Method for improving yield of concentrated phosphoric acid

A production method, phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low production start-up rate and load rate, poor heat transfer effect, etc., to achieve increased phosphoric acid output and high application value Effect

Active Publication Date: 2010-07-14
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Due to the concentration of phosphoric acid in the production process, impurities such as calcium salts and fluorosilicates reach a supersaturated state, and crystallization continues to adhere to the tube wall of the graphite heat exchanger, resulting in poor heat transfer effects. The total heat transfer coefficient can range from 1400W / ( m 2 ··℃) drops to 930W / (m 2 ··℃), so it needs to be boiled and cleaned regularly. The production cycle is generally about 15 days, and the production start-up rate and load rate are relatively low.

Method used

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  • Method for improving yield of concentrated phosphoric acid
  • Method for improving yield of concentrated phosphoric acid
  • Method for improving yield of concentrated phosphoric acid

Examples

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Embodiment 1

[0036] Follow the steps below to concentrate phosphoric acid:

[0037] The concentration system adopts vacuum evaporation and forced circulation process. The circulation loop consists of a flash chamber, a graphite heat exchanger, an axial flow circulation pump (with a speed of 500 rpm) and connecting pipes. Dilute phosphoric acid with a mass percentage concentration of 26-28% is added to the circulation loop by the dilute acid feed pump before the circulation pump and mixed with a large amount of circulating concentrated acid. The low-pressure steam enters the graphite heat exchanger for heat exchange with the circulating acid. The scale inhibitor phosphonocarboxylic acid polymer is added to the graphite heat exchanger. The inlet steam pressure of the graphite heat exchanger is 105KPa, and the acid inlet temperature is 77.3°C. The steam temperature is 121°C, the system is under an absolute pressure of about 13KPa, the phosphoric acid boils vigorously, and the water in the di...

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Abstract

The invention discloses a method for improving the yield of concentrated phosphoric acid, which is characterized by concentrating the phosphoric acid in the concentrating step in the method for producing the phosphoric acid, wherein in the concentrating step, the speed of an axial-flow pump is 500-510r / min; scale inhibitors are added into a graphite heat exchanger; the steam admission pressure of the heat exchanger is 100-110KPa, the temperature of the steam is 120-122 DEG C, the absolute pressure of a flash chamber is 10-16KPa and the acid feeding temperature of the heat exchanger is 75-80 DEG C. By the method provided by the invention, the cycle of concentrating operation reaches over 30 days, the yield of the phosphoric acid is substantially improved and completely meets the requirement of downstream production, and the method has high application value in the field of phosphoric acid production.

Description

technical field [0001] The invention relates to a phosphoric acid production process, in particular to a method for increasing the output of concentrated phosphoric acid. Background technique [0002] In the phosphoric acid production process, if the production capacity of the concentration process fails to reach the design capacity, it will have a great impact on the entire production process, so there is a saying in the industry of "concentration bottleneck". Both domestic and foreign manufacturers and design units have no good solutions, which has always been a major industry problem. The technical solution for increasing the concentration yield has high technical content and strong practicability in the phosphate compound fertilizer industry, can solve the problem of phosphoric acid production, and is of great significance for improving the economic benefits of enterprises. [0003] The annual designed production capacity of Dayukou phosphoric acid plant is 200,000 tons...

Claims

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Application Information

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IPC IPC(8): C01B25/234
Inventor 陈以明
Owner CHINA NAT OFFSHORE OIL CORP
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