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Phosphoric acid evaporation process and device thereof

A process, phosphoric acid technology, applied in phosphorus compounds, chemical industry, sustainable manufacturing/processing, etc., can solve the problems of large investment, high operating cost and high maintenance cost of phosphoric acid concentration plant

Inactive Publication Date: 2011-11-23
NANTONG JINGTONG GRAPHITE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these lead to large investment, high operating costs and high maintenance costs for phosphoric acid concentrators.

Method used

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  • Phosphoric acid evaporation process and device thereof
  • Phosphoric acid evaporation process and device thereof
  • Phosphoric acid evaporation process and device thereof

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0013] as attached figure 1 As shown, (1) Material introduction Dilute phosphoric acid enters through the top of the heater, and there are three-layer disc distributors inside, so that dilute phosphoric acid can be evenly distributed to the entrance of each heat exchange tube, ensuring that dilute phosphoric acid can flow along the inside of the heat exchange tube. The wall flows downward evenly in the form of a film; (2) The dilute phosphoric acid dehydration steam enters the heater from the side wall of the heater, and the steam enters the heater shell to heat the outer wall of the heat exchange tube, and the heat is transferred to the inside of the tube through the tube wall. The dilute phosphoric acid is heated during the flow process, and the water in it is evaporated; (3) the condensed water is collected from the steam, and the condensed ...

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Abstract

The invention relates to a phosphoric acid evaporation process, and a device which is mainly used in the phosphoric acid evaporation process; the process comprises the following steps: allowing dilute phosphoric acid to enter the top of a graphite falling film evaporation heater, and to flow downwards in a membrane mode along the inner wall of a heat exchange tube, introducing steam from the side wall of the heater, heating the outer wall of the heat exchange tube, transferring heat to the dilute phosphoric acid in the tube through the tube wall, heating the dilute phosphoric acid during flowing, and evaporating the water. Compared with traditional circulating pump external-circulation single-effect evaporation processes, the process of the invention has high evaporation intensity, requires less heat exchangers and circulating pumps to be allocated under equal production capacity than the circulating pump external-circulation single-effect evaporation processes, and can greatly reduce investment cost, operation cost, and maintenance cost of a phosphoric acid concentration device.

Description

Technical field [0001] The invention relates to a refining process of chemical raw materials and a device thereof, and is mainly used in a phosphoric acid evaporation process. Background technique [0002] In the wet phosphoric acid production process, phosphoric acid concentration is a core process and the most energy-consuming process. It needs to concentrate the concentration of phosphoric acid solution from 20% to 25% to 48% to 50%. Concentration is accomplished using a single-effect evaporation process with an external circulation pump. The heating medium is saturated water vapor. The steam consumption is large. Usually, P per ton of concentration is used. 2 O 5 Approximately 1.8~2 tons of low-pressure steam is consumed. In order to maintain sufficient material circulation, the power of the circulation pump is also consumed. Most of the heat exchangers are tube type, with small evaporation intensity and large area. These all lead to larger investment, higher opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234
CPCY02P20/10
Inventor 陈汉军陈汉明杨钧张茂海陈玉培
Owner NANTONG JINGTONG GRAPHITE EQUIP
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