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
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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 temper

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

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...

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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 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

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Application Information

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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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