Method for purifying waste hydrochloric acid

A technology for waste hydrochloric acid and hydrochloric acid, applied in chemical instruments and methods, separation methods, preparation of iron compounds, etc., can solve problems such as energy consumption, complex process steps, difficulties, etc., to improve cycle efficiency, reduce manufacturing costs, and simplify processes. Effect

Active Publication Date: 2018-07-17
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are difficulties in applying this method to practical processes due to increased process equipment and maintenance costs
[0025] As mentioned above, regarding the conventional method of removing Fe from waste hydrochloric acid, due to the complicated process steps, not only energy consumption and cost are high, but also the efficiency of removing free residual chlorine from waste hydrochloric acid is also low

Method used

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  • Method for purifying waste hydrochloric acid
  • Method for purifying waste hydrochloric acid
  • Method for purifying waste hydrochloric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] The concentration (S0) of iron (Fe) ions contained in 100 ml of waste hydrochloric acid was measured by inductively coupled plasma mass spectrometry.

[0117] Subsequently, trioctylamine (iron (Fe) ion component contained in waste hydrochloric acid: extractant = 1 mol: 40 mol) as an extractant was dissolved in 100 ml of toluene as an organic solvent to prepare an extract (S1 ).

[0118] Next, the extract is added to 100 m of waste hydrochloric acid, and the metal components contained in the waste hydrochloric acid are extracted with an organic solvent while stirring at a speed of 200 rpm at normal temperature for 60 seconds (S2).

[0119] After stirring to reach equilibrium, the mixed liquid of organic solvent and waste hydrochloric acid is added to the separator, shaken for about 20 seconds, and then left to stand to separate (separate) the mixed liquid into organic solvent and waste hydrochloric acid layers containing metal components ( S3).

[0120] Subsequently, purified h...

Embodiment 2

[0124] The purified hydrochloric acid was obtained in the same manner as in Example 1, except that the amount of the extractant in step S1 of Example 1 was such that the molar ratio of Fe: extractant contained in the waste hydrochloric acid was 1:60. The residual metal concentration in the purified hydrochloric acid was measured, and the results are shown in Table 1 below.

Embodiment 3

[0126] Except that cyclohexane was used instead of toluene in Example 1, purified hydrochloric acid was obtained in the same manner as in Example 1. The residual metal concentration and TOC in the purified hydrochloric acid were measured, and the results are shown in Table 1 and Table 2 below.

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PUM

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Abstract

The present invention relates to a method for purifying waste hydrochloric acid and, specifically, to a method for purifying waste hydrochloric acid, comprising the steps of: (S1) preparing an extraction solution by dissolving an extractant in an organic solvent; (S2) extracting a metal component with an organic solvent by injecting the extraction solution into waste hydrochloric acid; (S3) phaseseparating a water hydrochloric acid layer and the organic solvent containing the metal component; and (S4) obtaining purified hydrochloric acid by recovering the phase separated (fractionated) waterhydrochloric acid layer, wherein at least 40 mol of the extractant is used on the basis of 1 mol of Fe contained in the waste hydrochloric acid, and the waste hydrochloric acid and the extraction solution are mixed in a volume ratio of waste hydrochloric acid : extraction solution of 1 to 0.1-1.

Description

Technical field [0001] Cross references to related applications [0002] This application requires Korean Patent Application No. 10-2016-0148633 filed at the Korean Intellectual Property Office on November 9, 2016 and Korean Patent Application No. 10-2017 filed at the Korean Intellectual Property Office on October 24, 2017 -0138499 rights, the disclosures of these two applications are fully incorporated into this specification by reference. Technical field [0003] The invention relates to a method for purifying waste hydrochloric acid. Background technique [0004] Dichloroethane (EDC, 1,2-dichloroethane) is a substance produced during the synthesis reaction of vinyl chloride monomer (see the following reaction formula 1), which can be directly chlorinated through the reaction of ethylene and chlorine The method and the preparation by the reaction of ethylene, hydrogen chloride and air (oxygen) using oxychlorination. [0005] [Reaction formula 1] [0006] C 2 H 4 +Cl 2 (Or HCl)→CH...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02
CPCC01B7/01B01D11/0492B01D11/0457C01G49/0009C23G1/36B01D11/0292B01D11/0288B01D11/0484B01D2257/60C01B7/0737C01P2006/80
Inventor 严熙骏李东哲金练伊崔瀞颢
Owner LG CHEM LTD
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