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Method for separating and recycling fluorine-containing concentrated sulfuric acid

A technology for separation and recovery of concentrated sulfuric acid, applied in the directions of sulfur trioxide/sulfuric acid, hydrogen fluoride, fluorine/hydrogen fluoride, etc., can solve the problem of difficult disposal of fluorine-containing concentrated sulfuric acid, and achieve improved equipment utilization, high recovery rate, and high absorption efficiency. Effect

Active Publication Date: 2021-12-14
重庆微而易科技有限公司
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Problems solved by technology

It not only solves the problem of difficult disposal of fluorine-containing concentrated sulfuric acid, but also obtains hydrofluoric acid products and dilute sulfuric acid products that can meet the production purity requirements, truly realizing the transformation of waste into treasure

Method used

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  • Method for separating and recycling fluorine-containing concentrated sulfuric acid

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Embodiment 1

[0049] Example 1 Separation and recovery of sulfuric acid and hydrofluoric acid from fluorine-containing concentrated sulfuric acid waste acid

[0050] See the process flow figure 1 , the specific process steps are as follows:

[0051] 1) First inject 30% desalted water into the secondary circulation tank V2, turn on the secondary circulation pump P2 for circulation, and pump part of the desalted water into the primary circulation tank V1 to the 30% liquid level, and turn on the primary circulation pump P1 loops;

[0052] 2) The fluorine-containing concentrated sulfuric acid is controlled by a flow meter and a regulating valve, slowly connected to the primary circulation tank V1, and circulated through the circulation pump. When the circulating liquid level reaches a certain height, it overflows to the secondary circulation tank V2 to continue circulation. The temperature of the circulation process is controlled at 120°C ~ 140°C, and the pressure is 5kpa. The HF generated du...

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Abstract

The invention discloses a method for separating and recycling fluorine-containing concentrated sulfuric acid, which comprises four parts of desalted water two-stage circulation, HF separation, HF absorption and HF tail gas absorption. According to the method, the fluorine-containing concentrated sulfuric acid is separated, a hydrofluoric acid product meeting production requirements is separated and recycled, and a dilute sulfuric acid product with purity meeting requirements is obtained. Comprehensive resource regeneration and utilization of the fluorine-containing waste concentrated sulfuric acid are realized.

Description

technical field [0001] The invention belongs to the field of fine chemistry and chemical industry, and specifically relates to a method for separating and recovering concentrated fluorine-containing sulfuric acid, in particular to a continuous production process and method for the regeneration and utilization of comprehensive resources of concentrated fluorine-containing sulfuric acid. Background technique [0002] With the development of fluorine chemical industry in recent years, hydrofluoric acid has been widely used in lithium battery industry, electronics industry, photovoltaic industry and traditional downstream industries of fluorine chemical industry. When hydrofluoric acid is used in the form of HF gas, it must involve HF For the purification of gas, concentrated sulfuric acid is often used for purification, which inevitably produces waste acid containing fluorine-containing concentrated sulfuric acid. increased sharply. [0003] The existing fluorine-containing wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C01B7/19
CPCC01B17/90C01B7/196
Inventor 何睿鸣张月娥彭丽华
Owner 重庆微而易科技有限公司
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