Preparation method of electronic-grade high-purity hydrogen chloride

A hydrogen chloride, electronic-grade technology, applied in the direction of chlorine/hydrogen chloride, chemical instruments and methods, chlorine/hydrogen chloride purification, etc., can solve the problems of great social harm, violent boiling of mixed acid, serious material consumption, etc., and achieve safety and environmental protection pressure Effects of lifting, purification and yield increase, reduction in equipment construction requirements
CN110255501APending Publication Date: 2019-09-20SUZHOU JINHONG GAS CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU JINHONG GAS CO LTD
Publication Date
2019-09-20

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Abstract

The invention discloses a preparation method of electronic-grade high-purity hydrogen chloride. The preparation method includes subjecting toluene and chlorine to a chlorination reaction to produce chlorotoluene and a by-product, namely a hydrogen chloride gas, dewatering, liquefying and rectifying the by-product as a raw material to remove light components, and further performing rectification to remove heavy components to obtain the electronic-grade high-purity hydrogen chloride. The preparation method has the advantages that an original process for converting hydrogen chloride produced after toluene chlorination into hydrochloric acid is changed into a method for producing the electronic-grade high-purity hydrogen chloride, and the industrial hydrochloric acid is basically surplus waste liquid in actual chemical production and needs to be treated; by the preparation method, waste is turned into treasures, and new pollution is avoided.
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Description

technical field

[0001] The invention relates to the field of purification, in particular to a method for preparing electronic-grade high-purity hydrogen chloride. Background technique

[0002] The prior art production of hydrogen chloride mainly adopts the following methods:

[0003] Method 1: synthetic method;

[0004] 3.1.1. Basic principle: Combustion of hydrogen and chlorine to generate hydrogen chloride H 2 +CL 2 โ†’2HCL

[0005] 3.1.2. Disadvantages and drawbacks:

[0006] (1) It is more difficult to ignite;

[0007] (2) Once the flameout occurs during the combustion process, it will be troublesome to re-ignite, there is a risk of explosion, and the safety hazard is relatively large;

[0008] (3) The combustion process brings huge heat energy and is cooled by water. Once the reactor is broken down, a huge acidic liquid hydrochloric acid is formed, which is difficult to handle, and it is a precursor drug. Poor management and potential social harm are huge;

[0009] ...

Claims

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