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Process for concentrating phosphoric acid or other inorganic acids prepared by wet process

A technology of wet-process phosphoric acid and dilute phosphoric acid, which is applied in the chemical industry, can solve the problems of severe environmental pollution, equipment corrosion and scaling, and achieve the effect of preventing serious corrosion problems

Inactive Publication Date: 2007-05-09
WUHAN CHEM COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These devices all have the problems of high energy consumption, environmental pollution, equipment corrosion and serious fouling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Use a φ50×2000 glass tube as the evaporation concentration column. The top of the column is sealed with a rubber stopper. The rubber stopper has three holes, which are the dilute phosphoric acid inlet, the steam outlet and the thermometer socket. There is a small port at the bottom of the concentration column as an outlet for concentrated acid. A φ18×200 side tube is opened about 4cm from the bottom, and a thermometer is inserted to measure the temperature of the organic matter. The kerosene filling height in the column is about 1.5 meters, and an electric heating belt is wound outside the column, and the voltage is controlled by a voltage regulator. Turn on the power, heat the kerosene to 90°C, turn on the vacuum pump, and control the vacuum to 1500P a , Finally open the feed valve, the dilute acid flows into the evaporation and concentration column in drops from the upper tank at a flow rate of 0.3L / h. After about 20 minutes, the discharge valve can be opened to release p...

Embodiment 2

[0013] Fill the column with xylene, turn on the power, heat the xylene to 95°C, open the feed valve, and the dilute acid flows into the evaporation concentration column in drops from the upper tank at a flow rate of 0.3L / h, and it can be opened after about 20 minutes. The feed valve discharges part of the concentrated phosphoric acid until the feed is completed as a cycle. Through five cycles, 30% P 2 O 5 Of wet-process phosphoric acid concentrated to 52%P 2 O 5 Of commercial grade phosphoric acid.

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Abstract

A process for concentrating the wet-method phosphoric acid and other inorganic acids by vacuum (or ordinary-pressure) evaporation is disclosed. A certain quantity of kerosene or xylene is added to the concentrating tower while a certain temp is held. The diluted acid is dropped in the kerosene. In the falling procedure of acid drops, they suck heat from kerosene and evaporate along with the light component of kerosene. After condensed, the oil and water are naturally separated as the phosphoric acid is not soluble to kerosene. Said separated oil can be cyclically used.

Description

Technical field [0001] The invention relates to a method for concentrating wet-process phosphoric acid by evaporation under reduced pressure (or normal pressure), and belongs to the chemical industry field. Background technique [0002] Usually contains 28-32% P 2 O 5 The wet-process phosphoric acid must be concentrated to 50-53% P 2 O 5 Of commercial grade phosphoric acid. At present, the concentration of wet-process phosphoric acid mainly adopts steam-heated evaporator, bubble concentrator, submerged combustion evaporator and external heating cycle vacuum evaporator. These devices all have the problems of high energy consumption, environmental pollution, equipment corrosion and serious scaling. Summary of the invention [0003] The invention adopts the principle of reduced pressure evaporation and steam distillation. The evaporation tower contains kerosene or xylene. Kerosene or xylene and phosphoric acid are incompatible with each other. Kerosene or xylene is used as the heat...

Claims

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Application Information

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IPC IPC(8): C01B25/234B01D1/00
Inventor 陈中包传平徐旺生陈古圣
Owner WUHAN CHEM COLLEGE
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