Method for preparing dibutyl phthalate by electrochemically degrading lignin in ferrous sulfate solution

A technology of dibutyl phthalate, ferrous sulfate solution, applied in chemical instruments and methods, preparation of carboxylate, preparation of organic compounds, etc., can solve the problem of low yield, high production cost, and difficulty in industrialized production, etc. problem, to achieve the effect of low cost, alleviation of environmental pressure, and environmental friendliness

Active Publication Date: 2013-12-25
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation of DBP by biological method is simple and does not produce secondary pollution, the production cost is high, the yield is low and it is difficult to realize industrial production.

Method used

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  • Method for preparing dibutyl phthalate by electrochemically degrading lignin in ferrous sulfate solution
  • Method for preparing dibutyl phthalate by electrochemically degrading lignin in ferrous sulfate solution
  • Method for preparing dibutyl phthalate by electrochemically degrading lignin in ferrous sulfate solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Disperse 4g lignin in 400ml FeSO 4 In the solution (0.05mmol / L), the lignin content is 10g / L, plus H 2 SO 4 (0.86mol / L) solution to adjust the pH of the solution to 3, and petroleum ether is used as the extract and placed in the extractor.

[0031] (2) Take 19.5 (3×6.5) cm 2Titanium mesh, Ti / La-Ce-α-β-PbO doped with La and Ce metals prepared according to related electrodeposition methods 2 The electrode (Separation and Purification Technology, 2013, (104): 9-16) is the working electrode. Take 14 (2×7) cm 2 The copper sheet was polished with 800-grit sandpaper, rinsed with distilled water and used as an auxiliary electrode.

[0032] (3) Add the prepared lignin suspension into the electrolyzer device, and electrocatalyze the degradation of lignin with a constant current, with a current density of 15mA / cm 2 , degradation reaction 4h, gas chromatography analysis showed that the concentration of DBP in the extract was 1.45g / L.

[0033] (4) After separating the or...

Embodiment 2-7

[0038] Examples 2-7 show that the dispersion concentration of lignin in ferrous sulfate solution (0.01mmol / L-0.15mmol / L) is 10g / L, and the current density is 15mA / cm 2 , under the condition that the reaction time is 4h, pH=3, the influence of different concentrations of ferrous sulfate solution on the yield of the product dibutyl phthalate (DBP) (see Table 1), other operating steps are the same as in Example 1.

[0039] The influence of table 1 ferrous sulfate solution concentration on the output of product dibutyl phthalate (DBP)

[0040]

Embodiment 8-14

[0042] Examples 8-14 are the dispersion concentration of lignin in ferrous sulfate solution (0.05mmol / L) is 10g / L, and the current density is 15mA / cm 2 , the effect of different pH values ​​on the yield of the product dibutyl phthalate (DBP) under the condition of a reaction time of 4 h (see Table 2), and other operating steps are the same as in Example 1.

[0043] The influence of table 2 pH value on the output of dibutyl phthalate (DBP)

[0044] project pH value DBP concentration (g / L) Example 8 1 1.82 Example 9 2 1.84 Example 10 3 1.45 Example 11 4 1.79 Example 12 5 1.63 Example 13 6 1.62 Example 14 7 1.60

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Abstract

The invention relates to a method for preparing dibutyl phthalate by electrochemically degrading lignin in a ferrous sulfate solution. In the method, an electrolytic cell is formed by using an M-doped Ti/M-alpha-beta-PBO2 titanium-based double-layer lead dioxide electrode as a work electrode, a Cu sheet electrode as an auxiliary electrode and a standard saturated calomel electrode as a reference electrode; and a circulating pump is connected with an extractor, so as to form an integrated process for electrochemical degrading lignin and extracting and separating degraded products continuously. Products generated during an electrolytic process can be extracted in time, thereby preventing the products from being further degraded into other substances. Besides, the method is mild in reaction conditions and relatively high in efficiency, is environment-friendly, and has good development prospects and industrial application values.

Description

technical field [0001] The invention relates to providing a method for preparing dibutyl phthalate by electrochemically degrading lignin in a ferrous sulfate solution, and belongs to the technical field of biomass energy chemical industry. Background technique [0002] Lignin is the second largest natural polymer material after cellulose in nature, accounting for about a quarter of woody plants, and 40% of the biologically produced energy is stored in lignin, known as It is one of the most abundant green resources available in the 21st century. The structure of lignin is complex, with a three-dimensional network structure with phenylpropane structure as the basic structural unit. (Coordination Chemistry Reviews, 2010, 254:1854-1879) proposed that the structure of lignin is shown in the following formula. If it can be effectively degraded, many useful organic compounds will be obtained. [0003] [0004] At present, only 1% of the by-product lignin produced by the paper ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/02C25B15/08C07C69/80C07C67/58C25B3/23
CPCY02P20/10
Inventor 黎钢尹小莲杨芳张松梅
Owner HEBEI UNIV OF TECH
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