butyl rubber, bottom lined with carbon bricks

[0059] (6) II-effect circulating pump axial flow Q=2580m 3 / h H=4.6m pump casing impeller F33 or CD4MCu

[0060] Comparison of main equipment between double-effect evaporati...

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 belongs to the field of phosphoric acid production, and relates to a novel technology of two-effect evaporation of phosphoric acid with wet method. The novel technology comprises the following steps: adding dilute phosphoric acid to a circulation loop; heating with vapor; conducting flash evaporation at a specific temperature and under a specific pressure; and removing water to concentrate a phosphoric acid. A concentration device comprises two loops connected in series, and is counter-flow operated; and the concentration of the phosphoric acid raises from effect I to effect II, however, the temperature of the vapor falls from effect I to effect II, that is, fresh air is used for heating effect I phosphoric acid to generate secondary steam and then heating effect II phosphoric acid. The invention can save vapor consumption, save construction material and investment and improve economic benefit of enterprises.

Description

technical field [0001] The invention belongs to the field of phosphoric acid production, and relates to a wet-process phosphoric acid two-effect evaporation process. Background technique [0002] Wet-process phosphoric acid is the basic intermediate product of phosphorus compound fertilizer and phosphate industry. It has a very important position and is in great demand. At present, my country has formed about 9 million tons / year P 2 O 5 production capacity, of which about 5.58 million tons of P 2 O 5 After concentration, the forced circulation vacuum concentration single-effect evaporation process is widely used. Also in foreign countries, there is no report on the use of multi-effect evaporation process. [0003] The biggest disadvantage of single-effect evaporation is that the heat utilization rate is poor, the steam consumption is high, the heat of the fresh steam is only used once, and the secondary steam generated is not used. Single-effect evaporation consumes ab...

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): C01B25/234
Inventor 孙国超陈德兴陈玉如李明军胡珊珊
Owner SINOPEC NANJING ENG & CONSTR
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