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

A wet-process phosphoric acid, efficient evaporation technology, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large boiling point rise, difficulty in reusing heat sources, and low secondary steam saturation temperature, etc. The effect of steam consumption, improving economic efficiency of enterprises, saving construction materials and investment

Active Publication Date: 2011-04-13
SINOPEC NANJING ENG & CONSTR
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  • 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

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

[0050] 1 300,000 tons / year P 2 o 5 The phosphoric acid concentration unit consists of 3 production lines, each with a capacity of 100,000 tons per year. The process is shown in Flowchart 1. Each line includes the following main equipment:

[0051] (1) I effect heater shell and tube type F i =385m 2 Graphitized tube, carbon steel shell

[0052] (2) I-effect flash chamber D = 1.8m carbon steel lined with butyl rubber or F4, and the bottom is lined with carbon bricks

[0053] (3) I-effect circulating pump axial flow Q=5000m 3 / h H=4.6m pump casing impeller F33 or 2205

[0054] (4) II effect heater shell and tube type F i =200m 2 Graphitized tube, carbon steel lined butyl rubber shell

[0055] (5) II-effect flash chamber D = 3.8m carbon steel lined with butyl rubber, and the bottom lined with carbon bricks

[0056] (6) II effect circulation pump axial flow Q=2580m 3 / h H=4.6m pump casing impeller F33 or CD4MCu double-effect evaporation and single-effect evaporation main ...

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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 double-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 It is used after concentration, and the single-effect evaporation process of forced circulation vacuum concentration is widely used. Similarly, there are no reports abroad that adopt the multi-effect evaporation process. [0003] The biggest disadvantage of single-effect evaporation is poor heat utilization rate and high steam consumption. The heat of fresh steam is only used once, and the secondary steam generated is not used. It takes a lot of circulating cooling water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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
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