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Method for extracting 2-methylthiophene and 3-methylthiophene with coking crude benzol

A technology for methylthiophene and coking crude benzene is applied in the refining and extraction of 3-methylthiophene enriched fractions, and in the field of 2-methylthiophene, the problems of low productivity and low product content can be solved, and the recovery rate can be improved, The effect of reducing energy consumption and advanced technological process

Active Publication Date: 2013-05-01
WEIFANG YUANLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing production technology of 2-methylthiophene and 3-methylthiophene in my country mainly uses isoprene to react with sulfur. This technology has low productivity and low content of 2-methylthiophene and 3-methylthiophene products. shortcoming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preheat the coked crude benzene to 80°C and enter the crude benzene light removal tower. The crude benzene light removal tower is an atmospheric distillation with a top temperature of 50°C, a bottom temperature of 100°C, and a reflux ratio of 8 to remove coked crude benzene from the top of the tower. Light components in the medium; put the fraction collected at the bottom of the tower into the crude benzene weight removal tower, carry out negative pressure distillation, control the pressure at 40KPa, top temperature 50°C, bottom temperature 140°C, reflux ratio of 10, and extract from the bottom of the weight removal tower High boilers such as heavy benzene and xylene are produced, and 2-methylthiophene, 3-methylthiophene, benzene, and toluene components are extracted from the top of the tower; the top fraction is put into the crude benzene separation tower, and the vacuum distillation is carried out to control the pressure The temperature is 30 KPa, the top temperature i...

Embodiment 2

[0039] Preheat the coked crude benzene to 90°C, and enter the crude benzene light removal tower, which is atmospheric distillation, with a top temperature of 56°C, a bottom temperature of 103°C, and a reflux ratio of 9, to remove the coked crude benzene from the top of the tower. For light components, the bottom of the tower is put into the crude benzene weight removal tower ④ for negative pressure distillation. High boilers such as toluene, 2-methylthiophene, 3-methylthiophene, benzene, and toluene components are extracted from the top of the tower, and the top materials are sent to the crude benzene separation tower for negative pressure distillation. The control pressure is 35 KPa, and the top temperature 45°C, bottom temperature 76°C, reflux ratio of 3, benzene fraction is extracted from the top of the tower, and 2-methylthiophene, 3-methylthiophene, and toluene fraction are extracted from the bottom of the tower.

[0040] The fractions of 2-methylthiophene, 3-methylth...

Embodiment 3

[0047] The coked crude benzene is preheated to 100°C and enters the crude benzene light removal tower. The light removal tower is an atmospheric distillation with a top temperature of 60°C, a bottom temperature of 105°C and a reflux ratio of 10 to remove coked crude benzene from the top of the tower. For light component, the distillate extracted from the bottom of the tower is put into the crude benzene weight removal tower for negative pressure distillation. High boilers such as benzene and xylene, 2-methylthiophene, 3-methylthiophene, benzene, and toluene components are extracted from the top of the tower, and 2-methylthiophene, 3-methylthiophene, and benzene , The toluene component enters the crude benzene separation tower, and is distilled under negative pressure. The control pressure is 40 KPa, the top temperature is 50°C, the bottom temperature is 80°C, and the reflux ratio is 4. The benzene fraction is extracted from the top of the tower, and 2-methyl is extracted fr...

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Abstract

The invention discloses a method for extracting 2-methylthiophene and 3-methylthiophene with coking crude benzol. The method comprises a coking crude benzol fraction cutting unit, a 2-methylthiophene and 3-methylthiophene refining unit, and a solvent regeneration unit. According to the method, as cutting is conducted on crude benzol fraction, refining extraction is conducted on a fraction section rich in 2-methylthiophene and 3-methylthiophene, and 2-methylthiophene and 3-methylthiophene are obtained. As a solvent used in the method can be recycled after being regenerated, the cost is saved; energy consumption is reduced through material heat exchange; the method is advanced in technological flow; no wastes are generated in the whole production process; the environmental pollution problem does not exist; the energy is saved; and the environment is protected.

Description

technical field [0001] The invention relates to the field of chemical purification, in particular to a method for refining and extracting 2-methylthiophene and 3-methylthiophene enriched fractions by using coked crude benzene as a raw material and cutting the fractions. Background technique [0002] 2-methylthiophene, 3-methylthiophene, also known as methylthiophene, is a heterocyclic compound, light yellow or colorless transparent liquid, insoluble in water, soluble in ethanol, ether, and benzene, 2-methylthiophene Thiophene and 3-methylthiophene are important intermediates in organic synthesis, mainly used to prepare the reactants of the herbicide thiophene, the starting reagents for the preparation of dithioesters and the intermediates for the synthesis of thienothiopyrans, and can also be used for the preparation of Homopolymers, dopants, photochromic materials, optical recording media and thermally stable photoresponsive materials, organic synthesis and pharmaceutical i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D333/08
Inventor 杨辉秦国栋张建梅王坤张玉涵王萌
Owner WEIFANG YUANLI CHEM