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Quality improving treatment method of tar

A treatment method, tar technology, applied in the direction of tar extraction and processing through chemical methods, can solve the problems of high cost of environmental pollution waste liquid treatment, high cost of raw materials or catalysts, high cost of phenol, etc., to achieve easy industrial production and prominent prices Advantages, the effect of low price

Active Publication Date: 2019-05-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In comparison, among the latter two technologies, due to the high cost of raw materials or catalysts, and the large application of toxic reagents, the risk of environmental pollution and the high cost of waste liquid treatment, it is difficult to be widely used
At present, the technical solution using phenol and methanol as raw materials is the most widely used, but there is also the disadvantage of high cost of phenol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The straw pyrolysis tar under the pyrolysis condition of 500°C was uniformly mixed with methanol, and 20 g of catalyst pellets (Al 2 o 3 , 3mm diameter) placed in the middle of the fixed bed tubular reactor, then the reaction mixture is sent from the inlet of the fixed bed tubular reactor through a peristaltic pump, and the reactant system flows through the catalyst bed layer placed in the fixed bed and the conversion reaction occurs , the resulting gas phase product flows out from the outlet of the tubular reactor and enters the condensing system, and is cooled to become a liquid phase and collected. The mass ratio of tar to methanol is 1:1, the reaction temperature is 400°C, and the volumetric space velocity is 900h -1 , The reaction time is 2h.

[0051] The resulting liquid product yield after the reaction is 72%. Under the condition of ignoring the remaining methanol content in the product, the hexamethylbenzene content (mass spectrum area fraction) is 58%, the pe...

Embodiment 2

[0053] The lignite pyrolysis tar under the pyrolysis condition of 800°C was uniformly mixed with methanol, and 20 g of catalyst pellets (SAPO-34 molecular sieve, 3 mm in diameter) were placed in the middle of the fixed-bed tubular reactor, and then the reaction mixture was transferred from The fixed bed tubular reactor is fed into the inlet, the reactant system flows through the catalyst bed placed in the fixed bed and undergoes conversion reaction, the gas phase product obtained flows out from the tubular reactor outlet and enters the condensation system, and is cooled to become a liquid phase to obtain collect. The mass ratio of tar to methanol is 1:5, the reaction temperature is 600°C, and the volumetric space velocity is 2400h -1 , The reaction time is 2h.

[0054] The resulting liquid product yield after the reaction is 61%. Under the condition of ignoring the remaining methanol content in the product, the content of hexamethylbenzene (mass spectrum area fraction) is 68%...

Embodiment 3

[0056] Straw direct liquefied oil under hydrogen atmosphere at 420°C was uniformly mixed with methanol, and 20 g of catalyst pellets (Y molecular sieve, 3 mm in diameter) were placed in the middle of the fixed-bed tubular reactor, and then the reaction mixture was transferred from the fixed-bed tube through a peristaltic pump. The reactant system flows through the catalyst bed placed in the fixed bed and undergoes conversion reaction, and the gas phase product obtained flows out from the outlet of the tubular reactor and enters the condensation system, which is cooled to become a liquid phase and collected. The mass ratio of tar to methanol is 1:2, the reaction temperature is 500°C, and the volume space velocity is 1400h -1 , The reaction time is 2h.

[0057] The resulting liquid product yield after the reaction is 68%. Under the condition of excluding the remaining methanol content in the product, the content of hexamethylbenzene (mass spectrum area fraction) is 66%, and the ...

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PUM

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Abstract

The invention provides a quality improving treatment method of tar. The quality improving treatment method of the tar comprises the following steps: tar raw materials and small molecule alcohols are introduced into a solid acid catalyst after being mixed; and aromatic hydrocarbon and phenol components in the tar raw materials have high temperature gas phase catalytic conversion reaction with the small molecule alcohols under a catalytic effect of the solid acid catalyst to obtain a gas phase product. According to the quality improving treatment method of the tar, high temperature gas phase catalytic conversion is carried out on the tar and the small molecule alcohols after mixing; by using the solid acid catalyst, the aromatic hydrocarbon and creosote components in the tar are enabled to react with the small molecule alcohols; and the aromatic hydrocarbons and the phenol in the tar are converted into a high-value product with pentamethylbenzene, hexamethylbenzene, pentaethylbenzene orhexaethylbenzene as a main component; moreover, a small quantity of small molecule oxygen-containing components contained in the tar are deoxygenated to be converted to obtain products, such as low boiling point alkanes and condensed ring hydrocarbon, and a gas product with higher heat value. The quality improving treatment method of the tar, provided by the invention, has the advantages that thetar raw materials and the catalyst are cheap, the tar treatment process is simple and efficient, industrial production is easy to realize, and the technological process is pollution-free.

Description

technical field [0001] The invention belongs to the technical field of quality improvement, and relates to a method for upgrading tar, in particular to a method of using a solid acid catalyst to catalyze components such as aromatic hydrocarbons and phenols in tar raw materials and small molecular alcohols to undergo high-temperature gas-phase catalytic conversion reactions Approach. Background technique [0002] Tar is a black or dark brown viscous liquid obtained in the process of coal or biomass dry distillation or direct liquefaction (conversion in a reducing atmosphere such as hydrogen, carbon monoxide, or synthetic gas), with a special odor. Flammable and corrosive, it is a complex mixture of highly aromatic hydrocarbons, an inexpensive source of fuel and a valuable chemical resource. However, because tar, especially low-temperature pyrolysis tar, is rich in a large amount of creosote and other oxygen-containing components, resulting in low calorific value and high aci...

Claims

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Application Information

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IPC IPC(8): C10C1/20
Inventor 王泽李松庚宋文立袁博
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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