Method for preparing hydrogen fluoride and coproducing white carbon black with silicon tetrafluoride

A silicon tetrafluoride, hydrogen fluoride technology, applied in the direction of fluorine/hydrogen fluoride, silicon oxide, silicon dioxide, etc., can solve the problems of poor production safety, difficult filtration, incomplete conversion, etc., achieve huge environmental and social benefits, promote The effect of healthy and sustainable development and superior product quality

Active Publication Date: 2012-02-15
DUOFUDUO KUNMING TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In summary, the process has the following shortcomings: first, the conversion is incomplete and the main content is low; second, the equipment corrosion problem has not been fundamentally solved; third, the energy consumption is high, and industrialization is uneconomical; fourth, the by-product white carbon black is difficult to collect Or difficult to filter; Fifth, secondary pollution is li

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  • Method for preparing hydrogen fluoride and coproducing white carbon black with silicon tetrafluoride
  • Method for preparing hydrogen fluoride and coproducing white carbon black with silicon tetrafluoride

Examples

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Example Embodiment

[0021] Example 1

[0022] 700kg of crude silicon tetrafluoride gas produced by phosphate fertilizer is passed through a 300-mesh bag filter to remove sodium fluoride dust in the gas, and then passed through a two-stage activated carbon absorption column and a first-stage absorption column filled with 100-300℃ vacuum conditions The activated carbon is activated for 4 hours, and the secondary absorption column is filled with the activated carbon for 4 hours under the vacuum condition of 300-700℃. The activated carbon obtained by this method has higher activity and the lowest adsorption water content ( 2 , O 2 , H 2 , CO and CH 4 After the liquefied silicon tetrafluoride is gasified, it enters the next process of reaction. At this time, 684kg of silicon tetrafluoride gas with a purity of 99.99% is obtained.

[0023] Pass the purified 684kg silicon tetrafluoride gas and 245kg steam into the hydrolysis reactor at a rate of 1:2, and carry out the hydrolysis reaction at 300°C; the 530kg ...

Example Embodiment

[0024] Example 2

[0025] Purify 1000 kg of crude silicon tetrafluoride gas produced by phosphate fertilizer. The purification method is the same as the silicon tetrafluoride purification method in Example 1. The corresponding control conditions can be arbitrarily selected within its range to obtain tetrafluoride with a purity of 99.99%. 978kg of silicon fluoride gas. Then 978kg of silicon tetrafluoride gas and 337kg of water vapor are fed into the hydrolysis reactor at a rate of 1:2, and the hydrolysis reaction is carried out at 500°C; the 750kg of crude hydrogen fluoride gas produced by the hydrolysis is first introduced into the dust collector to remove dust and other solid impurities. The dust collector adopts a plate type dust collector and a bag type dust collector. The hydrogen fluoride gas after dust removal enters the first-stage rectification tower, and the condensation temperature at the top of the tower is controlled at 50 ℃, so that the hydrogen fluoride is condense...

Example Embodiment

[0026] Example 3

[0027] Purify 800 kg of crude silicon tetrafluoride gas by-product of phosphate fertilizer. The purification method is the same as the purification method of silicon tetrafluoride in Example 1. The corresponding control conditions can be arbitrarily selected within the range to obtain tetrafluoride with a purity of 99.99%. 785kg of silicon fluoride gas. Then 785kg of silicon tetrafluoride gas and 270kg of water vapor are introduced into the hydrolysis reactor at a rate of 1:2, and the hydrolysis reaction is carried out at 200°C; the 600kg of crude hydrogen fluoride gas produced by the hydrolysis is first introduced into the dust collector to remove dust and other solid impurities. The dust collector adopts a plate type dust collector and a bag type dust collector. The hydrogen fluoride gas after dust removal enters the first-stage rectification tower, and the condensation temperature at the top of the tower is controlled at 30 ℃, so that the hydrogen fluoride ...

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Abstract

The invention discloses a method for preparing hydrogen fluoride and coproducing white carbon black with silicon tetrafluoride, comprising the following steps: letting crude silicon tetrafluoride as byproduct from a phosphate fertilizer be subject to dedusting and dehumidification, then reacting with steam with the reacting dose for hydrolysis at the temperature of 200-800 DEG C, carrying out gas-solid separation on the obtained products to respectively obtain hydrogen fluoride and white carbon black. According to the invention, the low grade silicon tetrafluoride as byproduct of fluorine resources is used for preparing high purity absolute hydrogen fluoride and coproducing gas phase white carbon black, thus a novel method for producing gas phase white carbon black is developed, a novel technology of preparing gas phase white carbon black at low temperature is realized, the energy consumption in the preparation is reduced, the raw material is easily available, the price is low, the utilization rate of the raw material is low, and a cost advantage is achieved compared with traditional production method of absolute hydrogen fluoride. The invention can create good economical benefits, and bring huge environmental benefits and social benefits, belonging to a clean production process.

Description

technical field [0001] The invention relates to a method for preparing hydrofluoric acid from silicon tetrafluoride and co-producing white carbon black, belonging to the technical field of inorganic chemical industry. Background technique [0002] As a basic fluorine chemical product, hydrogen fluoride is mainly used in the production of refrigerants, fluorine resins, fluoride salts, fluorine rubber, fluorine-containing intermediates and fine chemicals, with broad market prospects. In particular, high-quality hydrogen fluoride is the main raw material for high-end fluoride production, and its quality is directly determined by the raw material. However, at present, the hydrogen fluoride production methods in the world are almost all fluorite-sulfuric acid method, and the hydrogen fluoride products produced by this method cannot meet the requirements for the production of high-end fluorides, regardless of the content of metal impurities or non-metal content. [0003] As a str...

Claims

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Application Information

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IPC IPC(8): C01B7/19C01B33/12
Inventor 李世江侯红军杨华春薛旭金于贺华刘海霞王建萍韩建军陈宏伟
Owner DUOFUDUO KUNMING TECH DEV CO LTD
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