Decomposition method for sodium phenate of low-temperature coal tar

A low-temperature coal tar and sodium phenate technology, which is applied in tar processing, tar processing through distillation, and petroleum industry, can solve the problems of reducing the yield of coal tar hydrogenation to fuel, polluting the environment, and complex process flow, etc. To achieve the effect of good application prospects

Inactive Publication Date: 2013-04-24
SHAANXI COAL & CHEM TECH INST
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  • Abstract
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Problems solved by technology

Although this method is simple, it produces a large amount of waste acid and alkali, pollutes the environment, corrodes equipment, and damages the health of operators.
Although there is a patent (CN200820014904.X) that uses carbon dioxide instead of sulfuric acid to decompose sodium phenol salt, this process will also produce a large amount of sodium carbonate salt that is not easy to handle, and the decomposition reaction is incomplete and needs to be repeated many times, resulting in a complicated process.
The second is to use the solvent extraction method (CN201110102049.4), using polyol compounds as extraction agents to extract phenolic compounds in low-temperature coal tar. This method has less pollution, but there are still many problems to be solved: 1. Using extraction and stripping , multi-stage extraction and other methods, the operation is complicated, and the equipment cost is increased; 2, because it involves the recovery of the extractant, it is necessary to distill and separate multiple times, which consumes a lot of energy; 3, due to the extraction method, it is inevitable that some neutral The oil is carried into the phenolic compounds, which reduces the yield of hydrogenation of residual coal tar to fuel in the next step

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  • Decomposition method for sodium phenate of low-temperature coal tar

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specific Embodiment approach

[0018] Such as figure 1 As shown, it is a bipolar membrane electrodialysis device adopted for the decomposition method of low-temperature coal tar phenolic sodium salt. The membrane device is composed of two bipolar membranes and a positive membrane as the basic unit, which is divided into an alkali solution chamber and a feed chamber. , the bipolar membrane is BP-1E membrane made in Japan, the positive membrane is FT-FKB membrane made in Germany, and the area of ​​a single membrane is 0.02m 2 , The membrane spacing is 8mm. At both ends of the membrane are the cathode and the anode, which are connected to the two stages of the DC power supply. The concentration of 40-60g / L sodium hydroxide aqueous solution is fed into the lye chamber, the circulating flow rate of the solution is 18-22mL / min, and the mixed phenol sodium salt solution obtained after alkali treatment of low-temperature coal tar distillation distillate oil is fed into the feed chamber, The solution concentration...

Embodiment

[0020] Weigh about 1 kg of low-temperature coal tar and put it into a laboratory atmospheric distillation device, add a small amount of zeolite into the flask, and heat and distill to obtain distillate oil with a boiling point less than 300°C. Add 100g of the distillate to 400g of 10% sodium hydroxide aqueous solution, heat to 50°C, stir and mix thoroughly, cool to room temperature, let stand to separate layers, separate the water phase, and mix the aqueous solution with a concentration of phenol sodium salt of 102g / L.

[0021] A bipolar membrane electrodialysis device such as figure 1 As shown, the membrane device is composed of two bipolar membranes and a positive membrane as the basic unit, which is divided into a feed chamber and an alkali solution chamber. The bipolar membrane is a BP-1E membrane made in Japan, and the positive membrane is FT made in Germany. -FKB type membrane, single membrane area is 0.02m 2 , The membrane spacing is 8mm. The sodium hydroxide aqueou...

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Abstract

The invention discloses a decomposition method for sodium phenate of low-temperature coal tar. The decomposition method comprises the following steps of decomposing mixed sodium phenate obtained after alkali treatment of the low-temperature coal tar by a bipolar membrane electrodialysis device consisting of two bipolar membranes and one cationic membrane served as a basic unit; and obtaining a mixed phenol compound by an electrochemistry method, and applying the produced sodium hydroxide to the production of the sodium phenate. According to the decomposition method, the problem that a large amount of acid and alkali waste water is drained in the conventional coal tar treatment technology is effectively solved, and the decomposition method is a green chemical technology.

Description

technical field [0001] The invention relates to a new method for decomposing phenolic sodium salt in the low-temperature coal tar processing and production process, which can obtain mixed phenol compounds from the low-temperature coal tar, and is suitable for technical transformation and new construction projects in the coal tar processing industry. Background technique [0002] Low-temperature coal tar is a liquid product obtained by pyrolysis of coal below 800°C. Its composition characteristics and processing methods are quite different from those of high-temperature coal tar. It contains dozens of multi-substituted phenolic compounds such as phenol, cresol, and xylenol. , the content of asphaltene is also higher than that of high temperature coal tar. If the processing technology of high-temperature coal tar is used to process low-temperature coal tar, it will not only corrode the equipment, but also make it difficult to separate oil and water because the density of low-t...

Claims

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Application Information

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IPC IPC(8): C10C1/00C10C1/04C10C1/10
Inventor 杨永忠闵小建李向东郑化安尚建选张生军唐应吉刘双泰
Owner SHAANXI COAL & CHEM TECH INST
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