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Treatment method for spent caustic soda

A technology of spent caustic soda and caustic soda, applied in the field of spent caustic soda, can solve problems such as large inorganic sludge

Inactive Publication Date: 2014-06-04
SK ENERGY CO LTD (KR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with the Fenton oxidation treatment method is that it produces a large amount of inorganic sludge

Method used

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  • Treatment method for spent caustic soda
  • Treatment method for spent caustic soda
  • Treatment method for spent caustic soda

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] (1) Physical properties of caustic soda

[0144] Two types of spent caustic soda were used in this example, the spent caustic soda produced by the KMX (Kero Merox) process licensed by Merichem Corporation and UOP Corporation respectively. Its physical properties are shown in Tables 3 and 4 below.

[0145] [table 3]

[0146]

[0147] [Table 4]

[0148]

[0149] (2) The substances used in this example are as follows:

[0150] 1) Sulfuric acid (Aldrich Corp, concentration 98wt%)

[0151] 2) Sodium hydroxide (Aldrich company, dilute sodium hydroxide with distilled water to prepare a solution containing 50wt% sodium hydroxide)

[0152] 3) Hydrogen peroxide (Aldrich company, solution containing 33wt% hydrogen peroxide)

[0153] 4) As an oxidation catalyst, a commercially available spherical catalyst having a particle size of about 1 mm was prepared, which contained iron (III) oxide (main component), about 20 to about 30 wt % potassium based on the weight of iron ox...

Embodiment 2

[0189] Effect of phenol concentration on oxidation reaction temperature and hydrogen peroxide injection dose.

[0190] The spent caustic soda was treated in the same manner as in Test 1 in Example 1, except that the treatment was carried out while changing the oxidation reaction temperature and hydrogen peroxide injection concentration. The reaction temperature before the oxidation reaction was set as the manipulated variable, and the others were set as independent variables. The concentration of phenol was measured with the water analysis kit from HUMAS. When the concentration of phenol is above about 2,000 mg / L, distilled water is added. When the concentration of phenol is below about 2,000 mg / L, the phenol solution is added. Thereby, the content of phenol in the spent caustic soda adjusted by pH is controlled at about 2,000 mg / L. The content of phenol in the finally treated spent caustic soda is shown in Tables 9 and 10 below (average of 10 times).

[0191] [Table 9]

...

Embodiment 3

[0200] Influence of Hydrogen Peroxide Injection Dose on COD

[0201] Treat spent caustic soda with the same method as test 1 and 2 in embodiment 1, difference is to change the injection dose of hydrogen peroxide (aqueous solution), and described hydrogen peroxide is the oxidizing agent used in oxidation treatment reaction, and test result is as follows shown in Tables 11 and 12.

[0202] [Table 11]

[0203] Hydrogen Peroxide Injection Dosage

10

15

20

25

30

35

40

45

COD(mg / L)

3317

3134

2653

2167

2256

2890

3420

4590

[0204] As shown in Table 11, it can be determined that based on about 700 mL of spent caustic soda, the optimal injection dose of the oxidizing agent (hydrogen peroxide) is about 25 mL. In this case, the ratio of oxidant:COD (by weight) is about 2:1. In particular, it was confirmed that when more than 25 mL of hydrogen peroxide was injected, residual unreacted hydrogen peroxid...

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Abstract

An embodiment of the present invention relates to a method for treating spent caustic soda generated from an oil refinery process, a petrochemical process, etc. through a process in which a series of treatment steps are integrated, wherein the method can constitute a process under a mild condition excluding high temperature and / or high pressure conditions and can be advantageous to a post treatment process since the amount of by-products is small.

Description

technical field [0001] The invention relates to a method for treating spent caustic soda. More specifically, the present invention relates to a method for treating spent caustic soda from petroleum refining processes, petrochemical processes, etc., through a process integrating a series of treatments. Background technique [0002] Generally, in order to remove impurities contained in products produced from petroleum refining processes and petrochemical processes, such as hydrogen sulfide, mercaptans (R-SH), organic acids, etc., the products are brought into contact with caustic soda (NaOH) or subjected to washing. Caustic soda (aqueous solution) is a conventional strong base that exists in a white translucent crystalline state, has the property of deliquescence after absorbing moisture in the air, and is used in the form of an aqueous solution obtained by dissolving caustic soda in water. In particular, caustic soda is continuously used as the main reactant for removing im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66C02F1/72C02F9/04B09B3/00C02F103/34
CPCC01D1/36C22B26/10C02F1/66C02F1/72C02F9/00C02F2103/34
Inventor 宋芳彦李星昊尹永植吴承勋
Owner SK ENERGY CO LTD (KR)
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